Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 2125:7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
Summary: Make JvmtiGCMark safe to run non-safepoint and instrument CMS
Reviewed-by: ysr, dcubed
| author | kamg |
|---|---|
| date | Mon, 10 Jan 2011 17:14:53 -0500 |
| parents | 7c5250dbd584 |
| children | ffd725ff6943 |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2010, 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" | |
| 31 #include "gc_implementation/g1/concurrentZFThread.hpp" | |
| 32 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
| 33 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
| 34 #include "gc_implementation/g1/g1MarkSweep.hpp" | |
| 35 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
| 36 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
| 37 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
| 38 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
| 39 #include "gc_implementation/g1/vm_operations_g1.hpp" | |
| 40 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
| 41 #include "memory/gcLocker.inline.hpp" | |
| 42 #include "memory/genOopClosures.inline.hpp" | |
| 43 #include "memory/generationSpec.hpp" | |
| 44 #include "oops/oop.inline.hpp" | |
| 45 #include "oops/oop.pcgc.inline.hpp" | |
| 46 #include "runtime/aprofiler.hpp" | |
| 47 #include "runtime/vmThread.hpp" | |
| 342 | 48 |
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49 size_t G1CollectedHeap::_humongous_object_threshold_in_words = 0; |
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50 |
| 342 | 51 // turn it on so that the contents of the young list (scan-only / |
| 52 // to-be-collected) are printed at "strategic" points before / during | |
| 53 // / after the collection --- this is useful for debugging | |
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54 #define YOUNG_LIST_VERBOSE 0 |
| 342 | 55 // CURRENT STATUS |
| 56 // This file is under construction. Search for "FIXME". | |
| 57 | |
| 58 // INVARIANTS/NOTES | |
| 59 // | |
| 60 // All allocation activity covered by the G1CollectedHeap interface is | |
| 1973 | 61 // serialized by acquiring the HeapLock. This happens in mem_allocate |
| 62 // and allocate_new_tlab, which are the "entry" points to the | |
| 63 // allocation code from the rest of the JVM. (Note that this does not | |
| 64 // apply to TLAB allocation, which is not part of this interface: it | |
| 65 // is done by clients of this interface.) | |
| 342 | 66 |
| 67 // Local to this file. | |
| 68 | |
| 69 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
| 70 SuspendibleThreadSet* _sts; | |
| 71 G1RemSet* _g1rs; | |
| 72 ConcurrentG1Refine* _cg1r; | |
| 73 bool _concurrent; | |
| 74 public: | |
| 75 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
| 76 G1RemSet* g1rs, | |
| 77 ConcurrentG1Refine* cg1r) : | |
| 78 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
| 79 {} | |
| 80 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 1705 | 81 bool oops_into_cset = _g1rs->concurrentRefineOneCard(card_ptr, worker_i, false); |
| 82 // This path is executed by the concurrent refine or mutator threads, | |
| 83 // concurrently, and so we do not care if card_ptr contains references | |
| 84 // that point into the collection set. | |
| 85 assert(!oops_into_cset, "should be"); | |
| 86 | |
| 342 | 87 if (_concurrent && _sts->should_yield()) { |
| 88 // Caller will actually yield. | |
| 89 return false; | |
| 90 } | |
| 91 // Otherwise, we finished successfully; return true. | |
| 92 return true; | |
| 93 } | |
| 94 void set_concurrent(bool b) { _concurrent = b; } | |
| 95 }; | |
| 96 | |
| 97 | |
| 98 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 99 int _calls; | |
| 100 G1CollectedHeap* _g1h; | |
| 101 CardTableModRefBS* _ctbs; | |
| 102 int _histo[256]; | |
| 103 public: | |
| 104 ClearLoggedCardTableEntryClosure() : | |
| 105 _calls(0) | |
| 106 { | |
| 107 _g1h = G1CollectedHeap::heap(); | |
| 108 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 109 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
| 110 } | |
| 111 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 112 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 113 _calls++; | |
| 114 unsigned char* ujb = (unsigned char*)card_ptr; | |
| 115 int ind = (int)(*ujb); | |
| 116 _histo[ind]++; | |
| 117 *card_ptr = -1; | |
| 118 } | |
| 119 return true; | |
| 120 } | |
| 121 int calls() { return _calls; } | |
| 122 void print_histo() { | |
| 123 gclog_or_tty->print_cr("Card table value histogram:"); | |
| 124 for (int i = 0; i < 256; i++) { | |
| 125 if (_histo[i] != 0) { | |
| 126 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
| 127 } | |
| 128 } | |
| 129 } | |
| 130 }; | |
| 131 | |
| 132 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 133 int _calls; | |
| 134 G1CollectedHeap* _g1h; | |
| 135 CardTableModRefBS* _ctbs; | |
| 136 public: | |
| 137 RedirtyLoggedCardTableEntryClosure() : | |
| 138 _calls(0) | |
| 139 { | |
| 140 _g1h = G1CollectedHeap::heap(); | |
| 141 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 142 } | |
| 143 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 144 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 145 _calls++; | |
| 146 *card_ptr = 0; | |
| 147 } | |
| 148 return true; | |
| 149 } | |
| 150 int calls() { return _calls; } | |
| 151 }; | |
| 152 | |
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153 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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154 public: |
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155 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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156 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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157 return true; |
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158 } |
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159 }; |
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160 |
| 342 | 161 YoungList::YoungList(G1CollectedHeap* g1h) |
| 162 : _g1h(g1h), _head(NULL), | |
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163 _length(0), |
| 342 | 164 _last_sampled_rs_lengths(0), |
| 545 | 165 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) |
| 342 | 166 { |
| 167 guarantee( check_list_empty(false), "just making sure..." ); | |
| 168 } | |
| 169 | |
| 170 void YoungList::push_region(HeapRegion *hr) { | |
| 171 assert(!hr->is_young(), "should not already be young"); | |
| 172 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
| 173 | |
| 174 hr->set_next_young_region(_head); | |
| 175 _head = hr; | |
| 176 | |
| 177 hr->set_young(); | |
| 178 double yg_surv_rate = _g1h->g1_policy()->predict_yg_surv_rate((int)_length); | |
| 179 ++_length; | |
| 180 } | |
| 181 | |
| 182 void YoungList::add_survivor_region(HeapRegion* hr) { | |
| 545 | 183 assert(hr->is_survivor(), "should be flagged as survivor region"); |
| 342 | 184 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
| 185 | |
| 186 hr->set_next_young_region(_survivor_head); | |
| 187 if (_survivor_head == NULL) { | |
| 545 | 188 _survivor_tail = hr; |
| 342 | 189 } |
| 190 _survivor_head = hr; | |
| 191 | |
| 192 ++_survivor_length; | |
| 193 } | |
| 194 | |
| 195 void YoungList::empty_list(HeapRegion* list) { | |
| 196 while (list != NULL) { | |
| 197 HeapRegion* next = list->get_next_young_region(); | |
| 198 list->set_next_young_region(NULL); | |
| 199 list->uninstall_surv_rate_group(); | |
| 200 list->set_not_young(); | |
| 201 list = next; | |
| 202 } | |
| 203 } | |
| 204 | |
| 205 void YoungList::empty_list() { | |
| 206 assert(check_list_well_formed(), "young list should be well formed"); | |
| 207 | |
| 208 empty_list(_head); | |
| 209 _head = NULL; | |
| 210 _length = 0; | |
| 211 | |
| 212 empty_list(_survivor_head); | |
| 213 _survivor_head = NULL; | |
| 545 | 214 _survivor_tail = NULL; |
| 342 | 215 _survivor_length = 0; |
| 216 | |
| 217 _last_sampled_rs_lengths = 0; | |
| 218 | |
| 219 assert(check_list_empty(false), "just making sure..."); | |
| 220 } | |
| 221 | |
| 222 bool YoungList::check_list_well_formed() { | |
| 223 bool ret = true; | |
| 224 | |
| 225 size_t length = 0; | |
| 226 HeapRegion* curr = _head; | |
| 227 HeapRegion* last = NULL; | |
| 228 while (curr != NULL) { | |
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229 if (!curr->is_young()) { |
| 342 | 230 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " |
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231 "incorrectly tagged (y: %d, surv: %d)", |
| 342 | 232 curr->bottom(), curr->end(), |
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233 curr->is_young(), curr->is_survivor()); |
| 342 | 234 ret = false; |
| 235 } | |
| 236 ++length; | |
| 237 last = curr; | |
| 238 curr = curr->get_next_young_region(); | |
| 239 } | |
| 240 ret = ret && (length == _length); | |
| 241 | |
| 242 if (!ret) { | |
| 243 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
| 244 gclog_or_tty->print_cr("### list has %d entries, _length is %d", | |
| 245 length, _length); | |
| 246 } | |
| 247 | |
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248 return ret; |
| 342 | 249 } |
| 250 | |
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251 bool YoungList::check_list_empty(bool check_sample) { |
| 342 | 252 bool ret = true; |
| 253 | |
| 254 if (_length != 0) { | |
| 255 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %d", | |
| 256 _length); | |
| 257 ret = false; | |
| 258 } | |
| 259 if (check_sample && _last_sampled_rs_lengths != 0) { | |
| 260 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
| 261 ret = false; | |
| 262 } | |
| 263 if (_head != NULL) { | |
| 264 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
| 265 ret = false; | |
| 266 } | |
| 267 if (!ret) { | |
| 268 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
| 269 } | |
| 270 | |
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271 return ret; |
| 342 | 272 } |
| 273 | |
| 274 void | |
| 275 YoungList::rs_length_sampling_init() { | |
| 276 _sampled_rs_lengths = 0; | |
| 277 _curr = _head; | |
| 278 } | |
| 279 | |
| 280 bool | |
| 281 YoungList::rs_length_sampling_more() { | |
| 282 return _curr != NULL; | |
| 283 } | |
| 284 | |
| 285 void | |
| 286 YoungList::rs_length_sampling_next() { | |
| 287 assert( _curr != NULL, "invariant" ); | |
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288 size_t rs_length = _curr->rem_set()->occupied(); |
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289 |
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290 _sampled_rs_lengths += rs_length; |
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291 |
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292 // The current region may not yet have been added to the |
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293 // incremental collection set (it gets added when it is |
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294 // retired as the current allocation region). |
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295 if (_curr->in_collection_set()) { |
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296 // Update the collection set policy information for this region |
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297 _g1h->g1_policy()->update_incremental_cset_info(_curr, rs_length); |
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298 } |
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299 |
| 342 | 300 _curr = _curr->get_next_young_region(); |
| 301 if (_curr == NULL) { | |
| 302 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
| 303 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
| 304 } | |
| 305 } | |
| 306 | |
| 307 void | |
| 308 YoungList::reset_auxilary_lists() { | |
| 309 guarantee( is_empty(), "young list should be empty" ); | |
| 310 assert(check_list_well_formed(), "young list should be well formed"); | |
| 311 | |
| 312 // Add survivor regions to SurvRateGroup. | |
| 313 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
| 545 | 314 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
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315 |
| 342 | 316 for (HeapRegion* curr = _survivor_head; |
| 317 curr != NULL; | |
| 318 curr = curr->get_next_young_region()) { | |
| 319 _g1h->g1_policy()->set_region_survivors(curr); | |
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320 |
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321 // The region is a non-empty survivor so let's add it to |
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322 // the incremental collection set for the next evacuation |
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323 // pause. |
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324 _g1h->g1_policy()->add_region_to_incremental_cset_rhs(curr); |
| 342 | 325 } |
| 326 _g1h->g1_policy()->note_stop_adding_survivor_regions(); | |
| 327 | |
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328 _head = _survivor_head; |
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329 _length = _survivor_length; |
| 342 | 330 if (_survivor_head != NULL) { |
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331 assert(_survivor_tail != NULL, "cause it shouldn't be"); |
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332 assert(_survivor_length > 0, "invariant"); |
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333 _survivor_tail->set_next_young_region(NULL); |
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334 } |
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335 |
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336 // Don't clear the survivor list handles until the start of |
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337 // the next evacuation pause - we need it in order to re-tag |
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338 // the survivor regions from this evacuation pause as 'young' |
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339 // at the start of the next. |
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340 |
| 545 | 341 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
| 342 | 342 |
| 343 assert(check_list_well_formed(), "young list should be well formed"); | |
| 344 } | |
| 345 | |
| 346 void YoungList::print() { | |
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347 HeapRegion* lists[] = {_head, _survivor_head}; |
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348 const char* names[] = {"YOUNG", "SURVIVOR"}; |
| 342 | 349 |
| 350 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
| 351 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
| 352 HeapRegion *curr = lists[list]; | |
| 353 if (curr == NULL) | |
| 354 gclog_or_tty->print_cr(" empty"); | |
| 355 while (curr != NULL) { | |
| 356 gclog_or_tty->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " | |
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357 "age: %4d, y: %d, surv: %d", |
| 342 | 358 curr->bottom(), curr->end(), |
| 359 curr->top(), | |
| 360 curr->prev_top_at_mark_start(), | |
| 361 curr->next_top_at_mark_start(), | |
| 362 curr->top_at_conc_mark_count(), | |
| 363 curr->age_in_surv_rate_group_cond(), | |
| 364 curr->is_young(), | |
| 365 curr->is_survivor()); | |
| 366 curr = curr->get_next_young_region(); | |
| 367 } | |
| 368 } | |
| 369 | |
| 370 gclog_or_tty->print_cr(""); | |
| 371 } | |
| 372 | |
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373 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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374 { |
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375 // Claim the right to put the region on the dirty cards region list |
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376 // by installing a self pointer. |
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377 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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378 if (next == NULL) { |
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379 HeapRegion* res = (HeapRegion*) |
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380 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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381 NULL); |
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382 if (res == NULL) { |
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383 HeapRegion* head; |
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384 do { |
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385 // Put the region to the dirty cards region list. |
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386 head = _dirty_cards_region_list; |
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387 next = (HeapRegion*) |
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388 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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389 if (next == head) { |
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390 assert(hr->get_next_dirty_cards_region() == hr, |
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391 "hr->get_next_dirty_cards_region() != hr"); |
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392 if (next == NULL) { |
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393 // The last region in the list points to itself. |
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394 hr->set_next_dirty_cards_region(hr); |
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395 } else { |
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396 hr->set_next_dirty_cards_region(next); |
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397 } |
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398 } |
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399 } while (next != head); |
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400 } |
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401 } |
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402 } |
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403 |
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404 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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405 { |
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406 HeapRegion* head; |
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407 HeapRegion* hr; |
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408 do { |
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409 head = _dirty_cards_region_list; |
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410 if (head == NULL) { |
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411 return NULL; |
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412 } |
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413 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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414 if (head == new_head) { |
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415 // The last region. |
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416 new_head = NULL; |
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417 } |
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418 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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419 head); |
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420 } while (hr != head); |
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421 assert(hr != NULL, "invariant"); |
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422 hr->set_next_dirty_cards_region(NULL); |
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423 return hr; |
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424 } |
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425 |
| 342 | 426 void G1CollectedHeap::stop_conc_gc_threads() { |
| 794 | 427 _cg1r->stop(); |
| 342 | 428 _czft->stop(); |
| 429 _cmThread->stop(); | |
| 430 } | |
| 431 | |
| 432 | |
| 433 void G1CollectedHeap::check_ct_logs_at_safepoint() { | |
| 434 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 435 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
| 436 | |
| 437 // Count the dirty cards at the start. | |
| 438 CountNonCleanMemRegionClosure count1(this); | |
| 439 ct_bs->mod_card_iterate(&count1); | |
| 440 int orig_count = count1.n(); | |
| 441 | |
| 442 // First clear the logged cards. | |
| 443 ClearLoggedCardTableEntryClosure clear; | |
| 444 dcqs.set_closure(&clear); | |
| 445 dcqs.apply_closure_to_all_completed_buffers(); | |
| 446 dcqs.iterate_closure_all_threads(false); | |
| 447 clear.print_histo(); | |
| 448 | |
| 449 // Now ensure that there's no dirty cards. | |
| 450 CountNonCleanMemRegionClosure count2(this); | |
| 451 ct_bs->mod_card_iterate(&count2); | |
| 452 if (count2.n() != 0) { | |
| 453 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
| 454 count2.n(), orig_count); | |
| 455 } | |
| 456 guarantee(count2.n() == 0, "Card table should be clean."); | |
| 457 | |
| 458 RedirtyLoggedCardTableEntryClosure redirty; | |
| 459 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
| 460 dcqs.apply_closure_to_all_completed_buffers(); | |
| 461 dcqs.iterate_closure_all_threads(false); | |
| 462 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
| 463 clear.calls(), orig_count); | |
| 464 guarantee(redirty.calls() == clear.calls(), | |
| 465 "Or else mechanism is broken."); | |
| 466 | |
| 467 CountNonCleanMemRegionClosure count3(this); | |
| 468 ct_bs->mod_card_iterate(&count3); | |
| 469 if (count3.n() != orig_count) { | |
| 470 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
| 471 orig_count, count3.n()); | |
| 472 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
| 473 } | |
| 474 | |
| 475 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 476 } | |
| 477 | |
| 478 // Private class members. | |
| 479 | |
| 480 G1CollectedHeap* G1CollectedHeap::_g1h; | |
| 481 | |
| 482 // Private methods. | |
| 483 | |
| 484 // Finds a HeapRegion that can be used to allocate a given size of block. | |
| 485 | |
| 486 | |
| 487 HeapRegion* G1CollectedHeap::newAllocRegion_work(size_t word_size, | |
| 488 bool do_expand, | |
| 489 bool zero_filled) { | |
| 490 ConcurrentZFThread::note_region_alloc(); | |
| 491 HeapRegion* res = alloc_free_region_from_lists(zero_filled); | |
| 492 if (res == NULL && do_expand) { | |
| 493 expand(word_size * HeapWordSize); | |
| 494 res = alloc_free_region_from_lists(zero_filled); | |
| 495 assert(res == NULL || | |
| 496 (!res->isHumongous() && | |
| 497 (!zero_filled || | |
| 498 res->zero_fill_state() == HeapRegion::Allocated)), | |
| 499 "Alloc Regions must be zero filled (and non-H)"); | |
| 500 } | |
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501 if (res != NULL) { |
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502 if (res->is_empty()) { |
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503 _free_regions--; |
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504 } |
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505 assert(!res->isHumongous() && |
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506 (!zero_filled || res->zero_fill_state() == HeapRegion::Allocated), |
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507 err_msg("Non-young alloc Regions must be zero filled (and non-H):" |
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508 " res->isHumongous()=%d, zero_filled=%d, res->zero_fill_state()=%d", |
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509 res->isHumongous(), zero_filled, res->zero_fill_state())); |
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510 assert(!res->is_on_unclean_list(), |
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511 "Alloc Regions must not be on the unclean list"); |
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512 if (G1PrintHeapRegions) { |
| 342 | 513 gclog_or_tty->print_cr("new alloc region %d:["PTR_FORMAT", "PTR_FORMAT"], " |
| 514 "top "PTR_FORMAT, | |
| 515 res->hrs_index(), res->bottom(), res->end(), res->top()); | |
| 516 } | |
| 517 } | |
| 518 return res; | |
| 519 } | |
| 520 | |
| 521 HeapRegion* G1CollectedHeap::newAllocRegionWithExpansion(int purpose, | |
| 522 size_t word_size, | |
| 523 bool zero_filled) { | |
| 524 HeapRegion* alloc_region = NULL; | |
| 525 if (_gc_alloc_region_counts[purpose] < g1_policy()->max_regions(purpose)) { | |
| 526 alloc_region = newAllocRegion_work(word_size, true, zero_filled); | |
| 527 if (purpose == GCAllocForSurvived && alloc_region != NULL) { | |
| 545 | 528 alloc_region->set_survivor(); |
| 342 | 529 } |
| 530 ++_gc_alloc_region_counts[purpose]; | |
| 531 } else { | |
| 532 g1_policy()->note_alloc_region_limit_reached(purpose); | |
| 533 } | |
| 534 return alloc_region; | |
| 535 } | |
| 536 | |
| 537 // If could fit into free regions w/o expansion, try. | |
| 538 // Otherwise, if can expand, do so. | |
| 539 // Otherwise, if using ex regions might help, try with ex given back. | |
| 1973 | 540 HeapWord* G1CollectedHeap::humongous_obj_allocate(size_t word_size) { |
| 541 assert_heap_locked_or_at_safepoint(); | |
| 342 | 542 assert(regions_accounted_for(), "Region leakage!"); |
| 543 | |
| 1973 | 544 // We can't allocate humongous regions while cleanupComplete is |
| 545 // running, since some of the regions we find to be empty might not | |
| 546 // yet be added to the unclean list. If we're already at a | |
| 547 // safepoint, this call is unnecessary, not to mention wrong. | |
| 548 if (!SafepointSynchronize::is_at_safepoint()) { | |
| 342 | 549 wait_for_cleanup_complete(); |
| 1973 | 550 } |
| 342 | 551 |
| 552 size_t num_regions = | |
| 1973 | 553 round_to(word_size, HeapRegion::GrainWords) / HeapRegion::GrainWords; |
| 342 | 554 |
| 555 // Special case if < one region??? | |
| 556 | |
| 557 // Remember the ft size. | |
| 558 size_t x_size = expansion_regions(); | |
| 559 | |
| 560 HeapWord* res = NULL; | |
| 561 bool eliminated_allocated_from_lists = false; | |
| 562 | |
| 563 // Can the allocation potentially fit in the free regions? | |
| 564 if (free_regions() >= num_regions) { | |
| 565 res = _hrs->obj_allocate(word_size); | |
| 566 } | |
| 567 if (res == NULL) { | |
| 568 // Try expansion. | |
| 569 size_t fs = _hrs->free_suffix(); | |
| 570 if (fs + x_size >= num_regions) { | |
| 571 expand((num_regions - fs) * HeapRegion::GrainBytes); | |
| 572 res = _hrs->obj_allocate(word_size); | |
| 573 assert(res != NULL, "This should have worked."); | |
| 574 } else { | |
| 575 // Expansion won't help. Are there enough free regions if we get rid | |
| 576 // of reservations? | |
| 577 size_t avail = free_regions(); | |
| 578 if (avail >= num_regions) { | |
| 579 res = _hrs->obj_allocate(word_size); | |
| 580 if (res != NULL) { | |
| 581 remove_allocated_regions_from_lists(); | |
| 582 eliminated_allocated_from_lists = true; | |
| 583 } | |
| 584 } | |
| 585 } | |
| 586 } | |
| 587 if (res != NULL) { | |
| 588 // Increment by the number of regions allocated. | |
| 589 // FIXME: Assumes regions all of size GrainBytes. | |
| 590 #ifndef PRODUCT | |
| 591 mr_bs()->verify_clean_region(MemRegion(res, res + num_regions * | |
| 592 HeapRegion::GrainWords)); | |
| 593 #endif | |
| 594 if (!eliminated_allocated_from_lists) | |
| 595 remove_allocated_regions_from_lists(); | |
| 596 _summary_bytes_used += word_size * HeapWordSize; | |
| 597 _free_regions -= num_regions; | |
| 598 _num_humongous_regions += (int) num_regions; | |
| 599 } | |
| 600 assert(regions_accounted_for(), "Region Leakage"); | |
| 601 return res; | |
| 602 } | |
| 603 | |
| 1973 | 604 void |
| 605 G1CollectedHeap::retire_cur_alloc_region(HeapRegion* cur_alloc_region) { | |
| 606 // The cleanup operation might update _summary_bytes_used | |
| 607 // concurrently with this method. So, right now, if we don't wait | |
| 608 // for it to complete, updates to _summary_bytes_used might get | |
| 609 // lost. This will be resolved in the near future when the operation | |
| 610 // of the free region list is revamped as part of CR 6977804. | |
| 611 wait_for_cleanup_complete(); | |
| 612 | |
| 613 retire_cur_alloc_region_common(cur_alloc_region); | |
| 614 assert(_cur_alloc_region == NULL, "post-condition"); | |
| 615 } | |
| 616 | |
| 617 // See the comment in the .hpp file about the locking protocol and | |
| 618 // assumptions of this method (and other related ones). | |
| 342 | 619 HeapWord* |
| 1973 | 620 G1CollectedHeap::replace_cur_alloc_region_and_allocate(size_t word_size, |
| 621 bool at_safepoint, | |
|
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622 bool do_dirtying, |
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623 bool can_expand) { |
| 1973 | 624 assert_heap_locked_or_at_safepoint(); |
| 625 assert(_cur_alloc_region == NULL, | |
| 626 "replace_cur_alloc_region_and_allocate() should only be called " | |
| 627 "after retiring the previous current alloc region"); | |
| 628 assert(SafepointSynchronize::is_at_safepoint() == at_safepoint, | |
| 629 "at_safepoint and is_at_safepoint() should be a tautology"); | |
|
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630 assert(!can_expand || g1_policy()->can_expand_young_list(), |
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631 "we should not call this method with can_expand == true if " |
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632 "we are not allowed to expand the young gen"); |
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633 |
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634 if (can_expand || !g1_policy()->is_young_list_full()) { |
| 1973 | 635 if (!at_safepoint) { |
| 636 // The cleanup operation might update _summary_bytes_used | |
| 637 // concurrently with this method. So, right now, if we don't | |
| 638 // wait for it to complete, updates to _summary_bytes_used might | |
| 639 // get lost. This will be resolved in the near future when the | |
| 640 // operation of the free region list is revamped as part of | |
| 641 // CR 6977804. If we're already at a safepoint, this call is | |
| 642 // unnecessary, not to mention wrong. | |
|
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643 wait_for_cleanup_complete(); |
| 342 | 644 } |
| 1973 | 645 |
| 646 HeapRegion* new_cur_alloc_region = newAllocRegion(word_size, | |
| 647 false /* zero_filled */); | |
| 648 if (new_cur_alloc_region != NULL) { | |
| 649 assert(new_cur_alloc_region->is_empty(), | |
| 650 "the newly-allocated region should be empty, " | |
| 651 "as right now we only allocate new regions out of the free list"); | |
| 652 g1_policy()->update_region_num(true /* next_is_young */); | |
| 653 _summary_bytes_used -= new_cur_alloc_region->used(); | |
| 654 set_region_short_lived_locked(new_cur_alloc_region); | |
| 655 | |
| 656 assert(!new_cur_alloc_region->isHumongous(), | |
| 657 "Catch a regression of this bug."); | |
| 658 | |
| 659 // We need to ensure that the stores to _cur_alloc_region and, | |
| 660 // subsequently, to top do not float above the setting of the | |
| 661 // young type. | |
| 662 OrderAccess::storestore(); | |
| 663 | |
| 664 // Now allocate out of the new current alloc region. We could | |
| 665 // have re-used allocate_from_cur_alloc_region() but its | |
| 666 // operation is slightly different to what we need here. First, | |
| 667 // allocate_from_cur_alloc_region() is only called outside a | |
| 668 // safepoint and will always unlock the Heap_lock if it returns | |
| 669 // a non-NULL result. Second, it assumes that the current alloc | |
| 670 // region is what's already assigned in _cur_alloc_region. What | |
| 671 // we want here is to actually do the allocation first before we | |
| 672 // assign the new region to _cur_alloc_region. This ordering is | |
| 673 // not currently important, but it will be essential when we | |
| 674 // change the code to support CAS allocation in the future (see | |
| 675 // CR 6994297). | |
| 676 // | |
| 677 // This allocate method does BOT updates and we don't need them in | |
| 678 // the young generation. This will be fixed in the near future by | |
| 679 // CR 6994297. | |
| 680 HeapWord* result = new_cur_alloc_region->allocate(word_size); | |
| 681 assert(result != NULL, "we just allocate out of an empty region " | |
| 682 "so allocation should have been successful"); | |
| 683 assert(is_in(result), "result should be in the heap"); | |
| 684 | |
| 685 _cur_alloc_region = new_cur_alloc_region; | |
| 686 | |
| 687 if (!at_safepoint) { | |
| 688 Heap_lock->unlock(); | |
| 689 } | |
| 690 | |
| 691 // do the dirtying, if necessary, after we release the Heap_lock | |
| 692 if (do_dirtying) { | |
| 693 dirty_young_block(result, word_size); | |
| 694 } | |
| 695 return result; | |
| 696 } | |
| 697 } | |
| 698 | |
| 699 assert(_cur_alloc_region == NULL, "we failed to allocate a new current " | |
| 700 "alloc region, it should still be NULL"); | |
| 701 assert_heap_locked_or_at_safepoint(); | |
| 702 return NULL; | |
| 703 } | |
| 704 | |
| 705 // See the comment in the .hpp file about the locking protocol and | |
| 706 // assumptions of this method (and other related ones). | |
| 707 HeapWord* | |
| 708 G1CollectedHeap::attempt_allocation_slow(size_t word_size) { | |
| 709 assert_heap_locked_and_not_at_safepoint(); | |
| 710 assert(!isHumongous(word_size), "attempt_allocation_slow() should not be " | |
| 711 "used for humongous allocations"); | |
| 712 | |
| 713 // We will loop while succeeded is false, which means that we tried | |
| 714 // to do a collection, but the VM op did not succeed. So, when we | |
| 715 // exit the loop, either one of the allocation attempts was | |
| 716 // successful, or we succeeded in doing the VM op but which was | |
| 717 // unable to allocate after the collection. | |
| 718 for (int try_count = 1; /* we'll return or break */; try_count += 1) { | |
| 719 bool succeeded = true; | |
| 720 | |
| 721 { | |
| 722 // We may have concurrent cleanup working at the time. Wait for | |
| 723 // it to complete. In the future we would probably want to make | |
| 724 // the concurrent cleanup truly concurrent by decoupling it from | |
| 725 // the allocation. This will happen in the near future as part | |
| 726 // of CR 6977804 which will revamp the operation of the free | |
| 727 // region list. The fact that wait_for_cleanup_complete() will | |
| 728 // do a wait() means that we'll give up the Heap_lock. So, it's | |
| 729 // possible that when we exit wait_for_cleanup_complete() we | |
| 730 // might be able to allocate successfully (since somebody else | |
| 731 // might have done a collection meanwhile). So, we'll attempt to | |
| 732 // allocate again, just in case. When we make cleanup truly | |
| 733 // concurrent with allocation, we should remove this allocation | |
| 734 // attempt as it's redundant (we only reach here after an | |
| 735 // allocation attempt has been unsuccessful). | |
| 736 wait_for_cleanup_complete(); | |
| 737 HeapWord* result = attempt_allocation(word_size); | |
| 738 if (result != NULL) { | |
| 739 assert_heap_not_locked(); | |
| 740 return result; | |
| 342 | 741 } |
| 742 } | |
| 1973 | 743 |
| 744 if (GC_locker::is_active_and_needs_gc()) { | |
|
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745 // We are locked out of GC because of the GC locker. We can |
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746 // allocate a new region only if we can expand the young gen. |
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747 |
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748 if (g1_policy()->can_expand_young_list()) { |
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749 // Yes, we are allowed to expand the young gen. Let's try to |
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750 // allocate a new current alloc region. |
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751 |
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752 HeapWord* result = |
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753 replace_cur_alloc_region_and_allocate(word_size, |
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754 false, /* at_safepoint */ |
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755 true, /* do_dirtying */ |
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756 true /* can_expand */); |
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757 if (result != NULL) { |
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758 assert_heap_not_locked(); |
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759 return result; |
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760 } |
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761 } |
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762 // We could not expand the young gen further (or we could but we |
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763 // failed to allocate a new region). We'll stall until the GC |
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|
764 // locker forces a GC. |
| 1973 | 765 |
| 766 // If this thread is not in a jni critical section, we stall | |
| 767 // the requestor until the critical section has cleared and | |
| 768 // GC allowed. When the critical section clears, a GC is | |
| 769 // initiated by the last thread exiting the critical section; so | |
| 770 // we retry the allocation sequence from the beginning of the loop, | |
| 771 // rather than causing more, now probably unnecessary, GC attempts. | |
| 772 JavaThread* jthr = JavaThread::current(); | |
| 773 assert(jthr != NULL, "sanity"); | |
| 774 if (!jthr->in_critical()) { | |
| 775 MutexUnlocker mul(Heap_lock); | |
| 776 GC_locker::stall_until_clear(); | |
| 777 | |
| 778 // We'll then fall off the end of the ("if GC locker active") | |
| 779 // if-statement and retry the allocation further down in the | |
| 780 // loop. | |
| 781 } else { | |
| 782 if (CheckJNICalls) { | |
| 783 fatal("Possible deadlock due to allocating while" | |
| 784 " in jni critical section"); | |
| 785 } | |
| 786 return NULL; | |
|
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787 } |
| 1973 | 788 } else { |
| 789 // We are not locked out. So, let's try to do a GC. The VM op | |
| 790 // will retry the allocation before it completes. | |
| 791 | |
| 792 // Read the GC count while holding the Heap_lock | |
| 793 unsigned int gc_count_before = SharedHeap::heap()->total_collections(); | |
| 794 | |
| 795 Heap_lock->unlock(); | |
| 796 | |
| 797 HeapWord* result = | |
| 798 do_collection_pause(word_size, gc_count_before, &succeeded); | |
| 799 assert_heap_not_locked(); | |
| 800 if (result != NULL) { | |
| 801 assert(succeeded, "the VM op should have succeeded"); | |
| 802 | |
| 803 // Allocations that take place on VM operations do not do any | |
| 804 // card dirtying and we have to do it here. | |
| 805 dirty_young_block(result, word_size); | |
| 806 return result; | |
| 807 } | |
| 808 | |
| 809 Heap_lock->lock(); | |
| 810 } | |
| 811 | |
| 812 assert_heap_locked(); | |
| 813 | |
| 814 // We can reach here when we were unsuccessful in doing a GC, | |
| 815 // because another thread beat us to it, or because we were locked | |
| 816 // out of GC due to the GC locker. In either case a new alloc | |
| 817 // region might be available so we will retry the allocation. | |
| 818 HeapWord* result = attempt_allocation(word_size); | |
| 819 if (result != NULL) { | |
| 820 assert_heap_not_locked(); | |
| 821 return result; | |
| 822 } | |
| 823 | |
| 824 // So far our attempts to allocate failed. The only time we'll go | |
| 825 // around the loop and try again is if we tried to do a GC and the | |
| 826 // VM op that we tried to schedule was not successful because | |
| 827 // another thread beat us to it. If that happened it's possible | |
| 828 // that by the time we grabbed the Heap_lock again and tried to | |
| 829 // allocate other threads filled up the young generation, which | |
| 830 // means that the allocation attempt after the GC also failed. So, | |
| 831 // it's worth trying to schedule another GC pause. | |
| 832 if (succeeded) { | |
| 833 break; | |
| 834 } | |
| 835 | |
| 836 // Give a warning if we seem to be looping forever. | |
| 837 if ((QueuedAllocationWarningCount > 0) && | |
| 838 (try_count % QueuedAllocationWarningCount == 0)) { | |
| 839 warning("G1CollectedHeap::attempt_allocation_slow() " | |
| 840 "retries %d times", try_count); | |
| 342 | 841 } |
| 842 } | |
| 843 | |
| 1973 | 844 assert_heap_locked(); |
| 845 return NULL; | |
| 846 } | |
| 847 | |
| 848 // See the comment in the .hpp file about the locking protocol and | |
| 849 // assumptions of this method (and other related ones). | |
| 850 HeapWord* | |
| 851 G1CollectedHeap::attempt_allocation_humongous(size_t word_size, | |
| 852 bool at_safepoint) { | |
| 853 // This is the method that will allocate a humongous object. All | |
| 854 // allocation paths that attempt to allocate a humongous object | |
| 855 // should eventually reach here. Currently, the only paths are from | |
| 856 // mem_allocate() and attempt_allocation_at_safepoint(). | |
| 857 assert_heap_locked_or_at_safepoint(); | |
| 858 assert(isHumongous(word_size), "attempt_allocation_humongous() " | |
| 859 "should only be used for humongous allocations"); | |
| 860 assert(SafepointSynchronize::is_at_safepoint() == at_safepoint, | |
| 861 "at_safepoint and is_at_safepoint() should be a tautology"); | |
| 862 | |
| 863 HeapWord* result = NULL; | |
| 864 | |
| 865 // We will loop while succeeded is false, which means that we tried | |
| 866 // to do a collection, but the VM op did not succeed. So, when we | |
| 867 // exit the loop, either one of the allocation attempts was | |
| 868 // successful, or we succeeded in doing the VM op but which was | |
| 869 // unable to allocate after the collection. | |
| 870 for (int try_count = 1; /* we'll return or break */; try_count += 1) { | |
| 871 bool succeeded = true; | |
| 872 | |
| 873 // Given that humongous objects are not allocated in young | |
| 874 // regions, we'll first try to do the allocation without doing a | |
| 875 // collection hoping that there's enough space in the heap. | |
| 876 result = humongous_obj_allocate(word_size); | |
| 877 assert(_cur_alloc_region == NULL || !_cur_alloc_region->isHumongous(), | |
| 878 "catch a regression of this bug."); | |
| 879 if (result != NULL) { | |
| 880 if (!at_safepoint) { | |
| 881 // If we're not at a safepoint, unlock the Heap_lock. | |
| 882 Heap_lock->unlock(); | |
| 883 } | |
| 884 return result; | |
| 885 } | |
| 886 | |
| 887 // If we failed to allocate the humongous object, we should try to | |
| 888 // do a collection pause (if we're allowed) in case it reclaims | |
| 889 // enough space for the allocation to succeed after the pause. | |
| 890 if (!at_safepoint) { | |
| 891 // Read the GC count while holding the Heap_lock | |
| 892 unsigned int gc_count_before = SharedHeap::heap()->total_collections(); | |
| 893 | |
| 894 // If we're allowed to do a collection we're not at a | |
| 895 // safepoint, so it is safe to unlock the Heap_lock. | |
| 342 | 896 Heap_lock->unlock(); |
| 1973 | 897 |
| 898 result = do_collection_pause(word_size, gc_count_before, &succeeded); | |
| 899 assert_heap_not_locked(); | |
| 900 if (result != NULL) { | |
| 901 assert(succeeded, "the VM op should have succeeded"); | |
| 902 return result; | |
| 903 } | |
| 904 | |
| 905 // If we get here, the VM operation either did not succeed | |
| 906 // (i.e., another thread beat us to it) or it succeeded but | |
| 907 // failed to allocate the object. | |
| 908 | |
| 909 // If we're allowed to do a collection we're not at a | |
| 910 // safepoint, so it is safe to lock the Heap_lock. | |
| 911 Heap_lock->lock(); | |
| 912 } | |
| 913 | |
| 914 assert(result == NULL, "otherwise we should have exited the loop earlier"); | |
| 915 | |
| 916 // So far our attempts to allocate failed. The only time we'll go | |
| 917 // around the loop and try again is if we tried to do a GC and the | |
| 918 // VM op that we tried to schedule was not successful because | |
| 919 // another thread beat us to it. That way it's possible that some | |
| 920 // space was freed up by the thread that successfully scheduled a | |
| 921 // GC. So it's worth trying to allocate again. | |
| 922 if (succeeded) { | |
| 923 break; | |
| 342 | 924 } |
| 925 | |
| 1973 | 926 // Give a warning if we seem to be looping forever. |
| 927 if ((QueuedAllocationWarningCount > 0) && | |
| 928 (try_count % QueuedAllocationWarningCount == 0)) { | |
| 929 warning("G1CollectedHeap::attempt_allocation_humongous " | |
| 930 "retries %d times", try_count); | |
| 931 } | |
| 932 } | |
| 933 | |
| 934 assert_heap_locked_or_at_safepoint(); | |
| 935 return NULL; | |
| 936 } | |
| 937 | |
| 938 HeapWord* G1CollectedHeap::attempt_allocation_at_safepoint(size_t word_size, | |
| 939 bool expect_null_cur_alloc_region) { | |
| 940 assert_at_safepoint(); | |
| 941 assert(_cur_alloc_region == NULL || !expect_null_cur_alloc_region, | |
|
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942 err_msg("the current alloc region was unexpectedly found " |
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943 "to be non-NULL, cur alloc region: "PTR_FORMAT" " |
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944 "expect_null_cur_alloc_region: %d word_size: "SIZE_FORMAT, |
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945 _cur_alloc_region, expect_null_cur_alloc_region, word_size)); |
| 1973 | 946 |
| 947 if (!isHumongous(word_size)) { | |
| 948 if (!expect_null_cur_alloc_region) { | |
| 949 HeapRegion* cur_alloc_region = _cur_alloc_region; | |
| 950 if (cur_alloc_region != NULL) { | |
| 951 // This allocate method does BOT updates and we don't need them in | |
| 952 // the young generation. This will be fixed in the near future by | |
| 953 // CR 6994297. | |
| 954 HeapWord* result = cur_alloc_region->allocate(word_size); | |
| 955 if (result != NULL) { | |
| 956 assert(is_in(result), "result should be in the heap"); | |
| 957 | |
| 958 // We will not do any dirtying here. This is guaranteed to be | |
| 959 // called during a safepoint and the thread that scheduled the | |
| 960 // pause will do the dirtying if we return a non-NULL result. | |
| 961 return result; | |
| 962 } | |
| 963 | |
| 964 retire_cur_alloc_region_common(cur_alloc_region); | |
| 965 } | |
| 342 | 966 } |
| 1973 | 967 |
| 968 assert(_cur_alloc_region == NULL, | |
| 969 "at this point we should have no cur alloc region"); | |
| 970 return replace_cur_alloc_region_and_allocate(word_size, | |
| 971 true, /* at_safepoint */ | |
|
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972 false /* do_dirtying */, |
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973 false /* can_expand */); |
| 1973 | 974 } else { |
| 975 return attempt_allocation_humongous(word_size, | |
| 976 true /* at_safepoint */); | |
| 977 } | |
| 978 | |
| 979 ShouldNotReachHere(); | |
| 980 } | |
| 981 | |
| 982 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t word_size) { | |
| 983 assert_heap_not_locked_and_not_at_safepoint(); | |
| 984 assert(!isHumongous(word_size), "we do not allow TLABs of humongous size"); | |
| 985 | |
| 986 Heap_lock->lock(); | |
| 987 | |
| 988 // First attempt: try allocating out of the current alloc region or | |
| 989 // after replacing the current alloc region. | |
| 990 HeapWord* result = attempt_allocation(word_size); | |
| 991 if (result != NULL) { | |
| 992 assert_heap_not_locked(); | |
| 993 return result; | |
| 994 } | |
| 995 | |
| 996 assert_heap_locked(); | |
| 997 | |
| 998 // Second attempt: go into the even slower path where we might | |
| 999 // try to schedule a collection. | |
| 1000 result = attempt_allocation_slow(word_size); | |
| 1001 if (result != NULL) { | |
| 1002 assert_heap_not_locked(); | |
| 1003 return result; | |
| 1004 } | |
| 1005 | |
| 1006 assert_heap_locked(); | |
| 1007 Heap_lock->unlock(); | |
| 1008 return NULL; | |
| 342 | 1009 } |
| 1010 | |
| 1011 HeapWord* | |
| 1012 G1CollectedHeap::mem_allocate(size_t word_size, | |
| 1013 bool is_noref, | |
| 1014 bool is_tlab, | |
| 1973 | 1015 bool* gc_overhead_limit_was_exceeded) { |
| 1016 assert_heap_not_locked_and_not_at_safepoint(); | |
| 1017 assert(!is_tlab, "mem_allocate() this should not be called directly " | |
| 1018 "to allocate TLABs"); | |
| 342 | 1019 |
| 1020 // Loop until the allocation is satisified, | |
| 1021 // or unsatisfied after GC. | |
| 1973 | 1022 for (int try_count = 1; /* we'll return */; try_count += 1) { |
| 1023 unsigned int gc_count_before; | |
| 342 | 1024 { |
| 1025 Heap_lock->lock(); | |
| 1973 | 1026 |
| 1027 if (!isHumongous(word_size)) { | |
| 1028 // First attempt: try allocating out of the current alloc | |
| 1029 // region or after replacing the current alloc region. | |
| 1030 HeapWord* result = attempt_allocation(word_size); | |
| 1031 if (result != NULL) { | |
| 1032 assert_heap_not_locked(); | |
| 1033 return result; | |
| 1034 } | |
| 1035 | |
| 1036 assert_heap_locked(); | |
| 1037 | |
| 1038 // Second attempt: go into the even slower path where we might | |
| 1039 // try to schedule a collection. | |
| 1040 result = attempt_allocation_slow(word_size); | |
| 1041 if (result != NULL) { | |
| 1042 assert_heap_not_locked(); | |
| 1043 return result; | |
| 1044 } | |
| 1045 } else { | |
| 1046 HeapWord* result = attempt_allocation_humongous(word_size, | |
| 1047 false /* at_safepoint */); | |
| 1048 if (result != NULL) { | |
| 1049 assert_heap_not_locked(); | |
| 1050 return result; | |
| 1051 } | |
| 342 | 1052 } |
| 1973 | 1053 |
| 1054 assert_heap_locked(); | |
| 342 | 1055 // Read the gc count while the heap lock is held. |
| 1056 gc_count_before = SharedHeap::heap()->total_collections(); | |
| 1973 | 1057 // We cannot be at a safepoint, so it is safe to unlock the Heap_lock |
| 342 | 1058 Heap_lock->unlock(); |
| 1059 } | |
| 1060 | |
| 1061 // Create the garbage collection operation... | |
| 1973 | 1062 VM_G1CollectForAllocation op(gc_count_before, word_size); |
| 342 | 1063 // ...and get the VM thread to execute it. |
| 1064 VMThread::execute(&op); | |
| 1973 | 1065 |
| 1066 assert_heap_not_locked(); | |
| 1067 if (op.prologue_succeeded() && op.pause_succeeded()) { | |
| 1068 // If the operation was successful we'll return the result even | |
| 1069 // if it is NULL. If the allocation attempt failed immediately | |
| 1070 // after a Full GC, it's unlikely we'll be able to allocate now. | |
| 1071 HeapWord* result = op.result(); | |
| 1072 if (result != NULL && !isHumongous(word_size)) { | |
| 1073 // Allocations that take place on VM operations do not do any | |
| 1074 // card dirtying and we have to do it here. We only have to do | |
| 1075 // this for non-humongous allocations, though. | |
| 1076 dirty_young_block(result, word_size); | |
| 1077 } | |
| 342 | 1078 return result; |
| 1973 | 1079 } else { |
| 1080 assert(op.result() == NULL, | |
| 1081 "the result should be NULL if the VM op did not succeed"); | |
| 342 | 1082 } |
| 1083 | |
| 1084 // Give a warning if we seem to be looping forever. | |
| 1085 if ((QueuedAllocationWarningCount > 0) && | |
| 1086 (try_count % QueuedAllocationWarningCount == 0)) { | |
| 1973 | 1087 warning("G1CollectedHeap::mem_allocate retries %d times", try_count); |
| 342 | 1088 } |
| 1089 } | |
| 1973 | 1090 |
| 1091 ShouldNotReachHere(); | |
| 342 | 1092 } |
| 1093 | |
| 1094 void G1CollectedHeap::abandon_cur_alloc_region() { | |
| 1095 if (_cur_alloc_region != NULL) { | |
| 1096 // We're finished with the _cur_alloc_region. | |
| 1097 if (_cur_alloc_region->is_empty()) { | |
| 1098 _free_regions++; | |
| 1099 free_region(_cur_alloc_region); | |
| 1100 } else { | |
|
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1101 // As we're builing (at least the young portion) of the collection |
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1102 // set incrementally we'll add the current allocation region to |
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1103 // the collection set here. |
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1104 if (_cur_alloc_region->is_young()) { |
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1105 g1_policy()->add_region_to_incremental_cset_lhs(_cur_alloc_region); |
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1106 } |
| 342 | 1107 _summary_bytes_used += _cur_alloc_region->used(); |
| 1108 } | |
| 1109 _cur_alloc_region = NULL; | |
| 1110 } | |
| 1111 } | |
| 1112 | |
| 636 | 1113 void G1CollectedHeap::abandon_gc_alloc_regions() { |
| 1114 // first, make sure that the GC alloc region list is empty (it should!) | |
| 1115 assert(_gc_alloc_region_list == NULL, "invariant"); | |
| 1116 release_gc_alloc_regions(true /* totally */); | |
| 1117 } | |
| 1118 | |
| 342 | 1119 class PostMCRemSetClearClosure: public HeapRegionClosure { |
| 1120 ModRefBarrierSet* _mr_bs; | |
| 1121 public: | |
| 1122 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 1123 bool doHeapRegion(HeapRegion* r) { | |
| 1124 r->reset_gc_time_stamp(); | |
| 1125 if (r->continuesHumongous()) | |
| 1126 return false; | |
| 1127 HeapRegionRemSet* hrrs = r->rem_set(); | |
| 1128 if (hrrs != NULL) hrrs->clear(); | |
| 1129 // You might think here that we could clear just the cards | |
| 1130 // corresponding to the used region. But no: if we leave a dirty card | |
| 1131 // in a region we might allocate into, then it would prevent that card | |
| 1132 // from being enqueued, and cause it to be missed. | |
| 1133 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
| 1134 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
| 1135 return false; | |
| 1136 } | |
| 1137 }; | |
| 1138 | |
| 1139 | |
| 1140 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
| 1141 ModRefBarrierSet* _mr_bs; | |
| 1142 public: | |
| 1143 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 1144 bool doHeapRegion(HeapRegion* r) { | |
| 1145 if (r->continuesHumongous()) return false; | |
| 1146 if (r->used_region().word_size() != 0) { | |
| 1147 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
| 1148 } | |
| 1149 return false; | |
| 1150 } | |
| 1151 }; | |
| 1152 | |
|
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1153 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
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1154 G1CollectedHeap* _g1h; |
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1155 UpdateRSOopClosure _cl; |
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1156 int _worker_i; |
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1157 public: |
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1158 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
| 1861 | 1159 _cl(g1->g1_rem_set(), worker_i), |
|
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1160 _worker_i(worker_i), |
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1161 _g1h(g1) |
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1162 { } |
|
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1163 |
|
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1164 bool doHeapRegion(HeapRegion* r) { |
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1165 if (!r->continuesHumongous()) { |
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1166 _cl.set_from(r); |
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1167 r->oop_iterate(&_cl); |
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1168 } |
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1169 return false; |
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1170 } |
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1171 }; |
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1172 |
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1173 class ParRebuildRSTask: public AbstractGangTask { |
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1174 G1CollectedHeap* _g1; |
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1175 public: |
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1176 ParRebuildRSTask(G1CollectedHeap* g1) |
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1177 : AbstractGangTask("ParRebuildRSTask"), |
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1178 _g1(g1) |
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1179 { } |
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1180 |
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1181 void work(int i) { |
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1182 RebuildRSOutOfRegionClosure rebuild_rs(_g1, i); |
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1183 _g1->heap_region_par_iterate_chunked(&rebuild_rs, i, |
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1184 HeapRegion::RebuildRSClaimValue); |
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1185 } |
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1186 }; |
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1187 |
| 1973 | 1188 bool G1CollectedHeap::do_collection(bool explicit_gc, |
|
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1189 bool clear_all_soft_refs, |
| 342 | 1190 size_t word_size) { |
|
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1191 if (GC_locker::check_active_before_gc()) { |
| 1973 | 1192 return false; |
|
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1193 } |
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1194 |
|
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1195 SvcGCMarker sgcm(SvcGCMarker::FULL); |
| 342 | 1196 ResourceMark rm; |
| 1197 | |
|
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1198 if (PrintHeapAtGC) { |
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1199 Universe::print_heap_before_gc(); |
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1200 } |
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1201 |
| 342 | 1202 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); |
| 1203 assert(Thread::current() == VMThread::vm_thread(), "should be in vm thread"); | |
| 1204 | |
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1205 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
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1206 collector_policy()->should_clear_all_soft_refs(); |
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1207 |
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1208 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
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1209 |
| 342 | 1210 { |
| 1211 IsGCActiveMark x; | |
| 1212 | |
| 1213 // Timing | |
|
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1214 bool system_gc = (gc_cause() == GCCause::_java_lang_system_gc); |
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1215 assert(!system_gc || explicit_gc, "invariant"); |
| 342 | 1216 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
| 1217 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
|
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1218 TraceTime t(system_gc ? "Full GC (System.gc())" : "Full GC", |
|
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1219 PrintGC, true, gclog_or_tty); |
| 342 | 1220 |
|
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1221 TraceMemoryManagerStats tms(true /* fullGC */); |
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1222 |
| 342 | 1223 double start = os::elapsedTime(); |
| 1224 g1_policy()->record_full_collection_start(); | |
| 1225 | |
| 1226 gc_prologue(true); | |
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1227 increment_total_collections(true /* full gc */); |
| 342 | 1228 |
| 1229 size_t g1h_prev_used = used(); | |
| 1230 assert(used() == recalculate_used(), "Should be equal"); | |
| 1231 | |
| 1232 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
| 1233 HandleMark hm; // Discard invalid handles created during verification | |
| 1234 prepare_for_verify(); | |
| 1235 gclog_or_tty->print(" VerifyBeforeGC:"); | |
| 1236 Universe::verify(true); | |
| 1237 } | |
| 1238 assert(regions_accounted_for(), "Region leakage!"); | |
| 1239 | |
| 1240 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
| 1241 | |
| 1242 // We want to discover references, but not process them yet. | |
| 1243 // This mode is disabled in | |
| 1244 // instanceRefKlass::process_discovered_references if the | |
| 1245 // generation does some collection work, or | |
| 1246 // instanceRefKlass::enqueue_discovered_references if the | |
| 1247 // generation returns without doing any work. | |
| 1248 ref_processor()->disable_discovery(); | |
| 1249 ref_processor()->abandon_partial_discovery(); | |
| 1250 ref_processor()->verify_no_references_recorded(); | |
| 1251 | |
| 1252 // Abandon current iterations of concurrent marking and concurrent | |
| 1253 // refinement, if any are in progress. | |
| 1254 concurrent_mark()->abort(); | |
| 1255 | |
| 1256 // Make sure we'll choose a new allocation region afterwards. | |
| 1257 abandon_cur_alloc_region(); | |
| 636 | 1258 abandon_gc_alloc_regions(); |
| 342 | 1259 assert(_cur_alloc_region == NULL, "Invariant."); |
| 1861 | 1260 g1_rem_set()->cleanupHRRS(); |
| 342 | 1261 tear_down_region_lists(); |
| 1262 set_used_regions_to_need_zero_fill(); | |
|
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1263 |
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1264 // We may have added regions to the current incremental collection |
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1265 // set between the last GC or pause and now. We need to clear the |
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1266 // incremental collection set and then start rebuilding it afresh |
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1267 // after this full GC. |
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1268 abandon_collection_set(g1_policy()->inc_cset_head()); |
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1269 g1_policy()->clear_incremental_cset(); |
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1270 g1_policy()->stop_incremental_cset_building(); |
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|
1271 |
| 342 | 1272 if (g1_policy()->in_young_gc_mode()) { |
| 1273 empty_young_list(); | |
| 1274 g1_policy()->set_full_young_gcs(true); | |
| 1275 } | |
| 1276 | |
|
1974
fd1d227ef1b9
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|
1277 // See the comment in G1CollectedHeap::ref_processing_init() about |
|
fd1d227ef1b9
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diff
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|
1278 // how reference processing currently works in G1. |
|
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|
1279 |
| 342 | 1280 // Temporarily make reference _discovery_ single threaded (non-MT). |
| 1281 ReferenceProcessorMTMutator rp_disc_ser(ref_processor(), false); | |
| 1282 | |
| 1283 // Temporarily make refs discovery atomic | |
| 1284 ReferenceProcessorAtomicMutator rp_disc_atomic(ref_processor(), true); | |
| 1285 | |
| 1286 // Temporarily clear _is_alive_non_header | |
| 1287 ReferenceProcessorIsAliveMutator rp_is_alive_null(ref_processor(), NULL); | |
| 1288 | |
| 1289 ref_processor()->enable_discovery(); | |
|
1387
0bfd3fb24150
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|
1290 ref_processor()->setup_policy(do_clear_all_soft_refs); |
| 342 | 1291 |
| 1292 // Do collection work | |
| 1293 { | |
| 1294 HandleMark hm; // Discard invalid handles created during gc | |
|
1387
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|
1295 G1MarkSweep::invoke_at_safepoint(ref_processor(), do_clear_all_soft_refs); |
| 342 | 1296 } |
| 1297 // Because freeing humongous regions may have added some unclean | |
| 1298 // regions, it is necessary to tear down again before rebuilding. | |
| 1299 tear_down_region_lists(); | |
| 1300 rebuild_region_lists(); | |
| 1301 | |
| 1302 _summary_bytes_used = recalculate_used(); | |
| 1303 | |
| 1304 ref_processor()->enqueue_discovered_references(); | |
| 1305 | |
| 1306 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
| 1307 | |
|
1089
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|
1308 MemoryService::track_memory_usage(); |
|
db0d5eba9d20
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|
1309 |
| 342 | 1310 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
| 1311 HandleMark hm; // Discard invalid handles created during verification | |
| 1312 gclog_or_tty->print(" VerifyAfterGC:"); | |
|
637
25e146966e7c
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diff
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|
1313 prepare_for_verify(); |
| 342 | 1314 Universe::verify(false); |
| 1315 } | |
| 1316 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); | |
| 1317 | |
| 1318 reset_gc_time_stamp(); | |
| 1319 // Since everything potentially moved, we will clear all remembered | |
|
626
87fa6e083d82
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1320 // sets, and clear all cards. Later we will rebuild remebered |
|
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|
1321 // sets. We will also reset the GC time stamps of the regions. |
| 342 | 1322 PostMCRemSetClearClosure rs_clear(mr_bs()); |
| 1323 heap_region_iterate(&rs_clear); | |
| 1324 | |
| 1325 // Resize the heap if necessary. | |
|
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|
1326 resize_if_necessary_after_full_collection(explicit_gc ? 0 : word_size); |
| 342 | 1327 |
| 1328 if (_cg1r->use_cache()) { | |
| 1329 _cg1r->clear_and_record_card_counts(); | |
| 1330 _cg1r->clear_hot_cache(); | |
| 1331 } | |
| 1332 | |
|
626
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|
1333 // Rebuild remembered sets of all regions. |
|
1833
8b10f48633dc
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parents:
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diff
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|
1334 |
|
8b10f48633dc
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diff
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|
1335 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
626
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6760309: G1: update remembered sets during Full GCs
apetrusenko
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|
1336 ParRebuildRSTask rebuild_rs_task(this); |
|
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1337 assert(check_heap_region_claim_values( |
|
87fa6e083d82
6760309: G1: update remembered sets during Full GCs
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|
1338 HeapRegion::InitialClaimValue), "sanity check"); |
|
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|
1339 set_par_threads(workers()->total_workers()); |
|
87fa6e083d82
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diff
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|
1340 workers()->run_task(&rebuild_rs_task); |
|
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diff
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|
1341 set_par_threads(0); |
|
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diff
changeset
|
1342 assert(check_heap_region_claim_values( |
|
87fa6e083d82
6760309: G1: update remembered sets during Full GCs
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|
1343 HeapRegion::RebuildRSClaimValue), "sanity check"); |
|
87fa6e083d82
6760309: G1: update remembered sets during Full GCs
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|
1344 reset_heap_region_claim_values(); |
|
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6760309: G1: update remembered sets during Full GCs
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|
1345 } else { |
|
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|
1346 RebuildRSOutOfRegionClosure rebuild_rs(this); |
|
87fa6e083d82
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|
1347 heap_region_iterate(&rebuild_rs); |
|
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|
1348 } |
|
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|
1349 |
| 342 | 1350 if (PrintGC) { |
| 1351 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); | |
| 1352 } | |
| 1353 | |
| 1354 if (true) { // FIXME | |
| 1355 // Ask the permanent generation to adjust size for full collections | |
| 1356 perm()->compute_new_size(); | |
| 1357 } | |
| 1358 | |
|
1394
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|
1359 // Start a new incremental collection set for the next pause |
|
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|
1360 assert(g1_policy()->collection_set() == NULL, "must be"); |
|
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|
1361 g1_policy()->start_incremental_cset_building(); |
|
1316cec51b4d
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|
1362 |
|
1316cec51b4d
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|
1363 // Clear the _cset_fast_test bitmap in anticipation of adding |
|
1316cec51b4d
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|
1364 // regions to the incremental collection set for the next |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
1365 // evacuation pause. |
|
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|
1366 clear_cset_fast_test(); |
|
1316cec51b4d
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|
1367 |
| 342 | 1368 double end = os::elapsedTime(); |
| 1369 g1_policy()->record_full_collection_end(); | |
| 1370 | |
|
546
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6690928: Use spinning in combination with yields for workstealing termination.
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|
1371 #ifdef TRACESPINNING |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
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|
1372 ParallelTaskTerminator::print_termination_counts(); |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
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diff
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|
1373 #endif |
|
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|
1374 |
| 342 | 1375 gc_epilogue(true); |
| 1376 | |
| 794 | 1377 // Discard all rset updates |
| 1378 JavaThread::dirty_card_queue_set().abandon_logs(); | |
|
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
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diff
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|
1379 assert(!G1DeferredRSUpdate |
|
4f360ec815ba
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iveresov
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diff
changeset
|
1380 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
| 342 | 1381 assert(regions_accounted_for(), "Region leakage!"); |
| 1382 } | |
| 1383 | |
| 1384 if (g1_policy()->in_young_gc_mode()) { | |
| 1385 _young_list->reset_sampled_info(); | |
|
1394
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diff
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|
1386 // At this point there should be no regions in the |
|
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diff
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|
1387 // entire heap tagged as young. |
|
1316cec51b4d
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|
1388 assert( check_young_list_empty(true /* check_heap */), |
| 342 | 1389 "young list should be empty at this point"); |
| 1390 } | |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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parents:
811
diff
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|
1391 |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
1392 // Update the number of full collections that have been completed. |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
1393 increment_full_collections_completed(false /* concurrent */); |
|
1656
4e5661ba9d98
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tonyp
parents:
1611
diff
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|
1394 |
|
838
0316eac49d5a
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parents:
811
diff
changeset
|
1395 if (PrintHeapAtGC) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
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|
1396 Universe::print_heap_after_gc(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
1397 } |
| 1973 | 1398 |
| 1399 return true; | |
| 342 | 1400 } |
| 1401 | |
| 1402 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
| 1973 | 1403 // do_collection() will return whether it succeeded in performing |
| 1404 // the GC. Currently, there is no facility on the | |
| 1405 // do_full_collection() API to notify the caller than the collection | |
| 1406 // did not succeed (e.g., because it was locked out by the GC | |
| 1407 // locker). So, right now, we'll ignore the return value. | |
| 1408 bool dummy = do_collection(true, /* explicit_gc */ | |
| 1409 clear_all_soft_refs, | |
| 1410 0 /* word_size */); | |
| 342 | 1411 } |
| 1412 | |
| 1413 // This code is mostly copied from TenuredGeneration. | |
| 1414 void | |
| 1415 G1CollectedHeap:: | |
| 1416 resize_if_necessary_after_full_collection(size_t word_size) { | |
| 1417 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
| 1418 | |
| 1419 // Include the current allocation, if any, and bytes that will be | |
| 1420 // pre-allocated to support collections, as "used". | |
| 1421 const size_t used_after_gc = used(); | |
| 1422 const size_t capacity_after_gc = capacity(); | |
| 1423 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
| 1424 | |
|
1717
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|
1425 // This is enforced in arguments.cpp. |
|
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6959014: G1: assert(minimum_desired_capacity <= maximum_desired_capacity) failed: sanity check
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changeset
|
1426 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, |
|
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|
1427 "otherwise the code below doesn't make sense"); |
|
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|
1428 |
| 342 | 1429 // We don't have floating point command-line arguments |
|
1717
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|
1430 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100.0; |
| 342 | 1431 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
|
1717
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diff
changeset
|
1432 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100.0; |
| 342 | 1433 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
| 1434 | |
|
1717
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|
1435 const size_t min_heap_size = collector_policy()->min_heap_byte_size(); |
|
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|
1436 const size_t max_heap_size = collector_policy()->max_heap_byte_size(); |
|
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|
1437 |
|
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|
1438 // We have to be careful here as these two calculations can overflow |
|
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|
1439 // 32-bit size_t's. |
|
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|
1440 double used_after_gc_d = (double) used_after_gc; |
|
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|
1441 double minimum_desired_capacity_d = used_after_gc_d / maximum_used_percentage; |
|
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|
1442 double maximum_desired_capacity_d = used_after_gc_d / minimum_used_percentage; |
|
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|
1443 |
|
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|
1444 // Let's make sure that they are both under the max heap size, which |
|
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|
1445 // by default will make them fit into a size_t. |
|
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|
1446 double desired_capacity_upper_bound = (double) max_heap_size; |
|
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|
1447 minimum_desired_capacity_d = MIN2(minimum_desired_capacity_d, |
|
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|
1448 desired_capacity_upper_bound); |
|
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|
1449 maximum_desired_capacity_d = MIN2(maximum_desired_capacity_d, |
|
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|
1450 desired_capacity_upper_bound); |
|
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|
1451 |
|
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|
1452 // We can now safely turn them into size_t's. |
|
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|
1453 size_t minimum_desired_capacity = (size_t) minimum_desired_capacity_d; |
|
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|
1454 size_t maximum_desired_capacity = (size_t) maximum_desired_capacity_d; |
|
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|
1455 |
|
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|
1456 // This assert only makes sense here, before we adjust them |
|
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|
1457 // with respect to the min and max heap size. |
|
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|
1458 assert(minimum_desired_capacity <= maximum_desired_capacity, |
|
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|
1459 err_msg("minimum_desired_capacity = "SIZE_FORMAT", " |
|
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|
1460 "maximum_desired_capacity = "SIZE_FORMAT, |
|
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|
1461 minimum_desired_capacity, maximum_desired_capacity)); |
|
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1462 |
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1463 // Should not be greater than the heap max size. No need to adjust |
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1464 // it with respect to the heap min size as it's a lower bound (i.e., |
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1465 // we'll try to make the capacity larger than it, not smaller). |
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1466 minimum_desired_capacity = MIN2(minimum_desired_capacity, max_heap_size); |
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1467 // Should not be less than the heap min size. No need to adjust it |
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1468 // with respect to the heap max size as it's an upper bound (i.e., |
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1469 // we'll try to make the capacity smaller than it, not greater). |
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1470 maximum_desired_capacity = MAX2(maximum_desired_capacity, min_heap_size); |
| 342 | 1471 |
| 1472 if (PrintGC && Verbose) { | |
|
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1473 const double free_percentage = |
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1474 (double) free_after_gc / (double) capacity_after_gc; |
| 342 | 1475 gclog_or_tty->print_cr("Computing new size after full GC "); |
| 1476 gclog_or_tty->print_cr(" " | |
| 1477 " minimum_free_percentage: %6.2f", | |
| 1478 minimum_free_percentage); | |
| 1479 gclog_or_tty->print_cr(" " | |
| 1480 " maximum_free_percentage: %6.2f", | |
| 1481 maximum_free_percentage); | |
| 1482 gclog_or_tty->print_cr(" " | |
| 1483 " capacity: %6.1fK" | |
| 1484 " minimum_desired_capacity: %6.1fK" | |
| 1485 " maximum_desired_capacity: %6.1fK", | |
|
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1486 (double) capacity_after_gc / (double) K, |
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1487 (double) minimum_desired_capacity / (double) K, |
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1488 (double) maximum_desired_capacity / (double) K); |
| 342 | 1489 gclog_or_tty->print_cr(" " |
|
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1490 " free_after_gc: %6.1fK" |
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1491 " used_after_gc: %6.1fK", |
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1492 (double) free_after_gc / (double) K, |
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1493 (double) used_after_gc / (double) K); |
| 342 | 1494 gclog_or_tty->print_cr(" " |
| 1495 " free_percentage: %6.2f", | |
| 1496 free_percentage); | |
| 1497 } | |
|
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1498 if (capacity_after_gc < minimum_desired_capacity) { |
| 342 | 1499 // Don't expand unless it's significant |
| 1500 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
| 1501 expand(expand_bytes); | |
| 1502 if (PrintGC && Verbose) { | |
|
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1503 gclog_or_tty->print_cr(" " |
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1504 " expanding:" |
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1505 " max_heap_size: %6.1fK" |
| 342 | 1506 " minimum_desired_capacity: %6.1fK" |
| 1507 " expand_bytes: %6.1fK", | |
|
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1508 (double) max_heap_size / (double) K, |
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1509 (double) minimum_desired_capacity / (double) K, |
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1510 (double) expand_bytes / (double) K); |
| 342 | 1511 } |
| 1512 | |
| 1513 // No expansion, now see if we want to shrink | |
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1514 } else if (capacity_after_gc > maximum_desired_capacity) { |
| 342 | 1515 // Capacity too large, compute shrinking size |
| 1516 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
| 1517 shrink(shrink_bytes); | |
| 1518 if (PrintGC && Verbose) { | |
| 1519 gclog_or_tty->print_cr(" " | |
| 1520 " shrinking:" | |
|
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1521 " min_heap_size: %6.1fK" |
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1522 " maximum_desired_capacity: %6.1fK" |
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1523 " shrink_bytes: %6.1fK", |
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1524 (double) min_heap_size / (double) K, |
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1525 (double) maximum_desired_capacity / (double) K, |
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1526 (double) shrink_bytes / (double) K); |
| 342 | 1527 } |
| 1528 } | |
| 1529 } | |
| 1530 | |
| 1531 | |
| 1532 HeapWord* | |
| 1973 | 1533 G1CollectedHeap::satisfy_failed_allocation(size_t word_size, |
| 1534 bool* succeeded) { | |
| 1535 assert(SafepointSynchronize::is_at_safepoint(), | |
| 1536 "satisfy_failed_allocation() should only be called at a safepoint"); | |
| 1537 assert(Thread::current()->is_VM_thread(), | |
| 1538 "satisfy_failed_allocation() should only be called by the VM thread"); | |
| 1539 | |
| 1540 *succeeded = true; | |
| 1541 // Let's attempt the allocation first. | |
| 1542 HeapWord* result = attempt_allocation_at_safepoint(word_size, | |
| 1543 false /* expect_null_cur_alloc_region */); | |
| 1544 if (result != NULL) { | |
| 1545 assert(*succeeded, "sanity"); | |
| 1546 return result; | |
| 1547 } | |
| 342 | 1548 |
| 1549 // In a G1 heap, we're supposed to keep allocation from failing by | |
| 1550 // incremental pauses. Therefore, at least for now, we'll favor | |
| 1551 // expansion over collection. (This might change in the future if we can | |
| 1552 // do something smarter than full collection to satisfy a failed alloc.) | |
| 1553 result = expand_and_allocate(word_size); | |
| 1554 if (result != NULL) { | |
| 1973 | 1555 assert(*succeeded, "sanity"); |
| 342 | 1556 return result; |
| 1557 } | |
| 1558 | |
| 1973 | 1559 // Expansion didn't work, we'll try to do a Full GC. |
| 1560 bool gc_succeeded = do_collection(false, /* explicit_gc */ | |
| 1561 false, /* clear_all_soft_refs */ | |
| 1562 word_size); | |
| 1563 if (!gc_succeeded) { | |
| 1564 *succeeded = false; | |
| 1565 return NULL; | |
| 1566 } | |
| 1567 | |
| 1568 // Retry the allocation | |
| 1569 result = attempt_allocation_at_safepoint(word_size, | |
| 1570 true /* expect_null_cur_alloc_region */); | |
| 342 | 1571 if (result != NULL) { |
| 1973 | 1572 assert(*succeeded, "sanity"); |
| 342 | 1573 return result; |
| 1574 } | |
| 1575 | |
| 1973 | 1576 // Then, try a Full GC that will collect all soft references. |
| 1577 gc_succeeded = do_collection(false, /* explicit_gc */ | |
| 1578 true, /* clear_all_soft_refs */ | |
| 1579 word_size); | |
| 1580 if (!gc_succeeded) { | |
| 1581 *succeeded = false; | |
| 1582 return NULL; | |
| 1583 } | |
| 1584 | |
| 1585 // Retry the allocation once more | |
| 1586 result = attempt_allocation_at_safepoint(word_size, | |
| 1587 true /* expect_null_cur_alloc_region */); | |
| 342 | 1588 if (result != NULL) { |
| 1973 | 1589 assert(*succeeded, "sanity"); |
| 342 | 1590 return result; |
| 1591 } | |
| 1592 | |
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1593 assert(!collector_policy()->should_clear_all_soft_refs(), |
| 1973 | 1594 "Flag should have been handled and cleared prior to this point"); |
|
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1595 |
| 342 | 1596 // What else? We might try synchronous finalization later. If the total |
| 1597 // space available is large enough for the allocation, then a more | |
| 1598 // complete compaction phase than we've tried so far might be | |
| 1599 // appropriate. | |
| 1973 | 1600 assert(*succeeded, "sanity"); |
| 342 | 1601 return NULL; |
| 1602 } | |
| 1603 | |
| 1604 // Attempting to expand the heap sufficiently | |
| 1605 // to support an allocation of the given "word_size". If | |
| 1606 // successful, perform the allocation and return the address of the | |
| 1607 // allocated block, or else "NULL". | |
| 1608 | |
| 1609 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
| 1973 | 1610 assert(SafepointSynchronize::is_at_safepoint(), |
| 1611 "expand_and_allocate() should only be called at a safepoint"); | |
| 1612 assert(Thread::current()->is_VM_thread(), | |
| 1613 "expand_and_allocate() should only be called by the VM thread"); | |
| 1614 | |
| 342 | 1615 size_t expand_bytes = word_size * HeapWordSize; |
| 1616 if (expand_bytes < MinHeapDeltaBytes) { | |
| 1617 expand_bytes = MinHeapDeltaBytes; | |
| 1618 } | |
| 1619 expand(expand_bytes); | |
| 1620 assert(regions_accounted_for(), "Region leakage!"); | |
| 1973 | 1621 |
| 1622 return attempt_allocation_at_safepoint(word_size, | |
|
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1623 false /* expect_null_cur_alloc_region */); |
| 342 | 1624 } |
| 1625 | |
| 1626 size_t G1CollectedHeap::free_region_if_totally_empty(HeapRegion* hr) { | |
| 1627 size_t pre_used = 0; | |
| 1628 size_t cleared_h_regions = 0; | |
| 1629 size_t freed_regions = 0; | |
| 1630 UncleanRegionList local_list; | |
| 1631 free_region_if_totally_empty_work(hr, pre_used, cleared_h_regions, | |
| 1632 freed_regions, &local_list); | |
| 1633 | |
| 1634 finish_free_region_work(pre_used, cleared_h_regions, freed_regions, | |
| 1635 &local_list); | |
| 1636 return pre_used; | |
| 1637 } | |
| 1638 | |
| 1639 void | |
| 1640 G1CollectedHeap::free_region_if_totally_empty_work(HeapRegion* hr, | |
| 1641 size_t& pre_used, | |
| 1642 size_t& cleared_h, | |
| 1643 size_t& freed_regions, | |
| 1644 UncleanRegionList* list, | |
| 1645 bool par) { | |
| 1646 assert(!hr->continuesHumongous(), "should have filtered these out"); | |
| 1647 size_t res = 0; | |
| 677 | 1648 if (hr->used() > 0 && hr->garbage_bytes() == hr->used() && |
| 1649 !hr->is_young()) { | |
| 1650 if (G1PolicyVerbose > 0) | |
| 1651 gclog_or_tty->print_cr("Freeing empty region "PTR_FORMAT "(" SIZE_FORMAT " bytes)" | |
| 1652 " during cleanup", hr, hr->used()); | |
| 1653 free_region_work(hr, pre_used, cleared_h, freed_regions, list, par); | |
| 342 | 1654 } |
| 1655 } | |
| 1656 | |
| 1657 // FIXME: both this and shrink could probably be more efficient by | |
| 1658 // doing one "VirtualSpace::expand_by" call rather than several. | |
| 1659 void G1CollectedHeap::expand(size_t expand_bytes) { | |
| 1660 size_t old_mem_size = _g1_storage.committed_size(); | |
| 1661 // We expand by a minimum of 1K. | |
| 1662 expand_bytes = MAX2(expand_bytes, (size_t)K); | |
| 1663 size_t aligned_expand_bytes = | |
| 1664 ReservedSpace::page_align_size_up(expand_bytes); | |
| 1665 aligned_expand_bytes = align_size_up(aligned_expand_bytes, | |
| 1666 HeapRegion::GrainBytes); | |
| 1667 expand_bytes = aligned_expand_bytes; | |
| 1668 while (expand_bytes > 0) { | |
| 1669 HeapWord* base = (HeapWord*)_g1_storage.high(); | |
| 1670 // Commit more storage. | |
| 1671 bool successful = _g1_storage.expand_by(HeapRegion::GrainBytes); | |
| 1672 if (!successful) { | |
| 1673 expand_bytes = 0; | |
| 1674 } else { | |
| 1675 expand_bytes -= HeapRegion::GrainBytes; | |
| 1676 // Expand the committed region. | |
| 1677 HeapWord* high = (HeapWord*) _g1_storage.high(); | |
| 1678 _g1_committed.set_end(high); | |
| 1679 // Create a new HeapRegion. | |
| 1680 MemRegion mr(base, high); | |
| 1681 bool is_zeroed = !_g1_max_committed.contains(base); | |
| 1682 HeapRegion* hr = new HeapRegion(_bot_shared, mr, is_zeroed); | |
| 1683 | |
| 1684 // Now update max_committed if necessary. | |
| 1685 _g1_max_committed.set_end(MAX2(_g1_max_committed.end(), high)); | |
| 1686 | |
| 1687 // Add it to the HeapRegionSeq. | |
| 1688 _hrs->insert(hr); | |
| 1689 // Set the zero-fill state, according to whether it's already | |
| 1690 // zeroed. | |
| 1691 { | |
| 1692 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 1693 if (is_zeroed) { | |
| 1694 hr->set_zero_fill_complete(); | |
| 1695 put_free_region_on_list_locked(hr); | |
| 1696 } else { | |
| 1697 hr->set_zero_fill_needed(); | |
| 1698 put_region_on_unclean_list_locked(hr); | |
| 1699 } | |
| 1700 } | |
| 1701 _free_regions++; | |
| 1702 // And we used up an expansion region to create it. | |
| 1703 _expansion_regions--; | |
| 1704 // Tell the cardtable about it. | |
| 1705 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
| 1706 // And the offset table as well. | |
| 1707 _bot_shared->resize(_g1_committed.word_size()); | |
| 1708 } | |
| 1709 } | |
| 1710 if (Verbose && PrintGC) { | |
| 1711 size_t new_mem_size = _g1_storage.committed_size(); | |
| 1712 gclog_or_tty->print_cr("Expanding garbage-first heap from %ldK by %ldK to %ldK", | |
| 1713 old_mem_size/K, aligned_expand_bytes/K, | |
| 1714 new_mem_size/K); | |
| 1715 } | |
| 1716 } | |
| 1717 | |
| 1718 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) | |
| 1719 { | |
| 1720 size_t old_mem_size = _g1_storage.committed_size(); | |
| 1721 size_t aligned_shrink_bytes = | |
| 1722 ReservedSpace::page_align_size_down(shrink_bytes); | |
| 1723 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
| 1724 HeapRegion::GrainBytes); | |
| 1725 size_t num_regions_deleted = 0; | |
| 1726 MemRegion mr = _hrs->shrink_by(aligned_shrink_bytes, num_regions_deleted); | |
| 1727 | |
| 1728 assert(mr.end() == (HeapWord*)_g1_storage.high(), "Bad shrink!"); | |
| 1729 if (mr.byte_size() > 0) | |
| 1730 _g1_storage.shrink_by(mr.byte_size()); | |
| 1731 assert(mr.start() == (HeapWord*)_g1_storage.high(), "Bad shrink!"); | |
| 1732 | |
| 1733 _g1_committed.set_end(mr.start()); | |
| 1734 _free_regions -= num_regions_deleted; | |
| 1735 _expansion_regions += num_regions_deleted; | |
| 1736 | |
| 1737 // Tell the cardtable about it. | |
| 1738 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
| 1739 | |
| 1740 // And the offset table as well. | |
| 1741 _bot_shared->resize(_g1_committed.word_size()); | |
| 1742 | |
| 1743 HeapRegionRemSet::shrink_heap(n_regions()); | |
| 1744 | |
| 1745 if (Verbose && PrintGC) { | |
| 1746 size_t new_mem_size = _g1_storage.committed_size(); | |
| 1747 gclog_or_tty->print_cr("Shrinking garbage-first heap from %ldK by %ldK to %ldK", | |
| 1748 old_mem_size/K, aligned_shrink_bytes/K, | |
| 1749 new_mem_size/K); | |
| 1750 } | |
| 1751 } | |
| 1752 | |
| 1753 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
| 636 | 1754 release_gc_alloc_regions(true /* totally */); |
| 342 | 1755 tear_down_region_lists(); // We will rebuild them in a moment. |
| 1756 shrink_helper(shrink_bytes); | |
| 1757 rebuild_region_lists(); | |
| 1758 } | |
| 1759 | |
| 1760 // Public methods. | |
| 1761 | |
| 1762 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
| 1763 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 1764 #endif // _MSC_VER | |
| 1765 | |
| 1766 | |
| 1767 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
| 1768 SharedHeap(policy_), | |
| 1769 _g1_policy(policy_), | |
| 1111 | 1770 _dirty_card_queue_set(false), |
| 1705 | 1771 _into_cset_dirty_card_queue_set(false), |
|
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1772 _is_alive_closure(this), |
| 342 | 1773 _ref_processor(NULL), |
| 1774 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), | |
| 1775 _bot_shared(NULL), | |
| 1776 _par_alloc_during_gc_lock(Mutex::leaf, "par alloc during GC lock"), | |
| 1777 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
| 1778 _evac_failure_scan_stack(NULL) , | |
| 1779 _mark_in_progress(false), | |
| 1780 _cg1r(NULL), _czft(NULL), _summary_bytes_used(0), | |
| 1781 _cur_alloc_region(NULL), | |
| 1782 _refine_cte_cl(NULL), | |
| 1783 _free_region_list(NULL), _free_region_list_size(0), | |
| 1784 _free_regions(0), | |
| 1785 _full_collection(false), | |
| 1786 _unclean_region_list(), | |
| 1787 _unclean_regions_coming(false), | |
| 1788 _young_list(new YoungList(this)), | |
| 1789 _gc_time_stamp(0), | |
| 526 | 1790 _surviving_young_words(NULL), |
|
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1791 _full_collections_completed(0), |
| 526 | 1792 _in_cset_fast_test(NULL), |
|
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1793 _in_cset_fast_test_base(NULL), |
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1794 _dirty_cards_region_list(NULL) { |
| 342 | 1795 _g1h = this; // To catch bugs. |
| 1796 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
| 1797 vm_exit_during_initialization("Failed necessary allocation."); | |
| 1798 } | |
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1799 |
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1800 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1801 |
| 342 | 1802 int n_queues = MAX2((int)ParallelGCThreads, 1); |
| 1803 _task_queues = new RefToScanQueueSet(n_queues); | |
| 1804 | |
| 1805 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
| 1806 assert(n_rem_sets > 0, "Invariant."); | |
| 1807 | |
| 1808 HeapRegionRemSetIterator** iter_arr = | |
| 1809 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
| 1810 for (int i = 0; i < n_queues; i++) { | |
| 1811 iter_arr[i] = new HeapRegionRemSetIterator(); | |
| 1812 } | |
| 1813 _rem_set_iterator = iter_arr; | |
| 1814 | |
| 1815 for (int i = 0; i < n_queues; i++) { | |
| 1816 RefToScanQueue* q = new RefToScanQueue(); | |
| 1817 q->initialize(); | |
| 1818 _task_queues->register_queue(i, q); | |
| 1819 } | |
| 1820 | |
| 1821 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 636 | 1822 _gc_alloc_regions[ap] = NULL; |
| 1823 _gc_alloc_region_counts[ap] = 0; | |
| 1824 _retained_gc_alloc_regions[ap] = NULL; | |
| 1825 // by default, we do not retain a GC alloc region for each ap; | |
| 1826 // we'll override this, when appropriate, below | |
| 1827 _retain_gc_alloc_region[ap] = false; | |
| 1828 } | |
| 1829 | |
| 1830 // We will try to remember the last half-full tenured region we | |
| 1831 // allocated to at the end of a collection so that we can re-use it | |
| 1832 // during the next collection. | |
| 1833 _retain_gc_alloc_region[GCAllocForTenured] = true; | |
| 1834 | |
| 342 | 1835 guarantee(_task_queues != NULL, "task_queues allocation failure."); |
| 1836 } | |
| 1837 | |
| 1838 jint G1CollectedHeap::initialize() { | |
| 1166 | 1839 CollectedHeap::pre_initialize(); |
| 342 | 1840 os::enable_vtime(); |
| 1841 | |
| 1842 // Necessary to satisfy locking discipline assertions. | |
| 1843 | |
| 1844 MutexLocker x(Heap_lock); | |
| 1845 | |
| 1846 // While there are no constraints in the GC code that HeapWordSize | |
| 1847 // be any particular value, there are multiple other areas in the | |
| 1848 // system which believe this to be true (e.g. oop->object_size in some | |
| 1849 // cases incorrectly returns the size in wordSize units rather than | |
| 1850 // HeapWordSize). | |
| 1851 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
| 1852 | |
| 1853 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
| 1854 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
| 1855 | |
| 1856 // Ensure that the sizes are properly aligned. | |
| 1857 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1858 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1859 | |
| 1860 _cg1r = new ConcurrentG1Refine(); | |
| 1861 | |
| 1862 // Reserve the maximum. | |
| 1863 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
| 1864 // Includes the perm-gen. | |
|
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1865 |
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1866 const size_t total_reserved = max_byte_size + pgs->max_size(); |
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1867 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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1868 |
| 342 | 1869 ReservedSpace heap_rs(max_byte_size + pgs->max_size(), |
| 1870 HeapRegion::GrainBytes, | |
|
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1871 false /*ism*/, addr); |
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1872 |
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1873 if (UseCompressedOops) { |
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1874 if (addr != NULL && !heap_rs.is_reserved()) { |
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1875 // Failed to reserve at specified address - the requested memory |
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1876 // region is taken already, for example, by 'java' launcher. |
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1877 // Try again to reserver heap higher. |
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1878 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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1879 ReservedSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
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1880 false /*ism*/, addr); |
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1881 if (addr != NULL && !heap_rs0.is_reserved()) { |
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1882 // Failed to reserve at specified address again - give up. |
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1883 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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1884 assert(addr == NULL, ""); |
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1885 ReservedSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
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1886 false /*ism*/, addr); |
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1887 heap_rs = heap_rs1; |
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1888 } else { |
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1889 heap_rs = heap_rs0; |
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1890 } |
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1891 } |
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1892 } |
| 342 | 1893 |
| 1894 if (!heap_rs.is_reserved()) { | |
| 1895 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
| 1896 return JNI_ENOMEM; | |
| 1897 } | |
| 1898 | |
| 1899 // It is important to do this in a way such that concurrent readers can't | |
| 1900 // temporarily think somethings in the heap. (I've actually seen this | |
| 1901 // happen in asserts: DLD.) | |
| 1902 _reserved.set_word_size(0); | |
| 1903 _reserved.set_start((HeapWord*)heap_rs.base()); | |
| 1904 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
| 1905 | |
| 1906 _expansion_regions = max_byte_size/HeapRegion::GrainBytes; | |
| 1907 | |
| 1908 _num_humongous_regions = 0; | |
| 1909 | |
| 1910 // Create the gen rem set (and barrier set) for the entire reserved region. | |
| 1911 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
| 1912 set_barrier_set(rem_set()->bs()); | |
| 1913 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
| 1914 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
| 1915 } else { | |
| 1916 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
| 1917 return JNI_ENOMEM; | |
| 1918 } | |
| 1919 | |
| 1920 // Also create a G1 rem set. | |
| 1861 | 1921 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { |
| 1922 _g1_rem_set = new G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
| 342 | 1923 } else { |
| 1861 | 1924 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); |
| 1925 return JNI_ENOMEM; | |
| 342 | 1926 } |
| 1927 | |
| 1928 // Carve out the G1 part of the heap. | |
| 1929 | |
| 1930 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
| 1931 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
| 1932 g1_rs.size()/HeapWordSize); | |
| 1933 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
| 1934 | |
| 1935 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
| 1936 | |
| 1937 _g1_storage.initialize(g1_rs, 0); | |
| 1938 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
| 1939 _g1_max_committed = _g1_committed; | |
| 393 | 1940 _hrs = new HeapRegionSeq(_expansion_regions); |
| 342 | 1941 guarantee(_hrs != NULL, "Couldn't allocate HeapRegionSeq"); |
| 1942 guarantee(_cur_alloc_region == NULL, "from constructor"); | |
| 1943 | |
|
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1944 // 6843694 - ensure that the maximum region index can fit |
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1945 // in the remembered set structures. |
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1946 const size_t max_region_idx = ((size_t)1 << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
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1947 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
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1948 |
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1949 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
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1950 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
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1951 guarantee((size_t) HeapRegion::CardsPerRegion < max_cards_per_region, |
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1952 "too many cards per region"); |
|
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1953 |
| 342 | 1954 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
| 1955 heap_word_size(init_byte_size)); | |
| 1956 | |
| 1957 _g1h = this; | |
| 1958 | |
|
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1959 _in_cset_fast_test_length = max_regions(); |
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1960 _in_cset_fast_test_base = NEW_C_HEAP_ARRAY(bool, _in_cset_fast_test_length); |
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1961 |
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1962 // We're biasing _in_cset_fast_test to avoid subtracting the |
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1963 // beginning of the heap every time we want to index; basically |
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1964 // it's the same with what we do with the card table. |
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1965 _in_cset_fast_test = _in_cset_fast_test_base - |
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1966 ((size_t) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
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1967 |
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1968 // Clear the _cset_fast_test bitmap in anticipation of adding |
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1969 // regions to the incremental collection set for the first |
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1970 // evacuation pause. |
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1971 clear_cset_fast_test(); |
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1972 |
| 342 | 1973 // Create the ConcurrentMark data structure and thread. |
| 1974 // (Must do this late, so that "max_regions" is defined.) | |
| 1975 _cm = new ConcurrentMark(heap_rs, (int) max_regions()); | |
| 1976 _cmThread = _cm->cmThread(); | |
| 1977 | |
| 1978 // ...and the concurrent zero-fill thread, if necessary. | |
| 1979 if (G1ConcZeroFill) { | |
| 1980 _czft = new ConcurrentZFThread(); | |
| 1981 } | |
| 1982 | |
| 1983 // Initialize the from_card cache structure of HeapRegionRemSet. | |
| 1984 HeapRegionRemSet::init_heap(max_regions()); | |
| 1985 | |
| 677 | 1986 // Now expand into the initial heap size. |
| 1987 expand(init_byte_size); | |
| 342 | 1988 |
| 1989 // Perform any initialization actions delegated to the policy. | |
| 1990 g1_policy()->init(); | |
| 1991 | |
| 1992 g1_policy()->note_start_of_mark_thread(); | |
| 1993 | |
| 1994 _refine_cte_cl = | |
| 1995 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
| 1996 g1_rem_set(), | |
| 1997 concurrent_g1_refine()); | |
| 1998 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 1999 | |
| 2000 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
| 2001 SATB_Q_FL_lock, | |
| 1111 | 2002 G1SATBProcessCompletedThreshold, |
| 342 | 2003 Shared_SATB_Q_lock); |
| 794 | 2004 |
| 2005 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
| 2006 DirtyCardQ_FL_lock, | |
| 1111 | 2007 concurrent_g1_refine()->yellow_zone(), |
| 2008 concurrent_g1_refine()->red_zone(), | |
| 794 | 2009 Shared_DirtyCardQ_lock); |
| 2010 | |
|
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2011 if (G1DeferredRSUpdate) { |
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2012 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
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2013 DirtyCardQ_FL_lock, |
| 1111 | 2014 -1, // never trigger processing |
| 2015 -1, // no limit on length | |
|
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2016 Shared_DirtyCardQ_lock, |
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2017 &JavaThread::dirty_card_queue_set()); |
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2018 } |
| 1705 | 2019 |
| 2020 // Initialize the card queue set used to hold cards containing | |
| 2021 // references into the collection set. | |
| 2022 _into_cset_dirty_card_queue_set.initialize(DirtyCardQ_CBL_mon, | |
| 2023 DirtyCardQ_FL_lock, | |
| 2024 -1, // never trigger processing | |
| 2025 -1, // no limit on length | |
| 2026 Shared_DirtyCardQ_lock, | |
| 2027 &JavaThread::dirty_card_queue_set()); | |
| 2028 | |
| 342 | 2029 // In case we're keeping closure specialization stats, initialize those |
| 2030 // counts and that mechanism. | |
| 2031 SpecializationStats::clear(); | |
| 2032 | |
| 2033 _gc_alloc_region_list = NULL; | |
| 2034 | |
| 2035 // Do later initialization work for concurrent refinement. | |
| 2036 _cg1r->init(); | |
| 2037 | |
| 2038 return JNI_OK; | |
| 2039 } | |
| 2040 | |
| 2041 void G1CollectedHeap::ref_processing_init() { | |
|
1974
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2042 // Reference processing in G1 currently works as follows: |
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2043 // |
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2044 // * There is only one reference processor instance that |
|
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2045 // 'spans' the entire heap. It is created by the code |
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2046 // below. |
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2047 // * Reference discovery is not enabled during an incremental |
|
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2048 // pause (see 6484982). |
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2049 // * Discoverered refs are not enqueued nor are they processed |
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|
2050 // during an incremental pause (see 6484982). |
|
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|
2051 // * Reference discovery is enabled at initial marking. |
|
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6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
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|
2052 // * Reference discovery is disabled and the discovered |
|
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|
2053 // references processed etc during remarking. |
|
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|
2054 // * Reference discovery is MT (see below). |
|
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|
2055 // * Reference discovery requires a barrier (see below). |
|
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|
2056 // * Reference processing is currently not MT (see 6608385). |
|
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|
2057 // * A full GC enables (non-MT) reference discovery and |
|
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|
2058 // processes any discovered references. |
|
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|
2059 |
| 342 | 2060 SharedHeap::ref_processing_init(); |
| 2061 MemRegion mr = reserved_region(); | |
| 2062 _ref_processor = ReferenceProcessor::create_ref_processor( | |
| 2063 mr, // span | |
| 2064 false, // Reference discovery is not atomic | |
| 2065 true, // mt_discovery | |
|
2037
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
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2030
diff
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|
2066 &_is_alive_closure, // is alive closure |
|
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
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diff
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|
2067 // for efficiency |
| 342 | 2068 ParallelGCThreads, |
| 2069 ParallelRefProcEnabled, | |
| 2070 true); // Setting next fields of discovered | |
| 2071 // lists requires a barrier. | |
| 2072 } | |
| 2073 | |
| 2074 size_t G1CollectedHeap::capacity() const { | |
| 2075 return _g1_committed.byte_size(); | |
| 2076 } | |
| 2077 | |
| 1705 | 2078 void G1CollectedHeap::iterate_dirty_card_closure(CardTableEntryClosure* cl, |
| 2079 DirtyCardQueue* into_cset_dcq, | |
| 2080 bool concurrent, | |
| 342 | 2081 int worker_i) { |
| 889 | 2082 // Clean cards in the hot card cache |
| 1705 | 2083 concurrent_g1_refine()->clean_up_cache(worker_i, g1_rem_set(), into_cset_dcq); |
| 889 | 2084 |
| 342 | 2085 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
| 2086 int n_completed_buffers = 0; | |
| 1705 | 2087 while (dcqs.apply_closure_to_completed_buffer(cl, worker_i, 0, true)) { |
| 342 | 2088 n_completed_buffers++; |
| 2089 } | |
| 2090 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
| 2091 (double) n_completed_buffers); | |
| 2092 dcqs.clear_n_completed_buffers(); | |
| 2093 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
| 2094 } | |
| 2095 | |
| 2096 | |
| 2097 // Computes the sum of the storage used by the various regions. | |
| 2098 | |
| 2099 size_t G1CollectedHeap::used() const { | |
|
862
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|
2100 assert(Heap_lock->owner() != NULL, |
|
36b5611220a7
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|
2101 "Should be owned on this thread's behalf."); |
| 342 | 2102 size_t result = _summary_bytes_used; |
|
845
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6700789: G1: Enable use of compressed oops with G1 heaps
ysr
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838
diff
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|
2103 // Read only once in case it is set to NULL concurrently |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
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838
diff
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|
2104 HeapRegion* hr = _cur_alloc_region; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
2105 if (hr != NULL) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
2106 result += hr->used(); |
| 342 | 2107 return result; |
| 2108 } | |
| 2109 | |
|
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
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845
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|
2110 size_t G1CollectedHeap::used_unlocked() const { |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
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845
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|
2111 size_t result = _summary_bytes_used; |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
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845
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|
2112 return result; |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
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845
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|
2113 } |
|
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
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845
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|
2114 |
| 342 | 2115 class SumUsedClosure: public HeapRegionClosure { |
| 2116 size_t _used; | |
| 2117 public: | |
| 2118 SumUsedClosure() : _used(0) {} | |
| 2119 bool doHeapRegion(HeapRegion* r) { | |
| 2120 if (!r->continuesHumongous()) { | |
| 2121 _used += r->used(); | |
| 2122 } | |
| 2123 return false; | |
| 2124 } | |
| 2125 size_t result() { return _used; } | |
| 2126 }; | |
| 2127 | |
| 2128 size_t G1CollectedHeap::recalculate_used() const { | |
| 2129 SumUsedClosure blk; | |
| 2130 _hrs->iterate(&blk); | |
| 2131 return blk.result(); | |
| 2132 } | |
| 2133 | |
| 2134 #ifndef PRODUCT | |
| 2135 class SumUsedRegionsClosure: public HeapRegionClosure { | |
| 2136 size_t _num; | |
| 2137 public: | |
| 677 | 2138 SumUsedRegionsClosure() : _num(0) {} |
| 342 | 2139 bool doHeapRegion(HeapRegion* r) { |
| 2140 if (r->continuesHumongous() || r->used() > 0 || r->is_gc_alloc_region()) { | |
| 2141 _num += 1; | |
| 2142 } | |
| 2143 return false; | |
| 2144 } | |
| 2145 size_t result() { return _num; } | |
| 2146 }; | |
| 2147 | |
| 2148 size_t G1CollectedHeap::recalculate_used_regions() const { | |
| 2149 SumUsedRegionsClosure blk; | |
| 2150 _hrs->iterate(&blk); | |
| 2151 return blk.result(); | |
| 2152 } | |
| 2153 #endif // PRODUCT | |
| 2154 | |
| 2155 size_t G1CollectedHeap::unsafe_max_alloc() { | |
| 2156 if (_free_regions > 0) return HeapRegion::GrainBytes; | |
| 2157 // otherwise, is there space in the current allocation region? | |
| 2158 | |
| 2159 // We need to store the current allocation region in a local variable | |
| 2160 // here. The problem is that this method doesn't take any locks and | |
| 2161 // there may be other threads which overwrite the current allocation | |
| 2162 // region field. attempt_allocation(), for example, sets it to NULL | |
| 2163 // and this can happen *after* the NULL check here but before the call | |
| 2164 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
| 2165 // to be a problem in the optimized build, since the two loads of the | |
| 2166 // current allocation region field are optimized away. | |
| 2167 HeapRegion* car = _cur_alloc_region; | |
| 2168 | |
| 2169 // FIXME: should iterate over all regions? | |
| 2170 if (car == NULL) { | |
| 2171 return 0; | |
| 2172 } | |
| 2173 return car->free(); | |
| 2174 } | |
| 2175 | |
|
1656
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|
2176 bool G1CollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { |
|
4e5661ba9d98
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|
2177 return |
|
4e5661ba9d98
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1611
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|
2178 ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
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|
2179 (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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|
2180 } |
|
4e5661ba9d98
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1611
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|
2181 |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
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1995
diff
changeset
|
2182 void G1CollectedHeap::increment_full_collections_completed(bool concurrent) { |
|
1656
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6944166: G1: explicit GCs are not always handled correctly
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1611
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|
2183 MonitorLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
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|
2184 |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
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1995
diff
changeset
|
2185 // We assume that if concurrent == true, then the caller is a |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
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1995
diff
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|
2186 // concurrent thread that was joined the Suspendible Thread |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
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1995
diff
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|
2187 // Set. If there's ever a cheap way to check this, we should add an |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
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1995
diff
changeset
|
2188 // assert here. |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
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1995
diff
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|
2189 |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
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|
2190 // We have already incremented _total_full_collections at the start |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
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|
2191 // of the GC, so total_full_collections() represents how many full |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
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|
2192 // collections have been started. |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
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|
2193 unsigned int full_collections_started = total_full_collections(); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
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|
2194 |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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parents:
1611
diff
changeset
|
2195 // Given that this method is called at the end of a Full GC or of a |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2196 // concurrent cycle, and those can be nested (i.e., a Full GC can |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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1611
diff
changeset
|
2197 // interrupt a concurrent cycle), the number of full collections |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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1611
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|
2198 // completed should be either one (in the case where there was no |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
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|
2199 // nesting) or two (when a Full GC interrupted a concurrent cycle) |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2200 // behind the number of full collections started. |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2201 |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2202 // This is the case for the inner caller, i.e. a Full GC. |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
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1995
diff
changeset
|
2203 assert(concurrent || |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2204 (full_collections_started == _full_collections_completed + 1) || |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2205 (full_collections_started == _full_collections_completed + 2), |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2206 err_msg("for inner caller (Full GC): full_collections_started = %u " |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2207 "is inconsistent with _full_collections_completed = %u", |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2208 full_collections_started, _full_collections_completed)); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2209 |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2210 // This is the case for the outer caller, i.e. the concurrent cycle. |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
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1995
diff
changeset
|
2211 assert(!concurrent || |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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parents:
1611
diff
changeset
|
2212 (full_collections_started == _full_collections_completed + 1), |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2213 err_msg("for outer caller (concurrent cycle): " |
|
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2214 "full_collections_started = %u " |
|
1656
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6944166: G1: explicit GCs are not always handled correctly
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changeset
|
2215 "is inconsistent with _full_collections_completed = %u", |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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diff
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|
2216 full_collections_started, _full_collections_completed)); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
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|
2217 |
|
4e5661ba9d98
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|
2218 _full_collections_completed += 1; |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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|
2219 |
|
1840
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
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1833
diff
changeset
|
2220 // We need to clear the "in_progress" flag in the CM thread before |
|
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
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1833
diff
changeset
|
2221 // we wake up any waiters (especially when ExplicitInvokesConcurrent |
|
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
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1833
diff
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|
2222 // is set) so that if a waiter requests another System.gc() it doesn't |
|
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
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1833
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|
2223 // incorrectly see that a marking cyle is still in progress. |
|
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
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|
2224 if (concurrent) { |
|
1840
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6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
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1833
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|
2225 _cmThread->clear_in_progress(); |
|
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
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1833
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|
2226 } |
|
4e0094bc41fa
6983311: G1: LoopTest hangs when run with -XX:+ExplicitInvokesConcurrent
johnc
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1833
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|
2227 |
|
1656
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6944166: G1: explicit GCs are not always handled correctly
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changeset
|
2228 // This notify_all() will ensure that a thread that called |
|
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6944166: G1: explicit GCs are not always handled correctly
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|
2229 // System.gc() with (with ExplicitGCInvokesConcurrent set or not) |
|
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6944166: G1: explicit GCs are not always handled correctly
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|
2230 // and it's waiting for a full GC to finish will be woken up. It is |
|
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6944166: G1: explicit GCs are not always handled correctly
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|
2231 // waiting in VM_G1IncCollectionPause::doit_epilogue(). |
|
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6944166: G1: explicit GCs are not always handled correctly
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|
2232 FullGCCount_lock->notify_all(); |
|
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6944166: G1: explicit GCs are not always handled correctly
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|
2233 } |
|
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|
2234 |
| 342 | 2235 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { |
| 2236 assert(Thread::current()->is_VM_thread(), "Precondition#1"); | |
| 2237 assert(Heap_lock->is_locked(), "Precondition#2"); | |
| 2238 GCCauseSetter gcs(this, cause); | |
| 2239 switch (cause) { | |
| 2240 case GCCause::_heap_inspection: | |
| 2241 case GCCause::_heap_dump: { | |
| 2242 HandleMark hm; | |
| 2243 do_full_collection(false); // don't clear all soft refs | |
| 2244 break; | |
| 2245 } | |
| 2246 default: // XXX FIX ME | |
| 2247 ShouldNotReachHere(); // Unexpected use of this function | |
| 2248 } | |
| 2249 } | |
| 2250 | |
|
1088
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
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|
2251 void G1CollectedHeap::collect(GCCause::Cause cause) { |
|
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
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|
2252 // The caller doesn't have the Heap_lock |
|
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
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1045
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|
2253 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); |
|
3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
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|
2254 |
|
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6944166: G1: explicit GCs are not always handled correctly
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|
2255 unsigned int gc_count_before; |
|
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2256 unsigned int full_gc_count_before; |
| 342 | 2257 { |
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2258 MutexLocker ml(Heap_lock); |
| 1973 | 2259 |
| 2260 // Don't want to do a GC until cleanup is completed. This | |
| 2261 // limitation will be removed in the near future when the | |
| 2262 // operation of the free region list is revamped as part of | |
| 2263 // CR 6977804. | |
| 2264 wait_for_cleanup_complete(); | |
| 2265 | |
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2266 // Read the GC count while holding the Heap_lock |
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2267 gc_count_before = SharedHeap::heap()->total_collections(); |
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2268 full_gc_count_before = SharedHeap::heap()->total_full_collections(); |
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2269 } |
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2270 |
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2271 if (should_do_concurrent_full_gc(cause)) { |
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2272 // Schedule an initial-mark evacuation pause that will start a |
| 1973 | 2273 // concurrent cycle. We're setting word_size to 0 which means that |
| 2274 // we are not requesting a post-GC allocation. | |
|
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2275 VM_G1IncCollectionPause op(gc_count_before, |
| 1973 | 2276 0, /* word_size */ |
| 2277 true, /* should_initiate_conc_mark */ | |
|
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2278 g1_policy()->max_pause_time_ms(), |
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2279 cause); |
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2280 VMThread::execute(&op); |
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2281 } else { |
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2282 if (cause == GCCause::_gc_locker |
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2283 DEBUG_ONLY(|| cause == GCCause::_scavenge_alot)) { |
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2284 |
| 1973 | 2285 // Schedule a standard evacuation pause. We're setting word_size |
| 2286 // to 0 which means that we are not requesting a post-GC allocation. | |
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2287 VM_G1IncCollectionPause op(gc_count_before, |
| 1973 | 2288 0, /* word_size */ |
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2289 false, /* should_initiate_conc_mark */ |
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2290 g1_policy()->max_pause_time_ms(), |
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2291 cause); |
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2292 VMThread::execute(&op); |
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2293 } else { |
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2294 // Schedule a Full GC. |
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2295 VM_G1CollectFull op(gc_count_before, full_gc_count_before, cause); |
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2296 VMThread::execute(&op); |
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2297 } |
| 342 | 2298 } |
| 2299 } | |
| 2300 | |
| 2301 bool G1CollectedHeap::is_in(const void* p) const { | |
| 2302 if (_g1_committed.contains(p)) { | |
| 2303 HeapRegion* hr = _hrs->addr_to_region(p); | |
| 2304 return hr->is_in(p); | |
| 2305 } else { | |
| 2306 return _perm_gen->as_gen()->is_in(p); | |
| 2307 } | |
| 2308 } | |
| 2309 | |
| 2310 // Iteration functions. | |
| 2311 | |
| 2312 // Iterates an OopClosure over all ref-containing fields of objects | |
| 2313 // within a HeapRegion. | |
| 2314 | |
| 2315 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
| 2316 MemRegion _mr; | |
| 2317 OopClosure* _cl; | |
| 2318 public: | |
| 2319 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
| 2320 : _mr(mr), _cl(cl) {} | |
| 2321 bool doHeapRegion(HeapRegion* r) { | |
| 2322 if (! r->continuesHumongous()) { | |
| 2323 r->oop_iterate(_cl); | |
| 2324 } | |
| 2325 return false; | |
| 2326 } | |
| 2327 }; | |
| 2328 | |
| 678 | 2329 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
| 342 | 2330 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
| 2331 _hrs->iterate(&blk); | |
| 678 | 2332 if (do_perm) { |
| 2333 perm_gen()->oop_iterate(cl); | |
| 2334 } | |
| 342 | 2335 } |
| 2336 | |
| 678 | 2337 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
| 342 | 2338 IterateOopClosureRegionClosure blk(mr, cl); |
| 2339 _hrs->iterate(&blk); | |
| 678 | 2340 if (do_perm) { |
| 2341 perm_gen()->oop_iterate(cl); | |
| 2342 } | |
| 342 | 2343 } |
| 2344 | |
| 2345 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
| 2346 | |
| 2347 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
| 2348 ObjectClosure* _cl; | |
| 2349 public: | |
| 2350 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
| 2351 bool doHeapRegion(HeapRegion* r) { | |
| 2352 if (! r->continuesHumongous()) { | |
| 2353 r->object_iterate(_cl); | |
| 2354 } | |
| 2355 return false; | |
| 2356 } | |
| 2357 }; | |
| 2358 | |
| 678 | 2359 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
| 342 | 2360 IterateObjectClosureRegionClosure blk(cl); |
| 2361 _hrs->iterate(&blk); | |
| 678 | 2362 if (do_perm) { |
| 2363 perm_gen()->object_iterate(cl); | |
| 2364 } | |
| 342 | 2365 } |
| 2366 | |
| 2367 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
| 2368 // FIXME: is this right? | |
| 2369 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
| 2370 } | |
| 2371 | |
| 2372 // Calls a SpaceClosure on a HeapRegion. | |
| 2373 | |
| 2374 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
| 2375 SpaceClosure* _cl; | |
| 2376 public: | |
| 2377 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
| 2378 bool doHeapRegion(HeapRegion* r) { | |
| 2379 _cl->do_space(r); | |
| 2380 return false; | |
| 2381 } | |
| 2382 }; | |
| 2383 | |
| 2384 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
| 2385 SpaceClosureRegionClosure blk(cl); | |
| 2386 _hrs->iterate(&blk); | |
| 2387 } | |
| 2388 | |
| 2389 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) { | |
| 2390 _hrs->iterate(cl); | |
| 2391 } | |
| 2392 | |
| 2393 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
| 2394 HeapRegionClosure* cl) { | |
| 2395 _hrs->iterate_from(r, cl); | |
| 2396 } | |
| 2397 | |
| 2398 void | |
| 2399 G1CollectedHeap::heap_region_iterate_from(int idx, HeapRegionClosure* cl) { | |
| 2400 _hrs->iterate_from(idx, cl); | |
| 2401 } | |
| 2402 | |
| 2403 HeapRegion* G1CollectedHeap::region_at(size_t idx) { return _hrs->at(idx); } | |
| 2404 | |
| 2405 void | |
| 2406 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
| 2407 int worker, | |
| 2408 jint claim_value) { | |
| 355 | 2409 const size_t regions = n_regions(); |
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2410 const size_t worker_num = (G1CollectedHeap::use_parallel_gc_threads() ? ParallelGCThreads : 1); |
| 355 | 2411 // try to spread out the starting points of the workers |
| 2412 const size_t start_index = regions / worker_num * (size_t) worker; | |
| 2413 | |
| 2414 // each worker will actually look at all regions | |
| 2415 for (size_t count = 0; count < regions; ++count) { | |
| 2416 const size_t index = (start_index + count) % regions; | |
| 2417 assert(0 <= index && index < regions, "sanity"); | |
| 2418 HeapRegion* r = region_at(index); | |
| 2419 // we'll ignore "continues humongous" regions (we'll process them | |
| 2420 // when we come across their corresponding "start humongous" | |
| 2421 // region) and regions already claimed | |
| 2422 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
| 2423 continue; | |
| 2424 } | |
| 2425 // OK, try to claim it | |
| 342 | 2426 if (r->claimHeapRegion(claim_value)) { |
| 355 | 2427 // success! |
| 2428 assert(!r->continuesHumongous(), "sanity"); | |
| 2429 if (r->startsHumongous()) { | |
| 2430 // If the region is "starts humongous" we'll iterate over its | |
| 2431 // "continues humongous" first; in fact we'll do them | |
| 2432 // first. The order is important. In on case, calling the | |
| 2433 // closure on the "starts humongous" region might de-allocate | |
| 2434 // and clear all its "continues humongous" regions and, as a | |
| 2435 // result, we might end up processing them twice. So, we'll do | |
| 2436 // them first (notice: most closures will ignore them anyway) and | |
| 2437 // then we'll do the "starts humongous" region. | |
| 2438 for (size_t ch_index = index + 1; ch_index < regions; ++ch_index) { | |
| 2439 HeapRegion* chr = region_at(ch_index); | |
| 2440 | |
| 2441 // if the region has already been claimed or it's not | |
| 2442 // "continues humongous" we're done | |
| 2443 if (chr->claim_value() == claim_value || | |
| 2444 !chr->continuesHumongous()) { | |
| 2445 break; | |
| 2446 } | |
| 2447 | |
| 2448 // Noone should have claimed it directly. We can given | |
| 2449 // that we claimed its "starts humongous" region. | |
| 2450 assert(chr->claim_value() != claim_value, "sanity"); | |
| 2451 assert(chr->humongous_start_region() == r, "sanity"); | |
| 2452 | |
| 2453 if (chr->claimHeapRegion(claim_value)) { | |
| 2454 // we should always be able to claim it; noone else should | |
| 2455 // be trying to claim this region | |
| 2456 | |
| 2457 bool res2 = cl->doHeapRegion(chr); | |
| 2458 assert(!res2, "Should not abort"); | |
| 2459 | |
| 2460 // Right now, this holds (i.e., no closure that actually | |
| 2461 // does something with "continues humongous" regions | |
| 2462 // clears them). We might have to weaken it in the future, | |
| 2463 // but let's leave these two asserts here for extra safety. | |
| 2464 assert(chr->continuesHumongous(), "should still be the case"); | |
| 2465 assert(chr->humongous_start_region() == r, "sanity"); | |
| 2466 } else { | |
| 2467 guarantee(false, "we should not reach here"); | |
| 2468 } | |
| 2469 } | |
| 2470 } | |
| 2471 | |
| 2472 assert(!r->continuesHumongous(), "sanity"); | |
| 2473 bool res = cl->doHeapRegion(r); | |
| 2474 assert(!res, "Should not abort"); | |
| 2475 } | |
| 2476 } | |
| 2477 } | |
| 2478 | |
| 390 | 2479 class ResetClaimValuesClosure: public HeapRegionClosure { |
| 2480 public: | |
| 2481 bool doHeapRegion(HeapRegion* r) { | |
| 2482 r->set_claim_value(HeapRegion::InitialClaimValue); | |
| 2483 return false; | |
| 2484 } | |
| 2485 }; | |
| 2486 | |
| 2487 void | |
| 2488 G1CollectedHeap::reset_heap_region_claim_values() { | |
| 2489 ResetClaimValuesClosure blk; | |
| 2490 heap_region_iterate(&blk); | |
| 2491 } | |
| 2492 | |
| 355 | 2493 #ifdef ASSERT |
| 2494 // This checks whether all regions in the heap have the correct claim | |
| 2495 // value. I also piggy-backed on this a check to ensure that the | |
| 2496 // humongous_start_region() information on "continues humongous" | |
| 2497 // regions is correct. | |
| 2498 | |
| 2499 class CheckClaimValuesClosure : public HeapRegionClosure { | |
| 2500 private: | |
| 2501 jint _claim_value; | |
| 2502 size_t _failures; | |
| 2503 HeapRegion* _sh_region; | |
| 2504 public: | |
| 2505 CheckClaimValuesClosure(jint claim_value) : | |
| 2506 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
| 2507 bool doHeapRegion(HeapRegion* r) { | |
| 2508 if (r->claim_value() != _claim_value) { | |
| 2509 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
| 2510 "claim value = %d, should be %d", | |
| 2511 r->bottom(), r->end(), r->claim_value(), | |
| 2512 _claim_value); | |
| 2513 ++_failures; | |
| 2514 } | |
| 2515 if (!r->isHumongous()) { | |
| 2516 _sh_region = NULL; | |
| 2517 } else if (r->startsHumongous()) { | |
| 2518 _sh_region = r; | |
| 2519 } else if (r->continuesHumongous()) { | |
| 2520 if (r->humongous_start_region() != _sh_region) { | |
| 2521 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
| 2522 "HS = "PTR_FORMAT", should be "PTR_FORMAT, | |
| 2523 r->bottom(), r->end(), | |
| 2524 r->humongous_start_region(), | |
| 2525 _sh_region); | |
| 2526 ++_failures; | |
| 342 | 2527 } |
| 2528 } | |
| 355 | 2529 return false; |
| 2530 } | |
| 2531 size_t failures() { | |
| 2532 return _failures; | |
| 2533 } | |
| 2534 }; | |
| 2535 | |
| 2536 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
| 2537 CheckClaimValuesClosure cl(claim_value); | |
| 2538 heap_region_iterate(&cl); | |
| 2539 return cl.failures() == 0; | |
| 2540 } | |
| 2541 #endif // ASSERT | |
| 342 | 2542 |
| 2543 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { | |
| 2544 HeapRegion* r = g1_policy()->collection_set(); | |
| 2545 while (r != NULL) { | |
| 2546 HeapRegion* next = r->next_in_collection_set(); | |
| 2547 if (cl->doHeapRegion(r)) { | |
| 2548 cl->incomplete(); | |
| 2549 return; | |
| 2550 } | |
| 2551 r = next; | |
| 2552 } | |
| 2553 } | |
| 2554 | |
| 2555 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
| 2556 HeapRegionClosure *cl) { | |
|
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2557 if (r == NULL) { |
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2558 // The CSet is empty so there's nothing to do. |
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2559 return; |
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2560 } |
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2561 |
| 342 | 2562 assert(r->in_collection_set(), |
| 2563 "Start region must be a member of the collection set."); | |
| 2564 HeapRegion* cur = r; | |
| 2565 while (cur != NULL) { | |
| 2566 HeapRegion* next = cur->next_in_collection_set(); | |
| 2567 if (cl->doHeapRegion(cur) && false) { | |
| 2568 cl->incomplete(); | |
| 2569 return; | |
| 2570 } | |
| 2571 cur = next; | |
| 2572 } | |
| 2573 cur = g1_policy()->collection_set(); | |
| 2574 while (cur != r) { | |
| 2575 HeapRegion* next = cur->next_in_collection_set(); | |
| 2576 if (cl->doHeapRegion(cur) && false) { | |
| 2577 cl->incomplete(); | |
| 2578 return; | |
| 2579 } | |
| 2580 cur = next; | |
| 2581 } | |
| 2582 } | |
| 2583 | |
| 2584 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
| 2585 return _hrs->length() > 0 ? _hrs->at(0) : NULL; | |
| 2586 } | |
| 2587 | |
| 2588 | |
| 2589 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
| 2590 Space* res = heap_region_containing(addr); | |
| 2591 if (res == NULL) | |
| 2592 res = perm_gen()->space_containing(addr); | |
| 2593 return res; | |
| 2594 } | |
| 2595 | |
| 2596 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
| 2597 Space* sp = space_containing(addr); | |
| 2598 if (sp != NULL) { | |
| 2599 return sp->block_start(addr); | |
| 2600 } | |
| 2601 return NULL; | |
| 2602 } | |
| 2603 | |
| 2604 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
| 2605 Space* sp = space_containing(addr); | |
| 2606 assert(sp != NULL, "block_size of address outside of heap"); | |
| 2607 return sp->block_size(addr); | |
| 2608 } | |
| 2609 | |
| 2610 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
| 2611 Space* sp = space_containing(addr); | |
| 2612 return sp->block_is_obj(addr); | |
| 2613 } | |
| 2614 | |
| 2615 bool G1CollectedHeap::supports_tlab_allocation() const { | |
| 2616 return true; | |
| 2617 } | |
| 2618 | |
| 2619 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
| 2620 return HeapRegion::GrainBytes; | |
| 2621 } | |
| 2622 | |
| 2623 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
| 2624 // Return the remaining space in the cur alloc region, but not less than | |
| 2625 // the min TLAB size. | |
|
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2626 |
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2627 // Also, this value can be at most the humongous object threshold, |
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2628 // since we can't allow tlabs to grow big enough to accomodate |
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2629 // humongous objects. |
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2630 |
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2631 // We need to store the cur alloc region locally, since it might change |
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2632 // between when we test for NULL and when we use it later. |
| 342 | 2633 ContiguousSpace* cur_alloc_space = _cur_alloc_region; |
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2634 size_t max_tlab_size = _humongous_object_threshold_in_words * wordSize; |
|
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2635 |
| 342 | 2636 if (cur_alloc_space == NULL) { |
|
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|
2637 return max_tlab_size; |
| 342 | 2638 } else { |
|
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2639 return MIN2(MAX2(cur_alloc_space->free(), (size_t)MinTLABSize), |
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|
2640 max_tlab_size); |
| 342 | 2641 } |
| 2642 } | |
| 2643 | |
| 2644 bool G1CollectedHeap::allocs_are_zero_filled() { | |
| 2645 return false; | |
| 2646 } | |
| 2647 | |
| 2648 size_t G1CollectedHeap::large_typearray_limit() { | |
| 2649 // FIXME | |
| 2650 return HeapRegion::GrainBytes/HeapWordSize; | |
| 2651 } | |
| 2652 | |
| 2653 size_t G1CollectedHeap::max_capacity() const { | |
|
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|
2654 return g1_reserved_obj_bytes(); |
| 342 | 2655 } |
| 2656 | |
| 2657 jlong G1CollectedHeap::millis_since_last_gc() { | |
| 2658 // assert(false, "NYI"); | |
| 2659 return 0; | |
| 2660 } | |
| 2661 | |
| 2662 | |
| 2663 void G1CollectedHeap::prepare_for_verify() { | |
| 2664 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
| 2665 ensure_parsability(false); | |
| 2666 } | |
| 2667 g1_rem_set()->prepare_for_verify(); | |
| 2668 } | |
| 2669 | |
| 2670 class VerifyLivenessOopClosure: public OopClosure { | |
| 2671 G1CollectedHeap* g1h; | |
| 2672 public: | |
| 2673 VerifyLivenessOopClosure(G1CollectedHeap* _g1h) { | |
| 2674 g1h = _g1h; | |
| 2675 } | |
|
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|
2676 void do_oop(narrowOop *p) { do_oop_work(p); } |
|
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|
2677 void do_oop( oop *p) { do_oop_work(p); } |
|
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2678 |
|
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|
2679 template <class T> void do_oop_work(T *p) { |
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2680 oop obj = oopDesc::load_decode_heap_oop(p); |
|
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2681 guarantee(obj == NULL || !g1h->is_obj_dead(obj), |
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|
2682 "Dead object referenced by a not dead object"); |
| 342 | 2683 } |
| 2684 }; | |
| 2685 | |
| 2686 class VerifyObjsInRegionClosure: public ObjectClosure { | |
| 811 | 2687 private: |
| 342 | 2688 G1CollectedHeap* _g1h; |
| 2689 size_t _live_bytes; | |
| 2690 HeapRegion *_hr; | |
| 811 | 2691 bool _use_prev_marking; |
| 342 | 2692 public: |
| 811 | 2693 // use_prev_marking == true -> use "prev" marking information, |
| 2694 // use_prev_marking == false -> use "next" marking information | |
| 2695 VerifyObjsInRegionClosure(HeapRegion *hr, bool use_prev_marking) | |
| 2696 : _live_bytes(0), _hr(hr), _use_prev_marking(use_prev_marking) { | |
| 342 | 2697 _g1h = G1CollectedHeap::heap(); |
| 2698 } | |
| 2699 void do_object(oop o) { | |
| 2700 VerifyLivenessOopClosure isLive(_g1h); | |
| 2701 assert(o != NULL, "Huh?"); | |
| 811 | 2702 if (!_g1h->is_obj_dead_cond(o, _use_prev_marking)) { |
| 342 | 2703 o->oop_iterate(&isLive); |
|
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|
2704 if (!_hr->obj_allocated_since_prev_marking(o)) { |
|
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|
2705 size_t obj_size = o->size(); // Make sure we don't overflow |
|
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2706 _live_bytes += (obj_size * HeapWordSize); |
|
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|
2707 } |
| 342 | 2708 } |
| 2709 } | |
| 2710 size_t live_bytes() { return _live_bytes; } | |
| 2711 }; | |
| 2712 | |
| 2713 class PrintObjsInRegionClosure : public ObjectClosure { | |
| 2714 HeapRegion *_hr; | |
| 2715 G1CollectedHeap *_g1; | |
| 2716 public: | |
| 2717 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
| 2718 _g1 = G1CollectedHeap::heap(); | |
| 2719 }; | |
| 2720 | |
| 2721 void do_object(oop o) { | |
| 2722 if (o != NULL) { | |
| 2723 HeapWord *start = (HeapWord *) o; | |
| 2724 size_t word_sz = o->size(); | |
| 2725 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
| 2726 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
| 2727 (void*) o, word_sz, | |
| 2728 _g1->isMarkedPrev(o), | |
| 2729 _g1->isMarkedNext(o), | |
| 2730 _hr->obj_allocated_since_prev_marking(o)); | |
| 2731 HeapWord *end = start + word_sz; | |
| 2732 HeapWord *cur; | |
| 2733 int *val; | |
| 2734 for (cur = start; cur < end; cur++) { | |
| 2735 val = (int *) cur; | |
| 2736 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
| 2737 } | |
| 2738 } | |
| 2739 } | |
| 2740 }; | |
| 2741 | |
| 2742 class VerifyRegionClosure: public HeapRegionClosure { | |
| 811 | 2743 private: |
| 342 | 2744 bool _allow_dirty; |
| 390 | 2745 bool _par; |
| 811 | 2746 bool _use_prev_marking; |
|
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|
2747 bool _failures; |
| 811 | 2748 public: |
| 2749 // use_prev_marking == true -> use "prev" marking information, | |
| 2750 // use_prev_marking == false -> use "next" marking information | |
| 2751 VerifyRegionClosure(bool allow_dirty, bool par, bool use_prev_marking) | |
|
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2752 : _allow_dirty(allow_dirty), |
|
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2753 _par(par), |
|
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2754 _use_prev_marking(use_prev_marking), |
|
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|
2755 _failures(false) {} |
|
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|
2756 |
|
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|
2757 bool failures() { |
|
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|
2758 return _failures; |
|
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|
2759 } |
|
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|
2760 |
| 342 | 2761 bool doHeapRegion(HeapRegion* r) { |
| 390 | 2762 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
| 2763 "Should be unclaimed at verify points."); | |
|
637
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|
2764 if (!r->continuesHumongous()) { |
|
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|
2765 bool failures = false; |
|
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|
2766 r->verify(_allow_dirty, _use_prev_marking, &failures); |
|
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|
2767 if (failures) { |
|
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|
2768 _failures = true; |
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|
2769 } else { |
|
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|
2770 VerifyObjsInRegionClosure not_dead_yet_cl(r, _use_prev_marking); |
|
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|
2771 r->object_iterate(¬_dead_yet_cl); |
|
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|
2772 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) { |
|
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|
2773 gclog_or_tty->print_cr("["PTR_FORMAT","PTR_FORMAT"] " |
|
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|
2774 "max_live_bytes "SIZE_FORMAT" " |
|
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|
2775 "< calculated "SIZE_FORMAT, |
|
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|
2776 r->bottom(), r->end(), |
|
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|
2777 r->max_live_bytes(), |
|
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|
2778 not_dead_yet_cl.live_bytes()); |
|
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|
2779 _failures = true; |
|
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|
2780 } |
|
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|
2781 } |
| 342 | 2782 } |
|
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|
2783 return false; // stop the region iteration if we hit a failure |
| 342 | 2784 } |
| 2785 }; | |
| 2786 | |
| 2787 class VerifyRootsClosure: public OopsInGenClosure { | |
| 2788 private: | |
| 2789 G1CollectedHeap* _g1h; | |
|
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|
2790 bool _use_prev_marking; |
| 342 | 2791 bool _failures; |
| 2792 public: | |
| 811 | 2793 // use_prev_marking == true -> use "prev" marking information, |
| 2794 // use_prev_marking == false -> use "next" marking information | |
| 2795 VerifyRootsClosure(bool use_prev_marking) : | |
|
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|
2796 _g1h(G1CollectedHeap::heap()), |
|
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|
2797 _use_prev_marking(use_prev_marking), |
|
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|
2798 _failures(false) { } |
| 342 | 2799 |
| 2800 bool failures() { return _failures; } | |
| 2801 | |
|
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|
2802 template <class T> void do_oop_nv(T* p) { |
|
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|
2803 T heap_oop = oopDesc::load_heap_oop(p); |
|
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|
2804 if (!oopDesc::is_null(heap_oop)) { |
|
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|
2805 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
| 811 | 2806 if (_g1h->is_obj_dead_cond(obj, _use_prev_marking)) { |
| 342 | 2807 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
|
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|
2808 "points to dead obj "PTR_FORMAT, p, (void*) obj); |
| 342 | 2809 obj->print_on(gclog_or_tty); |
| 2810 _failures = true; | |
| 2811 } | |
| 2812 } | |
| 2813 } | |
|
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|
2814 |
|
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|
2815 void do_oop(oop* p) { do_oop_nv(p); } |
|
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|
2816 void do_oop(narrowOop* p) { do_oop_nv(p); } |
| 342 | 2817 }; |
| 2818 | |
| 390 | 2819 // This is the task used for parallel heap verification. |
| 2820 | |
| 2821 class G1ParVerifyTask: public AbstractGangTask { | |
| 2822 private: | |
| 2823 G1CollectedHeap* _g1h; | |
| 2824 bool _allow_dirty; | |
| 811 | 2825 bool _use_prev_marking; |
|
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|
2826 bool _failures; |
| 390 | 2827 |
| 2828 public: | |
| 811 | 2829 // use_prev_marking == true -> use "prev" marking information, |
| 2830 // use_prev_marking == false -> use "next" marking information | |
| 2831 G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty, | |
| 2832 bool use_prev_marking) : | |
| 390 | 2833 AbstractGangTask("Parallel verify task"), |
|
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|
2834 _g1h(g1h), |
|
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|
2835 _allow_dirty(allow_dirty), |
|
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|
2836 _use_prev_marking(use_prev_marking), |
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|
2837 _failures(false) { } |
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|
2838 |
|
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|
2839 bool failures() { |
|
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|
2840 return _failures; |
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|
2841 } |
| 390 | 2842 |
| 2843 void work(int worker_i) { | |
|
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|
2844 HandleMark hm; |
| 811 | 2845 VerifyRegionClosure blk(_allow_dirty, true, _use_prev_marking); |
| 390 | 2846 _g1h->heap_region_par_iterate_chunked(&blk, worker_i, |
| 2847 HeapRegion::ParVerifyClaimValue); | |
|
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2848 if (blk.failures()) { |
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|
2849 _failures = true; |
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|
2850 } |
| 390 | 2851 } |
| 2852 }; | |
| 2853 | |
| 342 | 2854 void G1CollectedHeap::verify(bool allow_dirty, bool silent) { |
| 811 | 2855 verify(allow_dirty, silent, /* use_prev_marking */ true); |
| 2856 } | |
| 2857 | |
| 2858 void G1CollectedHeap::verify(bool allow_dirty, | |
| 2859 bool silent, | |
| 2860 bool use_prev_marking) { | |
| 342 | 2861 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
| 2862 if (!silent) { gclog_or_tty->print("roots "); } | |
| 811 | 2863 VerifyRootsClosure rootsCl(use_prev_marking); |
|
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|
2864 CodeBlobToOopClosure blobsCl(&rootsCl, /*do_marking=*/ false); |
|
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|
2865 process_strong_roots(true, // activate StrongRootsScope |
|
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|
2866 false, |
| 342 | 2867 SharedHeap::SO_AllClasses, |
| 2868 &rootsCl, | |
|
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|
2869 &blobsCl, |
| 342 | 2870 &rootsCl); |
|
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|
2871 bool failures = rootsCl.failures(); |
| 342 | 2872 rem_set()->invalidate(perm_gen()->used_region(), false); |
| 2873 if (!silent) { gclog_or_tty->print("heapRegions "); } | |
| 390 | 2874 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
| 2875 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 2876 "sanity check"); | |
| 2877 | |
| 811 | 2878 G1ParVerifyTask task(this, allow_dirty, use_prev_marking); |
| 390 | 2879 int n_workers = workers()->total_workers(); |
| 2880 set_par_threads(n_workers); | |
| 2881 workers()->run_task(&task); | |
| 2882 set_par_threads(0); | |
|
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|
2883 if (task.failures()) { |
|
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|
2884 failures = true; |
|
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2885 } |
| 390 | 2886 |
| 2887 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), | |
| 2888 "sanity check"); | |
| 2889 | |
| 2890 reset_heap_region_claim_values(); | |
| 2891 | |
| 2892 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 2893 "sanity check"); | |
| 2894 } else { | |
| 811 | 2895 VerifyRegionClosure blk(allow_dirty, false, use_prev_marking); |
| 390 | 2896 _hrs->iterate(&blk); |
|
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2897 if (blk.failures()) { |
|
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2898 failures = true; |
|
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2899 } |
| 390 | 2900 } |
| 342 | 2901 if (!silent) gclog_or_tty->print("remset "); |
| 2902 rem_set()->verify(); | |
|
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2903 |
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2904 if (failures) { |
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2905 gclog_or_tty->print_cr("Heap:"); |
|
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2906 print_on(gclog_or_tty, true /* extended */); |
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2907 gclog_or_tty->print_cr(""); |
|
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2908 #ifndef PRODUCT |
| 1044 | 2909 if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) { |
| 1388 | 2910 concurrent_mark()->print_reachable("at-verification-failure", |
| 2911 use_prev_marking, false /* all */); | |
|
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2912 } |
|
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2913 #endif |
|
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2914 gclog_or_tty->flush(); |
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2915 } |
|
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2916 guarantee(!failures, "there should not have been any failures"); |
| 342 | 2917 } else { |
| 2918 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
| 2919 } | |
| 2920 } | |
| 2921 | |
| 2922 class PrintRegionClosure: public HeapRegionClosure { | |
| 2923 outputStream* _st; | |
| 2924 public: | |
| 2925 PrintRegionClosure(outputStream* st) : _st(st) {} | |
| 2926 bool doHeapRegion(HeapRegion* r) { | |
| 2927 r->print_on(_st); | |
| 2928 return false; | |
| 2929 } | |
| 2930 }; | |
| 2931 | |
|
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2932 void G1CollectedHeap::print() const { print_on(tty); } |
| 342 | 2933 |
| 2934 void G1CollectedHeap::print_on(outputStream* st) const { | |
|
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2935 print_on(st, PrintHeapAtGCExtended); |
|
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2936 } |
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2937 |
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2938 void G1CollectedHeap::print_on(outputStream* st, bool extended) const { |
|
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2939 st->print(" %-20s", "garbage-first heap"); |
|
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2940 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
|
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2941 capacity()/K, used_unlocked()/K); |
|
838
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2942 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
|
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2943 _g1_storage.low_boundary(), |
|
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2944 _g1_storage.high(), |
|
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2945 _g1_storage.high_boundary()); |
|
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2946 st->cr(); |
|
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2947 st->print(" region size " SIZE_FORMAT "K, ", |
|
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2948 HeapRegion::GrainBytes/K); |
|
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2949 size_t young_regions = _young_list->length(); |
|
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2950 st->print(SIZE_FORMAT " young (" SIZE_FORMAT "K), ", |
|
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2951 young_regions, young_regions * HeapRegion::GrainBytes / K); |
|
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2952 size_t survivor_regions = g1_policy()->recorded_survivor_regions(); |
|
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2953 st->print(SIZE_FORMAT " survivors (" SIZE_FORMAT "K)", |
|
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2954 survivor_regions, survivor_regions * HeapRegion::GrainBytes / K); |
|
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|
2955 st->cr(); |
|
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|
2956 perm()->as_gen()->print_on(st); |
|
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2957 if (extended) { |
|
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2958 st->cr(); |
|
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2959 print_on_extended(st); |
|
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2960 } |
|
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2961 } |
|
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2962 |
|
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|
2963 void G1CollectedHeap::print_on_extended(outputStream* st) const { |
| 342 | 2964 PrintRegionClosure blk(st); |
| 2965 _hrs->iterate(&blk); | |
| 2966 } | |
| 2967 | |
| 2968 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { | |
|
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|
2969 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 1019 | 2970 workers()->print_worker_threads_on(st); |
| 2971 } | |
| 2972 | |
| 2973 _cmThread->print_on(st); | |
| 342 | 2974 st->cr(); |
| 1019 | 2975 |
| 2976 _cm->print_worker_threads_on(st); | |
| 2977 | |
| 2978 _cg1r->print_worker_threads_on(st); | |
| 2979 | |
| 342 | 2980 _czft->print_on(st); |
| 2981 st->cr(); | |
| 2982 } | |
| 2983 | |
| 2984 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
|
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|
2985 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 2986 workers()->threads_do(tc); |
| 2987 } | |
| 2988 tc->do_thread(_cmThread); | |
| 794 | 2989 _cg1r->threads_do(tc); |
| 342 | 2990 tc->do_thread(_czft); |
| 2991 } | |
| 2992 | |
| 2993 void G1CollectedHeap::print_tracing_info() const { | |
| 2994 // We'll overload this to mean "trace GC pause statistics." | |
| 2995 if (TraceGen0Time || TraceGen1Time) { | |
| 2996 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
| 2997 // to that. | |
| 2998 g1_policy()->print_tracing_info(); | |
| 2999 } | |
| 751 | 3000 if (G1SummarizeRSetStats) { |
| 342 | 3001 g1_rem_set()->print_summary_info(); |
| 3002 } | |
| 1282 | 3003 if (G1SummarizeConcMark) { |
| 342 | 3004 concurrent_mark()->print_summary_info(); |
| 3005 } | |
| 751 | 3006 if (G1SummarizeZFStats) { |
| 342 | 3007 ConcurrentZFThread::print_summary_info(); |
| 3008 } | |
| 3009 g1_policy()->print_yg_surv_rate_info(); | |
| 3010 | |
| 3011 SpecializationStats::print(); | |
| 3012 } | |
| 3013 | |
| 3014 | |
| 3015 int G1CollectedHeap::addr_to_arena_id(void* addr) const { | |
| 3016 HeapRegion* hr = heap_region_containing(addr); | |
| 3017 if (hr == NULL) { | |
| 3018 return 0; | |
| 3019 } else { | |
| 3020 return 1; | |
| 3021 } | |
| 3022 } | |
| 3023 | |
| 3024 G1CollectedHeap* G1CollectedHeap::heap() { | |
| 3025 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
| 3026 "not a garbage-first heap"); | |
| 3027 return _g1h; | |
| 3028 } | |
| 3029 | |
| 3030 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
|
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3031 // always_do_update_barrier = false; |
| 342 | 3032 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
| 3033 // Call allocation profiler | |
| 3034 AllocationProfiler::iterate_since_last_gc(); | |
| 3035 // Fill TLAB's and such | |
| 3036 ensure_parsability(true); | |
| 3037 } | |
| 3038 | |
| 3039 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
| 3040 // FIXME: what is this about? | |
| 3041 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
| 3042 // is set. | |
| 3043 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
| 3044 "derived pointer present")); | |
|
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3045 // always_do_update_barrier = true; |
| 342 | 3046 } |
| 3047 | |
| 1973 | 3048 HeapWord* G1CollectedHeap::do_collection_pause(size_t word_size, |
| 3049 unsigned int gc_count_before, | |
| 3050 bool* succeeded) { | |
| 3051 assert_heap_not_locked_and_not_at_safepoint(); | |
| 342 | 3052 g1_policy()->record_stop_world_start(); |
| 1973 | 3053 VM_G1IncCollectionPause op(gc_count_before, |
| 3054 word_size, | |
| 3055 false, /* should_initiate_conc_mark */ | |
| 3056 g1_policy()->max_pause_time_ms(), | |
| 3057 GCCause::_g1_inc_collection_pause); | |
| 3058 VMThread::execute(&op); | |
| 3059 | |
| 3060 HeapWord* result = op.result(); | |
| 3061 bool ret_succeeded = op.prologue_succeeded() && op.pause_succeeded(); | |
| 3062 assert(result == NULL || ret_succeeded, | |
| 3063 "the result should be NULL if the VM did not succeed"); | |
| 3064 *succeeded = ret_succeeded; | |
| 3065 | |
| 3066 assert_heap_not_locked(); | |
| 3067 return result; | |
| 342 | 3068 } |
| 3069 | |
| 3070 void | |
| 3071 G1CollectedHeap::doConcurrentMark() { | |
|
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3072 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
|
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|
3073 if (!_cmThread->in_progress()) { |
|
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|
3074 _cmThread->set_started(); |
|
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|
3075 CGC_lock->notify(); |
| 342 | 3076 } |
| 3077 } | |
| 3078 | |
| 3079 class VerifyMarkedObjsClosure: public ObjectClosure { | |
| 3080 G1CollectedHeap* _g1h; | |
| 3081 public: | |
| 3082 VerifyMarkedObjsClosure(G1CollectedHeap* g1h) : _g1h(g1h) {} | |
| 3083 void do_object(oop obj) { | |
| 3084 assert(obj->mark()->is_marked() ? !_g1h->is_obj_dead(obj) : true, | |
| 3085 "markandsweep mark should agree with concurrent deadness"); | |
| 3086 } | |
| 3087 }; | |
| 3088 | |
| 3089 void | |
| 3090 G1CollectedHeap::checkConcurrentMark() { | |
| 3091 VerifyMarkedObjsClosure verifycl(this); | |
| 3092 // MutexLockerEx x(getMarkBitMapLock(), | |
| 3093 // Mutex::_no_safepoint_check_flag); | |
| 678 | 3094 object_iterate(&verifycl, false); |
| 342 | 3095 } |
| 3096 | |
| 3097 void G1CollectedHeap::do_sync_mark() { | |
| 3098 _cm->checkpointRootsInitial(); | |
| 3099 _cm->markFromRoots(); | |
| 3100 _cm->checkpointRootsFinal(false); | |
| 3101 } | |
| 3102 | |
| 3103 // <NEW PREDICTION> | |
| 3104 | |
| 3105 double G1CollectedHeap::predict_region_elapsed_time_ms(HeapRegion *hr, | |
| 3106 bool young) { | |
| 3107 return _g1_policy->predict_region_elapsed_time_ms(hr, young); | |
| 3108 } | |
| 3109 | |
| 3110 void G1CollectedHeap::check_if_region_is_too_expensive(double | |
| 3111 predicted_time_ms) { | |
| 3112 _g1_policy->check_if_region_is_too_expensive(predicted_time_ms); | |
| 3113 } | |
| 3114 | |
| 3115 size_t G1CollectedHeap::pending_card_num() { | |
| 3116 size_t extra_cards = 0; | |
| 3117 JavaThread *curr = Threads::first(); | |
| 3118 while (curr != NULL) { | |
| 3119 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
| 3120 extra_cards += dcq.size(); | |
| 3121 curr = curr->next(); | |
| 3122 } | |
| 3123 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 3124 size_t buffer_size = dcqs.buffer_size(); | |
| 3125 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 3126 return buffer_size * buffer_num + extra_cards; | |
| 3127 } | |
| 3128 | |
| 3129 size_t G1CollectedHeap::max_pending_card_num() { | |
| 3130 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 3131 size_t buffer_size = dcqs.buffer_size(); | |
| 3132 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 3133 int thread_num = Threads::number_of_threads(); | |
| 3134 return (buffer_num + thread_num) * buffer_size; | |
| 3135 } | |
| 3136 | |
| 3137 size_t G1CollectedHeap::cards_scanned() { | |
| 1861 | 3138 return g1_rem_set()->cardsScanned(); |
| 342 | 3139 } |
| 3140 | |
| 3141 void | |
| 3142 G1CollectedHeap::setup_surviving_young_words() { | |
| 3143 guarantee( _surviving_young_words == NULL, "pre-condition" ); | |
| 3144 size_t array_length = g1_policy()->young_cset_length(); | |
| 3145 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, array_length); | |
| 3146 if (_surviving_young_words == NULL) { | |
| 3147 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
| 3148 "Not enough space for young surv words summary."); | |
| 3149 } | |
| 3150 memset(_surviving_young_words, 0, array_length * sizeof(size_t)); | |
|
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3151 #ifdef ASSERT |
| 342 | 3152 for (size_t i = 0; i < array_length; ++i) { |
|
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3153 assert( _surviving_young_words[i] == 0, "memset above" ); |
|
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|
3154 } |
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|
3155 #endif // !ASSERT |
| 342 | 3156 } |
| 3157 | |
| 3158 void | |
| 3159 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
| 3160 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 3161 size_t array_length = g1_policy()->young_cset_length(); | |
| 3162 for (size_t i = 0; i < array_length; ++i) | |
| 3163 _surviving_young_words[i] += surv_young_words[i]; | |
| 3164 } | |
| 3165 | |
| 3166 void | |
| 3167 G1CollectedHeap::cleanup_surviving_young_words() { | |
| 3168 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
| 3169 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
| 3170 _surviving_young_words = NULL; | |
| 3171 } | |
| 3172 | |
| 3173 // </NEW PREDICTION> | |
| 3174 | |
|
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3175 struct PrepareForRSScanningClosure : public HeapRegionClosure { |
|
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|
3176 bool doHeapRegion(HeapRegion *r) { |
|
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|
3177 r->rem_set()->set_iter_claimed(0); |
|
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|
3178 return false; |
|
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3179 } |
|
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3180 }; |
|
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1245
diff
changeset
|
3181 |
| 1709 | 3182 #if TASKQUEUE_STATS |
| 3183 void G1CollectedHeap::print_taskqueue_stats_hdr(outputStream* const st) { | |
| 3184 st->print_raw_cr("GC Task Stats"); | |
| 3185 st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); | |
| 3186 st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); | |
| 3187 } | |
| 3188 | |
| 3189 void G1CollectedHeap::print_taskqueue_stats(outputStream* const st) const { | |
| 3190 print_taskqueue_stats_hdr(st); | |
| 3191 | |
| 3192 TaskQueueStats totals; | |
|
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3193 const int n = workers() != NULL ? workers()->total_workers() : 1; |
| 1709 | 3194 for (int i = 0; i < n; ++i) { |
| 3195 st->print("%3d ", i); task_queue(i)->stats.print(st); st->cr(); | |
| 3196 totals += task_queue(i)->stats; | |
| 3197 } | |
| 3198 st->print_raw("tot "); totals.print(st); st->cr(); | |
| 3199 | |
| 3200 DEBUG_ONLY(totals.verify()); | |
| 3201 } | |
| 3202 | |
| 3203 void G1CollectedHeap::reset_taskqueue_stats() { | |
|
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
parents:
1719
diff
changeset
|
3204 const int n = workers() != NULL ? workers()->total_workers() : 1; |
| 1709 | 3205 for (int i = 0; i < n; ++i) { |
| 3206 task_queue(i)->stats.reset(); | |
| 3207 } | |
| 3208 } | |
| 3209 #endif // TASKQUEUE_STATS | |
| 3210 | |
| 1973 | 3211 bool |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3212 G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3213 if (GC_locker::check_active_before_gc()) { |
| 1973 | 3214 return false; |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3215 } |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3216 |
|
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
2039
diff
changeset
|
3217 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
|
2039
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
tonyp
parents:
2038
diff
changeset
|
3218 ResourceMark rm; |
|
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
tonyp
parents:
2038
diff
changeset
|
3219 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3220 if (PrintHeapAtGC) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3221 Universe::print_heap_before_gc(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3222 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3223 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3224 { |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3225 // This call will decide whether this pause is an initial-mark |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3226 // pause. If it is, during_initial_mark_pause() will return true |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3227 // for the duration of this pause. |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3228 g1_policy()->decide_on_conc_mark_initiation(); |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3229 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3230 char verbose_str[128]; |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3231 sprintf(verbose_str, "GC pause "); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3232 if (g1_policy()->in_young_gc_mode()) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3233 if (g1_policy()->full_young_gcs()) |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3234 strcat(verbose_str, "(young)"); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3235 else |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3236 strcat(verbose_str, "(partial)"); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3237 } |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3238 if (g1_policy()->during_initial_mark_pause()) { |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3239 strcat(verbose_str, " (initial-mark)"); |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3240 // 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
|
3241 // full collection counter. |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3242 increment_total_full_collections(); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
3243 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3244 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3245 // 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
|
3246 // 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
|
3247 // is messy if we do. |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3248 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3249 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3250 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
|
3251 |
|
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3252 TraceMemoryManagerStats tms(false /* fullGC */); |
|
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3253 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3254 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3255 assert(Thread::current() == VMThread::vm_thread(), "should be in vm thread"); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3256 guarantee(!is_gc_active(), "collection is not reentrant"); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3257 assert(regions_accounted_for(), "Region leakage!"); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3258 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3259 increment_gc_time_stamp(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3260 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3261 if (g1_policy()->in_young_gc_mode()) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3262 assert(check_young_list_well_formed(), |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3263 "young list should be well formed"); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3264 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3265 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3266 { // Call to jvmpi::post_class_unload_events must occur outside of active GC |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3267 IsGCActiveMark x; |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3268 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3269 gc_prologue(false); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3270 increment_total_collections(false /* full gc */); |
| 342 | 3271 |
| 3272 #if G1_REM_SET_LOGGING | |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3273 gclog_or_tty->print_cr("\nJust chose CS, heap:"); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3274 print(); |
| 342 | 3275 #endif |
| 3276 | |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3277 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3278 HandleMark hm; // Discard invalid handles created during verification |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3279 prepare_for_verify(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3280 gclog_or_tty->print(" VerifyBeforeGC:"); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3281 Universe::verify(false); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3282 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3283 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3284 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3285 |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
3286 // Please see comment in G1CollectedHeap::ref_processing_init() |
|
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
3287 // to see how reference processing currently works in G1. |
|
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
3288 // |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3289 // We want to turn off ref discovery, if necessary, and turn it back on |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3290 // on again later if we do. XXX Dubious: why is discovery disabled? |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3291 bool was_enabled = ref_processor()->discovery_enabled(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3292 if (was_enabled) ref_processor()->disable_discovery(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3293 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3294 // Forget the current alloc region (we might even choose it to be part |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3295 // of the collection set!). |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3296 abandon_cur_alloc_region(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3297 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3298 // The elapsed time induced by the start time below deliberately elides |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3299 // the possible verification above. |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3300 double start_time_sec = os::elapsedTime(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3301 size_t start_used_bytes = used(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3302 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3303 #if YOUNG_LIST_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3304 gclog_or_tty->print_cr("\nBefore recording pause start.\nYoung_list:"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3305 _young_list->print(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3306 g1_policy()->print_collection_set(g1_policy()->inc_cset_head(), gclog_or_tty); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3307 #endif // YOUNG_LIST_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3308 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3309 g1_policy()->record_collection_pause_start(start_time_sec, |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3310 start_used_bytes); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3311 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3312 #if YOUNG_LIST_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3313 gclog_or_tty->print_cr("\nAfter recording pause start.\nYoung_list:"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
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|
3314 _young_list->print(); |
|
1394
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|
3315 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3316 |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1313
diff
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|
3317 if (g1_policy()->during_initial_mark_pause()) { |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3318 concurrent_mark()->checkpointRootsInitialPre(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3319 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3320 save_marks(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3321 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3322 // We must do this before any possible evacuation that should propagate |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3323 // marks. |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3324 if (mark_in_progress()) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3325 double start_time_sec = os::elapsedTime(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3326 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3327 _cm->drainAllSATBBuffers(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3328 double finish_mark_ms = (os::elapsedTime() - start_time_sec) * 1000.0; |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3329 g1_policy()->record_satb_drain_time(finish_mark_ms); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3330 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3331 // Record the number of elements currently on the mark stack, so we |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3332 // only iterate over these. (Since evacuation may add to the mark |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3333 // stack, doing more exposes race conditions.) If no mark is in |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3334 // progress, this will be zero. |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3335 _cm->set_oops_do_bound(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3336 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3337 assert(regions_accounted_for(), "Region leakage."); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3338 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3339 if (mark_in_progress()) |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3340 concurrent_mark()->newCSet(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3341 |
|
1394
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|
3342 #if YOUNG_LIST_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
3343 gclog_or_tty->print_cr("\nBefore choosing collection set.\nYoung_list:"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
3344 _young_list->print(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
3345 g1_policy()->print_collection_set(g1_policy()->inc_cset_head(), gclog_or_tty); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
3346 #endif // YOUNG_LIST_VERBOSE |
|
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|
3347 |
| 1707 | 3348 g1_policy()->choose_collection_set(target_pause_time_ms); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3349 |
|
0316eac49d5a
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|
3350 // Nothing to do if we were unable to choose a collection set. |
| 342 | 3351 #if G1_REM_SET_LOGGING |
| 1707 | 3352 gclog_or_tty->print_cr("\nAfter pause, heap:"); |
| 3353 print(); | |
| 342 | 3354 #endif |
| 1707 | 3355 PrepareForRSScanningClosure prepare_for_rs_scan; |
| 3356 collection_set_iterate(&prepare_for_rs_scan); | |
| 3357 | |
| 3358 setup_surviving_young_words(); | |
| 3359 | |
| 3360 // Set up the gc allocation regions. | |
| 3361 get_gc_alloc_regions(); | |
| 3362 | |
| 3363 // Actually do the work... | |
| 3364 evacuate_collection_set(); | |
| 3365 | |
| 3366 free_collection_set(g1_policy()->collection_set()); | |
| 3367 g1_policy()->clear_collection_set(); | |
| 3368 | |
| 3369 cleanup_surviving_young_words(); | |
| 3370 | |
| 3371 // Start a new incremental collection set for the next pause. | |
| 3372 g1_policy()->start_incremental_cset_building(); | |
| 3373 | |
| 3374 // Clear the _cset_fast_test bitmap in anticipation of adding | |
| 3375 // regions to the incremental collection set for the next | |
| 3376 // evacuation pause. | |
| 3377 clear_cset_fast_test(); | |
| 3378 | |
| 3379 if (g1_policy()->in_young_gc_mode()) { | |
| 3380 _young_list->reset_sampled_info(); | |
| 3381 | |
| 3382 // Don't check the whole heap at this point as the | |
| 3383 // GC alloc regions from this pause have been tagged | |
| 3384 // as survivors and moved on to the survivor list. | |
| 3385 // Survivor regions will fail the !is_young() check. | |
| 3386 assert(check_young_list_empty(false /* check_heap */), | |
| 3387 "young list should be empty"); | |
|
1394
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|
3388 |
|
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changeset
|
3389 #if YOUNG_LIST_VERBOSE |
| 1707 | 3390 gclog_or_tty->print_cr("Before recording survivors.\nYoung List:"); |
| 3391 _young_list->print(); | |
|
1394
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|
3392 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3393 |
| 1707 | 3394 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
|
838
0316eac49d5a
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|
3395 _young_list->first_survivor_region(), |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3396 _young_list->last_survivor_region()); |
|
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|
3397 |
| 1707 | 3398 _young_list->reset_auxilary_lists(); |
| 342 | 3399 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3400 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3401 if (evacuation_failed()) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3402 _summary_bytes_used = recalculate_used(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3403 } else { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3404 // The "used" of the the collection set have already been subtracted |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
3405 // when they were freed. Add in the bytes evacuated. |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3406 _summary_bytes_used += g1_policy()->bytes_in_to_space(); |
|
0316eac49d5a
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|
3407 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3408 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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changeset
|
3409 if (g1_policy()->in_young_gc_mode() && |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1313
diff
changeset
|
3410 g1_policy()->during_initial_mark_pause()) { |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3411 concurrent_mark()->checkpointRootsInitialPost(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
3412 set_marking_started(); |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3413 // CAUTION: after the doConcurrentMark() call below, |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3414 // the concurrent marking thread(s) could be running |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3415 // concurrently with us. Make sure that anything after |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3416 // this point does not assume that we are the only GC thread |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3417 // running. Note: of course, the actual marking work will |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3418 // not start until the safepoint itself is released in |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
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838
diff
changeset
|
3419 // ConcurrentGCThread::safepoint_desynchronize(). |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
3420 doConcurrentMark(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3421 } |
| 342 | 3422 |
|
1394
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
3423 #if YOUNG_LIST_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
3424 gclog_or_tty->print_cr("\nEnd of the pause.\nYoung_list:"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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changeset
|
3425 _young_list->print(); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
3426 g1_policy()->print_collection_set(g1_policy()->inc_cset_head(), gclog_or_tty); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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|
3427 #endif // YOUNG_LIST_VERBOSE |
| 342 | 3428 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
changeset
|
3429 double end_time_sec = os::elapsedTime(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
3430 double pause_time_ms = (end_time_sec - start_time_sec) * MILLIUNITS; |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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changeset
|
3431 g1_policy()->record_pause_time_ms(pause_time_ms); |
| 1707 | 3432 g1_policy()->record_collection_pause_end(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
3433 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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changeset
|
3434 assert(regions_accounted_for(), "Region leakage."); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
3435 |
|
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
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1088
diff
changeset
|
3436 MemoryService::track_memory_usage(); |
|
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
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1088
diff
changeset
|
3437 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3438 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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changeset
|
3439 HandleMark hm; // Discard invalid handles created during verification |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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changeset
|
3440 gclog_or_tty->print(" VerifyAfterGC:"); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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changeset
|
3441 prepare_for_verify(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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changeset
|
3442 Universe::verify(false); |
| 342 | 3443 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
3444 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
3445 if (was_enabled) ref_processor()->enable_discovery(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
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|
3446 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
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changeset
|
3447 { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
changeset
|
3448 size_t expand_bytes = g1_policy()->expansion_amount(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
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|
3449 if (expand_bytes > 0) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
3450 size_t bytes_before = capacity(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
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changeset
|
3451 expand(expand_bytes); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
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|
3452 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
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changeset
|
3453 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
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|
3454 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
3455 if (mark_in_progress()) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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changeset
|
3456 concurrent_mark()->update_g1_committed(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
changeset
|
3457 } |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3458 |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3459 #ifdef TRACESPINNING |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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changeset
|
3460 ParallelTaskTerminator::print_termination_counts(); |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3461 #endif |
| 342 | 3462 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3463 gc_epilogue(false); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
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|
3464 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
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changeset
|
3465 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3466 assert(verify_region_lists(), "Bad region lists."); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3467 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3468 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3469 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
|
3470 print_tracing_info(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3471 vm_exit(-1); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3472 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3473 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3474 |
| 1709 | 3475 TASKQUEUE_STATS_ONLY(if (ParallelGCVerbose) print_taskqueue_stats()); |
| 3476 TASKQUEUE_STATS_ONLY(reset_taskqueue_stats()); | |
| 3477 | |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3478 if (PrintHeapAtGC) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3479 Universe::print_heap_after_gc(); |
| 342 | 3480 } |
|
884
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3481 if (G1SummarizeRSetStats && |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3482 (G1SummarizeRSetStatsPeriod > 0) && |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3483 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3484 g1_rem_set()->print_summary_info(); |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3485 } |
| 1973 | 3486 |
| 3487 return true; | |
| 342 | 3488 } |
| 3489 | |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3490 size_t G1CollectedHeap::desired_plab_sz(GCAllocPurpose purpose) |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3491 { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3492 size_t gclab_word_size; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3493 switch (purpose) { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3494 case GCAllocForSurvived: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3495 gclab_word_size = YoungPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3496 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3497 case GCAllocForTenured: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3498 gclab_word_size = OldPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3499 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3500 default: |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3501 assert(false, "unknown GCAllocPurpose"); |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3502 gclab_word_size = OldPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3503 break; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3504 } |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3505 return gclab_word_size; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3506 } |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3507 |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3508 |
| 342 | 3509 void G1CollectedHeap::set_gc_alloc_region(int purpose, HeapRegion* r) { |
| 3510 assert(purpose >= 0 && purpose < GCAllocPurposeCount, "invalid purpose"); | |
| 636 | 3511 // make sure we don't call set_gc_alloc_region() multiple times on |
| 3512 // the same region | |
| 3513 assert(r == NULL || !r->is_gc_alloc_region(), | |
| 3514 "shouldn't already be a GC alloc region"); | |
|
1360
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3515 assert(r == NULL || !r->isHumongous(), |
|
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3516 "humongous regions shouldn't be used as GC alloc regions"); |
|
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3517 |
| 342 | 3518 HeapWord* original_top = NULL; |
| 3519 if (r != NULL) | |
| 3520 original_top = r->top(); | |
| 3521 | |
| 3522 // We will want to record the used space in r as being there before gc. | |
| 3523 // One we install it as a GC alloc region it's eligible for allocation. | |
| 3524 // So record it now and use it later. | |
| 3525 size_t r_used = 0; | |
| 3526 if (r != NULL) { | |
| 3527 r_used = r->used(); | |
| 3528 | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
3529 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3530 // need to take the lock to guard against two threads calling |
| 3531 // get_gc_alloc_region concurrently (very unlikely but...) | |
| 3532 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 3533 r->save_marks(); | |
| 3534 } | |
| 3535 } | |
| 3536 HeapRegion* old_alloc_region = _gc_alloc_regions[purpose]; | |
| 3537 _gc_alloc_regions[purpose] = r; | |
| 3538 if (old_alloc_region != NULL) { | |
| 3539 // Replace aliases too. | |
| 3540 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 3541 if (_gc_alloc_regions[ap] == old_alloc_region) { | |
| 3542 _gc_alloc_regions[ap] = r; | |
| 3543 } | |
| 3544 } | |
| 3545 } | |
| 3546 if (r != NULL) { | |
| 3547 push_gc_alloc_region(r); | |
| 3548 if (mark_in_progress() && original_top != r->next_top_at_mark_start()) { | |
| 3549 // We are using a region as a GC alloc region after it has been used | |
| 3550 // as a mutator allocation region during the current marking cycle. | |
| 3551 // The mutator-allocated objects are currently implicitly marked, but | |
| 3552 // when we move hr->next_top_at_mark_start() forward at the the end | |
| 3553 // of the GC pause, they won't be. We therefore mark all objects in | |
| 3554 // the "gap". We do this object-by-object, since marking densely | |
| 3555 // does not currently work right with marking bitmap iteration. This | |
| 3556 // means we rely on TLAB filling at the start of pauses, and no | |
| 3557 // "resuscitation" of filled TLAB's. If we want to do this, we need | |
| 3558 // to fix the marking bitmap iteration. | |
| 3559 HeapWord* curhw = r->next_top_at_mark_start(); | |
| 3560 HeapWord* t = original_top; | |
| 3561 | |
| 3562 while (curhw < t) { | |
| 3563 oop cur = (oop)curhw; | |
| 3564 // We'll assume parallel for generality. This is rare code. | |
| 3565 concurrent_mark()->markAndGrayObjectIfNecessary(cur); // can't we just mark them? | |
| 3566 curhw = curhw + cur->size(); | |
| 3567 } | |
| 3568 assert(curhw == t, "Should have parsed correctly."); | |
| 3569 } | |
| 3570 if (G1PolicyVerbose > 1) { | |
| 3571 gclog_or_tty->print("New alloc region ["PTR_FORMAT", "PTR_FORMAT", " PTR_FORMAT") " | |
| 3572 "for survivors:", r->bottom(), original_top, r->end()); | |
| 3573 r->print(); | |
| 3574 } | |
| 3575 g1_policy()->record_before_bytes(r_used); | |
| 3576 } | |
| 3577 } | |
| 3578 | |
| 3579 void G1CollectedHeap::push_gc_alloc_region(HeapRegion* hr) { | |
| 3580 assert(Thread::current()->is_VM_thread() || | |
| 3581 par_alloc_during_gc_lock()->owned_by_self(), "Precondition"); | |
| 3582 assert(!hr->is_gc_alloc_region() && !hr->in_collection_set(), | |
| 3583 "Precondition."); | |
| 3584 hr->set_is_gc_alloc_region(true); | |
| 3585 hr->set_next_gc_alloc_region(_gc_alloc_region_list); | |
| 3586 _gc_alloc_region_list = hr; | |
| 3587 } | |
| 3588 | |
| 3589 #ifdef G1_DEBUG | |
| 3590 class FindGCAllocRegion: public HeapRegionClosure { | |
| 3591 public: | |
| 3592 bool doHeapRegion(HeapRegion* r) { | |
| 3593 if (r->is_gc_alloc_region()) { | |
| 3594 gclog_or_tty->print_cr("Region %d ["PTR_FORMAT"...] is still a gc_alloc_region.", | |
| 3595 r->hrs_index(), r->bottom()); | |
| 3596 } | |
| 3597 return false; | |
| 3598 } | |
| 3599 }; | |
| 3600 #endif // G1_DEBUG | |
| 3601 | |
| 3602 void G1CollectedHeap::forget_alloc_region_list() { | |
| 3603 assert(Thread::current()->is_VM_thread(), "Precondition"); | |
| 3604 while (_gc_alloc_region_list != NULL) { | |
| 3605 HeapRegion* r = _gc_alloc_region_list; | |
| 3606 assert(r->is_gc_alloc_region(), "Invariant."); | |
|
637
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3607 // We need HeapRegion::oops_on_card_seq_iterate_careful() to work on |
|
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3608 // newly allocated data in order to be able to apply deferred updates |
|
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3609 // before the GC is done for verification purposes (i.e to allow |
|
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3610 // G1HRRSFlushLogBuffersOnVerify). It's safe thing to do after the |
|
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3611 // collection. |
|
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3612 r->ContiguousSpace::set_saved_mark(); |
| 342 | 3613 _gc_alloc_region_list = r->next_gc_alloc_region(); |
| 3614 r->set_next_gc_alloc_region(NULL); | |
| 3615 r->set_is_gc_alloc_region(false); | |
| 545 | 3616 if (r->is_survivor()) { |
| 3617 if (r->is_empty()) { | |
| 3618 r->set_not_young(); | |
| 3619 } else { | |
| 3620 _young_list->add_survivor_region(r); | |
| 3621 } | |
| 3622 } | |
| 342 | 3623 if (r->is_empty()) { |
| 3624 ++_free_regions; | |
| 3625 } | |
| 3626 } | |
| 3627 #ifdef G1_DEBUG | |
| 3628 FindGCAllocRegion fa; | |
| 3629 heap_region_iterate(&fa); | |
| 3630 #endif // G1_DEBUG | |
| 3631 } | |
| 3632 | |
| 3633 | |
| 3634 bool G1CollectedHeap::check_gc_alloc_regions() { | |
| 3635 // TODO: allocation regions check | |
| 3636 return true; | |
| 3637 } | |
| 3638 | |
| 3639 void G1CollectedHeap::get_gc_alloc_regions() { | |
| 636 | 3640 // First, let's check that the GC alloc region list is empty (it should) |
| 3641 assert(_gc_alloc_region_list == NULL, "invariant"); | |
| 3642 | |
| 342 | 3643 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
| 636 | 3644 assert(_gc_alloc_regions[ap] == NULL, "invariant"); |
|
861
45d97a99715b
6862661: G1: _gc_alloc_region_counts is not updated properly after 6604422
apetrusenko
parents:
846
diff
changeset
|
3645 assert(_gc_alloc_region_counts[ap] == 0, "invariant"); |
| 636 | 3646 |
| 342 | 3647 // Create new GC alloc regions. |
| 636 | 3648 HeapRegion* alloc_region = _retained_gc_alloc_regions[ap]; |
| 3649 _retained_gc_alloc_regions[ap] = NULL; | |
| 3650 | |
| 3651 if (alloc_region != NULL) { | |
| 3652 assert(_retain_gc_alloc_region[ap], "only way to retain a GC region"); | |
| 3653 | |
| 3654 // let's make sure that the GC alloc region is not tagged as such | |
| 3655 // outside a GC operation | |
| 3656 assert(!alloc_region->is_gc_alloc_region(), "sanity"); | |
| 3657 | |
| 3658 if (alloc_region->in_collection_set() || | |
| 3659 alloc_region->top() == alloc_region->end() || | |
|
1360
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3660 alloc_region->top() == alloc_region->bottom() || |
|
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3661 alloc_region->isHumongous()) { |
|
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3662 // we will discard the current GC alloc region if |
|
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3663 // * it's in the collection set (it can happen!), |
|
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3664 // * it's already full (no point in using it), |
|
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3665 // * it's empty (this means that it was emptied during |
|
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3666 // a cleanup and it should be on the free list now), or |
|
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3667 // * it's humongous (this means that it was emptied |
|
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3668 // during a cleanup and was added to the free list, but |
|
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3669 // has been subseqently used to allocate a humongous |
|
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3670 // object that may be less than the region size). |
| 636 | 3671 |
| 3672 alloc_region = NULL; | |
| 3673 } | |
| 3674 } | |
| 3675 | |
| 3676 if (alloc_region == NULL) { | |
| 3677 // we will get a new GC alloc region | |
| 342 | 3678 alloc_region = newAllocRegionWithExpansion(ap, 0); |
|
861
45d97a99715b
6862661: G1: _gc_alloc_region_counts is not updated properly after 6604422
apetrusenko
parents:
846
diff
changeset
|
3679 } else { |
|
45d97a99715b
6862661: G1: _gc_alloc_region_counts is not updated properly after 6604422
apetrusenko
parents:
846
diff
changeset
|
3680 // the region was retained from the last collection |
|
45d97a99715b
6862661: G1: _gc_alloc_region_counts is not updated properly after 6604422
apetrusenko
parents:
846
diff
changeset
|
3681 ++_gc_alloc_region_counts[ap]; |
| 1388 | 3682 if (G1PrintHeapRegions) { |
| 3683 gclog_or_tty->print_cr("new alloc region %d:["PTR_FORMAT", "PTR_FORMAT"], " | |
| 3684 "top "PTR_FORMAT, | |
| 3685 alloc_region->hrs_index(), alloc_region->bottom(), alloc_region->end(), alloc_region->top()); | |
| 3686 } | |
| 342 | 3687 } |
| 636 | 3688 |
| 342 | 3689 if (alloc_region != NULL) { |
| 636 | 3690 assert(_gc_alloc_regions[ap] == NULL, "pre-condition"); |
| 342 | 3691 set_gc_alloc_region(ap, alloc_region); |
| 3692 } | |
| 636 | 3693 |
| 3694 assert(_gc_alloc_regions[ap] == NULL || | |
| 3695 _gc_alloc_regions[ap]->is_gc_alloc_region(), | |
| 3696 "the GC alloc region should be tagged as such"); | |
| 3697 assert(_gc_alloc_regions[ap] == NULL || | |
| 3698 _gc_alloc_regions[ap] == _gc_alloc_region_list, | |
| 3699 "the GC alloc region should be the same as the GC alloc list head"); | |
| 342 | 3700 } |
| 3701 // Set alternative regions for allocation purposes that have reached | |
| 636 | 3702 // their limit. |
| 342 | 3703 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
| 3704 GCAllocPurpose alt_purpose = g1_policy()->alternative_purpose(ap); | |
| 3705 if (_gc_alloc_regions[ap] == NULL && alt_purpose != ap) { | |
| 3706 _gc_alloc_regions[ap] = _gc_alloc_regions[alt_purpose]; | |
| 3707 } | |
| 3708 } | |
| 3709 assert(check_gc_alloc_regions(), "alloc regions messed up"); | |
| 3710 } | |
| 3711 | |
| 636 | 3712 void G1CollectedHeap::release_gc_alloc_regions(bool totally) { |
| 342 | 3713 // We keep a separate list of all regions that have been alloc regions in |
| 636 | 3714 // the current collection pause. Forget that now. This method will |
| 3715 // untag the GC alloc regions and tear down the GC alloc region | |
| 3716 // list. It's desirable that no regions are tagged as GC alloc | |
| 3717 // outside GCs. | |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
3718 |
| 342 | 3719 forget_alloc_region_list(); |
| 3720 | |
| 3721 // The current alloc regions contain objs that have survived | |
| 3722 // collection. Make them no longer GC alloc regions. | |
| 3723 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 3724 HeapRegion* r = _gc_alloc_regions[ap]; | |
| 636 | 3725 _retained_gc_alloc_regions[ap] = NULL; |
|
861
45d97a99715b
6862661: G1: _gc_alloc_region_counts is not updated properly after 6604422
apetrusenko
parents:
846
diff
changeset
|
3726 _gc_alloc_region_counts[ap] = 0; |
| 636 | 3727 |
| 3728 if (r != NULL) { | |
| 3729 // we retain nothing on _gc_alloc_regions between GCs | |
| 3730 set_gc_alloc_region(ap, NULL); | |
| 3731 | |
| 3732 if (r->is_empty()) { | |
| 3733 // we didn't actually allocate anything in it; let's just put | |
| 3734 // it on the free list | |
| 342 | 3735 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); |
| 3736 r->set_zero_fill_complete(); | |
| 3737 put_free_region_on_list_locked(r); | |
| 636 | 3738 } else if (_retain_gc_alloc_region[ap] && !totally) { |
| 3739 // retain it so that we can use it at the beginning of the next GC | |
| 3740 _retained_gc_alloc_regions[ap] = r; | |
| 342 | 3741 } |
| 3742 } | |
| 636 | 3743 } |
| 3744 } | |
| 3745 | |
| 3746 #ifndef PRODUCT | |
| 3747 // Useful for debugging | |
| 3748 | |
| 3749 void G1CollectedHeap::print_gc_alloc_regions() { | |
| 3750 gclog_or_tty->print_cr("GC alloc regions"); | |
| 3751 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 3752 HeapRegion* r = _gc_alloc_regions[ap]; | |
| 3753 if (r == NULL) { | |
| 3754 gclog_or_tty->print_cr(" %2d : "PTR_FORMAT, ap, NULL); | |
| 3755 } else { | |
| 3756 gclog_or_tty->print_cr(" %2d : "PTR_FORMAT" "SIZE_FORMAT, | |
| 3757 ap, r->bottom(), r->used()); | |
| 3758 } | |
| 3759 } | |
| 3760 } | |
| 3761 #endif // PRODUCT | |
| 342 | 3762 |
| 3763 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
| 3764 _drain_in_progress = false; | |
| 3765 set_evac_failure_closure(cl); | |
| 3766 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 3767 } | |
| 3768 | |
| 3769 void G1CollectedHeap::finalize_for_evac_failure() { | |
| 3770 assert(_evac_failure_scan_stack != NULL && | |
| 3771 _evac_failure_scan_stack->length() == 0, | |
| 3772 "Postcondition"); | |
| 3773 assert(!_drain_in_progress, "Postcondition"); | |
| 1045 | 3774 delete _evac_failure_scan_stack; |
| 342 | 3775 _evac_failure_scan_stack = NULL; |
| 3776 } | |
| 3777 | |
| 3778 | |
| 3779 | |
| 3780 // *** Sequential G1 Evacuation | |
| 3781 | |
| 3782 class G1IsAliveClosure: public BoolObjectClosure { | |
| 3783 G1CollectedHeap* _g1; | |
| 3784 public: | |
| 3785 G1IsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
| 3786 void do_object(oop p) { assert(false, "Do not call."); } | |
| 3787 bool do_object_b(oop p) { | |
| 3788 // It is reachable if it is outside the collection set, or is inside | |
| 3789 // and forwarded. | |
| 3790 | |
| 3791 #ifdef G1_DEBUG | |
| 3792 gclog_or_tty->print_cr("is alive "PTR_FORMAT" in CS %d forwarded %d overall %d", | |
| 3793 (void*) p, _g1->obj_in_cs(p), p->is_forwarded(), | |
| 3794 !_g1->obj_in_cs(p) || p->is_forwarded()); | |
| 3795 #endif // G1_DEBUG | |
| 3796 | |
| 3797 return !_g1->obj_in_cs(p) || p->is_forwarded(); | |
| 3798 } | |
| 3799 }; | |
| 3800 | |
| 3801 class G1KeepAliveClosure: public OopClosure { | |
| 3802 G1CollectedHeap* _g1; | |
| 3803 public: | |
| 3804 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
|
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3805 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
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3806 void do_oop( oop* p) { |
| 342 | 3807 oop obj = *p; |
| 3808 #ifdef G1_DEBUG | |
| 3809 if (PrintGC && Verbose) { | |
| 3810 gclog_or_tty->print_cr("keep alive *"PTR_FORMAT" = "PTR_FORMAT" "PTR_FORMAT, | |
| 3811 p, (void*) obj, (void*) *p); | |
| 3812 } | |
| 3813 #endif // G1_DEBUG | |
| 3814 | |
| 3815 if (_g1->obj_in_cs(obj)) { | |
| 3816 assert( obj->is_forwarded(), "invariant" ); | |
| 3817 *p = obj->forwardee(); | |
| 3818 #ifdef G1_DEBUG | |
| 3819 gclog_or_tty->print_cr(" in CSet: moved "PTR_FORMAT" -> "PTR_FORMAT, | |
| 3820 (void*) obj, (void*) *p); | |
| 3821 #endif // G1_DEBUG | |
| 3822 } | |
| 3823 } | |
| 3824 }; | |
| 3825 | |
|
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3826 class UpdateRSetDeferred : public OopsInHeapRegionClosure { |
|
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3827 private: |
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3828 G1CollectedHeap* _g1; |
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3829 DirtyCardQueue *_dcq; |
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3830 CardTableModRefBS* _ct_bs; |
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3831 |
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3832 public: |
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3833 UpdateRSetDeferred(G1CollectedHeap* g1, DirtyCardQueue* dcq) : |
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3834 _g1(g1), _ct_bs((CardTableModRefBS*)_g1->barrier_set()), _dcq(dcq) {} |
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3835 |
|
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3836 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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3837 virtual void do_oop( oop* p) { do_oop_work(p); } |
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3838 template <class T> void do_oop_work(T* p) { |
|
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3839 assert(_from->is_in_reserved(p), "paranoia"); |
|
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3840 if (!_from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && |
|
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3841 !_from->is_survivor()) { |
|
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3842 size_t card_index = _ct_bs->index_for(p); |
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3843 if (_ct_bs->mark_card_deferred(card_index)) { |
|
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3844 _dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index)); |
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3845 } |
|
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3846 } |
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3847 } |
|
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|
3848 }; |
|
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|
3849 |
| 342 | 3850 class RemoveSelfPointerClosure: public ObjectClosure { |
| 3851 private: | |
| 3852 G1CollectedHeap* _g1; | |
| 3853 ConcurrentMark* _cm; | |
| 3854 HeapRegion* _hr; | |
| 3855 size_t _prev_marked_bytes; | |
| 3856 size_t _next_marked_bytes; | |
|
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3857 OopsInHeapRegionClosure *_cl; |
| 342 | 3858 public: |
|
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3859 RemoveSelfPointerClosure(G1CollectedHeap* g1, OopsInHeapRegionClosure* cl) : |
|
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3860 _g1(g1), _cm(_g1->concurrent_mark()), _prev_marked_bytes(0), |
|
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3861 _next_marked_bytes(0), _cl(cl) {} |
| 342 | 3862 |
| 3863 size_t prev_marked_bytes() { return _prev_marked_bytes; } | |
| 3864 size_t next_marked_bytes() { return _next_marked_bytes; } | |
| 3865 | |
|
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3866 // The original idea here was to coalesce evacuated and dead objects. |
|
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3867 // However that caused complications with the block offset table (BOT). |
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3868 // In particular if there were two TLABs, one of them partially refined. |
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3869 // |----- TLAB_1--------|----TLAB_2-~~~(partially refined part)~~~| |
|
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3870 // The BOT entries of the unrefined part of TLAB_2 point to the start |
|
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3871 // of TLAB_2. If the last object of the TLAB_1 and the first object |
|
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3872 // of TLAB_2 are coalesced, then the cards of the unrefined part |
|
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3873 // would point into middle of the filler object. |
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3874 // |
|
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3875 // The current approach is to not coalesce and leave the BOT contents intact. |
|
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3876 void do_object(oop obj) { |
|
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3877 if (obj->is_forwarded() && obj->forwardee() == obj) { |
|
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3878 // The object failed to move. |
|
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3879 assert(!_g1->is_obj_dead(obj), "We should not be preserving dead objs."); |
|
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3880 _cm->markPrev(obj); |
|
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3881 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
|
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3882 _prev_marked_bytes += (obj->size() * HeapWordSize); |
|
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3883 if (_g1->mark_in_progress() && !_g1->is_obj_ill(obj)) { |
|
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3884 _cm->markAndGrayObjectIfNecessary(obj); |
|
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3885 } |
|
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3886 obj->set_mark(markOopDesc::prototype()); |
|
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3887 // While we were processing RSet buffers during the |
|
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3888 // collection, we actually didn't scan any cards on the |
|
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3889 // collection set, since we didn't want to update remebered |
|
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3890 // sets with entries that point into the collection set, given |
|
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3891 // that live objects fromthe collection set are about to move |
|
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3892 // and such entries will be stale very soon. This change also |
|
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|
3893 // dealt with a reliability issue which involved scanning a |
|
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3894 // card in the collection set and coming across an array that |
|
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|
3895 // was being chunked and looking malformed. The problem is |
|
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3896 // that, if evacuation fails, we might have remembered set |
|
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3897 // entries missing given that we skipped cards on the |
|
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3898 // collection set. So, we'll recreate such entries now. |
|
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|
3899 obj->oop_iterate(_cl); |
|
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3900 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
|
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3901 } else { |
|
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3902 // The object has been either evacuated or is dead. Fill it with a |
|
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3903 // dummy object. |
|
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|
3904 MemRegion mr((HeapWord*)obj, obj->size()); |
|
481
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|
3905 CollectedHeap::fill_with_object(mr); |
| 342 | 3906 _cm->clearRangeBothMaps(mr); |
| 3907 } | |
| 3908 } | |
| 3909 }; | |
| 3910 | |
| 3911 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
| 1705 | 3912 UpdateRSetImmediate immediate_update(_g1h->g1_rem_set()); |
|
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|
3913 DirtyCardQueue dcq(&_g1h->dirty_card_queue_set()); |
|
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|
3914 UpdateRSetDeferred deferred_update(_g1h, &dcq); |
|
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|
3915 OopsInHeapRegionClosure *cl; |
|
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|
3916 if (G1DeferredRSUpdate) { |
|
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|
3917 cl = &deferred_update; |
|
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|
3918 } else { |
|
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|
3919 cl = &immediate_update; |
|
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3920 } |
| 342 | 3921 HeapRegion* cur = g1_policy()->collection_set(); |
| 3922 while (cur != NULL) { | |
| 3923 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
| 3924 | |
|
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3925 RemoveSelfPointerClosure rspc(_g1h, cl); |
| 342 | 3926 if (cur->evacuation_failed()) { |
| 3927 assert(cur->in_collection_set(), "bad CS"); | |
|
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3928 cl->set_region(cur); |
| 342 | 3929 cur->object_iterate(&rspc); |
| 3930 | |
| 3931 // A number of manipulations to make the TAMS be the current top, | |
| 3932 // and the marked bytes be the ones observed in the iteration. | |
| 3933 if (_g1h->concurrent_mark()->at_least_one_mark_complete()) { | |
| 3934 // The comments below are the postconditions achieved by the | |
| 3935 // calls. Note especially the last such condition, which says that | |
| 3936 // the count of marked bytes has been properly restored. | |
| 3937 cur->note_start_of_marking(false); | |
| 3938 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
| 3939 cur->add_to_marked_bytes(rspc.prev_marked_bytes()); | |
| 3940 // _next_marked_bytes == prev_marked_bytes. | |
| 3941 cur->note_end_of_marking(); | |
| 3942 // _prev_top_at_mark_start == top(), | |
| 3943 // _prev_marked_bytes == prev_marked_bytes | |
| 3944 } | |
| 3945 // If there is no mark in progress, we modified the _next variables | |
| 3946 // above needlessly, but harmlessly. | |
| 3947 if (_g1h->mark_in_progress()) { | |
| 3948 cur->note_start_of_marking(false); | |
| 3949 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
| 3950 // _next_marked_bytes == next_marked_bytes. | |
| 3951 } | |
| 3952 | |
| 3953 // Now make sure the region has the right index in the sorted array. | |
| 3954 g1_policy()->note_change_in_marked_bytes(cur); | |
| 3955 } | |
| 3956 cur = cur->next_in_collection_set(); | |
| 3957 } | |
| 3958 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
| 3959 | |
| 3960 // Now restore saved marks, if any. | |
| 3961 if (_objs_with_preserved_marks != NULL) { | |
| 3962 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
| 3963 guarantee(_objs_with_preserved_marks->length() == | |
| 3964 _preserved_marks_of_objs->length(), "Both or none."); | |
| 3965 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
| 3966 oop obj = _objs_with_preserved_marks->at(i); | |
| 3967 markOop m = _preserved_marks_of_objs->at(i); | |
| 3968 obj->set_mark(m); | |
| 3969 } | |
| 3970 // Delete the preserved marks growable arrays (allocated on the C heap). | |
| 3971 delete _objs_with_preserved_marks; | |
| 3972 delete _preserved_marks_of_objs; | |
| 3973 _objs_with_preserved_marks = NULL; | |
| 3974 _preserved_marks_of_objs = NULL; | |
| 3975 } | |
| 3976 } | |
| 3977 | |
| 3978 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
| 3979 _evac_failure_scan_stack->push(obj); | |
| 3980 } | |
| 3981 | |
| 3982 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
| 3983 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
| 3984 | |
| 3985 while (_evac_failure_scan_stack->length() > 0) { | |
| 3986 oop obj = _evac_failure_scan_stack->pop(); | |
| 3987 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
| 3988 obj->oop_iterate_backwards(_evac_failure_closure); | |
| 3989 } | |
| 3990 } | |
| 3991 | |
| 3992 void G1CollectedHeap::handle_evacuation_failure(oop old) { | |
| 3993 markOop m = old->mark(); | |
| 3994 // forward to self | |
| 3995 assert(!old->is_forwarded(), "precondition"); | |
| 3996 | |
| 3997 old->forward_to(old); | |
| 3998 handle_evacuation_failure_common(old, m); | |
| 3999 } | |
| 4000 | |
| 4001 oop | |
| 4002 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
| 4003 oop old) { | |
| 4004 markOop m = old->mark(); | |
| 4005 oop forward_ptr = old->forward_to_atomic(old); | |
| 4006 if (forward_ptr == NULL) { | |
| 4007 // Forward-to-self succeeded. | |
| 4008 if (_evac_failure_closure != cl) { | |
| 4009 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
| 4010 assert(!_drain_in_progress, | |
| 4011 "Should only be true while someone holds the lock."); | |
| 4012 // Set the global evac-failure closure to the current thread's. | |
| 4013 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
| 4014 set_evac_failure_closure(cl); | |
| 4015 // Now do the common part. | |
| 4016 handle_evacuation_failure_common(old, m); | |
| 4017 // Reset to NULL. | |
| 4018 set_evac_failure_closure(NULL); | |
| 4019 } else { | |
| 4020 // The lock is already held, and this is recursive. | |
| 4021 assert(_drain_in_progress, "This should only be the recursive case."); | |
| 4022 handle_evacuation_failure_common(old, m); | |
| 4023 } | |
| 4024 return old; | |
| 4025 } else { | |
| 4026 // Someone else had a place to copy it. | |
| 4027 return forward_ptr; | |
| 4028 } | |
| 4029 } | |
| 4030 | |
| 4031 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
| 4032 set_evacuation_failed(true); | |
| 4033 | |
| 4034 preserve_mark_if_necessary(old, m); | |
| 4035 | |
| 4036 HeapRegion* r = heap_region_containing(old); | |
| 4037 if (!r->evacuation_failed()) { | |
| 4038 r->set_evacuation_failed(true); | |
| 1282 | 4039 if (G1PrintHeapRegions) { |
|
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|
4040 gclog_or_tty->print("overflow in heap region "PTR_FORMAT" " |
| 342 | 4041 "["PTR_FORMAT","PTR_FORMAT")\n", |
| 4042 r, r->bottom(), r->end()); | |
| 4043 } | |
| 4044 } | |
| 4045 | |
| 4046 push_on_evac_failure_scan_stack(old); | |
| 4047 | |
| 4048 if (!_drain_in_progress) { | |
| 4049 // prevent recursion in copy_to_survivor_space() | |
| 4050 _drain_in_progress = true; | |
| 4051 drain_evac_failure_scan_stack(); | |
| 4052 _drain_in_progress = false; | |
| 4053 } | |
| 4054 } | |
| 4055 | |
| 4056 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
|
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|
4057 assert(evacuation_failed(), "Oversaving!"); |
|
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4058 // We want to call the "for_promotion_failure" version only in the |
|
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4059 // case of a promotion failure. |
|
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|
4060 if (m->must_be_preserved_for_promotion_failure(obj)) { |
| 342 | 4061 if (_objs_with_preserved_marks == NULL) { |
| 4062 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
| 4063 _objs_with_preserved_marks = | |
| 4064 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 4065 _preserved_marks_of_objs = | |
| 4066 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
| 4067 } | |
| 4068 _objs_with_preserved_marks->push(obj); | |
| 4069 _preserved_marks_of_objs->push(m); | |
| 4070 } | |
| 4071 } | |
| 4072 | |
| 4073 // *** Parallel G1 Evacuation | |
| 4074 | |
| 4075 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
| 4076 size_t word_size) { | |
|
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|
4077 assert(!isHumongous(word_size), |
|
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|
4078 err_msg("we should not be seeing humongous allocation requests " |
|
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|
4079 "during GC, word_size = "SIZE_FORMAT, word_size)); |
|
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|
4080 |
| 342 | 4081 HeapRegion* alloc_region = _gc_alloc_regions[purpose]; |
| 4082 // let the caller handle alloc failure | |
| 4083 if (alloc_region == NULL) return NULL; | |
| 4084 | |
| 4085 HeapWord* block = alloc_region->par_allocate(word_size); | |
| 4086 if (block == NULL) { | |
| 4087 MutexLockerEx x(par_alloc_during_gc_lock(), | |
| 4088 Mutex::_no_safepoint_check_flag); | |
| 4089 block = allocate_during_gc_slow(purpose, alloc_region, true, word_size); | |
| 4090 } | |
| 4091 return block; | |
| 4092 } | |
| 4093 | |
| 545 | 4094 void G1CollectedHeap::retire_alloc_region(HeapRegion* alloc_region, |
| 4095 bool par) { | |
| 4096 // Another thread might have obtained alloc_region for the given | |
| 4097 // purpose, and might be attempting to allocate in it, and might | |
| 4098 // succeed. Therefore, we can't do the "finalization" stuff on the | |
| 4099 // region below until we're sure the last allocation has happened. | |
| 4100 // We ensure this by allocating the remaining space with a garbage | |
| 4101 // object. | |
| 4102 if (par) par_allocate_remaining_space(alloc_region); | |
| 4103 // Now we can do the post-GC stuff on the region. | |
| 4104 alloc_region->note_end_of_copying(); | |
| 4105 g1_policy()->record_after_bytes(alloc_region->used()); | |
| 4106 } | |
| 4107 | |
| 342 | 4108 HeapWord* |
| 4109 G1CollectedHeap::allocate_during_gc_slow(GCAllocPurpose purpose, | |
| 4110 HeapRegion* alloc_region, | |
| 4111 bool par, | |
| 4112 size_t word_size) { | |
|
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|
4113 assert(!isHumongous(word_size), |
|
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|
4114 err_msg("we should not be seeing humongous allocation requests " |
|
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|
4115 "during GC, word_size = "SIZE_FORMAT, word_size)); |
|
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|
4116 |
| 342 | 4117 HeapWord* block = NULL; |
| 4118 // In the parallel case, a previous thread to obtain the lock may have | |
| 4119 // already assigned a new gc_alloc_region. | |
| 4120 if (alloc_region != _gc_alloc_regions[purpose]) { | |
| 4121 assert(par, "But should only happen in parallel case."); | |
| 4122 alloc_region = _gc_alloc_regions[purpose]; | |
| 4123 if (alloc_region == NULL) return NULL; | |
| 4124 block = alloc_region->par_allocate(word_size); | |
| 4125 if (block != NULL) return block; | |
| 4126 // Otherwise, continue; this new region is empty, too. | |
| 4127 } | |
| 4128 assert(alloc_region != NULL, "We better have an allocation region"); | |
| 545 | 4129 retire_alloc_region(alloc_region, par); |
| 342 | 4130 |
| 4131 if (_gc_alloc_region_counts[purpose] >= g1_policy()->max_regions(purpose)) { | |
| 4132 // Cannot allocate more regions for the given purpose. | |
| 4133 GCAllocPurpose alt_purpose = g1_policy()->alternative_purpose(purpose); | |
| 4134 // Is there an alternative? | |
| 4135 if (purpose != alt_purpose) { | |
| 4136 HeapRegion* alt_region = _gc_alloc_regions[alt_purpose]; | |
| 4137 // Has not the alternative region been aliased? | |
| 545 | 4138 if (alloc_region != alt_region && alt_region != NULL) { |
| 342 | 4139 // Try to allocate in the alternative region. |
| 4140 if (par) { | |
| 4141 block = alt_region->par_allocate(word_size); | |
| 4142 } else { | |
| 4143 block = alt_region->allocate(word_size); | |
| 4144 } | |
| 4145 // Make an alias. | |
| 4146 _gc_alloc_regions[purpose] = _gc_alloc_regions[alt_purpose]; | |
| 545 | 4147 if (block != NULL) { |
| 4148 return block; | |
| 4149 } | |
| 4150 retire_alloc_region(alt_region, par); | |
| 342 | 4151 } |
| 4152 // Both the allocation region and the alternative one are full | |
| 4153 // and aliased, replace them with a new allocation region. | |
| 4154 purpose = alt_purpose; | |
| 4155 } else { | |
| 4156 set_gc_alloc_region(purpose, NULL); | |
| 4157 return NULL; | |
| 4158 } | |
| 4159 } | |
| 4160 | |
| 4161 // Now allocate a new region for allocation. | |
| 4162 alloc_region = newAllocRegionWithExpansion(purpose, word_size, false /*zero_filled*/); | |
| 4163 | |
| 4164 // let the caller handle alloc failure | |
| 4165 if (alloc_region != NULL) { | |
| 4166 | |
| 4167 assert(check_gc_alloc_regions(), "alloc regions messed up"); | |
| 4168 assert(alloc_region->saved_mark_at_top(), | |
| 4169 "Mark should have been saved already."); | |
| 4170 // We used to assert that the region was zero-filled here, but no | |
| 4171 // longer. | |
| 4172 | |
| 4173 // This must be done last: once it's installed, other regions may | |
| 4174 // allocate in it (without holding the lock.) | |
| 4175 set_gc_alloc_region(purpose, alloc_region); | |
| 4176 | |
| 4177 if (par) { | |
| 4178 block = alloc_region->par_allocate(word_size); | |
| 4179 } else { | |
| 4180 block = alloc_region->allocate(word_size); | |
| 4181 } | |
| 4182 // Caller handles alloc failure. | |
| 4183 } else { | |
| 4184 // This sets other apis using the same old alloc region to NULL, also. | |
| 4185 set_gc_alloc_region(purpose, NULL); | |
| 4186 } | |
| 4187 return block; // May be NULL. | |
| 4188 } | |
| 4189 | |
| 4190 void G1CollectedHeap::par_allocate_remaining_space(HeapRegion* r) { | |
| 4191 HeapWord* block = NULL; | |
| 4192 size_t free_words; | |
| 4193 do { | |
| 4194 free_words = r->free()/HeapWordSize; | |
| 4195 // If there's too little space, no one can allocate, so we're done. | |
|
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|
4196 if (free_words < CollectedHeap::min_fill_size()) return; |
| 342 | 4197 // Otherwise, try to claim it. |
| 4198 block = r->par_allocate(free_words); | |
| 4199 } while (block == NULL); | |
|
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|
4200 fill_with_object(block, free_words); |
| 342 | 4201 } |
| 4202 | |
| 4203 #ifndef PRODUCT | |
| 4204 bool GCLabBitMapClosure::do_bit(size_t offset) { | |
| 4205 HeapWord* addr = _bitmap->offsetToHeapWord(offset); | |
| 4206 guarantee(_cm->isMarked(oop(addr)), "it should be!"); | |
| 4207 return true; | |
| 4208 } | |
| 4209 #endif // PRODUCT | |
| 4210 | |
|
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4211 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num) |
|
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4212 : _g1h(g1h), |
|
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|
4213 _refs(g1h->task_queue(queue_num)), |
|
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|
4214 _dcq(&g1h->dirty_card_queue_set()), |
|
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|
4215 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
|
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|
4216 _g1_rem(g1h->g1_rem_set()), |
|
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|
4217 _hash_seed(17), _queue_num(queue_num), |
|
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|
4218 _term_attempts(0), |
|
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4219 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)), |
|
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|
4220 _tenured_alloc_buffer(g1h->desired_plab_sz(GCAllocForTenured)), |
|
845
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4221 _age_table(false), |
|
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|
4222 _strong_roots_time(0), _term_time(0), |
|
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|
4223 _alloc_buffer_waste(0), _undo_waste(0) |
|
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|
4224 { |
|
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|
4225 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
|
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|
4226 // we "sacrifice" entry 0 to keep track of surviving bytes for |
|
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|
4227 // non-young regions (where the age is -1) |
|
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|
4228 // We also add a few elements at the beginning and at the end in |
|
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|
4229 // an attempt to eliminate cache contention |
|
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|
4230 size_t real_length = 1 + _g1h->g1_policy()->young_cset_length(); |
|
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|
4231 size_t array_length = PADDING_ELEM_NUM + |
|
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|
4232 real_length + |
|
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|
4233 PADDING_ELEM_NUM; |
|
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|
4234 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length); |
|
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|
4235 if (_surviving_young_words_base == NULL) |
|
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|
4236 vm_exit_out_of_memory(array_length * sizeof(size_t), |
|
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|
4237 "Not enough space for young surv histo."); |
|
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|
4238 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; |
|
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|
4239 memset(_surviving_young_words, 0, real_length * sizeof(size_t)); |
|
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|
4240 |
|
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4241 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer; |
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4242 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer; |
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4243 |
|
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4244 _start = os::elapsedTime(); |
|
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4245 } |
| 342 | 4246 |
| 1709 | 4247 void |
| 4248 G1ParScanThreadState::print_termination_stats_hdr(outputStream* const st) | |
| 4249 { | |
| 4250 st->print_raw_cr("GC Termination Stats"); | |
| 4251 st->print_raw_cr(" elapsed --strong roots-- -------termination-------" | |
| 4252 " ------waste (KiB)------"); | |
| 4253 st->print_raw_cr("thr ms ms % ms % attempts" | |
| 4254 " total alloc undo"); | |
| 4255 st->print_raw_cr("--- --------- --------- ------ --------- ------ --------" | |
| 4256 " ------- ------- -------"); | |
| 4257 } | |
| 4258 | |
| 4259 void | |
| 4260 G1ParScanThreadState::print_termination_stats(int i, | |
| 4261 outputStream* const st) const | |
| 4262 { | |
| 4263 const double elapsed_ms = elapsed_time() * 1000.0; | |
| 4264 const double s_roots_ms = strong_roots_time() * 1000.0; | |
| 4265 const double term_ms = term_time() * 1000.0; | |
| 4266 st->print_cr("%3d %9.2f %9.2f %6.2f " | |
| 4267 "%9.2f %6.2f " SIZE_FORMAT_W(8) " " | |
| 4268 SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7), | |
| 4269 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
| 4270 term_ms, term_ms * 100 / elapsed_ms, term_attempts(), | |
| 4271 (alloc_buffer_waste() + undo_waste()) * HeapWordSize / K, | |
| 4272 alloc_buffer_waste() * HeapWordSize / K, | |
| 4273 undo_waste() * HeapWordSize / K); | |
| 4274 } | |
| 4275 | |
|
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|
4276 #ifdef ASSERT |
|
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4277 bool G1ParScanThreadState::verify_ref(narrowOop* ref) const { |
|
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4278 assert(ref != NULL, "invariant"); |
|
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4279 assert(UseCompressedOops, "sanity"); |
|
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4280 assert(!has_partial_array_mask(ref), err_msg("ref=" PTR_FORMAT, ref)); |
|
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4281 oop p = oopDesc::load_decode_heap_oop(ref); |
|
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4282 assert(_g1h->is_in_g1_reserved(p), |
|
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|
4283 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
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|
4284 return true; |
|
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|
4285 } |
|
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|
4286 |
|
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|
4287 bool G1ParScanThreadState::verify_ref(oop* ref) const { |
|
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|
4288 assert(ref != NULL, "invariant"); |
|
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|
4289 if (has_partial_array_mask(ref)) { |
|
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4290 // Must be in the collection set--it's already been copied. |
|
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|
4291 oop p = clear_partial_array_mask(ref); |
|
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4292 assert(_g1h->obj_in_cs(p), |
|
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|
4293 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
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4294 } else { |
|
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|
4295 oop p = oopDesc::load_decode_heap_oop(ref); |
|
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4296 assert(_g1h->is_in_g1_reserved(p), |
|
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|
4297 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
|
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|
4298 } |
|
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|
4299 return true; |
|
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|
4300 } |
|
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|
4301 |
|
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|
4302 bool G1ParScanThreadState::verify_task(StarTask ref) const { |
|
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|
4303 if (ref.is_narrow()) { |
|
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|
4304 return verify_ref((narrowOop*) ref); |
|
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|
4305 } else { |
|
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|
4306 return verify_ref((oop*) ref); |
|
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|
4307 } |
|
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|
4308 } |
|
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|
4309 #endif // ASSERT |
|
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|
4310 |
|
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|
4311 void G1ParScanThreadState::trim_queue() { |
|
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|
4312 StarTask ref; |
|
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|
4313 do { |
|
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|
4314 // Drain the overflow stack first, so other threads can steal. |
|
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|
4315 while (refs()->pop_overflow(ref)) { |
|
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|
4316 deal_with_reference(ref); |
|
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|
4317 } |
|
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|
4318 while (refs()->pop_local(ref)) { |
|
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4319 deal_with_reference(ref); |
|
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|
4320 } |
|
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|
4321 } while (!refs()->is_empty()); |
|
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|
4322 } |
|
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|
4323 |
| 342 | 4324 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : |
| 4325 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), | |
| 4326 _par_scan_state(par_scan_state) { } | |
| 4327 | |
|
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|
4328 template <class T> void G1ParCopyHelper::mark_forwardee(T* p) { |
| 342 | 4329 // This is called _after_ do_oop_work has been called, hence after |
| 4330 // the object has been relocated to its new location and *p points | |
| 4331 // to its new location. | |
| 4332 | |
|
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|
4333 T heap_oop = oopDesc::load_heap_oop(p); |
|
df6caf649ff7
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|
4334 if (!oopDesc::is_null(heap_oop)) { |
|
df6caf649ff7
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|
4335 oop obj = oopDesc::decode_heap_oop(heap_oop); |
|
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|
4336 assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj)), |
| 342 | 4337 "shouldn't still be in the CSet if evacuation didn't fail."); |
|
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|
4338 HeapWord* addr = (HeapWord*)obj; |
| 342 | 4339 if (_g1->is_in_g1_reserved(addr)) |
| 4340 _cm->grayRoot(oop(addr)); | |
| 4341 } | |
| 4342 } | |
| 4343 | |
| 4344 oop G1ParCopyHelper::copy_to_survivor_space(oop old) { | |
| 4345 size_t word_sz = old->size(); | |
| 4346 HeapRegion* from_region = _g1->heap_region_containing_raw(old); | |
| 4347 // +1 to make the -1 indexes valid... | |
| 4348 int young_index = from_region->young_index_in_cset()+1; | |
| 4349 assert( (from_region->is_young() && young_index > 0) || | |
| 4350 (!from_region->is_young() && young_index == 0), "invariant" ); | |
| 4351 G1CollectorPolicy* g1p = _g1->g1_policy(); | |
| 4352 markOop m = old->mark(); | |
| 545 | 4353 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
| 4354 : m->age(); | |
| 4355 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
| 342 | 4356 word_sz); |
| 4357 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
| 4358 oop obj = oop(obj_ptr); | |
| 4359 | |
| 4360 if (obj_ptr == NULL) { | |
| 4361 // This will either forward-to-self, or detect that someone else has | |
| 4362 // installed a forwarding pointer. | |
| 4363 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
| 4364 return _g1->handle_evacuation_failure_par(cl, old); | |
| 4365 } | |
| 4366 | |
| 526 | 4367 // We're going to allocate linearly, so might as well prefetch ahead. |
| 4368 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
| 4369 | |
| 342 | 4370 oop forward_ptr = old->forward_to_atomic(obj); |
| 4371 if (forward_ptr == NULL) { | |
| 4372 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
| 526 | 4373 if (g1p->track_object_age(alloc_purpose)) { |
| 4374 // We could simply do obj->incr_age(). However, this causes a | |
| 4375 // performance issue. obj->incr_age() will first check whether | |
| 4376 // the object has a displaced mark by checking its mark word; | |
| 4377 // getting the mark word from the new location of the object | |
| 4378 // stalls. So, given that we already have the mark word and we | |
| 4379 // are about to install it anyway, it's better to increase the | |
| 4380 // age on the mark word, when the object does not have a | |
| 4381 // displaced mark word. We're not expecting many objects to have | |
| 4382 // a displaced marked word, so that case is not optimized | |
| 4383 // further (it could be...) and we simply call obj->incr_age(). | |
| 4384 | |
| 4385 if (m->has_displaced_mark_helper()) { | |
| 4386 // in this case, we have to install the mark word first, | |
| 4387 // otherwise obj looks to be forwarded (the old mark word, | |
| 4388 // which contains the forward pointer, was copied) | |
| 4389 obj->set_mark(m); | |
| 4390 obj->incr_age(); | |
| 4391 } else { | |
| 4392 m = m->incr_age(); | |
| 545 | 4393 obj->set_mark(m); |
| 526 | 4394 } |
| 545 | 4395 _par_scan_state->age_table()->add(obj, word_sz); |
| 4396 } else { | |
| 4397 obj->set_mark(m); | |
| 526 | 4398 } |
| 4399 | |
| 342 | 4400 // preserve "next" mark bit |
| 4401 if (_g1->mark_in_progress() && !_g1->is_obj_ill(old)) { | |
| 4402 if (!use_local_bitmaps || | |
| 4403 !_par_scan_state->alloc_buffer(alloc_purpose)->mark(obj_ptr)) { | |
| 4404 // if we couldn't mark it on the local bitmap (this happens when | |
| 4405 // the object was not allocated in the GCLab), we have to bite | |
| 4406 // the bullet and do the standard parallel mark | |
| 4407 _cm->markAndGrayObjectIfNecessary(obj); | |
| 4408 } | |
| 4409 #if 1 | |
| 4410 if (_g1->isMarkedNext(old)) { | |
| 4411 _cm->nextMarkBitMap()->parClear((HeapWord*)old); | |
| 4412 } | |
| 4413 #endif | |
| 4414 } | |
| 4415 | |
| 4416 size_t* surv_young_words = _par_scan_state->surviving_young_words(); | |
| 4417 surv_young_words[young_index] += word_sz; | |
| 4418 | |
| 4419 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
| 4420 arrayOop(old)->set_length(0); | |
|
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|
4421 oop* old_p = set_partial_array_mask(old); |
|
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|
4422 _par_scan_state->push_on_queue(old_p); |
| 342 | 4423 } else { |
| 526 | 4424 // No point in using the slower heap_region_containing() method, |
| 4425 // given that we know obj is in the heap. | |
| 4426 _scanner->set_region(_g1->heap_region_containing_raw(obj)); | |
| 342 | 4427 obj->oop_iterate_backwards(_scanner); |
| 4428 } | |
| 4429 } else { | |
| 4430 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
| 4431 obj = forward_ptr; | |
| 4432 } | |
| 4433 return obj; | |
| 4434 } | |
| 4435 | |
|
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|
4436 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_forwardee> |
|
845
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|
4437 template <class T> |
|
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|
4438 void G1ParCopyClosure <do_gen_barrier, barrier, do_mark_forwardee> |
|
845
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|
4439 ::do_oop_work(T* p) { |
|
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|
4440 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 4441 assert(barrier != G1BarrierRS || obj != NULL, |
| 4442 "Precondition: G1BarrierRS implies obj is nonNull"); | |
| 4443 | |
| 526 | 4444 // here the null check is implicit in the cset_fast_test() test |
|
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|
4445 if (_g1->in_cset_fast_test(obj)) { |
| 342 | 4446 #if G1_REM_SET_LOGGING |
| 526 | 4447 gclog_or_tty->print_cr("Loc "PTR_FORMAT" contains pointer "PTR_FORMAT" " |
| 4448 "into CS.", p, (void*) obj); | |
| 342 | 4449 #endif |
| 526 | 4450 if (obj->is_forwarded()) { |
|
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|
4451 oopDesc::encode_store_heap_oop(p, obj->forwardee()); |
| 526 | 4452 } else { |
|
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|
4453 oop copy_oop = copy_to_survivor_space(obj); |
|
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|
4454 oopDesc::encode_store_heap_oop(p, copy_oop); |
| 342 | 4455 } |
| 526 | 4456 // When scanning the RS, we only care about objs in CS. |
| 4457 if (barrier == G1BarrierRS) { | |
|
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
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changeset
|
4458 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 342 | 4459 } |
| 526 | 4460 } |
| 4461 | |
| 4462 if (barrier == G1BarrierEvac && obj != NULL) { | |
|
616
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|
4463 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 526 | 4464 } |
| 4465 | |
| 4466 if (do_gen_barrier && obj != NULL) { | |
| 4467 par_do_barrier(p); | |
| 4468 } | |
| 4469 } | |
| 4470 | |
|
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|
4471 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(oop* p); |
|
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4472 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(narrowOop* p); |
|
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4473 |
|
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|
4474 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
| 526 | 4475 assert(has_partial_array_mask(p), "invariant"); |
| 4476 oop old = clear_partial_array_mask(p); | |
| 342 | 4477 assert(old->is_objArray(), "must be obj array"); |
| 4478 assert(old->is_forwarded(), "must be forwarded"); | |
| 4479 assert(Universe::heap()->is_in_reserved(old), "must be in heap."); | |
| 4480 | |
| 4481 objArrayOop obj = objArrayOop(old->forwardee()); | |
| 4482 assert((void*)old != (void*)old->forwardee(), "self forwarding here?"); | |
| 4483 // Process ParGCArrayScanChunk elements now | |
| 4484 // and push the remainder back onto queue | |
| 4485 int start = arrayOop(old)->length(); | |
| 4486 int end = obj->length(); | |
| 4487 int remainder = end - start; | |
| 4488 assert(start <= end, "just checking"); | |
| 4489 if (remainder > 2 * ParGCArrayScanChunk) { | |
| 4490 // Test above combines last partial chunk with a full chunk | |
| 4491 end = start + ParGCArrayScanChunk; | |
| 4492 arrayOop(old)->set_length(end); | |
| 4493 // Push remainder. | |
|
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4494 oop* old_p = set_partial_array_mask(old); |
|
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|
4495 assert(arrayOop(old)->length() < obj->length(), "Empty push?"); |
|
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4496 _par_scan_state->push_on_queue(old_p); |
| 342 | 4497 } else { |
| 4498 // Restore length so that the heap remains parsable in | |
| 4499 // case of evacuation failure. | |
| 4500 arrayOop(old)->set_length(end); | |
| 4501 } | |
|
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4502 _scanner.set_region(_g1->heap_region_containing_raw(obj)); |
| 342 | 4503 // process our set of indices (include header in first chunk) |
|
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|
4504 obj->oop_iterate_range(&_scanner, start, end); |
| 342 | 4505 } |
| 4506 | |
| 4507 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
| 4508 protected: | |
| 4509 G1CollectedHeap* _g1h; | |
| 4510 G1ParScanThreadState* _par_scan_state; | |
| 4511 RefToScanQueueSet* _queues; | |
| 4512 ParallelTaskTerminator* _terminator; | |
| 4513 | |
| 4514 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
| 4515 RefToScanQueueSet* queues() { return _queues; } | |
| 4516 ParallelTaskTerminator* terminator() { return _terminator; } | |
| 4517 | |
| 4518 public: | |
| 4519 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
| 4520 G1ParScanThreadState* par_scan_state, | |
| 4521 RefToScanQueueSet* queues, | |
| 4522 ParallelTaskTerminator* terminator) | |
| 4523 : _g1h(g1h), _par_scan_state(par_scan_state), | |
| 4524 _queues(queues), _terminator(terminator) {} | |
| 4525 | |
|
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4526 void do_void(); |
|
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4527 |
|
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4528 private: |
|
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4529 inline bool offer_termination(); |
|
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4530 }; |
|
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4531 |
|
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4532 bool G1ParEvacuateFollowersClosure::offer_termination() { |
|
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4533 G1ParScanThreadState* const pss = par_scan_state(); |
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4534 pss->start_term_time(); |
|
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4535 const bool res = terminator()->offer_termination(); |
|
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4536 pss->end_term_time(); |
|
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|
4537 return res; |
|
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|
4538 } |
|
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4539 |
|
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|
4540 void G1ParEvacuateFollowersClosure::do_void() { |
|
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|
4541 StarTask stolen_task; |
|
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4542 G1ParScanThreadState* const pss = par_scan_state(); |
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4543 pss->trim_queue(); |
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4544 |
|
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|
4545 do { |
|
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|
4546 while (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
|
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4547 assert(pss->verify_task(stolen_task), "sanity"); |
|
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4548 if (stolen_task.is_narrow()) { |
|
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|
4549 pss->deal_with_reference((narrowOop*) stolen_task); |
|
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4550 } else { |
|
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|
4551 pss->deal_with_reference((oop*) stolen_task); |
|
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|
4552 } |
|
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|
4553 |
|
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|
4554 // We've just processed a reference and we might have made |
|
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|
4555 // available new entries on the queues. So we have to make sure |
|
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|
4556 // we drain the queues as necessary. |
| 342 | 4557 pss->trim_queue(); |
| 4558 } | |
|
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|
4559 } while (!offer_termination()); |
|
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|
4560 |
|
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|
4561 pss->retire_alloc_buffers(); |
|
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|
4562 } |
| 342 | 4563 |
| 4564 class G1ParTask : public AbstractGangTask { | |
| 4565 protected: | |
| 4566 G1CollectedHeap* _g1h; | |
| 4567 RefToScanQueueSet *_queues; | |
| 4568 ParallelTaskTerminator _terminator; | |
|
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|
4569 int _n_workers; |
| 342 | 4570 |
| 4571 Mutex _stats_lock; | |
| 4572 Mutex* stats_lock() { return &_stats_lock; } | |
| 4573 | |
| 4574 size_t getNCards() { | |
| 4575 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
| 4576 / G1BlockOffsetSharedArray::N_bytes; | |
| 4577 } | |
| 4578 | |
| 4579 public: | |
| 4580 G1ParTask(G1CollectedHeap* g1h, int workers, RefToScanQueueSet *task_queues) | |
| 4581 : AbstractGangTask("G1 collection"), | |
| 4582 _g1h(g1h), | |
| 4583 _queues(task_queues), | |
| 4584 _terminator(workers, _queues), | |
|
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|
4585 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true), |
|
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|
4586 _n_workers(workers) |
| 342 | 4587 {} |
| 4588 | |
| 4589 RefToScanQueueSet* queues() { return _queues; } | |
| 4590 | |
| 4591 RefToScanQueue *work_queue(int i) { | |
| 4592 return queues()->queue(i); | |
| 4593 } | |
| 4594 | |
| 4595 void work(int i) { | |
|
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|
4596 if (i >= _n_workers) return; // no work needed this round |
| 1611 | 4597 |
| 4598 double start_time_ms = os::elapsedTime() * 1000.0; | |
| 4599 _g1h->g1_policy()->record_gc_worker_start_time(i, start_time_ms); | |
| 4600 | |
| 342 | 4601 ResourceMark rm; |
| 4602 HandleMark hm; | |
| 4603 | |
| 526 | 4604 G1ParScanThreadState pss(_g1h, i); |
| 4605 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss); | |
| 4606 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss); | |
| 4607 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss); | |
| 342 | 4608 |
| 4609 pss.set_evac_closure(&scan_evac_cl); | |
| 4610 pss.set_evac_failure_closure(&evac_failure_cl); | |
| 4611 pss.set_partial_scan_closure(&partial_scan_cl); | |
| 4612 | |
| 4613 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss); | |
| 4614 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss); | |
| 4615 G1ParScanHeapRSClosure only_scan_heap_rs_cl(_g1h, &pss); | |
|
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|
4616 G1ParPushHeapRSClosure push_heap_rs_cl(_g1h, &pss); |
|
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
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|
4617 |
| 342 | 4618 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss); |
| 4619 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss); | |
| 4620 G1ParScanAndMarkHeapRSClosure scan_mark_heap_rs_cl(_g1h, &pss); | |
| 4621 | |
| 4622 OopsInHeapRegionClosure *scan_root_cl; | |
| 4623 OopsInHeapRegionClosure *scan_perm_cl; | |
| 4624 | |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
4625 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
| 342 | 4626 scan_root_cl = &scan_mark_root_cl; |
| 4627 scan_perm_cl = &scan_mark_perm_cl; | |
| 4628 } else { | |
| 4629 scan_root_cl = &only_scan_root_cl; | |
| 4630 scan_perm_cl = &only_scan_perm_cl; | |
| 4631 } | |
| 4632 | |
| 4633 pss.start_strong_roots(); | |
| 4634 _g1h->g1_process_strong_roots(/* not collecting perm */ false, | |
| 4635 SharedHeap::SO_AllClasses, | |
| 4636 scan_root_cl, | |
|
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|
4637 &push_heap_rs_cl, |
| 342 | 4638 scan_perm_cl, |
| 4639 i); | |
| 4640 pss.end_strong_roots(); | |
| 4641 { | |
| 4642 double start = os::elapsedTime(); | |
| 4643 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); | |
| 4644 evac.do_void(); | |
| 4645 double elapsed_ms = (os::elapsedTime()-start)*1000.0; | |
| 4646 double term_ms = pss.term_time()*1000.0; | |
| 4647 _g1h->g1_policy()->record_obj_copy_time(i, elapsed_ms-term_ms); | |
| 1611 | 4648 _g1h->g1_policy()->record_termination(i, term_ms, pss.term_attempts()); |
| 342 | 4649 } |
| 1282 | 4650 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
| 342 | 4651 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
| 4652 | |
| 4653 // Clean up any par-expanded rem sets. | |
| 4654 HeapRegionRemSet::par_cleanup(); | |
| 4655 | |
| 4656 if (ParallelGCVerbose) { | |
| 1709 | 4657 MutexLocker x(stats_lock()); |
| 4658 pss.print_termination_stats(i); | |
| 342 | 4659 } |
| 4660 | |
|
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|
4661 assert(pss.refs()->is_empty(), "should be empty"); |
| 1611 | 4662 double end_time_ms = os::elapsedTime() * 1000.0; |
| 4663 _g1h->g1_policy()->record_gc_worker_end_time(i, end_time_ms); | |
| 342 | 4664 } |
| 4665 }; | |
| 4666 | |
| 4667 // *** Common G1 Evacuation Stuff | |
| 4668 | |
|
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8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
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1755
diff
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|
4669 // This method is run in a GC worker. |
|
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|
4670 |
| 342 | 4671 void |
| 4672 G1CollectedHeap:: | |
| 4673 g1_process_strong_roots(bool collecting_perm_gen, | |
| 4674 SharedHeap::ScanningOption so, | |
| 4675 OopClosure* scan_non_heap_roots, | |
| 4676 OopsInHeapRegionClosure* scan_rs, | |
| 4677 OopsInGenClosure* scan_perm, | |
| 4678 int worker_i) { | |
| 4679 // First scan the strong roots, including the perm gen. | |
| 4680 double ext_roots_start = os::elapsedTime(); | |
| 4681 double closure_app_time_sec = 0.0; | |
| 4682 | |
| 4683 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
| 4684 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
| 4685 buf_scan_perm.set_generation(perm_gen()); | |
| 4686 | |
|
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|
4687 // Walk the code cache w/o buffering, because StarTask cannot handle |
|
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diff
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|
4688 // unaligned oop locations. |
|
148e5441d916
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diff
changeset
|
4689 CodeBlobToOopClosure eager_scan_code_roots(scan_non_heap_roots, /*do_marking=*/ true); |
|
148e5441d916
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|
4690 |
|
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diff
changeset
|
4691 process_strong_roots(false, // no scoping; this is parallel code |
|
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890
diff
changeset
|
4692 collecting_perm_gen, so, |
| 342 | 4693 &buf_scan_non_heap_roots, |
|
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diff
changeset
|
4694 &eager_scan_code_roots, |
| 342 | 4695 &buf_scan_perm); |
|
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1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
4696 |
| 342 | 4697 // Finish up any enqueued closure apps. |
| 4698 buf_scan_non_heap_roots.done(); | |
| 4699 buf_scan_perm.done(); | |
| 4700 double ext_roots_end = os::elapsedTime(); | |
| 4701 g1_policy()->reset_obj_copy_time(worker_i); | |
| 4702 double obj_copy_time_sec = | |
| 4703 buf_scan_non_heap_roots.closure_app_seconds() + | |
| 4704 buf_scan_perm.closure_app_seconds(); | |
| 4705 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); | |
| 4706 double ext_root_time_ms = | |
| 4707 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
| 4708 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); | |
| 4709 | |
| 4710 // Scan strong roots in mark stack. | |
| 4711 if (!_process_strong_tasks->is_task_claimed(G1H_PS_mark_stack_oops_do)) { | |
| 4712 concurrent_mark()->oops_do(scan_non_heap_roots); | |
| 4713 } | |
| 4714 double mark_stack_scan_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; | |
| 4715 g1_policy()->record_mark_stack_scan_time(worker_i, mark_stack_scan_ms); | |
| 4716 | |
| 4717 // XXX What should this be doing in the parallel case? | |
| 4718 g1_policy()->record_collection_pause_end_CH_strong_roots(); | |
| 4719 // Now scan the complement of the collection set. | |
| 4720 if (scan_rs != NULL) { | |
| 4721 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
| 4722 } | |
| 4723 // Finish with the ref_processor roots. | |
| 4724 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { | |
|
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
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diff
changeset
|
4725 // We need to treat the discovered reference lists as roots and |
|
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diff
changeset
|
4726 // keep entries (which are added by the marking threads) on them |
|
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|
4727 // live until they can be processed at the end of marking. |
|
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|
4728 ref_processor()->weak_oops_do(scan_non_heap_roots); |
| 342 | 4729 ref_processor()->oops_do(scan_non_heap_roots); |
| 4730 } | |
| 4731 g1_policy()->record_collection_pause_end_G1_strong_roots(); | |
| 4732 _process_strong_tasks->all_tasks_completed(); | |
| 4733 } | |
| 4734 | |
| 4735 void | |
| 4736 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
| 4737 OopClosure* non_root_closure) { | |
|
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|
4738 CodeBlobToOopClosure roots_in_blobs(root_closure, /*do_marking=*/ false); |
|
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|
4739 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs, non_root_closure); |
| 342 | 4740 } |
| 4741 | |
| 4742 | |
| 4743 class SaveMarksClosure: public HeapRegionClosure { | |
| 4744 public: | |
| 4745 bool doHeapRegion(HeapRegion* r) { | |
| 4746 r->save_marks(); | |
| 4747 return false; | |
| 4748 } | |
| 4749 }; | |
| 4750 | |
| 4751 void G1CollectedHeap::save_marks() { | |
|
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|
4752 if (!CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 4753 SaveMarksClosure sm; |
| 4754 heap_region_iterate(&sm); | |
| 4755 } | |
| 4756 // We do this even in the parallel case | |
| 4757 perm_gen()->save_marks(); | |
| 4758 } | |
| 4759 | |
| 4760 void G1CollectedHeap::evacuate_collection_set() { | |
| 4761 set_evacuation_failed(false); | |
| 4762 | |
| 4763 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
| 4764 concurrent_g1_refine()->set_use_cache(false); | |
| 889 | 4765 concurrent_g1_refine()->clear_hot_cache_claimed_index(); |
| 4766 | |
| 342 | 4767 int n_workers = (ParallelGCThreads > 0 ? workers()->total_workers() : 1); |
| 4768 set_par_threads(n_workers); | |
| 4769 G1ParTask g1_par_task(this, n_workers, _task_queues); | |
| 4770 | |
| 4771 init_for_evac_failure(NULL); | |
| 4772 | |
| 4773 rem_set()->prepare_for_younger_refs_iterate(true); | |
|
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|
4774 |
|
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|
4775 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
| 342 | 4776 double start_par = os::elapsedTime(); |
|
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|
4777 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 4778 // The individual threads will set their evac-failure closures. |
|
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|
4779 StrongRootsScope srs(this); |
| 1709 | 4780 if (ParallelGCVerbose) G1ParScanThreadState::print_termination_stats_hdr(); |
| 342 | 4781 workers()->run_task(&g1_par_task); |
| 4782 } else { | |
|
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|
4783 StrongRootsScope srs(this); |
| 342 | 4784 g1_par_task.work(0); |
| 4785 } | |
| 4786 | |
| 4787 double par_time = (os::elapsedTime() - start_par) * 1000.0; | |
| 4788 g1_policy()->record_par_time(par_time); | |
| 4789 set_par_threads(0); | |
| 4790 // Is this the right thing to do here? We don't save marks | |
| 4791 // on individual heap regions when we allocate from | |
| 4792 // them in parallel, so this seems like the correct place for this. | |
| 545 | 4793 retire_all_alloc_regions(); |
|
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|
4794 |
|
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|
4795 // Weak root processing. |
|
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diff
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|
4796 // Note: when JSR 292 is enabled and code blobs can contain |
|
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|
4797 // non-perm oops then we will need to process the code blobs |
|
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diff
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|
4798 // here too. |
| 342 | 4799 { |
| 4800 G1IsAliveClosure is_alive(this); | |
| 4801 G1KeepAliveClosure keep_alive(this); | |
| 4802 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
| 4803 } | |
|
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|
4804 release_gc_alloc_regions(false /* totally */); |
| 342 | 4805 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); |
|
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|
4806 |
| 889 | 4807 concurrent_g1_refine()->clear_hot_cache(); |
| 342 | 4808 concurrent_g1_refine()->set_use_cache(true); |
| 4809 | |
| 4810 finalize_for_evac_failure(); | |
| 4811 | |
| 4812 // Must do this before removing self-forwarding pointers, which clears | |
| 4813 // the per-region evac-failure flags. | |
| 4814 concurrent_mark()->complete_marking_in_collection_set(); | |
| 4815 | |
| 4816 if (evacuation_failed()) { | |
| 4817 remove_self_forwarding_pointers(); | |
| 4818 if (PrintGCDetails) { | |
|
1719
b63010841f78
6975964: G1: print out a more descriptive message for evacuation failure when +PrintGCDetails is set
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|
4819 gclog_or_tty->print(" (to-space overflow)"); |
| 342 | 4820 } else if (PrintGC) { |
| 4821 gclog_or_tty->print("--"); | |
| 4822 } | |
| 4823 } | |
| 4824 | |
|
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|
4825 if (G1DeferredRSUpdate) { |
|
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6720309: G1: don't synchronously update RSet during evacuation pauses
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|
4826 RedirtyLoggedCardTableEntryFastClosure redirty; |
|
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|
4827 dirty_card_queue_set().set_closure(&redirty); |
|
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|
4828 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
| 1111 | 4829 |
| 4830 DirtyCardQueueSet& dcq = JavaThread::dirty_card_queue_set(); | |
| 4831 dcq.merge_bufferlists(&dirty_card_queue_set()); | |
|
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|
4832 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
|
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|
4833 } |
| 342 | 4834 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
| 4835 } | |
| 4836 | |
| 4837 void G1CollectedHeap::free_region(HeapRegion* hr) { | |
| 4838 size_t pre_used = 0; | |
| 4839 size_t cleared_h_regions = 0; | |
| 4840 size_t freed_regions = 0; | |
| 4841 UncleanRegionList local_list; | |
| 4842 | |
| 4843 HeapWord* start = hr->bottom(); | |
| 4844 HeapWord* end = hr->prev_top_at_mark_start(); | |
| 4845 size_t used_bytes = hr->used(); | |
| 4846 size_t live_bytes = hr->max_live_bytes(); | |
| 4847 if (used_bytes > 0) { | |
| 4848 guarantee( live_bytes <= used_bytes, "invariant" ); | |
| 4849 } else { | |
| 4850 guarantee( live_bytes == 0, "invariant" ); | |
| 4851 } | |
| 4852 | |
| 4853 size_t garbage_bytes = used_bytes - live_bytes; | |
| 4854 if (garbage_bytes > 0) | |
| 4855 g1_policy()->decrease_known_garbage_bytes(garbage_bytes); | |
| 4856 | |
| 4857 free_region_work(hr, pre_used, cleared_h_regions, freed_regions, | |
| 4858 &local_list); | |
| 4859 finish_free_region_work(pre_used, cleared_h_regions, freed_regions, | |
| 4860 &local_list); | |
| 4861 } | |
| 4862 | |
| 4863 void | |
| 4864 G1CollectedHeap::free_region_work(HeapRegion* hr, | |
| 4865 size_t& pre_used, | |
| 4866 size_t& cleared_h_regions, | |
| 4867 size_t& freed_regions, | |
| 4868 UncleanRegionList* list, | |
| 4869 bool par) { | |
| 4870 pre_used += hr->used(); | |
| 4871 if (hr->isHumongous()) { | |
| 4872 assert(hr->startsHumongous(), | |
| 4873 "Only the start of a humongous region should be freed."); | |
| 4874 int ind = _hrs->find(hr); | |
| 4875 assert(ind != -1, "Should have an index."); | |
| 4876 // Clear the start region. | |
| 4877 hr->hr_clear(par, true /*clear_space*/); | |
| 4878 list->insert_before_head(hr); | |
| 4879 cleared_h_regions++; | |
| 4880 freed_regions++; | |
| 4881 // Clear any continued regions. | |
| 4882 ind++; | |
| 4883 while ((size_t)ind < n_regions()) { | |
| 4884 HeapRegion* hrc = _hrs->at(ind); | |
| 4885 if (!hrc->continuesHumongous()) break; | |
| 4886 // Otherwise, does continue the H region. | |
| 4887 assert(hrc->humongous_start_region() == hr, "Huh?"); | |
| 4888 hrc->hr_clear(par, true /*clear_space*/); | |
| 4889 cleared_h_regions++; | |
| 4890 freed_regions++; | |
| 4891 list->insert_before_head(hrc); | |
| 4892 ind++; | |
| 4893 } | |
| 4894 } else { | |
| 4895 hr->hr_clear(par, true /*clear_space*/); | |
| 4896 list->insert_before_head(hr); | |
| 4897 freed_regions++; | |
| 4898 // If we're using clear2, this should not be enabled. | |
| 4899 // assert(!hr->in_cohort(), "Can't be both free and in a cohort."); | |
| 4900 } | |
| 4901 } | |
| 4902 | |
| 4903 void G1CollectedHeap::finish_free_region_work(size_t pre_used, | |
| 4904 size_t cleared_h_regions, | |
| 4905 size_t freed_regions, | |
| 4906 UncleanRegionList* list) { | |
| 4907 if (list != NULL && list->sz() > 0) { | |
| 4908 prepend_region_list_on_unclean_list(list); | |
| 4909 } | |
| 4910 // Acquire a lock, if we're parallel, to update possibly-shared | |
| 4911 // variables. | |
| 4912 Mutex* lock = (n_par_threads() > 0) ? ParGCRareEvent_lock : NULL; | |
| 4913 { | |
| 4914 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); | |
| 4915 _summary_bytes_used -= pre_used; | |
| 4916 _num_humongous_regions -= (int) cleared_h_regions; | |
| 4917 _free_regions += freed_regions; | |
| 4918 } | |
| 4919 } | |
| 4920 | |
| 4921 | |
| 4922 void G1CollectedHeap::dirtyCardsForYoungRegions(CardTableModRefBS* ct_bs, HeapRegion* list) { | |
| 4923 while (list != NULL) { | |
| 4924 guarantee( list->is_young(), "invariant" ); | |
| 4925 | |
| 4926 HeapWord* bottom = list->bottom(); | |
| 4927 HeapWord* end = list->end(); | |
| 4928 MemRegion mr(bottom, end); | |
| 4929 ct_bs->dirty(mr); | |
| 4930 | |
| 4931 list = list->get_next_young_region(); | |
| 4932 } | |
| 4933 } | |
| 4934 | |
|
796
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6819065: G1: eliminate high serial card table clearing time
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794
diff
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|
4935 |
|
29e7d79232b9
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|
4936 class G1ParCleanupCTTask : public AbstractGangTask { |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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|
4937 CardTableModRefBS* _ct_bs; |
|
29e7d79232b9
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diff
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|
4938 G1CollectedHeap* _g1h; |
|
940
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6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
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|
4939 HeapRegion* volatile _su_head; |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
changeset
|
4940 public: |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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diff
changeset
|
4941 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
|
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
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|
4942 G1CollectedHeap* g1h, |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
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|
4943 HeapRegion* survivor_list) : |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
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|
4944 AbstractGangTask("G1 Par Cleanup CT Task"), |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
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|
4945 _ct_bs(ct_bs), |
|
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
4946 _g1h(g1h), |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
4947 _su_head(survivor_list) |
|
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
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|
4948 { } |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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diff
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|
4949 |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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diff
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|
4950 void work(int i) { |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
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changeset
|
4951 HeapRegion* r; |
|
29e7d79232b9
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|
4952 while (r = _g1h->pop_dirty_cards_region()) { |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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|
4953 clear_cards(r); |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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|
4954 } |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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1391
diff
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|
4955 // Redirty the cards of the survivor regions. |
|
940
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6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
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|
4956 dirty_list(&this->_su_head); |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
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|
4957 } |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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|
4958 |
|
796
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6819065: G1: eliminate high serial card table clearing time
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|
4959 void clear_cards(HeapRegion* r) { |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
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|
4960 // Cards for Survivor regions will be dirtied later. |
|
1316cec51b4d
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1391
diff
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|
4961 if (!r->is_survivor()) { |
|
796
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|
4962 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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|
4963 } |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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|
4964 } |
|
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
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936
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|
4965 |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
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|
4966 void dirty_list(HeapRegion* volatile * head_ptr) { |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
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|
4967 HeapRegion* head; |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
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|
4968 do { |
|
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6841313: G1: dirty cards of survivor regions in parallel
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936
diff
changeset
|
4969 // Pop region off the list. |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
4970 head = *head_ptr; |
|
8624da129f0b
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apetrusenko
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936
diff
changeset
|
4971 if (head != NULL) { |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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changeset
|
4972 HeapRegion* r = (HeapRegion*) |
|
8624da129f0b
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apetrusenko
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diff
changeset
|
4973 Atomic::cmpxchg_ptr(head->get_next_young_region(), head_ptr, head); |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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diff
changeset
|
4974 if (r == head) { |
|
8624da129f0b
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changeset
|
4975 assert(!r->isHumongous(), "Humongous regions shouldn't be on survivor list"); |
|
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6841313: G1: dirty cards of survivor regions in parallel
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|
4976 _ct_bs->dirty(MemRegion(r->bottom(), r->end())); |
|
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6841313: G1: dirty cards of survivor regions in parallel
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|
4977 } |
|
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|
4978 } |
|
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|
4979 } while (*head_ptr != NULL); |
|
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apetrusenko
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|
4980 } |
|
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|
4981 }; |
|
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|
4982 |
|
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|
4983 |
|
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|
4984 #ifndef PRODUCT |
|
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|
4985 class G1VerifyCardTableCleanup: public HeapRegionClosure { |
|
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changeset
|
4986 CardTableModRefBS* _ct_bs; |
|
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|
4987 public: |
|
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|
4988 G1VerifyCardTableCleanup(CardTableModRefBS* ct_bs) |
|
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4989 : _ct_bs(ct_bs) |
|
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|
4990 { } |
|
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|
4991 virtual bool doHeapRegion(HeapRegion* r) |
|
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4992 { |
|
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|
4993 MemRegion mr(r->bottom(), r->end()); |
|
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4994 if (r->is_survivor()) { |
|
940
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|
4995 _ct_bs->verify_dirty_region(mr); |
|
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4996 } else { |
|
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|
4997 _ct_bs->verify_clean_region(mr); |
|
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|
4998 } |
|
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|
4999 return false; |
|
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|
5000 } |
|
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|
5001 }; |
|
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|
5002 #endif |
|
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|
5003 |
| 342 | 5004 void G1CollectedHeap::cleanUpCardTable() { |
| 5005 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
| 5006 double start = os::elapsedTime(); | |
| 5007 | |
|
796
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|
5008 // Iterate over the dirty cards region list. |
|
940
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5009 G1ParCleanupCTTask cleanup_task(ct_bs, this, |
|
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|
5010 _young_list->first_survivor_region()); |
|
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|
5011 |
|
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|
5012 if (ParallelGCThreads > 0) { |
|
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|
5013 set_par_threads(workers()->total_workers()); |
|
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|
5014 workers()->run_task(&cleanup_task); |
|
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5015 set_par_threads(0); |
|
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5016 } else { |
|
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|
5017 while (_dirty_cards_region_list) { |
|
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|
5018 HeapRegion* r = _dirty_cards_region_list; |
|
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|
5019 cleanup_task.clear_cards(r); |
|
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5020 _dirty_cards_region_list = r->get_next_dirty_cards_region(); |
|
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5021 if (_dirty_cards_region_list == r) { |
|
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5022 // The last region. |
|
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5023 _dirty_cards_region_list = NULL; |
|
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|
5024 } |
|
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|
5025 r->set_next_dirty_cards_region(NULL); |
|
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|
5026 } |
|
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|
5027 // now, redirty the cards of the survivor regions |
|
940
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5028 // (it seemed faster to do it this way, instead of iterating over |
|
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5029 // all regions and then clearing / dirtying as appropriate) |
|
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|
5030 dirtyCardsForYoungRegions(ct_bs, _young_list->first_survivor_region()); |
|
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|
5031 } |
|
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|
5032 |
| 342 | 5033 double elapsed = os::elapsedTime() - start; |
| 5034 g1_policy()->record_clear_ct_time( elapsed * 1000.0); | |
|
940
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|
5035 #ifndef PRODUCT |
|
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|
5036 if (G1VerifyCTCleanup || VerifyAfterGC) { |
|
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|
5037 G1VerifyCardTableCleanup cleanup_verifier(ct_bs); |
|
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|
5038 heap_region_iterate(&cleanup_verifier); |
|
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|
5039 } |
|
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|
5040 #endif |
| 342 | 5041 } |
| 5042 | |
| 5043 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
| 5044 double young_time_ms = 0.0; | |
| 5045 double non_young_time_ms = 0.0; | |
| 5046 | |
|
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|
5047 // Since the collection set is a superset of the the young list, |
|
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|
5048 // all we need to do to clear the young list is clear its |
|
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|
5049 // head and length, and unlink any young regions in the code below |
|
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|
5050 _young_list->clear(); |
|
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|
5051 |
| 342 | 5052 G1CollectorPolicy* policy = g1_policy(); |
| 5053 | |
| 5054 double start_sec = os::elapsedTime(); | |
| 5055 bool non_young = true; | |
| 5056 | |
| 5057 HeapRegion* cur = cs_head; | |
| 5058 int age_bound = -1; | |
| 5059 size_t rs_lengths = 0; | |
| 5060 | |
| 5061 while (cur != NULL) { | |
| 5062 if (non_young) { | |
| 5063 if (cur->is_young()) { | |
| 5064 double end_sec = os::elapsedTime(); | |
| 5065 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 5066 non_young_time_ms += elapsed_ms; | |
| 5067 | |
| 5068 start_sec = os::elapsedTime(); | |
| 5069 non_young = false; | |
| 5070 } | |
| 5071 } else { | |
| 5072 if (!cur->is_on_free_list()) { | |
| 5073 double end_sec = os::elapsedTime(); | |
| 5074 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 5075 young_time_ms += elapsed_ms; | |
| 5076 | |
| 5077 start_sec = os::elapsedTime(); | |
| 5078 non_young = true; | |
| 5079 } | |
| 5080 } | |
| 5081 | |
| 5082 rs_lengths += cur->rem_set()->occupied(); | |
| 5083 | |
| 5084 HeapRegion* next = cur->next_in_collection_set(); | |
| 5085 assert(cur->in_collection_set(), "bad CS"); | |
| 5086 cur->set_next_in_collection_set(NULL); | |
| 5087 cur->set_in_collection_set(false); | |
| 5088 | |
| 5089 if (cur->is_young()) { | |
| 5090 int index = cur->young_index_in_cset(); | |
| 5091 guarantee( index != -1, "invariant" ); | |
| 5092 guarantee( (size_t)index < policy->young_cset_length(), "invariant" ); | |
| 5093 size_t words_survived = _surviving_young_words[index]; | |
| 5094 cur->record_surv_words_in_group(words_survived); | |
|
1394
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|
5095 |
|
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|
5096 // At this point the we have 'popped' cur from the collection set |
|
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|
5097 // (linked via next_in_collection_set()) but it is still in the |
|
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|
5098 // young list (linked via next_young_region()). Clear the |
|
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|
5099 // _next_young_region field. |
|
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|
5100 cur->set_next_young_region(NULL); |
| 342 | 5101 } else { |
| 5102 int index = cur->young_index_in_cset(); | |
| 5103 guarantee( index == -1, "invariant" ); | |
| 5104 } | |
| 5105 | |
| 5106 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
| 5107 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
| 5108 "invariant" ); | |
| 5109 | |
| 5110 if (!cur->evacuation_failed()) { | |
| 5111 // And the region is empty. | |
| 5112 assert(!cur->is_empty(), | |
| 5113 "Should not have empty regions in a CS."); | |
| 5114 free_region(cur); | |
| 5115 } else { | |
| 5116 cur->uninstall_surv_rate_group(); | |
| 5117 if (cur->is_young()) | |
| 5118 cur->set_young_index_in_cset(-1); | |
| 5119 cur->set_not_young(); | |
| 5120 cur->set_evacuation_failed(false); | |
| 5121 } | |
| 5122 cur = next; | |
| 5123 } | |
| 5124 | |
| 5125 policy->record_max_rs_lengths(rs_lengths); | |
| 5126 policy->cset_regions_freed(); | |
| 5127 | |
| 5128 double end_sec = os::elapsedTime(); | |
| 5129 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 5130 if (non_young) | |
| 5131 non_young_time_ms += elapsed_ms; | |
| 5132 else | |
| 5133 young_time_ms += elapsed_ms; | |
| 5134 | |
| 5135 policy->record_young_free_cset_time_ms(young_time_ms); | |
| 5136 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
| 5137 } | |
| 5138 | |
|
1394
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|
5139 // This routine is similar to the above but does not record |
|
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|
5140 // any policy statistics or update free lists; we are abandoning |
|
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|
5141 // the current incremental collection set in preparation of a |
|
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|
5142 // full collection. After the full GC we will start to build up |
|
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|
5143 // the incremental collection set again. |
|
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|
5144 // This is only called when we're doing a full collection |
|
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|
5145 // and is immediately followed by the tearing down of the young list. |
|
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|
5146 |
|
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|
5147 void G1CollectedHeap::abandon_collection_set(HeapRegion* cs_head) { |
|
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|
5148 HeapRegion* cur = cs_head; |
|
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|
5149 |
|
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|
5150 while (cur != NULL) { |
|
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|
5151 HeapRegion* next = cur->next_in_collection_set(); |
|
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|
5152 assert(cur->in_collection_set(), "bad CS"); |
|
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|
5153 cur->set_next_in_collection_set(NULL); |
|
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|
5154 cur->set_in_collection_set(false); |
|
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|
5155 cur->set_young_index_in_cset(-1); |
|
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|
5156 cur = next; |
|
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changeset
|
5157 } |
|
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|
5158 } |
|
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|
5159 |
| 342 | 5160 HeapRegion* |
| 5161 G1CollectedHeap::alloc_region_from_unclean_list_locked(bool zero_filled) { | |
| 5162 assert(ZF_mon->owned_by_self(), "Precondition"); | |
| 5163 HeapRegion* res = pop_unclean_region_list_locked(); | |
| 5164 if (res != NULL) { | |
| 5165 assert(!res->continuesHumongous() && | |
| 5166 res->zero_fill_state() != HeapRegion::Allocated, | |
| 5167 "Only free regions on unclean list."); | |
| 5168 if (zero_filled) { | |
| 5169 res->ensure_zero_filled_locked(); | |
| 5170 res->set_zero_fill_allocated(); | |
| 5171 } | |
| 5172 } | |
| 5173 return res; | |
| 5174 } | |
| 5175 | |
| 5176 HeapRegion* G1CollectedHeap::alloc_region_from_unclean_list(bool zero_filled) { | |
| 5177 MutexLockerEx zx(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5178 return alloc_region_from_unclean_list_locked(zero_filled); | |
| 5179 } | |
| 5180 | |
| 5181 void G1CollectedHeap::put_region_on_unclean_list(HeapRegion* r) { | |
| 5182 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5183 put_region_on_unclean_list_locked(r); | |
| 5184 if (should_zf()) ZF_mon->notify_all(); // Wake up ZF thread. | |
| 5185 } | |
| 5186 | |
| 5187 void G1CollectedHeap::set_unclean_regions_coming(bool b) { | |
| 5188 MutexLockerEx x(Cleanup_mon); | |
| 5189 set_unclean_regions_coming_locked(b); | |
| 5190 } | |
| 5191 | |
| 5192 void G1CollectedHeap::set_unclean_regions_coming_locked(bool b) { | |
| 5193 assert(Cleanup_mon->owned_by_self(), "Precondition"); | |
| 5194 _unclean_regions_coming = b; | |
| 5195 // Wake up mutator threads that might be waiting for completeCleanup to | |
| 5196 // finish. | |
| 5197 if (!b) Cleanup_mon->notify_all(); | |
| 5198 } | |
| 5199 | |
| 5200 void G1CollectedHeap::wait_for_cleanup_complete() { | |
| 1973 | 5201 assert_not_at_safepoint(); |
| 342 | 5202 MutexLockerEx x(Cleanup_mon); |
| 5203 wait_for_cleanup_complete_locked(); | |
| 5204 } | |
| 5205 | |
| 5206 void G1CollectedHeap::wait_for_cleanup_complete_locked() { | |
| 5207 assert(Cleanup_mon->owned_by_self(), "precondition"); | |
| 5208 while (_unclean_regions_coming) { | |
| 5209 Cleanup_mon->wait(); | |
| 5210 } | |
| 5211 } | |
| 5212 | |
| 5213 void | |
| 5214 G1CollectedHeap::put_region_on_unclean_list_locked(HeapRegion* r) { | |
| 5215 assert(ZF_mon->owned_by_self(), "precondition."); | |
|
1545
cc387008223e
6921317: (partial) G1: assert(top() == bottom() || zfs == Allocated,"Region must be empty, or we must be setting it to
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diff
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|
5216 #ifdef ASSERT |
|
cc387008223e
6921317: (partial) G1: assert(top() == bottom() || zfs == Allocated,"Region must be empty, or we must be setting it to
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1489
diff
changeset
|
5217 if (r->is_gc_alloc_region()) { |
|
cc387008223e
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diff
changeset
|
5218 ResourceMark rm; |
|
cc387008223e
6921317: (partial) G1: assert(top() == bottom() || zfs == Allocated,"Region must be empty, or we must be setting it to
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|
5219 stringStream region_str; |
|
cc387008223e
6921317: (partial) G1: assert(top() == bottom() || zfs == Allocated,"Region must be empty, or we must be setting it to
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diff
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|
5220 print_on(®ion_str); |
|
cc387008223e
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|
5221 assert(!r->is_gc_alloc_region(), err_msg("Unexpected GC allocation region: %s", |
|
cc387008223e
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|
5222 region_str.as_string())); |
|
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|
5223 } |
|
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|
5224 #endif |
| 342 | 5225 _unclean_region_list.insert_before_head(r); |
| 5226 } | |
| 5227 | |
| 5228 void | |
| 5229 G1CollectedHeap::prepend_region_list_on_unclean_list(UncleanRegionList* list) { | |
| 5230 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5231 prepend_region_list_on_unclean_list_locked(list); | |
| 5232 if (should_zf()) ZF_mon->notify_all(); // Wake up ZF thread. | |
| 5233 } | |
| 5234 | |
| 5235 void | |
| 5236 G1CollectedHeap:: | |
| 5237 prepend_region_list_on_unclean_list_locked(UncleanRegionList* list) { | |
| 5238 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 5239 _unclean_region_list.prepend_list(list); | |
| 5240 } | |
| 5241 | |
| 5242 HeapRegion* G1CollectedHeap::pop_unclean_region_list_locked() { | |
| 5243 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 5244 HeapRegion* res = _unclean_region_list.pop(); | |
| 5245 if (res != NULL) { | |
| 5246 // Inform ZF thread that there's a new unclean head. | |
| 5247 if (_unclean_region_list.hd() != NULL && should_zf()) | |
| 5248 ZF_mon->notify_all(); | |
| 5249 } | |
| 5250 return res; | |
| 5251 } | |
| 5252 | |
| 5253 HeapRegion* G1CollectedHeap::peek_unclean_region_list_locked() { | |
| 5254 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 5255 return _unclean_region_list.hd(); | |
| 5256 } | |
| 5257 | |
| 5258 | |
| 5259 bool G1CollectedHeap::move_cleaned_region_to_free_list_locked() { | |
| 5260 assert(ZF_mon->owned_by_self(), "Precondition"); | |
| 5261 HeapRegion* r = peek_unclean_region_list_locked(); | |
| 5262 if (r != NULL && r->zero_fill_state() == HeapRegion::ZeroFilled) { | |
| 5263 // Result of below must be equal to "r", since we hold the lock. | |
| 5264 (void)pop_unclean_region_list_locked(); | |
| 5265 put_free_region_on_list_locked(r); | |
| 5266 return true; | |
| 5267 } else { | |
| 5268 return false; | |
| 5269 } | |
| 5270 } | |
| 5271 | |
| 5272 bool G1CollectedHeap::move_cleaned_region_to_free_list() { | |
| 5273 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5274 return move_cleaned_region_to_free_list_locked(); | |
| 5275 } | |
| 5276 | |
| 5277 | |
| 5278 void G1CollectedHeap::put_free_region_on_list_locked(HeapRegion* r) { | |
| 5279 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 5280 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 5281 assert(r->zero_fill_state() == HeapRegion::ZeroFilled, | |
| 5282 "Regions on free list must be zero filled"); | |
| 5283 assert(!r->isHumongous(), "Must not be humongous."); | |
| 5284 assert(r->is_empty(), "Better be empty"); | |
| 5285 assert(!r->is_on_free_list(), | |
| 5286 "Better not already be on free list"); | |
| 5287 assert(!r->is_on_unclean_list(), | |
| 5288 "Better not already be on unclean list"); | |
| 5289 r->set_on_free_list(true); | |
| 5290 r->set_next_on_free_list(_free_region_list); | |
| 5291 _free_region_list = r; | |
| 5292 _free_region_list_size++; | |
| 5293 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 5294 } | |
| 5295 | |
| 5296 void G1CollectedHeap::put_free_region_on_list(HeapRegion* r) { | |
| 5297 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5298 put_free_region_on_list_locked(r); | |
| 5299 } | |
| 5300 | |
| 5301 HeapRegion* G1CollectedHeap::pop_free_region_list_locked() { | |
| 5302 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 5303 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 5304 HeapRegion* res = _free_region_list; | |
| 5305 if (res != NULL) { | |
| 5306 _free_region_list = res->next_from_free_list(); | |
| 5307 _free_region_list_size--; | |
| 5308 res->set_on_free_list(false); | |
| 5309 res->set_next_on_free_list(NULL); | |
| 5310 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 5311 } | |
| 5312 return res; | |
| 5313 } | |
| 5314 | |
| 5315 | |
| 5316 HeapRegion* G1CollectedHeap::alloc_free_region_from_lists(bool zero_filled) { | |
| 5317 // By self, or on behalf of self. | |
| 5318 assert(Heap_lock->is_locked(), "Precondition"); | |
| 5319 HeapRegion* res = NULL; | |
| 5320 bool first = true; | |
| 5321 while (res == NULL) { | |
| 5322 if (zero_filled || !first) { | |
| 5323 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5324 res = pop_free_region_list_locked(); | |
| 5325 if (res != NULL) { | |
| 5326 assert(!res->zero_fill_is_allocated(), | |
| 5327 "No allocated regions on free list."); | |
| 5328 res->set_zero_fill_allocated(); | |
| 5329 } else if (!first) { | |
| 5330 break; // We tried both, time to return NULL. | |
| 5331 } | |
| 5332 } | |
| 5333 | |
| 5334 if (res == NULL) { | |
| 5335 res = alloc_region_from_unclean_list(zero_filled); | |
| 5336 } | |
| 5337 assert(res == NULL || | |
| 5338 !zero_filled || | |
| 5339 res->zero_fill_is_allocated(), | |
| 5340 "We must have allocated the region we're returning"); | |
| 5341 first = false; | |
| 5342 } | |
| 5343 return res; | |
| 5344 } | |
| 5345 | |
| 5346 void G1CollectedHeap::remove_allocated_regions_from_lists() { | |
| 5347 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5348 { | |
| 5349 HeapRegion* prev = NULL; | |
| 5350 HeapRegion* cur = _unclean_region_list.hd(); | |
| 5351 while (cur != NULL) { | |
| 5352 HeapRegion* next = cur->next_from_unclean_list(); | |
| 5353 if (cur->zero_fill_is_allocated()) { | |
| 5354 // Remove from the list. | |
| 5355 if (prev == NULL) { | |
| 5356 (void)_unclean_region_list.pop(); | |
| 5357 } else { | |
| 5358 _unclean_region_list.delete_after(prev); | |
| 5359 } | |
| 5360 cur->set_on_unclean_list(false); | |
| 5361 cur->set_next_on_unclean_list(NULL); | |
| 5362 } else { | |
| 5363 prev = cur; | |
| 5364 } | |
| 5365 cur = next; | |
| 5366 } | |
| 5367 assert(_unclean_region_list.sz() == unclean_region_list_length(), | |
| 5368 "Inv"); | |
| 5369 } | |
| 5370 | |
| 5371 { | |
| 5372 HeapRegion* prev = NULL; | |
| 5373 HeapRegion* cur = _free_region_list; | |
| 5374 while (cur != NULL) { | |
| 5375 HeapRegion* next = cur->next_from_free_list(); | |
| 5376 if (cur->zero_fill_is_allocated()) { | |
| 5377 // Remove from the list. | |
| 5378 if (prev == NULL) { | |
| 5379 _free_region_list = cur->next_from_free_list(); | |
| 5380 } else { | |
| 5381 prev->set_next_on_free_list(cur->next_from_free_list()); | |
| 5382 } | |
| 5383 cur->set_on_free_list(false); | |
| 5384 cur->set_next_on_free_list(NULL); | |
| 5385 _free_region_list_size--; | |
| 5386 } else { | |
| 5387 prev = cur; | |
| 5388 } | |
| 5389 cur = next; | |
| 5390 } | |
| 5391 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 5392 } | |
| 5393 } | |
| 5394 | |
| 5395 bool G1CollectedHeap::verify_region_lists() { | |
| 5396 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5397 return verify_region_lists_locked(); | |
| 5398 } | |
| 5399 | |
| 5400 bool G1CollectedHeap::verify_region_lists_locked() { | |
| 5401 HeapRegion* unclean = _unclean_region_list.hd(); | |
| 5402 while (unclean != NULL) { | |
| 5403 guarantee(unclean->is_on_unclean_list(), "Well, it is!"); | |
| 5404 guarantee(!unclean->is_on_free_list(), "Well, it shouldn't be!"); | |
| 5405 guarantee(unclean->zero_fill_state() != HeapRegion::Allocated, | |
| 5406 "Everything else is possible."); | |
| 5407 unclean = unclean->next_from_unclean_list(); | |
| 5408 } | |
| 5409 guarantee(_unclean_region_list.sz() == unclean_region_list_length(), "Inv"); | |
| 5410 | |
| 5411 HeapRegion* free_r = _free_region_list; | |
| 5412 while (free_r != NULL) { | |
| 5413 assert(free_r->is_on_free_list(), "Well, it is!"); | |
| 5414 assert(!free_r->is_on_unclean_list(), "Well, it shouldn't be!"); | |
| 5415 switch (free_r->zero_fill_state()) { | |
| 5416 case HeapRegion::NotZeroFilled: | |
| 5417 case HeapRegion::ZeroFilling: | |
| 5418 guarantee(false, "Should not be on free list."); | |
| 5419 break; | |
| 5420 default: | |
| 5421 // Everything else is possible. | |
| 5422 break; | |
| 5423 } | |
| 5424 free_r = free_r->next_from_free_list(); | |
| 5425 } | |
| 5426 guarantee(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 5427 // If we didn't do an assertion... | |
| 5428 return true; | |
| 5429 } | |
| 5430 | |
| 5431 size_t G1CollectedHeap::free_region_list_length() { | |
| 5432 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 5433 size_t len = 0; | |
| 5434 HeapRegion* cur = _free_region_list; | |
| 5435 while (cur != NULL) { | |
| 5436 len++; | |
| 5437 cur = cur->next_from_free_list(); | |
| 5438 } | |
| 5439 return len; | |
| 5440 } | |
| 5441 | |
| 5442 size_t G1CollectedHeap::unclean_region_list_length() { | |
| 5443 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 5444 return _unclean_region_list.length(); | |
| 5445 } | |
| 5446 | |
| 5447 size_t G1CollectedHeap::n_regions() { | |
| 5448 return _hrs->length(); | |
| 5449 } | |
| 5450 | |
| 5451 size_t G1CollectedHeap::max_regions() { | |
| 5452 return | |
| 5453 (size_t)align_size_up(g1_reserved_obj_bytes(), HeapRegion::GrainBytes) / | |
| 5454 HeapRegion::GrainBytes; | |
| 5455 } | |
| 5456 | |
| 5457 size_t G1CollectedHeap::free_regions() { | |
| 5458 /* Possibly-expensive assert. | |
| 5459 assert(_free_regions == count_free_regions(), | |
| 5460 "_free_regions is off."); | |
| 5461 */ | |
| 5462 return _free_regions; | |
| 5463 } | |
| 5464 | |
| 5465 bool G1CollectedHeap::should_zf() { | |
| 5466 return _free_region_list_size < (size_t) G1ConcZFMaxRegions; | |
| 5467 } | |
| 5468 | |
| 5469 class RegionCounter: public HeapRegionClosure { | |
| 5470 size_t _n; | |
| 5471 public: | |
| 5472 RegionCounter() : _n(0) {} | |
| 5473 bool doHeapRegion(HeapRegion* r) { | |
| 677 | 5474 if (r->is_empty()) { |
| 342 | 5475 assert(!r->isHumongous(), "H regions should not be empty."); |
| 5476 _n++; | |
| 5477 } | |
| 5478 return false; | |
| 5479 } | |
| 5480 int res() { return (int) _n; } | |
| 5481 }; | |
| 5482 | |
| 5483 size_t G1CollectedHeap::count_free_regions() { | |
| 5484 RegionCounter rc; | |
| 5485 heap_region_iterate(&rc); | |
| 5486 size_t n = rc.res(); | |
| 5487 if (_cur_alloc_region != NULL && _cur_alloc_region->is_empty()) | |
| 5488 n--; | |
| 5489 return n; | |
| 5490 } | |
| 5491 | |
| 5492 size_t G1CollectedHeap::count_free_regions_list() { | |
| 5493 size_t n = 0; | |
| 5494 size_t o = 0; | |
| 5495 ZF_mon->lock_without_safepoint_check(); | |
| 5496 HeapRegion* cur = _free_region_list; | |
| 5497 while (cur != NULL) { | |
| 5498 cur = cur->next_from_free_list(); | |
| 5499 n++; | |
| 5500 } | |
| 5501 size_t m = unclean_region_list_length(); | |
| 5502 ZF_mon->unlock(); | |
| 5503 return n + m; | |
| 5504 } | |
| 5505 | |
| 5506 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
| 5507 assert(heap_lock_held_for_gc(), | |
| 5508 "the heap lock should already be held by or for this thread"); | |
| 5509 _young_list->push_region(hr); | |
| 5510 g1_policy()->set_region_short_lived(hr); | |
| 5511 } | |
| 5512 | |
| 5513 class NoYoungRegionsClosure: public HeapRegionClosure { | |
| 5514 private: | |
| 5515 bool _success; | |
| 5516 public: | |
| 5517 NoYoungRegionsClosure() : _success(true) { } | |
| 5518 bool doHeapRegion(HeapRegion* r) { | |
| 5519 if (r->is_young()) { | |
| 5520 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
| 5521 r->bottom(), r->end()); | |
| 5522 _success = false; | |
| 5523 } | |
| 5524 return false; | |
| 5525 } | |
| 5526 bool success() { return _success; } | |
| 5527 }; | |
| 5528 | |
|
1394
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johnc
parents:
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diff
changeset
|
5529 bool G1CollectedHeap::check_young_list_empty(bool check_heap, bool check_sample) { |
|
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diff
changeset
|
5530 bool ret = _young_list->check_list_empty(check_sample); |
|
1316cec51b4d
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johnc
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diff
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|
5531 |
|
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|
5532 if (check_heap) { |
| 342 | 5533 NoYoungRegionsClosure closure; |
| 5534 heap_region_iterate(&closure); | |
| 5535 ret = ret && closure.success(); | |
| 5536 } | |
| 5537 | |
| 5538 return ret; | |
| 5539 } | |
| 5540 | |
| 5541 void G1CollectedHeap::empty_young_list() { | |
| 5542 assert(heap_lock_held_for_gc(), | |
| 5543 "the heap lock should already be held by or for this thread"); | |
| 5544 assert(g1_policy()->in_young_gc_mode(), "should be in young GC mode"); | |
| 5545 | |
| 5546 _young_list->empty_list(); | |
| 5547 } | |
| 5548 | |
| 5549 bool G1CollectedHeap::all_alloc_regions_no_allocs_since_save_marks() { | |
| 5550 bool no_allocs = true; | |
| 5551 for (int ap = 0; ap < GCAllocPurposeCount && no_allocs; ++ap) { | |
| 5552 HeapRegion* r = _gc_alloc_regions[ap]; | |
| 5553 no_allocs = r == NULL || r->saved_mark_at_top(); | |
| 5554 } | |
| 5555 return no_allocs; | |
| 5556 } | |
| 5557 | |
| 545 | 5558 void G1CollectedHeap::retire_all_alloc_regions() { |
| 342 | 5559 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
| 5560 HeapRegion* r = _gc_alloc_regions[ap]; | |
| 5561 if (r != NULL) { | |
| 5562 // Check for aliases. | |
| 5563 bool has_processed_alias = false; | |
| 5564 for (int i = 0; i < ap; ++i) { | |
| 5565 if (_gc_alloc_regions[i] == r) { | |
| 5566 has_processed_alias = true; | |
| 5567 break; | |
| 5568 } | |
| 5569 } | |
| 5570 if (!has_processed_alias) { | |
| 545 | 5571 retire_alloc_region(r, false /* par */); |
| 342 | 5572 } |
| 5573 } | |
| 5574 } | |
| 5575 } | |
| 5576 | |
| 5577 | |
| 5578 // Done at the start of full GC. | |
| 5579 void G1CollectedHeap::tear_down_region_lists() { | |
| 5580 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5581 while (pop_unclean_region_list_locked() != NULL) ; | |
| 5582 assert(_unclean_region_list.hd() == NULL && _unclean_region_list.sz() == 0, | |
|
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5583 "Postconditions of loop."); |
| 342 | 5584 while (pop_free_region_list_locked() != NULL) ; |
| 5585 assert(_free_region_list == NULL, "Postcondition of loop."); | |
| 5586 if (_free_region_list_size != 0) { | |
| 5587 gclog_or_tty->print_cr("Size is %d.", _free_region_list_size); | |
|
838
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|
5588 print_on(gclog_or_tty, true /* extended */); |
| 342 | 5589 } |
| 5590 assert(_free_region_list_size == 0, "Postconditions of loop."); | |
| 5591 } | |
| 5592 | |
| 5593 | |
| 5594 class RegionResetter: public HeapRegionClosure { | |
| 5595 G1CollectedHeap* _g1; | |
| 5596 int _n; | |
| 5597 public: | |
| 5598 RegionResetter() : _g1(G1CollectedHeap::heap()), _n(0) {} | |
| 5599 bool doHeapRegion(HeapRegion* r) { | |
| 5600 if (r->continuesHumongous()) return false; | |
| 5601 if (r->top() > r->bottom()) { | |
| 5602 if (r->top() < r->end()) { | |
| 5603 Copy::fill_to_words(r->top(), | |
| 5604 pointer_delta(r->end(), r->top())); | |
| 5605 } | |
| 5606 r->set_zero_fill_allocated(); | |
| 5607 } else { | |
| 5608 assert(r->is_empty(), "tautology"); | |
| 677 | 5609 _n++; |
| 5610 switch (r->zero_fill_state()) { | |
| 342 | 5611 case HeapRegion::NotZeroFilled: |
| 5612 case HeapRegion::ZeroFilling: | |
| 5613 _g1->put_region_on_unclean_list_locked(r); | |
| 5614 break; | |
| 5615 case HeapRegion::Allocated: | |
| 5616 r->set_zero_fill_complete(); | |
| 5617 // no break; go on to put on free list. | |
| 5618 case HeapRegion::ZeroFilled: | |
| 5619 _g1->put_free_region_on_list_locked(r); | |
| 5620 break; | |
| 5621 } | |
| 5622 } | |
| 5623 return false; | |
| 5624 } | |
| 5625 | |
| 5626 int getFreeRegionCount() {return _n;} | |
| 5627 }; | |
| 5628 | |
| 5629 // Done at the end of full GC. | |
| 5630 void G1CollectedHeap::rebuild_region_lists() { | |
| 5631 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5632 // This needs to go at the end of the full GC. | |
| 5633 RegionResetter rs; | |
| 5634 heap_region_iterate(&rs); | |
| 5635 _free_regions = rs.getFreeRegionCount(); | |
| 5636 // Tell the ZF thread it may have work to do. | |
| 5637 if (should_zf()) ZF_mon->notify_all(); | |
| 5638 } | |
| 5639 | |
| 5640 class UsedRegionsNeedZeroFillSetter: public HeapRegionClosure { | |
| 5641 G1CollectedHeap* _g1; | |
| 5642 int _n; | |
| 5643 public: | |
| 5644 UsedRegionsNeedZeroFillSetter() : _g1(G1CollectedHeap::heap()), _n(0) {} | |
| 5645 bool doHeapRegion(HeapRegion* r) { | |
| 5646 if (r->continuesHumongous()) return false; | |
| 5647 if (r->top() > r->bottom()) { | |
| 5648 // There are assertions in "set_zero_fill_needed()" below that | |
| 5649 // require top() == bottom(), so this is technically illegal. | |
| 5650 // We'll skirt the law here, by making that true temporarily. | |
| 5651 DEBUG_ONLY(HeapWord* save_top = r->top(); | |
| 5652 r->set_top(r->bottom())); | |
| 5653 r->set_zero_fill_needed(); | |
| 5654 DEBUG_ONLY(r->set_top(save_top)); | |
| 5655 } | |
| 5656 return false; | |
| 5657 } | |
| 5658 }; | |
| 5659 | |
| 5660 // Done at the start of full GC. | |
| 5661 void G1CollectedHeap::set_used_regions_to_need_zero_fill() { | |
| 5662 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5663 // This needs to go at the end of the full GC. | |
| 5664 UsedRegionsNeedZeroFillSetter rs; | |
| 5665 heap_region_iterate(&rs); | |
| 5666 } | |
| 5667 | |
| 5668 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
| 5669 _refine_cte_cl->set_concurrent(concurrent); | |
| 5670 } | |
| 5671 | |
| 5672 #ifndef PRODUCT | |
| 5673 | |
| 5674 class PrintHeapRegionClosure: public HeapRegionClosure { | |
| 5675 public: | |
| 5676 bool doHeapRegion(HeapRegion *r) { | |
| 5677 gclog_or_tty->print("Region: "PTR_FORMAT":", r); | |
| 5678 if (r != NULL) { | |
| 5679 if (r->is_on_free_list()) | |
| 5680 gclog_or_tty->print("Free "); | |
| 5681 if (r->is_young()) | |
| 5682 gclog_or_tty->print("Young "); | |
| 5683 if (r->isHumongous()) | |
| 5684 gclog_or_tty->print("Is Humongous "); | |
| 5685 r->print(); | |
| 5686 } | |
| 5687 return false; | |
| 5688 } | |
| 5689 }; | |
| 5690 | |
| 5691 class SortHeapRegionClosure : public HeapRegionClosure { | |
| 5692 size_t young_regions,free_regions, unclean_regions; | |
| 5693 size_t hum_regions, count; | |
| 5694 size_t unaccounted, cur_unclean, cur_alloc; | |
| 5695 size_t total_free; | |
| 5696 HeapRegion* cur; | |
| 5697 public: | |
| 5698 SortHeapRegionClosure(HeapRegion *_cur) : cur(_cur), young_regions(0), | |
| 5699 free_regions(0), unclean_regions(0), | |
| 5700 hum_regions(0), | |
| 5701 count(0), unaccounted(0), | |
| 5702 cur_alloc(0), total_free(0) | |
| 5703 {} | |
| 5704 bool doHeapRegion(HeapRegion *r) { | |
| 5705 count++; | |
| 5706 if (r->is_on_free_list()) free_regions++; | |
| 5707 else if (r->is_on_unclean_list()) unclean_regions++; | |
| 5708 else if (r->isHumongous()) hum_regions++; | |
| 5709 else if (r->is_young()) young_regions++; | |
| 5710 else if (r == cur) cur_alloc++; | |
| 5711 else unaccounted++; | |
| 5712 return false; | |
| 5713 } | |
| 5714 void print() { | |
| 5715 total_free = free_regions + unclean_regions; | |
| 5716 gclog_or_tty->print("%d regions\n", count); | |
| 5717 gclog_or_tty->print("%d free: free_list = %d unclean = %d\n", | |
| 5718 total_free, free_regions, unclean_regions); | |
| 5719 gclog_or_tty->print("%d humongous %d young\n", | |
| 5720 hum_regions, young_regions); | |
| 5721 gclog_or_tty->print("%d cur_alloc\n", cur_alloc); | |
| 5722 gclog_or_tty->print("UHOH unaccounted = %d\n", unaccounted); | |
| 5723 } | |
| 5724 }; | |
| 5725 | |
| 5726 void G1CollectedHeap::print_region_counts() { | |
| 5727 SortHeapRegionClosure sc(_cur_alloc_region); | |
| 5728 PrintHeapRegionClosure cl; | |
| 5729 heap_region_iterate(&cl); | |
| 5730 heap_region_iterate(&sc); | |
| 5731 sc.print(); | |
| 5732 print_region_accounting_info(); | |
| 5733 }; | |
| 5734 | |
| 5735 bool G1CollectedHeap::regions_accounted_for() { | |
| 5736 // TODO: regions accounting for young/survivor/tenured | |
| 5737 return true; | |
| 5738 } | |
| 5739 | |
| 5740 bool G1CollectedHeap::print_region_accounting_info() { | |
| 5741 gclog_or_tty->print_cr("Free regions: %d (count: %d count list %d) (clean: %d unclean: %d).", | |
| 5742 free_regions(), | |
| 5743 count_free_regions(), count_free_regions_list(), | |
| 5744 _free_region_list_size, _unclean_region_list.sz()); | |
| 5745 gclog_or_tty->print_cr("cur_alloc: %d.", | |
| 5746 (_cur_alloc_region == NULL ? 0 : 1)); | |
| 5747 gclog_or_tty->print_cr("H regions: %d.", _num_humongous_regions); | |
| 5748 | |
| 5749 // TODO: check regions accounting for young/survivor/tenured | |
| 5750 return true; | |
| 5751 } | |
| 5752 | |
| 5753 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
| 5754 HeapRegion* hr = heap_region_containing(p); | |
| 5755 if (hr == NULL) { | |
| 5756 return is_in_permanent(p); | |
| 5757 } else { | |
| 5758 return hr->is_in(p); | |
| 5759 } | |
| 5760 } | |
| 941 | 5761 #endif // !PRODUCT |
| 342 | 5762 |
| 5763 void G1CollectedHeap::g1_unimplemented() { | |
| 5764 // Unimplemented(); | |
| 5765 } |