Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 3983:811ec3d0833b
7097053: G1: assert(da ? referent->is_oop() : referent->is_oop_or_null()) failed: referenceProcessor.cpp:1054
Summary: During remembered set scanning, the reference processor could discover a reference object whose referent was in the process of being copied and so may not be completely initialized. Do not perform reference discovery during remembered set scanning.
Reviewed-by: tonyp, ysr
| author | johnc |
|---|---|
| date | Mon, 03 Oct 2011 12:49:53 -0700 |
| parents | 273b46400613 |
| children | 65a8ff39a6da |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "code/icBuffer.hpp" | |
| 27 #include "gc_implementation/g1/bufferingOopClosure.hpp" | |
| 28 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
| 29 #include "gc_implementation/g1/concurrentG1RefineThread.hpp" | |
| 30 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
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31 #include "gc_implementation/g1/g1AllocRegion.inline.hpp" |
| 1972 | 32 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
| 33 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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34 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
| 1972 | 35 #include "gc_implementation/g1/g1MarkSweep.hpp" |
| 36 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
| 37 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
| 38 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
| 39 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
| 40 #include "gc_implementation/g1/vm_operations_g1.hpp" | |
| 41 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
| 42 #include "memory/gcLocker.inline.hpp" | |
| 43 #include "memory/genOopClosures.inline.hpp" | |
| 44 #include "memory/generationSpec.hpp" | |
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45 #include "memory/referenceProcessor.hpp" |
| 1972 | 46 #include "oops/oop.inline.hpp" |
| 47 #include "oops/oop.pcgc.inline.hpp" | |
| 48 #include "runtime/aprofiler.hpp" | |
| 49 #include "runtime/vmThread.hpp" | |
| 342 | 50 |
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51 size_t G1CollectedHeap::_humongous_object_threshold_in_words = 0; |
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52 |
| 342 | 53 // turn it on so that the contents of the young list (scan-only / |
| 54 // to-be-collected) are printed at "strategic" points before / during | |
| 55 // / after the collection --- this is useful for debugging | |
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56 #define YOUNG_LIST_VERBOSE 0 |
| 342 | 57 // CURRENT STATUS |
| 58 // This file is under construction. Search for "FIXME". | |
| 59 | |
| 60 // INVARIANTS/NOTES | |
| 61 // | |
| 62 // All allocation activity covered by the G1CollectedHeap interface is | |
| 1973 | 63 // serialized by acquiring the HeapLock. This happens in mem_allocate |
| 64 // and allocate_new_tlab, which are the "entry" points to the | |
| 65 // allocation code from the rest of the JVM. (Note that this does not | |
| 66 // apply to TLAB allocation, which is not part of this interface: it | |
| 67 // is done by clients of this interface.) | |
| 342 | 68 |
| 69 // Local to this file. | |
| 70 | |
| 71 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
| 72 SuspendibleThreadSet* _sts; | |
| 73 G1RemSet* _g1rs; | |
| 74 ConcurrentG1Refine* _cg1r; | |
| 75 bool _concurrent; | |
| 76 public: | |
| 77 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
| 78 G1RemSet* g1rs, | |
| 79 ConcurrentG1Refine* cg1r) : | |
| 80 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
| 81 {} | |
| 82 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 1705 | 83 bool oops_into_cset = _g1rs->concurrentRefineOneCard(card_ptr, worker_i, false); |
| 84 // This path is executed by the concurrent refine or mutator threads, | |
| 85 // concurrently, and so we do not care if card_ptr contains references | |
| 86 // that point into the collection set. | |
| 87 assert(!oops_into_cset, "should be"); | |
| 88 | |
| 342 | 89 if (_concurrent && _sts->should_yield()) { |
| 90 // Caller will actually yield. | |
| 91 return false; | |
| 92 } | |
| 93 // Otherwise, we finished successfully; return true. | |
| 94 return true; | |
| 95 } | |
| 96 void set_concurrent(bool b) { _concurrent = b; } | |
| 97 }; | |
| 98 | |
| 99 | |
| 100 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 101 int _calls; | |
| 102 G1CollectedHeap* _g1h; | |
| 103 CardTableModRefBS* _ctbs; | |
| 104 int _histo[256]; | |
| 105 public: | |
| 106 ClearLoggedCardTableEntryClosure() : | |
| 107 _calls(0) | |
| 108 { | |
| 109 _g1h = G1CollectedHeap::heap(); | |
| 110 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 111 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
| 112 } | |
| 113 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 114 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 115 _calls++; | |
| 116 unsigned char* ujb = (unsigned char*)card_ptr; | |
| 117 int ind = (int)(*ujb); | |
| 118 _histo[ind]++; | |
| 119 *card_ptr = -1; | |
| 120 } | |
| 121 return true; | |
| 122 } | |
| 123 int calls() { return _calls; } | |
| 124 void print_histo() { | |
| 125 gclog_or_tty->print_cr("Card table value histogram:"); | |
| 126 for (int i = 0; i < 256; i++) { | |
| 127 if (_histo[i] != 0) { | |
| 128 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
| 129 } | |
| 130 } | |
| 131 } | |
| 132 }; | |
| 133 | |
| 134 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 135 int _calls; | |
| 136 G1CollectedHeap* _g1h; | |
| 137 CardTableModRefBS* _ctbs; | |
| 138 public: | |
| 139 RedirtyLoggedCardTableEntryClosure() : | |
| 140 _calls(0) | |
| 141 { | |
| 142 _g1h = G1CollectedHeap::heap(); | |
| 143 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 144 } | |
| 145 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 146 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 147 _calls++; | |
| 148 *card_ptr = 0; | |
| 149 } | |
| 150 return true; | |
| 151 } | |
| 152 int calls() { return _calls; } | |
| 153 }; | |
| 154 | |
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155 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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156 public: |
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157 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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158 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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159 return true; |
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160 } |
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161 }; |
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162 |
| 342 | 163 YoungList::YoungList(G1CollectedHeap* g1h) |
| 164 : _g1h(g1h), _head(NULL), | |
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165 _length(0), |
| 342 | 166 _last_sampled_rs_lengths(0), |
| 545 | 167 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) |
| 342 | 168 { |
| 169 guarantee( check_list_empty(false), "just making sure..." ); | |
| 170 } | |
| 171 | |
| 172 void YoungList::push_region(HeapRegion *hr) { | |
| 173 assert(!hr->is_young(), "should not already be young"); | |
| 174 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
| 175 | |
| 176 hr->set_next_young_region(_head); | |
| 177 _head = hr; | |
| 178 | |
| 179 hr->set_young(); | |
| 180 double yg_surv_rate = _g1h->g1_policy()->predict_yg_surv_rate((int)_length); | |
| 181 ++_length; | |
| 182 } | |
| 183 | |
| 184 void YoungList::add_survivor_region(HeapRegion* hr) { | |
| 545 | 185 assert(hr->is_survivor(), "should be flagged as survivor region"); |
| 342 | 186 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
| 187 | |
| 188 hr->set_next_young_region(_survivor_head); | |
| 189 if (_survivor_head == NULL) { | |
| 545 | 190 _survivor_tail = hr; |
| 342 | 191 } |
| 192 _survivor_head = hr; | |
| 193 | |
| 194 ++_survivor_length; | |
| 195 } | |
| 196 | |
| 197 void YoungList::empty_list(HeapRegion* list) { | |
| 198 while (list != NULL) { | |
| 199 HeapRegion* next = list->get_next_young_region(); | |
| 200 list->set_next_young_region(NULL); | |
| 201 list->uninstall_surv_rate_group(); | |
| 202 list->set_not_young(); | |
| 203 list = next; | |
| 204 } | |
| 205 } | |
| 206 | |
| 207 void YoungList::empty_list() { | |
| 208 assert(check_list_well_formed(), "young list should be well formed"); | |
| 209 | |
| 210 empty_list(_head); | |
| 211 _head = NULL; | |
| 212 _length = 0; | |
| 213 | |
| 214 empty_list(_survivor_head); | |
| 215 _survivor_head = NULL; | |
| 545 | 216 _survivor_tail = NULL; |
| 342 | 217 _survivor_length = 0; |
| 218 | |
| 219 _last_sampled_rs_lengths = 0; | |
| 220 | |
| 221 assert(check_list_empty(false), "just making sure..."); | |
| 222 } | |
| 223 | |
| 224 bool YoungList::check_list_well_formed() { | |
| 225 bool ret = true; | |
| 226 | |
| 227 size_t length = 0; | |
| 228 HeapRegion* curr = _head; | |
| 229 HeapRegion* last = NULL; | |
| 230 while (curr != NULL) { | |
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231 if (!curr->is_young()) { |
| 342 | 232 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " |
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233 "incorrectly tagged (y: %d, surv: %d)", |
| 342 | 234 curr->bottom(), curr->end(), |
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235 curr->is_young(), curr->is_survivor()); |
| 342 | 236 ret = false; |
| 237 } | |
| 238 ++length; | |
| 239 last = curr; | |
| 240 curr = curr->get_next_young_region(); | |
| 241 } | |
| 242 ret = ret && (length == _length); | |
| 243 | |
| 244 if (!ret) { | |
| 245 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
| 246 gclog_or_tty->print_cr("### list has %d entries, _length is %d", | |
| 247 length, _length); | |
| 248 } | |
| 249 | |
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250 return ret; |
| 342 | 251 } |
| 252 | |
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253 bool YoungList::check_list_empty(bool check_sample) { |
| 342 | 254 bool ret = true; |
| 255 | |
| 256 if (_length != 0) { | |
| 257 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %d", | |
| 258 _length); | |
| 259 ret = false; | |
| 260 } | |
| 261 if (check_sample && _last_sampled_rs_lengths != 0) { | |
| 262 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
| 263 ret = false; | |
| 264 } | |
| 265 if (_head != NULL) { | |
| 266 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
| 267 ret = false; | |
| 268 } | |
| 269 if (!ret) { | |
| 270 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
| 271 } | |
| 272 | |
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273 return ret; |
| 342 | 274 } |
| 275 | |
| 276 void | |
| 277 YoungList::rs_length_sampling_init() { | |
| 278 _sampled_rs_lengths = 0; | |
| 279 _curr = _head; | |
| 280 } | |
| 281 | |
| 282 bool | |
| 283 YoungList::rs_length_sampling_more() { | |
| 284 return _curr != NULL; | |
| 285 } | |
| 286 | |
| 287 void | |
| 288 YoungList::rs_length_sampling_next() { | |
| 289 assert( _curr != NULL, "invariant" ); | |
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290 size_t rs_length = _curr->rem_set()->occupied(); |
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291 |
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292 _sampled_rs_lengths += rs_length; |
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293 |
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294 // The current region may not yet have been added to the |
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295 // incremental collection set (it gets added when it is |
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296 // retired as the current allocation region). |
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297 if (_curr->in_collection_set()) { |
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298 // Update the collection set policy information for this region |
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299 _g1h->g1_policy()->update_incremental_cset_info(_curr, rs_length); |
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300 } |
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301 |
| 342 | 302 _curr = _curr->get_next_young_region(); |
| 303 if (_curr == NULL) { | |
| 304 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
| 305 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
| 306 } | |
| 307 } | |
| 308 | |
| 309 void | |
| 310 YoungList::reset_auxilary_lists() { | |
| 311 guarantee( is_empty(), "young list should be empty" ); | |
| 312 assert(check_list_well_formed(), "young list should be well formed"); | |
| 313 | |
| 314 // Add survivor regions to SurvRateGroup. | |
| 315 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
| 545 | 316 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
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317 |
| 342 | 318 for (HeapRegion* curr = _survivor_head; |
| 319 curr != NULL; | |
| 320 curr = curr->get_next_young_region()) { | |
| 321 _g1h->g1_policy()->set_region_survivors(curr); | |
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322 |
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323 // The region is a non-empty survivor so let's add it to |
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324 // the incremental collection set for the next evacuation |
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325 // pause. |
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326 _g1h->g1_policy()->add_region_to_incremental_cset_rhs(curr); |
| 342 | 327 } |
| 328 _g1h->g1_policy()->note_stop_adding_survivor_regions(); | |
| 329 | |
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330 _head = _survivor_head; |
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331 _length = _survivor_length; |
| 342 | 332 if (_survivor_head != NULL) { |
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333 assert(_survivor_tail != NULL, "cause it shouldn't be"); |
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334 assert(_survivor_length > 0, "invariant"); |
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335 _survivor_tail->set_next_young_region(NULL); |
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336 } |
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337 |
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338 // Don't clear the survivor list handles until the start of |
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339 // the next evacuation pause - we need it in order to re-tag |
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340 // the survivor regions from this evacuation pause as 'young' |
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341 // at the start of the next. |
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342 |
| 545 | 343 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
| 342 | 344 |
| 345 assert(check_list_well_formed(), "young list should be well formed"); | |
| 346 } | |
| 347 | |
| 348 void YoungList::print() { | |
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349 HeapRegion* lists[] = {_head, _survivor_head}; |
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350 const char* names[] = {"YOUNG", "SURVIVOR"}; |
| 342 | 351 |
| 352 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
| 353 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
| 354 HeapRegion *curr = lists[list]; | |
| 355 if (curr == NULL) | |
| 356 gclog_or_tty->print_cr(" empty"); | |
| 357 while (curr != NULL) { | |
| 358 gclog_or_tty->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " | |
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359 "age: %4d, y: %d, surv: %d", |
| 342 | 360 curr->bottom(), curr->end(), |
| 361 curr->top(), | |
| 362 curr->prev_top_at_mark_start(), | |
| 363 curr->next_top_at_mark_start(), | |
| 364 curr->top_at_conc_mark_count(), | |
| 365 curr->age_in_surv_rate_group_cond(), | |
| 366 curr->is_young(), | |
| 367 curr->is_survivor()); | |
| 368 curr = curr->get_next_young_region(); | |
| 369 } | |
| 370 } | |
| 371 | |
| 372 gclog_or_tty->print_cr(""); | |
| 373 } | |
| 374 | |
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375 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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376 { |
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377 // Claim the right to put the region on the dirty cards region list |
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378 // by installing a self pointer. |
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379 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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380 if (next == NULL) { |
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381 HeapRegion* res = (HeapRegion*) |
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382 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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383 NULL); |
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384 if (res == NULL) { |
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385 HeapRegion* head; |
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386 do { |
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387 // Put the region to the dirty cards region list. |
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388 head = _dirty_cards_region_list; |
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389 next = (HeapRegion*) |
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390 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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391 if (next == head) { |
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392 assert(hr->get_next_dirty_cards_region() == hr, |
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393 "hr->get_next_dirty_cards_region() != hr"); |
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394 if (next == NULL) { |
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395 // The last region in the list points to itself. |
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396 hr->set_next_dirty_cards_region(hr); |
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397 } else { |
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398 hr->set_next_dirty_cards_region(next); |
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399 } |
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400 } |
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401 } while (next != head); |
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402 } |
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403 } |
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404 } |
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405 |
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406 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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407 { |
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408 HeapRegion* head; |
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409 HeapRegion* hr; |
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410 do { |
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411 head = _dirty_cards_region_list; |
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412 if (head == NULL) { |
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413 return NULL; |
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414 } |
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415 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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416 if (head == new_head) { |
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417 // The last region. |
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418 new_head = NULL; |
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419 } |
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420 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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421 head); |
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422 } while (hr != head); |
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423 assert(hr != NULL, "invariant"); |
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424 hr->set_next_dirty_cards_region(NULL); |
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425 return hr; |
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426 } |
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427 |
| 342 | 428 void G1CollectedHeap::stop_conc_gc_threads() { |
| 794 | 429 _cg1r->stop(); |
| 342 | 430 _cmThread->stop(); |
| 431 } | |
| 432 | |
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433 #ifdef ASSERT |
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434 // A region is added to the collection set as it is retired |
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435 // so an address p can point to a region which will be in the |
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436 // collection set but has not yet been retired. This method |
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437 // therefore is only accurate during a GC pause after all |
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438 // regions have been retired. It is used for debugging |
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439 // to check if an nmethod has references to objects that can |
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440 // be move during a partial collection. Though it can be |
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441 // inaccurate, it is sufficient for G1 because the conservative |
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442 // implementation of is_scavengable() for G1 will indicate that |
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443 // all nmethods must be scanned during a partial collection. |
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444 bool G1CollectedHeap::is_in_partial_collection(const void* p) { |
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445 HeapRegion* hr = heap_region_containing(p); |
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446 return hr != NULL && hr->in_collection_set(); |
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447 } |
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448 #endif |
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449 |
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450 // Returns true if the reference points to an object that |
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451 // can move in an incremental collecction. |
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452 bool G1CollectedHeap::is_scavengable(const void* p) { |
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453 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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454 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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455 HeapRegion* hr = heap_region_containing(p); |
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456 if (hr == NULL) { |
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457 // perm gen (or null) |
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458 return false; |
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459 } else { |
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460 return !hr->isHumongous(); |
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461 } |
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462 } |
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463 |
| 342 | 464 void G1CollectedHeap::check_ct_logs_at_safepoint() { |
| 465 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 466 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
| 467 | |
| 468 // Count the dirty cards at the start. | |
| 469 CountNonCleanMemRegionClosure count1(this); | |
| 470 ct_bs->mod_card_iterate(&count1); | |
| 471 int orig_count = count1.n(); | |
| 472 | |
| 473 // First clear the logged cards. | |
| 474 ClearLoggedCardTableEntryClosure clear; | |
| 475 dcqs.set_closure(&clear); | |
| 476 dcqs.apply_closure_to_all_completed_buffers(); | |
| 477 dcqs.iterate_closure_all_threads(false); | |
| 478 clear.print_histo(); | |
| 479 | |
| 480 // Now ensure that there's no dirty cards. | |
| 481 CountNonCleanMemRegionClosure count2(this); | |
| 482 ct_bs->mod_card_iterate(&count2); | |
| 483 if (count2.n() != 0) { | |
| 484 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
| 485 count2.n(), orig_count); | |
| 486 } | |
| 487 guarantee(count2.n() == 0, "Card table should be clean."); | |
| 488 | |
| 489 RedirtyLoggedCardTableEntryClosure redirty; | |
| 490 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
| 491 dcqs.apply_closure_to_all_completed_buffers(); | |
| 492 dcqs.iterate_closure_all_threads(false); | |
| 493 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
| 494 clear.calls(), orig_count); | |
| 495 guarantee(redirty.calls() == clear.calls(), | |
| 496 "Or else mechanism is broken."); | |
| 497 | |
| 498 CountNonCleanMemRegionClosure count3(this); | |
| 499 ct_bs->mod_card_iterate(&count3); | |
| 500 if (count3.n() != orig_count) { | |
| 501 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
| 502 orig_count, count3.n()); | |
| 503 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
| 504 } | |
| 505 | |
| 506 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 507 } | |
| 508 | |
| 509 // Private class members. | |
| 510 | |
| 511 G1CollectedHeap* G1CollectedHeap::_g1h; | |
| 512 | |
| 513 // Private methods. | |
| 514 | |
| 2152 | 515 HeapRegion* |
| 2361 | 516 G1CollectedHeap::new_region_try_secondary_free_list() { |
| 2152 | 517 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
| 518 while (!_secondary_free_list.is_empty() || free_regions_coming()) { | |
| 519 if (!_secondary_free_list.is_empty()) { | |
| 520 if (G1ConcRegionFreeingVerbose) { | |
| 521 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 522 "secondary_free_list has "SIZE_FORMAT" entries", | |
| 523 _secondary_free_list.length()); | |
| 524 } | |
| 525 // It looks as if there are free regions available on the | |
| 526 // secondary_free_list. Let's move them to the free_list and try | |
| 527 // again to allocate from it. | |
| 528 append_secondary_free_list(); | |
| 529 | |
| 530 assert(!_free_list.is_empty(), "if the secondary_free_list was not " | |
| 531 "empty we should have moved at least one entry to the free_list"); | |
| 532 HeapRegion* res = _free_list.remove_head(); | |
| 533 if (G1ConcRegionFreeingVerbose) { | |
| 534 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 535 "allocated "HR_FORMAT" from secondary_free_list", | |
| 536 HR_FORMAT_PARAMS(res)); | |
| 537 } | |
| 538 return res; | |
| 539 } | |
| 540 | |
| 541 // Wait here until we get notifed either when (a) there are no | |
| 542 // more free regions coming or (b) some regions have been moved on | |
| 543 // the secondary_free_list. | |
| 544 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
| 545 } | |
| 546 | |
| 547 if (G1ConcRegionFreeingVerbose) { | |
| 548 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 549 "could not allocate from secondary_free_list"); | |
| 550 } | |
| 551 return NULL; | |
| 552 } | |
| 553 | |
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554 HeapRegion* G1CollectedHeap::new_region(size_t word_size, bool do_expand) { |
| 2152 | 555 assert(!isHumongous(word_size) || |
| 556 word_size <= (size_t) HeapRegion::GrainWords, | |
| 557 "the only time we use this to allocate a humongous region is " | |
| 558 "when we are allocating a single humongous region"); | |
| 559 | |
| 560 HeapRegion* res; | |
| 561 if (G1StressConcRegionFreeing) { | |
| 562 if (!_secondary_free_list.is_empty()) { | |
| 563 if (G1ConcRegionFreeingVerbose) { | |
| 564 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 565 "forced to look at the secondary_free_list"); | |
| 566 } | |
| 2361 | 567 res = new_region_try_secondary_free_list(); |
| 2152 | 568 if (res != NULL) { |
| 569 return res; | |
| 570 } | |
| 571 } | |
| 572 } | |
| 573 res = _free_list.remove_head_or_null(); | |
| 574 if (res == NULL) { | |
| 575 if (G1ConcRegionFreeingVerbose) { | |
| 576 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
| 577 "res == NULL, trying the secondary_free_list"); | |
| 578 } | |
| 2361 | 579 res = new_region_try_secondary_free_list(); |
| 2152 | 580 } |
| 342 | 581 if (res == NULL && do_expand) { |
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582 ergo_verbose1(ErgoHeapSizing, |
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583 "attempt heap expansion", |
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584 ergo_format_reason("region allocation request failed") |
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585 ergo_format_byte("allocation request"), |
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586 word_size * HeapWordSize); |
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587 if (expand(word_size * HeapWordSize)) { |
| 3766 | 588 // Even though the heap was expanded, it might not have reached |
| 589 // the desired size. So, we cannot assume that the allocation | |
| 590 // will succeed. | |
| 591 res = _free_list.remove_head_or_null(); | |
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592 } |
| 342 | 593 } |
| 594 return res; | |
| 595 } | |
| 596 | |
| 3766 | 597 size_t G1CollectedHeap::humongous_obj_allocate_find_first(size_t num_regions, |
| 598 size_t word_size) { | |
| 2361 | 599 assert(isHumongous(word_size), "word_size should be humongous"); |
| 600 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
| 601 | |
| 3766 | 602 size_t first = G1_NULL_HRS_INDEX; |
| 2152 | 603 if (num_regions == 1) { |
| 604 // Only one region to allocate, no need to go through the slower | |
| 605 // path. The caller will attempt the expasion if this fails, so | |
| 606 // let's not try to expand here too. | |
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607 HeapRegion* hr = new_region(word_size, false /* do_expand */); |
| 2152 | 608 if (hr != NULL) { |
| 609 first = hr->hrs_index(); | |
| 610 } else { | |
| 3766 | 611 first = G1_NULL_HRS_INDEX; |
| 2152 | 612 } |
| 613 } else { | |
| 614 // We can't allocate humongous regions while cleanupComplete() is | |
| 615 // running, since some of the regions we find to be empty might not | |
| 616 // yet be added to the free list and it is not straightforward to | |
| 617 // know which list they are on so that we can remove them. Note | |
| 618 // that we only need to do this if we need to allocate more than | |
| 619 // one region to satisfy the current humongous allocation | |
| 620 // request. If we are only allocating one region we use the common | |
| 621 // region allocation code (see above). | |
| 622 wait_while_free_regions_coming(); | |
| 2361 | 623 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 624 |
| 625 if (free_regions() >= num_regions) { | |
| 3766 | 626 first = _hrs.find_contiguous(num_regions); |
| 627 if (first != G1_NULL_HRS_INDEX) { | |
| 628 for (size_t i = first; i < first + num_regions; ++i) { | |
| 629 HeapRegion* hr = region_at(i); | |
| 2152 | 630 assert(hr->is_empty(), "sanity"); |
| 2361 | 631 assert(is_on_master_free_list(hr), "sanity"); |
| 2152 | 632 hr->set_pending_removal(true); |
| 633 } | |
| 634 _free_list.remove_all_pending(num_regions); | |
| 635 } | |
| 636 } | |
| 637 } | |
| 638 return first; | |
| 639 } | |
| 640 | |
| 2361 | 641 HeapWord* |
| 3766 | 642 G1CollectedHeap::humongous_obj_allocate_initialize_regions(size_t first, |
| 2361 | 643 size_t num_regions, |
| 644 size_t word_size) { | |
| 3766 | 645 assert(first != G1_NULL_HRS_INDEX, "pre-condition"); |
| 2361 | 646 assert(isHumongous(word_size), "word_size should be humongous"); |
| 647 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
| 648 | |
| 649 // Index of last region in the series + 1. | |
| 3766 | 650 size_t last = first + num_regions; |
| 2361 | 651 |
| 652 // We need to initialize the region(s) we just discovered. This is | |
| 653 // a bit tricky given that it can happen concurrently with | |
| 654 // refinement threads refining cards on these regions and | |
| 655 // potentially wanting to refine the BOT as they are scanning | |
| 656 // those cards (this can happen shortly after a cleanup; see CR | |
| 657 // 6991377). So we have to set up the region(s) carefully and in | |
| 658 // a specific order. | |
| 659 | |
| 660 // The word size sum of all the regions we will allocate. | |
| 661 size_t word_size_sum = num_regions * HeapRegion::GrainWords; | |
| 662 assert(word_size <= word_size_sum, "sanity"); | |
| 663 | |
| 664 // This will be the "starts humongous" region. | |
| 3766 | 665 HeapRegion* first_hr = region_at(first); |
| 2361 | 666 // The header of the new object will be placed at the bottom of |
| 667 // the first region. | |
| 668 HeapWord* new_obj = first_hr->bottom(); | |
| 669 // This will be the new end of the first region in the series that | |
| 670 // should also match the end of the last region in the seriers. | |
| 671 HeapWord* new_end = new_obj + word_size_sum; | |
| 672 // This will be the new top of the first region that will reflect | |
| 673 // this allocation. | |
| 674 HeapWord* new_top = new_obj + word_size; | |
| 675 | |
| 676 // First, we need to zero the header of the space that we will be | |
| 677 // allocating. When we update top further down, some refinement | |
| 678 // threads might try to scan the region. By zeroing the header we | |
| 679 // ensure that any thread that will try to scan the region will | |
| 680 // come across the zero klass word and bail out. | |
| 681 // | |
| 682 // NOTE: It would not have been correct to have used | |
| 683 // CollectedHeap::fill_with_object() and make the space look like | |
| 684 // an int array. The thread that is doing the allocation will | |
| 685 // later update the object header to a potentially different array | |
| 686 // type and, for a very short period of time, the klass and length | |
| 687 // fields will be inconsistent. This could cause a refinement | |
| 688 // thread to calculate the object size incorrectly. | |
| 689 Copy::fill_to_words(new_obj, oopDesc::header_size(), 0); | |
| 690 | |
| 691 // We will set up the first region as "starts humongous". This | |
| 692 // will also update the BOT covering all the regions to reflect | |
| 693 // that there is a single object that starts at the bottom of the | |
| 694 // first region. | |
| 695 first_hr->set_startsHumongous(new_top, new_end); | |
| 696 | |
| 697 // Then, if there are any, we will set up the "continues | |
| 698 // humongous" regions. | |
| 699 HeapRegion* hr = NULL; | |
| 3766 | 700 for (size_t i = first + 1; i < last; ++i) { |
| 701 hr = region_at(i); | |
| 2361 | 702 hr->set_continuesHumongous(first_hr); |
| 703 } | |
| 704 // If we have "continues humongous" regions (hr != NULL), then the | |
| 705 // end of the last one should match new_end. | |
| 706 assert(hr == NULL || hr->end() == new_end, "sanity"); | |
| 707 | |
| 708 // Up to this point no concurrent thread would have been able to | |
| 709 // do any scanning on any region in this series. All the top | |
| 710 // fields still point to bottom, so the intersection between | |
| 711 // [bottom,top] and [card_start,card_end] will be empty. Before we | |
| 712 // update the top fields, we'll do a storestore to make sure that | |
| 713 // no thread sees the update to top before the zeroing of the | |
| 714 // object header and the BOT initialization. | |
| 715 OrderAccess::storestore(); | |
| 716 | |
| 717 // Now that the BOT and the object header have been initialized, | |
| 718 // we can update top of the "starts humongous" region. | |
| 719 assert(first_hr->bottom() < new_top && new_top <= first_hr->end(), | |
| 720 "new_top should be in this region"); | |
| 721 first_hr->set_top(new_top); | |
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722 if (_hr_printer.is_active()) { |
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723 HeapWord* bottom = first_hr->bottom(); |
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724 HeapWord* end = first_hr->orig_end(); |
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725 if ((first + 1) == last) { |
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726 // the series has a single humongous region |
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727 _hr_printer.alloc(G1HRPrinter::SingleHumongous, first_hr, new_top); |
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728 } else { |
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729 // the series has more than one humongous regions |
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730 _hr_printer.alloc(G1HRPrinter::StartsHumongous, first_hr, end); |
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731 } |
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732 } |
| 2361 | 733 |
| 734 // Now, we will update the top fields of the "continues humongous" | |
| 735 // regions. The reason we need to do this is that, otherwise, | |
| 736 // these regions would look empty and this will confuse parts of | |
| 737 // G1. For example, the code that looks for a consecutive number | |
| 738 // of empty regions will consider them empty and try to | |
| 739 // re-allocate them. We can extend is_empty() to also include | |
| 740 // !continuesHumongous(), but it is easier to just update the top | |
| 741 // fields here. The way we set top for all regions (i.e., top == | |
| 742 // end for all regions but the last one, top == new_top for the | |
| 743 // last one) is actually used when we will free up the humongous | |
| 744 // region in free_humongous_region(). | |
| 745 hr = NULL; | |
| 3766 | 746 for (size_t i = first + 1; i < last; ++i) { |
| 747 hr = region_at(i); | |
| 2361 | 748 if ((i + 1) == last) { |
| 749 // last continues humongous region | |
| 750 assert(hr->bottom() < new_top && new_top <= hr->end(), | |
| 751 "new_top should fall on this region"); | |
| 752 hr->set_top(new_top); | |
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753 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, new_top); |
| 2361 | 754 } else { |
| 755 // not last one | |
| 756 assert(new_top > hr->end(), "new_top should be above this region"); | |
| 757 hr->set_top(hr->end()); | |
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758 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, hr->end()); |
| 2361 | 759 } |
| 760 } | |
| 761 // If we have continues humongous regions (hr != NULL), then the | |
| 762 // end of the last one should match new_end and its top should | |
| 763 // match new_top. | |
| 764 assert(hr == NULL || | |
| 765 (hr->end() == new_end && hr->top() == new_top), "sanity"); | |
| 766 | |
| 767 assert(first_hr->used() == word_size * HeapWordSize, "invariant"); | |
| 768 _summary_bytes_used += first_hr->used(); | |
| 769 _humongous_set.add(first_hr); | |
| 770 | |
| 771 return new_obj; | |
| 772 } | |
| 773 | |
| 342 | 774 // If could fit into free regions w/o expansion, try. |
| 775 // Otherwise, if can expand, do so. | |
| 776 // Otherwise, if using ex regions might help, try with ex given back. | |
| 1973 | 777 HeapWord* G1CollectedHeap::humongous_obj_allocate(size_t word_size) { |
| 2152 | 778 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
| 779 | |
| 780 verify_region_sets_optional(); | |
| 342 | 781 |
| 782 size_t num_regions = | |
| 1973 | 783 round_to(word_size, HeapRegion::GrainWords) / HeapRegion::GrainWords; |
| 342 | 784 size_t x_size = expansion_regions(); |
| 3766 | 785 size_t fs = _hrs.free_suffix(); |
| 786 size_t first = humongous_obj_allocate_find_first(num_regions, word_size); | |
| 787 if (first == G1_NULL_HRS_INDEX) { | |
| 2152 | 788 // The only thing we can do now is attempt expansion. |
| 342 | 789 if (fs + x_size >= num_regions) { |
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790 // If the number of regions we're trying to allocate for this |
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791 // object is at most the number of regions in the free suffix, |
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792 // then the call to humongous_obj_allocate_find_first() above |
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793 // should have succeeded and we wouldn't be here. |
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794 // |
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795 // We should only be trying to expand when the free suffix is |
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796 // not sufficient for the object _and_ we have some expansion |
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797 // room available. |
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798 assert(num_regions > fs, "earlier allocation should have succeeded"); |
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799 |
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800 ergo_verbose1(ErgoHeapSizing, |
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801 "attempt heap expansion", |
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802 ergo_format_reason("humongous allocation request failed") |
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803 ergo_format_byte("allocation request"), |
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804 word_size * HeapWordSize); |
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805 if (expand((num_regions - fs) * HeapRegion::GrainBytes)) { |
| 3766 | 806 // Even though the heap was expanded, it might not have |
| 807 // reached the desired size. So, we cannot assume that the | |
| 808 // allocation will succeed. | |
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809 first = humongous_obj_allocate_find_first(num_regions, word_size); |
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810 } |
| 2152 | 811 } |
| 812 } | |
| 813 | |
| 2361 | 814 HeapWord* result = NULL; |
| 3766 | 815 if (first != G1_NULL_HRS_INDEX) { |
| 2361 | 816 result = |
| 817 humongous_obj_allocate_initialize_regions(first, num_regions, word_size); | |
| 818 assert(result != NULL, "it should always return a valid result"); | |
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819 |
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820 // A successful humongous object allocation changes the used space |
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821 // information of the old generation so we need to recalculate the |
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822 // sizes and update the jstat counters here. |
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823 g1mm()->update_sizes(); |
| 2152 | 824 } |
| 825 | |
| 826 verify_region_sets_optional(); | |
| 2361 | 827 |
| 828 return result; | |
| 342 | 829 } |
| 830 | |
| 1973 | 831 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t word_size) { |
| 832 assert_heap_not_locked_and_not_at_safepoint(); | |
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833 assert(!isHumongous(word_size), "we do not allow humongous TLABs"); |
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834 |
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835 unsigned int dummy_gc_count_before; |
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836 return attempt_allocation(word_size, &dummy_gc_count_before); |
| 342 | 837 } |
| 838 | |
| 839 HeapWord* | |
| 840 G1CollectedHeap::mem_allocate(size_t word_size, | |
| 1973 | 841 bool* gc_overhead_limit_was_exceeded) { |
| 842 assert_heap_not_locked_and_not_at_safepoint(); | |
| 342 | 843 |
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844 // Loop until the allocation is satisified, or unsatisfied after GC. |
| 1973 | 845 for (int try_count = 1; /* we'll return */; try_count += 1) { |
| 846 unsigned int gc_count_before; | |
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847 |
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848 HeapWord* result = NULL; |
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849 if (!isHumongous(word_size)) { |
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850 result = attempt_allocation(word_size, &gc_count_before); |
|
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851 } else { |
|
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852 result = attempt_allocation_humongous(word_size, &gc_count_before); |
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853 } |
|
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|
854 if (result != NULL) { |
|
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|
855 return result; |
| 342 | 856 } |
| 857 | |
| 858 // Create the garbage collection operation... | |
| 1973 | 859 VM_G1CollectForAllocation op(gc_count_before, word_size); |
| 342 | 860 // ...and get the VM thread to execute it. |
| 861 VMThread::execute(&op); | |
| 1973 | 862 |
| 863 if (op.prologue_succeeded() && op.pause_succeeded()) { | |
| 864 // If the operation was successful we'll return the result even | |
| 865 // if it is NULL. If the allocation attempt failed immediately | |
| 866 // after a Full GC, it's unlikely we'll be able to allocate now. | |
| 867 HeapWord* result = op.result(); | |
| 868 if (result != NULL && !isHumongous(word_size)) { | |
| 869 // Allocations that take place on VM operations do not do any | |
| 870 // card dirtying and we have to do it here. We only have to do | |
| 871 // this for non-humongous allocations, though. | |
| 872 dirty_young_block(result, word_size); | |
| 873 } | |
| 342 | 874 return result; |
| 1973 | 875 } else { |
| 876 assert(op.result() == NULL, | |
| 877 "the result should be NULL if the VM op did not succeed"); | |
| 342 | 878 } |
| 879 | |
| 880 // Give a warning if we seem to be looping forever. | |
| 881 if ((QueuedAllocationWarningCount > 0) && | |
| 882 (try_count % QueuedAllocationWarningCount == 0)) { | |
| 1973 | 883 warning("G1CollectedHeap::mem_allocate retries %d times", try_count); |
| 342 | 884 } |
| 885 } | |
| 1973 | 886 |
| 887 ShouldNotReachHere(); | |
|
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888 return NULL; |
| 342 | 889 } |
| 890 | |
|
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891 HeapWord* G1CollectedHeap::attempt_allocation_slow(size_t word_size, |
|
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892 unsigned int *gc_count_before_ret) { |
|
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893 // Make sure you read the note in attempt_allocation_humongous(). |
|
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|
894 |
|
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|
895 assert_heap_not_locked_and_not_at_safepoint(); |
|
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896 assert(!isHumongous(word_size), "attempt_allocation_slow() should not " |
|
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897 "be called for humongous allocation requests"); |
|
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|
898 |
|
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|
899 // We should only get here after the first-level allocation attempt |
|
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|
900 // (attempt_allocation()) failed to allocate. |
|
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|
901 |
|
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|
902 // We will loop until a) we manage to successfully perform the |
|
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903 // allocation or b) we successfully schedule a collection which |
|
abdfc822206f
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|
904 // fails to perform the allocation. b) is the only case when we'll |
|
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|
905 // return NULL. |
|
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|
906 HeapWord* result = NULL; |
|
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|
907 for (int try_count = 1; /* we'll return */; try_count += 1) { |
|
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|
908 bool should_try_gc; |
|
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|
909 unsigned int gc_count_before; |
|
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|
910 |
|
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|
911 { |
|
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|
912 MutexLockerEx x(Heap_lock); |
|
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|
913 |
|
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|
914 result = _mutator_alloc_region.attempt_allocation_locked(word_size, |
|
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|
915 false /* bot_updates */); |
|
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|
916 if (result != NULL) { |
|
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|
917 return result; |
|
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|
918 } |
|
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|
919 |
|
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|
920 // If we reach here, attempt_allocation_locked() above failed to |
|
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|
921 // allocate a new region. So the mutator alloc region should be NULL. |
|
abdfc822206f
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|
922 assert(_mutator_alloc_region.get() == NULL, "only way to get here"); |
|
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|
923 |
|
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|
924 if (GC_locker::is_active_and_needs_gc()) { |
|
abdfc822206f
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|
925 if (g1_policy()->can_expand_young_list()) { |
|
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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parents:
3886
diff
changeset
|
926 // No need for an ergo verbose message here, |
|
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
927 // can_expand_young_list() does this when it returns true. |
|
2433
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|
928 result = _mutator_alloc_region.attempt_allocation_force(word_size, |
|
abdfc822206f
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|
929 false /* bot_updates */); |
|
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|
930 if (result != NULL) { |
|
abdfc822206f
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parents:
2432
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|
931 return result; |
|
abdfc822206f
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parents:
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|
932 } |
|
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|
933 } |
|
abdfc822206f
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parents:
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|
934 should_try_gc = false; |
|
abdfc822206f
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|
935 } else { |
|
abdfc822206f
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|
936 // Read the GC count while still holding the Heap_lock. |
|
abdfc822206f
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|
937 gc_count_before = SharedHeap::heap()->total_collections(); |
|
abdfc822206f
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|
938 should_try_gc = true; |
|
abdfc822206f
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|
939 } |
|
abdfc822206f
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parents:
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|
940 } |
|
abdfc822206f
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|
941 |
|
abdfc822206f
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changeset
|
942 if (should_try_gc) { |
|
abdfc822206f
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|
943 bool succeeded; |
|
abdfc822206f
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parents:
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|
944 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
|
abdfc822206f
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|
945 if (result != NULL) { |
|
abdfc822206f
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parents:
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changeset
|
946 assert(succeeded, "only way to get back a non-NULL result"); |
|
abdfc822206f
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parents:
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diff
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|
947 return result; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
948 } |
|
abdfc822206f
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parents:
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diff
changeset
|
949 |
|
abdfc822206f
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parents:
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diff
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|
950 if (succeeded) { |
|
abdfc822206f
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parents:
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diff
changeset
|
951 // If we get here we successfully scheduled a collection which |
|
abdfc822206f
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parents:
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|
952 // failed to allocate. No point in trying to allocate |
|
abdfc822206f
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parents:
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changeset
|
953 // further. We'll just return NULL. |
|
abdfc822206f
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|
954 MutexLockerEx x(Heap_lock); |
|
abdfc822206f
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|
955 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
956 return NULL; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
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|
957 } |
|
abdfc822206f
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parents:
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diff
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|
958 } else { |
|
abdfc822206f
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|
959 GC_locker::stall_until_clear(); |
|
abdfc822206f
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|
960 } |
|
abdfc822206f
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tonyp
parents:
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diff
changeset
|
961 |
|
abdfc822206f
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parents:
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diff
changeset
|
962 // We can reach here if we were unsuccessul in scheduling a |
|
abdfc822206f
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diff
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|
963 // collection (because another thread beat us to it) or if we were |
|
abdfc822206f
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diff
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|
964 // stalled due to the GC locker. In either can we should retry the |
|
abdfc822206f
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2432
diff
changeset
|
965 // allocation attempt in case another thread successfully |
|
abdfc822206f
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diff
changeset
|
966 // performed a collection and reclaimed enough space. We do the |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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diff
changeset
|
967 // first attempt (without holding the Heap_lock) here and the |
|
abdfc822206f
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tonyp
parents:
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diff
changeset
|
968 // follow-on attempt will be at the start of the next loop |
|
abdfc822206f
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|
969 // iteration (after taking the Heap_lock). |
|
abdfc822206f
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|
970 result = _mutator_alloc_region.attempt_allocation(word_size, |
|
abdfc822206f
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parents:
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diff
changeset
|
971 false /* bot_updates */); |
|
abdfc822206f
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parents:
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diff
changeset
|
972 if (result != NULL ){ |
|
abdfc822206f
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parents:
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diff
changeset
|
973 return result; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
974 } |
|
abdfc822206f
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diff
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|
975 |
|
abdfc822206f
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diff
changeset
|
976 // Give a warning if we seem to be looping forever. |
|
abdfc822206f
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tonyp
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changeset
|
977 if ((QueuedAllocationWarningCount > 0) && |
|
abdfc822206f
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diff
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|
978 (try_count % QueuedAllocationWarningCount == 0)) { |
|
abdfc822206f
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diff
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|
979 warning("G1CollectedHeap::attempt_allocation_slow() " |
|
abdfc822206f
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|
980 "retries %d times", try_count); |
|
abdfc822206f
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|
981 } |
|
abdfc822206f
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tonyp
parents:
2432
diff
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|
982 } |
|
abdfc822206f
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tonyp
parents:
2432
diff
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|
983 |
|
abdfc822206f
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tonyp
parents:
2432
diff
changeset
|
984 ShouldNotReachHere(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
985 return NULL; |
|
abdfc822206f
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tonyp
parents:
2432
diff
changeset
|
986 } |
|
abdfc822206f
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tonyp
parents:
2432
diff
changeset
|
987 |
|
abdfc822206f
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2432
diff
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|
988 HeapWord* G1CollectedHeap::attempt_allocation_humongous(size_t word_size, |
|
abdfc822206f
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|
989 unsigned int * gc_count_before_ret) { |
|
abdfc822206f
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2432
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|
990 // The structure of this method has a lot of similarities to |
|
abdfc822206f
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tonyp
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2432
diff
changeset
|
991 // attempt_allocation_slow(). The reason these two were not merged |
|
abdfc822206f
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tonyp
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2432
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|
992 // into a single one is that such a method would require several "if |
|
abdfc822206f
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2432
diff
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|
993 // allocation is not humongous do this, otherwise do that" |
|
abdfc822206f
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2432
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changeset
|
994 // conditional paths which would obscure its flow. In fact, an early |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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|
995 // version of this code did use a unified method which was harder to |
|
abdfc822206f
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tonyp
parents:
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diff
changeset
|
996 // follow and, as a result, it had subtle bugs that were hard to |
|
abdfc822206f
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tonyp
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2432
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changeset
|
997 // track down. So keeping these two methods separate allows each to |
|
abdfc822206f
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2432
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|
998 // be more readable. It will be good to keep these two in sync as |
|
abdfc822206f
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diff
changeset
|
999 // much as possible. |
|
abdfc822206f
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1000 |
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1001 assert_heap_not_locked_and_not_at_safepoint(); |
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1002 assert(isHumongous(word_size), "attempt_allocation_humongous() " |
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1003 "should only be called for humongous allocations"); |
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1004 |
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1005 // We will loop until a) we manage to successfully perform the |
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1006 // allocation or b) we successfully schedule a collection which |
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1007 // fails to perform the allocation. b) is the only case when we'll |
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1008 // return NULL. |
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1009 HeapWord* result = NULL; |
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1010 for (int try_count = 1; /* we'll return */; try_count += 1) { |
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1011 bool should_try_gc; |
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1012 unsigned int gc_count_before; |
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1013 |
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1014 { |
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1015 MutexLockerEx x(Heap_lock); |
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1016 |
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1017 // Given that humongous objects are not allocated in young |
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1018 // regions, we'll first try to do the allocation without doing a |
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1019 // collection hoping that there's enough space in the heap. |
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1020 result = humongous_obj_allocate(word_size); |
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1021 if (result != NULL) { |
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1022 return result; |
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1023 } |
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1024 |
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1025 if (GC_locker::is_active_and_needs_gc()) { |
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1026 should_try_gc = false; |
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1027 } else { |
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1028 // Read the GC count while still holding the Heap_lock. |
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1029 gc_count_before = SharedHeap::heap()->total_collections(); |
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1030 should_try_gc = true; |
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1031 } |
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1032 } |
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1033 |
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1034 if (should_try_gc) { |
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1035 // If we failed to allocate the humongous object, we should try to |
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1036 // do a collection pause (if we're allowed) in case it reclaims |
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1037 // enough space for the allocation to succeed after the pause. |
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1038 |
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1039 bool succeeded; |
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1040 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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1041 if (result != NULL) { |
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1042 assert(succeeded, "only way to get back a non-NULL result"); |
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1043 return result; |
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1044 } |
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1045 |
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1046 if (succeeded) { |
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1047 // If we get here we successfully scheduled a collection which |
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1048 // failed to allocate. No point in trying to allocate |
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1049 // further. We'll just return NULL. |
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1050 MutexLockerEx x(Heap_lock); |
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1051 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
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1052 return NULL; |
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1053 } |
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1054 } else { |
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1055 GC_locker::stall_until_clear(); |
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1056 } |
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1057 |
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1058 // We can reach here if we were unsuccessul in scheduling a |
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1059 // collection (because another thread beat us to it) or if we were |
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1060 // stalled due to the GC locker. In either can we should retry the |
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1061 // allocation attempt in case another thread successfully |
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1062 // performed a collection and reclaimed enough space. Give a |
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1063 // warning if we seem to be looping forever. |
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1064 |
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1065 if ((QueuedAllocationWarningCount > 0) && |
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1066 (try_count % QueuedAllocationWarningCount == 0)) { |
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1067 warning("G1CollectedHeap::attempt_allocation_humongous() " |
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1068 "retries %d times", try_count); |
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1069 } |
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1070 } |
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1071 |
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1072 ShouldNotReachHere(); |
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1073 return NULL; |
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1074 } |
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1075 |
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1076 HeapWord* G1CollectedHeap::attempt_allocation_at_safepoint(size_t word_size, |
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1077 bool expect_null_mutator_alloc_region) { |
| 2152 | 1078 assert_at_safepoint(true /* should_be_vm_thread */); |
|
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1079 assert(_mutator_alloc_region.get() == NULL || |
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1080 !expect_null_mutator_alloc_region, |
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1081 "the current alloc region was unexpectedly found to be non-NULL"); |
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1082 |
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1083 if (!isHumongous(word_size)) { |
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1084 return _mutator_alloc_region.attempt_allocation_locked(word_size, |
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1085 false /* bot_updates */); |
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1086 } else { |
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1087 return humongous_obj_allocate(word_size); |
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1088 } |
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1089 |
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1090 ShouldNotReachHere(); |
| 342 | 1091 } |
| 1092 | |
| 1093 class PostMCRemSetClearClosure: public HeapRegionClosure { | |
| 1094 ModRefBarrierSet* _mr_bs; | |
| 1095 public: | |
| 1096 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 1097 bool doHeapRegion(HeapRegion* r) { | |
| 1098 r->reset_gc_time_stamp(); | |
| 1099 if (r->continuesHumongous()) | |
| 1100 return false; | |
| 1101 HeapRegionRemSet* hrrs = r->rem_set(); | |
| 1102 if (hrrs != NULL) hrrs->clear(); | |
| 1103 // You might think here that we could clear just the cards | |
| 1104 // corresponding to the used region. But no: if we leave a dirty card | |
| 1105 // in a region we might allocate into, then it would prevent that card | |
| 1106 // from being enqueued, and cause it to be missed. | |
| 1107 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
| 1108 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
| 1109 return false; | |
| 1110 } | |
| 1111 }; | |
| 1112 | |
| 1113 | |
| 1114 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
| 1115 ModRefBarrierSet* _mr_bs; | |
| 1116 public: | |
| 1117 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 1118 bool doHeapRegion(HeapRegion* r) { | |
| 1119 if (r->continuesHumongous()) return false; | |
| 1120 if (r->used_region().word_size() != 0) { | |
| 1121 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
| 1122 } | |
| 1123 return false; | |
| 1124 } | |
| 1125 }; | |
| 1126 | |
|
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1127 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
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1128 G1CollectedHeap* _g1h; |
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1129 UpdateRSOopClosure _cl; |
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1130 int _worker_i; |
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1131 public: |
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1132 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
| 1861 | 1133 _cl(g1->g1_rem_set(), worker_i), |
|
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1134 _worker_i(worker_i), |
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1135 _g1h(g1) |
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1136 { } |
|
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1137 |
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1138 bool doHeapRegion(HeapRegion* r) { |
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1139 if (!r->continuesHumongous()) { |
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1140 _cl.set_from(r); |
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1141 r->oop_iterate(&_cl); |
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1142 } |
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1143 return false; |
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1144 } |
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1145 }; |
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1146 |
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1147 class ParRebuildRSTask: public AbstractGangTask { |
|
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1148 G1CollectedHeap* _g1; |
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1149 public: |
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1150 ParRebuildRSTask(G1CollectedHeap* g1) |
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1151 : AbstractGangTask("ParRebuildRSTask"), |
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1152 _g1(g1) |
|
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|
1153 { } |
|
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|
1154 |
|
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changeset
|
1155 void work(int i) { |
|
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|
1156 RebuildRSOutOfRegionClosure rebuild_rs(_g1, i); |
|
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|
1157 _g1->heap_region_par_iterate_chunked(&rebuild_rs, i, |
|
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|
1158 HeapRegion::RebuildRSClaimValue); |
|
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|
1159 } |
|
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|
1160 }; |
|
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|
1161 |
|
3778
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1162 class PostCompactionPrinterClosure: public HeapRegionClosure { |
|
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1163 private: |
|
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1164 G1HRPrinter* _hr_printer; |
|
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|
1165 public: |
|
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|
1166 bool doHeapRegion(HeapRegion* hr) { |
|
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1167 assert(!hr->is_young(), "not expecting to find young regions"); |
|
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1168 // We only generate output for non-empty regions. |
|
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1169 if (!hr->is_empty()) { |
|
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|
1170 if (!hr->isHumongous()) { |
|
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|
1171 _hr_printer->post_compaction(hr, G1HRPrinter::Old); |
|
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1172 } else if (hr->startsHumongous()) { |
|
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1173 if (hr->capacity() == (size_t) HeapRegion::GrainBytes) { |
|
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1174 // single humongous region |
|
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|
1175 _hr_printer->post_compaction(hr, G1HRPrinter::SingleHumongous); |
|
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1176 } else { |
|
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|
1177 _hr_printer->post_compaction(hr, G1HRPrinter::StartsHumongous); |
|
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|
1178 } |
|
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|
1179 } else { |
|
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|
1180 assert(hr->continuesHumongous(), "only way to get here"); |
|
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|
1181 _hr_printer->post_compaction(hr, G1HRPrinter::ContinuesHumongous); |
|
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1182 } |
|
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|
1183 } |
|
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|
1184 return false; |
|
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|
1185 } |
|
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|
1186 |
|
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|
1187 PostCompactionPrinterClosure(G1HRPrinter* hr_printer) |
|
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1188 : _hr_printer(hr_printer) { } |
|
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1189 }; |
|
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|
1190 |
| 1973 | 1191 bool G1CollectedHeap::do_collection(bool explicit_gc, |
|
1656
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|
1192 bool clear_all_soft_refs, |
| 342 | 1193 size_t word_size) { |
| 2152 | 1194 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1195 | |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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diff
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|
1196 if (GC_locker::check_active_before_gc()) { |
| 1973 | 1197 return false; |
|
1359
23b1b27ac76c
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parents:
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|
1198 } |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1313
diff
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|
1199 |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
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diff
changeset
|
1200 SvcGCMarker sgcm(SvcGCMarker::FULL); |
| 342 | 1201 ResourceMark rm; |
| 1202 | |
|
838
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|
1203 if (PrintHeapAtGC) { |
|
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|
1204 Universe::print_heap_before_gc(); |
|
0316eac49d5a
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|
1205 } |
|
0316eac49d5a
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|
1206 |
| 2152 | 1207 verify_region_sets_optional(); |
| 342 | 1208 |
|
1387
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|
1209 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
|
0bfd3fb24150
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|
1210 collector_policy()->should_clear_all_soft_refs(); |
|
0bfd3fb24150
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|
1211 |
|
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|
1212 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
|
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|
1213 |
| 342 | 1214 { |
| 1215 IsGCActiveMark x; | |
| 1216 | |
| 1217 // Timing | |
|
1656
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|
1218 bool system_gc = (gc_cause() == GCCause::_java_lang_system_gc); |
|
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|
1219 assert(!system_gc || explicit_gc, "invariant"); |
| 342 | 1220 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
| 1221 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
|
1656
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|
1222 TraceTime t(system_gc ? "Full GC (System.gc())" : "Full GC", |
|
1387
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diff
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|
1223 PrintGC, true, gclog_or_tty); |
| 342 | 1224 |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
1225 TraceCollectorStats tcs(g1mm()->full_collection_counters()); |
|
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
1226 TraceMemoryManagerStats tms(true /* fullGC */, gc_cause()); |
|
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
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1088
diff
changeset
|
1227 |
| 342 | 1228 double start = os::elapsedTime(); |
| 1229 g1_policy()->record_full_collection_start(); | |
| 1230 | |
| 2152 | 1231 wait_while_free_regions_coming(); |
| 2361 | 1232 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 1233 |
| 342 | 1234 gc_prologue(true); |
|
838
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diff
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|
1235 increment_total_collections(true /* full gc */); |
| 342 | 1236 |
| 1237 size_t g1h_prev_used = used(); | |
| 1238 assert(used() == recalculate_used(), "Should be equal"); | |
| 1239 | |
| 1240 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
| 1241 HandleMark hm; // Discard invalid handles created during verification | |
|
2433
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diff
changeset
|
1242 gclog_or_tty->print(" VerifyBeforeGC:"); |
| 342 | 1243 prepare_for_verify(); |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
changeset
|
1244 Universe::verify(/* allow dirty */ true, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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diff
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|
1245 /* silent */ false, |
|
6747fd0512e0
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|
1246 /* option */ VerifyOption_G1UsePrevMarking); |
|
6747fd0512e0
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changeset
|
1247 |
| 342 | 1248 } |
|
3869
7f776886a215
6810861: G1: support -XX:+{PrintClassHistogram,HeapDump}{Before,After}FullGC
ysr
parents:
3867
diff
changeset
|
1249 pre_full_gc_dump(); |
| 342 | 1250 |
| 1251 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
| 1252 | |
|
3979
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diff
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|
1253 // Disable discovery and empty the discovered lists |
|
4dfb2df418f2
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changeset
|
1254 // for the CM ref processor. |
|
4dfb2df418f2
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changeset
|
1255 ref_processor_cm()->disable_discovery(); |
|
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|
1256 ref_processor_cm()->abandon_partial_discovery(); |
|
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|
1257 ref_processor_cm()->verify_no_references_recorded(); |
| 342 | 1258 |
| 1259 // Abandon current iterations of concurrent marking and concurrent | |
| 1260 // refinement, if any are in progress. | |
| 1261 concurrent_mark()->abort(); | |
| 1262 | |
| 1263 // Make sure we'll choose a new allocation region afterwards. | |
|
2433
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changeset
|
1264 release_mutator_alloc_region(); |
| 636 | 1265 abandon_gc_alloc_regions(); |
| 1861 | 1266 g1_rem_set()->cleanupHRRS(); |
| 342 | 1267 tear_down_region_lists(); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
1268 |
|
3778
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|
1269 // We should call this after we retire any currently active alloc |
|
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|
1270 // regions so that all the ALLOC / RETIRE events are generated |
|
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|
1271 // before the start GC event. |
|
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changeset
|
1272 _hr_printer.start_gc(true /* full */, (size_t) total_collections()); |
|
5f6f2615433a
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|
1273 |
|
1394
1316cec51b4d
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diff
changeset
|
1274 // We may have added regions to the current incremental collection |
|
1316cec51b4d
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diff
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|
1275 // set between the last GC or pause and now. We need to clear the |
|
1316cec51b4d
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diff
changeset
|
1276 // incremental collection set and then start rebuilding it afresh |
|
1316cec51b4d
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diff
changeset
|
1277 // after this full GC. |
|
1316cec51b4d
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diff
changeset
|
1278 abandon_collection_set(g1_policy()->inc_cset_head()); |
|
1316cec51b4d
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diff
changeset
|
1279 g1_policy()->clear_incremental_cset(); |
|
1316cec51b4d
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diff
changeset
|
1280 g1_policy()->stop_incremental_cset_building(); |
|
1316cec51b4d
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johnc
parents:
1391
diff
changeset
|
1281 |
|
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
1282 empty_young_list(); |
|
ff53346271fe
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parents:
3830
diff
changeset
|
1283 g1_policy()->set_full_young_gcs(true); |
| 342 | 1284 |
|
3979
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diff
changeset
|
1285 // See the comments in g1CollectedHeap.hpp and |
|
4dfb2df418f2
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diff
changeset
|
1286 // G1CollectedHeap::ref_processing_init() about |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
1287 // how reference processing currently works in G1. |
|
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
1288 |
|
3979
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diff
changeset
|
1289 // Temporarily make discovery by the STW ref processor single threaded (non-MT). |
|
4dfb2df418f2
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diff
changeset
|
1290 ReferenceProcessorMTDiscoveryMutator stw_rp_disc_ser(ref_processor_stw(), false); |
|
4dfb2df418f2
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changeset
|
1291 |
|
4dfb2df418f2
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diff
changeset
|
1292 // Temporarily clear the STW ref processor's _is_alive_non_header field. |
|
4dfb2df418f2
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diff
changeset
|
1293 ReferenceProcessorIsAliveMutator stw_rp_is_alive_null(ref_processor_stw(), NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
1294 |
|
4dfb2df418f2
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diff
changeset
|
1295 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
|
4dfb2df418f2
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diff
changeset
|
1296 ref_processor_stw()->setup_policy(do_clear_all_soft_refs); |
|
4dfb2df418f2
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|
1297 |
| 342 | 1298 // Do collection work |
| 1299 { | |
| 1300 HandleMark hm; // Discard invalid handles created during gc | |
|
3979
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changeset
|
1301 G1MarkSweep::invoke_at_safepoint(ref_processor_stw(), do_clear_all_soft_refs); |
| 342 | 1302 } |
|
3979
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changeset
|
1303 |
| 2152 | 1304 assert(free_regions() == 0, "we should not have added any free regions"); |
| 342 | 1305 rebuild_region_lists(); |
| 1306 | |
| 1307 _summary_bytes_used = recalculate_used(); | |
| 1308 | |
|
3979
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changeset
|
1309 // Enqueue any discovered reference objects that have |
|
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1310 // not been removed from the discovered lists. |
|
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|
1311 ref_processor_stw()->enqueue_discovered_references(); |
| 342 | 1312 |
| 1313 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
| 1314 | |
|
1089
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|
1315 MemoryService::track_memory_usage(); |
|
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1316 |
| 342 | 1317 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
| 1318 HandleMark hm; // Discard invalid handles created during verification | |
| 1319 gclog_or_tty->print(" VerifyAfterGC:"); | |
|
637
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|
1320 prepare_for_verify(); |
|
3772
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|
1321 Universe::verify(/* allow dirty */ false, |
|
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1322 /* silent */ false, |
|
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|
1323 /* option */ VerifyOption_G1UsePrevMarking); |
|
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1324 |
| 342 | 1325 } |
|
3979
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1326 |
|
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1327 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
|
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|
1328 ref_processor_stw()->verify_no_references_recorded(); |
|
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1329 |
|
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|
1330 // Note: since we've just done a full GC, concurrent |
|
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1331 // marking is no longer active. Therefore we need not |
|
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1332 // re-enable reference discovery for the CM ref processor. |
|
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1333 // That will be done at the start of the next marking cycle. |
|
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|
1334 assert(!ref_processor_cm()->discovery_enabled(), "Postcondition"); |
|
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|
1335 ref_processor_cm()->verify_no_references_recorded(); |
| 342 | 1336 |
| 1337 reset_gc_time_stamp(); | |
| 1338 // Since everything potentially moved, we will clear all remembered | |
|
626
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1339 // sets, and clear all cards. Later we will rebuild remebered |
|
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1340 // sets. We will also reset the GC time stamps of the regions. |
| 342 | 1341 PostMCRemSetClearClosure rs_clear(mr_bs()); |
| 1342 heap_region_iterate(&rs_clear); | |
| 1343 | |
| 1344 // Resize the heap if necessary. | |
|
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|
1345 resize_if_necessary_after_full_collection(explicit_gc ? 0 : word_size); |
| 342 | 1346 |
|
3778
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|
1347 if (_hr_printer.is_active()) { |
|
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1348 // We should do this after we potentially resize the heap so |
|
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1349 // that all the COMMIT / UNCOMMIT events are generated before |
|
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1350 // the end GC event. |
|
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|
1351 |
|
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|
1352 PostCompactionPrinterClosure cl(hr_printer()); |
|
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|
1353 heap_region_iterate(&cl); |
|
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|
1354 |
|
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|
1355 _hr_printer.end_gc(true /* full */, (size_t) total_collections()); |
|
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1356 } |
|
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|
1357 |
| 342 | 1358 if (_cg1r->use_cache()) { |
| 1359 _cg1r->clear_and_record_card_counts(); | |
| 1360 _cg1r->clear_hot_cache(); | |
| 1361 } | |
| 1362 | |
|
626
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|
1363 // Rebuild remembered sets of all regions. |
|
1833
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|
1364 |
|
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|
1365 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
626
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1366 ParRebuildRSTask rebuild_rs_task(this); |
|
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1367 assert(check_heap_region_claim_values( |
|
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|
1368 HeapRegion::InitialClaimValue), "sanity check"); |
|
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|
1369 set_par_threads(workers()->total_workers()); |
|
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|
1370 workers()->run_task(&rebuild_rs_task); |
|
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|
1371 set_par_threads(0); |
|
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|
1372 assert(check_heap_region_claim_values( |
|
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|
1373 HeapRegion::RebuildRSClaimValue), "sanity check"); |
|
87fa6e083d82
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|
1374 reset_heap_region_claim_values(); |
|
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|
1375 } else { |
|
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|
1376 RebuildRSOutOfRegionClosure rebuild_rs(this); |
|
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|
1377 heap_region_iterate(&rebuild_rs); |
|
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|
1378 } |
|
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|
1379 |
| 342 | 1380 if (PrintGC) { |
| 1381 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); | |
| 1382 } | |
| 1383 | |
| 1384 if (true) { // FIXME | |
| 1385 // Ask the permanent generation to adjust size for full collections | |
| 1386 perm()->compute_new_size(); | |
| 1387 } | |
| 1388 | |
|
1394
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|
1389 // Start a new incremental collection set for the next pause |
|
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|
1390 assert(g1_policy()->collection_set() == NULL, "must be"); |
|
1316cec51b4d
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|
1391 g1_policy()->start_incremental_cset_building(); |
|
1316cec51b4d
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|
1392 |
|
1316cec51b4d
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|
1393 // Clear the _cset_fast_test bitmap in anticipation of adding |
|
1316cec51b4d
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|
1394 // regions to the incremental collection set for the next |
|
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|
1395 // evacuation pause. |
|
1316cec51b4d
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|
1396 clear_cset_fast_test(); |
|
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|
1397 |
|
2433
abdfc822206f
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|
1398 init_mutator_alloc_region(); |
|
abdfc822206f
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diff
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|
1399 |
| 342 | 1400 double end = os::elapsedTime(); |
| 1401 g1_policy()->record_full_collection_end(); | |
| 1402 | |
|
546
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6690928: Use spinning in combination with yields for workstealing termination.
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|
1403 #ifdef TRACESPINNING |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
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|
1404 ParallelTaskTerminator::print_termination_counts(); |
|
05c6d52fa7a9
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diff
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|
1405 #endif |
|
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|
1406 |
| 342 | 1407 gc_epilogue(true); |
| 1408 | |
| 794 | 1409 // Discard all rset updates |
| 1410 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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|
1411 assert(!G1DeferredRSUpdate |
|
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|
1412 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
| 342 | 1413 } |
| 1414 | |
|
3867
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|
1415 _young_list->reset_sampled_info(); |
|
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1416 // At this point there should be no regions in the |
|
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|
1417 // entire heap tagged as young. |
|
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|
1418 assert( check_young_list_empty(true /* check_heap */), |
|
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diff
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|
1419 "young list should be empty at this point"); |
|
838
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|
1420 |
|
1656
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|
1421 // Update the number of full collections that have been completed. |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
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diff
changeset
|
1422 increment_full_collections_completed(false /* concurrent */); |
|
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|
1423 |
| 3766 | 1424 _hrs.verify_optional(); |
| 2152 | 1425 verify_region_sets_optional(); |
| 1426 | |
|
838
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|
1427 if (PrintHeapAtGC) { |
|
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|
1428 Universe::print_heap_after_gc(); |
|
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|
1429 } |
|
3980
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|
1430 g1mm()->update_sizes(); |
|
3869
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|
1431 post_full_gc_dump(); |
| 1973 | 1432 |
| 1433 return true; | |
| 342 | 1434 } |
| 1435 | |
| 1436 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
| 1973 | 1437 // do_collection() will return whether it succeeded in performing |
| 1438 // the GC. Currently, there is no facility on the | |
| 1439 // do_full_collection() API to notify the caller than the collection | |
| 1440 // did not succeed (e.g., because it was locked out by the GC | |
| 1441 // locker). So, right now, we'll ignore the return value. | |
| 1442 bool dummy = do_collection(true, /* explicit_gc */ | |
| 1443 clear_all_soft_refs, | |
| 1444 0 /* word_size */); | |
| 342 | 1445 } |
| 1446 | |
| 1447 // This code is mostly copied from TenuredGeneration. | |
| 1448 void | |
| 1449 G1CollectedHeap:: | |
| 1450 resize_if_necessary_after_full_collection(size_t word_size) { | |
| 1451 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
| 1452 | |
| 1453 // Include the current allocation, if any, and bytes that will be | |
| 1454 // pre-allocated to support collections, as "used". | |
| 1455 const size_t used_after_gc = used(); | |
| 1456 const size_t capacity_after_gc = capacity(); | |
| 1457 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
| 1458 | |
|
1717
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|
1459 // This is enforced in arguments.cpp. |
|
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|
1460 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, |
|
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|
1461 "otherwise the code below doesn't make sense"); |
|
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|
1462 |
| 342 | 1463 // We don't have floating point command-line arguments |
|
1717
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|
1464 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100.0; |
| 342 | 1465 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
|
1717
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|
1466 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100.0; |
| 342 | 1467 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
| 1468 | |
|
1717
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|
1469 const size_t min_heap_size = collector_policy()->min_heap_byte_size(); |
|
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|
1470 const size_t max_heap_size = collector_policy()->max_heap_byte_size(); |
|
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|
1471 |
|
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|
1472 // We have to be careful here as these two calculations can overflow |
|
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|
1473 // 32-bit size_t's. |
|
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|
1474 double used_after_gc_d = (double) used_after_gc; |
|
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|
1475 double minimum_desired_capacity_d = used_after_gc_d / maximum_used_percentage; |
|
688c3755d7af
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|
1476 double maximum_desired_capacity_d = used_after_gc_d / minimum_used_percentage; |
|
688c3755d7af
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|
1477 |
|
688c3755d7af
6959014: G1: assert(minimum_desired_capacity <= maximum_desired_capacity) failed: sanity check
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|
1478 // Let's make sure that they are both under the max heap size, which |
|
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|
1479 // by default will make them fit into a size_t. |
|
688c3755d7af
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1480 double desired_capacity_upper_bound = (double) max_heap_size; |
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1481 minimum_desired_capacity_d = MIN2(minimum_desired_capacity_d, |
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1482 desired_capacity_upper_bound); |
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1483 maximum_desired_capacity_d = MIN2(maximum_desired_capacity_d, |
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1484 desired_capacity_upper_bound); |
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1485 |
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1486 // We can now safely turn them into size_t's. |
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1487 size_t minimum_desired_capacity = (size_t) minimum_desired_capacity_d; |
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1488 size_t maximum_desired_capacity = (size_t) maximum_desired_capacity_d; |
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1489 |
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1490 // This assert only makes sense here, before we adjust them |
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1491 // with respect to the min and max heap size. |
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1492 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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1493 err_msg("minimum_desired_capacity = "SIZE_FORMAT", " |
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1494 "maximum_desired_capacity = "SIZE_FORMAT, |
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1495 minimum_desired_capacity, maximum_desired_capacity)); |
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1496 |
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1497 // Should not be greater than the heap max size. No need to adjust |
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1498 // it with respect to the heap min size as it's a lower bound (i.e., |
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1499 // we'll try to make the capacity larger than it, not smaller). |
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1500 minimum_desired_capacity = MIN2(minimum_desired_capacity, max_heap_size); |
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1501 // Should not be less than the heap min size. No need to adjust it |
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1502 // with respect to the heap max size as it's an upper bound (i.e., |
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1503 // we'll try to make the capacity smaller than it, not greater). |
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1504 maximum_desired_capacity = MAX2(maximum_desired_capacity, min_heap_size); |
| 342 | 1505 |
|
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1506 if (capacity_after_gc < minimum_desired_capacity) { |
| 342 | 1507 // Don't expand unless it's significant |
| 1508 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
|
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1509 ergo_verbose4(ErgoHeapSizing, |
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1510 "attempt heap expansion", |
|
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1511 ergo_format_reason("capacity lower than " |
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1512 "min desired capacity after Full GC") |
|
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1513 ergo_format_byte("capacity") |
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1514 ergo_format_byte("occupancy") |
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1515 ergo_format_byte_perc("min desired capacity"), |
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1516 capacity_after_gc, used_after_gc, |
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1517 minimum_desired_capacity, (double) MinHeapFreeRatio); |
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1518 expand(expand_bytes); |
| 342 | 1519 |
| 1520 // No expansion, now see if we want to shrink | |
|
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1521 } else if (capacity_after_gc > maximum_desired_capacity) { |
| 342 | 1522 // Capacity too large, compute shrinking size |
| 1523 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
|
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1524 ergo_verbose4(ErgoHeapSizing, |
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1525 "attempt heap shrinking", |
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1526 ergo_format_reason("capacity higher than " |
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1527 "max desired capacity after Full GC") |
|
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1528 ergo_format_byte("capacity") |
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1529 ergo_format_byte("occupancy") |
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1530 ergo_format_byte_perc("max desired capacity"), |
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1531 capacity_after_gc, used_after_gc, |
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1532 maximum_desired_capacity, (double) MaxHeapFreeRatio); |
| 342 | 1533 shrink(shrink_bytes); |
| 1534 } | |
| 1535 } | |
| 1536 | |
| 1537 | |
| 1538 HeapWord* | |
| 1973 | 1539 G1CollectedHeap::satisfy_failed_allocation(size_t word_size, |
| 1540 bool* succeeded) { | |
| 2152 | 1541 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1973 | 1542 |
| 1543 *succeeded = true; | |
| 1544 // Let's attempt the allocation first. | |
|
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1545 HeapWord* result = |
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1546 attempt_allocation_at_safepoint(word_size, |
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1547 false /* expect_null_mutator_alloc_region */); |
| 1973 | 1548 if (result != NULL) { |
| 1549 assert(*succeeded, "sanity"); | |
| 1550 return result; | |
| 1551 } | |
| 342 | 1552 |
| 1553 // In a G1 heap, we're supposed to keep allocation from failing by | |
| 1554 // incremental pauses. Therefore, at least for now, we'll favor | |
| 1555 // expansion over collection. (This might change in the future if we can | |
| 1556 // do something smarter than full collection to satisfy a failed alloc.) | |
| 1557 result = expand_and_allocate(word_size); | |
| 1558 if (result != NULL) { | |
| 1973 | 1559 assert(*succeeded, "sanity"); |
| 342 | 1560 return result; |
| 1561 } | |
| 1562 | |
| 1973 | 1563 // Expansion didn't work, we'll try to do a Full GC. |
| 1564 bool gc_succeeded = do_collection(false, /* explicit_gc */ | |
| 1565 false, /* clear_all_soft_refs */ | |
| 1566 word_size); | |
| 1567 if (!gc_succeeded) { | |
| 1568 *succeeded = false; | |
| 1569 return NULL; | |
| 1570 } | |
| 1571 | |
| 1572 // Retry the allocation | |
| 1573 result = attempt_allocation_at_safepoint(word_size, | |
|
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1574 true /* expect_null_mutator_alloc_region */); |
| 342 | 1575 if (result != NULL) { |
| 1973 | 1576 assert(*succeeded, "sanity"); |
| 342 | 1577 return result; |
| 1578 } | |
| 1579 | |
| 1973 | 1580 // Then, try a Full GC that will collect all soft references. |
| 1581 gc_succeeded = do_collection(false, /* explicit_gc */ | |
| 1582 true, /* clear_all_soft_refs */ | |
| 1583 word_size); | |
| 1584 if (!gc_succeeded) { | |
| 1585 *succeeded = false; | |
| 1586 return NULL; | |
| 1587 } | |
| 1588 | |
| 1589 // Retry the allocation once more | |
| 1590 result = attempt_allocation_at_safepoint(word_size, | |
|
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1591 true /* expect_null_mutator_alloc_region */); |
| 342 | 1592 if (result != NULL) { |
| 1973 | 1593 assert(*succeeded, "sanity"); |
| 342 | 1594 return result; |
| 1595 } | |
| 1596 | |
|
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1597 assert(!collector_policy()->should_clear_all_soft_refs(), |
| 1973 | 1598 "Flag should have been handled and cleared prior to this point"); |
|
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1599 |
| 342 | 1600 // What else? We might try synchronous finalization later. If the total |
| 1601 // space available is large enough for the allocation, then a more | |
| 1602 // complete compaction phase than we've tried so far might be | |
| 1603 // appropriate. | |
| 1973 | 1604 assert(*succeeded, "sanity"); |
| 342 | 1605 return NULL; |
| 1606 } | |
| 1607 | |
| 1608 // Attempting to expand the heap sufficiently | |
| 1609 // to support an allocation of the given "word_size". If | |
| 1610 // successful, perform the allocation and return the address of the | |
| 1611 // allocated block, or else "NULL". | |
| 1612 | |
| 1613 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
| 2152 | 1614 assert_at_safepoint(true /* should_be_vm_thread */); |
| 1615 | |
| 1616 verify_region_sets_optional(); | |
| 1973 | 1617 |
|
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1618 size_t expand_bytes = MAX2(word_size * HeapWordSize, MinHeapDeltaBytes); |
|
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1619 ergo_verbose1(ErgoHeapSizing, |
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1620 "attempt heap expansion", |
|
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1621 ergo_format_reason("allocation request failed") |
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1622 ergo_format_byte("allocation request"), |
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1623 word_size * HeapWordSize); |
|
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1624 if (expand(expand_bytes)) { |
| 3766 | 1625 _hrs.verify_optional(); |
|
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1626 verify_region_sets_optional(); |
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1627 return attempt_allocation_at_safepoint(word_size, |
|
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1628 false /* expect_null_mutator_alloc_region */); |
|
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1629 } |
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1630 return NULL; |
| 342 | 1631 } |
| 1632 | |
| 3766 | 1633 void G1CollectedHeap::update_committed_space(HeapWord* old_end, |
| 1634 HeapWord* new_end) { | |
| 1635 assert(old_end != new_end, "don't call this otherwise"); | |
| 1636 assert((HeapWord*) _g1_storage.high() == new_end, "invariant"); | |
| 1637 | |
| 1638 // Update the committed mem region. | |
| 1639 _g1_committed.set_end(new_end); | |
| 1640 // Tell the card table about the update. | |
| 1641 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
| 1642 // Tell the BOT about the update. | |
| 1643 _bot_shared->resize(_g1_committed.word_size()); | |
| 1644 } | |
| 1645 | |
|
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1646 bool G1CollectedHeap::expand(size_t expand_bytes) { |
| 342 | 1647 size_t old_mem_size = _g1_storage.committed_size(); |
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1648 size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
| 342 | 1649 aligned_expand_bytes = align_size_up(aligned_expand_bytes, |
| 1650 HeapRegion::GrainBytes); | |
|
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1651 ergo_verbose2(ErgoHeapSizing, |
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1652 "expand the heap", |
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1653 ergo_format_byte("requested expansion amount") |
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1654 ergo_format_byte("attempted expansion amount"), |
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1655 expand_bytes, aligned_expand_bytes); |
|
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1656 |
| 3766 | 1657 // First commit the memory. |
| 1658 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
|
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1659 bool successful = _g1_storage.expand_by(aligned_expand_bytes); |
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1660 if (successful) { |
| 3766 | 1661 // Then propagate this update to the necessary data structures. |
| 1662 HeapWord* new_end = (HeapWord*) _g1_storage.high(); | |
| 1663 update_committed_space(old_end, new_end); | |
| 1664 | |
| 1665 FreeRegionList expansion_list("Local Expansion List"); | |
| 1666 MemRegion mr = _hrs.expand_by(old_end, new_end, &expansion_list); | |
| 1667 assert(mr.start() == old_end, "post-condition"); | |
| 1668 // mr might be a smaller region than what was requested if | |
| 1669 // expand_by() was unable to allocate the HeapRegion instances | |
| 1670 assert(mr.end() <= new_end, "post-condition"); | |
| 1671 | |
| 1672 size_t actual_expand_bytes = mr.byte_size(); | |
| 1673 assert(actual_expand_bytes <= aligned_expand_bytes, "post-condition"); | |
| 1674 assert(actual_expand_bytes == expansion_list.total_capacity_bytes(), | |
| 1675 "post-condition"); | |
| 1676 if (actual_expand_bytes < aligned_expand_bytes) { | |
| 1677 // We could not expand _hrs to the desired size. In this case we | |
| 1678 // need to shrink the committed space accordingly. | |
| 1679 assert(mr.end() < new_end, "invariant"); | |
| 1680 | |
| 1681 size_t diff_bytes = aligned_expand_bytes - actual_expand_bytes; | |
| 1682 // First uncommit the memory. | |
| 1683 _g1_storage.shrink_by(diff_bytes); | |
| 1684 // Then propagate this update to the necessary data structures. | |
| 1685 update_committed_space(new_end, mr.end()); | |
|
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1686 } |
| 3766 | 1687 _free_list.add_as_tail(&expansion_list); |
|
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1688 |
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1689 if (_hr_printer.is_active()) { |
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1690 HeapWord* curr = mr.start(); |
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1691 while (curr < mr.end()) { |
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1692 HeapWord* curr_end = curr + HeapRegion::GrainWords; |
|
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1693 _hr_printer.commit(curr, curr_end); |
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1694 curr = curr_end; |
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1695 } |
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1696 assert(curr == mr.end(), "post-condition"); |
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1697 } |
|
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1698 g1_policy()->record_new_heap_size(n_regions()); |
|
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1699 } else { |
|
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1700 ergo_verbose0(ErgoHeapSizing, |
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1701 "did not expand the heap", |
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1702 ergo_format_reason("heap expansion operation failed")); |
|
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1703 // The expansion of the virtual storage space was unsuccessful. |
|
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1704 // Let's see if it was because we ran out of swap. |
|
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1705 if (G1ExitOnExpansionFailure && |
|
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1706 _g1_storage.uncommitted_size() >= aligned_expand_bytes) { |
|
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1707 // We had head room... |
|
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1708 vm_exit_out_of_memory(aligned_expand_bytes, "G1 heap expansion"); |
| 342 | 1709 } |
| 1710 } | |
|
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1711 return successful; |
| 342 | 1712 } |
| 1713 | |
| 3766 | 1714 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) { |
| 342 | 1715 size_t old_mem_size = _g1_storage.committed_size(); |
| 1716 size_t aligned_shrink_bytes = | |
| 1717 ReservedSpace::page_align_size_down(shrink_bytes); | |
| 1718 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
| 1719 HeapRegion::GrainBytes); | |
| 1720 size_t num_regions_deleted = 0; | |
| 3766 | 1721 MemRegion mr = _hrs.shrink_by(aligned_shrink_bytes, &num_regions_deleted); |
| 1722 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
| 1723 assert(mr.end() == old_end, "post-condition"); | |
|
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1724 |
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1725 ergo_verbose3(ErgoHeapSizing, |
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1726 "shrink the heap", |
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1727 ergo_format_byte("requested shrinking amount") |
|
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1728 ergo_format_byte("aligned shrinking amount") |
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1729 ergo_format_byte("attempted shrinking amount"), |
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1730 shrink_bytes, aligned_shrink_bytes, mr.byte_size()); |
| 3766 | 1731 if (mr.byte_size() > 0) { |
|
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1732 if (_hr_printer.is_active()) { |
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1733 HeapWord* curr = mr.end(); |
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1734 while (curr > mr.start()) { |
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1735 HeapWord* curr_end = curr; |
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1736 curr -= HeapRegion::GrainWords; |
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1737 _hr_printer.uncommit(curr, curr_end); |
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1738 } |
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1739 assert(curr == mr.start(), "post-condition"); |
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1740 } |
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1741 |
| 342 | 1742 _g1_storage.shrink_by(mr.byte_size()); |
| 3766 | 1743 HeapWord* new_end = (HeapWord*) _g1_storage.high(); |
| 1744 assert(mr.start() == new_end, "post-condition"); | |
| 1745 | |
| 1746 _expansion_regions += num_regions_deleted; | |
| 1747 update_committed_space(old_end, new_end); | |
| 1748 HeapRegionRemSet::shrink_heap(n_regions()); | |
|
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1749 g1_policy()->record_new_heap_size(n_regions()); |
|
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1750 } else { |
|
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1751 ergo_verbose0(ErgoHeapSizing, |
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1752 "did not shrink the heap", |
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1753 ergo_format_reason("heap shrinking operation failed")); |
| 342 | 1754 } |
| 1755 } | |
| 1756 | |
| 1757 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
| 2152 | 1758 verify_region_sets_optional(); |
| 1759 | |
|
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1760 // We should only reach here at the end of a Full GC which means we |
|
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1761 // should not not be holding to any GC alloc regions. The method |
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1762 // below will make sure of that and do any remaining clean up. |
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1763 abandon_gc_alloc_regions(); |
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1764 |
| 2152 | 1765 // Instead of tearing down / rebuilding the free lists here, we |
| 1766 // could instead use the remove_all_pending() method on free_list to | |
| 1767 // remove only the ones that we need to remove. | |
| 342 | 1768 tear_down_region_lists(); // We will rebuild them in a moment. |
| 1769 shrink_helper(shrink_bytes); | |
| 1770 rebuild_region_lists(); | |
| 2152 | 1771 |
| 3766 | 1772 _hrs.verify_optional(); |
| 2152 | 1773 verify_region_sets_optional(); |
| 342 | 1774 } |
| 1775 | |
| 1776 // Public methods. | |
| 1777 | |
| 1778 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
| 1779 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 1780 #endif // _MSC_VER | |
| 1781 | |
| 1782 | |
| 1783 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
| 1784 SharedHeap(policy_), | |
| 1785 _g1_policy(policy_), | |
| 1111 | 1786 _dirty_card_queue_set(false), |
| 1705 | 1787 _into_cset_dirty_card_queue_set(false), |
|
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1788 _is_alive_closure_cm(this), |
|
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1789 _is_alive_closure_stw(this), |
|
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1790 _ref_processor_cm(NULL), |
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1791 _ref_processor_stw(NULL), |
| 342 | 1792 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), |
| 1793 _bot_shared(NULL), | |
| 1794 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
| 1795 _evac_failure_scan_stack(NULL) , | |
| 1796 _mark_in_progress(false), | |
| 2152 | 1797 _cg1r(NULL), _summary_bytes_used(0), |
|
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1798 _g1mm(NULL), |
| 342 | 1799 _refine_cte_cl(NULL), |
| 1800 _full_collection(false), | |
| 2152 | 1801 _free_list("Master Free List"), |
| 1802 _secondary_free_list("Secondary Free List"), | |
| 1803 _humongous_set("Master Humongous Set"), | |
| 1804 _free_regions_coming(false), | |
| 342 | 1805 _young_list(new YoungList(this)), |
| 1806 _gc_time_stamp(0), | |
|
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1807 _retained_old_gc_alloc_region(NULL), |
| 526 | 1808 _surviving_young_words(NULL), |
|
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1809 _full_collections_completed(0), |
| 526 | 1810 _in_cset_fast_test(NULL), |
|
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1811 _in_cset_fast_test_base(NULL), |
|
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1812 _dirty_cards_region_list(NULL) { |
| 342 | 1813 _g1h = this; // To catch bugs. |
| 1814 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
| 1815 vm_exit_during_initialization("Failed necessary allocation."); | |
| 1816 } | |
|
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1817 |
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1818 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1819 |
| 342 | 1820 int n_queues = MAX2((int)ParallelGCThreads, 1); |
| 1821 _task_queues = new RefToScanQueueSet(n_queues); | |
| 1822 | |
| 1823 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
| 1824 assert(n_rem_sets > 0, "Invariant."); | |
| 1825 | |
| 1826 HeapRegionRemSetIterator** iter_arr = | |
| 1827 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
| 1828 for (int i = 0; i < n_queues; i++) { | |
| 1829 iter_arr[i] = new HeapRegionRemSetIterator(); | |
| 1830 } | |
| 1831 _rem_set_iterator = iter_arr; | |
| 1832 | |
| 1833 for (int i = 0; i < n_queues; i++) { | |
| 1834 RefToScanQueue* q = new RefToScanQueue(); | |
| 1835 q->initialize(); | |
| 1836 _task_queues->register_queue(i, q); | |
| 1837 } | |
| 1838 | |
| 1839 guarantee(_task_queues != NULL, "task_queues allocation failure."); | |
| 1840 } | |
| 1841 | |
| 1842 jint G1CollectedHeap::initialize() { | |
| 1166 | 1843 CollectedHeap::pre_initialize(); |
| 342 | 1844 os::enable_vtime(); |
| 1845 | |
| 1846 // Necessary to satisfy locking discipline assertions. | |
| 1847 | |
| 1848 MutexLocker x(Heap_lock); | |
| 1849 | |
|
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1850 // We have to initialize the printer before committing the heap, as |
|
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1851 // it will be used then. |
|
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1852 _hr_printer.set_active(G1PrintHeapRegions); |
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1853 |
| 342 | 1854 // While there are no constraints in the GC code that HeapWordSize |
| 1855 // be any particular value, there are multiple other areas in the | |
| 1856 // system which believe this to be true (e.g. oop->object_size in some | |
| 1857 // cases incorrectly returns the size in wordSize units rather than | |
| 1858 // HeapWordSize). | |
| 1859 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
| 1860 | |
| 1861 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
| 1862 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
| 1863 | |
| 1864 // Ensure that the sizes are properly aligned. | |
| 1865 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1866 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1867 | |
| 1868 _cg1r = new ConcurrentG1Refine(); | |
| 1869 | |
| 1870 // Reserve the maximum. | |
| 1871 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
| 1872 // Includes the perm-gen. | |
|
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1873 |
|
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1874 // When compressed oops are enabled, the preferred heap base |
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1875 // is calculated by subtracting the requested size from the |
|
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1876 // 32Gb boundary and using the result as the base address for |
|
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1877 // heap reservation. If the requested size is not aligned to |
|
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1878 // HeapRegion::GrainBytes (i.e. the alignment that is passed |
|
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1879 // into the ReservedHeapSpace constructor) then the actual |
|
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1880 // base of the reserved heap may end up differing from the |
|
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1881 // address that was requested (i.e. the preferred heap base). |
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1882 // If this happens then we could end up using a non-optimal |
|
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1883 // compressed oops mode. |
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1884 |
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1885 // Since max_byte_size is aligned to the size of a heap region (checked |
|
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1886 // above), we also need to align the perm gen size as it might not be. |
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|
1887 const size_t total_reserved = max_byte_size + |
|
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|
1888 align_size_up(pgs->max_size(), HeapRegion::GrainBytes); |
|
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|
1889 Universe::check_alignment(total_reserved, HeapRegion::GrainBytes, "g1 heap and perm"); |
|
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1890 |
|
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1891 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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1892 |
|
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1893 ReservedHeapSpace heap_rs(total_reserved, HeapRegion::GrainBytes, |
|
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1894 UseLargePages, addr); |
|
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1895 |
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1896 if (UseCompressedOops) { |
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1897 if (addr != NULL && !heap_rs.is_reserved()) { |
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1898 // Failed to reserve at specified address - the requested memory |
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1899 // region is taken already, for example, by 'java' launcher. |
|
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1900 // Try again to reserver heap higher. |
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1901 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
|
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1902 |
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1903 ReservedHeapSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
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1904 UseLargePages, addr); |
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1905 |
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1906 if (addr != NULL && !heap_rs0.is_reserved()) { |
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1907 // Failed to reserve at specified address again - give up. |
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1908 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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1909 assert(addr == NULL, ""); |
|
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1910 |
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1911 ReservedHeapSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
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1912 UseLargePages, addr); |
|
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1913 heap_rs = heap_rs1; |
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1914 } else { |
|
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1915 heap_rs = heap_rs0; |
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1916 } |
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1917 } |
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1918 } |
| 342 | 1919 |
| 1920 if (!heap_rs.is_reserved()) { | |
| 1921 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
| 1922 return JNI_ENOMEM; | |
| 1923 } | |
| 1924 | |
| 1925 // It is important to do this in a way such that concurrent readers can't | |
| 1926 // temporarily think somethings in the heap. (I've actually seen this | |
| 1927 // happen in asserts: DLD.) | |
| 1928 _reserved.set_word_size(0); | |
| 1929 _reserved.set_start((HeapWord*)heap_rs.base()); | |
| 1930 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
| 1931 | |
| 1932 _expansion_regions = max_byte_size/HeapRegion::GrainBytes; | |
| 1933 | |
| 1934 // Create the gen rem set (and barrier set) for the entire reserved region. | |
| 1935 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
| 1936 set_barrier_set(rem_set()->bs()); | |
| 1937 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
| 1938 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
| 1939 } else { | |
| 1940 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
| 1941 return JNI_ENOMEM; | |
| 1942 } | |
| 1943 | |
| 1944 // Also create a G1 rem set. | |
| 1861 | 1945 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { |
| 1946 _g1_rem_set = new G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
| 342 | 1947 } else { |
| 1861 | 1948 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); |
| 1949 return JNI_ENOMEM; | |
| 342 | 1950 } |
| 1951 | |
| 1952 // Carve out the G1 part of the heap. | |
| 1953 | |
| 1954 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
| 1955 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
| 1956 g1_rs.size()/HeapWordSize); | |
| 1957 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
| 1958 | |
| 1959 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
| 1960 | |
| 1961 _g1_storage.initialize(g1_rs, 0); | |
| 1962 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
| 3766 | 1963 _hrs.initialize((HeapWord*) _g1_reserved.start(), |
| 1964 (HeapWord*) _g1_reserved.end(), | |
| 1965 _expansion_regions); | |
| 342 | 1966 |
|
807
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1967 // 6843694 - ensure that the maximum region index can fit |
|
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1968 // in the remembered set structures. |
|
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1969 const size_t max_region_idx = ((size_t)1 << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
|
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1970 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
|
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1971 |
|
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1972 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
|
942
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1973 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
|
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1974 guarantee((size_t) HeapRegion::CardsPerRegion < max_cards_per_region, |
|
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1975 "too many cards per region"); |
|
807
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|
1976 |
| 2152 | 1977 HeapRegionSet::set_unrealistically_long_length(max_regions() + 1); |
| 1978 | |
| 342 | 1979 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
| 1980 heap_word_size(init_byte_size)); | |
| 1981 | |
| 1982 _g1h = this; | |
| 1983 | |
|
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1984 _in_cset_fast_test_length = max_regions(); |
|
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1985 _in_cset_fast_test_base = NEW_C_HEAP_ARRAY(bool, _in_cset_fast_test_length); |
|
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|
1986 |
|
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|
1987 // We're biasing _in_cset_fast_test to avoid subtracting the |
|
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|
1988 // beginning of the heap every time we want to index; basically |
|
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|
1989 // it's the same with what we do with the card table. |
|
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|
1990 _in_cset_fast_test = _in_cset_fast_test_base - |
|
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|
1991 ((size_t) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
|
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|
1992 |
|
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|
1993 // Clear the _cset_fast_test bitmap in anticipation of adding |
|
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1994 // regions to the incremental collection set for the first |
|
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|
1995 // evacuation pause. |
|
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|
1996 clear_cset_fast_test(); |
|
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|
1997 |
| 342 | 1998 // Create the ConcurrentMark data structure and thread. |
| 1999 // (Must do this late, so that "max_regions" is defined.) | |
| 2000 _cm = new ConcurrentMark(heap_rs, (int) max_regions()); | |
| 2001 _cmThread = _cm->cmThread(); | |
| 2002 | |
| 2003 // Initialize the from_card cache structure of HeapRegionRemSet. | |
| 2004 HeapRegionRemSet::init_heap(max_regions()); | |
| 2005 | |
| 677 | 2006 // Now expand into the initial heap size. |
|
2188
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|
2007 if (!expand(init_byte_size)) { |
|
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|
2008 vm_exit_during_initialization("Failed to allocate initial heap."); |
|
c33825b68624
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|
2009 return JNI_ENOMEM; |
|
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|
2010 } |
| 342 | 2011 |
| 2012 // Perform any initialization actions delegated to the policy. | |
| 2013 g1_policy()->init(); | |
| 2014 | |
| 2015 g1_policy()->note_start_of_mark_thread(); | |
| 2016 | |
| 2017 _refine_cte_cl = | |
| 2018 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
| 2019 g1_rem_set(), | |
| 2020 concurrent_g1_refine()); | |
| 2021 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 2022 | |
| 2023 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
| 2024 SATB_Q_FL_lock, | |
| 1111 | 2025 G1SATBProcessCompletedThreshold, |
| 342 | 2026 Shared_SATB_Q_lock); |
| 794 | 2027 |
| 2028 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
| 2029 DirtyCardQ_FL_lock, | |
| 1111 | 2030 concurrent_g1_refine()->yellow_zone(), |
| 2031 concurrent_g1_refine()->red_zone(), | |
| 794 | 2032 Shared_DirtyCardQ_lock); |
| 2033 | |
|
616
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diff
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|
2034 if (G1DeferredRSUpdate) { |
|
4f360ec815ba
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diff
changeset
|
2035 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
|
4f360ec815ba
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iveresov
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|
2036 DirtyCardQ_FL_lock, |
| 1111 | 2037 -1, // never trigger processing |
| 2038 -1, // no limit on length | |
|
616
4f360ec815ba
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|
2039 Shared_DirtyCardQ_lock, |
|
4f360ec815ba
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diff
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|
2040 &JavaThread::dirty_card_queue_set()); |
|
4f360ec815ba
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diff
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|
2041 } |
| 1705 | 2042 |
| 2043 // Initialize the card queue set used to hold cards containing | |
| 2044 // references into the collection set. | |
| 2045 _into_cset_dirty_card_queue_set.initialize(DirtyCardQ_CBL_mon, | |
| 2046 DirtyCardQ_FL_lock, | |
| 2047 -1, // never trigger processing | |
| 2048 -1, // no limit on length | |
| 2049 Shared_DirtyCardQ_lock, | |
| 2050 &JavaThread::dirty_card_queue_set()); | |
| 2051 | |
| 342 | 2052 // In case we're keeping closure specialization stats, initialize those |
| 2053 // counts and that mechanism. | |
| 2054 SpecializationStats::clear(); | |
| 2055 | |
| 2056 // Do later initialization work for concurrent refinement. | |
| 2057 _cg1r->init(); | |
| 2058 | |
|
2433
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|
2059 // Here we allocate the dummy full region that is required by the |
|
abdfc822206f
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diff
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|
2060 // G1AllocRegion class. If we don't pass an address in the reserved |
|
abdfc822206f
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diff
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|
2061 // space here, lots of asserts fire. |
| 3766 | 2062 |
| 2063 HeapRegion* dummy_region = new_heap_region(0 /* index of bottom region */, | |
| 2064 _g1_reserved.start()); | |
|
2433
abdfc822206f
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diff
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|
2065 // We'll re-use the same region whether the alloc region will |
|
abdfc822206f
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diff
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|
2066 // require BOT updates or not and, if it doesn't, then a non-young |
|
abdfc822206f
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|
2067 // region will complain that it cannot support allocations without |
|
abdfc822206f
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|
2068 // BOT updates. So we'll tag the dummy region as young to avoid that. |
|
abdfc822206f
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|
2069 dummy_region->set_young(); |
|
abdfc822206f
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|
2070 // Make sure it's full. |
|
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|
2071 dummy_region->set_top(dummy_region->end()); |
|
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|
2072 G1AllocRegion::setup(this, dummy_region); |
|
abdfc822206f
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|
2073 |
|
abdfc822206f
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|
2074 init_mutator_alloc_region(); |
|
abdfc822206f
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|
2075 |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
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diff
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|
2076 // Do create of the monitoring and management support so that |
|
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
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diff
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|
2077 // values in the heap have been properly initialized. |
|
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
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3979
diff
changeset
|
2078 _g1mm = new G1MonitoringSupport(this); |
|
3289
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diff
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|
2079 |
| 342 | 2080 return JNI_OK; |
| 2081 } | |
| 2082 | |
| 2083 void G1CollectedHeap::ref_processing_init() { | |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
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|
2084 // Reference processing in G1 currently works as follows: |
|
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
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diff
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|
2085 // |
|
3979
4dfb2df418f2
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diff
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|
2086 // * There are two reference processor instances. One is |
|
4dfb2df418f2
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diff
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|
2087 // used to record and process discovered references |
|
4dfb2df418f2
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diff
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|
2088 // during concurrent marking; the other is used to |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
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|
2089 // record and process references during STW pauses |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
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|
2090 // (both full and incremental). |
|
4dfb2df418f2
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johnc
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diff
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|
2091 // * Both ref processors need to 'span' the entire heap as |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
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diff
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|
2092 // the regions in the collection set may be dotted around. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
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diff
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|
2093 // |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2094 // * For the concurrent marking ref processor: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
2095 // * Reference discovery is enabled at initial marking. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
2096 // * Reference discovery is disabled and the discovered |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
2097 // references processed etc during remarking. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
2098 // * Reference discovery is MT (see below). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
2099 // * Reference discovery requires a barrier (see below). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
2100 // * Reference processing may or may not be MT |
|
4dfb2df418f2
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diff
changeset
|
2101 // (depending on the value of ParallelRefProcEnabled |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
2102 // and ParallelGCThreads). |
|
4dfb2df418f2
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diff
changeset
|
2103 // * A full GC disables reference discovery by the CM |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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changeset
|
2104 // ref processor and abandons any entries on it's |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
2105 // discovered lists. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
2106 // |
|
4dfb2df418f2
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changeset
|
2107 // * For the STW processor: |
|
4dfb2df418f2
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changeset
|
2108 // * Non MT discovery is enabled at the start of a full GC. |
|
4dfb2df418f2
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|
2109 // * Processing and enqueueing during a full GC is non-MT. |
|
4dfb2df418f2
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|
2110 // * During a full GC, references are processed after marking. |
|
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|
2111 // |
|
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|
2112 // * Discovery (may or may not be MT) is enabled at the start |
|
4dfb2df418f2
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|
2113 // of an incremental evacuation pause. |
|
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|
2114 // * References are processed near the end of a STW evacuation pause. |
|
4dfb2df418f2
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|
2115 // * For both types of GC: |
|
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|
2116 // * Discovery is atomic - i.e. not concurrent. |
|
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|
2117 // * Reference discovery will not need a barrier. |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
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diff
changeset
|
2118 |
| 342 | 2119 SharedHeap::ref_processing_init(); |
| 2120 MemRegion mr = reserved_region(); | |
|
3979
4dfb2df418f2
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|
2121 |
|
4dfb2df418f2
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|
2122 // Concurrent Mark ref processor |
|
4dfb2df418f2
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|
2123 _ref_processor_cm = |
|
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
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2361
diff
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|
2124 new ReferenceProcessor(mr, // span |
|
3979
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|
2125 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
|
4dfb2df418f2
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diff
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|
2126 // mt processing |
|
4dfb2df418f2
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3973
diff
changeset
|
2127 (int) ParallelGCThreads, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
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|
2128 // degree of mt processing |
|
4dfb2df418f2
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3973
diff
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|
2129 (ParallelGCThreads > 1) || (ConcGCThreads > 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
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|
2130 // mt discovery |
|
4dfb2df418f2
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parents:
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diff
changeset
|
2131 (int) MAX2(ParallelGCThreads, ConcGCThreads), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2132 // degree of mt discovery |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2133 false, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2134 // Reference discovery is not atomic |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2135 &_is_alive_closure_cm, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2136 // is alive closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2137 // (for efficiency/performance) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2138 true); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2139 // Setting next fields of discovered |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2140 // lists requires a barrier. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2141 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2142 // STW ref processor |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2143 _ref_processor_stw = |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2144 new ReferenceProcessor(mr, // span |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2145 ParallelRefProcEnabled && (ParallelGCThreads > 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2146 // mt processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2147 MAX2((int)ParallelGCThreads, 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2148 // degree of mt processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2149 (ParallelGCThreads > 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2150 // mt discovery |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2151 MAX2((int)ParallelGCThreads, 1), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2152 // degree of mt discovery |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2153 true, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2154 // Reference discovery is atomic |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2155 &_is_alive_closure_stw, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2156 // is alive closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2157 // (for efficiency/performance) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2158 false); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2159 // Setting next fields of discovered |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
2160 // lists requires a barrier. |
| 342 | 2161 } |
| 2162 | |
| 2163 size_t G1CollectedHeap::capacity() const { | |
| 2164 return _g1_committed.byte_size(); | |
| 2165 } | |
| 2166 | |
| 1705 | 2167 void G1CollectedHeap::iterate_dirty_card_closure(CardTableEntryClosure* cl, |
| 2168 DirtyCardQueue* into_cset_dcq, | |
| 2169 bool concurrent, | |
| 342 | 2170 int worker_i) { |
| 889 | 2171 // Clean cards in the hot card cache |
| 1705 | 2172 concurrent_g1_refine()->clean_up_cache(worker_i, g1_rem_set(), into_cset_dcq); |
| 889 | 2173 |
| 342 | 2174 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
| 2175 int n_completed_buffers = 0; | |
| 1705 | 2176 while (dcqs.apply_closure_to_completed_buffer(cl, worker_i, 0, true)) { |
| 342 | 2177 n_completed_buffers++; |
| 2178 } | |
| 2179 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
| 2180 (double) n_completed_buffers); | |
| 2181 dcqs.clear_n_completed_buffers(); | |
| 2182 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
| 2183 } | |
| 2184 | |
| 2185 | |
| 2186 // Computes the sum of the storage used by the various regions. | |
| 2187 | |
| 2188 size_t G1CollectedHeap::used() const { | |
|
862
36b5611220a7
6863216: Clean up debugging debris inadvertently pushed with 6700789
ysr
parents:
861
diff
changeset
|
2189 assert(Heap_lock->owner() != NULL, |
|
36b5611220a7
6863216: Clean up debugging debris inadvertently pushed with 6700789
ysr
parents:
861
diff
changeset
|
2190 "Should be owned on this thread's behalf."); |
| 342 | 2191 size_t result = _summary_bytes_used; |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2192 // Read only once in case it is set to NULL concurrently |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2193 HeapRegion* hr = _mutator_alloc_region.get(); |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2194 if (hr != NULL) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2195 result += hr->used(); |
| 342 | 2196 return result; |
| 2197 } | |
| 2198 | |
|
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2199 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
|
2200 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
|
2201 return result; |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2202 } |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2203 |
| 342 | 2204 class SumUsedClosure: public HeapRegionClosure { |
| 2205 size_t _used; | |
| 2206 public: | |
| 2207 SumUsedClosure() : _used(0) {} | |
| 2208 bool doHeapRegion(HeapRegion* r) { | |
| 2209 if (!r->continuesHumongous()) { | |
| 2210 _used += r->used(); | |
| 2211 } | |
| 2212 return false; | |
| 2213 } | |
| 2214 size_t result() { return _used; } | |
| 2215 }; | |
| 2216 | |
| 2217 size_t G1CollectedHeap::recalculate_used() const { | |
| 2218 SumUsedClosure blk; | |
| 3766 | 2219 heap_region_iterate(&blk); |
| 342 | 2220 return blk.result(); |
| 2221 } | |
| 2222 | |
| 2223 size_t G1CollectedHeap::unsafe_max_alloc() { | |
| 2152 | 2224 if (free_regions() > 0) return HeapRegion::GrainBytes; |
| 342 | 2225 // otherwise, is there space in the current allocation region? |
| 2226 | |
| 2227 // We need to store the current allocation region in a local variable | |
| 2228 // here. The problem is that this method doesn't take any locks and | |
| 2229 // there may be other threads which overwrite the current allocation | |
| 2230 // region field. attempt_allocation(), for example, sets it to NULL | |
| 2231 // and this can happen *after* the NULL check here but before the call | |
| 2232 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
| 2233 // to be a problem in the optimized build, since the two loads of the | |
| 2234 // current allocation region field are optimized away. | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2235 HeapRegion* hr = _mutator_alloc_region.get(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
2236 if (hr == NULL) { |
| 342 | 2237 return 0; |
| 2238 } | |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
2239 return hr->free(); |
| 342 | 2240 } |
| 2241 | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2242 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
|
2243 return |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2244 ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
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|
2245 (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2246 } |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2247 |
|
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2248 #ifndef PRODUCT |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2249 void G1CollectedHeap::allocate_dummy_regions() { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2250 // Let's fill up most of the region |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2251 size_t word_size = HeapRegion::GrainWords - 1024; |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2252 // 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
|
2253 guarantee(isHumongous(word_size), "sanity"); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2254 |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2255 for (uintx i = 0; i < G1DummyRegionsPerGC; ++i) { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2256 // 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
|
2257 HeapWord* dummy_obj = humongous_obj_allocate(word_size); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2258 if (dummy_obj != NULL) { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2259 MemRegion mr(dummy_obj, word_size); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2260 CollectedHeap::fill_with_object(mr); |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2261 } else { |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2262 // 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
|
2263 // again. Let's get out of the loop. |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2264 break; |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2265 } |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2266 } |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2267 } |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2268 #endif // !PRODUCT |
|
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2269 |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2270 void G1CollectedHeap::increment_full_collections_completed(bool concurrent) { |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2271 MonitorLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
|
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2272 |
|
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|
2273 // We assume that if concurrent == true, then the caller is a |
|
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|
2274 // concurrent thread that was joined the Suspendible Thread |
|
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|
2275 // Set. If there's ever a cheap way to check this, we should add an |
|
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|
2276 // assert here. |
|
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|
2277 |
|
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|
2278 // We have already incremented _total_full_collections at the start |
|
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|
2279 // of the GC, so total_full_collections() represents how many full |
|
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|
2280 // collections have been started. |
|
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|
2281 unsigned int full_collections_started = total_full_collections(); |
|
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|
2282 |
|
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|
2283 // Given that this method is called at the end of a Full GC or of a |
|
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2284 // concurrent cycle, and those can be nested (i.e., a Full GC can |
|
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|
2285 // interrupt a concurrent cycle), the number of full collections |
|
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|
2286 // completed should be either one (in the case where there was no |
|
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|
2287 // nesting) or two (when a Full GC interrupted a concurrent cycle) |
|
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|
2288 // behind the number of full collections started. |
|
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|
2289 |
|
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|
2290 // This is the case for the inner caller, i.e. a Full GC. |
|
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|
2291 assert(concurrent || |
|
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|
2292 (full_collections_started == _full_collections_completed + 1) || |
|
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|
2293 (full_collections_started == _full_collections_completed + 2), |
|
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|
2294 err_msg("for inner caller (Full GC): full_collections_started = %u " |
|
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|
2295 "is inconsistent with _full_collections_completed = %u", |
|
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|
2296 full_collections_started, _full_collections_completed)); |
|
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|
2297 |
|
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|
2298 // This is the case for the outer caller, i.e. the concurrent cycle. |
|
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|
2299 assert(!concurrent || |
|
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|
2300 (full_collections_started == _full_collections_completed + 1), |
|
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|
2301 err_msg("for outer caller (concurrent cycle): " |
|
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|
2302 "full_collections_started = %u " |
|
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|
2303 "is inconsistent with _full_collections_completed = %u", |
|
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|
2304 full_collections_started, _full_collections_completed)); |
|
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|
2305 |
|
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|
2306 _full_collections_completed += 1; |
|
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|
2307 |
|
1840
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|
2308 // We need to clear the "in_progress" flag in the CM thread before |
|
4e0094bc41fa
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|
2309 // we wake up any waiters (especially when ExplicitInvokesConcurrent |
|
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|
2310 // is set) so that if a waiter requests another System.gc() it doesn't |
|
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|
2311 // incorrectly see that a marking cyle is still in progress. |
|
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|
2312 if (concurrent) { |
|
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|
2313 _cmThread->clear_in_progress(); |
|
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|
2314 } |
|
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|
2315 |
|
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|
2316 // This notify_all() will ensure that a thread that called |
|
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|
2317 // System.gc() with (with ExplicitGCInvokesConcurrent set or not) |
|
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|
2318 // and it's waiting for a full GC to finish will be woken up. It is |
|
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|
2319 // waiting in VM_G1IncCollectionPause::doit_epilogue(). |
|
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|
2320 FullGCCount_lock->notify_all(); |
|
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|
2321 } |
|
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|
2322 |
| 342 | 2323 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { |
| 2152 | 2324 assert_at_safepoint(true /* should_be_vm_thread */); |
| 342 | 2325 GCCauseSetter gcs(this, cause); |
| 2326 switch (cause) { | |
| 2327 case GCCause::_heap_inspection: | |
| 2328 case GCCause::_heap_dump: { | |
| 2329 HandleMark hm; | |
| 2330 do_full_collection(false); // don't clear all soft refs | |
| 2331 break; | |
| 2332 } | |
| 2333 default: // XXX FIX ME | |
| 2334 ShouldNotReachHere(); // Unexpected use of this function | |
| 2335 } | |
| 2336 } | |
| 2337 | |
|
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|
2338 void G1CollectedHeap::collect(GCCause::Cause cause) { |
|
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|
2339 // The caller doesn't have the Heap_lock |
|
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|
2340 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); |
|
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|
2341 |
|
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|
2342 unsigned int gc_count_before; |
|
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|
2343 unsigned int full_gc_count_before; |
| 342 | 2344 { |
|
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|
2345 MutexLocker ml(Heap_lock); |
| 1973 | 2346 |
|
1088
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|
2347 // Read the GC count while holding the Heap_lock |
|
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|
2348 gc_count_before = SharedHeap::heap()->total_collections(); |
|
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|
2349 full_gc_count_before = SharedHeap::heap()->total_full_collections(); |
|
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|
2350 } |
|
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|
2351 |
|
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|
2352 if (should_do_concurrent_full_gc(cause)) { |
|
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|
2353 // Schedule an initial-mark evacuation pause that will start a |
| 1973 | 2354 // concurrent cycle. We're setting word_size to 0 which means that |
| 2355 // we are not requesting a post-GC allocation. | |
|
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|
2356 VM_G1IncCollectionPause op(gc_count_before, |
| 1973 | 2357 0, /* word_size */ |
| 2358 true, /* should_initiate_conc_mark */ | |
|
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|
2359 g1_policy()->max_pause_time_ms(), |
|
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|
2360 cause); |
|
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|
2361 VMThread::execute(&op); |
|
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|
2362 } else { |
|
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|
2363 if (cause == GCCause::_gc_locker |
|
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|
2364 DEBUG_ONLY(|| cause == GCCause::_scavenge_alot)) { |
|
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|
2365 |
| 1973 | 2366 // Schedule a standard evacuation pause. We're setting word_size |
| 2367 // to 0 which means that we are not requesting a post-GC allocation. | |
|
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|
2368 VM_G1IncCollectionPause op(gc_count_before, |
| 1973 | 2369 0, /* word_size */ |
|
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|
2370 false, /* should_initiate_conc_mark */ |
|
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|
2371 g1_policy()->max_pause_time_ms(), |
|
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|
2372 cause); |
|
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|
2373 VMThread::execute(&op); |
|
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|
2374 } else { |
|
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|
2375 // Schedule a Full GC. |
|
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|
2376 VM_G1CollectFull op(gc_count_before, full_gc_count_before, cause); |
|
1088
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|
2377 VMThread::execute(&op); |
|
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|
2378 } |
| 342 | 2379 } |
| 2380 } | |
| 2381 | |
| 2382 bool G1CollectedHeap::is_in(const void* p) const { | |
| 3766 | 2383 HeapRegion* hr = _hrs.addr_to_region((HeapWord*) p); |
| 2384 if (hr != NULL) { | |
| 342 | 2385 return hr->is_in(p); |
| 2386 } else { | |
| 2387 return _perm_gen->as_gen()->is_in(p); | |
| 2388 } | |
| 2389 } | |
| 2390 | |
| 2391 // Iteration functions. | |
| 2392 | |
| 2393 // Iterates an OopClosure over all ref-containing fields of objects | |
| 2394 // within a HeapRegion. | |
| 2395 | |
| 2396 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
| 2397 MemRegion _mr; | |
| 2398 OopClosure* _cl; | |
| 2399 public: | |
| 2400 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
| 2401 : _mr(mr), _cl(cl) {} | |
| 2402 bool doHeapRegion(HeapRegion* r) { | |
| 2403 if (! r->continuesHumongous()) { | |
| 2404 r->oop_iterate(_cl); | |
| 2405 } | |
| 2406 return false; | |
| 2407 } | |
| 2408 }; | |
| 2409 | |
| 678 | 2410 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
| 342 | 2411 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
| 3766 | 2412 heap_region_iterate(&blk); |
| 678 | 2413 if (do_perm) { |
| 2414 perm_gen()->oop_iterate(cl); | |
| 2415 } | |
| 342 | 2416 } |
| 2417 | |
| 678 | 2418 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
| 342 | 2419 IterateOopClosureRegionClosure blk(mr, cl); |
| 3766 | 2420 heap_region_iterate(&blk); |
| 678 | 2421 if (do_perm) { |
| 2422 perm_gen()->oop_iterate(cl); | |
| 2423 } | |
| 342 | 2424 } |
| 2425 | |
| 2426 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
| 2427 | |
| 2428 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
| 2429 ObjectClosure* _cl; | |
| 2430 public: | |
| 2431 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
| 2432 bool doHeapRegion(HeapRegion* r) { | |
| 2433 if (! r->continuesHumongous()) { | |
| 2434 r->object_iterate(_cl); | |
| 2435 } | |
| 2436 return false; | |
| 2437 } | |
| 2438 }; | |
| 2439 | |
| 678 | 2440 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
| 342 | 2441 IterateObjectClosureRegionClosure blk(cl); |
| 3766 | 2442 heap_region_iterate(&blk); |
| 678 | 2443 if (do_perm) { |
| 2444 perm_gen()->object_iterate(cl); | |
| 2445 } | |
| 342 | 2446 } |
| 2447 | |
| 2448 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
| 2449 // FIXME: is this right? | |
| 2450 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
| 2451 } | |
| 2452 | |
| 2453 // Calls a SpaceClosure on a HeapRegion. | |
| 2454 | |
| 2455 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
| 2456 SpaceClosure* _cl; | |
| 2457 public: | |
| 2458 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
| 2459 bool doHeapRegion(HeapRegion* r) { | |
| 2460 _cl->do_space(r); | |
| 2461 return false; | |
| 2462 } | |
| 2463 }; | |
| 2464 | |
| 2465 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
| 2466 SpaceClosureRegionClosure blk(cl); | |
| 3766 | 2467 heap_region_iterate(&blk); |
| 342 | 2468 } |
| 2469 | |
| 3766 | 2470 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) const { |
| 2471 _hrs.iterate(cl); | |
| 342 | 2472 } |
| 2473 | |
| 2474 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
| 3766 | 2475 HeapRegionClosure* cl) const { |
| 2476 _hrs.iterate_from(r, cl); | |
| 342 | 2477 } |
| 2478 | |
| 2479 void | |
| 2480 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
| 2481 int worker, | |
| 2482 jint claim_value) { | |
| 355 | 2483 const size_t regions = n_regions(); |
|
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1755
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|
2484 const size_t worker_num = (G1CollectedHeap::use_parallel_gc_threads() ? ParallelGCThreads : 1); |
| 355 | 2485 // try to spread out the starting points of the workers |
| 2486 const size_t start_index = regions / worker_num * (size_t) worker; | |
| 2487 | |
| 2488 // each worker will actually look at all regions | |
| 2489 for (size_t count = 0; count < regions; ++count) { | |
| 2490 const size_t index = (start_index + count) % regions; | |
| 2491 assert(0 <= index && index < regions, "sanity"); | |
| 2492 HeapRegion* r = region_at(index); | |
| 2493 // we'll ignore "continues humongous" regions (we'll process them | |
| 2494 // when we come across their corresponding "start humongous" | |
| 2495 // region) and regions already claimed | |
| 2496 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
| 2497 continue; | |
| 2498 } | |
| 2499 // OK, try to claim it | |
| 342 | 2500 if (r->claimHeapRegion(claim_value)) { |
| 355 | 2501 // success! |
| 2502 assert(!r->continuesHumongous(), "sanity"); | |
| 2503 if (r->startsHumongous()) { | |
| 2504 // If the region is "starts humongous" we'll iterate over its | |
| 2505 // "continues humongous" first; in fact we'll do them | |
| 2506 // first. The order is important. In on case, calling the | |
| 2507 // closure on the "starts humongous" region might de-allocate | |
| 2508 // and clear all its "continues humongous" regions and, as a | |
| 2509 // result, we might end up processing them twice. So, we'll do | |
| 2510 // them first (notice: most closures will ignore them anyway) and | |
| 2511 // then we'll do the "starts humongous" region. | |
| 2512 for (size_t ch_index = index + 1; ch_index < regions; ++ch_index) { | |
| 2513 HeapRegion* chr = region_at(ch_index); | |
| 2514 | |
| 2515 // if the region has already been claimed or it's not | |
| 2516 // "continues humongous" we're done | |
| 2517 if (chr->claim_value() == claim_value || | |
| 2518 !chr->continuesHumongous()) { | |
| 2519 break; | |
| 2520 } | |
| 2521 | |
| 2522 // Noone should have claimed it directly. We can given | |
| 2523 // that we claimed its "starts humongous" region. | |
| 2524 assert(chr->claim_value() != claim_value, "sanity"); | |
| 2525 assert(chr->humongous_start_region() == r, "sanity"); | |
| 2526 | |
| 2527 if (chr->claimHeapRegion(claim_value)) { | |
| 2528 // we should always be able to claim it; noone else should | |
| 2529 // be trying to claim this region | |
| 2530 | |
| 2531 bool res2 = cl->doHeapRegion(chr); | |
| 2532 assert(!res2, "Should not abort"); | |
| 2533 | |
| 2534 // Right now, this holds (i.e., no closure that actually | |
| 2535 // does something with "continues humongous" regions | |
| 2536 // clears them). We might have to weaken it in the future, | |
| 2537 // but let's leave these two asserts here for extra safety. | |
| 2538 assert(chr->continuesHumongous(), "should still be the case"); | |
| 2539 assert(chr->humongous_start_region() == r, "sanity"); | |
| 2540 } else { | |
| 2541 guarantee(false, "we should not reach here"); | |
| 2542 } | |
| 2543 } | |
| 2544 } | |
| 2545 | |
| 2546 assert(!r->continuesHumongous(), "sanity"); | |
| 2547 bool res = cl->doHeapRegion(r); | |
| 2548 assert(!res, "Should not abort"); | |
| 2549 } | |
| 2550 } | |
| 2551 } | |
| 2552 | |
| 390 | 2553 class ResetClaimValuesClosure: public HeapRegionClosure { |
| 2554 public: | |
| 2555 bool doHeapRegion(HeapRegion* r) { | |
| 2556 r->set_claim_value(HeapRegion::InitialClaimValue); | |
| 2557 return false; | |
| 2558 } | |
| 2559 }; | |
| 2560 | |
| 2561 void | |
| 2562 G1CollectedHeap::reset_heap_region_claim_values() { | |
| 2563 ResetClaimValuesClosure blk; | |
| 2564 heap_region_iterate(&blk); | |
| 2565 } | |
| 2566 | |
| 355 | 2567 #ifdef ASSERT |
| 2568 // This checks whether all regions in the heap have the correct claim | |
| 2569 // value. I also piggy-backed on this a check to ensure that the | |
| 2570 // humongous_start_region() information on "continues humongous" | |
| 2571 // regions is correct. | |
| 2572 | |
| 2573 class CheckClaimValuesClosure : public HeapRegionClosure { | |
| 2574 private: | |
| 2575 jint _claim_value; | |
| 2576 size_t _failures; | |
| 2577 HeapRegion* _sh_region; | |
| 2578 public: | |
| 2579 CheckClaimValuesClosure(jint claim_value) : | |
| 2580 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
| 2581 bool doHeapRegion(HeapRegion* r) { | |
| 2582 if (r->claim_value() != _claim_value) { | |
| 2583 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
| 2584 "claim value = %d, should be %d", | |
| 2585 r->bottom(), r->end(), r->claim_value(), | |
| 2586 _claim_value); | |
| 2587 ++_failures; | |
| 2588 } | |
| 2589 if (!r->isHumongous()) { | |
| 2590 _sh_region = NULL; | |
| 2591 } else if (r->startsHumongous()) { | |
| 2592 _sh_region = r; | |
| 2593 } else if (r->continuesHumongous()) { | |
| 2594 if (r->humongous_start_region() != _sh_region) { | |
| 2595 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
| 2596 "HS = "PTR_FORMAT", should be "PTR_FORMAT, | |
| 2597 r->bottom(), r->end(), | |
| 2598 r->humongous_start_region(), | |
| 2599 _sh_region); | |
| 2600 ++_failures; | |
| 342 | 2601 } |
| 2602 } | |
| 355 | 2603 return false; |
| 2604 } | |
| 2605 size_t failures() { | |
| 2606 return _failures; | |
| 2607 } | |
| 2608 }; | |
| 2609 | |
| 2610 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
| 2611 CheckClaimValuesClosure cl(claim_value); | |
| 2612 heap_region_iterate(&cl); | |
| 2613 return cl.failures() == 0; | |
| 2614 } | |
| 2615 #endif // ASSERT | |
| 342 | 2616 |
| 2617 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { | |
| 2618 HeapRegion* r = g1_policy()->collection_set(); | |
| 2619 while (r != NULL) { | |
| 2620 HeapRegion* next = r->next_in_collection_set(); | |
| 2621 if (cl->doHeapRegion(r)) { | |
| 2622 cl->incomplete(); | |
| 2623 return; | |
| 2624 } | |
| 2625 r = next; | |
| 2626 } | |
| 2627 } | |
| 2628 | |
| 2629 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
| 2630 HeapRegionClosure *cl) { | |
|
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2631 if (r == NULL) { |
|
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|
2632 // The CSet is empty so there's nothing to do. |
|
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|
2633 return; |
|
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|
2634 } |
|
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|
2635 |
| 342 | 2636 assert(r->in_collection_set(), |
| 2637 "Start region must be a member of the collection set."); | |
| 2638 HeapRegion* cur = r; | |
| 2639 while (cur != NULL) { | |
| 2640 HeapRegion* next = cur->next_in_collection_set(); | |
| 2641 if (cl->doHeapRegion(cur) && false) { | |
| 2642 cl->incomplete(); | |
| 2643 return; | |
| 2644 } | |
| 2645 cur = next; | |
| 2646 } | |
| 2647 cur = g1_policy()->collection_set(); | |
| 2648 while (cur != r) { | |
| 2649 HeapRegion* next = cur->next_in_collection_set(); | |
| 2650 if (cl->doHeapRegion(cur) && false) { | |
| 2651 cl->incomplete(); | |
| 2652 return; | |
| 2653 } | |
| 2654 cur = next; | |
| 2655 } | |
| 2656 } | |
| 2657 | |
| 2658 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
| 3766 | 2659 return n_regions() > 0 ? region_at(0) : NULL; |
| 342 | 2660 } |
| 2661 | |
| 2662 | |
| 2663 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
| 2664 Space* res = heap_region_containing(addr); | |
| 2665 if (res == NULL) | |
| 2666 res = perm_gen()->space_containing(addr); | |
| 2667 return res; | |
| 2668 } | |
| 2669 | |
| 2670 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
| 2671 Space* sp = space_containing(addr); | |
| 2672 if (sp != NULL) { | |
| 2673 return sp->block_start(addr); | |
| 2674 } | |
| 2675 return NULL; | |
| 2676 } | |
| 2677 | |
| 2678 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
| 2679 Space* sp = space_containing(addr); | |
| 2680 assert(sp != NULL, "block_size of address outside of heap"); | |
| 2681 return sp->block_size(addr); | |
| 2682 } | |
| 2683 | |
| 2684 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
| 2685 Space* sp = space_containing(addr); | |
| 2686 return sp->block_is_obj(addr); | |
| 2687 } | |
| 2688 | |
| 2689 bool G1CollectedHeap::supports_tlab_allocation() const { | |
| 2690 return true; | |
| 2691 } | |
| 2692 | |
| 2693 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
| 2694 return HeapRegion::GrainBytes; | |
| 2695 } | |
| 2696 | |
| 2697 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
| 2698 // Return the remaining space in the cur alloc region, but not less than | |
| 2699 // the min TLAB size. | |
|
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2700 |
|
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2701 // Also, this value can be at most the humongous object threshold, |
|
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2702 // since we can't allow tlabs to grow big enough to accomodate |
|
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2703 // humongous objects. |
|
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2704 |
|
2433
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|
2705 HeapRegion* hr = _mutator_alloc_region.get(); |
|
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2706 size_t max_tlab_size = _humongous_object_threshold_in_words * wordSize; |
|
2433
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|
2707 if (hr == NULL) { |
|
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2708 return max_tlab_size; |
| 342 | 2709 } else { |
|
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|
2710 return MIN2(MAX2(hr->free(), (size_t) MinTLABSize), max_tlab_size); |
| 342 | 2711 } |
| 2712 } | |
| 2713 | |
| 2714 size_t G1CollectedHeap::max_capacity() const { | |
|
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|
2715 return _g1_reserved.byte_size(); |
| 342 | 2716 } |
| 2717 | |
| 2718 jlong G1CollectedHeap::millis_since_last_gc() { | |
| 2719 // assert(false, "NYI"); | |
| 2720 return 0; | |
| 2721 } | |
| 2722 | |
| 2723 void G1CollectedHeap::prepare_for_verify() { | |
| 2724 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
| 2725 ensure_parsability(false); | |
| 2726 } | |
| 2727 g1_rem_set()->prepare_for_verify(); | |
| 2728 } | |
| 2729 | |
| 2730 class VerifyLivenessOopClosure: public OopClosure { | |
|
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2731 G1CollectedHeap* _g1h; |
|
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|
2732 VerifyOption _vo; |
| 342 | 2733 public: |
|
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2734 VerifyLivenessOopClosure(G1CollectedHeap* g1h, VerifyOption vo): |
|
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2735 _g1h(g1h), _vo(vo) |
|
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2736 { } |
|
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2737 void do_oop(narrowOop *p) { do_oop_work(p); } |
|
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2738 void do_oop( oop *p) { do_oop_work(p); } |
|
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2739 |
|
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2740 template <class T> void do_oop_work(T *p) { |
|
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|
2741 oop obj = oopDesc::load_decode_heap_oop(p); |
|
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|
2742 guarantee(obj == NULL || !_g1h->is_obj_dead_cond(obj, _vo), |
|
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|
2743 "Dead object referenced by a not dead object"); |
| 342 | 2744 } |
| 2745 }; | |
| 2746 | |
| 2747 class VerifyObjsInRegionClosure: public ObjectClosure { | |
| 811 | 2748 private: |
| 342 | 2749 G1CollectedHeap* _g1h; |
| 2750 size_t _live_bytes; | |
| 2751 HeapRegion *_hr; | |
|
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|
2752 VerifyOption _vo; |
| 342 | 2753 public: |
|
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|
2754 // _vo == UsePrevMarking -> use "prev" marking information, |
|
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|
2755 // _vo == UseNextMarking -> use "next" marking information, |
|
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2756 // _vo == UseMarkWord -> use mark word from object header. |
|
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|
2757 VerifyObjsInRegionClosure(HeapRegion *hr, VerifyOption vo) |
|
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|
2758 : _live_bytes(0), _hr(hr), _vo(vo) { |
| 342 | 2759 _g1h = G1CollectedHeap::heap(); |
| 2760 } | |
| 2761 void do_object(oop o) { | |
|
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|
2762 VerifyLivenessOopClosure isLive(_g1h, _vo); |
| 342 | 2763 assert(o != NULL, "Huh?"); |
|
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|
2764 if (!_g1h->is_obj_dead_cond(o, _vo)) { |
|
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|
2765 // If the object is alive according to the mark word, |
|
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|
2766 // then verify that the marking information agrees. |
|
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|
2767 // Note we can't verify the contra-positive of the |
|
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|
2768 // above: if the object is dead (according to the mark |
|
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|
2769 // word), it may not be marked, or may have been marked |
|
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|
2770 // but has since became dead, or may have been allocated |
|
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|
2771 // since the last marking. |
|
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|
2772 if (_vo == VerifyOption_G1UseMarkWord) { |
|
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|
2773 guarantee(!_g1h->is_obj_dead(o), "mark word and concurrent mark mismatch"); |
|
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|
2774 } |
|
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|
2775 |
| 342 | 2776 o->oop_iterate(&isLive); |
|
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|
2777 if (!_hr->obj_allocated_since_prev_marking(o)) { |
|
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|
2778 size_t obj_size = o->size(); // Make sure we don't overflow |
|
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|
2779 _live_bytes += (obj_size * HeapWordSize); |
|
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|
2780 } |
| 342 | 2781 } |
| 2782 } | |
| 2783 size_t live_bytes() { return _live_bytes; } | |
| 2784 }; | |
| 2785 | |
| 2786 class PrintObjsInRegionClosure : public ObjectClosure { | |
| 2787 HeapRegion *_hr; | |
| 2788 G1CollectedHeap *_g1; | |
| 2789 public: | |
| 2790 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
| 2791 _g1 = G1CollectedHeap::heap(); | |
| 2792 }; | |
| 2793 | |
| 2794 void do_object(oop o) { | |
| 2795 if (o != NULL) { | |
| 2796 HeapWord *start = (HeapWord *) o; | |
| 2797 size_t word_sz = o->size(); | |
| 2798 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
| 2799 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
| 2800 (void*) o, word_sz, | |
| 2801 _g1->isMarkedPrev(o), | |
| 2802 _g1->isMarkedNext(o), | |
| 2803 _hr->obj_allocated_since_prev_marking(o)); | |
| 2804 HeapWord *end = start + word_sz; | |
| 2805 HeapWord *cur; | |
| 2806 int *val; | |
| 2807 for (cur = start; cur < end; cur++) { | |
| 2808 val = (int *) cur; | |
| 2809 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
| 2810 } | |
| 2811 } | |
| 2812 } | |
| 2813 }; | |
| 2814 | |
| 2815 class VerifyRegionClosure: public HeapRegionClosure { | |
| 811 | 2816 private: |
|
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|
2817 bool _allow_dirty; |
|
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|
2818 bool _par; |
|
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|
2819 VerifyOption _vo; |
|
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|
2820 bool _failures; |
| 811 | 2821 public: |
|
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2822 // _vo == UsePrevMarking -> use "prev" marking information, |
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2823 // _vo == UseNextMarking -> use "next" marking information, |
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2824 // _vo == UseMarkWord -> use mark word from object header. |
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2825 VerifyRegionClosure(bool allow_dirty, bool par, VerifyOption vo) |
|
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2826 : _allow_dirty(allow_dirty), |
|
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2827 _par(par), |
|
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2828 _vo(vo), |
|
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|
2829 _failures(false) {} |
|
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|
2830 |
|
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|
2831 bool failures() { |
|
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|
2832 return _failures; |
|
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|
2833 } |
|
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|
2834 |
| 342 | 2835 bool doHeapRegion(HeapRegion* r) { |
| 390 | 2836 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
| 2837 "Should be unclaimed at verify points."); | |
|
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2838 if (!r->continuesHumongous()) { |
|
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|
2839 bool failures = false; |
|
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|
2840 r->verify(_allow_dirty, _vo, &failures); |
|
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|
2841 if (failures) { |
|
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|
2842 _failures = true; |
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|
2843 } else { |
|
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|
2844 VerifyObjsInRegionClosure not_dead_yet_cl(r, _vo); |
|
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|
2845 r->object_iterate(¬_dead_yet_cl); |
|
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|
2846 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) { |
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|
2847 gclog_or_tty->print_cr("["PTR_FORMAT","PTR_FORMAT"] " |
|
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|
2848 "max_live_bytes "SIZE_FORMAT" " |
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|
2849 "< calculated "SIZE_FORMAT, |
|
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|
2850 r->bottom(), r->end(), |
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|
2851 r->max_live_bytes(), |
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|
2852 not_dead_yet_cl.live_bytes()); |
|
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|
2853 _failures = true; |
|
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|
2854 } |
|
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|
2855 } |
| 342 | 2856 } |
|
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|
2857 return false; // stop the region iteration if we hit a failure |
| 342 | 2858 } |
| 2859 }; | |
| 2860 | |
| 2861 class VerifyRootsClosure: public OopsInGenClosure { | |
| 2862 private: | |
| 2863 G1CollectedHeap* _g1h; | |
|
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|
2864 VerifyOption _vo; |
| 342 | 2865 bool _failures; |
| 2866 public: | |
|
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|
2867 // _vo == UsePrevMarking -> use "prev" marking information, |
|
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|
2868 // _vo == UseNextMarking -> use "next" marking information, |
|
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|
2869 // _vo == UseMarkWord -> use mark word from object header. |
|
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|
2870 VerifyRootsClosure(VerifyOption vo) : |
|
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|
2871 _g1h(G1CollectedHeap::heap()), |
|
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|
2872 _vo(vo), |
|
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|
2873 _failures(false) { } |
| 342 | 2874 |
| 2875 bool failures() { return _failures; } | |
| 2876 | |
|
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|
2877 template <class T> void do_oop_nv(T* p) { |
|
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|
2878 T heap_oop = oopDesc::load_heap_oop(p); |
|
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|
2879 if (!oopDesc::is_null(heap_oop)) { |
|
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|
2880 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
|
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|
2881 if (_g1h->is_obj_dead_cond(obj, _vo)) { |
| 342 | 2882 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
|
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|
2883 "points to dead obj "PTR_FORMAT, p, (void*) obj); |
|
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|
2884 if (_vo == VerifyOption_G1UseMarkWord) { |
|
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|
2885 gclog_or_tty->print_cr(" Mark word: "PTR_FORMAT, (void*)(obj->mark())); |
|
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|
2886 } |
| 342 | 2887 obj->print_on(gclog_or_tty); |
| 2888 _failures = true; | |
| 2889 } | |
| 2890 } | |
| 2891 } | |
|
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|
2892 |
|
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|
2893 void do_oop(oop* p) { do_oop_nv(p); } |
|
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|
2894 void do_oop(narrowOop* p) { do_oop_nv(p); } |
| 342 | 2895 }; |
| 2896 | |
| 390 | 2897 // This is the task used for parallel heap verification. |
| 2898 | |
| 2899 class G1ParVerifyTask: public AbstractGangTask { | |
| 2900 private: | |
| 2901 G1CollectedHeap* _g1h; | |
|
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|
2902 bool _allow_dirty; |
|
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|
2903 VerifyOption _vo; |
|
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changeset
|
2904 bool _failures; |
| 390 | 2905 |
| 2906 public: | |
|
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|
2907 // _vo == UsePrevMarking -> use "prev" marking information, |
|
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|
2908 // _vo == UseNextMarking -> use "next" marking information, |
|
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|
2909 // _vo == UseMarkWord -> use mark word from object header. |
|
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|
2910 G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty, VerifyOption vo) : |
| 390 | 2911 AbstractGangTask("Parallel verify task"), |
|
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|
2912 _g1h(g1h), |
|
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|
2913 _allow_dirty(allow_dirty), |
|
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|
2914 _vo(vo), |
|
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|
2915 _failures(false) { } |
|
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|
2916 |
|
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|
2917 bool failures() { |
|
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|
2918 return _failures; |
|
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|
2919 } |
| 390 | 2920 |
| 2921 void work(int worker_i) { | |
|
637
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|
2922 HandleMark hm; |
|
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changeset
|
2923 VerifyRegionClosure blk(_allow_dirty, true, _vo); |
| 390 | 2924 _g1h->heap_region_par_iterate_chunked(&blk, worker_i, |
| 2925 HeapRegion::ParVerifyClaimValue); | |
|
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|
2926 if (blk.failures()) { |
|
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|
2927 _failures = true; |
|
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|
2928 } |
| 390 | 2929 } |
| 2930 }; | |
| 2931 | |
| 342 | 2932 void G1CollectedHeap::verify(bool allow_dirty, bool silent) { |
|
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|
2933 verify(allow_dirty, silent, VerifyOption_G1UsePrevMarking); |
| 811 | 2934 } |
| 2935 | |
| 2936 void G1CollectedHeap::verify(bool allow_dirty, | |
| 2937 bool silent, | |
|
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|
2938 VerifyOption vo) { |
| 342 | 2939 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
|
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|
2940 if (!silent) { gclog_or_tty->print("Roots (excluding permgen) "); } |
|
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|
2941 VerifyRootsClosure rootsCl(vo); |
|
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|
2942 CodeBlobToOopClosure blobsCl(&rootsCl, /*do_marking=*/ false); |
|
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|
2943 |
|
3293
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|
2944 // We apply the relevant closures to all the oops in the |
|
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|
2945 // system dictionary, the string table and the code cache. |
|
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|
2946 const int so = SharedHeap::SO_AllClasses | SharedHeap::SO_Strings | SharedHeap::SO_CodeCache; |
|
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|
2947 |
|
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|
2948 process_strong_roots(true, // activate StrongRootsScope |
|
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|
2949 true, // we set "collecting perm gen" to true, |
|
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|
2950 // so we don't reset the dirty cards in the perm gen. |
|
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|
2951 SharedHeap::ScanningOption(so), // roots scanning options |
| 342 | 2952 &rootsCl, |
|
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|
2953 &blobsCl, |
| 342 | 2954 &rootsCl); |
|
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|
2955 |
|
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|
2956 // If we're verifying after the marking phase of a Full GC then we can't |
|
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|
2957 // treat the perm gen as roots into the G1 heap. Some of the objects in |
|
6747fd0512e0
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|
2958 // the perm gen may be dead and hence not marked. If one of these dead |
|
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|
2959 // objects is considered to be a root then we may end up with a false |
|
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|
2960 // "Root location <x> points to dead ob <y>" failure. |
|
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|
2961 if (vo != VerifyOption_G1UseMarkWord) { |
|
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|
2962 // Since we used "collecting_perm_gen" == true above, we will not have |
|
6747fd0512e0
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|
2963 // checked the refs from perm into the G1-collected heap. We check those |
|
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|
2964 // references explicitly below. Whether the relevant cards are dirty |
|
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|
2965 // is checked further below in the rem set verification. |
|
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changeset
|
2966 if (!silent) { gclog_or_tty->print("Permgen roots "); } |
|
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|
2967 perm_gen()->oop_iterate(&rootsCl); |
|
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|
2968 } |
|
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|
2969 bool failures = rootsCl.failures(); |
|
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|
2970 |
|
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changeset
|
2971 if (vo != VerifyOption_G1UseMarkWord) { |
|
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changeset
|
2972 // If we're verifying during a full GC then the region sets |
|
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|
2973 // will have been torn down at the start of the GC. Therefore |
|
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changeset
|
2974 // verifying the region sets will fail. So we only verify |
|
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|
2975 // the region sets when not in a full GC. |
|
6747fd0512e0
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|
2976 if (!silent) { gclog_or_tty->print("HeapRegionSets "); } |
|
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|
2977 verify_region_sets(); |
|
6747fd0512e0
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|
2978 } |
|
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|
2979 |
| 2152 | 2980 if (!silent) { gclog_or_tty->print("HeapRegions "); } |
| 390 | 2981 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
| 2982 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 2983 "sanity check"); | |
| 2984 | |
|
3772
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|
2985 G1ParVerifyTask task(this, allow_dirty, vo); |
| 390 | 2986 int n_workers = workers()->total_workers(); |
| 2987 set_par_threads(n_workers); | |
| 2988 workers()->run_task(&task); | |
| 2989 set_par_threads(0); | |
|
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|
2990 if (task.failures()) { |
|
ff2402f6a50b
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|
2991 failures = true; |
|
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|
2992 } |
| 390 | 2993 |
| 2994 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), | |
| 2995 "sanity check"); | |
| 2996 | |
| 2997 reset_heap_region_claim_values(); | |
| 2998 | |
| 2999 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 3000 "sanity check"); | |
| 3001 } else { | |
|
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|
3002 VerifyRegionClosure blk(allow_dirty, false, vo); |
| 3766 | 3003 heap_region_iterate(&blk); |
|
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|
3004 if (blk.failures()) { |
|
ff2402f6a50b
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|
3005 failures = true; |
|
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|
3006 } |
| 390 | 3007 } |
| 2152 | 3008 if (!silent) gclog_or_tty->print("RemSet "); |
| 342 | 3009 rem_set()->verify(); |
|
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|
3010 |
|
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|
3011 if (failures) { |
|
ff2402f6a50b
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|
3012 gclog_or_tty->print_cr("Heap:"); |
|
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|
3013 print_on(gclog_or_tty, true /* extended */); |
|
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|
3014 gclog_or_tty->print_cr(""); |
|
1547
fb1a39993f69
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|
3015 #ifndef PRODUCT |
| 1044 | 3016 if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) { |
| 1388 | 3017 concurrent_mark()->print_reachable("at-verification-failure", |
|
3772
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|
3018 vo, false /* all */); |
|
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|
3019 } |
|
1547
fb1a39993f69
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|
3020 #endif |
|
1020
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|
3021 gclog_or_tty->flush(); |
|
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|
3022 } |
|
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|
3023 guarantee(!failures, "there should not have been any failures"); |
| 342 | 3024 } else { |
| 3025 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
| 3026 } | |
| 3027 } | |
| 3028 | |
| 3029 class PrintRegionClosure: public HeapRegionClosure { | |
| 3030 outputStream* _st; | |
| 3031 public: | |
| 3032 PrintRegionClosure(outputStream* st) : _st(st) {} | |
| 3033 bool doHeapRegion(HeapRegion* r) { | |
| 3034 r->print_on(_st); | |
| 3035 return false; | |
| 3036 } | |
| 3037 }; | |
| 3038 | |
|
838
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|
3039 void G1CollectedHeap::print() const { print_on(tty); } |
| 342 | 3040 |
| 3041 void G1CollectedHeap::print_on(outputStream* st) const { | |
|
838
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|
3042 print_on(st, PrintHeapAtGCExtended); |
|
0316eac49d5a
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|
3043 } |
|
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|
3044 |
|
0316eac49d5a
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|
3045 void G1CollectedHeap::print_on(outputStream* st, bool extended) const { |
|
0316eac49d5a
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|
3046 st->print(" %-20s", "garbage-first heap"); |
|
0316eac49d5a
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tonyp
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|
3047 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
|
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
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845
diff
changeset
|
3048 capacity()/K, used_unlocked()/K); |
|
838
0316eac49d5a
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|
3049 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
|
0316eac49d5a
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|
3050 _g1_storage.low_boundary(), |
|
0316eac49d5a
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|
3051 _g1_storage.high(), |
|
0316eac49d5a
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|
3052 _g1_storage.high_boundary()); |
|
0316eac49d5a
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|
3053 st->cr(); |
|
0316eac49d5a
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|
3054 st->print(" region size " SIZE_FORMAT "K, ", |
|
0316eac49d5a
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changeset
|
3055 HeapRegion::GrainBytes/K); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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changeset
|
3056 size_t young_regions = _young_list->length(); |
|
0316eac49d5a
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|
3057 st->print(SIZE_FORMAT " young (" SIZE_FORMAT "K), ", |
|
0316eac49d5a
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|
3058 young_regions, young_regions * HeapRegion::GrainBytes / K); |
|
0316eac49d5a
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|
3059 size_t survivor_regions = g1_policy()->recorded_survivor_regions(); |
|
0316eac49d5a
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|
3060 st->print(SIZE_FORMAT " survivors (" SIZE_FORMAT "K)", |
|
0316eac49d5a
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|
3061 survivor_regions, survivor_regions * HeapRegion::GrainBytes / K); |
|
0316eac49d5a
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|
3062 st->cr(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3063 perm()->as_gen()->print_on(st); |
|
0316eac49d5a
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|
3064 if (extended) { |
|
1020
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changeset
|
3065 st->cr(); |
|
838
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|
3066 print_on_extended(st); |
|
0316eac49d5a
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|
3067 } |
|
0316eac49d5a
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|
3068 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
3069 |
|
0316eac49d5a
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tonyp
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changeset
|
3070 void G1CollectedHeap::print_on_extended(outputStream* st) const { |
| 342 | 3071 PrintRegionClosure blk(st); |
| 3766 | 3072 heap_region_iterate(&blk); |
| 342 | 3073 } |
| 3074 | |
| 3075 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
3076 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 1019 | 3077 workers()->print_worker_threads_on(st); |
| 3078 } | |
| 3079 _cmThread->print_on(st); | |
| 342 | 3080 st->cr(); |
| 1019 | 3081 _cm->print_worker_threads_on(st); |
| 3082 _cg1r->print_worker_threads_on(st); | |
| 342 | 3083 st->cr(); |
| 3084 } | |
| 3085 | |
| 3086 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
3087 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3088 workers()->threads_do(tc); |
| 3089 } | |
| 3090 tc->do_thread(_cmThread); | |
| 794 | 3091 _cg1r->threads_do(tc); |
| 342 | 3092 } |
| 3093 | |
| 3094 void G1CollectedHeap::print_tracing_info() const { | |
| 3095 // We'll overload this to mean "trace GC pause statistics." | |
| 3096 if (TraceGen0Time || TraceGen1Time) { | |
| 3097 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
| 3098 // to that. | |
| 3099 g1_policy()->print_tracing_info(); | |
| 3100 } | |
| 751 | 3101 if (G1SummarizeRSetStats) { |
| 342 | 3102 g1_rem_set()->print_summary_info(); |
| 3103 } | |
| 1282 | 3104 if (G1SummarizeConcMark) { |
| 342 | 3105 concurrent_mark()->print_summary_info(); |
| 3106 } | |
| 3107 g1_policy()->print_yg_surv_rate_info(); | |
| 3108 SpecializationStats::print(); | |
| 3109 } | |
| 3110 | |
|
3777
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7046182: G1: remove unnecessary iterations over the collection set
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diff
changeset
|
3111 #ifndef PRODUCT |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3112 // Helpful for debugging RSet issues. |
|
e8b0b0392037
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tonyp
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3774
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changeset
|
3113 |
|
e8b0b0392037
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changeset
|
3114 class PrintRSetsClosure : public HeapRegionClosure { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3115 private: |
|
e8b0b0392037
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diff
changeset
|
3116 const char* _msg; |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
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3774
diff
changeset
|
3117 size_t _occupied_sum; |
|
e8b0b0392037
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diff
changeset
|
3118 |
|
e8b0b0392037
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diff
changeset
|
3119 public: |
|
e8b0b0392037
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diff
changeset
|
3120 bool doHeapRegion(HeapRegion* r) { |
|
e8b0b0392037
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changeset
|
3121 HeapRegionRemSet* hrrs = r->rem_set(); |
|
e8b0b0392037
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changeset
|
3122 size_t occupied = hrrs->occupied(); |
|
e8b0b0392037
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diff
changeset
|
3123 _occupied_sum += occupied; |
|
e8b0b0392037
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diff
changeset
|
3124 |
|
e8b0b0392037
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diff
changeset
|
3125 gclog_or_tty->print_cr("Printing RSet for region "HR_FORMAT, |
|
e8b0b0392037
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diff
changeset
|
3126 HR_FORMAT_PARAMS(r)); |
|
e8b0b0392037
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tonyp
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3774
diff
changeset
|
3127 if (occupied == 0) { |
|
e8b0b0392037
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tonyp
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3774
diff
changeset
|
3128 gclog_or_tty->print_cr(" RSet is empty"); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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3774
diff
changeset
|
3129 } else { |
|
e8b0b0392037
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3774
diff
changeset
|
3130 hrrs->print(); |
|
e8b0b0392037
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3774
diff
changeset
|
3131 } |
|
e8b0b0392037
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changeset
|
3132 gclog_or_tty->print_cr("----------"); |
|
e8b0b0392037
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diff
changeset
|
3133 return false; |
|
e8b0b0392037
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parents:
3774
diff
changeset
|
3134 } |
|
e8b0b0392037
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diff
changeset
|
3135 |
|
e8b0b0392037
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diff
changeset
|
3136 PrintRSetsClosure(const char* msg) : _msg(msg), _occupied_sum(0) { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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diff
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|
3137 gclog_or_tty->cr(); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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diff
changeset
|
3138 gclog_or_tty->print_cr("========================================"); |
|
e8b0b0392037
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changeset
|
3139 gclog_or_tty->print_cr(msg); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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diff
changeset
|
3140 gclog_or_tty->cr(); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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3774
diff
changeset
|
3141 } |
|
e8b0b0392037
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diff
changeset
|
3142 |
|
e8b0b0392037
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diff
changeset
|
3143 ~PrintRSetsClosure() { |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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diff
changeset
|
3144 gclog_or_tty->print_cr("Occupied Sum: "SIZE_FORMAT, _occupied_sum); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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diff
changeset
|
3145 gclog_or_tty->print_cr("========================================"); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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diff
changeset
|
3146 gclog_or_tty->cr(); |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
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3774
diff
changeset
|
3147 } |
|
e8b0b0392037
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diff
changeset
|
3148 }; |
|
e8b0b0392037
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changeset
|
3149 |
|
e8b0b0392037
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changeset
|
3150 void G1CollectedHeap::print_cset_rsets() { |
|
e8b0b0392037
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diff
changeset
|
3151 PrintRSetsClosure cl("Printing CSet RSets"); |
|
e8b0b0392037
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tonyp
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3774
diff
changeset
|
3152 collection_set_iterate(&cl); |
|
e8b0b0392037
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3774
diff
changeset
|
3153 } |
|
e8b0b0392037
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changeset
|
3154 |
|
e8b0b0392037
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changeset
|
3155 void G1CollectedHeap::print_all_rsets() { |
|
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3156 PrintRSetsClosure cl("Printing All RSets");; |
|
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|
3157 heap_region_iterate(&cl); |
|
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|
3158 } |
|
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|
3159 #endif // PRODUCT |
|
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|
3160 |
| 342 | 3161 G1CollectedHeap* G1CollectedHeap::heap() { |
| 3162 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
| 3163 "not a garbage-first heap"); | |
| 3164 return _g1h; | |
| 3165 } | |
| 3166 | |
| 3167 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
|
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|
3168 // always_do_update_barrier = false; |
| 342 | 3169 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
| 3170 // Call allocation profiler | |
| 3171 AllocationProfiler::iterate_since_last_gc(); | |
| 3172 // Fill TLAB's and such | |
| 3173 ensure_parsability(true); | |
| 3174 } | |
| 3175 | |
| 3176 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
| 3177 // FIXME: what is this about? | |
| 3178 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
| 3179 // is set. | |
| 3180 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
| 3181 "derived pointer present")); | |
|
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3182 // always_do_update_barrier = true; |
|
3979
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|
3183 |
|
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|
3184 // We have just completed a GC. Update the soft reference |
|
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|
3185 // policy with the new heap occupancy |
|
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|
3186 Universe::update_heap_info_at_gc(); |
| 342 | 3187 } |
| 3188 | |
| 1973 | 3189 HeapWord* G1CollectedHeap::do_collection_pause(size_t word_size, |
| 3190 unsigned int gc_count_before, | |
| 3191 bool* succeeded) { | |
| 3192 assert_heap_not_locked_and_not_at_safepoint(); | |
| 342 | 3193 g1_policy()->record_stop_world_start(); |
| 1973 | 3194 VM_G1IncCollectionPause op(gc_count_before, |
| 3195 word_size, | |
| 3196 false, /* should_initiate_conc_mark */ | |
| 3197 g1_policy()->max_pause_time_ms(), | |
| 3198 GCCause::_g1_inc_collection_pause); | |
| 3199 VMThread::execute(&op); | |
| 3200 | |
| 3201 HeapWord* result = op.result(); | |
| 3202 bool ret_succeeded = op.prologue_succeeded() && op.pause_succeeded(); | |
| 3203 assert(result == NULL || ret_succeeded, | |
| 3204 "the result should be NULL if the VM did not succeed"); | |
| 3205 *succeeded = ret_succeeded; | |
| 3206 | |
| 3207 assert_heap_not_locked(); | |
| 3208 return result; | |
| 342 | 3209 } |
| 3210 | |
| 3211 void | |
| 3212 G1CollectedHeap::doConcurrentMark() { | |
|
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3213 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
|
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|
3214 if (!_cmThread->in_progress()) { |
|
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|
3215 _cmThread->set_started(); |
|
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|
3216 CGC_lock->notify(); |
| 342 | 3217 } |
| 3218 } | |
| 3219 | |
| 3220 // <NEW PREDICTION> | |
| 3221 | |
| 3222 double G1CollectedHeap::predict_region_elapsed_time_ms(HeapRegion *hr, | |
| 3223 bool young) { | |
| 3224 return _g1_policy->predict_region_elapsed_time_ms(hr, young); | |
| 3225 } | |
| 3226 | |
| 3227 void G1CollectedHeap::check_if_region_is_too_expensive(double | |
| 3228 predicted_time_ms) { | |
| 3229 _g1_policy->check_if_region_is_too_expensive(predicted_time_ms); | |
| 3230 } | |
| 3231 | |
| 3232 size_t G1CollectedHeap::pending_card_num() { | |
| 3233 size_t extra_cards = 0; | |
| 3234 JavaThread *curr = Threads::first(); | |
| 3235 while (curr != NULL) { | |
| 3236 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
| 3237 extra_cards += dcq.size(); | |
| 3238 curr = curr->next(); | |
| 3239 } | |
| 3240 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 3241 size_t buffer_size = dcqs.buffer_size(); | |
| 3242 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 3243 return buffer_size * buffer_num + extra_cards; | |
| 3244 } | |
| 3245 | |
| 3246 size_t G1CollectedHeap::max_pending_card_num() { | |
| 3247 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 3248 size_t buffer_size = dcqs.buffer_size(); | |
| 3249 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 3250 int thread_num = Threads::number_of_threads(); | |
| 3251 return (buffer_num + thread_num) * buffer_size; | |
| 3252 } | |
| 3253 | |
| 3254 size_t G1CollectedHeap::cards_scanned() { | |
| 1861 | 3255 return g1_rem_set()->cardsScanned(); |
| 342 | 3256 } |
| 3257 | |
| 3258 void | |
| 3259 G1CollectedHeap::setup_surviving_young_words() { | |
| 3260 guarantee( _surviving_young_words == NULL, "pre-condition" ); | |
| 3261 size_t array_length = g1_policy()->young_cset_length(); | |
| 3262 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, array_length); | |
| 3263 if (_surviving_young_words == NULL) { | |
| 3264 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
| 3265 "Not enough space for young surv words summary."); | |
| 3266 } | |
| 3267 memset(_surviving_young_words, 0, array_length * sizeof(size_t)); | |
|
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|
3268 #ifdef ASSERT |
| 342 | 3269 for (size_t i = 0; i < array_length; ++i) { |
|
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|
3270 assert( _surviving_young_words[i] == 0, "memset above" ); |
|
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|
3271 } |
|
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|
3272 #endif // !ASSERT |
| 342 | 3273 } |
| 3274 | |
| 3275 void | |
| 3276 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
| 3277 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 3278 size_t array_length = g1_policy()->young_cset_length(); | |
| 3279 for (size_t i = 0; i < array_length; ++i) | |
| 3280 _surviving_young_words[i] += surv_young_words[i]; | |
| 3281 } | |
| 3282 | |
| 3283 void | |
| 3284 G1CollectedHeap::cleanup_surviving_young_words() { | |
| 3285 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
| 3286 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
| 3287 _surviving_young_words = NULL; | |
| 3288 } | |
| 3289 | |
| 3290 // </NEW PREDICTION> | |
| 3291 | |
|
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|
3292 #ifdef ASSERT |
|
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|
3293 class VerifyCSetClosure: public HeapRegionClosure { |
|
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|
3294 public: |
|
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|
3295 bool doHeapRegion(HeapRegion* hr) { |
|
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|
3296 // Here we check that the CSet region's RSet is ready for parallel |
|
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|
3297 // iteration. The fields that we'll verify are only manipulated |
|
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|
3298 // when the region is part of a CSet and is collected. Afterwards, |
|
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|
3299 // we reset these fields when we clear the region's RSet (when the |
|
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|
3300 // region is freed) so they are ready when the region is |
|
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|
3301 // re-allocated. The only exception to this is if there's an |
|
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|
3302 // evacuation failure and instead of freeing the region we leave |
|
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|
3303 // it in the heap. In that case, we reset these fields during |
|
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|
3304 // evacuation failure handling. |
|
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|
3305 guarantee(hr->rem_set()->verify_ready_for_par_iteration(), "verification"); |
|
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|
3306 |
|
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changeset
|
3307 // Here's a good place to add any other checks we'd like to |
|
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|
3308 // perform on CSet regions. |
|
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
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diff
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|
3309 return false; |
|
0414c1049f15
6923991: G1: improve scalability of RSet scanning
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diff
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|
3310 } |
|
0414c1049f15
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|
3311 }; |
|
3777
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|
3312 #endif // ASSERT |
|
1261
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|
3313 |
| 1709 | 3314 #if TASKQUEUE_STATS |
| 3315 void G1CollectedHeap::print_taskqueue_stats_hdr(outputStream* const st) { | |
| 3316 st->print_raw_cr("GC Task Stats"); | |
| 3317 st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); | |
| 3318 st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); | |
| 3319 } | |
| 3320 | |
| 3321 void G1CollectedHeap::print_taskqueue_stats(outputStream* const st) const { | |
| 3322 print_taskqueue_stats_hdr(st); | |
| 3323 | |
| 3324 TaskQueueStats totals; | |
|
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3325 const int n = workers() != NULL ? workers()->total_workers() : 1; |
| 1709 | 3326 for (int i = 0; i < n; ++i) { |
| 3327 st->print("%3d ", i); task_queue(i)->stats.print(st); st->cr(); | |
| 3328 totals += task_queue(i)->stats; | |
| 3329 } | |
| 3330 st->print_raw("tot "); totals.print(st); st->cr(); | |
| 3331 | |
| 3332 DEBUG_ONLY(totals.verify()); | |
| 3333 } | |
| 3334 | |
| 3335 void G1CollectedHeap::reset_taskqueue_stats() { | |
|
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
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diff
changeset
|
3336 const int n = workers() != NULL ? workers()->total_workers() : 1; |
| 1709 | 3337 for (int i = 0; i < n; ++i) { |
| 3338 task_queue(i)->stats.reset(); | |
| 3339 } | |
| 3340 } | |
| 3341 #endif // TASKQUEUE_STATS | |
| 3342 | |
| 1973 | 3343 bool |
|
1656
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6944166: G1: explicit GCs are not always handled correctly
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|
3344 G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { |
| 2152 | 3345 assert_at_safepoint(true /* should_be_vm_thread */); |
| 3346 guarantee(!is_gc_active(), "collection is not reentrant"); | |
| 3347 | |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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diff
changeset
|
3348 if (GC_locker::check_active_before_gc()) { |
| 1973 | 3349 return false; |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
3350 } |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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changeset
|
3351 |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
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diff
changeset
|
3352 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
|
2039
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
tonyp
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diff
changeset
|
3353 ResourceMark rm; |
|
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
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|
3354 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3355 if (PrintHeapAtGC) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3356 Universe::print_heap_before_gc(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3357 } |
|
0316eac49d5a
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|
3358 |
| 2152 | 3359 verify_region_sets_optional(); |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
changeset
|
3360 verify_dirty_young_regions(); |
| 2152 | 3361 |
|
838
0316eac49d5a
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|
3362 { |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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changeset
|
3363 // 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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changeset
|
3364 // pause. If it is, during_initial_mark_pause() will return true |
|
23b1b27ac76c
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changeset
|
3365 // for the duration of this pause. |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
3366 g1_policy()->decide_on_conc_mark_initiation(); |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
3367 |
|
3982
273b46400613
7086533: G1: assert(!_g1->is_obj_dead(obj)): We should not be preserving dead objs: g1CollectedHeap.cpp:3835
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diff
changeset
|
3368 // We do not allow initial-mark to be piggy-backed on a |
|
273b46400613
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changeset
|
3369 // 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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|
3370 assert(!g1_policy()->during_initial_mark_pause() || |
|
273b46400613
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|
3371 g1_policy()->full_young_gcs(), "sanity"); |
|
273b46400613
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|
3372 |
|
273b46400613
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diff
changeset
|
3373 // We also do not allow partially-young GCs during marking. |
|
273b46400613
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|
3374 assert(!mark_in_progress() || g1_policy()->full_young_gcs(), "sanity"); |
|
273b46400613
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|
3375 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3376 char verbose_str[128]; |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3377 sprintf(verbose_str, "GC pause "); |
|
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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3830
diff
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|
3378 if (g1_policy()->full_young_gcs()) { |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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diff
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|
3379 strcat(verbose_str, "(young)"); |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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diff
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|
3380 } else { |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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diff
changeset
|
3381 strcat(verbose_str, "(partial)"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3382 } |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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diff
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|
3383 if (g1_policy()->during_initial_mark_pause()) { |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3384 strcat(verbose_str, " (initial-mark)"); |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3385 // 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
|
3386 // full collection counter. |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3387 increment_total_full_collections(); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3388 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3389 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3390 // 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
|
3391 // 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
|
3392 // is messy if we do. |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3393 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3394 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3395 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
|
3396 |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3397 TraceCollectorStats tcs(g1mm()->incremental_collection_counters()); |
|
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
3398 TraceMemoryManagerStats tms(false /* fullGC */, gc_cause()); |
|
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3399 |
| 2361 | 3400 // If the secondary_free_list is not empty, append it to the |
| 3401 // free_list. No need to wait for the cleanup operation to finish; | |
| 3402 // the region allocation code will check the secondary_free_list | |
| 3403 // and wait if necessary. If the G1StressConcRegionFreeing flag is | |
| 3404 // set, skip this step so that the region allocation code has to | |
| 3405 // get entries from the secondary_free_list. | |
| 2152 | 3406 if (!G1StressConcRegionFreeing) { |
| 2361 | 3407 append_secondary_free_list_if_not_empty_with_lock(); |
| 2152 | 3408 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3409 |
|
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3410 assert(check_young_list_well_formed(), |
|
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3411 "young list should be well formed"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3412 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3413 { // 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
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diff
changeset
|
3414 IsGCActiveMark x; |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3415 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
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diff
changeset
|
3416 gc_prologue(false); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3417 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
|
3418 increment_gc_time_stamp(); |
| 342 | 3419 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
changeset
|
3420 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3421 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
|
3422 gclog_or_tty->print(" VerifyBeforeGC:"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3423 prepare_for_verify(); |
|
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3424 Universe::verify(/* allow dirty */ false, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3425 /* silent */ false, |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3426 /* option */ VerifyOption_G1UsePrevMarking); |
|
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3427 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3428 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3429 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3430 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3431 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3432 // Please see comment in g1CollectedHeap.hpp and |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3433 // G1CollectedHeap::ref_processing_init() to see how |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3434 // reference processing currently works in G1. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3435 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3436 // Enable discovery in the STW reference processor |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3437 ref_processor_stw()->enable_discovery(true /*verify_disabled*/, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3438 true /*verify_no_refs*/); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3439 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3440 { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3441 // We want to temporarily turn off discovery by the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3442 // CM ref processor, if necessary, and turn it back on |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3443 // on again later if we do. Using a scoped |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3444 // NoRefDiscovery object will do this. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3445 NoRefDiscovery no_cm_discovery(ref_processor_cm()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3446 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3447 // 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
|
3448 // of the collection set!). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3449 release_mutator_alloc_region(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3450 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3451 // We should call this after we retire the mutator alloc |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3452 // region(s) so that all the ALLOC / RETIRE events are generated |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3453 // before the start GC event. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3454 _hr_printer.start_gc(false /* full */, (size_t) total_collections()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3455 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3456 // The elapsed time induced by the start time below deliberately elides |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3457 // the possible verification above. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3458 double start_time_sec = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3459 size_t start_used_bytes = used(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3460 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3461 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3462 gclog_or_tty->print_cr("\nBefore recording pause start.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3463 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3464 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
|
3465 #endif // YOUNG_LIST_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3466 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3467 g1_policy()->record_collection_pause_start(start_time_sec, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3468 start_used_bytes); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3469 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3470 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3471 gclog_or_tty->print_cr("\nAfter recording pause start.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3472 _young_list->print(); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3473 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3474 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3475 if (g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3476 concurrent_mark()->checkpointRootsInitialPre(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3477 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3478 perm_gen()->save_marks(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3479 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3480 // We must do this before any possible evacuation that should propagate |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3481 // marks. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3482 if (mark_in_progress()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3483 double start_time_sec = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3484 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3485 _cm->drainAllSATBBuffers(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3486 double finish_mark_ms = (os::elapsedTime() - start_time_sec) * 1000.0; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3487 g1_policy()->record_satb_drain_time(finish_mark_ms); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3488 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3489 // 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
|
3490 // only iterate over these. (Since evacuation may add to the mark |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3491 // stack, doing more exposes race conditions.) If no mark is in |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3492 // progress, this will be zero. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3493 _cm->set_oops_do_bound(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3494 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3495 if (mark_in_progress()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3496 concurrent_mark()->newCSet(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3497 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3498 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3499 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3500 gclog_or_tty->print_cr("\nBefore choosing collection set.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3501 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3502 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
|
3503 #endif // YOUNG_LIST_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3504 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3505 g1_policy()->choose_collection_set(target_pause_time_ms); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3506 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3507 if (_hr_printer.is_active()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3508 HeapRegion* hr = g1_policy()->collection_set(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3509 while (hr != NULL) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3510 G1HRPrinter::RegionType type; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3511 if (!hr->is_young()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3512 type = G1HRPrinter::Old; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3513 } else if (hr->is_survivor()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3514 type = G1HRPrinter::Survivor; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3515 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3516 type = G1HRPrinter::Eden; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3517 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3518 _hr_printer.cset(hr); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3519 hr = hr->next_in_collection_set(); |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3520 } |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3521 } |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3522 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3523 // We have chosen the complete collection set. If marking is |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3524 // active then, we clear the region fields of any of the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3525 // concurrent marking tasks whose region fields point into |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3526 // the collection set as these values will become stale. This |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3527 // will cause the owning marking threads to claim a new region |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3528 // when marking restarts. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3529 if (mark_in_progress()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3530 concurrent_mark()->reset_active_task_region_fields_in_cset(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3531 } |
|
3378
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3532 |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3533 #ifdef ASSERT |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3534 VerifyCSetClosure cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3535 collection_set_iterate(&cl); |
|
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3536 #endif // ASSERT |
| 1707 | 3537 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3538 setup_surviving_young_words(); |
|
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 // Initialize the GC alloc regions. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3541 init_gc_alloc_regions(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3542 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3543 // Actually do the work... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3544 evacuate_collection_set(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3545 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3546 free_collection_set(g1_policy()->collection_set()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3547 g1_policy()->clear_collection_set(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3548 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3549 cleanup_surviving_young_words(); |
|
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 // Start a new incremental collection set for the next pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3552 g1_policy()->start_incremental_cset_building(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3553 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3554 // Clear the _cset_fast_test bitmap in anticipation of adding |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3555 // regions to the incremental collection set for the next |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3556 // evacuation pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3557 clear_cset_fast_test(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3558 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3559 _young_list->reset_sampled_info(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3560 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3561 // Don't check the whole heap at this point as the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3562 // GC alloc regions from this pause have been tagged |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3563 // as survivors and moved on to the survivor list. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3564 // Survivor regions will fail the !is_young() check. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3565 assert(check_young_list_empty(false /* check_heap */), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3566 "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
|
3567 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3568 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3569 gclog_or_tty->print_cr("Before recording survivors.\nYoung List:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3570 _young_list->print(); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3571 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3572 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3573 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3574 _young_list->first_survivor_region(), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3575 _young_list->last_survivor_region()); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3576 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3577 _young_list->reset_auxilary_lists(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3578 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3579 if (evacuation_failed()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3580 _summary_bytes_used = recalculate_used(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3581 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3582 // The "used" of the the collection set have already been subtracted |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3583 // when they were freed. Add in the bytes evacuated. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3584 _summary_bytes_used += g1_policy()->bytes_copied_during_gc(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3585 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3586 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3587 if (g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3588 concurrent_mark()->checkpointRootsInitialPost(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3589 set_marking_started(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3590 // CAUTION: after the doConcurrentMark() call below, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3591 // the concurrent marking thread(s) could be running |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3592 // concurrently with us. Make sure that anything after |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3593 // 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
|
3594 // running. Note: of course, the actual marking work will |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3595 // not start until the safepoint itself is released in |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3596 // ConcurrentGCThread::safepoint_desynchronize(). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3597 doConcurrentMark(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3598 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3599 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3600 allocate_dummy_regions(); |
|
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
3601 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3602 #if YOUNG_LIST_VERBOSE |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3603 gclog_or_tty->print_cr("\nEnd of the pause.\nYoung_list:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3604 _young_list->print(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3605 g1_policy()->print_collection_set(g1_policy()->inc_cset_head(), gclog_or_tty); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3606 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3607 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3608 init_mutator_alloc_region(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3609 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3610 { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3611 size_t expand_bytes = g1_policy()->expansion_amount(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3612 if (expand_bytes > 0) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3613 size_t bytes_before = capacity(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3614 if (!expand(expand_bytes)) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3615 // We failed to expand the heap so let's verify that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3616 // committed/uncommitted amount match the backing store |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3617 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3618 assert(max_capacity() == _g1_storage.reserved_size(), "reserved size mismatch"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3619 } |
|
3920
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3620 } |
|
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
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 double end_time_sec = os::elapsedTime(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3624 double pause_time_ms = (end_time_sec - start_time_sec) * MILLIUNITS; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3625 g1_policy()->record_pause_time_ms(pause_time_ms); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3626 g1_policy()->record_collection_pause_end(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3627 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3628 MemoryService::track_memory_usage(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3629 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3630 // 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
|
3631 // update buffers to bring the RSets up-to-date if |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3632 // G1HRRSFlushLogBuffersOnVerify has been set. While scanning |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3633 // 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
|
3634 // regions we just allocated to (i.e., the GC alloc |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3635 // regions). However, during the last GC we called |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3636 // set_saved_mark() on all the GC alloc regions, so card |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3637 // scanning might skip the [saved_mark_word()...top()] area of |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3638 // those regions (i.e., the area we allocated objects into |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3639 // during the last GC). But it shouldn't. Given that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3640 // saved_mark_word() is conditional on whether the GC time stamp |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3641 // 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
|
3642 // 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
|
3643 // regions and saved_mark_word() will simply return top() for |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3644 // 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
|
3645 // than iterating over the regions and fixing them. In fact, the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3646 // GC time stamp increment here also ensures that |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3647 // saved_mark_word() will return top() between pauses, i.e., |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3648 // during concurrent refinement. So we don't need the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3649 // is_gc_active() check to decided which top to use when |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3650 // scanning cards (see CR 7039627). |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3651 increment_gc_time_stamp(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3652 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3653 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3654 HandleMark hm; // Discard invalid handles created during verification |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3655 gclog_or_tty->print(" VerifyAfterGC:"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3656 prepare_for_verify(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3657 Universe::verify(/* allow dirty */ true, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3658 /* silent */ false, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3659 /* option */ VerifyOption_G1UsePrevMarking); |
|
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 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3662 assert(!ref_processor_stw()->discovery_enabled(), "Postcondition"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3663 ref_processor_stw()->verify_no_references_recorded(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3664 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
3665 // 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
|
3666 } |
|
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3667 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3668 { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3669 size_t expand_bytes = g1_policy()->expansion_amount(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3670 if (expand_bytes > 0) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3671 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
|
3672 // 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
|
3673 // 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
|
3674 if (!expand(expand_bytes)) { |
|
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3675 // 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
|
3676 // committed/uncommitted amount match the backing store |
|
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3677 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
|
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3678 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
|
3679 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3680 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3681 } |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3682 |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3683 // 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
|
3684 // 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
|
3685 // 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
|
3686 // RETIRE events are generated before the end GC event. |
|
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3687 _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
|
3688 |
|
3764
053d84a76d3d
7032531: G1: enhance GC logging to include more accurate eden / survivor size transitions
tonyp
parents:
3378
diff
changeset
|
3689 // 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
|
3690 g1_policy()->print_heap_transition(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3691 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3692 if (mark_in_progress()) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3693 concurrent_mark()->update_g1_committed(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3694 } |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3695 |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3696 #ifdef TRACESPINNING |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3697 ParallelTaskTerminator::print_termination_counts(); |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3698 #endif |
| 342 | 3699 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3700 gc_epilogue(false); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3701 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3702 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3703 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3704 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
|
3705 print_tracing_info(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3706 vm_exit(-1); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3707 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3708 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3709 |
| 3766 | 3710 _hrs.verify_optional(); |
| 2152 | 3711 verify_region_sets_optional(); |
| 3712 | |
| 1709 | 3713 TASKQUEUE_STATS_ONLY(if (ParallelGCVerbose) print_taskqueue_stats()); |
| 3714 TASKQUEUE_STATS_ONLY(reset_taskqueue_stats()); | |
| 3715 | |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3716 if (PrintHeapAtGC) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3717 Universe::print_heap_after_gc(); |
| 342 | 3718 } |
|
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
parents:
3979
diff
changeset
|
3719 g1mm()->update_sizes(); |
|
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3720 |
|
884
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3721 if (G1SummarizeRSetStats && |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3722 (G1SummarizeRSetStatsPeriod > 0) && |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3723 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3724 g1_rem_set()->print_summary_info(); |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3725 } |
| 1973 | 3726 |
| 3727 return true; | |
| 342 | 3728 } |
| 3729 | |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3730 size_t G1CollectedHeap::desired_plab_sz(GCAllocPurpose purpose) |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3731 { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3732 size_t gclab_word_size; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3733 switch (purpose) { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3734 case GCAllocForSurvived: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3735 gclab_word_size = YoungPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3736 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3737 case GCAllocForTenured: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3738 gclab_word_size = OldPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3739 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3740 default: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3741 assert(false, "unknown GCAllocPurpose"); |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3742 gclab_word_size = OldPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3743 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3744 } |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3745 return gclab_word_size; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3746 } |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3747 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3748 void G1CollectedHeap::init_mutator_alloc_region() { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3749 assert(_mutator_alloc_region.get() == NULL, "pre-condition"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3750 _mutator_alloc_region.init(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3751 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3752 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3753 void G1CollectedHeap::release_mutator_alloc_region() { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3754 _mutator_alloc_region.release(); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3755 assert(_mutator_alloc_region.get() == NULL, "post-condition"); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3756 } |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3757 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3758 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
|
3759 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
|
3760 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3761 _survivor_gc_alloc_region.init(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3762 _old_gc_alloc_region.init(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3763 HeapRegion* retained_region = _retained_old_gc_alloc_region; |
|
f44782f04dd4
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|
3764 _retained_old_gc_alloc_region = NULL; |
|
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|
3765 |
|
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|
3766 // We will discard the current GC alloc region if: |
|
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|
3767 // a) it's in the collection set (it can happen!), |
|
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|
3768 // b) it's already full (no point in using it), |
|
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|
3769 // c) it's empty (this means that it was emptied during |
|
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|
3770 // a cleanup and it should be on the free list now), or |
|
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|
3771 // d) it's humongous (this means that it was emptied |
|
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|
3772 // during a cleanup and was added to the free list, but |
|
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|
3773 // has been subseqently used to allocate a humongous |
|
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|
3774 // object that may be less than the region size). |
|
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|
3775 if (retained_region != NULL && |
|
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|
3776 !retained_region->in_collection_set() && |
|
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|
3777 !(retained_region->top() == retained_region->end()) && |
|
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|
3778 !retained_region->is_empty() && |
|
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|
3779 !retained_region->isHumongous()) { |
|
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|
3780 retained_region->set_saved_mark(); |
|
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|
3781 _old_gc_alloc_region.set(retained_region); |
|
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|
3782 _hr_printer.reuse(retained_region); |
| 342 | 3783 } |
| 3784 } | |
| 3785 | |
|
3830
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|
3786 void G1CollectedHeap::release_gc_alloc_regions() { |
|
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|
3787 _survivor_gc_alloc_region.release(); |
|
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|
3788 // If we have an old GC alloc region to release, we'll save it in |
|
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|
3789 // _retained_old_gc_alloc_region. If we don't |
|
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|
3790 // _retained_old_gc_alloc_region will become NULL. This is what we |
|
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|
3791 // want either way so no reason to check explicitly for either |
|
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|
3792 // condition. |
|
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|
3793 _retained_old_gc_alloc_region = _old_gc_alloc_region.release(); |
| 342 | 3794 } |
| 3795 | |
|
3830
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|
3796 void G1CollectedHeap::abandon_gc_alloc_regions() { |
|
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|
3797 assert(_survivor_gc_alloc_region.get() == NULL, "pre-condition"); |
|
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|
3798 assert(_old_gc_alloc_region.get() == NULL, "pre-condition"); |
|
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|
3799 _retained_old_gc_alloc_region = NULL; |
| 342 | 3800 } |
| 3801 | |
| 3802 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
| 3803 _drain_in_progress = false; | |
| 3804 set_evac_failure_closure(cl); | |
| 3805 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 3806 } | |
| 3807 | |
| 3808 void G1CollectedHeap::finalize_for_evac_failure() { | |
| 3809 assert(_evac_failure_scan_stack != NULL && | |
| 3810 _evac_failure_scan_stack->length() == 0, | |
| 3811 "Postcondition"); | |
| 3812 assert(!_drain_in_progress, "Postcondition"); | |
| 1045 | 3813 delete _evac_failure_scan_stack; |
| 342 | 3814 _evac_failure_scan_stack = NULL; |
| 3815 } | |
| 3816 | |
|
616
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|
3817 class UpdateRSetDeferred : public OopsInHeapRegionClosure { |
|
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|
3818 private: |
|
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|
3819 G1CollectedHeap* _g1; |
|
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|
3820 DirtyCardQueue *_dcq; |
|
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|
3821 CardTableModRefBS* _ct_bs; |
|
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|
3822 |
|
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|
3823 public: |
|
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|
3824 UpdateRSetDeferred(G1CollectedHeap* g1, DirtyCardQueue* dcq) : |
|
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|
3825 _g1(g1), _ct_bs((CardTableModRefBS*)_g1->barrier_set()), _dcq(dcq) {} |
|
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|
3826 |
|
845
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diff
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|
3827 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
df6caf649ff7
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diff
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|
3828 virtual void do_oop( oop* p) { do_oop_work(p); } |
|
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|
3829 template <class T> void do_oop_work(T* p) { |
|
616
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|
3830 assert(_from->is_in_reserved(p), "paranoia"); |
|
845
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parents:
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diff
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|
3831 if (!_from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && |
|
df6caf649ff7
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diff
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|
3832 !_from->is_survivor()) { |
|
616
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|
3833 size_t card_index = _ct_bs->index_for(p); |
|
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|
3834 if (_ct_bs->mark_card_deferred(card_index)) { |
|
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|
3835 _dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index)); |
|
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|
3836 } |
|
4f360ec815ba
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|
3837 } |
|
4f360ec815ba
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|
3838 } |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
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|
3839 }; |
|
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|
3840 |
| 342 | 3841 class RemoveSelfPointerClosure: public ObjectClosure { |
| 3842 private: | |
| 3843 G1CollectedHeap* _g1; | |
| 3844 ConcurrentMark* _cm; | |
| 3845 HeapRegion* _hr; | |
| 3846 size_t _prev_marked_bytes; | |
| 3847 size_t _next_marked_bytes; | |
|
616
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|
3848 OopsInHeapRegionClosure *_cl; |
| 342 | 3849 public: |
|
2133
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|
3850 RemoveSelfPointerClosure(G1CollectedHeap* g1, HeapRegion* hr, |
|
2250ee17e258
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|
3851 OopsInHeapRegionClosure* cl) : |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
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2039
diff
changeset
|
3852 _g1(g1), _hr(hr), _cm(_g1->concurrent_mark()), _prev_marked_bytes(0), |
|
616
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|
3853 _next_marked_bytes(0), _cl(cl) {} |
| 342 | 3854 |
| 3855 size_t prev_marked_bytes() { return _prev_marked_bytes; } | |
| 3856 size_t next_marked_bytes() { return _next_marked_bytes; } | |
| 3857 | |
|
2133
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2039
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|
3858 // <original comment> |
|
352
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iveresov
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diff
changeset
|
3859 // The original idea here was to coalesce evacuated and dead objects. |
|
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|
3860 // However that caused complications with the block offset table (BOT). |
|
e0c09f7ec5c4
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diff
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|
3861 // In particular if there were two TLABs, one of them partially refined. |
|
e0c09f7ec5c4
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|
3862 // |----- TLAB_1--------|----TLAB_2-~~~(partially refined part)~~~| |
|
e0c09f7ec5c4
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|
3863 // The BOT entries of the unrefined part of TLAB_2 point to the start |
|
e0c09f7ec5c4
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|
3864 // of TLAB_2. If the last object of the TLAB_1 and the first object |
|
e0c09f7ec5c4
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|
3865 // of TLAB_2 are coalesced, then the cards of the unrefined part |
|
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diff
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|
3866 // would point into middle of the filler object. |
|
2133
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|
3867 // 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
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|
3868 // </original comment> |
|
352
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6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
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|
3869 // |
|
2133
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changeset
|
3870 // We now reset the BOT when we start the object iteration over the |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
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2039
diff
changeset
|
3871 // region and refine its entries for every object we come across. So |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
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diff
changeset
|
3872 // the above comment is not really relevant and we should be able |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
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2039
diff
changeset
|
3873 // to coalesce dead objects if we want to. |
|
352
e0c09f7ec5c4
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diff
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|
3874 void do_object(oop obj) { |
|
2133
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2039
diff
changeset
|
3875 HeapWord* obj_addr = (HeapWord*) obj; |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3876 assert(_hr->is_in(obj_addr), "sanity"); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3877 size_t obj_size = obj->size(); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3878 _hr->update_bot_for_object(obj_addr, obj_size); |
|
352
e0c09f7ec5c4
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diff
changeset
|
3879 if (obj->is_forwarded() && obj->forwardee() == obj) { |
|
e0c09f7ec5c4
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diff
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|
3880 // The object failed to move. |
|
e0c09f7ec5c4
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changeset
|
3881 assert(!_g1->is_obj_dead(obj), "We should not be preserving dead objs."); |
|
e0c09f7ec5c4
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|
3882 _cm->markPrev(obj); |
|
e0c09f7ec5c4
6702387: G1: assertion failure: assert(p == current_top || oop(p)->is_oop(),"p is not a block start")
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diff
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|
3883 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
|
2133
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|
3884 _prev_marked_bytes += (obj_size * HeapWordSize); |
|
352
e0c09f7ec5c4
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diff
changeset
|
3885 if (_g1->mark_in_progress() && !_g1->is_obj_ill(obj)) { |
|
e0c09f7ec5c4
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|
3886 _cm->markAndGrayObjectIfNecessary(obj); |
|
e0c09f7ec5c4
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|
3887 } |
|
e0c09f7ec5c4
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changeset
|
3888 obj->set_mark(markOopDesc::prototype()); |
|
e0c09f7ec5c4
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diff
changeset
|
3889 // While we were processing RSet buffers during the |
|
e0c09f7ec5c4
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changeset
|
3890 // collection, we actually didn't scan any cards on the |
|
e0c09f7ec5c4
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changeset
|
3891 // collection set, since we didn't want to update remebered |
|
e0c09f7ec5c4
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diff
changeset
|
3892 // sets with entries that point into the collection set, given |
|
e0c09f7ec5c4
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diff
changeset
|
3893 // that live objects fromthe collection set are about to move |
|
e0c09f7ec5c4
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changeset
|
3894 // and such entries will be stale very soon. This change also |
|
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|
3895 // dealt with a reliability issue which involved scanning a |
|
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diff
changeset
|
3896 // card in the collection set and coming across an array that |
|
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diff
changeset
|
3897 // was being chunked and looking malformed. The problem is |
|
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diff
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|
3898 // that, if evacuation fails, we might have remembered set |
|
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diff
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|
3899 // entries missing given that we skipped cards on the |
|
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diff
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|
3900 // collection set. So, we'll recreate such entries now. |
|
616
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diff
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|
3901 obj->oop_iterate(_cl); |
|
352
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diff
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|
3902 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
|
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diff
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|
3903 } else { |
|
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diff
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|
3904 // The object has been either evacuated or is dead. Fill it with a |
|
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diff
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|
3905 // dummy object. |
|
2133
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|
3906 MemRegion mr((HeapWord*)obj, obj_size); |
|
481
7d7a7c599c17
6578152: fill_region_with_object has usability and safety issues
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parents:
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diff
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|
3907 CollectedHeap::fill_with_object(mr); |
| 342 | 3908 _cm->clearRangeBothMaps(mr); |
| 3909 } | |
| 3910 } | |
| 3911 }; | |
| 3912 | |
| 3913 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
| 1705 | 3914 UpdateRSetImmediate immediate_update(_g1h->g1_rem_set()); |
|
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
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|
3915 DirtyCardQueue dcq(&_g1h->dirty_card_queue_set()); |
|
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6720309: G1: don't synchronously update RSet during evacuation pauses
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|
3916 UpdateRSetDeferred deferred_update(_g1h, &dcq); |
|
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|
3917 OopsInHeapRegionClosure *cl; |
|
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6720309: G1: don't synchronously update RSet during evacuation pauses
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|
3918 if (G1DeferredRSUpdate) { |
|
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6720309: G1: don't synchronously update RSet during evacuation pauses
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|
3919 cl = &deferred_update; |
|
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6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
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|
3920 } else { |
|
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|
3921 cl = &immediate_update; |
|
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6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
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|
3922 } |
| 342 | 3923 HeapRegion* cur = g1_policy()->collection_set(); |
| 3924 while (cur != NULL) { | |
| 3925 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
|
2133
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|
3926 assert(!cur->isHumongous(), "sanity"); |
|
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7007068: G1: refine the BOT during evac failure handling
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|
3927 |
| 342 | 3928 if (cur->evacuation_failed()) { |
| 3929 assert(cur->in_collection_set(), "bad CS"); | |
|
2133
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|
3930 RemoveSelfPointerClosure rspc(_g1h, cur, cl); |
|
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
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|
3931 |
|
3777
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|
3932 // In the common case we make sure that this is done when the |
|
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|
3933 // region is freed so that it is "ready-to-go" when it's |
|
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|
3934 // re-allocated. However, when evacuation failure happens, a |
|
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tonyp
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3774
diff
changeset
|
3935 // region will remain in the heap and might ultimately be added |
|
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7046182: G1: remove unnecessary iterations over the collection set
tonyp
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3774
diff
changeset
|
3936 // to a CSet in the future. So we have to be careful here and |
|
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3937 // make sure the region's RSet is ready for parallel iteration |
|
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tonyp
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diff
changeset
|
3938 // whenever this might be required in the future. |
|
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7046182: G1: remove unnecessary iterations over the collection set
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diff
changeset
|
3939 cur->rem_set()->reset_for_par_iteration(); |
|
2133
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|
3940 cur->reset_bot(); |
|
616
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diff
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|
3941 cl->set_region(cur); |
| 342 | 3942 cur->object_iterate(&rspc); |
| 3943 | |
| 3944 // A number of manipulations to make the TAMS be the current top, | |
| 3945 // and the marked bytes be the ones observed in the iteration. | |
| 3946 if (_g1h->concurrent_mark()->at_least_one_mark_complete()) { | |
| 3947 // The comments below are the postconditions achieved by the | |
| 3948 // calls. Note especially the last such condition, which says that | |
| 3949 // the count of marked bytes has been properly restored. | |
| 3950 cur->note_start_of_marking(false); | |
| 3951 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
| 3952 cur->add_to_marked_bytes(rspc.prev_marked_bytes()); | |
| 3953 // _next_marked_bytes == prev_marked_bytes. | |
| 3954 cur->note_end_of_marking(); | |
| 3955 // _prev_top_at_mark_start == top(), | |
| 3956 // _prev_marked_bytes == prev_marked_bytes | |
| 3957 } | |
| 3958 // If there is no mark in progress, we modified the _next variables | |
| 3959 // above needlessly, but harmlessly. | |
| 3960 if (_g1h->mark_in_progress()) { | |
| 3961 cur->note_start_of_marking(false); | |
| 3962 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
| 3963 // _next_marked_bytes == next_marked_bytes. | |
| 3964 } | |
| 3965 | |
| 3966 // Now make sure the region has the right index in the sorted array. | |
| 3967 g1_policy()->note_change_in_marked_bytes(cur); | |
| 3968 } | |
| 3969 cur = cur->next_in_collection_set(); | |
| 3970 } | |
| 3971 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
| 3972 | |
| 3973 // Now restore saved marks, if any. | |
| 3974 if (_objs_with_preserved_marks != NULL) { | |
| 3975 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
| 3976 guarantee(_objs_with_preserved_marks->length() == | |
| 3977 _preserved_marks_of_objs->length(), "Both or none."); | |
| 3978 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
| 3979 oop obj = _objs_with_preserved_marks->at(i); | |
| 3980 markOop m = _preserved_marks_of_objs->at(i); | |
| 3981 obj->set_mark(m); | |
| 3982 } | |
| 3983 // Delete the preserved marks growable arrays (allocated on the C heap). | |
| 3984 delete _objs_with_preserved_marks; | |
| 3985 delete _preserved_marks_of_objs; | |
| 3986 _objs_with_preserved_marks = NULL; | |
| 3987 _preserved_marks_of_objs = NULL; | |
| 3988 } | |
| 3989 } | |
| 3990 | |
| 3991 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
| 3992 _evac_failure_scan_stack->push(obj); | |
| 3993 } | |
| 3994 | |
| 3995 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
| 3996 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
| 3997 | |
| 3998 while (_evac_failure_scan_stack->length() > 0) { | |
| 3999 oop obj = _evac_failure_scan_stack->pop(); | |
| 4000 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
| 4001 obj->oop_iterate_backwards(_evac_failure_closure); | |
| 4002 } | |
| 4003 } | |
| 4004 | |
| 4005 oop | |
| 4006 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
|
3973
663cb89032b1
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johnc
parents:
3920
diff
changeset
|
4007 oop old, |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4008 bool should_mark_root) { |
|
3323
75af3e8de182
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tonyp
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3317
diff
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|
4009 assert(obj_in_cs(old), |
|
75af3e8de182
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parents:
3317
diff
changeset
|
4010 err_msg("obj: "PTR_FORMAT" should still be in the CSet", |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
tonyp
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3317
diff
changeset
|
4011 (HeapWord*) old)); |
| 342 | 4012 markOop m = old->mark(); |
| 4013 oop forward_ptr = old->forward_to_atomic(old); | |
| 4014 if (forward_ptr == NULL) { | |
| 4015 // Forward-to-self succeeded. | |
|
3973
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4016 |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4017 // should_mark_root will be true when this routine is called |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4018 // from a root scanning closure during an initial mark pause. |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4019 // In this case the thread that succeeds in self-forwarding the |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4020 // object is also responsible for marking the object. |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4021 if (should_mark_root) { |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4022 assert(!oopDesc::is_null(old), "shouldn't be"); |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4023 _cm->grayRoot(old); |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
johnc
parents:
3920
diff
changeset
|
4024 } |
|
663cb89032b1
7092412: G1: Some roots not marked during an initial mark that gets an evacuation failure
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parents:
3920
diff
changeset
|
4025 |
| 342 | 4026 if (_evac_failure_closure != cl) { |
| 4027 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
| 4028 assert(!_drain_in_progress, | |
| 4029 "Should only be true while someone holds the lock."); | |
| 4030 // Set the global evac-failure closure to the current thread's. | |
| 4031 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
| 4032 set_evac_failure_closure(cl); | |
| 4033 // Now do the common part. | |
| 4034 handle_evacuation_failure_common(old, m); | |
| 4035 // Reset to NULL. | |
| 4036 set_evac_failure_closure(NULL); | |
| 4037 } else { | |
| 4038 // The lock is already held, and this is recursive. | |
| 4039 assert(_drain_in_progress, "This should only be the recursive case."); | |
| 4040 handle_evacuation_failure_common(old, m); | |
| 4041 } | |
| 4042 return old; | |
| 4043 } else { | |
|
3323
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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3317
diff
changeset
|
4044 // Forward-to-self failed. Either someone else managed to allocate |
|
75af3e8de182
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tonyp
parents:
3317
diff
changeset
|
4045 // space for this object (old != forward_ptr) or they beat us in |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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3317
diff
changeset
|
4046 // self-forwarding it (old == forward_ptr). |
|
75af3e8de182
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parents:
3317
diff
changeset
|
4047 assert(old == forward_ptr || !obj_in_cs(forward_ptr), |
|
75af3e8de182
7040450: G1: assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj))) failed: shouldn't still be in ...
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parents:
3317
diff
changeset
|
4048 err_msg("obj: "PTR_FORMAT" forwarded to: "PTR_FORMAT" " |
|
75af3e8de182
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3317
diff
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|
4049 "should not be in the CSet", |
|
75af3e8de182
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3317
diff
changeset
|
4050 (HeapWord*) old, (HeapWord*) forward_ptr)); |
| 342 | 4051 return forward_ptr; |
| 4052 } | |
| 4053 } | |
| 4054 | |
| 4055 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
| 4056 set_evacuation_failed(true); | |
| 4057 | |
| 4058 preserve_mark_if_necessary(old, m); | |
| 4059 | |
| 4060 HeapRegion* r = heap_region_containing(old); | |
| 4061 if (!r->evacuation_failed()) { | |
| 4062 r->set_evacuation_failed(true); | |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
4063 _hr_printer.evac_failure(r); |
| 342 | 4064 } |
| 4065 | |
| 4066 push_on_evac_failure_scan_stack(old); | |
| 4067 | |
| 4068 if (!_drain_in_progress) { | |
| 4069 // prevent recursion in copy_to_survivor_space() | |
| 4070 _drain_in_progress = true; | |
| 4071 drain_evac_failure_scan_stack(); | |
| 4072 _drain_in_progress = false; | |
| 4073 } | |
| 4074 } | |
| 4075 | |
| 4076 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
|
2038
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
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parents:
2037
diff
changeset
|
4077 assert(evacuation_failed(), "Oversaving!"); |
|
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4078 // We want to call the "for_promotion_failure" version only in the |
|
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4079 // case of a promotion failure. |
|
74ee0db180fa
6807801: CMS: could save/restore fewer header words during scavenge
ysr
parents:
2037
diff
changeset
|
4080 if (m->must_be_preserved_for_promotion_failure(obj)) { |
| 342 | 4081 if (_objs_with_preserved_marks == NULL) { |
| 4082 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
| 4083 _objs_with_preserved_marks = | |
| 4084 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 4085 _preserved_marks_of_objs = | |
| 4086 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
| 4087 } | |
| 4088 _objs_with_preserved_marks->push(obj); | |
| 4089 _preserved_marks_of_objs->push(m); | |
| 4090 } | |
| 4091 } | |
| 4092 | |
| 4093 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
| 4094 size_t word_size) { | |
|
3830
f44782f04dd4
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3824
diff
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|
4095 if (purpose == GCAllocForSurvived) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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3824
diff
changeset
|
4096 HeapWord* result = survivor_attempt_allocation(word_size); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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3824
diff
changeset
|
4097 if (result != NULL) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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3824
diff
changeset
|
4098 return result; |
| 342 | 4099 } else { |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4100 // 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
|
4101 // object there. |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4102 return old_attempt_allocation(word_size); |
| 342 | 4103 } |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4104 } else { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4105 assert(purpose == GCAllocForTenured, "sanity"); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4106 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
|
4107 if (result != NULL) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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3824
diff
changeset
|
4108 return result; |
| 342 | 4109 } else { |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4110 // 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
|
4111 // object there. |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4112 return survivor_attempt_allocation(word_size); |
| 342 | 4113 } |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4114 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4115 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4116 ShouldNotReachHere(); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4117 // 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
|
4118 return NULL; |
| 342 | 4119 } |
| 4120 | |
| 4121 #ifndef PRODUCT | |
| 4122 bool GCLabBitMapClosure::do_bit(size_t offset) { | |
| 4123 HeapWord* addr = _bitmap->offsetToHeapWord(offset); | |
| 4124 guarantee(_cm->isMarked(oop(addr)), "it should be!"); | |
| 4125 return true; | |
| 4126 } | |
| 4127 #endif // PRODUCT | |
| 4128 | |
|
3886
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4129 G1ParGCAllocBuffer::G1ParGCAllocBuffer(size_t gclab_word_size) : |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4130 ParGCAllocBuffer(gclab_word_size), |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4131 _should_mark_objects(false), |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4132 _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
|
4133 _retired(false) |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4134 { |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4135 //_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
|
4136 // mark the forwarded location of an evacuated object. |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4137 // 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
|
4138 // 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
|
4139 // 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
|
4140 if (G1CollectedHeap::heap()->mark_in_progress() || |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4141 G1CollectedHeap::heap()->g1_policy()->during_initial_mark_pause()) { |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4142 _should_mark_objects = true; |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4143 } |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4144 } |
|
eeae91c9baba
7080389: G1: refactor marking code in evacuation pause copy closures
johnc
parents:
3869
diff
changeset
|
4145 |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4146 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
4147 : _g1h(g1h), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4148 _refs(g1h->task_queue(queue_num)), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4149 _dcq(&g1h->dirty_card_queue_set()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4150 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4151 _g1_rem(g1h->g1_rem_set()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
4152 _hash_seed(17), _queue_num(queue_num), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4153 _term_attempts(0), |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
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changeset
|
4154 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)), |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
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diff
changeset
|
4155 _tenured_alloc_buffer(g1h->desired_plab_sz(GCAllocForTenured)), |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4156 _age_table(false), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4157 _strong_roots_time(0), _term_time(0), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4158 _alloc_buffer_waste(0), _undo_waste(0) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4159 { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4160 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4161 // 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
|
4162 // non-young regions (where the age is -1) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4163 // 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
|
4164 // an attempt to eliminate cache contention |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4165 size_t real_length = 1 + _g1h->g1_policy()->young_cset_length(); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
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diff
changeset
|
4166 size_t array_length = PADDING_ELEM_NUM + |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4167 real_length + |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4168 PADDING_ELEM_NUM; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4169 _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:
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diff
changeset
|
4170 if (_surviving_young_words_base == NULL) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4171 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
|
4172 "Not enough space for young surv histo."); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4173 _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
|
4174 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
|
4175 |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4176 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4177 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
4178 |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4179 _start = os::elapsedTime(); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
4180 } |
| 342 | 4181 |
| 1709 | 4182 void |
| 4183 G1ParScanThreadState::print_termination_stats_hdr(outputStream* const st) | |
| 4184 { | |
| 4185 st->print_raw_cr("GC Termination Stats"); | |
| 4186 st->print_raw_cr(" elapsed --strong roots-- -------termination-------" | |
| 4187 " ------waste (KiB)------"); | |
| 4188 st->print_raw_cr("thr ms ms % ms % attempts" | |
| 4189 " total alloc undo"); | |
| 4190 st->print_raw_cr("--- --------- --------- ------ --------- ------ --------" | |
| 4191 " ------- ------- -------"); | |
| 4192 } | |
| 4193 | |
| 4194 void | |
| 4195 G1ParScanThreadState::print_termination_stats(int i, | |
| 4196 outputStream* const st) const | |
| 4197 { | |
| 4198 const double elapsed_ms = elapsed_time() * 1000.0; | |
| 4199 const double s_roots_ms = strong_roots_time() * 1000.0; | |
| 4200 const double term_ms = term_time() * 1000.0; | |
| 4201 st->print_cr("%3d %9.2f %9.2f %6.2f " | |
| 4202 "%9.2f %6.2f " SIZE_FORMAT_W(8) " " | |
| 4203 SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7), | |
| 4204 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
| 4205 term_ms, term_ms * 100 / elapsed_ms, term_attempts(), | |
| 4206 (alloc_buffer_waste() + undo_waste()) * HeapWordSize / K, | |
| 4207 alloc_buffer_waste() * HeapWordSize / K, | |
| 4208 undo_waste() * HeapWordSize / K); | |
| 4209 } | |
| 4210 | |
|
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4211 #ifdef ASSERT |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4212 bool G1ParScanThreadState::verify_ref(narrowOop* ref) const { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4213 assert(ref != NULL, "invariant"); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4214 assert(UseCompressedOops, "sanity"); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4215 assert(!has_partial_array_mask(ref), err_msg("ref=" PTR_FORMAT, ref)); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4216 oop p = oopDesc::load_decode_heap_oop(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4217 assert(_g1h->is_in_g1_reserved(p), |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4218 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4219 return true; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4220 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4221 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4222 bool G1ParScanThreadState::verify_ref(oop* ref) const { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4223 assert(ref != NULL, "invariant"); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4224 if (has_partial_array_mask(ref)) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4225 // Must be in the collection set--it's already been copied. |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4226 oop p = clear_partial_array_mask(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4227 assert(_g1h->obj_in_cs(p), |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4228 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4229 } else { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4230 oop p = oopDesc::load_decode_heap_oop(ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4231 assert(_g1h->is_in_g1_reserved(p), |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4232 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4233 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4234 return true; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4235 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4236 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4237 bool G1ParScanThreadState::verify_task(StarTask ref) const { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4238 if (ref.is_narrow()) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4239 return verify_ref((narrowOop*) ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4240 } else { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4241 return verify_ref((oop*) ref); |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4242 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4243 } |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4244 #endif // ASSERT |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4245 |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4246 void G1ParScanThreadState::trim_queue() { |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4247 assert(_evac_cl != NULL, "not set"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4248 assert(_evac_failure_cl != NULL, "not set"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4249 assert(_partial_scan_cl != NULL, "not set"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4250 |
|
1862
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4251 StarTask ref; |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4252 do { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4253 // Drain the overflow stack first, so other threads can steal. |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
parents:
1861
diff
changeset
|
4254 while (refs()->pop_overflow(ref)) { |
|
b14ec34b1e07
6989448: G1: refactor and simplify G1ParScanThreadState
jcoomes
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|
4255 deal_with_reference(ref); |
|
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|
4256 } |
|
3979
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|
4257 |
|
1862
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|
4258 while (refs()->pop_local(ref)) { |
|
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|
4259 deal_with_reference(ref); |
|
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|
4260 } |
|
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|
4261 } while (!refs()->is_empty()); |
|
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|
4262 } |
|
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|
4263 |
| 342 | 4264 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : |
| 4265 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), | |
|
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|
4266 _par_scan_state(par_scan_state), |
|
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|
4267 _during_initial_mark(_g1->g1_policy()->during_initial_mark_pause()), |
|
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4268 _mark_in_progress(_g1->mark_in_progress()) { } |
|
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4269 |
|
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|
4270 template <class T> void G1ParCopyHelper::mark_object(T* p) { |
|
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4271 // This is called from do_oop_work for objects that are not |
|
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4272 // in the collection set. Objects in the collection set |
|
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4273 // are marked after they have been evacuated. |
| 342 | 4274 |
|
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4275 T heap_oop = oopDesc::load_heap_oop(p); |
|
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|
4276 if (!oopDesc::is_null(heap_oop)) { |
|
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4277 oop obj = oopDesc::decode_heap_oop(heap_oop); |
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4278 HeapWord* addr = (HeapWord*)obj; |
|
3323
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|
4279 if (_g1->is_in_g1_reserved(addr)) { |
| 342 | 4280 _cm->grayRoot(oop(addr)); |
|
3323
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|
4281 } |
| 342 | 4282 } |
| 4283 } | |
| 4284 | |
|
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|
4285 oop G1ParCopyHelper::copy_to_survivor_space(oop old, bool should_mark_root, |
|
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|
4286 bool should_mark_copy) { |
| 342 | 4287 size_t word_sz = old->size(); |
| 4288 HeapRegion* from_region = _g1->heap_region_containing_raw(old); | |
| 4289 // +1 to make the -1 indexes valid... | |
| 4290 int young_index = from_region->young_index_in_cset()+1; | |
| 4291 assert( (from_region->is_young() && young_index > 0) || | |
| 4292 (!from_region->is_young() && young_index == 0), "invariant" ); | |
| 4293 G1CollectorPolicy* g1p = _g1->g1_policy(); | |
| 4294 markOop m = old->mark(); | |
| 545 | 4295 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
| 4296 : m->age(); | |
| 4297 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
| 342 | 4298 word_sz); |
| 4299 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
| 4300 oop obj = oop(obj_ptr); | |
| 4301 | |
| 4302 if (obj_ptr == NULL) { | |
| 4303 // This will either forward-to-self, or detect that someone else has | |
| 4304 // installed a forwarding pointer. | |
| 4305 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
|
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|
4306 return _g1->handle_evacuation_failure_par(cl, old, should_mark_root); |
| 342 | 4307 } |
| 4308 | |
| 526 | 4309 // We're going to allocate linearly, so might as well prefetch ahead. |
| 4310 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
| 4311 | |
| 342 | 4312 oop forward_ptr = old->forward_to_atomic(obj); |
| 4313 if (forward_ptr == NULL) { | |
| 4314 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
| 526 | 4315 if (g1p->track_object_age(alloc_purpose)) { |
| 4316 // We could simply do obj->incr_age(). However, this causes a | |
| 4317 // performance issue. obj->incr_age() will first check whether | |
| 4318 // the object has a displaced mark by checking its mark word; | |
| 4319 // getting the mark word from the new location of the object | |
| 4320 // stalls. So, given that we already have the mark word and we | |
| 4321 // are about to install it anyway, it's better to increase the | |
| 4322 // age on the mark word, when the object does not have a | |
| 4323 // displaced mark word. We're not expecting many objects to have | |
| 4324 // a displaced marked word, so that case is not optimized | |
| 4325 // further (it could be...) and we simply call obj->incr_age(). | |
| 4326 | |
| 4327 if (m->has_displaced_mark_helper()) { | |
| 4328 // in this case, we have to install the mark word first, | |
| 4329 // otherwise obj looks to be forwarded (the old mark word, | |
| 4330 // which contains the forward pointer, was copied) | |
| 4331 obj->set_mark(m); | |
| 4332 obj->incr_age(); | |
| 4333 } else { | |
| 4334 m = m->incr_age(); | |
| 545 | 4335 obj->set_mark(m); |
| 526 | 4336 } |
| 545 | 4337 _par_scan_state->age_table()->add(obj, word_sz); |
| 4338 } else { | |
| 4339 obj->set_mark(m); | |
| 526 | 4340 } |
| 4341 | |
|
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|
4342 // Mark the evacuated object or propagate "next" mark bit |
|
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|
4343 if (should_mark_copy) { |
| 342 | 4344 if (!use_local_bitmaps || |
| 4345 !_par_scan_state->alloc_buffer(alloc_purpose)->mark(obj_ptr)) { | |
| 4346 // if we couldn't mark it on the local bitmap (this happens when | |
| 4347 // the object was not allocated in the GCLab), we have to bite | |
| 4348 // the bullet and do the standard parallel mark | |
| 4349 _cm->markAndGrayObjectIfNecessary(obj); | |
| 4350 } | |
|
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|
4351 |
| 342 | 4352 if (_g1->isMarkedNext(old)) { |
|
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|
4353 // Unmark the object's old location so that marking |
|
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|
4354 // doesn't think the old object is alive. |
| 342 | 4355 _cm->nextMarkBitMap()->parClear((HeapWord*)old); |
| 4356 } | |
| 4357 } | |
| 4358 | |
| 4359 size_t* surv_young_words = _par_scan_state->surviving_young_words(); | |
| 4360 surv_young_words[young_index] += word_sz; | |
| 4361 | |
| 4362 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
| 4363 arrayOop(old)->set_length(0); | |
|
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|
4364 oop* old_p = set_partial_array_mask(old); |
|
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|
4365 _par_scan_state->push_on_queue(old_p); |
| 342 | 4366 } else { |
| 526 | 4367 // No point in using the slower heap_region_containing() method, |
| 4368 // given that we know obj is in the heap. | |
| 4369 _scanner->set_region(_g1->heap_region_containing_raw(obj)); | |
| 342 | 4370 obj->oop_iterate_backwards(_scanner); |
| 4371 } | |
| 4372 } else { | |
| 4373 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
| 4374 obj = forward_ptr; | |
| 4375 } | |
| 4376 return obj; | |
| 4377 } | |
| 4378 | |
|
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|
4379 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
|
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|
4380 template <class T> |
|
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|
4381 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> |
|
845
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|
4382 ::do_oop_work(T* p) { |
|
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|
4383 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 4384 assert(barrier != G1BarrierRS || obj != NULL, |
| 4385 "Precondition: G1BarrierRS implies obj is nonNull"); | |
| 4386 | |
|
3886
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|
4387 // Marking: |
|
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|
4388 // If the object is in the collection set, then the thread |
|
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|
4389 // that copies the object should mark, or propagate the |
|
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|
4390 // mark to, the evacuated object. |
|
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|
4391 // If the object is not in the collection set then we |
|
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|
4392 // should call the mark_object() method depending on the |
|
eeae91c9baba
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|
4393 // value of the template parameter do_mark_object (which will |
|
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|
4394 // be true for root scanning closures during an initial mark |
|
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|
4395 // pause). |
|
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changeset
|
4396 // The mark_object() method first checks whether the object |
|
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|
4397 // is marked and, if not, attempts to mark the object. |
|
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|
4398 |
| 526 | 4399 // here the null check is implicit in the cset_fast_test() test |
|
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
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diff
changeset
|
4400 if (_g1->in_cset_fast_test(obj)) { |
| 526 | 4401 if (obj->is_forwarded()) { |
|
845
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|
4402 oopDesc::encode_store_heap_oop(p, obj->forwardee()); |
|
3886
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|
4403 // If we are a root scanning closure during an initial |
|
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|
4404 // mark pause (i.e. do_mark_object will be true) then |
|
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|
4405 // we also need to handle marking of roots in the |
|
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|
4406 // event of an evacuation failure. In the event of an |
|
eeae91c9baba
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|
4407 // evacuation failure, the object is forwarded to itself |
|
3973
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|
4408 // and not copied. For root-scanning closures, the |
|
663cb89032b1
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|
4409 // object would be marked after a successful self-forward |
|
663cb89032b1
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|
4410 // but an object could be pointed to by both a root and non |
|
663cb89032b1
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|
4411 // root location and be self-forwarded by a non-root-scanning |
|
663cb89032b1
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|
4412 // closure. Therefore we also have to attempt to mark the |
|
663cb89032b1
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|
4413 // self-forwarded root object here. |
|
3886
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|
4414 if (do_mark_object && obj->forwardee() == obj) { |
|
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|
4415 mark_object(p); |
|
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|
4416 } |
| 526 | 4417 } else { |
|
3973
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|
4418 // During an initial mark pause, objects that are pointed to |
|
663cb89032b1
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|
4419 // by the roots need to be marked - even in the event of an |
|
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|
4420 // evacuation failure. We pass the template parameter |
|
663cb89032b1
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|
4421 // do_mark_object (which is true for root scanning closures |
|
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|
4422 // during an initial mark pause) to copy_to_survivor_space |
|
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|
4423 // which will pass it on to the evacuation failure handling |
|
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|
4424 // code. The thread that successfully self-forwards a root |
|
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|
4425 // object to itself is responsible for marking the object. |
|
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|
4426 bool should_mark_root = do_mark_object; |
|
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|
4427 |
|
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|
4428 // We need to mark the copied object if we're a root scanning |
|
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|
4429 // closure during an initial mark pause (i.e. do_mark_object |
|
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|
4430 // will be true), or the object is already marked and we need |
|
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|
4431 // to propagate the mark to the evacuated copy. |
|
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|
4432 bool should_mark_copy = do_mark_object || |
|
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|
4433 _during_initial_mark || |
|
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|
4434 (_mark_in_progress && !_g1->is_obj_ill(obj)); |
|
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|
4435 |
|
3973
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|
4436 oop copy_oop = copy_to_survivor_space(obj, should_mark_root, |
|
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|
4437 should_mark_copy); |
|
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|
4438 oopDesc::encode_store_heap_oop(p, copy_oop); |
| 342 | 4439 } |
| 526 | 4440 // When scanning the RS, we only care about objs in CS. |
| 4441 if (barrier == G1BarrierRS) { | |
|
616
4f360ec815ba
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changeset
|
4442 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 342 | 4443 } |
|
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|
4444 } else { |
|
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|
4445 // The object is not in collection set. If we're a root scanning |
|
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|
4446 // closure during an initial mark pause (i.e. do_mark_object will |
|
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|
4447 // be true) then attempt to mark the object. |
|
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|
4448 if (do_mark_object) { |
|
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|
4449 mark_object(p); |
|
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|
4450 } |
| 526 | 4451 } |
| 4452 | |
| 4453 if (barrier == G1BarrierEvac && obj != NULL) { | |
|
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|
4454 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 526 | 4455 } |
| 4456 | |
| 4457 if (do_gen_barrier && obj != NULL) { | |
| 4458 par_do_barrier(p); | |
| 4459 } | |
| 4460 } | |
| 4461 | |
|
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|
4462 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(oop* p); |
|
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|
4463 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(narrowOop* p); |
|
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4464 |
|
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|
4465 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
| 526 | 4466 assert(has_partial_array_mask(p), "invariant"); |
| 4467 oop old = clear_partial_array_mask(p); | |
| 342 | 4468 assert(old->is_objArray(), "must be obj array"); |
| 4469 assert(old->is_forwarded(), "must be forwarded"); | |
| 4470 assert(Universe::heap()->is_in_reserved(old), "must be in heap."); | |
| 4471 | |
| 4472 objArrayOop obj = objArrayOop(old->forwardee()); | |
| 4473 assert((void*)old != (void*)old->forwardee(), "self forwarding here?"); | |
| 4474 // Process ParGCArrayScanChunk elements now | |
| 4475 // and push the remainder back onto queue | |
| 4476 int start = arrayOop(old)->length(); | |
| 4477 int end = obj->length(); | |
| 4478 int remainder = end - start; | |
| 4479 assert(start <= end, "just checking"); | |
| 4480 if (remainder > 2 * ParGCArrayScanChunk) { | |
| 4481 // Test above combines last partial chunk with a full chunk | |
| 4482 end = start + ParGCArrayScanChunk; | |
| 4483 arrayOop(old)->set_length(end); | |
| 4484 // Push remainder. | |
|
845
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|
4485 oop* old_p = set_partial_array_mask(old); |
|
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|
4486 assert(arrayOop(old)->length() < obj->length(), "Empty push?"); |
|
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|
4487 _par_scan_state->push_on_queue(old_p); |
| 342 | 4488 } else { |
| 4489 // Restore length so that the heap remains parsable in | |
| 4490 // case of evacuation failure. | |
| 4491 arrayOop(old)->set_length(end); | |
| 4492 } | |
|
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|
4493 _scanner.set_region(_g1->heap_region_containing_raw(obj)); |
| 342 | 4494 // process our set of indices (include header in first chunk) |
|
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|
4495 obj->oop_iterate_range(&_scanner, start, end); |
| 342 | 4496 } |
| 4497 | |
| 4498 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
| 4499 protected: | |
| 4500 G1CollectedHeap* _g1h; | |
| 4501 G1ParScanThreadState* _par_scan_state; | |
| 4502 RefToScanQueueSet* _queues; | |
| 4503 ParallelTaskTerminator* _terminator; | |
| 4504 | |
| 4505 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
| 4506 RefToScanQueueSet* queues() { return _queues; } | |
| 4507 ParallelTaskTerminator* terminator() { return _terminator; } | |
| 4508 | |
| 4509 public: | |
| 4510 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
| 4511 G1ParScanThreadState* par_scan_state, | |
| 4512 RefToScanQueueSet* queues, | |
| 4513 ParallelTaskTerminator* terminator) | |
| 4514 : _g1h(g1h), _par_scan_state(par_scan_state), | |
| 4515 _queues(queues), _terminator(terminator) {} | |
| 4516 | |
|
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|
4517 void do_void(); |
|
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4518 |
|
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|
4519 private: |
|
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|
4520 inline bool offer_termination(); |
|
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|
4521 }; |
|
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|
4522 |
|
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|
4523 bool G1ParEvacuateFollowersClosure::offer_termination() { |
|
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|
4524 G1ParScanThreadState* const pss = par_scan_state(); |
|
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|
4525 pss->start_term_time(); |
|
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|
4526 const bool res = terminator()->offer_termination(); |
|
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|
4527 pss->end_term_time(); |
|
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|
4528 return res; |
|
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|
4529 } |
|
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|
4530 |
|
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|
4531 void G1ParEvacuateFollowersClosure::do_void() { |
|
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|
4532 StarTask stolen_task; |
|
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|
4533 G1ParScanThreadState* const pss = par_scan_state(); |
|
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|
4534 pss->trim_queue(); |
|
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|
4535 |
|
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|
4536 do { |
|
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|
4537 while (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
|
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|
4538 assert(pss->verify_task(stolen_task), "sanity"); |
|
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|
4539 if (stolen_task.is_narrow()) { |
|
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|
4540 pss->deal_with_reference((narrowOop*) stolen_task); |
|
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|
4541 } else { |
|
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|
4542 pss->deal_with_reference((oop*) stolen_task); |
|
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|
4543 } |
|
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|
4544 |
|
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|
4545 // We've just processed a reference and we might have made |
|
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|
4546 // available new entries on the queues. So we have to make sure |
|
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|
4547 // we drain the queues as necessary. |
| 342 | 4548 pss->trim_queue(); |
| 4549 } | |
|
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|
4550 } while (!offer_termination()); |
|
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|
4551 |
|
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|
4552 pss->retire_alloc_buffers(); |
|
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|
4553 } |
| 342 | 4554 |
| 4555 class G1ParTask : public AbstractGangTask { | |
| 4556 protected: | |
| 4557 G1CollectedHeap* _g1h; | |
| 4558 RefToScanQueueSet *_queues; | |
| 4559 ParallelTaskTerminator _terminator; | |
|
845
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|
4560 int _n_workers; |
| 342 | 4561 |
| 4562 Mutex _stats_lock; | |
| 4563 Mutex* stats_lock() { return &_stats_lock; } | |
| 4564 | |
| 4565 size_t getNCards() { | |
| 4566 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
| 4567 / G1BlockOffsetSharedArray::N_bytes; | |
| 4568 } | |
| 4569 | |
| 4570 public: | |
| 4571 G1ParTask(G1CollectedHeap* g1h, int workers, RefToScanQueueSet *task_queues) | |
| 4572 : AbstractGangTask("G1 collection"), | |
| 4573 _g1h(g1h), | |
| 4574 _queues(task_queues), | |
| 4575 _terminator(workers, _queues), | |
|
845
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|
4576 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true), |
|
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|
4577 _n_workers(workers) |
| 342 | 4578 {} |
| 4579 | |
| 4580 RefToScanQueueSet* queues() { return _queues; } | |
| 4581 | |
| 4582 RefToScanQueue *work_queue(int i) { | |
| 4583 return queues()->queue(i); | |
| 4584 } | |
| 4585 | |
| 4586 void work(int i) { | |
|
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|
4587 if (i >= _n_workers) return; // no work needed this round |
| 1611 | 4588 |
| 4589 double start_time_ms = os::elapsedTime() * 1000.0; | |
| 4590 _g1h->g1_policy()->record_gc_worker_start_time(i, start_time_ms); | |
| 4591 | |
| 342 | 4592 ResourceMark rm; |
| 4593 HandleMark hm; | |
| 4594 | |
|
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|
4595 ReferenceProcessor* rp = _g1h->ref_processor_stw(); |
|
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|
4596 |
| 526 | 4597 G1ParScanThreadState pss(_g1h, i); |
|
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|
4598 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, rp); |
|
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|
4599 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, rp); |
|
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|
4600 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, rp); |
| 342 | 4601 |
| 4602 pss.set_evac_closure(&scan_evac_cl); | |
| 4603 pss.set_evac_failure_closure(&evac_failure_cl); | |
| 4604 pss.set_partial_scan_closure(&partial_scan_cl); | |
| 4605 | |
|
3979
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|
4606 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss, rp); |
|
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|
4607 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss, rp); |
|
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|
4608 |
|
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|
4609 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss, rp); |
|
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|
4610 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss, rp); |
|
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|
4611 |
|
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|
4612 OopClosure* scan_root_cl = &only_scan_root_cl; |
|
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|
4613 OopsInHeapRegionClosure* scan_perm_cl = &only_scan_perm_cl; |
| 342 | 4614 |
|
1359
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
4615 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
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|
4616 // We also need to mark copied objects. |
| 342 | 4617 scan_root_cl = &scan_mark_root_cl; |
| 4618 scan_perm_cl = &scan_mark_perm_cl; | |
| 4619 } | |
| 4620 | |
|
3983
811ec3d0833b
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|
4621 G1ParPushHeapRSClosure push_heap_rs_cl(_g1h, &pss); |
|
3979
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|
4622 |
| 342 | 4623 pss.start_strong_roots(); |
| 4624 _g1h->g1_process_strong_roots(/* not collecting perm */ false, | |
| 4625 SharedHeap::SO_AllClasses, | |
| 4626 scan_root_cl, | |
|
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|
4627 &push_heap_rs_cl, |
| 342 | 4628 scan_perm_cl, |
| 4629 i); | |
| 4630 pss.end_strong_roots(); | |
|
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|
4631 |
| 342 | 4632 { |
| 4633 double start = os::elapsedTime(); | |
| 4634 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); | |
| 4635 evac.do_void(); | |
| 4636 double elapsed_ms = (os::elapsedTime()-start)*1000.0; | |
| 4637 double term_ms = pss.term_time()*1000.0; | |
| 4638 _g1h->g1_policy()->record_obj_copy_time(i, elapsed_ms-term_ms); | |
| 1611 | 4639 _g1h->g1_policy()->record_termination(i, term_ms, pss.term_attempts()); |
| 342 | 4640 } |
| 1282 | 4641 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
| 342 | 4642 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
| 4643 | |
| 4644 // Clean up any par-expanded rem sets. | |
| 4645 HeapRegionRemSet::par_cleanup(); | |
| 4646 | |
| 4647 if (ParallelGCVerbose) { | |
| 1709 | 4648 MutexLocker x(stats_lock()); |
| 4649 pss.print_termination_stats(i); | |
| 342 | 4650 } |
| 4651 | |
|
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|
4652 assert(pss.refs()->is_empty(), "should be empty"); |
| 1611 | 4653 double end_time_ms = os::elapsedTime() * 1000.0; |
| 4654 _g1h->g1_policy()->record_gc_worker_end_time(i, end_time_ms); | |
| 342 | 4655 } |
| 4656 }; | |
| 4657 | |
| 4658 // *** Common G1 Evacuation Stuff | |
| 4659 | |
|
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|
4660 // This method is run in a GC worker. |
|
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|
4661 |
| 342 | 4662 void |
| 4663 G1CollectedHeap:: | |
| 4664 g1_process_strong_roots(bool collecting_perm_gen, | |
| 4665 SharedHeap::ScanningOption so, | |
| 4666 OopClosure* scan_non_heap_roots, | |
| 4667 OopsInHeapRegionClosure* scan_rs, | |
| 4668 OopsInGenClosure* scan_perm, | |
| 4669 int worker_i) { | |
|
3979
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|
4670 |
| 342 | 4671 // First scan the strong roots, including the perm gen. |
| 4672 double ext_roots_start = os::elapsedTime(); | |
| 4673 double closure_app_time_sec = 0.0; | |
| 4674 | |
| 4675 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
| 4676 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
| 4677 buf_scan_perm.set_generation(perm_gen()); | |
| 4678 | |
|
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|
4679 // Walk the code cache w/o buffering, because StarTask cannot handle |
|
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|
4680 // unaligned oop locations. |
|
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|
4681 CodeBlobToOopClosure eager_scan_code_roots(scan_non_heap_roots, /*do_marking=*/ true); |
|
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|
4682 |
|
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|
4683 process_strong_roots(false, // no scoping; this is parallel code |
|
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|
4684 collecting_perm_gen, so, |
| 342 | 4685 &buf_scan_non_heap_roots, |
|
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|
4686 &eager_scan_code_roots, |
| 342 | 4687 &buf_scan_perm); |
|
1394
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|
4688 |
|
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|
4689 // Now the CM ref_processor roots. |
|
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|
4690 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { |
|
3979
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|
4691 // We need to treat the discovered reference lists of the |
|
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|
4692 // concurrent mark ref processor as roots and keep entries |
|
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|
4693 // (which are added by the marking threads) on them live |
|
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|
4694 // until they can be processed at the end of marking. |
|
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|
4695 ref_processor_cm()->weak_oops_do(&buf_scan_non_heap_roots); |
|
3823
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|
4696 } |
|
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|
4697 |
|
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|
4698 // Finish up any enqueued closure apps (attributed as object copy time). |
| 342 | 4699 buf_scan_non_heap_roots.done(); |
| 4700 buf_scan_perm.done(); | |
|
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4701 |
| 342 | 4702 double ext_roots_end = os::elapsedTime(); |
|
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|
4703 |
| 342 | 4704 g1_policy()->reset_obj_copy_time(worker_i); |
|
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|
4705 double obj_copy_time_sec = buf_scan_perm.closure_app_seconds() + |
|
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|
4706 buf_scan_non_heap_roots.closure_app_seconds(); |
| 342 | 4707 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); |
|
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|
4708 |
| 342 | 4709 double ext_root_time_ms = |
| 4710 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
|
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|
4711 |
| 342 | 4712 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); |
| 4713 | |
| 4714 // Scan strong roots in mark stack. | |
| 4715 if (!_process_strong_tasks->is_task_claimed(G1H_PS_mark_stack_oops_do)) { | |
| 4716 concurrent_mark()->oops_do(scan_non_heap_roots); | |
| 4717 } | |
| 4718 double mark_stack_scan_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; | |
| 4719 g1_policy()->record_mark_stack_scan_time(worker_i, mark_stack_scan_ms); | |
| 4720 | |
| 4721 // Now scan the complement of the collection set. | |
| 4722 if (scan_rs != NULL) { | |
| 4723 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
| 4724 } | |
|
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|
4725 |
| 342 | 4726 _process_strong_tasks->all_tasks_completed(); |
| 4727 } | |
| 4728 | |
| 4729 void | |
| 4730 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
| 4731 OopClosure* non_root_closure) { | |
|
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|
4732 CodeBlobToOopClosure roots_in_blobs(root_closure, /*do_marking=*/ false); |
|
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|
4733 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs, non_root_closure); |
| 342 | 4734 } |
| 4735 | |
|
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|
4736 // Weak Reference Processing support |
|
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|
4737 |
|
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|
4738 // An always "is_alive" closure that is used to preserve referents. |
|
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|
4739 // If the object is non-null then it's alive. Used in the preservation |
|
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|
4740 // of referent objects that are pointed to by reference objects |
|
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|
4741 // discovered by the CM ref processor. |
|
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|
4742 class G1AlwaysAliveClosure: public BoolObjectClosure { |
|
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|
4743 G1CollectedHeap* _g1; |
|
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|
4744 public: |
|
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|
4745 G1AlwaysAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
|
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|
4746 void do_object(oop p) { assert(false, "Do not call."); } |
|
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|
4747 bool do_object_b(oop p) { |
|
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|
4748 if (p != NULL) { |
|
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|
4749 return true; |
|
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|
4750 } |
|
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|
4751 return false; |
|
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|
4752 } |
|
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|
4753 }; |
|
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|
4754 |
|
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changeset
|
4755 bool G1STWIsAliveClosure::do_object_b(oop p) { |
|
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|
4756 // An object is reachable if it is outside the collection set, |
|
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|
4757 // or is inside and copied. |
|
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changeset
|
4758 return !_g1->obj_in_cs(p) || p->is_forwarded(); |
|
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|
4759 } |
|
4dfb2df418f2
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changeset
|
4760 |
|
4dfb2df418f2
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diff
changeset
|
4761 // Non Copying Keep Alive closure |
|
4dfb2df418f2
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changeset
|
4762 class G1KeepAliveClosure: public OopClosure { |
|
4dfb2df418f2
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changeset
|
4763 G1CollectedHeap* _g1; |
|
4dfb2df418f2
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changeset
|
4764 public: |
|
4dfb2df418f2
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changeset
|
4765 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} |
|
4dfb2df418f2
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changeset
|
4766 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
|
4dfb2df418f2
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changeset
|
4767 void do_oop( oop* p) { |
|
4dfb2df418f2
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parents:
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changeset
|
4768 oop obj = *p; |
|
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changeset
|
4769 |
|
4dfb2df418f2
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diff
changeset
|
4770 if (_g1->obj_in_cs(obj)) { |
|
4dfb2df418f2
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changeset
|
4771 assert( obj->is_forwarded(), "invariant" ); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
4772 *p = obj->forwardee(); |
|
4dfb2df418f2
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changeset
|
4773 } |
|
4dfb2df418f2
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changeset
|
4774 } |
|
4dfb2df418f2
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changeset
|
4775 }; |
|
4dfb2df418f2
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changeset
|
4776 |
|
4dfb2df418f2
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changeset
|
4777 // Copying Keep Alive closure - can be called from both |
|
4dfb2df418f2
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diff
changeset
|
4778 // serial and parallel code as long as different worker |
|
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changeset
|
4779 // threads utilize different G1ParScanThreadState instances |
|
4dfb2df418f2
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changeset
|
4780 // and different queues. |
|
4dfb2df418f2
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changeset
|
4781 |
|
4dfb2df418f2
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changeset
|
4782 class G1CopyingKeepAliveClosure: public OopClosure { |
|
4dfb2df418f2
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changeset
|
4783 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
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|
4784 OopClosure* _copy_non_heap_obj_cl; |
|
4dfb2df418f2
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|
4785 OopsInHeapRegionClosure* _copy_perm_obj_cl; |
|
4dfb2df418f2
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changeset
|
4786 G1ParScanThreadState* _par_scan_state; |
|
4dfb2df418f2
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changeset
|
4787 |
|
4dfb2df418f2
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changeset
|
4788 public: |
|
4dfb2df418f2
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diff
changeset
|
4789 G1CopyingKeepAliveClosure(G1CollectedHeap* g1h, |
|
4dfb2df418f2
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changeset
|
4790 OopClosure* non_heap_obj_cl, |
|
4dfb2df418f2
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changeset
|
4791 OopsInHeapRegionClosure* perm_obj_cl, |
|
4dfb2df418f2
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changeset
|
4792 G1ParScanThreadState* pss): |
|
4dfb2df418f2
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changeset
|
4793 _g1h(g1h), |
|
4dfb2df418f2
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changeset
|
4794 _copy_non_heap_obj_cl(non_heap_obj_cl), |
|
4dfb2df418f2
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changeset
|
4795 _copy_perm_obj_cl(perm_obj_cl), |
|
4dfb2df418f2
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changeset
|
4796 _par_scan_state(pss) |
|
4dfb2df418f2
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changeset
|
4797 {} |
|
4dfb2df418f2
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changeset
|
4798 |
|
4dfb2df418f2
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|
4799 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
4dfb2df418f2
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|
4800 virtual void do_oop( oop* p) { do_oop_work(p); } |
|
4dfb2df418f2
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|
4801 |
|
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changeset
|
4802 template <class T> void do_oop_work(T* p) { |
|
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|
4803 oop obj = oopDesc::load_decode_heap_oop(p); |
|
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|
4804 |
|
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changeset
|
4805 if (_g1h->obj_in_cs(obj)) { |
|
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|
4806 // If the referent object has been forwarded (either copied |
|
4dfb2df418f2
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changeset
|
4807 // to a new location or to itself in the event of an |
|
4dfb2df418f2
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|
4808 // evacuation failure) then we need to update the reference |
|
4dfb2df418f2
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|
4809 // field and, if both reference and referent are in the G1 |
|
4dfb2df418f2
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changeset
|
4810 // heap, update the RSet for the referent. |
|
4dfb2df418f2
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changeset
|
4811 // |
|
4dfb2df418f2
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diff
changeset
|
4812 // If the referent has not been forwarded then we have to keep |
|
4dfb2df418f2
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|
4813 // it alive by policy. Therefore we have copy the referent. |
|
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|
4814 // |
|
4dfb2df418f2
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changeset
|
4815 // If the reference field is in the G1 heap then we can push |
|
4dfb2df418f2
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changeset
|
4816 // on the PSS queue. When the queue is drained (after each |
|
4dfb2df418f2
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changeset
|
4817 // phase of reference processing) the object and it's followers |
|
4dfb2df418f2
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changeset
|
4818 // will be copied, the reference field set to point to the |
|
4dfb2df418f2
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changeset
|
4819 // new location, and the RSet updated. Otherwise we need to |
|
4dfb2df418f2
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diff
changeset
|
4820 // use the the non-heap or perm closures directly to copy |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4821 // the refernt object and update the pointer, while avoiding |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4822 // updating the RSet. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4823 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4824 if (_g1h->is_in_g1_reserved(p)) { |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4825 _par_scan_state->push_on_queue(p); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4826 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4827 // The reference field is not in the G1 heap. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4828 if (_g1h->perm_gen()->is_in(p)) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4829 _copy_perm_obj_cl->do_oop(p); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4830 } else { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4831 _copy_non_heap_obj_cl->do_oop(p); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4832 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4833 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4834 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4835 } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4836 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4837 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4838 // Serial drain queue closure. Called as the 'complete_gc' |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4839 // closure for each discovered list in some of the |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4840 // reference processing phases. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4841 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4842 class G1STWDrainQueueClosure: public VoidClosure { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
4843 protected: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4844 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
4845 G1ParScanThreadState* _par_scan_state; |
|
4dfb2df418f2
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parents:
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diff
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|
4846 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4847 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } |
|
4dfb2df418f2
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parents:
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changeset
|
4848 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4849 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4850 G1STWDrainQueueClosure(G1CollectedHeap* g1h, G1ParScanThreadState* pss) : |
|
4dfb2df418f2
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parents:
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diff
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|
4851 _g1h(g1h), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4852 _par_scan_state(pss) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
4853 { } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4854 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4855 void do_void() { |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4856 G1ParScanThreadState* const pss = par_scan_state(); |
|
4dfb2df418f2
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parents:
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diff
changeset
|
4857 pss->trim_queue(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4858 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4859 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4860 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4861 // Parallel Reference Processing closures |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4862 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4863 // Implementation of AbstractRefProcTaskExecutor for parallel reference |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4864 // processing during G1 evacuation pauses. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4865 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4866 class G1STWRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4867 private: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4868 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4869 RefToScanQueueSet* _queues; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4870 WorkGang* _workers; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4871 int _active_workers; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4872 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4873 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4874 G1STWRefProcTaskExecutor(G1CollectedHeap* g1h, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4875 WorkGang* workers, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4876 RefToScanQueueSet *task_queues, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4877 int n_workers) : |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4878 _g1h(g1h), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4879 _queues(task_queues), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4880 _workers(workers), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4881 _active_workers(n_workers) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4882 { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4883 assert(n_workers > 0, "shouldn't call this otherwise"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4884 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4885 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4886 // Executes the given task using concurrent marking worker threads. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4887 virtual void execute(ProcessTask& task); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4888 virtual void execute(EnqueueTask& task); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4889 }; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4890 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4891 // Gang task for possibly parallel reference processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4892 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4893 class G1STWRefProcTaskProxy: public AbstractGangTask { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4894 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4895 ProcessTask& _proc_task; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4896 G1CollectedHeap* _g1h; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4897 RefToScanQueueSet *_task_queues; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4898 ParallelTaskTerminator* _terminator; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4899 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4900 public: |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4901 G1STWRefProcTaskProxy(ProcessTask& proc_task, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4902 G1CollectedHeap* g1h, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4903 RefToScanQueueSet *task_queues, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4904 ParallelTaskTerminator* terminator) : |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4905 AbstractGangTask("Process reference objects in parallel"), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4906 _proc_task(proc_task), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4907 _g1h(g1h), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4908 _task_queues(task_queues), |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4909 _terminator(terminator) |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4910 {} |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4911 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4912 virtual void work(int i) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4913 // The reference processing task executed by a single worker. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4914 ResourceMark rm; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4915 HandleMark hm; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4916 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4917 G1STWIsAliveClosure is_alive(_g1h); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4918 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4919 G1ParScanThreadState pss(_g1h, i); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4920 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4921 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
4922 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4923 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4924 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
4925 pss.set_evac_closure(&scan_evac_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4926 pss.set_evac_failure_closure(&evac_failure_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4927 pss.set_partial_scan_closure(&partial_scan_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4928 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4929 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4930 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4931 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4932 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
|
4933 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
|
4934 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4935 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4936 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4937 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
4938 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4939 // We also need to mark copied objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4940 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4941 copy_perm_cl = ©_mark_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4942 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4943 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4944 // Keep alive closure. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4945 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:
3973
diff
changeset
|
4946 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
4947 // Complete GC closure |
|
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|
4948 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _task_queues, _terminator); |
|
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|
4949 |
|
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|
4950 // Call the reference processing task's work routine. |
|
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|
4951 _proc_task.work(i, is_alive, keep_alive, drain_queue); |
|
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|
4952 |
|
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|
4953 // Note we cannot assert that the refs array is empty here as not all |
|
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4954 // of the processing tasks (specifically phase2 - pp2_work) execute |
|
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|
4955 // the complete_gc closure (which ordinarily would drain the queue) so |
|
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|
4956 // the queue may not be empty. |
|
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|
4957 } |
|
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|
4958 }; |
|
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|
4959 |
|
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|
4960 // Driver routine for parallel reference processing. |
|
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|
4961 // Creates an instance of the ref processing gang |
|
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|
4962 // task and has the worker threads execute it. |
|
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|
4963 void G1STWRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
|
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|
4964 assert(_workers != NULL, "Need parallel worker threads."); |
|
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|
4965 |
|
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|
4966 ParallelTaskTerminator terminator(_active_workers, _queues); |
|
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|
4967 G1STWRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _queues, &terminator); |
|
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|
4968 |
|
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|
4969 _g1h->set_par_threads(_active_workers); |
|
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|
4970 _workers->run_task(&proc_task_proxy); |
|
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|
4971 _g1h->set_par_threads(0); |
|
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|
4972 } |
|
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|
4973 |
|
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|
4974 // Gang task for parallel reference enqueueing. |
|
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|
4975 |
|
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|
4976 class G1STWRefEnqueueTaskProxy: public AbstractGangTask { |
|
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4977 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
|
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|
4978 EnqueueTask& _enq_task; |
|
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|
4979 |
|
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|
4980 public: |
|
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|
4981 G1STWRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
|
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|
4982 AbstractGangTask("Enqueue reference objects in parallel"), |
|
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|
4983 _enq_task(enq_task) |
|
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|
4984 { } |
|
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|
4985 |
|
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|
4986 virtual void work(int i) { |
|
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|
4987 _enq_task.work(i); |
|
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|
4988 } |
|
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|
4989 }; |
|
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|
4990 |
|
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|
4991 // Driver routine for parallel reference enqueing. |
|
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|
4992 // Creates an instance of the ref enqueueing gang |
|
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|
4993 // task and has the worker threads execute it. |
|
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|
4994 |
|
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|
4995 void G1STWRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
|
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|
4996 assert(_workers != NULL, "Need parallel worker threads."); |
|
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|
4997 |
|
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|
4998 G1STWRefEnqueueTaskProxy enq_task_proxy(enq_task); |
|
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|
4999 |
|
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|
5000 _g1h->set_par_threads(_active_workers); |
|
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|
5001 _workers->run_task(&enq_task_proxy); |
|
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|
5002 _g1h->set_par_threads(0); |
|
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|
5003 } |
|
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|
5004 |
|
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|
5005 // End of weak reference support closures |
|
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|
5006 |
|
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|
5007 // Abstract task used to preserve (i.e. copy) any referent objects |
|
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|
5008 // that are in the collection set and are pointed to by reference |
|
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|
5009 // objects discovered by the CM ref processor. |
|
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changeset
|
5010 |
|
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|
5011 class G1ParPreserveCMReferentsTask: public AbstractGangTask { |
|
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|
5012 protected: |
|
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|
5013 G1CollectedHeap* _g1h; |
|
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changeset
|
5014 RefToScanQueueSet *_queues; |
|
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changeset
|
5015 ParallelTaskTerminator _terminator; |
|
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diff
changeset
|
5016 int _n_workers; |
|
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diff
changeset
|
5017 |
|
4dfb2df418f2
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diff
changeset
|
5018 public: |
|
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diff
changeset
|
5019 G1ParPreserveCMReferentsTask(G1CollectedHeap* g1h,int workers, RefToScanQueueSet *task_queues) : |
|
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changeset
|
5020 AbstractGangTask("ParPreserveCMReferents"), |
|
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changeset
|
5021 _g1h(g1h), |
|
4dfb2df418f2
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diff
changeset
|
5022 _queues(task_queues), |
|
4dfb2df418f2
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changeset
|
5023 _terminator(workers, _queues), |
|
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changeset
|
5024 _n_workers(workers) |
|
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diff
changeset
|
5025 { } |
|
4dfb2df418f2
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diff
changeset
|
5026 |
|
4dfb2df418f2
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diff
changeset
|
5027 void work(int i) { |
|
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diff
changeset
|
5028 ResourceMark rm; |
|
4dfb2df418f2
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diff
changeset
|
5029 HandleMark hm; |
|
4dfb2df418f2
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diff
changeset
|
5030 |
|
4dfb2df418f2
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diff
changeset
|
5031 G1ParScanThreadState pss(_g1h, i); |
|
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|
5032 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss, NULL); |
|
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|
5033 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss, NULL); |
|
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|
5034 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss, NULL); |
|
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changeset
|
5035 |
|
4dfb2df418f2
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diff
changeset
|
5036 pss.set_evac_closure(&scan_evac_cl); |
|
4dfb2df418f2
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changeset
|
5037 pss.set_evac_failure_closure(&evac_failure_cl); |
|
4dfb2df418f2
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changeset
|
5038 pss.set_partial_scan_closure(&partial_scan_cl); |
|
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changeset
|
5039 |
|
4dfb2df418f2
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changeset
|
5040 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
|
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changeset
|
5041 |
|
4dfb2df418f2
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changeset
|
5042 |
|
4dfb2df418f2
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diff
changeset
|
5043 G1ParScanExtRootClosure only_copy_non_heap_cl(_g1h, &pss, NULL); |
|
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|
5044 G1ParScanPermClosure only_copy_perm_cl(_g1h, &pss, NULL); |
|
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|
5045 |
|
4dfb2df418f2
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diff
changeset
|
5046 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(_g1h, &pss, NULL); |
|
4dfb2df418f2
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changeset
|
5047 G1ParScanAndMarkPermClosure copy_mark_perm_cl(_g1h, &pss, NULL); |
|
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|
5048 |
|
4dfb2df418f2
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diff
changeset
|
5049 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
|
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|
5050 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
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|
5051 |
|
4dfb2df418f2
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diff
changeset
|
5052 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
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diff
changeset
|
5053 // We also need to mark copied objects. |
|
4dfb2df418f2
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diff
changeset
|
5054 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
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changeset
|
5055 copy_perm_cl = ©_mark_perm_cl; |
|
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changeset
|
5056 } |
|
4dfb2df418f2
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diff
changeset
|
5057 |
|
4dfb2df418f2
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diff
changeset
|
5058 // Is alive closure |
|
4dfb2df418f2
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diff
changeset
|
5059 G1AlwaysAliveClosure always_alive(_g1h); |
|
4dfb2df418f2
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diff
changeset
|
5060 |
|
4dfb2df418f2
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diff
changeset
|
5061 // Copying keep alive closure. Applied to referent objects that need |
|
4dfb2df418f2
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diff
changeset
|
5062 // to be copied. |
|
4dfb2df418f2
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diff
changeset
|
5063 G1CopyingKeepAliveClosure keep_alive(_g1h, copy_non_heap_cl, copy_perm_cl, &pss); |
|
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changeset
|
5064 |
|
4dfb2df418f2
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diff
changeset
|
5065 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
|
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changeset
|
5066 |
|
4dfb2df418f2
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diff
changeset
|
5067 int limit = ReferenceProcessor::number_of_subclasses_of_ref() * rp->max_num_q(); |
|
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|
5068 int stride = MIN2(MAX2(_n_workers, 1), limit); |
|
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diff
changeset
|
5069 |
|
4dfb2df418f2
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diff
changeset
|
5070 // limit is set using max_num_q() - which was set using ParallelGCThreads. |
|
4dfb2df418f2
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diff
changeset
|
5071 // So this must be true - but assert just in case someone decides to |
|
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changeset
|
5072 // change the worker ids. |
|
4dfb2df418f2
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diff
changeset
|
5073 assert(0 <= i && i < limit, "sanity"); |
|
4dfb2df418f2
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changeset
|
5074 assert(!rp->discovery_is_atomic(), "check this code"); |
|
4dfb2df418f2
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diff
changeset
|
5075 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5076 // Select discovered lists [i, i+stride, i+2*stride,...,limit) |
|
4dfb2df418f2
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diff
changeset
|
5077 for (int idx = i; idx < limit; idx += stride) { |
|
4dfb2df418f2
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changeset
|
5078 DiscoveredList& ref_list = rp->discovered_soft_refs()[idx]; |
|
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changeset
|
5079 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5080 DiscoveredListIterator iter(ref_list, &keep_alive, &always_alive); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5081 while (iter.has_next()) { |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5082 // Since discovery is not atomic for the CM ref processor, we |
|
4dfb2df418f2
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diff
changeset
|
5083 // can see some null referent objects. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5084 iter.load_ptrs(DEBUG_ONLY(true)); |
|
4dfb2df418f2
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diff
changeset
|
5085 oop ref = iter.obj(); |
|
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6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5086 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5087 // This will filter nulls. |
|
4dfb2df418f2
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diff
changeset
|
5088 if (iter.is_referent_alive()) { |
|
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diff
changeset
|
5089 iter.make_referent_alive(); |
|
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parents:
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diff
changeset
|
5090 } |
|
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parents:
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diff
changeset
|
5091 iter.move_to_next(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5092 } |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5093 } |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5094 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5095 // Drain the queue - which may cause stealing |
|
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parents:
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changeset
|
5096 G1ParEvacuateFollowersClosure drain_queue(_g1h, &pss, _queues, &_terminator); |
|
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changeset
|
5097 drain_queue.do_void(); |
|
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diff
changeset
|
5098 // Allocation buffers were retired at the end of G1ParEvacuateFollowersClosure |
|
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changeset
|
5099 assert(pss.refs()->is_empty(), "should be"); |
|
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|
5100 } |
|
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parents:
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diff
changeset
|
5101 }; |
|
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parents:
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diff
changeset
|
5102 |
|
4dfb2df418f2
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diff
changeset
|
5103 // Weak Reference processing during an evacuation pause (part 1). |
|
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diff
changeset
|
5104 void G1CollectedHeap::process_discovered_references() { |
|
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changeset
|
5105 double ref_proc_start = os::elapsedTime(); |
|
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diff
changeset
|
5106 |
|
4dfb2df418f2
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diff
changeset
|
5107 ReferenceProcessor* rp = _ref_processor_stw; |
|
4dfb2df418f2
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changeset
|
5108 assert(rp->discovery_enabled(), "should have been enabled"); |
|
4dfb2df418f2
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diff
changeset
|
5109 |
|
4dfb2df418f2
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diff
changeset
|
5110 // Any reference objects, in the collection set, that were 'discovered' |
|
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diff
changeset
|
5111 // by the CM ref processor should have already been copied (either by |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5112 // applying the external root copy closure to the discovered lists, or |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5113 // by following an RSet entry). |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5114 // |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5115 // But some of the referents, that are in the collection set, that these |
|
4dfb2df418f2
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diff
changeset
|
5116 // reference objects point to may not have been copied: the STW ref |
|
4dfb2df418f2
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diff
changeset
|
5117 // processor would have seen that the reference object had already |
|
4dfb2df418f2
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diff
changeset
|
5118 // been 'discovered' and would have skipped discovering the reference, |
|
4dfb2df418f2
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diff
changeset
|
5119 // but would not have treated the reference object as a regular oop. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5120 // As a reult the copy closure would not have been applied to the |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5121 // referent object. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5122 // |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5123 // We need to explicitly copy these referent objects - the references |
|
4dfb2df418f2
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diff
changeset
|
5124 // will be processed at the end of remarking. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5125 // |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5126 // We also need to do this copying before we process the reference |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5127 // objects discovered by the STW ref processor in case one of these |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5128 // referents points to another object which is also referenced by an |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5129 // object discovered by the STW ref processor. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5130 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5131 int n_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5132 workers()->total_workers() : 1); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5133 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5134 set_par_threads(n_workers); |
|
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5135 G1ParPreserveCMReferentsTask keep_cm_referents(this, n_workers, _task_queues); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
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diff
changeset
|
5136 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5137 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5138 workers()->run_task(&keep_cm_referents); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5139 } else { |
|
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5140 keep_cm_referents.work(0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5141 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5142 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5143 set_par_threads(0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5144 |
|
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5145 // Closure to test whether a referent is alive. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5146 G1STWIsAliveClosure is_alive(this); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5147 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5148 // Even when parallel reference processing is enabled, the processing |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5149 // of JNI refs is serial and performed serially by the current thread |
|
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5150 // 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
|
5151 // JNI refs. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5152 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5153 // Use only a single queue for this PSS. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5154 G1ParScanThreadState pss(this, 0); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5155 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5156 // We do not embed a reference processor in the copying/scanning |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5157 // closures while we're actually processing the discovered |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5158 // reference objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5159 G1ParScanHeapEvacClosure scan_evac_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5160 G1ParScanHeapEvacFailureClosure evac_failure_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5161 G1ParScanPartialArrayClosure partial_scan_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5162 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5163 pss.set_evac_closure(&scan_evac_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5164 pss.set_evac_failure_closure(&evac_failure_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5165 pss.set_partial_scan_closure(&partial_scan_cl); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5166 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5167 assert(pss.refs()->is_empty(), "pre-condition"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5168 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5169 G1ParScanExtRootClosure only_copy_non_heap_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5170 G1ParScanPermClosure only_copy_perm_cl(this, &pss, NULL); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5171 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5172 G1ParScanAndMarkExtRootClosure copy_mark_non_heap_cl(this, &pss, NULL); |
|
4dfb2df418f2
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diff
changeset
|
5173 G1ParScanAndMarkPermClosure copy_mark_perm_cl(this, &pss, NULL); |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5174 |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5175 OopClosure* copy_non_heap_cl = &only_copy_non_heap_cl; |
|
4dfb2df418f2
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diff
changeset
|
5176 OopsInHeapRegionClosure* copy_perm_cl = &only_copy_perm_cl; |
|
4dfb2df418f2
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3973
diff
changeset
|
5177 |
|
4dfb2df418f2
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diff
changeset
|
5178 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5179 // We also need to mark copied objects. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5180 copy_non_heap_cl = ©_mark_non_heap_cl; |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5181 copy_perm_cl = ©_mark_perm_cl; |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5182 } |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5183 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5184 // Keep alive closure. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5185 G1CopyingKeepAliveClosure keep_alive(this, copy_non_heap_cl, copy_perm_cl, &pss); |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5186 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5187 // Serial Complete GC closure |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5188 G1STWDrainQueueClosure drain_queue(this, &pss); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
3973
diff
changeset
|
5189 |
|
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5190 // Setup the soft refs policy... |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5191 rp->setup_policy(false); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5192 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5193 if (!rp->processing_is_mt()) { |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5194 // Serial reference processing... |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5195 rp->process_discovered_references(&is_alive, |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5196 &keep_alive, |
|
4dfb2df418f2
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parents:
3973
diff
changeset
|
5197 &drain_queue, |
|
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|
5198 NULL); |
|
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|
5199 } else { |
|
4dfb2df418f2
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|
5200 // Parallel reference processing |
|
4dfb2df418f2
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diff
changeset
|
5201 int active_workers = (ParallelGCThreads > 0 ? workers()->total_workers() : 1); |
|
4dfb2df418f2
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|
5202 assert(rp->num_q() == active_workers, "sanity"); |
|
4dfb2df418f2
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|
5203 assert(active_workers <= rp->max_num_q(), "sanity"); |
|
4dfb2df418f2
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|
5204 |
|
4dfb2df418f2
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diff
changeset
|
5205 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
|
4dfb2df418f2
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|
5206 rp->process_discovered_references(&is_alive, &keep_alive, &drain_queue, &par_task_executor); |
|
4dfb2df418f2
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|
5207 } |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
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|
5208 |
|
4dfb2df418f2
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|
5209 // We have completed copying any necessary live referent objects |
|
4dfb2df418f2
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|
5210 // (that were not copied during the actual pause) so we can |
|
4dfb2df418f2
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diff
changeset
|
5211 // retire any active alloc buffers |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5212 pss.retire_alloc_buffers(); |
|
4dfb2df418f2
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johnc
parents:
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diff
changeset
|
5213 assert(pss.refs()->is_empty(), "both queue and overflow should be empty"); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
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|
5214 |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
5215 double ref_proc_time = os::elapsedTime() - ref_proc_start; |
|
4dfb2df418f2
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parents:
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changeset
|
5216 g1_policy()->record_ref_proc_time(ref_proc_time * 1000.0); |
|
4dfb2df418f2
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johnc
parents:
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|
5217 } |
|
4dfb2df418f2
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diff
changeset
|
5218 |
|
4dfb2df418f2
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diff
changeset
|
5219 // Weak Reference processing during an evacuation pause (part 2). |
|
4dfb2df418f2
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|
5220 void G1CollectedHeap::enqueue_discovered_references() { |
|
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changeset
|
5221 double ref_enq_start = os::elapsedTime(); |
|
4dfb2df418f2
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changeset
|
5222 |
|
4dfb2df418f2
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diff
changeset
|
5223 ReferenceProcessor* rp = _ref_processor_stw; |
|
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|
5224 assert(!rp->discovery_enabled(), "should have been disabled as part of processing"); |
|
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diff
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|
5225 |
|
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changeset
|
5226 // Now enqueue any remaining on the discovered lists on to |
|
4dfb2df418f2
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diff
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|
5227 // the pending list. |
|
4dfb2df418f2
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diff
changeset
|
5228 if (!rp->processing_is_mt()) { |
|
4dfb2df418f2
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diff
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|
5229 // Serial reference processing... |
|
4dfb2df418f2
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diff
changeset
|
5230 rp->enqueue_discovered_references(); |
|
4dfb2df418f2
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parents:
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diff
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|
5231 } else { |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5232 // Parallel reference enqueuing |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5233 |
|
4dfb2df418f2
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diff
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|
5234 int active_workers = (ParallelGCThreads > 0 ? workers()->total_workers() : 1); |
|
4dfb2df418f2
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|
5235 assert(rp->num_q() == active_workers, "sanity"); |
|
4dfb2df418f2
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|
5236 assert(active_workers <= rp->max_num_q(), "sanity"); |
|
4dfb2df418f2
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diff
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|
5237 |
|
4dfb2df418f2
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diff
changeset
|
5238 G1STWRefProcTaskExecutor par_task_executor(this, workers(), _task_queues, active_workers); |
|
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|
5239 rp->enqueue_discovered_references(&par_task_executor); |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5240 } |
|
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diff
changeset
|
5241 |
|
4dfb2df418f2
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diff
changeset
|
5242 rp->verify_no_references_recorded(); |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5243 assert(!rp->discovery_enabled(), "should have been disabled"); |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5244 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5245 // FIXME |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5246 // CM's reference processing also cleans up the string and symbol tables. |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5247 // Should we do that here also? We could, but it is a serial operation |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5248 // and could signicantly increase the pause time. |
|
4dfb2df418f2
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johnc
parents:
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diff
changeset
|
5249 |
|
4dfb2df418f2
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parents:
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diff
changeset
|
5250 double ref_enq_time = os::elapsedTime() - ref_enq_start; |
|
4dfb2df418f2
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diff
changeset
|
5251 g1_policy()->record_ref_enq_time(ref_enq_time * 1000.0); |
|
4dfb2df418f2
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parents:
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diff
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|
5252 } |
|
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diff
changeset
|
5253 |
| 342 | 5254 void G1CollectedHeap::evacuate_collection_set() { |
| 5255 set_evacuation_failed(false); | |
| 5256 | |
| 5257 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
| 5258 concurrent_g1_refine()->set_use_cache(false); | |
| 889 | 5259 concurrent_g1_refine()->clear_hot_cache_claimed_index(); |
| 5260 | |
| 342 | 5261 int n_workers = (ParallelGCThreads > 0 ? workers()->total_workers() : 1); |
| 5262 set_par_threads(n_workers); | |
| 5263 G1ParTask g1_par_task(this, n_workers, _task_queues); | |
| 5264 | |
| 5265 init_for_evac_failure(NULL); | |
| 5266 | |
| 5267 rem_set()->prepare_for_younger_refs_iterate(true); | |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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parents:
595
diff
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|
5268 |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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595
diff
changeset
|
5269 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
| 342 | 5270 double start_par = os::elapsedTime(); |
|
3979
4dfb2df418f2
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parents:
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diff
changeset
|
5271 |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
5272 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 5273 // 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
|
5274 StrongRootsScope srs(this); |
| 1709 | 5275 if (ParallelGCVerbose) G1ParScanThreadState::print_termination_stats_hdr(); |
| 342 | 5276 workers()->run_task(&g1_par_task); |
| 5277 } else { | |
|
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
5278 StrongRootsScope srs(this); |
| 342 | 5279 g1_par_task.work(0); |
| 5280 } | |
| 5281 | |
| 5282 double par_time = (os::elapsedTime() - start_par) * 1000.0; | |
| 5283 g1_policy()->record_par_time(par_time); | |
| 5284 set_par_threads(0); | |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5285 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5286 // Process any discovered reference objects - we have |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5287 // to do this _before_ we retire the GC alloc regions |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5288 // as we may have to copy some 'reachable' referent |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5289 // objects (and their reachable sub-graphs) that were |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5290 // not copied during the pause. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5291 process_discovered_references(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5292 |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5293 // Weak root processing. |
|
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
5294 // 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
|
5295 // 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
|
5296 // here too. |
| 342 | 5297 { |
|
3979
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parents:
3973
diff
changeset
|
5298 G1STWIsAliveClosure is_alive(this); |
| 342 | 5299 G1KeepAliveClosure keep_alive(this); |
| 5300 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
| 5301 } | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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parents:
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diff
changeset
|
5302 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5303 release_gc_alloc_regions(); |
| 342 | 5304 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); |
|
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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595
diff
changeset
|
5305 |
| 889 | 5306 concurrent_g1_refine()->clear_hot_cache(); |
| 342 | 5307 concurrent_g1_refine()->set_use_cache(true); |
| 5308 | |
| 5309 finalize_for_evac_failure(); | |
| 5310 | |
| 5311 // Must do this before removing self-forwarding pointers, which clears | |
| 5312 // the per-region evac-failure flags. | |
| 5313 concurrent_mark()->complete_marking_in_collection_set(); | |
| 5314 | |
| 5315 if (evacuation_failed()) { | |
| 5316 remove_self_forwarding_pointers(); | |
| 5317 if (PrintGCDetails) { | |
|
1719
b63010841f78
6975964: G1: print out a more descriptive message for evacuation failure when +PrintGCDetails is set
tonyp
parents:
1718
diff
changeset
|
5318 gclog_or_tty->print(" (to-space overflow)"); |
| 342 | 5319 } else if (PrintGC) { |
| 5320 gclog_or_tty->print("--"); | |
| 5321 } | |
| 5322 } | |
| 5323 | |
|
3979
4dfb2df418f2
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3973
diff
changeset
|
5324 // Enqueue any remaining references remaining on the STW |
|
4dfb2df418f2
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johnc
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3973
diff
changeset
|
5325 // reference processor's discovered lists. We need to do |
|
4dfb2df418f2
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johnc
parents:
3973
diff
changeset
|
5326 // this after the card table is cleaned (and verified) as |
|
4dfb2df418f2
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3973
diff
changeset
|
5327 // the act of enqueuing entries on to the pending list |
|
4dfb2df418f2
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3973
diff
changeset
|
5328 // will log these updates (and dirty their associated |
|
4dfb2df418f2
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johnc
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3973
diff
changeset
|
5329 // cards). We need these updates logged to update any |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3973
diff
changeset
|
5330 // RSets. |
|
4dfb2df418f2
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johnc
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3973
diff
changeset
|
5331 enqueue_discovered_references(); |
|
4dfb2df418f2
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3973
diff
changeset
|
5332 |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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595
diff
changeset
|
5333 if (G1DeferredRSUpdate) { |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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595
diff
changeset
|
5334 RedirtyLoggedCardTableEntryFastClosure redirty; |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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595
diff
changeset
|
5335 dirty_card_queue_set().set_closure(&redirty); |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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595
diff
changeset
|
5336 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
| 1111 | 5337 |
| 5338 DirtyCardQueueSet& dcq = JavaThread::dirty_card_queue_set(); | |
| 5339 dcq.merge_bufferlists(&dirty_card_queue_set()); | |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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595
diff
changeset
|
5340 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
|
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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595
diff
changeset
|
5341 } |
| 342 | 5342 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
| 5343 } | |
| 5344 | |
| 2173 | 5345 void G1CollectedHeap::free_region_if_empty(HeapRegion* hr, |
| 2152 | 5346 size_t* pre_used, |
| 5347 FreeRegionList* free_list, | |
| 5348 HumongousRegionSet* humongous_proxy_set, | |
| 2173 | 5349 HRRSCleanupTask* hrrs_cleanup_task, |
| 2152 | 5350 bool par) { |
| 5351 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { | |
| 5352 if (hr->isHumongous()) { | |
| 5353 assert(hr->startsHumongous(), "we should only see starts humongous"); | |
| 5354 free_humongous_region(hr, pre_used, free_list, humongous_proxy_set, par); | |
| 5355 } else { | |
| 5356 free_region(hr, pre_used, free_list, par); | |
| 342 | 5357 } |
| 2173 | 5358 } else { |
| 5359 hr->rem_set()->do_cleanup_work(hrrs_cleanup_task); | |
| 342 | 5360 } |
| 5361 } | |
| 5362 | |
| 2152 | 5363 void G1CollectedHeap::free_region(HeapRegion* hr, |
| 5364 size_t* pre_used, | |
| 5365 FreeRegionList* free_list, | |
| 5366 bool par) { | |
| 5367 assert(!hr->isHumongous(), "this is only for non-humongous regions"); | |
| 5368 assert(!hr->is_empty(), "the region should not be empty"); | |
| 5369 assert(free_list != NULL, "pre-condition"); | |
| 5370 | |
| 5371 *pre_used += hr->used(); | |
| 5372 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
|
5373 free_list->add_as_head(hr); |
| 2152 | 5374 } |
| 5375 | |
| 5376 void G1CollectedHeap::free_humongous_region(HeapRegion* hr, | |
| 5377 size_t* pre_used, | |
| 5378 FreeRegionList* free_list, | |
| 5379 HumongousRegionSet* humongous_proxy_set, | |
| 5380 bool par) { | |
| 5381 assert(hr->startsHumongous(), "this is only for starts humongous regions"); | |
| 5382 assert(free_list != NULL, "pre-condition"); | |
| 5383 assert(humongous_proxy_set != NULL, "pre-condition"); | |
| 5384 | |
| 5385 size_t hr_used = hr->used(); | |
| 5386 size_t hr_capacity = hr->capacity(); | |
| 5387 size_t hr_pre_used = 0; | |
| 5388 _humongous_set.remove_with_proxy(hr, humongous_proxy_set); | |
| 5389 hr->set_notHumongous(); | |
| 5390 free_region(hr, &hr_pre_used, free_list, par); | |
| 5391 | |
| 3766 | 5392 size_t i = hr->hrs_index() + 1; |
| 2152 | 5393 size_t num = 1; |
| 3766 | 5394 while (i < n_regions()) { |
| 5395 HeapRegion* curr_hr = region_at(i); | |
| 2152 | 5396 if (!curr_hr->continuesHumongous()) { |
| 5397 break; | |
| 5398 } | |
| 5399 curr_hr->set_notHumongous(); | |
| 5400 free_region(curr_hr, &hr_pre_used, free_list, par); | |
| 5401 num += 1; | |
| 5402 i += 1; | |
| 5403 } | |
| 5404 assert(hr_pre_used == hr_used, | |
| 5405 err_msg("hr_pre_used: "SIZE_FORMAT" and hr_used: "SIZE_FORMAT" " | |
| 5406 "should be the same", hr_pre_used, hr_used)); | |
| 5407 *pre_used += hr_pre_used; | |
| 5408 } | |
| 5409 | |
| 5410 void G1CollectedHeap::update_sets_after_freeing_regions(size_t pre_used, | |
| 5411 FreeRegionList* free_list, | |
| 5412 HumongousRegionSet* humongous_proxy_set, | |
| 5413 bool par) { | |
| 5414 if (pre_used > 0) { | |
| 5415 Mutex* lock = (par) ? ParGCRareEvent_lock : NULL; | |
| 342 | 5416 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); |
| 2152 | 5417 assert(_summary_bytes_used >= pre_used, |
| 5418 err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" " | |
| 5419 "should be >= pre_used: "SIZE_FORMAT, | |
| 5420 _summary_bytes_used, pre_used)); | |
| 342 | 5421 _summary_bytes_used -= pre_used; |
| 2152 | 5422 } |
| 5423 if (free_list != NULL && !free_list->is_empty()) { | |
| 5424 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
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|
5425 _free_list.add_as_head(free_list); |
| 2152 | 5426 } |
| 5427 if (humongous_proxy_set != NULL && !humongous_proxy_set->is_empty()) { | |
| 5428 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
| 5429 _humongous_set.update_from_proxy(humongous_proxy_set); | |
| 342 | 5430 } |
| 5431 } | |
| 5432 | |
|
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|
5433 class G1ParCleanupCTTask : public AbstractGangTask { |
|
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|
5434 CardTableModRefBS* _ct_bs; |
|
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|
5435 G1CollectedHeap* _g1h; |
|
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|
5436 HeapRegion* volatile _su_head; |
|
796
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|
5437 public: |
|
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|
5438 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
|
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|
5439 G1CollectedHeap* g1h) : |
|
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|
5440 AbstractGangTask("G1 Par Cleanup CT Task"), |
|
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|
5441 _ct_bs(ct_bs), _g1h(g1h) { } |
|
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|
5442 |
|
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|
5443 void work(int i) { |
|
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6819065: G1: eliminate high serial card table clearing time
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|
5444 HeapRegion* r; |
|
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|
5445 while (r = _g1h->pop_dirty_cards_region()) { |
|
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|
5446 clear_cards(r); |
|
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|
5447 } |
|
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|
5448 } |
|
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|
5449 |
|
796
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|
5450 void clear_cards(HeapRegion* r) { |
|
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|
5451 // Cards of the survivors should have already been dirtied. |
|
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|
5452 if (!r->is_survivor()) { |
|
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|
5453 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
|
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|
5454 } |
|
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|
5455 } |
|
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|
5456 }; |
|
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|
5457 |
|
940
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|
5458 #ifndef PRODUCT |
|
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|
5459 class G1VerifyCardTableCleanup: public HeapRegionClosure { |
|
3317
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|
5460 G1CollectedHeap* _g1h; |
|
940
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|
5461 CardTableModRefBS* _ct_bs; |
|
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diff
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|
5462 public: |
|
3317
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|
5463 G1VerifyCardTableCleanup(G1CollectedHeap* g1h, CardTableModRefBS* ct_bs) |
|
063382f9b575
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|
5464 : _g1h(g1h), _ct_bs(ct_bs) { } |
|
2433
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|
5465 virtual bool doHeapRegion(HeapRegion* r) { |
|
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|
5466 if (r->is_survivor()) { |
|
3317
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|
5467 _g1h->verify_dirty_region(r); |
|
940
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|
5468 } else { |
|
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changeset
|
5469 _g1h->verify_not_dirty_region(r); |
|
940
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|
5470 } |
|
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diff
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|
5471 return false; |
|
8624da129f0b
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936
diff
changeset
|
5472 } |
|
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|
5473 }; |
|
2433
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diff
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|
5474 |
|
3317
063382f9b575
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diff
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|
5475 void G1CollectedHeap::verify_not_dirty_region(HeapRegion* hr) { |
|
063382f9b575
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|
5476 // All of the region should be clean. |
|
063382f9b575
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changeset
|
5477 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); |
|
063382f9b575
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changeset
|
5478 MemRegion mr(hr->bottom(), hr->end()); |
|
063382f9b575
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changeset
|
5479 ct_bs->verify_not_dirty_region(mr); |
|
063382f9b575
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diff
changeset
|
5480 } |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
changeset
|
5481 |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
changeset
|
5482 void G1CollectedHeap::verify_dirty_region(HeapRegion* hr) { |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
changeset
|
5483 // We cannot guarantee that [bottom(),end()] is dirty. Threads |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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3293
diff
changeset
|
5484 // dirty allocated blocks as they allocate them. The thread that |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3293
diff
changeset
|
5485 // retires each region and replaces it with a new one will do a |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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3293
diff
changeset
|
5486 // maximal allocation to fill in [pre_dummy_top(),end()] but will |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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3293
diff
changeset
|
5487 // not dirty that area (one less thing to have to do while holding |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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3293
diff
changeset
|
5488 // a lock). So we can only verify that [bottom(),pre_dummy_top()] |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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3293
diff
changeset
|
5489 // is dirty. |
|
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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3293
diff
changeset
|
5490 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
|
063382f9b575
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diff
changeset
|
5491 MemRegion mr(hr->bottom(), hr->pre_dummy_top()); |
|
063382f9b575
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diff
changeset
|
5492 ct_bs->verify_dirty_region(mr); |
|
063382f9b575
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changeset
|
5493 } |
|
063382f9b575
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diff
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|
5494 |
|
2433
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diff
changeset
|
5495 void G1CollectedHeap::verify_dirty_young_list(HeapRegion* head) { |
|
3317
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changeset
|
5496 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
|
2433
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diff
changeset
|
5497 for (HeapRegion* hr = head; hr != NULL; hr = hr->get_next_young_region()) { |
|
3317
063382f9b575
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diff
changeset
|
5498 verify_dirty_region(hr); |
|
2433
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2432
diff
changeset
|
5499 } |
|
abdfc822206f
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2432
diff
changeset
|
5500 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
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|
5501 |
|
abdfc822206f
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diff
changeset
|
5502 void G1CollectedHeap::verify_dirty_young_regions() { |
|
abdfc822206f
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|
5503 verify_dirty_young_list(_young_list->first_region()); |
|
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|
5504 verify_dirty_young_list(_young_list->first_survivor_region()); |
|
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|
5505 } |
|
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|
5506 #endif |
|
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diff
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|
5507 |
| 342 | 5508 void G1CollectedHeap::cleanUpCardTable() { |
| 5509 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
| 5510 double start = os::elapsedTime(); | |
| 5511 | |
|
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|
5512 // Iterate over the dirty cards region list. |
|
3830
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|
5513 G1ParCleanupCTTask cleanup_task(ct_bs, this); |
|
1394
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|
5514 |
|
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|
5515 if (ParallelGCThreads > 0) { |
|
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|
5516 set_par_threads(workers()->total_workers()); |
|
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|
5517 workers()->run_task(&cleanup_task); |
|
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diff
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|
5518 set_par_threads(0); |
|
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diff
changeset
|
5519 } else { |
|
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changeset
|
5520 while (_dirty_cards_region_list) { |
|
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diff
changeset
|
5521 HeapRegion* r = _dirty_cards_region_list; |
|
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|
5522 cleanup_task.clear_cards(r); |
|
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diff
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|
5523 _dirty_cards_region_list = r->get_next_dirty_cards_region(); |
|
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diff
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|
5524 if (_dirty_cards_region_list == r) { |
|
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794
diff
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|
5525 // The last region. |
|
29e7d79232b9
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diff
changeset
|
5526 _dirty_cards_region_list = NULL; |
|
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diff
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|
5527 } |
|
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794
diff
changeset
|
5528 r->set_next_dirty_cards_region(NULL); |
|
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794
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|
5529 } |
|
940
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|
5530 } |
|
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diff
changeset
|
5531 |
| 342 | 5532 double elapsed = os::elapsedTime() - start; |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3973
diff
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|
5533 g1_policy()->record_clear_ct_time(elapsed * 1000.0); |
|
940
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diff
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|
5534 #ifndef PRODUCT |
|
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936
diff
changeset
|
5535 if (G1VerifyCTCleanup || VerifyAfterGC) { |
|
3317
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|
5536 G1VerifyCardTableCleanup cleanup_verifier(this, ct_bs); |
|
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|
5537 heap_region_iterate(&cleanup_verifier); |
|
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|
5538 } |
|
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|
5539 #endif |
| 342 | 5540 } |
| 5541 | |
| 5542 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
| 2152 | 5543 size_t pre_used = 0; |
| 5544 FreeRegionList local_free_list("Local List for CSet Freeing"); | |
| 5545 | |
| 342 | 5546 double young_time_ms = 0.0; |
| 5547 double non_young_time_ms = 0.0; | |
| 5548 | |
|
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|
5549 // Since the collection set is a superset of the the young list, |
|
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|
5550 // all we need to do to clear the young list is clear its |
|
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|
5551 // head and length, and unlink any young regions in the code below |
|
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|
5552 _young_list->clear(); |
|
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|
5553 |
| 342 | 5554 G1CollectorPolicy* policy = g1_policy(); |
| 5555 | |
| 5556 double start_sec = os::elapsedTime(); | |
| 5557 bool non_young = true; | |
| 5558 | |
| 5559 HeapRegion* cur = cs_head; | |
| 5560 int age_bound = -1; | |
| 5561 size_t rs_lengths = 0; | |
| 5562 | |
| 5563 while (cur != NULL) { | |
| 2361 | 5564 assert(!is_on_master_free_list(cur), "sanity"); |
| 2152 | 5565 |
| 342 | 5566 if (non_young) { |
| 5567 if (cur->is_young()) { | |
| 5568 double end_sec = os::elapsedTime(); | |
| 5569 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 5570 non_young_time_ms += elapsed_ms; | |
| 5571 | |
| 5572 start_sec = os::elapsedTime(); | |
| 5573 non_young = false; | |
| 5574 } | |
| 5575 } else { | |
| 2152 | 5576 double end_sec = os::elapsedTime(); |
| 5577 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 5578 young_time_ms += elapsed_ms; | |
| 5579 | |
| 5580 start_sec = os::elapsedTime(); | |
| 5581 non_young = true; | |
| 342 | 5582 } |
| 5583 | |
| 5584 rs_lengths += cur->rem_set()->occupied(); | |
| 5585 | |
| 5586 HeapRegion* next = cur->next_in_collection_set(); | |
| 5587 assert(cur->in_collection_set(), "bad CS"); | |
| 5588 cur->set_next_in_collection_set(NULL); | |
| 5589 cur->set_in_collection_set(false); | |
| 5590 | |
| 5591 if (cur->is_young()) { | |
| 5592 int index = cur->young_index_in_cset(); | |
| 5593 guarantee( index != -1, "invariant" ); | |
| 5594 guarantee( (size_t)index < policy->young_cset_length(), "invariant" ); | |
| 5595 size_t words_survived = _surviving_young_words[index]; | |
| 5596 cur->record_surv_words_in_group(words_survived); | |
|
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|
5597 |
|
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|
5598 // At this point the we have 'popped' cur from the collection set |
|
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|
5599 // (linked via next_in_collection_set()) but it is still in the |
|
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|
5600 // young list (linked via next_young_region()). Clear the |
|
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|
5601 // _next_young_region field. |
|
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|
5602 cur->set_next_young_region(NULL); |
| 342 | 5603 } else { |
| 5604 int index = cur->young_index_in_cset(); | |
| 5605 guarantee( index == -1, "invariant" ); | |
| 5606 } | |
| 5607 | |
| 5608 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
| 5609 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
| 5610 "invariant" ); | |
| 5611 | |
| 5612 if (!cur->evacuation_failed()) { | |
| 5613 // And the region is empty. | |
| 2152 | 5614 assert(!cur->is_empty(), "Should not have empty regions in a CS."); |
| 5615 free_region(cur, &pre_used, &local_free_list, false /* par */); | |
| 342 | 5616 } else { |
| 5617 cur->uninstall_surv_rate_group(); | |
| 5618 if (cur->is_young()) | |
| 5619 cur->set_young_index_in_cset(-1); | |
| 5620 cur->set_not_young(); | |
| 5621 cur->set_evacuation_failed(false); | |
| 5622 } | |
| 5623 cur = next; | |
| 5624 } | |
| 5625 | |
| 5626 policy->record_max_rs_lengths(rs_lengths); | |
| 5627 policy->cset_regions_freed(); | |
| 5628 | |
| 5629 double end_sec = os::elapsedTime(); | |
| 5630 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 5631 if (non_young) | |
| 5632 non_young_time_ms += elapsed_ms; | |
| 5633 else | |
| 5634 young_time_ms += elapsed_ms; | |
| 5635 | |
| 2152 | 5636 update_sets_after_freeing_regions(pre_used, &local_free_list, |
| 5637 NULL /* humongous_proxy_set */, | |
| 5638 false /* par */); | |
| 342 | 5639 policy->record_young_free_cset_time_ms(young_time_ms); |
| 5640 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
| 5641 } | |
| 5642 | |
|
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|
5643 // This routine is similar to the above but does not record |
|
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|
5644 // any policy statistics or update free lists; we are abandoning |
|
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|
5645 // the current incremental collection set in preparation of a |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5646 // full collection. After the full GC we will start to build up |
|
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|
5647 // the incremental collection set again. |
|
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|
5648 // This is only called when we're doing a full collection |
|
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|
5649 // and is immediately followed by the tearing down of the young list. |
|
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|
5650 |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5651 void G1CollectedHeap::abandon_collection_set(HeapRegion* cs_head) { |
|
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|
5652 HeapRegion* cur = cs_head; |
|
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|
5653 |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5654 while (cur != NULL) { |
|
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|
5655 HeapRegion* next = cur->next_in_collection_set(); |
|
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|
5656 assert(cur->in_collection_set(), "bad CS"); |
|
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parents:
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|
5657 cur->set_next_in_collection_set(NULL); |
|
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|
5658 cur->set_in_collection_set(false); |
|
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|
5659 cur->set_young_index_in_cset(-1); |
|
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|
5660 cur = next; |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
5661 } |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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changeset
|
5662 } |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
5663 |
| 2152 | 5664 void G1CollectedHeap::set_free_regions_coming() { |
| 5665 if (G1ConcRegionFreeingVerbose) { | |
| 5666 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
| 5667 "setting free regions coming"); | |
| 5668 } | |
| 5669 | |
| 5670 assert(!free_regions_coming(), "pre-condition"); | |
| 5671 _free_regions_coming = true; | |
| 342 | 5672 } |
| 5673 | |
| 2152 | 5674 void G1CollectedHeap::reset_free_regions_coming() { |
| 5675 { | |
| 5676 assert(free_regions_coming(), "pre-condition"); | |
| 5677 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 5678 _free_regions_coming = false; | |
| 5679 SecondaryFreeList_lock->notify_all(); | |
| 5680 } | |
| 5681 | |
| 5682 if (G1ConcRegionFreeingVerbose) { | |
| 5683 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
| 5684 "reset free regions coming"); | |
| 342 | 5685 } |
| 5686 } | |
| 5687 | |
| 2152 | 5688 void G1CollectedHeap::wait_while_free_regions_coming() { |
| 5689 // Most of the time we won't have to wait, so let's do a quick test | |
| 5690 // first before we take the lock. | |
| 5691 if (!free_regions_coming()) { | |
| 5692 return; | |
| 5693 } | |
| 5694 | |
| 5695 if (G1ConcRegionFreeingVerbose) { | |
| 5696 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
| 5697 "waiting for free regions"); | |
| 342 | 5698 } |
| 5699 | |
| 5700 { | |
| 2152 | 5701 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
| 5702 while (free_regions_coming()) { | |
| 5703 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
| 342 | 5704 } |
| 2152 | 5705 } |
| 5706 | |
| 5707 if (G1ConcRegionFreeingVerbose) { | |
| 5708 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
| 5709 "done waiting for free regions"); | |
| 5710 } | |
| 342 | 5711 } |
| 5712 | |
| 5713 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
| 5714 assert(heap_lock_held_for_gc(), | |
| 5715 "the heap lock should already be held by or for this thread"); | |
| 5716 _young_list->push_region(hr); | |
| 5717 g1_policy()->set_region_short_lived(hr); | |
| 5718 } | |
| 5719 | |
| 5720 class NoYoungRegionsClosure: public HeapRegionClosure { | |
| 5721 private: | |
| 5722 bool _success; | |
| 5723 public: | |
| 5724 NoYoungRegionsClosure() : _success(true) { } | |
| 5725 bool doHeapRegion(HeapRegion* r) { | |
| 5726 if (r->is_young()) { | |
| 5727 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
| 5728 r->bottom(), r->end()); | |
| 5729 _success = false; | |
| 5730 } | |
| 5731 return false; | |
| 5732 } | |
| 5733 bool success() { return _success; } | |
| 5734 }; | |
| 5735 | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
5736 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
|
5737 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
|
5738 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5739 if (check_heap) { |
| 342 | 5740 NoYoungRegionsClosure closure; |
| 5741 heap_region_iterate(&closure); | |
| 5742 ret = ret && closure.success(); | |
| 5743 } | |
| 5744 | |
| 5745 return ret; | |
| 5746 } | |
| 5747 | |
| 5748 void G1CollectedHeap::empty_young_list() { | |
| 5749 assert(heap_lock_held_for_gc(), | |
| 5750 "the heap lock should already be held by or for this thread"); | |
| 5751 | |
| 5752 _young_list->empty_list(); | |
| 5753 } | |
| 5754 | |
| 5755 // Done at the start of full GC. | |
| 5756 void G1CollectedHeap::tear_down_region_lists() { | |
| 2152 | 5757 _free_list.remove_all(); |
| 342 | 5758 } |
| 5759 | |
| 5760 class RegionResetter: public HeapRegionClosure { | |
| 2152 | 5761 G1CollectedHeap* _g1h; |
| 5762 FreeRegionList _local_free_list; | |
| 5763 | |
| 342 | 5764 public: |
| 2152 | 5765 RegionResetter() : _g1h(G1CollectedHeap::heap()), |
| 5766 _local_free_list("Local Free List for RegionResetter") { } | |
| 5767 | |
| 342 | 5768 bool doHeapRegion(HeapRegion* r) { |
| 5769 if (r->continuesHumongous()) return false; | |
| 5770 if (r->top() > r->bottom()) { | |
| 5771 if (r->top() < r->end()) { | |
| 5772 Copy::fill_to_words(r->top(), | |
| 5773 pointer_delta(r->end(), r->top())); | |
| 5774 } | |
| 5775 } else { | |
| 5776 assert(r->is_empty(), "tautology"); | |
| 2152 | 5777 _local_free_list.add_as_tail(r); |
| 342 | 5778 } |
| 5779 return false; | |
| 5780 } | |
| 5781 | |
| 2152 | 5782 void update_free_lists() { |
| 5783 _g1h->update_sets_after_freeing_regions(0, &_local_free_list, NULL, | |
| 5784 false /* par */); | |
| 5785 } | |
| 342 | 5786 }; |
| 5787 | |
| 5788 // Done at the end of full GC. | |
| 5789 void G1CollectedHeap::rebuild_region_lists() { | |
| 5790 // This needs to go at the end of the full GC. | |
| 5791 RegionResetter rs; | |
| 5792 heap_region_iterate(&rs); | |
| 2152 | 5793 rs.update_free_lists(); |
| 342 | 5794 } |
| 5795 | |
| 5796 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
| 5797 _refine_cte_cl->set_concurrent(concurrent); | |
| 5798 } | |
| 5799 | |
| 5800 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
| 5801 HeapRegion* hr = heap_region_containing(p); | |
| 5802 if (hr == NULL) { | |
| 5803 return is_in_permanent(p); | |
| 5804 } else { | |
| 5805 return hr->is_in(p); | |
| 5806 } | |
| 5807 } | |
| 2152 | 5808 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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3824
diff
changeset
|
5809 // Methods for the mutator alloc region |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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3824
diff
changeset
|
5810 |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
changeset
|
5811 HeapRegion* G1CollectedHeap::new_mutator_alloc_region(size_t word_size, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
changeset
|
5812 bool force) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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parents:
2432
diff
changeset
|
5813 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
5814 assert(!force || g1_policy()->can_expand_young_list(), |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5815 "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
|
5816 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
|
5817 if (force || !young_list_full) { |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
changeset
|
5818 HeapRegion* new_alloc_region = new_region(word_size, |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
5819 false /* do_expand */); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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diff
changeset
|
5820 if (new_alloc_region != NULL) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
changeset
|
5821 g1_policy()->update_region_num(true /* next_is_young */); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
changeset
|
5822 set_region_short_lived_locked(new_alloc_region); |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
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3777
diff
changeset
|
5823 _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
|
5824 return new_alloc_region; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
5825 } |
|
abdfc822206f
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tonyp
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2432
diff
changeset
|
5826 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5827 return NULL; |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5828 } |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5829 |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5830 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
|
5831 size_t allocated_bytes) { |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
5832 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
|
5833 assert(alloc_region->is_young(), "all mutator alloc regions should be young"); |
|
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7023069: G1: Introduce symmetric locking in the slow allocation path
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|
5834 |
|
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|
5835 g1_policy()->add_region_to_incremental_cset_lhs(alloc_region); |
|
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|
5836 _summary_bytes_used += allocated_bytes; |
|
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
5837 _hr_printer.retire(alloc_region); |
|
3980
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
tonyp
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3979
diff
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|
5838 // We update the eden sizes here, when the region is retired, |
|
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
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|
5839 // instead of when it's allocated, since this is the point that its |
|
8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
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|
5840 // used space has been recored in _summary_bytes_used. |
|
8229bd737950
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|
5841 g1mm()->update_eden_size(); |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
5842 } |
|
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|
5843 |
|
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|
5844 HeapRegion* MutatorAllocRegion::allocate_new_region(size_t word_size, |
|
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|
5845 bool force) { |
|
abdfc822206f
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|
5846 return _g1h->new_mutator_alloc_region(word_size, force); |
|
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
5847 } |
|
abdfc822206f
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|
5848 |
|
abdfc822206f
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|
5849 void MutatorAllocRegion::retire_region(HeapRegion* alloc_region, |
|
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|
5850 size_t allocated_bytes) { |
|
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|
5851 _g1h->retire_mutator_alloc_region(alloc_region, allocated_bytes); |
|
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|
5852 } |
|
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|
5853 |
|
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
5854 // Methods for the GC alloc regions |
|
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|
5855 |
|
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|
5856 HeapRegion* G1CollectedHeap::new_gc_alloc_region(size_t word_size, |
|
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|
5857 size_t count, |
|
f44782f04dd4
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|
5858 GCAllocPurpose ap) { |
|
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|
5859 assert(FreeList_lock->owned_by_self(), "pre-condition"); |
|
f44782f04dd4
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|
5860 |
|
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|
5861 if (count < g1_policy()->max_regions(ap)) { |
|
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|
5862 HeapRegion* new_alloc_region = new_region(word_size, |
|
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|
5863 true /* do_expand */); |
|
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|
5864 if (new_alloc_region != NULL) { |
|
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|
5865 // We really only need to do this for old regions given that we |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
5866 // should never scan survivors. But it doesn't hurt to do it |
|
f44782f04dd4
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|
5867 // for survivors too. |
|
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|
5868 new_alloc_region->set_saved_mark(); |
|
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|
5869 if (ap == GCAllocForSurvived) { |
|
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|
5870 new_alloc_region->set_survivor(); |
|
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|
5871 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Survivor); |
|
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|
5872 } else { |
|
f44782f04dd4
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|
5873 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Old); |
|
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
5874 } |
|
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|
5875 return new_alloc_region; |
|
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
5876 } else { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
5877 g1_policy()->note_alloc_region_limit_reached(ap); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
5878 } |
|
f44782f04dd4
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|
5879 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
5880 return NULL; |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
5881 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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changeset
|
5882 |
|
f44782f04dd4
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|
5883 void G1CollectedHeap::retire_gc_alloc_region(HeapRegion* alloc_region, |
|
f44782f04dd4
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|
5884 size_t allocated_bytes, |
|
f44782f04dd4
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|
5885 GCAllocPurpose ap) { |
|
f44782f04dd4
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|
5886 alloc_region->note_end_of_copying(); |
|
f44782f04dd4
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|
5887 g1_policy()->record_bytes_copied_during_gc(allocated_bytes); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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|
5888 if (ap == GCAllocForSurvived) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
5889 young_list()->add_survivor_region(alloc_region); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
5890 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
5891 _hr_printer.retire(alloc_region); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
5892 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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3824
diff
changeset
|
5893 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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changeset
|
5894 HeapRegion* SurvivorGCAllocRegion::allocate_new_region(size_t word_size, |
|
f44782f04dd4
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diff
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|
5895 bool force) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
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diff
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|
5896 assert(!force, "not supported for GC alloc regions"); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
5897 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForSurvived); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
5898 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
5899 |
|
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
|
5900 void SurvivorGCAllocRegion::retire_region(HeapRegion* alloc_region, |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
5901 size_t allocated_bytes) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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3824
diff
changeset
|
5902 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
5903 GCAllocForSurvived); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
5904 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
5905 |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
changeset
|
5906 HeapRegion* OldGCAllocRegion::allocate_new_region(size_t word_size, |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
5907 bool force) { |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
5908 assert(!force, "not supported for GC alloc regions"); |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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diff
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|
5909 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForTenured); |
|
f44782f04dd4
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|
5910 } |
|
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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changeset
|
5911 |
|
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|
5912 void OldGCAllocRegion::retire_region(HeapRegion* alloc_region, |
|
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|
5913 size_t allocated_bytes) { |
|
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|
5914 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
|
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|
5915 GCAllocForTenured); |
|
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|
5916 } |
|
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
5917 // Heap region set verification |
|
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|
5918 |
| 2152 | 5919 class VerifyRegionListsClosure : public HeapRegionClosure { |
| 5920 private: | |
| 5921 HumongousRegionSet* _humongous_set; | |
| 5922 FreeRegionList* _free_list; | |
| 5923 size_t _region_count; | |
| 5924 | |
| 5925 public: | |
| 5926 VerifyRegionListsClosure(HumongousRegionSet* humongous_set, | |
| 5927 FreeRegionList* free_list) : | |
| 5928 _humongous_set(humongous_set), _free_list(free_list), | |
| 5929 _region_count(0) { } | |
| 5930 | |
| 5931 size_t region_count() { return _region_count; } | |
| 5932 | |
| 5933 bool doHeapRegion(HeapRegion* hr) { | |
| 5934 _region_count += 1; | |
| 5935 | |
| 5936 if (hr->continuesHumongous()) { | |
| 5937 return false; | |
| 5938 } | |
| 5939 | |
| 5940 if (hr->is_young()) { | |
| 5941 // TODO | |
| 5942 } else if (hr->startsHumongous()) { | |
| 5943 _humongous_set->verify_next_region(hr); | |
| 5944 } else if (hr->is_empty()) { | |
| 5945 _free_list->verify_next_region(hr); | |
| 5946 } | |
| 5947 return false; | |
| 5948 } | |
| 5949 }; | |
| 5950 | |
| 3766 | 5951 HeapRegion* G1CollectedHeap::new_heap_region(size_t hrs_index, |
| 5952 HeapWord* bottom) { | |
| 5953 HeapWord* end = bottom + HeapRegion::GrainWords; | |
| 5954 MemRegion mr(bottom, end); | |
| 5955 assert(_g1_reserved.contains(mr), "invariant"); | |
| 5956 // This might return NULL if the allocation fails | |
| 5957 return new HeapRegion(hrs_index, _bot_shared, mr, true /* is_zeroed */); | |
| 5958 } | |
| 5959 | |
| 2152 | 5960 void G1CollectedHeap::verify_region_sets() { |
| 5961 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); | |
| 5962 | |
| 5963 // First, check the explicit lists. | |
| 5964 _free_list.verify(); | |
| 5965 { | |
| 5966 // Given that a concurrent operation might be adding regions to | |
| 5967 // the secondary free list we have to take the lock before | |
| 5968 // verifying it. | |
| 5969 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 5970 _secondary_free_list.verify(); | |
| 5971 } | |
| 5972 _humongous_set.verify(); | |
| 5973 | |
| 5974 // If a concurrent region freeing operation is in progress it will | |
| 5975 // be difficult to correctly attributed any free regions we come | |
| 5976 // across to the correct free list given that they might belong to | |
| 5977 // one of several (free_list, secondary_free_list, any local lists, | |
| 5978 // etc.). So, if that's the case we will skip the rest of the | |
| 5979 // verification operation. Alternatively, waiting for the concurrent | |
| 5980 // operation to complete will have a non-trivial effect on the GC's | |
| 5981 // operation (no concurrent operation will last longer than the | |
| 5982 // interval between two calls to verification) and it might hide | |
| 5983 // any issues that we would like to catch during testing. | |
| 5984 if (free_regions_coming()) { | |
| 5985 return; | |
| 5986 } | |
| 5987 | |
| 2361 | 5988 // Make sure we append the secondary_free_list on the free_list so |
| 5989 // that all free regions we will come across can be safely | |
| 5990 // attributed to the free_list. | |
| 5991 append_secondary_free_list_if_not_empty_with_lock(); | |
| 2152 | 5992 |
| 5993 // Finally, make sure that the region accounting in the lists is | |
| 5994 // consistent with what we see in the heap. | |
| 5995 _humongous_set.verify_start(); | |
| 5996 _free_list.verify_start(); | |
| 5997 | |
| 5998 VerifyRegionListsClosure cl(&_humongous_set, &_free_list); | |
| 5999 heap_region_iterate(&cl); | |
| 6000 | |
| 6001 _humongous_set.verify_end(); | |
| 6002 _free_list.verify_end(); | |
| 342 | 6003 } |