Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 1833:8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
Summary: Associate number of GC workers with the workgang as opposed to the task.
Reviewed-by: johnc, ysr
| author | jmasa |
|---|---|
| date | Mon, 20 Sep 2010 14:38:38 -0700 |
| parents | 8e5955ddf8e4 |
| children | 4e0094bc41fa |
| 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 | |
| 25 #include "incls/_precompiled.incl" | |
| 26 #include "incls/_g1CollectedHeap.cpp.incl" | |
| 27 | |
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28 size_t G1CollectedHeap::_humongous_object_threshold_in_words = 0; |
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29 |
| 342 | 30 // turn it on so that the contents of the young list (scan-only / |
| 31 // to-be-collected) are printed at "strategic" points before / during | |
| 32 // / after the collection --- this is useful for debugging | |
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33 #define YOUNG_LIST_VERBOSE 0 |
| 342 | 34 // CURRENT STATUS |
| 35 // This file is under construction. Search for "FIXME". | |
| 36 | |
| 37 // INVARIANTS/NOTES | |
| 38 // | |
| 39 // All allocation activity covered by the G1CollectedHeap interface is | |
| 40 // serialized by acquiring the HeapLock. This happens in | |
| 41 // mem_allocate_work, which all such allocation functions call. | |
| 42 // (Note that this does not apply to TLAB allocation, which is not part | |
| 43 // of this interface: it is done by clients of this interface.) | |
| 44 | |
| 45 // Local to this file. | |
| 46 | |
| 47 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
| 48 SuspendibleThreadSet* _sts; | |
| 49 G1RemSet* _g1rs; | |
| 50 ConcurrentG1Refine* _cg1r; | |
| 51 bool _concurrent; | |
| 52 public: | |
| 53 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
| 54 G1RemSet* g1rs, | |
| 55 ConcurrentG1Refine* cg1r) : | |
| 56 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
| 57 {} | |
| 58 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 1705 | 59 bool oops_into_cset = _g1rs->concurrentRefineOneCard(card_ptr, worker_i, false); |
| 60 // This path is executed by the concurrent refine or mutator threads, | |
| 61 // concurrently, and so we do not care if card_ptr contains references | |
| 62 // that point into the collection set. | |
| 63 assert(!oops_into_cset, "should be"); | |
| 64 | |
| 342 | 65 if (_concurrent && _sts->should_yield()) { |
| 66 // Caller will actually yield. | |
| 67 return false; | |
| 68 } | |
| 69 // Otherwise, we finished successfully; return true. | |
| 70 return true; | |
| 71 } | |
| 72 void set_concurrent(bool b) { _concurrent = b; } | |
| 73 }; | |
| 74 | |
| 75 | |
| 76 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 77 int _calls; | |
| 78 G1CollectedHeap* _g1h; | |
| 79 CardTableModRefBS* _ctbs; | |
| 80 int _histo[256]; | |
| 81 public: | |
| 82 ClearLoggedCardTableEntryClosure() : | |
| 83 _calls(0) | |
| 84 { | |
| 85 _g1h = G1CollectedHeap::heap(); | |
| 86 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 87 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
| 88 } | |
| 89 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 90 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 91 _calls++; | |
| 92 unsigned char* ujb = (unsigned char*)card_ptr; | |
| 93 int ind = (int)(*ujb); | |
| 94 _histo[ind]++; | |
| 95 *card_ptr = -1; | |
| 96 } | |
| 97 return true; | |
| 98 } | |
| 99 int calls() { return _calls; } | |
| 100 void print_histo() { | |
| 101 gclog_or_tty->print_cr("Card table value histogram:"); | |
| 102 for (int i = 0; i < 256; i++) { | |
| 103 if (_histo[i] != 0) { | |
| 104 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
| 105 } | |
| 106 } | |
| 107 } | |
| 108 }; | |
| 109 | |
| 110 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
| 111 int _calls; | |
| 112 G1CollectedHeap* _g1h; | |
| 113 CardTableModRefBS* _ctbs; | |
| 114 public: | |
| 115 RedirtyLoggedCardTableEntryClosure() : | |
| 116 _calls(0) | |
| 117 { | |
| 118 _g1h = G1CollectedHeap::heap(); | |
| 119 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
| 120 } | |
| 121 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 122 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
| 123 _calls++; | |
| 124 *card_ptr = 0; | |
| 125 } | |
| 126 return true; | |
| 127 } | |
| 128 int calls() { return _calls; } | |
| 129 }; | |
| 130 | |
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131 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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132 public: |
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133 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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134 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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135 return true; |
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136 } |
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137 }; |
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138 |
| 342 | 139 YoungList::YoungList(G1CollectedHeap* g1h) |
| 140 : _g1h(g1h), _head(NULL), | |
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141 _length(0), |
| 342 | 142 _last_sampled_rs_lengths(0), |
| 545 | 143 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) |
| 342 | 144 { |
| 145 guarantee( check_list_empty(false), "just making sure..." ); | |
| 146 } | |
| 147 | |
| 148 void YoungList::push_region(HeapRegion *hr) { | |
| 149 assert(!hr->is_young(), "should not already be young"); | |
| 150 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
| 151 | |
| 152 hr->set_next_young_region(_head); | |
| 153 _head = hr; | |
| 154 | |
| 155 hr->set_young(); | |
| 156 double yg_surv_rate = _g1h->g1_policy()->predict_yg_surv_rate((int)_length); | |
| 157 ++_length; | |
| 158 } | |
| 159 | |
| 160 void YoungList::add_survivor_region(HeapRegion* hr) { | |
| 545 | 161 assert(hr->is_survivor(), "should be flagged as survivor region"); |
| 342 | 162 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
| 163 | |
| 164 hr->set_next_young_region(_survivor_head); | |
| 165 if (_survivor_head == NULL) { | |
| 545 | 166 _survivor_tail = hr; |
| 342 | 167 } |
| 168 _survivor_head = hr; | |
| 169 | |
| 170 ++_survivor_length; | |
| 171 } | |
| 172 | |
| 173 void YoungList::empty_list(HeapRegion* list) { | |
| 174 while (list != NULL) { | |
| 175 HeapRegion* next = list->get_next_young_region(); | |
| 176 list->set_next_young_region(NULL); | |
| 177 list->uninstall_surv_rate_group(); | |
| 178 list->set_not_young(); | |
| 179 list = next; | |
| 180 } | |
| 181 } | |
| 182 | |
| 183 void YoungList::empty_list() { | |
| 184 assert(check_list_well_formed(), "young list should be well formed"); | |
| 185 | |
| 186 empty_list(_head); | |
| 187 _head = NULL; | |
| 188 _length = 0; | |
| 189 | |
| 190 empty_list(_survivor_head); | |
| 191 _survivor_head = NULL; | |
| 545 | 192 _survivor_tail = NULL; |
| 342 | 193 _survivor_length = 0; |
| 194 | |
| 195 _last_sampled_rs_lengths = 0; | |
| 196 | |
| 197 assert(check_list_empty(false), "just making sure..."); | |
| 198 } | |
| 199 | |
| 200 bool YoungList::check_list_well_formed() { | |
| 201 bool ret = true; | |
| 202 | |
| 203 size_t length = 0; | |
| 204 HeapRegion* curr = _head; | |
| 205 HeapRegion* last = NULL; | |
| 206 while (curr != NULL) { | |
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207 if (!curr->is_young()) { |
| 342 | 208 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " |
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209 "incorrectly tagged (y: %d, surv: %d)", |
| 342 | 210 curr->bottom(), curr->end(), |
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211 curr->is_young(), curr->is_survivor()); |
| 342 | 212 ret = false; |
| 213 } | |
| 214 ++length; | |
| 215 last = curr; | |
| 216 curr = curr->get_next_young_region(); | |
| 217 } | |
| 218 ret = ret && (length == _length); | |
| 219 | |
| 220 if (!ret) { | |
| 221 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
| 222 gclog_or_tty->print_cr("### list has %d entries, _length is %d", | |
| 223 length, _length); | |
| 224 } | |
| 225 | |
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226 return ret; |
| 342 | 227 } |
| 228 | |
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229 bool YoungList::check_list_empty(bool check_sample) { |
| 342 | 230 bool ret = true; |
| 231 | |
| 232 if (_length != 0) { | |
| 233 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %d", | |
| 234 _length); | |
| 235 ret = false; | |
| 236 } | |
| 237 if (check_sample && _last_sampled_rs_lengths != 0) { | |
| 238 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
| 239 ret = false; | |
| 240 } | |
| 241 if (_head != NULL) { | |
| 242 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
| 243 ret = false; | |
| 244 } | |
| 245 if (!ret) { | |
| 246 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
| 247 } | |
| 248 | |
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249 return ret; |
| 342 | 250 } |
| 251 | |
| 252 void | |
| 253 YoungList::rs_length_sampling_init() { | |
| 254 _sampled_rs_lengths = 0; | |
| 255 _curr = _head; | |
| 256 } | |
| 257 | |
| 258 bool | |
| 259 YoungList::rs_length_sampling_more() { | |
| 260 return _curr != NULL; | |
| 261 } | |
| 262 | |
| 263 void | |
| 264 YoungList::rs_length_sampling_next() { | |
| 265 assert( _curr != NULL, "invariant" ); | |
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266 size_t rs_length = _curr->rem_set()->occupied(); |
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267 |
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268 _sampled_rs_lengths += rs_length; |
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269 |
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270 // The current region may not yet have been added to the |
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271 // incremental collection set (it gets added when it is |
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272 // retired as the current allocation region). |
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273 if (_curr->in_collection_set()) { |
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274 // Update the collection set policy information for this region |
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275 _g1h->g1_policy()->update_incremental_cset_info(_curr, rs_length); |
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276 } |
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277 |
| 342 | 278 _curr = _curr->get_next_young_region(); |
| 279 if (_curr == NULL) { | |
| 280 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
| 281 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
| 282 } | |
| 283 } | |
| 284 | |
| 285 void | |
| 286 YoungList::reset_auxilary_lists() { | |
| 287 guarantee( is_empty(), "young list should be empty" ); | |
| 288 assert(check_list_well_formed(), "young list should be well formed"); | |
| 289 | |
| 290 // Add survivor regions to SurvRateGroup. | |
| 291 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
| 545 | 292 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
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293 |
| 342 | 294 for (HeapRegion* curr = _survivor_head; |
| 295 curr != NULL; | |
| 296 curr = curr->get_next_young_region()) { | |
| 297 _g1h->g1_policy()->set_region_survivors(curr); | |
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298 |
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299 // The region is a non-empty survivor so let's add it to |
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300 // the incremental collection set for the next evacuation |
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301 // pause. |
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302 _g1h->g1_policy()->add_region_to_incremental_cset_rhs(curr); |
| 342 | 303 } |
| 304 _g1h->g1_policy()->note_stop_adding_survivor_regions(); | |
| 305 | |
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306 _head = _survivor_head; |
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307 _length = _survivor_length; |
| 342 | 308 if (_survivor_head != NULL) { |
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309 assert(_survivor_tail != NULL, "cause it shouldn't be"); |
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310 assert(_survivor_length > 0, "invariant"); |
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311 _survivor_tail->set_next_young_region(NULL); |
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312 } |
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313 |
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314 // Don't clear the survivor list handles until the start of |
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315 // the next evacuation pause - we need it in order to re-tag |
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316 // the survivor regions from this evacuation pause as 'young' |
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317 // at the start of the next. |
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318 |
| 545 | 319 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
| 342 | 320 |
| 321 assert(check_list_well_formed(), "young list should be well formed"); | |
| 322 } | |
| 323 | |
| 324 void YoungList::print() { | |
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325 HeapRegion* lists[] = {_head, _survivor_head}; |
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326 const char* names[] = {"YOUNG", "SURVIVOR"}; |
| 342 | 327 |
| 328 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
| 329 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
| 330 HeapRegion *curr = lists[list]; | |
| 331 if (curr == NULL) | |
| 332 gclog_or_tty->print_cr(" empty"); | |
| 333 while (curr != NULL) { | |
| 334 gclog_or_tty->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " | |
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335 "age: %4d, y: %d, surv: %d", |
| 342 | 336 curr->bottom(), curr->end(), |
| 337 curr->top(), | |
| 338 curr->prev_top_at_mark_start(), | |
| 339 curr->next_top_at_mark_start(), | |
| 340 curr->top_at_conc_mark_count(), | |
| 341 curr->age_in_surv_rate_group_cond(), | |
| 342 curr->is_young(), | |
| 343 curr->is_survivor()); | |
| 344 curr = curr->get_next_young_region(); | |
| 345 } | |
| 346 } | |
| 347 | |
| 348 gclog_or_tty->print_cr(""); | |
| 349 } | |
| 350 | |
|
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351 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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352 { |
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353 // Claim the right to put the region on the dirty cards region list |
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354 // by installing a self pointer. |
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355 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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356 if (next == NULL) { |
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357 HeapRegion* res = (HeapRegion*) |
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358 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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359 NULL); |
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360 if (res == NULL) { |
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361 HeapRegion* head; |
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362 do { |
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363 // Put the region to the dirty cards region list. |
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364 head = _dirty_cards_region_list; |
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365 next = (HeapRegion*) |
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366 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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367 if (next == head) { |
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368 assert(hr->get_next_dirty_cards_region() == hr, |
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369 "hr->get_next_dirty_cards_region() != hr"); |
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370 if (next == NULL) { |
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371 // The last region in the list points to itself. |
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372 hr->set_next_dirty_cards_region(hr); |
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373 } else { |
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374 hr->set_next_dirty_cards_region(next); |
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375 } |
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376 } |
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377 } while (next != head); |
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378 } |
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379 } |
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380 } |
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381 |
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382 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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383 { |
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384 HeapRegion* head; |
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385 HeapRegion* hr; |
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386 do { |
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387 head = _dirty_cards_region_list; |
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388 if (head == NULL) { |
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389 return NULL; |
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390 } |
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391 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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392 if (head == new_head) { |
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393 // The last region. |
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394 new_head = NULL; |
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395 } |
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396 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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397 head); |
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398 } while (hr != head); |
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399 assert(hr != NULL, "invariant"); |
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400 hr->set_next_dirty_cards_region(NULL); |
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401 return hr; |
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402 } |
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403 |
| 342 | 404 void G1CollectedHeap::stop_conc_gc_threads() { |
| 794 | 405 _cg1r->stop(); |
| 342 | 406 _czft->stop(); |
| 407 _cmThread->stop(); | |
| 408 } | |
| 409 | |
| 410 | |
| 411 void G1CollectedHeap::check_ct_logs_at_safepoint() { | |
| 412 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 413 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
| 414 | |
| 415 // Count the dirty cards at the start. | |
| 416 CountNonCleanMemRegionClosure count1(this); | |
| 417 ct_bs->mod_card_iterate(&count1); | |
| 418 int orig_count = count1.n(); | |
| 419 | |
| 420 // First clear the logged cards. | |
| 421 ClearLoggedCardTableEntryClosure clear; | |
| 422 dcqs.set_closure(&clear); | |
| 423 dcqs.apply_closure_to_all_completed_buffers(); | |
| 424 dcqs.iterate_closure_all_threads(false); | |
| 425 clear.print_histo(); | |
| 426 | |
| 427 // Now ensure that there's no dirty cards. | |
| 428 CountNonCleanMemRegionClosure count2(this); | |
| 429 ct_bs->mod_card_iterate(&count2); | |
| 430 if (count2.n() != 0) { | |
| 431 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
| 432 count2.n(), orig_count); | |
| 433 } | |
| 434 guarantee(count2.n() == 0, "Card table should be clean."); | |
| 435 | |
| 436 RedirtyLoggedCardTableEntryClosure redirty; | |
| 437 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
| 438 dcqs.apply_closure_to_all_completed_buffers(); | |
| 439 dcqs.iterate_closure_all_threads(false); | |
| 440 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
| 441 clear.calls(), orig_count); | |
| 442 guarantee(redirty.calls() == clear.calls(), | |
| 443 "Or else mechanism is broken."); | |
| 444 | |
| 445 CountNonCleanMemRegionClosure count3(this); | |
| 446 ct_bs->mod_card_iterate(&count3); | |
| 447 if (count3.n() != orig_count) { | |
| 448 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
| 449 orig_count, count3.n()); | |
| 450 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
| 451 } | |
| 452 | |
| 453 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 454 } | |
| 455 | |
| 456 // Private class members. | |
| 457 | |
| 458 G1CollectedHeap* G1CollectedHeap::_g1h; | |
| 459 | |
| 460 // Private methods. | |
| 461 | |
| 462 // Finds a HeapRegion that can be used to allocate a given size of block. | |
| 463 | |
| 464 | |
| 465 HeapRegion* G1CollectedHeap::newAllocRegion_work(size_t word_size, | |
| 466 bool do_expand, | |
| 467 bool zero_filled) { | |
| 468 ConcurrentZFThread::note_region_alloc(); | |
| 469 HeapRegion* res = alloc_free_region_from_lists(zero_filled); | |
| 470 if (res == NULL && do_expand) { | |
| 471 expand(word_size * HeapWordSize); | |
| 472 res = alloc_free_region_from_lists(zero_filled); | |
| 473 assert(res == NULL || | |
| 474 (!res->isHumongous() && | |
| 475 (!zero_filled || | |
| 476 res->zero_fill_state() == HeapRegion::Allocated)), | |
| 477 "Alloc Regions must be zero filled (and non-H)"); | |
| 478 } | |
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479 if (res != NULL) { |
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480 if (res->is_empty()) { |
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481 _free_regions--; |
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482 } |
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483 assert(!res->isHumongous() && |
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484 (!zero_filled || res->zero_fill_state() == HeapRegion::Allocated), |
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485 err_msg("Non-young alloc Regions must be zero filled (and non-H):" |
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486 " res->isHumongous()=%d, zero_filled=%d, res->zero_fill_state()=%d", |
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487 res->isHumongous(), zero_filled, res->zero_fill_state())); |
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488 assert(!res->is_on_unclean_list(), |
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489 "Alloc Regions must not be on the unclean list"); |
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490 if (G1PrintHeapRegions) { |
| 342 | 491 gclog_or_tty->print_cr("new alloc region %d:["PTR_FORMAT", "PTR_FORMAT"], " |
| 492 "top "PTR_FORMAT, | |
| 493 res->hrs_index(), res->bottom(), res->end(), res->top()); | |
| 494 } | |
| 495 } | |
| 496 return res; | |
| 497 } | |
| 498 | |
| 499 HeapRegion* G1CollectedHeap::newAllocRegionWithExpansion(int purpose, | |
| 500 size_t word_size, | |
| 501 bool zero_filled) { | |
| 502 HeapRegion* alloc_region = NULL; | |
| 503 if (_gc_alloc_region_counts[purpose] < g1_policy()->max_regions(purpose)) { | |
| 504 alloc_region = newAllocRegion_work(word_size, true, zero_filled); | |
| 505 if (purpose == GCAllocForSurvived && alloc_region != NULL) { | |
| 545 | 506 alloc_region->set_survivor(); |
| 342 | 507 } |
| 508 ++_gc_alloc_region_counts[purpose]; | |
| 509 } else { | |
| 510 g1_policy()->note_alloc_region_limit_reached(purpose); | |
| 511 } | |
| 512 return alloc_region; | |
| 513 } | |
| 514 | |
| 515 // If could fit into free regions w/o expansion, try. | |
| 516 // Otherwise, if can expand, do so. | |
| 517 // Otherwise, if using ex regions might help, try with ex given back. | |
| 518 HeapWord* G1CollectedHeap::humongousObjAllocate(size_t word_size) { | |
| 519 assert(regions_accounted_for(), "Region leakage!"); | |
| 520 | |
| 521 // We can't allocate H regions while cleanupComplete is running, since | |
| 522 // some of the regions we find to be empty might not yet be added to the | |
| 523 // unclean list. (If we're already at a safepoint, this call is | |
| 524 // unnecessary, not to mention wrong.) | |
| 525 if (!SafepointSynchronize::is_at_safepoint()) | |
| 526 wait_for_cleanup_complete(); | |
| 527 | |
| 528 size_t num_regions = | |
| 529 round_to(word_size, HeapRegion::GrainWords) / HeapRegion::GrainWords; | |
| 530 | |
| 531 // Special case if < one region??? | |
| 532 | |
| 533 // Remember the ft size. | |
| 534 size_t x_size = expansion_regions(); | |
| 535 | |
| 536 HeapWord* res = NULL; | |
| 537 bool eliminated_allocated_from_lists = false; | |
| 538 | |
| 539 // Can the allocation potentially fit in the free regions? | |
| 540 if (free_regions() >= num_regions) { | |
| 541 res = _hrs->obj_allocate(word_size); | |
| 542 } | |
| 543 if (res == NULL) { | |
| 544 // Try expansion. | |
| 545 size_t fs = _hrs->free_suffix(); | |
| 546 if (fs + x_size >= num_regions) { | |
| 547 expand((num_regions - fs) * HeapRegion::GrainBytes); | |
| 548 res = _hrs->obj_allocate(word_size); | |
| 549 assert(res != NULL, "This should have worked."); | |
| 550 } else { | |
| 551 // Expansion won't help. Are there enough free regions if we get rid | |
| 552 // of reservations? | |
| 553 size_t avail = free_regions(); | |
| 554 if (avail >= num_regions) { | |
| 555 res = _hrs->obj_allocate(word_size); | |
| 556 if (res != NULL) { | |
| 557 remove_allocated_regions_from_lists(); | |
| 558 eliminated_allocated_from_lists = true; | |
| 559 } | |
| 560 } | |
| 561 } | |
| 562 } | |
| 563 if (res != NULL) { | |
| 564 // Increment by the number of regions allocated. | |
| 565 // FIXME: Assumes regions all of size GrainBytes. | |
| 566 #ifndef PRODUCT | |
| 567 mr_bs()->verify_clean_region(MemRegion(res, res + num_regions * | |
| 568 HeapRegion::GrainWords)); | |
| 569 #endif | |
| 570 if (!eliminated_allocated_from_lists) | |
| 571 remove_allocated_regions_from_lists(); | |
| 572 _summary_bytes_used += word_size * HeapWordSize; | |
| 573 _free_regions -= num_regions; | |
| 574 _num_humongous_regions += (int) num_regions; | |
| 575 } | |
| 576 assert(regions_accounted_for(), "Region Leakage"); | |
| 577 return res; | |
| 578 } | |
| 579 | |
| 580 HeapWord* | |
| 581 G1CollectedHeap::attempt_allocation_slow(size_t word_size, | |
| 582 bool permit_collection_pause) { | |
| 583 HeapWord* res = NULL; | |
| 584 HeapRegion* allocated_young_region = NULL; | |
| 585 | |
| 586 assert( SafepointSynchronize::is_at_safepoint() || | |
| 587 Heap_lock->owned_by_self(), "pre condition of the call" ); | |
| 588 | |
| 589 if (isHumongous(word_size)) { | |
| 590 // Allocation of a humongous object can, in a sense, complete a | |
| 591 // partial region, if the previous alloc was also humongous, and | |
| 592 // caused the test below to succeed. | |
| 593 if (permit_collection_pause) | |
| 594 do_collection_pause_if_appropriate(word_size); | |
| 595 res = humongousObjAllocate(word_size); | |
| 596 assert(_cur_alloc_region == NULL | |
| 597 || !_cur_alloc_region->isHumongous(), | |
| 598 "Prevent a regression of this bug."); | |
| 599 | |
| 600 } else { | |
|
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601 // We may have concurrent cleanup working at the time. Wait for it |
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602 // to complete. In the future we would probably want to make the |
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603 // concurrent cleanup truly concurrent by decoupling it from the |
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604 // allocation. |
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605 if (!SafepointSynchronize::is_at_safepoint()) |
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606 wait_for_cleanup_complete(); |
| 342 | 607 // If we do a collection pause, this will be reset to a non-NULL |
| 608 // value. If we don't, nulling here ensures that we allocate a new | |
| 609 // region below. | |
| 610 if (_cur_alloc_region != NULL) { | |
| 611 // We're finished with the _cur_alloc_region. | |
|
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612 // As we're builing (at least the young portion) of the collection |
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613 // set incrementally we'll add the current allocation region to |
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614 // the collection set here. |
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615 if (_cur_alloc_region->is_young()) { |
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616 g1_policy()->add_region_to_incremental_cset_lhs(_cur_alloc_region); |
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617 } |
| 342 | 618 _summary_bytes_used += _cur_alloc_region->used(); |
| 619 _cur_alloc_region = NULL; | |
| 620 } | |
| 621 assert(_cur_alloc_region == NULL, "Invariant."); | |
| 622 // Completion of a heap region is perhaps a good point at which to do | |
| 623 // a collection pause. | |
| 624 if (permit_collection_pause) | |
| 625 do_collection_pause_if_appropriate(word_size); | |
| 626 // Make sure we have an allocation region available. | |
| 627 if (_cur_alloc_region == NULL) { | |
| 628 if (!SafepointSynchronize::is_at_safepoint()) | |
| 629 wait_for_cleanup_complete(); | |
| 630 bool next_is_young = should_set_young_locked(); | |
| 631 // If the next region is not young, make sure it's zero-filled. | |
| 632 _cur_alloc_region = newAllocRegion(word_size, !next_is_young); | |
| 633 if (_cur_alloc_region != NULL) { | |
| 634 _summary_bytes_used -= _cur_alloc_region->used(); | |
| 635 if (next_is_young) { | |
| 636 set_region_short_lived_locked(_cur_alloc_region); | |
| 637 allocated_young_region = _cur_alloc_region; | |
| 638 } | |
| 639 } | |
| 640 } | |
| 641 assert(_cur_alloc_region == NULL || !_cur_alloc_region->isHumongous(), | |
| 642 "Prevent a regression of this bug."); | |
| 643 | |
| 644 // Now retry the allocation. | |
| 645 if (_cur_alloc_region != NULL) { | |
|
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646 if (allocated_young_region != NULL) { |
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647 // We need to ensure that the store to top does not |
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648 // float above the setting of the young type. |
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649 OrderAccess::storestore(); |
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650 } |
| 342 | 651 res = _cur_alloc_region->allocate(word_size); |
| 652 } | |
| 653 } | |
| 654 | |
| 655 // NOTE: fails frequently in PRT | |
| 656 assert(regions_accounted_for(), "Region leakage!"); | |
| 657 | |
| 658 if (res != NULL) { | |
| 659 if (!SafepointSynchronize::is_at_safepoint()) { | |
| 660 assert( permit_collection_pause, "invariant" ); | |
| 661 assert( Heap_lock->owned_by_self(), "invariant" ); | |
| 662 Heap_lock->unlock(); | |
| 663 } | |
| 664 | |
| 665 if (allocated_young_region != NULL) { | |
| 666 HeapRegion* hr = allocated_young_region; | |
| 667 HeapWord* bottom = hr->bottom(); | |
| 668 HeapWord* end = hr->end(); | |
| 669 MemRegion mr(bottom, end); | |
| 670 ((CardTableModRefBS*)_g1h->barrier_set())->dirty(mr); | |
| 671 } | |
| 672 } | |
| 673 | |
| 674 assert( SafepointSynchronize::is_at_safepoint() || | |
| 675 (res == NULL && Heap_lock->owned_by_self()) || | |
| 676 (res != NULL && !Heap_lock->owned_by_self()), | |
| 677 "post condition of the call" ); | |
| 678 | |
| 679 return res; | |
| 680 } | |
| 681 | |
| 682 HeapWord* | |
| 683 G1CollectedHeap::mem_allocate(size_t word_size, | |
| 684 bool is_noref, | |
| 685 bool is_tlab, | |
| 686 bool* gc_overhead_limit_was_exceeded) { | |
| 687 debug_only(check_for_valid_allocation_state()); | |
| 688 assert(no_gc_in_progress(), "Allocation during gc not allowed"); | |
| 689 HeapWord* result = NULL; | |
| 690 | |
| 691 // Loop until the allocation is satisified, | |
| 692 // or unsatisfied after GC. | |
| 693 for (int try_count = 1; /* return or throw */; try_count += 1) { | |
| 694 int gc_count_before; | |
| 695 { | |
| 696 Heap_lock->lock(); | |
| 697 result = attempt_allocation(word_size); | |
| 698 if (result != NULL) { | |
| 699 // attempt_allocation should have unlocked the heap lock | |
| 700 assert(is_in(result), "result not in heap"); | |
| 701 return result; | |
| 702 } | |
| 703 // Read the gc count while the heap lock is held. | |
| 704 gc_count_before = SharedHeap::heap()->total_collections(); | |
| 705 Heap_lock->unlock(); | |
| 706 } | |
| 707 | |
| 708 // Create the garbage collection operation... | |
| 709 VM_G1CollectForAllocation op(word_size, | |
| 710 gc_count_before); | |
| 711 | |
| 712 // ...and get the VM thread to execute it. | |
| 713 VMThread::execute(&op); | |
| 714 if (op.prologue_succeeded()) { | |
| 715 result = op.result(); | |
| 716 assert(result == NULL || is_in(result), "result not in heap"); | |
| 717 return result; | |
| 718 } | |
| 719 | |
| 720 // Give a warning if we seem to be looping forever. | |
| 721 if ((QueuedAllocationWarningCount > 0) && | |
| 722 (try_count % QueuedAllocationWarningCount == 0)) { | |
| 723 warning("G1CollectedHeap::mem_allocate_work retries %d times", | |
| 724 try_count); | |
| 725 } | |
| 726 } | |
| 727 } | |
| 728 | |
| 729 void G1CollectedHeap::abandon_cur_alloc_region() { | |
| 730 if (_cur_alloc_region != NULL) { | |
| 731 // We're finished with the _cur_alloc_region. | |
| 732 if (_cur_alloc_region->is_empty()) { | |
| 733 _free_regions++; | |
| 734 free_region(_cur_alloc_region); | |
| 735 } else { | |
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736 // As we're builing (at least the young portion) of the collection |
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737 // set incrementally we'll add the current allocation region to |
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738 // the collection set here. |
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739 if (_cur_alloc_region->is_young()) { |
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740 g1_policy()->add_region_to_incremental_cset_lhs(_cur_alloc_region); |
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741 } |
| 342 | 742 _summary_bytes_used += _cur_alloc_region->used(); |
| 743 } | |
| 744 _cur_alloc_region = NULL; | |
| 745 } | |
| 746 } | |
| 747 | |
| 636 | 748 void G1CollectedHeap::abandon_gc_alloc_regions() { |
| 749 // first, make sure that the GC alloc region list is empty (it should!) | |
| 750 assert(_gc_alloc_region_list == NULL, "invariant"); | |
| 751 release_gc_alloc_regions(true /* totally */); | |
| 752 } | |
| 753 | |
| 342 | 754 class PostMCRemSetClearClosure: public HeapRegionClosure { |
| 755 ModRefBarrierSet* _mr_bs; | |
| 756 public: | |
| 757 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 758 bool doHeapRegion(HeapRegion* r) { | |
| 759 r->reset_gc_time_stamp(); | |
| 760 if (r->continuesHumongous()) | |
| 761 return false; | |
| 762 HeapRegionRemSet* hrrs = r->rem_set(); | |
| 763 if (hrrs != NULL) hrrs->clear(); | |
| 764 // You might think here that we could clear just the cards | |
| 765 // corresponding to the used region. But no: if we leave a dirty card | |
| 766 // in a region we might allocate into, then it would prevent that card | |
| 767 // from being enqueued, and cause it to be missed. | |
| 768 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
| 769 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
| 770 return false; | |
| 771 } | |
| 772 }; | |
| 773 | |
| 774 | |
| 775 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
| 776 ModRefBarrierSet* _mr_bs; | |
| 777 public: | |
| 778 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
| 779 bool doHeapRegion(HeapRegion* r) { | |
| 780 if (r->continuesHumongous()) return false; | |
| 781 if (r->used_region().word_size() != 0) { | |
| 782 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
| 783 } | |
| 784 return false; | |
| 785 } | |
| 786 }; | |
| 787 | |
|
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788 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
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789 G1CollectedHeap* _g1h; |
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790 UpdateRSOopClosure _cl; |
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791 int _worker_i; |
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792 public: |
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793 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
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794 _cl(g1->g1_rem_set()->as_HRInto_G1RemSet(), worker_i), |
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795 _worker_i(worker_i), |
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796 _g1h(g1) |
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797 { } |
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798 bool doHeapRegion(HeapRegion* r) { |
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799 if (!r->continuesHumongous()) { |
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800 _cl.set_from(r); |
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801 r->oop_iterate(&_cl); |
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802 } |
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803 return false; |
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804 } |
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805 }; |
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806 |
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807 class ParRebuildRSTask: public AbstractGangTask { |
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808 G1CollectedHeap* _g1; |
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809 public: |
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810 ParRebuildRSTask(G1CollectedHeap* g1) |
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811 : AbstractGangTask("ParRebuildRSTask"), |
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812 _g1(g1) |
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813 { } |
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814 |
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815 void work(int i) { |
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816 RebuildRSOutOfRegionClosure rebuild_rs(_g1, i); |
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817 _g1->heap_region_par_iterate_chunked(&rebuild_rs, i, |
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818 HeapRegion::RebuildRSClaimValue); |
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819 } |
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820 }; |
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821 |
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822 void G1CollectedHeap::do_collection(bool explicit_gc, |
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823 bool clear_all_soft_refs, |
| 342 | 824 size_t word_size) { |
|
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825 if (GC_locker::check_active_before_gc()) { |
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826 return; // GC is disabled (e.g. JNI GetXXXCritical operation) |
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827 } |
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828 |
| 342 | 829 ResourceMark rm; |
| 830 | |
|
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831 if (PrintHeapAtGC) { |
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832 Universe::print_heap_before_gc(); |
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833 } |
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834 |
| 342 | 835 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); |
| 836 assert(Thread::current() == VMThread::vm_thread(), "should be in vm thread"); | |
| 837 | |
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838 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
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839 collector_policy()->should_clear_all_soft_refs(); |
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840 |
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841 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
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842 |
| 342 | 843 { |
| 844 IsGCActiveMark x; | |
| 845 | |
| 846 // Timing | |
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847 bool system_gc = (gc_cause() == GCCause::_java_lang_system_gc); |
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848 assert(!system_gc || explicit_gc, "invariant"); |
| 342 | 849 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
| 850 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
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851 TraceTime t(system_gc ? "Full GC (System.gc())" : "Full GC", |
|
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852 PrintGC, true, gclog_or_tty); |
| 342 | 853 |
|
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854 TraceMemoryManagerStats tms(true /* fullGC */); |
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855 |
| 342 | 856 double start = os::elapsedTime(); |
| 857 g1_policy()->record_full_collection_start(); | |
| 858 | |
| 859 gc_prologue(true); | |
|
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860 increment_total_collections(true /* full gc */); |
| 342 | 861 |
| 862 size_t g1h_prev_used = used(); | |
| 863 assert(used() == recalculate_used(), "Should be equal"); | |
| 864 | |
| 865 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
| 866 HandleMark hm; // Discard invalid handles created during verification | |
| 867 prepare_for_verify(); | |
| 868 gclog_or_tty->print(" VerifyBeforeGC:"); | |
| 869 Universe::verify(true); | |
| 870 } | |
| 871 assert(regions_accounted_for(), "Region leakage!"); | |
| 872 | |
| 873 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
| 874 | |
| 875 // We want to discover references, but not process them yet. | |
| 876 // This mode is disabled in | |
| 877 // instanceRefKlass::process_discovered_references if the | |
| 878 // generation does some collection work, or | |
| 879 // instanceRefKlass::enqueue_discovered_references if the | |
| 880 // generation returns without doing any work. | |
| 881 ref_processor()->disable_discovery(); | |
| 882 ref_processor()->abandon_partial_discovery(); | |
| 883 ref_processor()->verify_no_references_recorded(); | |
| 884 | |
| 885 // Abandon current iterations of concurrent marking and concurrent | |
| 886 // refinement, if any are in progress. | |
| 887 concurrent_mark()->abort(); | |
| 888 | |
| 889 // Make sure we'll choose a new allocation region afterwards. | |
| 890 abandon_cur_alloc_region(); | |
| 636 | 891 abandon_gc_alloc_regions(); |
| 342 | 892 assert(_cur_alloc_region == NULL, "Invariant."); |
| 893 g1_rem_set()->as_HRInto_G1RemSet()->cleanupHRRS(); | |
| 894 tear_down_region_lists(); | |
| 895 set_used_regions_to_need_zero_fill(); | |
|
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896 |
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897 // We may have added regions to the current incremental collection |
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898 // set between the last GC or pause and now. We need to clear the |
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899 // incremental collection set and then start rebuilding it afresh |
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900 // after this full GC. |
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901 abandon_collection_set(g1_policy()->inc_cset_head()); |
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902 g1_policy()->clear_incremental_cset(); |
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903 g1_policy()->stop_incremental_cset_building(); |
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904 |
| 342 | 905 if (g1_policy()->in_young_gc_mode()) { |
| 906 empty_young_list(); | |
| 907 g1_policy()->set_full_young_gcs(true); | |
| 908 } | |
| 909 | |
| 910 // Temporarily make reference _discovery_ single threaded (non-MT). | |
| 911 ReferenceProcessorMTMutator rp_disc_ser(ref_processor(), false); | |
| 912 | |
| 913 // Temporarily make refs discovery atomic | |
| 914 ReferenceProcessorAtomicMutator rp_disc_atomic(ref_processor(), true); | |
| 915 | |
| 916 // Temporarily clear _is_alive_non_header | |
| 917 ReferenceProcessorIsAliveMutator rp_is_alive_null(ref_processor(), NULL); | |
| 918 | |
| 919 ref_processor()->enable_discovery(); | |
|
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920 ref_processor()->setup_policy(do_clear_all_soft_refs); |
| 342 | 921 |
| 922 // Do collection work | |
| 923 { | |
| 924 HandleMark hm; // Discard invalid handles created during gc | |
|
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925 G1MarkSweep::invoke_at_safepoint(ref_processor(), do_clear_all_soft_refs); |
| 342 | 926 } |
| 927 // Because freeing humongous regions may have added some unclean | |
| 928 // regions, it is necessary to tear down again before rebuilding. | |
| 929 tear_down_region_lists(); | |
| 930 rebuild_region_lists(); | |
| 931 | |
| 932 _summary_bytes_used = recalculate_used(); | |
| 933 | |
| 934 ref_processor()->enqueue_discovered_references(); | |
| 935 | |
| 936 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
| 937 | |
|
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938 MemoryService::track_memory_usage(); |
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939 |
| 342 | 940 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
| 941 HandleMark hm; // Discard invalid handles created during verification | |
| 942 gclog_or_tty->print(" VerifyAfterGC:"); | |
|
637
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943 prepare_for_verify(); |
| 342 | 944 Universe::verify(false); |
| 945 } | |
| 946 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); | |
| 947 | |
| 948 reset_gc_time_stamp(); | |
| 949 // Since everything potentially moved, we will clear all remembered | |
|
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950 // sets, and clear all cards. Later we will rebuild remebered |
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951 // sets. We will also reset the GC time stamps of the regions. |
| 342 | 952 PostMCRemSetClearClosure rs_clear(mr_bs()); |
| 953 heap_region_iterate(&rs_clear); | |
| 954 | |
| 955 // Resize the heap if necessary. | |
|
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956 resize_if_necessary_after_full_collection(explicit_gc ? 0 : word_size); |
| 342 | 957 |
| 958 if (_cg1r->use_cache()) { | |
| 959 _cg1r->clear_and_record_card_counts(); | |
| 960 _cg1r->clear_hot_cache(); | |
| 961 } | |
| 962 | |
|
626
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963 // Rebuild remembered sets of all regions. |
|
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964 |
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965 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
626
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966 ParRebuildRSTask rebuild_rs_task(this); |
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967 assert(check_heap_region_claim_values( |
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968 HeapRegion::InitialClaimValue), "sanity check"); |
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969 set_par_threads(workers()->total_workers()); |
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970 workers()->run_task(&rebuild_rs_task); |
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971 set_par_threads(0); |
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972 assert(check_heap_region_claim_values( |
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973 HeapRegion::RebuildRSClaimValue), "sanity check"); |
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974 reset_heap_region_claim_values(); |
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975 } else { |
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976 RebuildRSOutOfRegionClosure rebuild_rs(this); |
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977 heap_region_iterate(&rebuild_rs); |
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978 } |
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979 |
| 342 | 980 if (PrintGC) { |
| 981 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); | |
| 982 } | |
| 983 | |
| 984 if (true) { // FIXME | |
| 985 // Ask the permanent generation to adjust size for full collections | |
| 986 perm()->compute_new_size(); | |
| 987 } | |
| 988 | |
|
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989 // Start a new incremental collection set for the next pause |
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990 assert(g1_policy()->collection_set() == NULL, "must be"); |
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991 g1_policy()->start_incremental_cset_building(); |
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992 |
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993 // Clear the _cset_fast_test bitmap in anticipation of adding |
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994 // regions to the incremental collection set for the next |
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995 // evacuation pause. |
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996 clear_cset_fast_test(); |
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997 |
| 342 | 998 double end = os::elapsedTime(); |
| 999 g1_policy()->record_full_collection_end(); | |
| 1000 | |
|
546
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1001 #ifdef TRACESPINNING |
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1002 ParallelTaskTerminator::print_termination_counts(); |
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1003 #endif |
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1004 |
| 342 | 1005 gc_epilogue(true); |
| 1006 | |
| 794 | 1007 // Discard all rset updates |
| 1008 JavaThread::dirty_card_queue_set().abandon_logs(); | |
|
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1009 assert(!G1DeferredRSUpdate |
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1010 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
| 342 | 1011 assert(regions_accounted_for(), "Region leakage!"); |
| 1012 } | |
| 1013 | |
| 1014 if (g1_policy()->in_young_gc_mode()) { | |
| 1015 _young_list->reset_sampled_info(); | |
|
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1016 // At this point there should be no regions in the |
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1017 // entire heap tagged as young. |
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1018 assert( check_young_list_empty(true /* check_heap */), |
| 342 | 1019 "young list should be empty at this point"); |
| 1020 } | |
|
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1021 |
|
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1022 // Update the number of full collections that have been completed. |
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1023 increment_full_collections_completed(false /* outer */); |
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1024 |
|
838
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1025 if (PrintHeapAtGC) { |
|
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1026 Universe::print_heap_after_gc(); |
|
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1027 } |
| 342 | 1028 } |
| 1029 | |
| 1030 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
|
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1031 do_collection(true, /* explicit_gc */ |
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1032 clear_all_soft_refs, |
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1033 0 /* word_size */); |
| 342 | 1034 } |
| 1035 | |
| 1036 // This code is mostly copied from TenuredGeneration. | |
| 1037 void | |
| 1038 G1CollectedHeap:: | |
| 1039 resize_if_necessary_after_full_collection(size_t word_size) { | |
| 1040 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
| 1041 | |
| 1042 // Include the current allocation, if any, and bytes that will be | |
| 1043 // pre-allocated to support collections, as "used". | |
| 1044 const size_t used_after_gc = used(); | |
| 1045 const size_t capacity_after_gc = capacity(); | |
| 1046 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
| 1047 | |
|
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1048 // This is enforced in arguments.cpp. |
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1049 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, |
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1050 "otherwise the code below doesn't make sense"); |
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1051 |
| 342 | 1052 // We don't have floating point command-line arguments |
|
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1053 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100.0; |
| 342 | 1054 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
|
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1055 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100.0; |
| 342 | 1056 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
| 1057 | |
|
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1058 const size_t min_heap_size = collector_policy()->min_heap_byte_size(); |
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1059 const size_t max_heap_size = collector_policy()->max_heap_byte_size(); |
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1060 |
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1061 // We have to be careful here as these two calculations can overflow |
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1062 // 32-bit size_t's. |
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1063 double used_after_gc_d = (double) used_after_gc; |
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1064 double minimum_desired_capacity_d = used_after_gc_d / maximum_used_percentage; |
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1065 double maximum_desired_capacity_d = used_after_gc_d / minimum_used_percentage; |
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1066 |
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1067 // Let's make sure that they are both under the max heap size, which |
|
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1068 // by default will make them fit into a size_t. |
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1069 double desired_capacity_upper_bound = (double) max_heap_size; |
|
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1070 minimum_desired_capacity_d = MIN2(minimum_desired_capacity_d, |
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1071 desired_capacity_upper_bound); |
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1072 maximum_desired_capacity_d = MIN2(maximum_desired_capacity_d, |
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1073 desired_capacity_upper_bound); |
|
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1074 |
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1075 // We can now safely turn them into size_t's. |
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1076 size_t minimum_desired_capacity = (size_t) minimum_desired_capacity_d; |
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1077 size_t maximum_desired_capacity = (size_t) maximum_desired_capacity_d; |
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1078 |
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1079 // This assert only makes sense here, before we adjust them |
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1080 // with respect to the min and max heap size. |
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1081 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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1082 err_msg("minimum_desired_capacity = "SIZE_FORMAT", " |
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1083 "maximum_desired_capacity = "SIZE_FORMAT, |
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1084 minimum_desired_capacity, maximum_desired_capacity)); |
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1085 |
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1086 // Should not be greater than the heap max size. No need to adjust |
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1087 // it with respect to the heap min size as it's a lower bound (i.e., |
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1088 // we'll try to make the capacity larger than it, not smaller). |
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1089 minimum_desired_capacity = MIN2(minimum_desired_capacity, max_heap_size); |
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1090 // Should not be less than the heap min size. No need to adjust it |
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1091 // with respect to the heap max size as it's an upper bound (i.e., |
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1092 // we'll try to make the capacity smaller than it, not greater). |
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1093 maximum_desired_capacity = MAX2(maximum_desired_capacity, min_heap_size); |
| 342 | 1094 |
| 1095 if (PrintGC && Verbose) { | |
|
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1096 const double free_percentage = |
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1097 (double) free_after_gc / (double) capacity_after_gc; |
| 342 | 1098 gclog_or_tty->print_cr("Computing new size after full GC "); |
| 1099 gclog_or_tty->print_cr(" " | |
| 1100 " minimum_free_percentage: %6.2f", | |
| 1101 minimum_free_percentage); | |
| 1102 gclog_or_tty->print_cr(" " | |
| 1103 " maximum_free_percentage: %6.2f", | |
| 1104 maximum_free_percentage); | |
| 1105 gclog_or_tty->print_cr(" " | |
| 1106 " capacity: %6.1fK" | |
| 1107 " minimum_desired_capacity: %6.1fK" | |
| 1108 " maximum_desired_capacity: %6.1fK", | |
|
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1109 (double) capacity_after_gc / (double) K, |
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1110 (double) minimum_desired_capacity / (double) K, |
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1111 (double) maximum_desired_capacity / (double) K); |
| 342 | 1112 gclog_or_tty->print_cr(" " |
|
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1113 " free_after_gc: %6.1fK" |
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1114 " used_after_gc: %6.1fK", |
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1115 (double) free_after_gc / (double) K, |
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1116 (double) used_after_gc / (double) K); |
| 342 | 1117 gclog_or_tty->print_cr(" " |
| 1118 " free_percentage: %6.2f", | |
| 1119 free_percentage); | |
| 1120 } | |
|
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1121 if (capacity_after_gc < minimum_desired_capacity) { |
| 342 | 1122 // Don't expand unless it's significant |
| 1123 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
| 1124 expand(expand_bytes); | |
| 1125 if (PrintGC && Verbose) { | |
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1126 gclog_or_tty->print_cr(" " |
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1127 " expanding:" |
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1128 " max_heap_size: %6.1fK" |
| 342 | 1129 " minimum_desired_capacity: %6.1fK" |
| 1130 " expand_bytes: %6.1fK", | |
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1131 (double) max_heap_size / (double) K, |
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1132 (double) minimum_desired_capacity / (double) K, |
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1133 (double) expand_bytes / (double) K); |
| 342 | 1134 } |
| 1135 | |
| 1136 // No expansion, now see if we want to shrink | |
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1137 } else if (capacity_after_gc > maximum_desired_capacity) { |
| 342 | 1138 // Capacity too large, compute shrinking size |
| 1139 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
| 1140 shrink(shrink_bytes); | |
| 1141 if (PrintGC && Verbose) { | |
| 1142 gclog_or_tty->print_cr(" " | |
| 1143 " shrinking:" | |
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1144 " min_heap_size: %6.1fK" |
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1145 " maximum_desired_capacity: %6.1fK" |
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1146 " shrink_bytes: %6.1fK", |
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1147 (double) min_heap_size / (double) K, |
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1148 (double) maximum_desired_capacity / (double) K, |
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1149 (double) shrink_bytes / (double) K); |
| 342 | 1150 } |
| 1151 } | |
| 1152 } | |
| 1153 | |
| 1154 | |
| 1155 HeapWord* | |
| 1156 G1CollectedHeap::satisfy_failed_allocation(size_t word_size) { | |
| 1157 HeapWord* result = NULL; | |
| 1158 | |
| 1159 // In a G1 heap, we're supposed to keep allocation from failing by | |
| 1160 // incremental pauses. Therefore, at least for now, we'll favor | |
| 1161 // expansion over collection. (This might change in the future if we can | |
| 1162 // do something smarter than full collection to satisfy a failed alloc.) | |
| 1163 | |
| 1164 result = expand_and_allocate(word_size); | |
| 1165 if (result != NULL) { | |
| 1166 assert(is_in(result), "result not in heap"); | |
| 1167 return result; | |
| 1168 } | |
| 1169 | |
| 1170 // OK, I guess we have to try collection. | |
| 1171 | |
| 1172 do_collection(false, false, word_size); | |
| 1173 | |
| 1174 result = attempt_allocation(word_size, /*permit_collection_pause*/false); | |
| 1175 | |
| 1176 if (result != NULL) { | |
| 1177 assert(is_in(result), "result not in heap"); | |
| 1178 return result; | |
| 1179 } | |
| 1180 | |
| 1181 // Try collecting soft references. | |
| 1182 do_collection(false, true, word_size); | |
| 1183 result = attempt_allocation(word_size, /*permit_collection_pause*/false); | |
| 1184 if (result != NULL) { | |
| 1185 assert(is_in(result), "result not in heap"); | |
| 1186 return result; | |
| 1187 } | |
| 1188 | |
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1189 assert(!collector_policy()->should_clear_all_soft_refs(), |
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1190 "Flag should have been handled and cleared prior to this point"); |
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1191 |
| 342 | 1192 // What else? We might try synchronous finalization later. If the total |
| 1193 // space available is large enough for the allocation, then a more | |
| 1194 // complete compaction phase than we've tried so far might be | |
| 1195 // appropriate. | |
| 1196 return NULL; | |
| 1197 } | |
| 1198 | |
| 1199 // Attempting to expand the heap sufficiently | |
| 1200 // to support an allocation of the given "word_size". If | |
| 1201 // successful, perform the allocation and return the address of the | |
| 1202 // allocated block, or else "NULL". | |
| 1203 | |
| 1204 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
| 1205 size_t expand_bytes = word_size * HeapWordSize; | |
| 1206 if (expand_bytes < MinHeapDeltaBytes) { | |
| 1207 expand_bytes = MinHeapDeltaBytes; | |
| 1208 } | |
| 1209 expand(expand_bytes); | |
| 1210 assert(regions_accounted_for(), "Region leakage!"); | |
| 1211 HeapWord* result = attempt_allocation(word_size, false /* permit_collection_pause */); | |
| 1212 return result; | |
| 1213 } | |
| 1214 | |
| 1215 size_t G1CollectedHeap::free_region_if_totally_empty(HeapRegion* hr) { | |
| 1216 size_t pre_used = 0; | |
| 1217 size_t cleared_h_regions = 0; | |
| 1218 size_t freed_regions = 0; | |
| 1219 UncleanRegionList local_list; | |
| 1220 free_region_if_totally_empty_work(hr, pre_used, cleared_h_regions, | |
| 1221 freed_regions, &local_list); | |
| 1222 | |
| 1223 finish_free_region_work(pre_used, cleared_h_regions, freed_regions, | |
| 1224 &local_list); | |
| 1225 return pre_used; | |
| 1226 } | |
| 1227 | |
| 1228 void | |
| 1229 G1CollectedHeap::free_region_if_totally_empty_work(HeapRegion* hr, | |
| 1230 size_t& pre_used, | |
| 1231 size_t& cleared_h, | |
| 1232 size_t& freed_regions, | |
| 1233 UncleanRegionList* list, | |
| 1234 bool par) { | |
| 1235 assert(!hr->continuesHumongous(), "should have filtered these out"); | |
| 1236 size_t res = 0; | |
| 677 | 1237 if (hr->used() > 0 && hr->garbage_bytes() == hr->used() && |
| 1238 !hr->is_young()) { | |
| 1239 if (G1PolicyVerbose > 0) | |
| 1240 gclog_or_tty->print_cr("Freeing empty region "PTR_FORMAT "(" SIZE_FORMAT " bytes)" | |
| 1241 " during cleanup", hr, hr->used()); | |
| 1242 free_region_work(hr, pre_used, cleared_h, freed_regions, list, par); | |
| 342 | 1243 } |
| 1244 } | |
| 1245 | |
| 1246 // FIXME: both this and shrink could probably be more efficient by | |
| 1247 // doing one "VirtualSpace::expand_by" call rather than several. | |
| 1248 void G1CollectedHeap::expand(size_t expand_bytes) { | |
| 1249 size_t old_mem_size = _g1_storage.committed_size(); | |
| 1250 // We expand by a minimum of 1K. | |
| 1251 expand_bytes = MAX2(expand_bytes, (size_t)K); | |
| 1252 size_t aligned_expand_bytes = | |
| 1253 ReservedSpace::page_align_size_up(expand_bytes); | |
| 1254 aligned_expand_bytes = align_size_up(aligned_expand_bytes, | |
| 1255 HeapRegion::GrainBytes); | |
| 1256 expand_bytes = aligned_expand_bytes; | |
| 1257 while (expand_bytes > 0) { | |
| 1258 HeapWord* base = (HeapWord*)_g1_storage.high(); | |
| 1259 // Commit more storage. | |
| 1260 bool successful = _g1_storage.expand_by(HeapRegion::GrainBytes); | |
| 1261 if (!successful) { | |
| 1262 expand_bytes = 0; | |
| 1263 } else { | |
| 1264 expand_bytes -= HeapRegion::GrainBytes; | |
| 1265 // Expand the committed region. | |
| 1266 HeapWord* high = (HeapWord*) _g1_storage.high(); | |
| 1267 _g1_committed.set_end(high); | |
| 1268 // Create a new HeapRegion. | |
| 1269 MemRegion mr(base, high); | |
| 1270 bool is_zeroed = !_g1_max_committed.contains(base); | |
| 1271 HeapRegion* hr = new HeapRegion(_bot_shared, mr, is_zeroed); | |
| 1272 | |
| 1273 // Now update max_committed if necessary. | |
| 1274 _g1_max_committed.set_end(MAX2(_g1_max_committed.end(), high)); | |
| 1275 | |
| 1276 // Add it to the HeapRegionSeq. | |
| 1277 _hrs->insert(hr); | |
| 1278 // Set the zero-fill state, according to whether it's already | |
| 1279 // zeroed. | |
| 1280 { | |
| 1281 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 1282 if (is_zeroed) { | |
| 1283 hr->set_zero_fill_complete(); | |
| 1284 put_free_region_on_list_locked(hr); | |
| 1285 } else { | |
| 1286 hr->set_zero_fill_needed(); | |
| 1287 put_region_on_unclean_list_locked(hr); | |
| 1288 } | |
| 1289 } | |
| 1290 _free_regions++; | |
| 1291 // And we used up an expansion region to create it. | |
| 1292 _expansion_regions--; | |
| 1293 // Tell the cardtable about it. | |
| 1294 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
| 1295 // And the offset table as well. | |
| 1296 _bot_shared->resize(_g1_committed.word_size()); | |
| 1297 } | |
| 1298 } | |
| 1299 if (Verbose && PrintGC) { | |
| 1300 size_t new_mem_size = _g1_storage.committed_size(); | |
| 1301 gclog_or_tty->print_cr("Expanding garbage-first heap from %ldK by %ldK to %ldK", | |
| 1302 old_mem_size/K, aligned_expand_bytes/K, | |
| 1303 new_mem_size/K); | |
| 1304 } | |
| 1305 } | |
| 1306 | |
| 1307 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) | |
| 1308 { | |
| 1309 size_t old_mem_size = _g1_storage.committed_size(); | |
| 1310 size_t aligned_shrink_bytes = | |
| 1311 ReservedSpace::page_align_size_down(shrink_bytes); | |
| 1312 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
| 1313 HeapRegion::GrainBytes); | |
| 1314 size_t num_regions_deleted = 0; | |
| 1315 MemRegion mr = _hrs->shrink_by(aligned_shrink_bytes, num_regions_deleted); | |
| 1316 | |
| 1317 assert(mr.end() == (HeapWord*)_g1_storage.high(), "Bad shrink!"); | |
| 1318 if (mr.byte_size() > 0) | |
| 1319 _g1_storage.shrink_by(mr.byte_size()); | |
| 1320 assert(mr.start() == (HeapWord*)_g1_storage.high(), "Bad shrink!"); | |
| 1321 | |
| 1322 _g1_committed.set_end(mr.start()); | |
| 1323 _free_regions -= num_regions_deleted; | |
| 1324 _expansion_regions += num_regions_deleted; | |
| 1325 | |
| 1326 // Tell the cardtable about it. | |
| 1327 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
| 1328 | |
| 1329 // And the offset table as well. | |
| 1330 _bot_shared->resize(_g1_committed.word_size()); | |
| 1331 | |
| 1332 HeapRegionRemSet::shrink_heap(n_regions()); | |
| 1333 | |
| 1334 if (Verbose && PrintGC) { | |
| 1335 size_t new_mem_size = _g1_storage.committed_size(); | |
| 1336 gclog_or_tty->print_cr("Shrinking garbage-first heap from %ldK by %ldK to %ldK", | |
| 1337 old_mem_size/K, aligned_shrink_bytes/K, | |
| 1338 new_mem_size/K); | |
| 1339 } | |
| 1340 } | |
| 1341 | |
| 1342 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
| 636 | 1343 release_gc_alloc_regions(true /* totally */); |
| 342 | 1344 tear_down_region_lists(); // We will rebuild them in a moment. |
| 1345 shrink_helper(shrink_bytes); | |
| 1346 rebuild_region_lists(); | |
| 1347 } | |
| 1348 | |
| 1349 // Public methods. | |
| 1350 | |
| 1351 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
| 1352 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 1353 #endif // _MSC_VER | |
| 1354 | |
| 1355 | |
| 1356 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
| 1357 SharedHeap(policy_), | |
| 1358 _g1_policy(policy_), | |
| 1111 | 1359 _dirty_card_queue_set(false), |
| 1705 | 1360 _into_cset_dirty_card_queue_set(false), |
| 342 | 1361 _ref_processor(NULL), |
| 1362 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), | |
| 1363 _bot_shared(NULL), | |
| 1364 _par_alloc_during_gc_lock(Mutex::leaf, "par alloc during GC lock"), | |
| 1365 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
| 1366 _evac_failure_scan_stack(NULL) , | |
| 1367 _mark_in_progress(false), | |
| 1368 _cg1r(NULL), _czft(NULL), _summary_bytes_used(0), | |
| 1369 _cur_alloc_region(NULL), | |
| 1370 _refine_cte_cl(NULL), | |
| 1371 _free_region_list(NULL), _free_region_list_size(0), | |
| 1372 _free_regions(0), | |
| 1373 _full_collection(false), | |
| 1374 _unclean_region_list(), | |
| 1375 _unclean_regions_coming(false), | |
| 1376 _young_list(new YoungList(this)), | |
| 1377 _gc_time_stamp(0), | |
| 526 | 1378 _surviving_young_words(NULL), |
|
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1379 _full_collections_completed(0), |
| 526 | 1380 _in_cset_fast_test(NULL), |
|
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1381 _in_cset_fast_test_base(NULL), |
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1382 _dirty_cards_region_list(NULL) { |
| 342 | 1383 _g1h = this; // To catch bugs. |
| 1384 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
| 1385 vm_exit_during_initialization("Failed necessary allocation."); | |
| 1386 } | |
|
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1387 |
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1388 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1389 |
| 342 | 1390 int n_queues = MAX2((int)ParallelGCThreads, 1); |
| 1391 _task_queues = new RefToScanQueueSet(n_queues); | |
| 1392 | |
| 1393 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
| 1394 assert(n_rem_sets > 0, "Invariant."); | |
| 1395 | |
| 1396 HeapRegionRemSetIterator** iter_arr = | |
| 1397 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
| 1398 for (int i = 0; i < n_queues; i++) { | |
| 1399 iter_arr[i] = new HeapRegionRemSetIterator(); | |
| 1400 } | |
| 1401 _rem_set_iterator = iter_arr; | |
| 1402 | |
| 1403 for (int i = 0; i < n_queues; i++) { | |
| 1404 RefToScanQueue* q = new RefToScanQueue(); | |
| 1405 q->initialize(); | |
| 1406 _task_queues->register_queue(i, q); | |
| 1407 } | |
| 1408 | |
| 1409 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 636 | 1410 _gc_alloc_regions[ap] = NULL; |
| 1411 _gc_alloc_region_counts[ap] = 0; | |
| 1412 _retained_gc_alloc_regions[ap] = NULL; | |
| 1413 // by default, we do not retain a GC alloc region for each ap; | |
| 1414 // we'll override this, when appropriate, below | |
| 1415 _retain_gc_alloc_region[ap] = false; | |
| 1416 } | |
| 1417 | |
| 1418 // We will try to remember the last half-full tenured region we | |
| 1419 // allocated to at the end of a collection so that we can re-use it | |
| 1420 // during the next collection. | |
| 1421 _retain_gc_alloc_region[GCAllocForTenured] = true; | |
| 1422 | |
| 342 | 1423 guarantee(_task_queues != NULL, "task_queues allocation failure."); |
| 1424 } | |
| 1425 | |
| 1426 jint G1CollectedHeap::initialize() { | |
| 1166 | 1427 CollectedHeap::pre_initialize(); |
| 342 | 1428 os::enable_vtime(); |
| 1429 | |
| 1430 // Necessary to satisfy locking discipline assertions. | |
| 1431 | |
| 1432 MutexLocker x(Heap_lock); | |
| 1433 | |
| 1434 // While there are no constraints in the GC code that HeapWordSize | |
| 1435 // be any particular value, there are multiple other areas in the | |
| 1436 // system which believe this to be true (e.g. oop->object_size in some | |
| 1437 // cases incorrectly returns the size in wordSize units rather than | |
| 1438 // HeapWordSize). | |
| 1439 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
| 1440 | |
| 1441 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
| 1442 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
| 1443 | |
| 1444 // Ensure that the sizes are properly aligned. | |
| 1445 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1446 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
| 1447 | |
| 1448 _cg1r = new ConcurrentG1Refine(); | |
| 1449 | |
| 1450 // Reserve the maximum. | |
| 1451 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
| 1452 // Includes the perm-gen. | |
|
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1453 |
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1454 const size_t total_reserved = max_byte_size + pgs->max_size(); |
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1455 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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1456 |
| 342 | 1457 ReservedSpace heap_rs(max_byte_size + pgs->max_size(), |
| 1458 HeapRegion::GrainBytes, | |
|
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1459 false /*ism*/, addr); |
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1460 |
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1461 if (UseCompressedOops) { |
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1462 if (addr != NULL && !heap_rs.is_reserved()) { |
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1463 // Failed to reserve at specified address - the requested memory |
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1464 // region is taken already, for example, by 'java' launcher. |
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1465 // Try again to reserver heap higher. |
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1466 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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1467 ReservedSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
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1468 false /*ism*/, addr); |
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1469 if (addr != NULL && !heap_rs0.is_reserved()) { |
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1470 // Failed to reserve at specified address again - give up. |
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1471 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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1472 assert(addr == NULL, ""); |
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1473 ReservedSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
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1474 false /*ism*/, addr); |
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1475 heap_rs = heap_rs1; |
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1476 } else { |
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1477 heap_rs = heap_rs0; |
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1478 } |
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1479 } |
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1480 } |
| 342 | 1481 |
| 1482 if (!heap_rs.is_reserved()) { | |
| 1483 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
| 1484 return JNI_ENOMEM; | |
| 1485 } | |
| 1486 | |
| 1487 // It is important to do this in a way such that concurrent readers can't | |
| 1488 // temporarily think somethings in the heap. (I've actually seen this | |
| 1489 // happen in asserts: DLD.) | |
| 1490 _reserved.set_word_size(0); | |
| 1491 _reserved.set_start((HeapWord*)heap_rs.base()); | |
| 1492 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
| 1493 | |
| 1494 _expansion_regions = max_byte_size/HeapRegion::GrainBytes; | |
| 1495 | |
| 1496 _num_humongous_regions = 0; | |
| 1497 | |
| 1498 // Create the gen rem set (and barrier set) for the entire reserved region. | |
| 1499 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
| 1500 set_barrier_set(rem_set()->bs()); | |
| 1501 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
| 1502 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
| 1503 } else { | |
| 1504 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
| 1505 return JNI_ENOMEM; | |
| 1506 } | |
| 1507 | |
| 1508 // Also create a G1 rem set. | |
| 1509 if (G1UseHRIntoRS) { | |
| 1510 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { | |
| 1511 _g1_rem_set = new HRInto_G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
| 1512 } else { | |
| 1513 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); | |
| 1514 return JNI_ENOMEM; | |
| 1515 } | |
| 1516 } else { | |
| 1517 _g1_rem_set = new StupidG1RemSet(this); | |
| 1518 } | |
| 1519 | |
| 1520 // Carve out the G1 part of the heap. | |
| 1521 | |
| 1522 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
| 1523 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
| 1524 g1_rs.size()/HeapWordSize); | |
| 1525 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
| 1526 | |
| 1527 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
| 1528 | |
| 1529 _g1_storage.initialize(g1_rs, 0); | |
| 1530 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
| 1531 _g1_max_committed = _g1_committed; | |
| 393 | 1532 _hrs = new HeapRegionSeq(_expansion_regions); |
| 342 | 1533 guarantee(_hrs != NULL, "Couldn't allocate HeapRegionSeq"); |
| 1534 guarantee(_cur_alloc_region == NULL, "from constructor"); | |
| 1535 | |
|
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1536 // 6843694 - ensure that the maximum region index can fit |
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1537 // in the remembered set structures. |
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1538 const size_t max_region_idx = ((size_t)1 << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
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1539 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
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1540 |
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1541 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
|
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1542 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
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1543 guarantee((size_t) HeapRegion::CardsPerRegion < max_cards_per_region, |
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1544 "too many cards per region"); |
|
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1545 |
| 342 | 1546 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
| 1547 heap_word_size(init_byte_size)); | |
| 1548 | |
| 1549 _g1h = this; | |
| 1550 | |
|
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1551 _in_cset_fast_test_length = max_regions(); |
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1552 _in_cset_fast_test_base = NEW_C_HEAP_ARRAY(bool, _in_cset_fast_test_length); |
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1553 |
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1554 // We're biasing _in_cset_fast_test to avoid subtracting the |
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1555 // beginning of the heap every time we want to index; basically |
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1556 // it's the same with what we do with the card table. |
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1557 _in_cset_fast_test = _in_cset_fast_test_base - |
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1558 ((size_t) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
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1559 |
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1560 // Clear the _cset_fast_test bitmap in anticipation of adding |
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1561 // regions to the incremental collection set for the first |
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1562 // evacuation pause. |
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1563 clear_cset_fast_test(); |
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1564 |
| 342 | 1565 // Create the ConcurrentMark data structure and thread. |
| 1566 // (Must do this late, so that "max_regions" is defined.) | |
| 1567 _cm = new ConcurrentMark(heap_rs, (int) max_regions()); | |
| 1568 _cmThread = _cm->cmThread(); | |
| 1569 | |
| 1570 // ...and the concurrent zero-fill thread, if necessary. | |
| 1571 if (G1ConcZeroFill) { | |
| 1572 _czft = new ConcurrentZFThread(); | |
| 1573 } | |
| 1574 | |
| 1575 // Initialize the from_card cache structure of HeapRegionRemSet. | |
| 1576 HeapRegionRemSet::init_heap(max_regions()); | |
| 1577 | |
| 677 | 1578 // Now expand into the initial heap size. |
| 1579 expand(init_byte_size); | |
| 342 | 1580 |
| 1581 // Perform any initialization actions delegated to the policy. | |
| 1582 g1_policy()->init(); | |
| 1583 | |
| 1584 g1_policy()->note_start_of_mark_thread(); | |
| 1585 | |
| 1586 _refine_cte_cl = | |
| 1587 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
| 1588 g1_rem_set(), | |
| 1589 concurrent_g1_refine()); | |
| 1590 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
| 1591 | |
| 1592 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
| 1593 SATB_Q_FL_lock, | |
| 1111 | 1594 G1SATBProcessCompletedThreshold, |
| 342 | 1595 Shared_SATB_Q_lock); |
| 794 | 1596 |
| 1597 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
| 1598 DirtyCardQ_FL_lock, | |
| 1111 | 1599 concurrent_g1_refine()->yellow_zone(), |
| 1600 concurrent_g1_refine()->red_zone(), | |
| 794 | 1601 Shared_DirtyCardQ_lock); |
| 1602 | |
|
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1603 if (G1DeferredRSUpdate) { |
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1604 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
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1605 DirtyCardQ_FL_lock, |
| 1111 | 1606 -1, // never trigger processing |
| 1607 -1, // no limit on length | |
|
616
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1608 Shared_DirtyCardQ_lock, |
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1609 &JavaThread::dirty_card_queue_set()); |
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1610 } |
| 1705 | 1611 |
| 1612 // Initialize the card queue set used to hold cards containing | |
| 1613 // references into the collection set. | |
| 1614 _into_cset_dirty_card_queue_set.initialize(DirtyCardQ_CBL_mon, | |
| 1615 DirtyCardQ_FL_lock, | |
| 1616 -1, // never trigger processing | |
| 1617 -1, // no limit on length | |
| 1618 Shared_DirtyCardQ_lock, | |
| 1619 &JavaThread::dirty_card_queue_set()); | |
| 1620 | |
| 342 | 1621 // In case we're keeping closure specialization stats, initialize those |
| 1622 // counts and that mechanism. | |
| 1623 SpecializationStats::clear(); | |
| 1624 | |
| 1625 _gc_alloc_region_list = NULL; | |
| 1626 | |
| 1627 // Do later initialization work for concurrent refinement. | |
| 1628 _cg1r->init(); | |
| 1629 | |
| 1630 return JNI_OK; | |
| 1631 } | |
| 1632 | |
| 1633 void G1CollectedHeap::ref_processing_init() { | |
| 1634 SharedHeap::ref_processing_init(); | |
| 1635 MemRegion mr = reserved_region(); | |
| 1636 _ref_processor = ReferenceProcessor::create_ref_processor( | |
| 1637 mr, // span | |
| 1638 false, // Reference discovery is not atomic | |
| 1639 // (though it shouldn't matter here.) | |
| 1640 true, // mt_discovery | |
| 1641 NULL, // is alive closure: need to fill this in for efficiency | |
| 1642 ParallelGCThreads, | |
| 1643 ParallelRefProcEnabled, | |
| 1644 true); // Setting next fields of discovered | |
| 1645 // lists requires a barrier. | |
| 1646 } | |
| 1647 | |
| 1648 size_t G1CollectedHeap::capacity() const { | |
| 1649 return _g1_committed.byte_size(); | |
| 1650 } | |
| 1651 | |
| 1705 | 1652 void G1CollectedHeap::iterate_dirty_card_closure(CardTableEntryClosure* cl, |
| 1653 DirtyCardQueue* into_cset_dcq, | |
| 1654 bool concurrent, | |
| 342 | 1655 int worker_i) { |
| 889 | 1656 // Clean cards in the hot card cache |
| 1705 | 1657 concurrent_g1_refine()->clean_up_cache(worker_i, g1_rem_set(), into_cset_dcq); |
| 889 | 1658 |
| 342 | 1659 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
| 1660 int n_completed_buffers = 0; | |
| 1705 | 1661 while (dcqs.apply_closure_to_completed_buffer(cl, worker_i, 0, true)) { |
| 342 | 1662 n_completed_buffers++; |
| 1663 } | |
| 1664 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
| 1665 (double) n_completed_buffers); | |
| 1666 dcqs.clear_n_completed_buffers(); | |
| 1667 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
| 1668 } | |
| 1669 | |
| 1670 | |
| 1671 // Computes the sum of the storage used by the various regions. | |
| 1672 | |
| 1673 size_t G1CollectedHeap::used() const { | |
|
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1674 assert(Heap_lock->owner() != NULL, |
|
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|
1675 "Should be owned on this thread's behalf."); |
| 342 | 1676 size_t result = _summary_bytes_used; |
|
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1677 // Read only once in case it is set to NULL concurrently |
|
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|
1678 HeapRegion* hr = _cur_alloc_region; |
|
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1679 if (hr != NULL) |
|
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1680 result += hr->used(); |
| 342 | 1681 return result; |
| 1682 } | |
| 1683 | |
|
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|
1684 size_t G1CollectedHeap::used_unlocked() const { |
|
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1685 size_t result = _summary_bytes_used; |
|
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1686 return result; |
|
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|
1687 } |
|
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|
1688 |
| 342 | 1689 class SumUsedClosure: public HeapRegionClosure { |
| 1690 size_t _used; | |
| 1691 public: | |
| 1692 SumUsedClosure() : _used(0) {} | |
| 1693 bool doHeapRegion(HeapRegion* r) { | |
| 1694 if (!r->continuesHumongous()) { | |
| 1695 _used += r->used(); | |
| 1696 } | |
| 1697 return false; | |
| 1698 } | |
| 1699 size_t result() { return _used; } | |
| 1700 }; | |
| 1701 | |
| 1702 size_t G1CollectedHeap::recalculate_used() const { | |
| 1703 SumUsedClosure blk; | |
| 1704 _hrs->iterate(&blk); | |
| 1705 return blk.result(); | |
| 1706 } | |
| 1707 | |
| 1708 #ifndef PRODUCT | |
| 1709 class SumUsedRegionsClosure: public HeapRegionClosure { | |
| 1710 size_t _num; | |
| 1711 public: | |
| 677 | 1712 SumUsedRegionsClosure() : _num(0) {} |
| 342 | 1713 bool doHeapRegion(HeapRegion* r) { |
| 1714 if (r->continuesHumongous() || r->used() > 0 || r->is_gc_alloc_region()) { | |
| 1715 _num += 1; | |
| 1716 } | |
| 1717 return false; | |
| 1718 } | |
| 1719 size_t result() { return _num; } | |
| 1720 }; | |
| 1721 | |
| 1722 size_t G1CollectedHeap::recalculate_used_regions() const { | |
| 1723 SumUsedRegionsClosure blk; | |
| 1724 _hrs->iterate(&blk); | |
| 1725 return blk.result(); | |
| 1726 } | |
| 1727 #endif // PRODUCT | |
| 1728 | |
| 1729 size_t G1CollectedHeap::unsafe_max_alloc() { | |
| 1730 if (_free_regions > 0) return HeapRegion::GrainBytes; | |
| 1731 // otherwise, is there space in the current allocation region? | |
| 1732 | |
| 1733 // We need to store the current allocation region in a local variable | |
| 1734 // here. The problem is that this method doesn't take any locks and | |
| 1735 // there may be other threads which overwrite the current allocation | |
| 1736 // region field. attempt_allocation(), for example, sets it to NULL | |
| 1737 // and this can happen *after* the NULL check here but before the call | |
| 1738 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
| 1739 // to be a problem in the optimized build, since the two loads of the | |
| 1740 // current allocation region field are optimized away. | |
| 1741 HeapRegion* car = _cur_alloc_region; | |
| 1742 | |
| 1743 // FIXME: should iterate over all regions? | |
| 1744 if (car == NULL) { | |
| 1745 return 0; | |
| 1746 } | |
| 1747 return car->free(); | |
| 1748 } | |
| 1749 | |
|
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1750 bool G1CollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { |
|
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1751 return |
|
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|
1752 ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
|
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|
1753 (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)); |
|
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|
1754 } |
|
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|
1755 |
|
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|
1756 void G1CollectedHeap::increment_full_collections_completed(bool outer) { |
|
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|
1757 MonitorLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
|
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1758 |
|
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|
1759 // We have already incremented _total_full_collections at the start |
|
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|
1760 // of the GC, so total_full_collections() represents how many full |
|
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|
1761 // collections have been started. |
|
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|
1762 unsigned int full_collections_started = total_full_collections(); |
|
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1763 |
|
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|
1764 // Given that this method is called at the end of a Full GC or of a |
|
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1765 // concurrent cycle, and those can be nested (i.e., a Full GC can |
|
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|
1766 // interrupt a concurrent cycle), the number of full collections |
|
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|
1767 // completed should be either one (in the case where there was no |
|
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|
1768 // nesting) or two (when a Full GC interrupted a concurrent cycle) |
|
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|
1769 // behind the number of full collections started. |
|
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|
1770 |
|
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|
1771 // This is the case for the inner caller, i.e. a Full GC. |
|
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|
1772 assert(outer || |
|
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|
1773 (full_collections_started == _full_collections_completed + 1) || |
|
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|
1774 (full_collections_started == _full_collections_completed + 2), |
|
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|
1775 err_msg("for inner caller: full_collections_started = %u " |
|
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|
1776 "is inconsistent with _full_collections_completed = %u", |
|
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|
1777 full_collections_started, _full_collections_completed)); |
|
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|
1778 |
|
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|
1779 // This is the case for the outer caller, i.e. the concurrent cycle. |
|
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|
1780 assert(!outer || |
|
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|
1781 (full_collections_started == _full_collections_completed + 1), |
|
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|
1782 err_msg("for outer caller: full_collections_started = %u " |
|
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|
1783 "is inconsistent with _full_collections_completed = %u", |
|
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|
1784 full_collections_started, _full_collections_completed)); |
|
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|
1785 |
|
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|
1786 _full_collections_completed += 1; |
|
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|
1787 |
|
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|
1788 // This notify_all() will ensure that a thread that called |
|
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|
1789 // System.gc() with (with ExplicitGCInvokesConcurrent set or not) |
|
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1790 // and it's waiting for a full GC to finish will be woken up. It is |
|
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1791 // waiting in VM_G1IncCollectionPause::doit_epilogue(). |
|
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|
1792 FullGCCount_lock->notify_all(); |
|
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|
1793 } |
|
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|
1794 |
| 342 | 1795 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { |
| 1796 assert(Thread::current()->is_VM_thread(), "Precondition#1"); | |
| 1797 assert(Heap_lock->is_locked(), "Precondition#2"); | |
| 1798 GCCauseSetter gcs(this, cause); | |
| 1799 switch (cause) { | |
| 1800 case GCCause::_heap_inspection: | |
| 1801 case GCCause::_heap_dump: { | |
| 1802 HandleMark hm; | |
| 1803 do_full_collection(false); // don't clear all soft refs | |
| 1804 break; | |
| 1805 } | |
| 1806 default: // XXX FIX ME | |
| 1807 ShouldNotReachHere(); // Unexpected use of this function | |
| 1808 } | |
| 1809 } | |
| 1810 | |
|
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1811 void G1CollectedHeap::collect(GCCause::Cause cause) { |
|
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1812 // The caller doesn't have the Heap_lock |
|
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|
1813 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); |
|
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|
1814 |
|
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1815 unsigned int gc_count_before; |
|
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|
1816 unsigned int full_gc_count_before; |
| 342 | 1817 { |
|
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|
1818 MutexLocker ml(Heap_lock); |
|
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1819 // Read the GC count while holding the Heap_lock |
|
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1820 gc_count_before = SharedHeap::heap()->total_collections(); |
|
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1821 full_gc_count_before = SharedHeap::heap()->total_full_collections(); |
|
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1822 |
|
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1823 // Don't want to do a GC until cleanup is completed. |
|
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|
1824 wait_for_cleanup_complete(); |
|
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1825 |
|
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1826 // We give up heap lock; VMThread::execute gets it back below |
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1827 } |
|
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1828 |
|
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1829 if (should_do_concurrent_full_gc(cause)) { |
|
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1830 // Schedule an initial-mark evacuation pause that will start a |
|
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1831 // concurrent cycle. |
|
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1832 VM_G1IncCollectionPause op(gc_count_before, |
|
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1833 true, /* should_initiate_conc_mark */ |
|
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|
1834 g1_policy()->max_pause_time_ms(), |
|
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1835 cause); |
|
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|
1836 VMThread::execute(&op); |
|
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1837 } else { |
|
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1838 if (cause == GCCause::_gc_locker |
|
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1839 DEBUG_ONLY(|| cause == GCCause::_scavenge_alot)) { |
|
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|
1840 |
|
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|
1841 // Schedule a standard evacuation pause. |
|
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|
1842 VM_G1IncCollectionPause op(gc_count_before, |
|
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1843 false, /* should_initiate_conc_mark */ |
|
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1844 g1_policy()->max_pause_time_ms(), |
|
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|
1845 cause); |
|
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|
1846 VMThread::execute(&op); |
|
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1847 } else { |
|
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|
1848 // Schedule a Full GC. |
|
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|
1849 VM_G1CollectFull op(gc_count_before, full_gc_count_before, cause); |
|
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1850 VMThread::execute(&op); |
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1851 } |
| 342 | 1852 } |
| 1853 } | |
| 1854 | |
| 1855 bool G1CollectedHeap::is_in(const void* p) const { | |
| 1856 if (_g1_committed.contains(p)) { | |
| 1857 HeapRegion* hr = _hrs->addr_to_region(p); | |
| 1858 return hr->is_in(p); | |
| 1859 } else { | |
| 1860 return _perm_gen->as_gen()->is_in(p); | |
| 1861 } | |
| 1862 } | |
| 1863 | |
| 1864 // Iteration functions. | |
| 1865 | |
| 1866 // Iterates an OopClosure over all ref-containing fields of objects | |
| 1867 // within a HeapRegion. | |
| 1868 | |
| 1869 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
| 1870 MemRegion _mr; | |
| 1871 OopClosure* _cl; | |
| 1872 public: | |
| 1873 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
| 1874 : _mr(mr), _cl(cl) {} | |
| 1875 bool doHeapRegion(HeapRegion* r) { | |
| 1876 if (! r->continuesHumongous()) { | |
| 1877 r->oop_iterate(_cl); | |
| 1878 } | |
| 1879 return false; | |
| 1880 } | |
| 1881 }; | |
| 1882 | |
| 678 | 1883 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
| 342 | 1884 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
| 1885 _hrs->iterate(&blk); | |
| 678 | 1886 if (do_perm) { |
| 1887 perm_gen()->oop_iterate(cl); | |
| 1888 } | |
| 342 | 1889 } |
| 1890 | |
| 678 | 1891 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
| 342 | 1892 IterateOopClosureRegionClosure blk(mr, cl); |
| 1893 _hrs->iterate(&blk); | |
| 678 | 1894 if (do_perm) { |
| 1895 perm_gen()->oop_iterate(cl); | |
| 1896 } | |
| 342 | 1897 } |
| 1898 | |
| 1899 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
| 1900 | |
| 1901 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
| 1902 ObjectClosure* _cl; | |
| 1903 public: | |
| 1904 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
| 1905 bool doHeapRegion(HeapRegion* r) { | |
| 1906 if (! r->continuesHumongous()) { | |
| 1907 r->object_iterate(_cl); | |
| 1908 } | |
| 1909 return false; | |
| 1910 } | |
| 1911 }; | |
| 1912 | |
| 678 | 1913 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
| 342 | 1914 IterateObjectClosureRegionClosure blk(cl); |
| 1915 _hrs->iterate(&blk); | |
| 678 | 1916 if (do_perm) { |
| 1917 perm_gen()->object_iterate(cl); | |
| 1918 } | |
| 342 | 1919 } |
| 1920 | |
| 1921 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
| 1922 // FIXME: is this right? | |
| 1923 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
| 1924 } | |
| 1925 | |
| 1926 // Calls a SpaceClosure on a HeapRegion. | |
| 1927 | |
| 1928 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
| 1929 SpaceClosure* _cl; | |
| 1930 public: | |
| 1931 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
| 1932 bool doHeapRegion(HeapRegion* r) { | |
| 1933 _cl->do_space(r); | |
| 1934 return false; | |
| 1935 } | |
| 1936 }; | |
| 1937 | |
| 1938 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
| 1939 SpaceClosureRegionClosure blk(cl); | |
| 1940 _hrs->iterate(&blk); | |
| 1941 } | |
| 1942 | |
| 1943 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) { | |
| 1944 _hrs->iterate(cl); | |
| 1945 } | |
| 1946 | |
| 1947 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
| 1948 HeapRegionClosure* cl) { | |
| 1949 _hrs->iterate_from(r, cl); | |
| 1950 } | |
| 1951 | |
| 1952 void | |
| 1953 G1CollectedHeap::heap_region_iterate_from(int idx, HeapRegionClosure* cl) { | |
| 1954 _hrs->iterate_from(idx, cl); | |
| 1955 } | |
| 1956 | |
| 1957 HeapRegion* G1CollectedHeap::region_at(size_t idx) { return _hrs->at(idx); } | |
| 1958 | |
| 1959 void | |
| 1960 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
| 1961 int worker, | |
| 1962 jint claim_value) { | |
| 355 | 1963 const size_t regions = n_regions(); |
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1964 const size_t worker_num = (G1CollectedHeap::use_parallel_gc_threads() ? ParallelGCThreads : 1); |
| 355 | 1965 // try to spread out the starting points of the workers |
| 1966 const size_t start_index = regions / worker_num * (size_t) worker; | |
| 1967 | |
| 1968 // each worker will actually look at all regions | |
| 1969 for (size_t count = 0; count < regions; ++count) { | |
| 1970 const size_t index = (start_index + count) % regions; | |
| 1971 assert(0 <= index && index < regions, "sanity"); | |
| 1972 HeapRegion* r = region_at(index); | |
| 1973 // we'll ignore "continues humongous" regions (we'll process them | |
| 1974 // when we come across their corresponding "start humongous" | |
| 1975 // region) and regions already claimed | |
| 1976 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
| 1977 continue; | |
| 1978 } | |
| 1979 // OK, try to claim it | |
| 342 | 1980 if (r->claimHeapRegion(claim_value)) { |
| 355 | 1981 // success! |
| 1982 assert(!r->continuesHumongous(), "sanity"); | |
| 1983 if (r->startsHumongous()) { | |
| 1984 // If the region is "starts humongous" we'll iterate over its | |
| 1985 // "continues humongous" first; in fact we'll do them | |
| 1986 // first. The order is important. In on case, calling the | |
| 1987 // closure on the "starts humongous" region might de-allocate | |
| 1988 // and clear all its "continues humongous" regions and, as a | |
| 1989 // result, we might end up processing them twice. So, we'll do | |
| 1990 // them first (notice: most closures will ignore them anyway) and | |
| 1991 // then we'll do the "starts humongous" region. | |
| 1992 for (size_t ch_index = index + 1; ch_index < regions; ++ch_index) { | |
| 1993 HeapRegion* chr = region_at(ch_index); | |
| 1994 | |
| 1995 // if the region has already been claimed or it's not | |
| 1996 // "continues humongous" we're done | |
| 1997 if (chr->claim_value() == claim_value || | |
| 1998 !chr->continuesHumongous()) { | |
| 1999 break; | |
| 2000 } | |
| 2001 | |
| 2002 // Noone should have claimed it directly. We can given | |
| 2003 // that we claimed its "starts humongous" region. | |
| 2004 assert(chr->claim_value() != claim_value, "sanity"); | |
| 2005 assert(chr->humongous_start_region() == r, "sanity"); | |
| 2006 | |
| 2007 if (chr->claimHeapRegion(claim_value)) { | |
| 2008 // we should always be able to claim it; noone else should | |
| 2009 // be trying to claim this region | |
| 2010 | |
| 2011 bool res2 = cl->doHeapRegion(chr); | |
| 2012 assert(!res2, "Should not abort"); | |
| 2013 | |
| 2014 // Right now, this holds (i.e., no closure that actually | |
| 2015 // does something with "continues humongous" regions | |
| 2016 // clears them). We might have to weaken it in the future, | |
| 2017 // but let's leave these two asserts here for extra safety. | |
| 2018 assert(chr->continuesHumongous(), "should still be the case"); | |
| 2019 assert(chr->humongous_start_region() == r, "sanity"); | |
| 2020 } else { | |
| 2021 guarantee(false, "we should not reach here"); | |
| 2022 } | |
| 2023 } | |
| 2024 } | |
| 2025 | |
| 2026 assert(!r->continuesHumongous(), "sanity"); | |
| 2027 bool res = cl->doHeapRegion(r); | |
| 2028 assert(!res, "Should not abort"); | |
| 2029 } | |
| 2030 } | |
| 2031 } | |
| 2032 | |
| 390 | 2033 class ResetClaimValuesClosure: public HeapRegionClosure { |
| 2034 public: | |
| 2035 bool doHeapRegion(HeapRegion* r) { | |
| 2036 r->set_claim_value(HeapRegion::InitialClaimValue); | |
| 2037 return false; | |
| 2038 } | |
| 2039 }; | |
| 2040 | |
| 2041 void | |
| 2042 G1CollectedHeap::reset_heap_region_claim_values() { | |
| 2043 ResetClaimValuesClosure blk; | |
| 2044 heap_region_iterate(&blk); | |
| 2045 } | |
| 2046 | |
| 355 | 2047 #ifdef ASSERT |
| 2048 // This checks whether all regions in the heap have the correct claim | |
| 2049 // value. I also piggy-backed on this a check to ensure that the | |
| 2050 // humongous_start_region() information on "continues humongous" | |
| 2051 // regions is correct. | |
| 2052 | |
| 2053 class CheckClaimValuesClosure : public HeapRegionClosure { | |
| 2054 private: | |
| 2055 jint _claim_value; | |
| 2056 size_t _failures; | |
| 2057 HeapRegion* _sh_region; | |
| 2058 public: | |
| 2059 CheckClaimValuesClosure(jint claim_value) : | |
| 2060 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
| 2061 bool doHeapRegion(HeapRegion* r) { | |
| 2062 if (r->claim_value() != _claim_value) { | |
| 2063 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
| 2064 "claim value = %d, should be %d", | |
| 2065 r->bottom(), r->end(), r->claim_value(), | |
| 2066 _claim_value); | |
| 2067 ++_failures; | |
| 2068 } | |
| 2069 if (!r->isHumongous()) { | |
| 2070 _sh_region = NULL; | |
| 2071 } else if (r->startsHumongous()) { | |
| 2072 _sh_region = r; | |
| 2073 } else if (r->continuesHumongous()) { | |
| 2074 if (r->humongous_start_region() != _sh_region) { | |
| 2075 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
| 2076 "HS = "PTR_FORMAT", should be "PTR_FORMAT, | |
| 2077 r->bottom(), r->end(), | |
| 2078 r->humongous_start_region(), | |
| 2079 _sh_region); | |
| 2080 ++_failures; | |
| 342 | 2081 } |
| 2082 } | |
| 355 | 2083 return false; |
| 2084 } | |
| 2085 size_t failures() { | |
| 2086 return _failures; | |
| 2087 } | |
| 2088 }; | |
| 2089 | |
| 2090 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
| 2091 CheckClaimValuesClosure cl(claim_value); | |
| 2092 heap_region_iterate(&cl); | |
| 2093 return cl.failures() == 0; | |
| 2094 } | |
| 2095 #endif // ASSERT | |
| 342 | 2096 |
| 2097 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { | |
| 2098 HeapRegion* r = g1_policy()->collection_set(); | |
| 2099 while (r != NULL) { | |
| 2100 HeapRegion* next = r->next_in_collection_set(); | |
| 2101 if (cl->doHeapRegion(r)) { | |
| 2102 cl->incomplete(); | |
| 2103 return; | |
| 2104 } | |
| 2105 r = next; | |
| 2106 } | |
| 2107 } | |
| 2108 | |
| 2109 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
| 2110 HeapRegionClosure *cl) { | |
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2111 if (r == NULL) { |
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2112 // The CSet is empty so there's nothing to do. |
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2113 return; |
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2114 } |
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2115 |
| 342 | 2116 assert(r->in_collection_set(), |
| 2117 "Start region must be a member of the collection set."); | |
| 2118 HeapRegion* cur = r; | |
| 2119 while (cur != NULL) { | |
| 2120 HeapRegion* next = cur->next_in_collection_set(); | |
| 2121 if (cl->doHeapRegion(cur) && false) { | |
| 2122 cl->incomplete(); | |
| 2123 return; | |
| 2124 } | |
| 2125 cur = next; | |
| 2126 } | |
| 2127 cur = g1_policy()->collection_set(); | |
| 2128 while (cur != r) { | |
| 2129 HeapRegion* next = cur->next_in_collection_set(); | |
| 2130 if (cl->doHeapRegion(cur) && false) { | |
| 2131 cl->incomplete(); | |
| 2132 return; | |
| 2133 } | |
| 2134 cur = next; | |
| 2135 } | |
| 2136 } | |
| 2137 | |
| 2138 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
| 2139 return _hrs->length() > 0 ? _hrs->at(0) : NULL; | |
| 2140 } | |
| 2141 | |
| 2142 | |
| 2143 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
| 2144 Space* res = heap_region_containing(addr); | |
| 2145 if (res == NULL) | |
| 2146 res = perm_gen()->space_containing(addr); | |
| 2147 return res; | |
| 2148 } | |
| 2149 | |
| 2150 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
| 2151 Space* sp = space_containing(addr); | |
| 2152 if (sp != NULL) { | |
| 2153 return sp->block_start(addr); | |
| 2154 } | |
| 2155 return NULL; | |
| 2156 } | |
| 2157 | |
| 2158 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
| 2159 Space* sp = space_containing(addr); | |
| 2160 assert(sp != NULL, "block_size of address outside of heap"); | |
| 2161 return sp->block_size(addr); | |
| 2162 } | |
| 2163 | |
| 2164 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
| 2165 Space* sp = space_containing(addr); | |
| 2166 return sp->block_is_obj(addr); | |
| 2167 } | |
| 2168 | |
| 2169 bool G1CollectedHeap::supports_tlab_allocation() const { | |
| 2170 return true; | |
| 2171 } | |
| 2172 | |
| 2173 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
| 2174 return HeapRegion::GrainBytes; | |
| 2175 } | |
| 2176 | |
| 2177 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
| 2178 // Return the remaining space in the cur alloc region, but not less than | |
| 2179 // the min TLAB size. | |
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2180 |
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2181 // Also, this value can be at most the humongous object threshold, |
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2182 // since we can't allow tlabs to grow big enough to accomodate |
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2183 // humongous objects. |
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2184 |
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2185 // We need to store the cur alloc region locally, since it might change |
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2186 // between when we test for NULL and when we use it later. |
| 342 | 2187 ContiguousSpace* cur_alloc_space = _cur_alloc_region; |
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2188 size_t max_tlab_size = _humongous_object_threshold_in_words * wordSize; |
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2189 |
| 342 | 2190 if (cur_alloc_space == NULL) { |
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2191 return max_tlab_size; |
| 342 | 2192 } else { |
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2193 return MIN2(MAX2(cur_alloc_space->free(), (size_t)MinTLABSize), |
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2194 max_tlab_size); |
| 342 | 2195 } |
| 2196 } | |
| 2197 | |
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2198 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t word_size) { |
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2199 assert(!isHumongous(word_size), |
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2200 err_msg("a TLAB should not be of humongous size, " |
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2201 "word_size = "SIZE_FORMAT, word_size)); |
| 342 | 2202 bool dummy; |
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2203 return G1CollectedHeap::mem_allocate(word_size, false, true, &dummy); |
| 342 | 2204 } |
| 2205 | |
| 2206 bool G1CollectedHeap::allocs_are_zero_filled() { | |
| 2207 return false; | |
| 2208 } | |
| 2209 | |
| 2210 size_t G1CollectedHeap::large_typearray_limit() { | |
| 2211 // FIXME | |
| 2212 return HeapRegion::GrainBytes/HeapWordSize; | |
| 2213 } | |
| 2214 | |
| 2215 size_t G1CollectedHeap::max_capacity() const { | |
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2216 return g1_reserved_obj_bytes(); |
| 342 | 2217 } |
| 2218 | |
| 2219 jlong G1CollectedHeap::millis_since_last_gc() { | |
| 2220 // assert(false, "NYI"); | |
| 2221 return 0; | |
| 2222 } | |
| 2223 | |
| 2224 | |
| 2225 void G1CollectedHeap::prepare_for_verify() { | |
| 2226 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
| 2227 ensure_parsability(false); | |
| 2228 } | |
| 2229 g1_rem_set()->prepare_for_verify(); | |
| 2230 } | |
| 2231 | |
| 2232 class VerifyLivenessOopClosure: public OopClosure { | |
| 2233 G1CollectedHeap* g1h; | |
| 2234 public: | |
| 2235 VerifyLivenessOopClosure(G1CollectedHeap* _g1h) { | |
| 2236 g1h = _g1h; | |
| 2237 } | |
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2238 void do_oop(narrowOop *p) { do_oop_work(p); } |
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2239 void do_oop( oop *p) { do_oop_work(p); } |
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2240 |
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2241 template <class T> void do_oop_work(T *p) { |
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2242 oop obj = oopDesc::load_decode_heap_oop(p); |
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2243 guarantee(obj == NULL || !g1h->is_obj_dead(obj), |
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2244 "Dead object referenced by a not dead object"); |
| 342 | 2245 } |
| 2246 }; | |
| 2247 | |
| 2248 class VerifyObjsInRegionClosure: public ObjectClosure { | |
| 811 | 2249 private: |
| 342 | 2250 G1CollectedHeap* _g1h; |
| 2251 size_t _live_bytes; | |
| 2252 HeapRegion *_hr; | |
| 811 | 2253 bool _use_prev_marking; |
| 342 | 2254 public: |
| 811 | 2255 // use_prev_marking == true -> use "prev" marking information, |
| 2256 // use_prev_marking == false -> use "next" marking information | |
| 2257 VerifyObjsInRegionClosure(HeapRegion *hr, bool use_prev_marking) | |
| 2258 : _live_bytes(0), _hr(hr), _use_prev_marking(use_prev_marking) { | |
| 342 | 2259 _g1h = G1CollectedHeap::heap(); |
| 2260 } | |
| 2261 void do_object(oop o) { | |
| 2262 VerifyLivenessOopClosure isLive(_g1h); | |
| 2263 assert(o != NULL, "Huh?"); | |
| 811 | 2264 if (!_g1h->is_obj_dead_cond(o, _use_prev_marking)) { |
| 342 | 2265 o->oop_iterate(&isLive); |
|
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2266 if (!_hr->obj_allocated_since_prev_marking(o)) { |
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2267 size_t obj_size = o->size(); // Make sure we don't overflow |
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2268 _live_bytes += (obj_size * HeapWordSize); |
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2269 } |
| 342 | 2270 } |
| 2271 } | |
| 2272 size_t live_bytes() { return _live_bytes; } | |
| 2273 }; | |
| 2274 | |
| 2275 class PrintObjsInRegionClosure : public ObjectClosure { | |
| 2276 HeapRegion *_hr; | |
| 2277 G1CollectedHeap *_g1; | |
| 2278 public: | |
| 2279 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
| 2280 _g1 = G1CollectedHeap::heap(); | |
| 2281 }; | |
| 2282 | |
| 2283 void do_object(oop o) { | |
| 2284 if (o != NULL) { | |
| 2285 HeapWord *start = (HeapWord *) o; | |
| 2286 size_t word_sz = o->size(); | |
| 2287 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
| 2288 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
| 2289 (void*) o, word_sz, | |
| 2290 _g1->isMarkedPrev(o), | |
| 2291 _g1->isMarkedNext(o), | |
| 2292 _hr->obj_allocated_since_prev_marking(o)); | |
| 2293 HeapWord *end = start + word_sz; | |
| 2294 HeapWord *cur; | |
| 2295 int *val; | |
| 2296 for (cur = start; cur < end; cur++) { | |
| 2297 val = (int *) cur; | |
| 2298 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
| 2299 } | |
| 2300 } | |
| 2301 } | |
| 2302 }; | |
| 2303 | |
| 2304 class VerifyRegionClosure: public HeapRegionClosure { | |
| 811 | 2305 private: |
| 342 | 2306 bool _allow_dirty; |
| 390 | 2307 bool _par; |
| 811 | 2308 bool _use_prev_marking; |
|
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2309 bool _failures; |
| 811 | 2310 public: |
| 2311 // use_prev_marking == true -> use "prev" marking information, | |
| 2312 // use_prev_marking == false -> use "next" marking information | |
| 2313 VerifyRegionClosure(bool allow_dirty, bool par, bool use_prev_marking) | |
|
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2314 : _allow_dirty(allow_dirty), |
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2315 _par(par), |
|
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2316 _use_prev_marking(use_prev_marking), |
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2317 _failures(false) {} |
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2318 |
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2319 bool failures() { |
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2320 return _failures; |
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2321 } |
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2322 |
| 342 | 2323 bool doHeapRegion(HeapRegion* r) { |
| 390 | 2324 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
| 2325 "Should be unclaimed at verify points."); | |
|
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2326 if (!r->continuesHumongous()) { |
|
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2327 bool failures = false; |
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2328 r->verify(_allow_dirty, _use_prev_marking, &failures); |
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2329 if (failures) { |
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2330 _failures = true; |
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2331 } else { |
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2332 VerifyObjsInRegionClosure not_dead_yet_cl(r, _use_prev_marking); |
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2333 r->object_iterate(¬_dead_yet_cl); |
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2334 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) { |
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2335 gclog_or_tty->print_cr("["PTR_FORMAT","PTR_FORMAT"] " |
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2336 "max_live_bytes "SIZE_FORMAT" " |
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2337 "< calculated "SIZE_FORMAT, |
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2338 r->bottom(), r->end(), |
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2339 r->max_live_bytes(), |
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2340 not_dead_yet_cl.live_bytes()); |
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2341 _failures = true; |
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2342 } |
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2343 } |
| 342 | 2344 } |
|
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2345 return false; // stop the region iteration if we hit a failure |
| 342 | 2346 } |
| 2347 }; | |
| 2348 | |
| 2349 class VerifyRootsClosure: public OopsInGenClosure { | |
| 2350 private: | |
| 2351 G1CollectedHeap* _g1h; | |
|
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2352 bool _use_prev_marking; |
| 342 | 2353 bool _failures; |
| 2354 public: | |
| 811 | 2355 // use_prev_marking == true -> use "prev" marking information, |
| 2356 // use_prev_marking == false -> use "next" marking information | |
| 2357 VerifyRootsClosure(bool use_prev_marking) : | |
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2358 _g1h(G1CollectedHeap::heap()), |
|
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2359 _use_prev_marking(use_prev_marking), |
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2360 _failures(false) { } |
| 342 | 2361 |
| 2362 bool failures() { return _failures; } | |
| 2363 | |
|
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2364 template <class T> void do_oop_nv(T* p) { |
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2365 T heap_oop = oopDesc::load_heap_oop(p); |
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2366 if (!oopDesc::is_null(heap_oop)) { |
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2367 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
| 811 | 2368 if (_g1h->is_obj_dead_cond(obj, _use_prev_marking)) { |
| 342 | 2369 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
|
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2370 "points to dead obj "PTR_FORMAT, p, (void*) obj); |
| 342 | 2371 obj->print_on(gclog_or_tty); |
| 2372 _failures = true; | |
| 2373 } | |
| 2374 } | |
| 2375 } | |
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2376 |
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2377 void do_oop(oop* p) { do_oop_nv(p); } |
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2378 void do_oop(narrowOop* p) { do_oop_nv(p); } |
| 342 | 2379 }; |
| 2380 | |
| 390 | 2381 // This is the task used for parallel heap verification. |
| 2382 | |
| 2383 class G1ParVerifyTask: public AbstractGangTask { | |
| 2384 private: | |
| 2385 G1CollectedHeap* _g1h; | |
| 2386 bool _allow_dirty; | |
| 811 | 2387 bool _use_prev_marking; |
|
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2388 bool _failures; |
| 390 | 2389 |
| 2390 public: | |
| 811 | 2391 // use_prev_marking == true -> use "prev" marking information, |
| 2392 // use_prev_marking == false -> use "next" marking information | |
| 2393 G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty, | |
| 2394 bool use_prev_marking) : | |
| 390 | 2395 AbstractGangTask("Parallel verify task"), |
|
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2396 _g1h(g1h), |
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2397 _allow_dirty(allow_dirty), |
|
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2398 _use_prev_marking(use_prev_marking), |
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2399 _failures(false) { } |
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2400 |
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|
2401 bool failures() { |
|
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2402 return _failures; |
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|
2403 } |
| 390 | 2404 |
| 2405 void work(int worker_i) { | |
|
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2406 HandleMark hm; |
| 811 | 2407 VerifyRegionClosure blk(_allow_dirty, true, _use_prev_marking); |
| 390 | 2408 _g1h->heap_region_par_iterate_chunked(&blk, worker_i, |
| 2409 HeapRegion::ParVerifyClaimValue); | |
|
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2410 if (blk.failures()) { |
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2411 _failures = true; |
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|
2412 } |
| 390 | 2413 } |
| 2414 }; | |
| 2415 | |
| 342 | 2416 void G1CollectedHeap::verify(bool allow_dirty, bool silent) { |
| 811 | 2417 verify(allow_dirty, silent, /* use_prev_marking */ true); |
| 2418 } | |
| 2419 | |
| 2420 void G1CollectedHeap::verify(bool allow_dirty, | |
| 2421 bool silent, | |
| 2422 bool use_prev_marking) { | |
| 342 | 2423 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
| 2424 if (!silent) { gclog_or_tty->print("roots "); } | |
| 811 | 2425 VerifyRootsClosure rootsCl(use_prev_marking); |
|
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2426 CodeBlobToOopClosure blobsCl(&rootsCl, /*do_marking=*/ false); |
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2427 process_strong_roots(true, // activate StrongRootsScope |
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2428 false, |
| 342 | 2429 SharedHeap::SO_AllClasses, |
| 2430 &rootsCl, | |
|
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2431 &blobsCl, |
| 342 | 2432 &rootsCl); |
|
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2433 bool failures = rootsCl.failures(); |
| 342 | 2434 rem_set()->invalidate(perm_gen()->used_region(), false); |
| 2435 if (!silent) { gclog_or_tty->print("heapRegions "); } | |
| 390 | 2436 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
| 2437 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 2438 "sanity check"); | |
| 2439 | |
| 811 | 2440 G1ParVerifyTask task(this, allow_dirty, use_prev_marking); |
| 390 | 2441 int n_workers = workers()->total_workers(); |
| 2442 set_par_threads(n_workers); | |
| 2443 workers()->run_task(&task); | |
| 2444 set_par_threads(0); | |
|
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2445 if (task.failures()) { |
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2446 failures = true; |
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2447 } |
| 390 | 2448 |
| 2449 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), | |
| 2450 "sanity check"); | |
| 2451 | |
| 2452 reset_heap_region_claim_values(); | |
| 2453 | |
| 2454 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 2455 "sanity check"); | |
| 2456 } else { | |
| 811 | 2457 VerifyRegionClosure blk(allow_dirty, false, use_prev_marking); |
| 390 | 2458 _hrs->iterate(&blk); |
|
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2459 if (blk.failures()) { |
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2460 failures = true; |
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|
2461 } |
| 390 | 2462 } |
| 342 | 2463 if (!silent) gclog_or_tty->print("remset "); |
| 2464 rem_set()->verify(); | |
|
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2465 |
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2466 if (failures) { |
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2467 gclog_or_tty->print_cr("Heap:"); |
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2468 print_on(gclog_or_tty, true /* extended */); |
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2469 gclog_or_tty->print_cr(""); |
|
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2470 #ifndef PRODUCT |
| 1044 | 2471 if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) { |
| 1388 | 2472 concurrent_mark()->print_reachable("at-verification-failure", |
| 2473 use_prev_marking, false /* all */); | |
|
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2474 } |
|
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2475 #endif |
|
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|
2476 gclog_or_tty->flush(); |
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2477 } |
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2478 guarantee(!failures, "there should not have been any failures"); |
| 342 | 2479 } else { |
| 2480 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
| 2481 } | |
| 2482 } | |
| 2483 | |
| 2484 class PrintRegionClosure: public HeapRegionClosure { | |
| 2485 outputStream* _st; | |
| 2486 public: | |
| 2487 PrintRegionClosure(outputStream* st) : _st(st) {} | |
| 2488 bool doHeapRegion(HeapRegion* r) { | |
| 2489 r->print_on(_st); | |
| 2490 return false; | |
| 2491 } | |
| 2492 }; | |
| 2493 | |
|
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|
2494 void G1CollectedHeap::print() const { print_on(tty); } |
| 342 | 2495 |
| 2496 void G1CollectedHeap::print_on(outputStream* st) const { | |
|
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2497 print_on(st, PrintHeapAtGCExtended); |
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2498 } |
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2499 |
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2500 void G1CollectedHeap::print_on(outputStream* st, bool extended) const { |
|
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2501 st->print(" %-20s", "garbage-first heap"); |
|
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2502 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
|
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2503 capacity()/K, used_unlocked()/K); |
|
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2504 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
|
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2505 _g1_storage.low_boundary(), |
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2506 _g1_storage.high(), |
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2507 _g1_storage.high_boundary()); |
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2508 st->cr(); |
|
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2509 st->print(" region size " SIZE_FORMAT "K, ", |
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2510 HeapRegion::GrainBytes/K); |
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2511 size_t young_regions = _young_list->length(); |
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2512 st->print(SIZE_FORMAT " young (" SIZE_FORMAT "K), ", |
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2513 young_regions, young_regions * HeapRegion::GrainBytes / K); |
|
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2514 size_t survivor_regions = g1_policy()->recorded_survivor_regions(); |
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2515 st->print(SIZE_FORMAT " survivors (" SIZE_FORMAT "K)", |
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2516 survivor_regions, survivor_regions * HeapRegion::GrainBytes / K); |
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2517 st->cr(); |
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2518 perm()->as_gen()->print_on(st); |
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2519 if (extended) { |
|
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2520 st->cr(); |
|
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2521 print_on_extended(st); |
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2522 } |
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2523 } |
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2524 |
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2525 void G1CollectedHeap::print_on_extended(outputStream* st) const { |
| 342 | 2526 PrintRegionClosure blk(st); |
| 2527 _hrs->iterate(&blk); | |
| 2528 } | |
| 2529 | |
| 2530 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { | |
|
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2531 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 1019 | 2532 workers()->print_worker_threads_on(st); |
| 2533 } | |
| 2534 | |
| 2535 _cmThread->print_on(st); | |
| 342 | 2536 st->cr(); |
| 1019 | 2537 |
| 2538 _cm->print_worker_threads_on(st); | |
| 2539 | |
| 2540 _cg1r->print_worker_threads_on(st); | |
| 2541 | |
| 342 | 2542 _czft->print_on(st); |
| 2543 st->cr(); | |
| 2544 } | |
| 2545 | |
| 2546 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
|
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2547 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 2548 workers()->threads_do(tc); |
| 2549 } | |
| 2550 tc->do_thread(_cmThread); | |
| 794 | 2551 _cg1r->threads_do(tc); |
| 342 | 2552 tc->do_thread(_czft); |
| 2553 } | |
| 2554 | |
| 2555 void G1CollectedHeap::print_tracing_info() const { | |
| 2556 // We'll overload this to mean "trace GC pause statistics." | |
| 2557 if (TraceGen0Time || TraceGen1Time) { | |
| 2558 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
| 2559 // to that. | |
| 2560 g1_policy()->print_tracing_info(); | |
| 2561 } | |
| 751 | 2562 if (G1SummarizeRSetStats) { |
| 342 | 2563 g1_rem_set()->print_summary_info(); |
| 2564 } | |
| 1282 | 2565 if (G1SummarizeConcMark) { |
| 342 | 2566 concurrent_mark()->print_summary_info(); |
| 2567 } | |
| 751 | 2568 if (G1SummarizeZFStats) { |
| 342 | 2569 ConcurrentZFThread::print_summary_info(); |
| 2570 } | |
| 2571 g1_policy()->print_yg_surv_rate_info(); | |
| 2572 | |
| 2573 SpecializationStats::print(); | |
| 2574 } | |
| 2575 | |
| 2576 | |
| 2577 int G1CollectedHeap::addr_to_arena_id(void* addr) const { | |
| 2578 HeapRegion* hr = heap_region_containing(addr); | |
| 2579 if (hr == NULL) { | |
| 2580 return 0; | |
| 2581 } else { | |
| 2582 return 1; | |
| 2583 } | |
| 2584 } | |
| 2585 | |
| 2586 G1CollectedHeap* G1CollectedHeap::heap() { | |
| 2587 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
| 2588 "not a garbage-first heap"); | |
| 2589 return _g1h; | |
| 2590 } | |
| 2591 | |
| 2592 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
|
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2593 // always_do_update_barrier = false; |
| 342 | 2594 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
| 2595 // Call allocation profiler | |
| 2596 AllocationProfiler::iterate_since_last_gc(); | |
| 2597 // Fill TLAB's and such | |
| 2598 ensure_parsability(true); | |
| 2599 } | |
| 2600 | |
| 2601 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
| 2602 // FIXME: what is this about? | |
| 2603 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
| 2604 // is set. | |
| 2605 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
| 2606 "derived pointer present")); | |
|
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2607 // always_do_update_barrier = true; |
| 342 | 2608 } |
| 2609 | |
| 2610 void G1CollectedHeap::do_collection_pause() { | |
|
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2611 assert(Heap_lock->owned_by_self(), "we assume we'reholding the Heap_lock"); |
|
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2612 |
| 342 | 2613 // Read the GC count while holding the Heap_lock |
| 2614 // we need to do this _before_ wait_for_cleanup_complete(), to | |
| 2615 // ensure that we do not give up the heap lock and potentially | |
| 2616 // pick up the wrong count | |
|
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2617 unsigned int gc_count_before = SharedHeap::heap()->total_collections(); |
| 342 | 2618 |
| 2619 // Don't want to do a GC pause while cleanup is being completed! | |
| 2620 wait_for_cleanup_complete(); | |
| 2621 | |
| 2622 g1_policy()->record_stop_world_start(); | |
| 2623 { | |
| 2624 MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back | |
|
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2625 VM_G1IncCollectionPause op(gc_count_before, |
|
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2626 false, /* should_initiate_conc_mark */ |
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2627 g1_policy()->max_pause_time_ms(), |
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2628 GCCause::_g1_inc_collection_pause); |
| 342 | 2629 VMThread::execute(&op); |
| 2630 } | |
| 2631 } | |
| 2632 | |
| 2633 void | |
| 2634 G1CollectedHeap::doConcurrentMark() { | |
|
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2635 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
|
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2636 if (!_cmThread->in_progress()) { |
|
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2637 _cmThread->set_started(); |
|
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|
2638 CGC_lock->notify(); |
| 342 | 2639 } |
| 2640 } | |
| 2641 | |
| 2642 class VerifyMarkedObjsClosure: public ObjectClosure { | |
| 2643 G1CollectedHeap* _g1h; | |
| 2644 public: | |
| 2645 VerifyMarkedObjsClosure(G1CollectedHeap* g1h) : _g1h(g1h) {} | |
| 2646 void do_object(oop obj) { | |
| 2647 assert(obj->mark()->is_marked() ? !_g1h->is_obj_dead(obj) : true, | |
| 2648 "markandsweep mark should agree with concurrent deadness"); | |
| 2649 } | |
| 2650 }; | |
| 2651 | |
| 2652 void | |
| 2653 G1CollectedHeap::checkConcurrentMark() { | |
| 2654 VerifyMarkedObjsClosure verifycl(this); | |
| 2655 // MutexLockerEx x(getMarkBitMapLock(), | |
| 2656 // Mutex::_no_safepoint_check_flag); | |
| 678 | 2657 object_iterate(&verifycl, false); |
| 342 | 2658 } |
| 2659 | |
| 2660 void G1CollectedHeap::do_sync_mark() { | |
| 2661 _cm->checkpointRootsInitial(); | |
| 2662 _cm->markFromRoots(); | |
| 2663 _cm->checkpointRootsFinal(false); | |
| 2664 } | |
| 2665 | |
| 2666 // <NEW PREDICTION> | |
| 2667 | |
| 2668 double G1CollectedHeap::predict_region_elapsed_time_ms(HeapRegion *hr, | |
| 2669 bool young) { | |
| 2670 return _g1_policy->predict_region_elapsed_time_ms(hr, young); | |
| 2671 } | |
| 2672 | |
| 2673 void G1CollectedHeap::check_if_region_is_too_expensive(double | |
| 2674 predicted_time_ms) { | |
| 2675 _g1_policy->check_if_region_is_too_expensive(predicted_time_ms); | |
| 2676 } | |
| 2677 | |
| 2678 size_t G1CollectedHeap::pending_card_num() { | |
| 2679 size_t extra_cards = 0; | |
| 2680 JavaThread *curr = Threads::first(); | |
| 2681 while (curr != NULL) { | |
| 2682 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
| 2683 extra_cards += dcq.size(); | |
| 2684 curr = curr->next(); | |
| 2685 } | |
| 2686 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 2687 size_t buffer_size = dcqs.buffer_size(); | |
| 2688 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 2689 return buffer_size * buffer_num + extra_cards; | |
| 2690 } | |
| 2691 | |
| 2692 size_t G1CollectedHeap::max_pending_card_num() { | |
| 2693 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 2694 size_t buffer_size = dcqs.buffer_size(); | |
| 2695 size_t buffer_num = dcqs.completed_buffers_num(); | |
| 2696 int thread_num = Threads::number_of_threads(); | |
| 2697 return (buffer_num + thread_num) * buffer_size; | |
| 2698 } | |
| 2699 | |
| 2700 size_t G1CollectedHeap::cards_scanned() { | |
| 2701 HRInto_G1RemSet* g1_rset = (HRInto_G1RemSet*) g1_rem_set(); | |
| 2702 return g1_rset->cardsScanned(); | |
| 2703 } | |
| 2704 | |
| 2705 void | |
| 2706 G1CollectedHeap::setup_surviving_young_words() { | |
| 2707 guarantee( _surviving_young_words == NULL, "pre-condition" ); | |
| 2708 size_t array_length = g1_policy()->young_cset_length(); | |
| 2709 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, array_length); | |
| 2710 if (_surviving_young_words == NULL) { | |
| 2711 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
| 2712 "Not enough space for young surv words summary."); | |
| 2713 } | |
| 2714 memset(_surviving_young_words, 0, array_length * sizeof(size_t)); | |
|
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2715 #ifdef ASSERT |
| 342 | 2716 for (size_t i = 0; i < array_length; ++i) { |
|
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2717 assert( _surviving_young_words[i] == 0, "memset above" ); |
|
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2718 } |
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2719 #endif // !ASSERT |
| 342 | 2720 } |
| 2721 | |
| 2722 void | |
| 2723 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
| 2724 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 2725 size_t array_length = g1_policy()->young_cset_length(); | |
| 2726 for (size_t i = 0; i < array_length; ++i) | |
| 2727 _surviving_young_words[i] += surv_young_words[i]; | |
| 2728 } | |
| 2729 | |
| 2730 void | |
| 2731 G1CollectedHeap::cleanup_surviving_young_words() { | |
| 2732 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
| 2733 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
| 2734 _surviving_young_words = NULL; | |
| 2735 } | |
| 2736 | |
| 2737 // </NEW PREDICTION> | |
| 2738 | |
|
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2739 struct PrepareForRSScanningClosure : public HeapRegionClosure { |
|
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2740 bool doHeapRegion(HeapRegion *r) { |
|
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2741 r->rem_set()->set_iter_claimed(0); |
|
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2742 return false; |
|
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2743 } |
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2744 }; |
|
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2745 |
| 1709 | 2746 #if TASKQUEUE_STATS |
| 2747 void G1CollectedHeap::print_taskqueue_stats_hdr(outputStream* const st) { | |
| 2748 st->print_raw_cr("GC Task Stats"); | |
| 2749 st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); | |
| 2750 st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); | |
| 2751 } | |
| 2752 | |
| 2753 void G1CollectedHeap::print_taskqueue_stats(outputStream* const st) const { | |
| 2754 print_taskqueue_stats_hdr(st); | |
| 2755 | |
| 2756 TaskQueueStats totals; | |
|
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2757 const int n = workers() != NULL ? workers()->total_workers() : 1; |
| 1709 | 2758 for (int i = 0; i < n; ++i) { |
| 2759 st->print("%3d ", i); task_queue(i)->stats.print(st); st->cr(); | |
| 2760 totals += task_queue(i)->stats; | |
| 2761 } | |
| 2762 st->print_raw("tot "); totals.print(st); st->cr(); | |
| 2763 | |
| 2764 DEBUG_ONLY(totals.verify()); | |
| 2765 } | |
| 2766 | |
| 2767 void G1CollectedHeap::reset_taskqueue_stats() { | |
|
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2768 const int n = workers() != NULL ? workers()->total_workers() : 1; |
| 1709 | 2769 for (int i = 0; i < n; ++i) { |
| 2770 task_queue(i)->stats.reset(); | |
| 2771 } | |
| 2772 } | |
| 2773 #endif // TASKQUEUE_STATS | |
| 2774 | |
| 342 | 2775 void |
|
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2776 G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { |
|
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2777 if (GC_locker::check_active_before_gc()) { |
|
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2778 return; // GC is disabled (e.g. JNI GetXXXCritical operation) |
|
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2779 } |
|
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2780 |
|
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2781 if (PrintHeapAtGC) { |
|
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|
2782 Universe::print_heap_before_gc(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2783 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2784 |
|
0316eac49d5a
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|
2785 { |
|
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
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|
2786 ResourceMark rm; |
|
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
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|
2787 |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1313
diff
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|
2788 // This call will decide whether this pause is an initial-mark |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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diff
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|
2789 // pause. If it is, during_initial_mark_pause() will return true |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2790 // for the duration of this pause. |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2791 g1_policy()->decide_on_conc_mark_initiation(); |
|
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2792 |
|
838
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|
2793 char verbose_str[128]; |
|
0316eac49d5a
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|
2794 sprintf(verbose_str, "GC pause "); |
|
0316eac49d5a
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|
2795 if (g1_policy()->in_young_gc_mode()) { |
|
0316eac49d5a
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|
2796 if (g1_policy()->full_young_gcs()) |
|
0316eac49d5a
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|
2797 strcat(verbose_str, "(young)"); |
|
0316eac49d5a
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|
2798 else |
|
0316eac49d5a
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|
2799 strcat(verbose_str, "(partial)"); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2800 } |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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|
2801 if (g1_policy()->during_initial_mark_pause()) { |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2802 strcat(verbose_str, " (initial-mark)"); |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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|
2803 // We are about to start a marking cycle, so we increment the |
|
4e5661ba9d98
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|
2804 // full collection counter. |
|
4e5661ba9d98
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|
2805 increment_total_full_collections(); |
|
4e5661ba9d98
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|
2806 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2807 |
|
0316eac49d5a
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|
2808 // if PrintGCDetails is on, we'll print long statistics information |
|
0316eac49d5a
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|
2809 // in the collector policy code, so let's not print this as the output |
|
0316eac49d5a
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|
2810 // is messy if we do. |
|
0316eac49d5a
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|
2811 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2812 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2813 TraceTime t(verbose_str, PrintGC && !PrintGCDetails, true, gclog_or_tty); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2814 |
|
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
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|
2815 TraceMemoryManagerStats tms(false /* fullGC */); |
|
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
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|
2816 |
|
838
0316eac49d5a
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|
2817 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2818 assert(Thread::current() == VMThread::vm_thread(), "should be in vm thread"); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2819 guarantee(!is_gc_active(), "collection is not reentrant"); |
|
0316eac49d5a
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|
2820 assert(regions_accounted_for(), "Region leakage!"); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2821 |
|
0316eac49d5a
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|
2822 increment_gc_time_stamp(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2823 |
|
0316eac49d5a
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|
2824 if (g1_policy()->in_young_gc_mode()) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2825 assert(check_young_list_well_formed(), |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2826 "young list should be well formed"); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2827 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2828 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2829 { // Call to jvmpi::post_class_unload_events must occur outside of active GC |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2830 IsGCActiveMark x; |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2831 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2832 gc_prologue(false); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2833 increment_total_collections(false /* full gc */); |
| 342 | 2834 |
| 2835 #if G1_REM_SET_LOGGING | |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
2836 gclog_or_tty->print_cr("\nJust chose CS, heap:"); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2837 print(); |
| 342 | 2838 #endif |
| 2839 | |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2840 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2841 HandleMark hm; // Discard invalid handles created during verification |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2842 prepare_for_verify(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2843 gclog_or_tty->print(" VerifyBeforeGC:"); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
2844 Universe::verify(false); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2845 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2846 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2847 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
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|
2848 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
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diff
changeset
|
2849 // 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
|
2850 // 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
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811
diff
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|
2851 bool was_enabled = ref_processor()->discovery_enabled(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
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|
2852 if (was_enabled) ref_processor()->disable_discovery(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
2853 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
changeset
|
2854 // 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
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|
2855 // of the collection set!). |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2856 abandon_cur_alloc_region(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
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|
2857 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
2858 // The elapsed time induced by the start time below deliberately elides |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
2859 // the possible verification above. |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
2860 double start_time_sec = os::elapsedTime(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
2861 size_t start_used_bytes = used(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
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|
2862 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2863 #if YOUNG_LIST_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2864 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
|
2865 _young_list->print(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2866 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
|
2867 #endif // YOUNG_LIST_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
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|
2868 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2869 g1_policy()->record_collection_pause_start(start_time_sec, |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2870 start_used_bytes); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
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|
2871 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2872 #if YOUNG_LIST_VERBOSE |
|
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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|
2873 gclog_or_tty->print_cr("\nAfter recording pause start.\nYoung_list:"); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2874 _young_list->print(); |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2875 #endif // YOUNG_LIST_VERBOSE |
| 342 | 2876 |
|
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1313
diff
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|
2877 if (g1_policy()->during_initial_mark_pause()) { |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2878 concurrent_mark()->checkpointRootsInitialPre(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
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|
2879 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2880 save_marks(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
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|
2881 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
2882 // 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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|
2883 // marks. |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2884 if (mark_in_progress()) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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changeset
|
2885 double start_time_sec = os::elapsedTime(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
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|
2886 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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changeset
|
2887 _cm->drainAllSATBBuffers(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
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|
2888 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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changeset
|
2889 g1_policy()->record_satb_drain_time(finish_mark_ms); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
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|
2890 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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changeset
|
2891 // Record the number of elements currently on the mark stack, so we |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
2892 // only iterate over these. (Since evacuation may add to the mark |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
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changeset
|
2893 // 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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811
diff
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|
2894 // progress, this will be zero. |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
2895 _cm->set_oops_do_bound(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
2896 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2897 assert(regions_accounted_for(), "Region leakage."); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2898 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2899 if (mark_in_progress()) |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2900 concurrent_mark()->newCSet(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2901 |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2902 #if YOUNG_LIST_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2903 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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|
2904 _young_list->print(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2905 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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|
2906 #endif // YOUNG_LIST_VERBOSE |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2907 |
| 1707 | 2908 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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|
2909 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2910 // Nothing to do if we were unable to choose a collection set. |
| 342 | 2911 #if G1_REM_SET_LOGGING |
| 1707 | 2912 gclog_or_tty->print_cr("\nAfter pause, heap:"); |
| 2913 print(); | |
| 342 | 2914 #endif |
| 1707 | 2915 PrepareForRSScanningClosure prepare_for_rs_scan; |
| 2916 collection_set_iterate(&prepare_for_rs_scan); | |
| 2917 | |
| 2918 setup_surviving_young_words(); | |
| 2919 | |
| 2920 // Set up the gc allocation regions. | |
| 2921 get_gc_alloc_regions(); | |
| 2922 | |
| 2923 // Actually do the work... | |
| 2924 evacuate_collection_set(); | |
| 2925 | |
| 2926 free_collection_set(g1_policy()->collection_set()); | |
| 2927 g1_policy()->clear_collection_set(); | |
| 2928 | |
| 2929 cleanup_surviving_young_words(); | |
| 2930 | |
| 2931 // Start a new incremental collection set for the next pause. | |
| 2932 g1_policy()->start_incremental_cset_building(); | |
| 2933 | |
| 2934 // Clear the _cset_fast_test bitmap in anticipation of adding | |
| 2935 // regions to the incremental collection set for the next | |
| 2936 // evacuation pause. | |
| 2937 clear_cset_fast_test(); | |
| 2938 | |
| 2939 if (g1_policy()->in_young_gc_mode()) { | |
| 2940 _young_list->reset_sampled_info(); | |
| 2941 | |
| 2942 // Don't check the whole heap at this point as the | |
| 2943 // GC alloc regions from this pause have been tagged | |
| 2944 // as survivors and moved on to the survivor list. | |
| 2945 // Survivor regions will fail the !is_young() check. | |
| 2946 assert(check_young_list_empty(false /* check_heap */), | |
| 2947 "young list should be empty"); | |
|
1394
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2948 |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2949 #if YOUNG_LIST_VERBOSE |
| 1707 | 2950 gclog_or_tty->print_cr("Before recording survivors.\nYoung List:"); |
| 2951 _young_list->print(); | |
|
1394
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|
2952 #endif // YOUNG_LIST_VERBOSE |
| 342 | 2953 |
| 1707 | 2954 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2955 _young_list->first_survivor_region(), |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2956 _young_list->last_survivor_region()); |
|
1394
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|
2957 |
| 1707 | 2958 _young_list->reset_auxilary_lists(); |
| 342 | 2959 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2960 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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changeset
|
2961 if (evacuation_failed()) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2962 _summary_bytes_used = recalculate_used(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2963 } else { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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diff
changeset
|
2964 // 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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|
2965 // when they were freed. Add in the bytes evacuated. |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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changeset
|
2966 _summary_bytes_used += g1_policy()->bytes_in_to_space(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2967 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2968 |
|
0316eac49d5a
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diff
changeset
|
2969 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
|
2970 g1_policy()->during_initial_mark_pause()) { |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
2971 concurrent_mark()->checkpointRootsInitialPost(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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changeset
|
2972 set_marking_started(); |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2973 // CAUTION: after the doConcurrentMark() call below, |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2974 // the concurrent marking thread(s) could be running |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
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diff
changeset
|
2975 // concurrently with us. Make sure that anything after |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
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diff
changeset
|
2976 // this point does not assume that we are the only GC thread |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
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838
diff
changeset
|
2977 // 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
|
2978 // 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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diff
changeset
|
2979 // ConcurrentGCThread::safepoint_desynchronize(). |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
2980 doConcurrentMark(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
2981 } |
| 342 | 2982 |
|
1394
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2983 #if YOUNG_LIST_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2984 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
|
2985 _young_list->print(); |
|
1394
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2986 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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|
2987 #endif // YOUNG_LIST_VERBOSE |
| 342 | 2988 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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changeset
|
2989 double end_time_sec = os::elapsedTime(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
2990 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
|
2991 g1_policy()->record_pause_time_ms(pause_time_ms); |
| 1707 | 2992 g1_policy()->record_collection_pause_end(); |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
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|
2993 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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changeset
|
2994 assert(regions_accounted_for(), "Region leakage."); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2995 |
|
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
2996 MemoryService::track_memory_usage(); |
|
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
2997 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2998 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
2999 HandleMark hm; // Discard invalid handles created during verification |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3000 gclog_or_tty->print(" VerifyAfterGC:"); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
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changeset
|
3001 prepare_for_verify(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3002 Universe::verify(false); |
| 342 | 3003 } |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3004 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3005 if (was_enabled) ref_processor()->enable_discovery(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3006 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3007 { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3008 size_t expand_bytes = g1_policy()->expansion_amount(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3009 if (expand_bytes > 0) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3010 size_t bytes_before = capacity(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3011 expand(expand_bytes); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
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|
3012 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3013 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3014 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3015 if (mark_in_progress()) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
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changeset
|
3016 concurrent_mark()->update_g1_committed(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3017 } |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3018 |
|
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3019 #ifdef TRACESPINNING |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
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changeset
|
3020 ParallelTaskTerminator::print_termination_counts(); |
|
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3021 #endif |
| 342 | 3022 |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
3023 gc_epilogue(false); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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changeset
|
3024 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
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changeset
|
3025 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3026 assert(verify_region_lists(), "Bad region lists."); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
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|
3027 |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
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changeset
|
3028 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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|
3029 gclog_or_tty->print_cr("Stopping after GC #%d", ExitAfterGCNum); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
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changeset
|
3030 print_tracing_info(); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
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|
3031 vm_exit(-1); |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
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|
3032 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
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|
3033 } |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3034 |
| 1709 | 3035 TASKQUEUE_STATS_ONLY(if (ParallelGCVerbose) print_taskqueue_stats()); |
| 3036 TASKQUEUE_STATS_ONLY(reset_taskqueue_stats()); | |
| 3037 | |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
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|
3038 if (PrintHeapAtGC) { |
|
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
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changeset
|
3039 Universe::print_heap_after_gc(); |
| 342 | 3040 } |
|
884
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3041 if (G1SummarizeRSetStats && |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3042 (G1SummarizeRSetStatsPeriod > 0) && |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3043 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3044 g1_rem_set()->print_summary_info(); |
|
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
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883
diff
changeset
|
3045 } |
| 342 | 3046 } |
| 3047 | |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3048 size_t G1CollectedHeap::desired_plab_sz(GCAllocPurpose purpose) |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3049 { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3050 size_t gclab_word_size; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3051 switch (purpose) { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
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|
3052 case GCAllocForSurvived: |
|
79e419e5ea3b
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|
3053 gclab_word_size = YoungPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
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diff
changeset
|
3054 break; |
|
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6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
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changeset
|
3055 case GCAllocForTenured: |
|
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6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
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changeset
|
3056 gclab_word_size = OldPLABSize; |
|
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6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
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diff
changeset
|
3057 break; |
|
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6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
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diff
changeset
|
3058 default: |
|
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6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
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diff
changeset
|
3059 assert(false, "unknown GCAllocPurpose"); |
|
79e419e5ea3b
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apetrusenko
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diff
changeset
|
3060 gclab_word_size = OldPLABSize; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
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diff
changeset
|
3061 break; |
|
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6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
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changeset
|
3062 } |
|
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6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
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diff
changeset
|
3063 return gclab_word_size; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
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1390
diff
changeset
|
3064 } |
|
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6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
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diff
changeset
|
3065 |
|
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6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
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changeset
|
3066 |
| 342 | 3067 void G1CollectedHeap::set_gc_alloc_region(int purpose, HeapRegion* r) { |
| 3068 assert(purpose >= 0 && purpose < GCAllocPurposeCount, "invalid purpose"); | |
| 636 | 3069 // make sure we don't call set_gc_alloc_region() multiple times on |
| 3070 // the same region | |
| 3071 assert(r == NULL || !r->is_gc_alloc_region(), | |
| 3072 "shouldn't already be a GC alloc region"); | |
|
1360
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6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
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|
3073 assert(r == NULL || !r->isHumongous(), |
|
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6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
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|
3074 "humongous regions shouldn't be used as GC alloc regions"); |
|
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changeset
|
3075 |
| 342 | 3076 HeapWord* original_top = NULL; |
| 3077 if (r != NULL) | |
| 3078 original_top = r->top(); | |
| 3079 | |
| 3080 // We will want to record the used space in r as being there before gc. | |
| 3081 // One we install it as a GC alloc region it's eligible for allocation. | |
| 3082 // So record it now and use it later. | |
| 3083 size_t r_used = 0; | |
| 3084 if (r != NULL) { | |
| 3085 r_used = r->used(); | |
| 3086 | |
|
1833
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6984287: Regularize how GC parallel workers are specified.
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1755
diff
changeset
|
3087 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3088 // need to take the lock to guard against two threads calling |
| 3089 // get_gc_alloc_region concurrently (very unlikely but...) | |
| 3090 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 3091 r->save_marks(); | |
| 3092 } | |
| 3093 } | |
| 3094 HeapRegion* old_alloc_region = _gc_alloc_regions[purpose]; | |
| 3095 _gc_alloc_regions[purpose] = r; | |
| 3096 if (old_alloc_region != NULL) { | |
| 3097 // Replace aliases too. | |
| 3098 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 3099 if (_gc_alloc_regions[ap] == old_alloc_region) { | |
| 3100 _gc_alloc_regions[ap] = r; | |
| 3101 } | |
| 3102 } | |
| 3103 } | |
| 3104 if (r != NULL) { | |
| 3105 push_gc_alloc_region(r); | |
| 3106 if (mark_in_progress() && original_top != r->next_top_at_mark_start()) { | |
| 3107 // We are using a region as a GC alloc region after it has been used | |
| 3108 // as a mutator allocation region during the current marking cycle. | |
| 3109 // The mutator-allocated objects are currently implicitly marked, but | |
| 3110 // when we move hr->next_top_at_mark_start() forward at the the end | |
| 3111 // of the GC pause, they won't be. We therefore mark all objects in | |
| 3112 // the "gap". We do this object-by-object, since marking densely | |
| 3113 // does not currently work right with marking bitmap iteration. This | |
| 3114 // means we rely on TLAB filling at the start of pauses, and no | |
| 3115 // "resuscitation" of filled TLAB's. If we want to do this, we need | |
| 3116 // to fix the marking bitmap iteration. | |
| 3117 HeapWord* curhw = r->next_top_at_mark_start(); | |
| 3118 HeapWord* t = original_top; | |
| 3119 | |
| 3120 while (curhw < t) { | |
| 3121 oop cur = (oop)curhw; | |
| 3122 // We'll assume parallel for generality. This is rare code. | |
| 3123 concurrent_mark()->markAndGrayObjectIfNecessary(cur); // can't we just mark them? | |
| 3124 curhw = curhw + cur->size(); | |
| 3125 } | |
| 3126 assert(curhw == t, "Should have parsed correctly."); | |
| 3127 } | |
| 3128 if (G1PolicyVerbose > 1) { | |
| 3129 gclog_or_tty->print("New alloc region ["PTR_FORMAT", "PTR_FORMAT", " PTR_FORMAT") " | |
| 3130 "for survivors:", r->bottom(), original_top, r->end()); | |
| 3131 r->print(); | |
| 3132 } | |
| 3133 g1_policy()->record_before_bytes(r_used); | |
| 3134 } | |
| 3135 } | |
| 3136 | |
| 3137 void G1CollectedHeap::push_gc_alloc_region(HeapRegion* hr) { | |
| 3138 assert(Thread::current()->is_VM_thread() || | |
| 3139 par_alloc_during_gc_lock()->owned_by_self(), "Precondition"); | |
| 3140 assert(!hr->is_gc_alloc_region() && !hr->in_collection_set(), | |
| 3141 "Precondition."); | |
| 3142 hr->set_is_gc_alloc_region(true); | |
| 3143 hr->set_next_gc_alloc_region(_gc_alloc_region_list); | |
| 3144 _gc_alloc_region_list = hr; | |
| 3145 } | |
| 3146 | |
| 3147 #ifdef G1_DEBUG | |
| 3148 class FindGCAllocRegion: public HeapRegionClosure { | |
| 3149 public: | |
| 3150 bool doHeapRegion(HeapRegion* r) { | |
| 3151 if (r->is_gc_alloc_region()) { | |
| 3152 gclog_or_tty->print_cr("Region %d ["PTR_FORMAT"...] is still a gc_alloc_region.", | |
| 3153 r->hrs_index(), r->bottom()); | |
| 3154 } | |
| 3155 return false; | |
| 3156 } | |
| 3157 }; | |
| 3158 #endif // G1_DEBUG | |
| 3159 | |
| 3160 void G1CollectedHeap::forget_alloc_region_list() { | |
| 3161 assert(Thread::current()->is_VM_thread(), "Precondition"); | |
| 3162 while (_gc_alloc_region_list != NULL) { | |
| 3163 HeapRegion* r = _gc_alloc_region_list; | |
| 3164 assert(r->is_gc_alloc_region(), "Invariant."); | |
|
637
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6817419: G1: Enable extensive verification for humongous regions
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diff
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|
3165 // We need HeapRegion::oops_on_card_seq_iterate_careful() to work on |
|
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
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diff
changeset
|
3166 // newly allocated data in order to be able to apply deferred updates |
|
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
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636
diff
changeset
|
3167 // before the GC is done for verification purposes (i.e to allow |
|
25e146966e7c
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diff
changeset
|
3168 // G1HRRSFlushLogBuffersOnVerify). It's safe thing to do after the |
|
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
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636
diff
changeset
|
3169 // collection. |
|
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diff
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|
3170 r->ContiguousSpace::set_saved_mark(); |
| 342 | 3171 _gc_alloc_region_list = r->next_gc_alloc_region(); |
| 3172 r->set_next_gc_alloc_region(NULL); | |
| 3173 r->set_is_gc_alloc_region(false); | |
| 545 | 3174 if (r->is_survivor()) { |
| 3175 if (r->is_empty()) { | |
| 3176 r->set_not_young(); | |
| 3177 } else { | |
| 3178 _young_list->add_survivor_region(r); | |
| 3179 } | |
| 3180 } | |
| 342 | 3181 if (r->is_empty()) { |
| 3182 ++_free_regions; | |
| 3183 } | |
| 3184 } | |
| 3185 #ifdef G1_DEBUG | |
| 3186 FindGCAllocRegion fa; | |
| 3187 heap_region_iterate(&fa); | |
| 3188 #endif // G1_DEBUG | |
| 3189 } | |
| 3190 | |
| 3191 | |
| 3192 bool G1CollectedHeap::check_gc_alloc_regions() { | |
| 3193 // TODO: allocation regions check | |
| 3194 return true; | |
| 3195 } | |
| 3196 | |
| 3197 void G1CollectedHeap::get_gc_alloc_regions() { | |
| 636 | 3198 // First, let's check that the GC alloc region list is empty (it should) |
| 3199 assert(_gc_alloc_region_list == NULL, "invariant"); | |
| 3200 | |
| 342 | 3201 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
| 636 | 3202 assert(_gc_alloc_regions[ap] == NULL, "invariant"); |
|
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846
diff
changeset
|
3203 assert(_gc_alloc_region_counts[ap] == 0, "invariant"); |
| 636 | 3204 |
| 342 | 3205 // Create new GC alloc regions. |
| 636 | 3206 HeapRegion* alloc_region = _retained_gc_alloc_regions[ap]; |
| 3207 _retained_gc_alloc_regions[ap] = NULL; | |
| 3208 | |
| 3209 if (alloc_region != NULL) { | |
| 3210 assert(_retain_gc_alloc_region[ap], "only way to retain a GC region"); | |
| 3211 | |
| 3212 // let's make sure that the GC alloc region is not tagged as such | |
| 3213 // outside a GC operation | |
| 3214 assert(!alloc_region->is_gc_alloc_region(), "sanity"); | |
| 3215 | |
| 3216 if (alloc_region->in_collection_set() || | |
| 3217 alloc_region->top() == alloc_region->end() || | |
|
1360
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1359
diff
changeset
|
3218 alloc_region->top() == alloc_region->bottom() || |
|
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
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1359
diff
changeset
|
3219 alloc_region->isHumongous()) { |
|
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
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parents:
1359
diff
changeset
|
3220 // we will discard the current GC alloc region if |
|
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
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parents:
1359
diff
changeset
|
3221 // * 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
|
3222 // * 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
|
3223 // * 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
|
3224 // 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
|
3225 // * 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
|
3226 // 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
|
3227 // has been subseqently used to allocate a humongous |
|
bda703475ded
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1359
diff
changeset
|
3228 // object that may be less than the region size). |
| 636 | 3229 |
| 3230 alloc_region = NULL; | |
| 3231 } | |
| 3232 } | |
| 3233 | |
| 3234 if (alloc_region == NULL) { | |
| 3235 // we will get a new GC alloc region | |
| 342 | 3236 alloc_region = newAllocRegionWithExpansion(ap, 0); |
|
861
45d97a99715b
6862661: G1: _gc_alloc_region_counts is not updated properly after 6604422
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diff
changeset
|
3237 } else { |
|
45d97a99715b
6862661: G1: _gc_alloc_region_counts is not updated properly after 6604422
apetrusenko
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846
diff
changeset
|
3238 // the region was retained from the last collection |
|
45d97a99715b
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apetrusenko
parents:
846
diff
changeset
|
3239 ++_gc_alloc_region_counts[ap]; |
| 1388 | 3240 if (G1PrintHeapRegions) { |
| 3241 gclog_or_tty->print_cr("new alloc region %d:["PTR_FORMAT", "PTR_FORMAT"], " | |
| 3242 "top "PTR_FORMAT, | |
| 3243 alloc_region->hrs_index(), alloc_region->bottom(), alloc_region->end(), alloc_region->top()); | |
| 3244 } | |
| 342 | 3245 } |
| 636 | 3246 |
| 342 | 3247 if (alloc_region != NULL) { |
| 636 | 3248 assert(_gc_alloc_regions[ap] == NULL, "pre-condition"); |
| 342 | 3249 set_gc_alloc_region(ap, alloc_region); |
| 3250 } | |
| 636 | 3251 |
| 3252 assert(_gc_alloc_regions[ap] == NULL || | |
| 3253 _gc_alloc_regions[ap]->is_gc_alloc_region(), | |
| 3254 "the GC alloc region should be tagged as such"); | |
| 3255 assert(_gc_alloc_regions[ap] == NULL || | |
| 3256 _gc_alloc_regions[ap] == _gc_alloc_region_list, | |
| 3257 "the GC alloc region should be the same as the GC alloc list head"); | |
| 342 | 3258 } |
| 3259 // Set alternative regions for allocation purposes that have reached | |
| 636 | 3260 // their limit. |
| 342 | 3261 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
| 3262 GCAllocPurpose alt_purpose = g1_policy()->alternative_purpose(ap); | |
| 3263 if (_gc_alloc_regions[ap] == NULL && alt_purpose != ap) { | |
| 3264 _gc_alloc_regions[ap] = _gc_alloc_regions[alt_purpose]; | |
| 3265 } | |
| 3266 } | |
| 3267 assert(check_gc_alloc_regions(), "alloc regions messed up"); | |
| 3268 } | |
| 3269 | |
| 636 | 3270 void G1CollectedHeap::release_gc_alloc_regions(bool totally) { |
| 342 | 3271 // We keep a separate list of all regions that have been alloc regions in |
| 636 | 3272 // the current collection pause. Forget that now. This method will |
| 3273 // untag the GC alloc regions and tear down the GC alloc region | |
| 3274 // list. It's desirable that no regions are tagged as GC alloc | |
| 3275 // outside GCs. | |
| 342 | 3276 forget_alloc_region_list(); |
| 3277 | |
| 3278 // The current alloc regions contain objs that have survived | |
| 3279 // collection. Make them no longer GC alloc regions. | |
| 3280 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 3281 HeapRegion* r = _gc_alloc_regions[ap]; | |
| 636 | 3282 _retained_gc_alloc_regions[ap] = NULL; |
|
861
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846
diff
changeset
|
3283 _gc_alloc_region_counts[ap] = 0; |
| 636 | 3284 |
| 3285 if (r != NULL) { | |
| 3286 // we retain nothing on _gc_alloc_regions between GCs | |
| 3287 set_gc_alloc_region(ap, NULL); | |
| 3288 | |
| 3289 if (r->is_empty()) { | |
| 3290 // we didn't actually allocate anything in it; let's just put | |
| 3291 // it on the free list | |
| 342 | 3292 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); |
| 3293 r->set_zero_fill_complete(); | |
| 3294 put_free_region_on_list_locked(r); | |
| 636 | 3295 } else if (_retain_gc_alloc_region[ap] && !totally) { |
| 3296 // retain it so that we can use it at the beginning of the next GC | |
| 3297 _retained_gc_alloc_regions[ap] = r; | |
| 342 | 3298 } |
| 3299 } | |
| 636 | 3300 } |
| 3301 } | |
| 3302 | |
| 3303 #ifndef PRODUCT | |
| 3304 // Useful for debugging | |
| 3305 | |
| 3306 void G1CollectedHeap::print_gc_alloc_regions() { | |
| 3307 gclog_or_tty->print_cr("GC alloc regions"); | |
| 3308 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
| 3309 HeapRegion* r = _gc_alloc_regions[ap]; | |
| 3310 if (r == NULL) { | |
| 3311 gclog_or_tty->print_cr(" %2d : "PTR_FORMAT, ap, NULL); | |
| 3312 } else { | |
| 3313 gclog_or_tty->print_cr(" %2d : "PTR_FORMAT" "SIZE_FORMAT, | |
| 3314 ap, r->bottom(), r->used()); | |
| 3315 } | |
| 3316 } | |
| 3317 } | |
| 3318 #endif // PRODUCT | |
| 342 | 3319 |
| 3320 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
| 3321 _drain_in_progress = false; | |
| 3322 set_evac_failure_closure(cl); | |
| 3323 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 3324 } | |
| 3325 | |
| 3326 void G1CollectedHeap::finalize_for_evac_failure() { | |
| 3327 assert(_evac_failure_scan_stack != NULL && | |
| 3328 _evac_failure_scan_stack->length() == 0, | |
| 3329 "Postcondition"); | |
| 3330 assert(!_drain_in_progress, "Postcondition"); | |
| 1045 | 3331 delete _evac_failure_scan_stack; |
| 342 | 3332 _evac_failure_scan_stack = NULL; |
| 3333 } | |
| 3334 | |
| 3335 | |
| 3336 | |
| 3337 // *** Sequential G1 Evacuation | |
| 3338 | |
| 3339 HeapWord* G1CollectedHeap::allocate_during_gc(GCAllocPurpose purpose, size_t word_size) { | |
| 3340 HeapRegion* alloc_region = _gc_alloc_regions[purpose]; | |
| 3341 // let the caller handle alloc failure | |
| 3342 if (alloc_region == NULL) return NULL; | |
| 3343 assert(isHumongous(word_size) || !alloc_region->isHumongous(), | |
| 3344 "Either the object is humongous or the region isn't"); | |
| 3345 HeapWord* block = alloc_region->allocate(word_size); | |
| 3346 if (block == NULL) { | |
| 3347 block = allocate_during_gc_slow(purpose, alloc_region, false, word_size); | |
| 3348 } | |
| 3349 return block; | |
| 3350 } | |
| 3351 | |
| 3352 class G1IsAliveClosure: public BoolObjectClosure { | |
| 3353 G1CollectedHeap* _g1; | |
| 3354 public: | |
| 3355 G1IsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
| 3356 void do_object(oop p) { assert(false, "Do not call."); } | |
| 3357 bool do_object_b(oop p) { | |
| 3358 // It is reachable if it is outside the collection set, or is inside | |
| 3359 // and forwarded. | |
| 3360 | |
| 3361 #ifdef G1_DEBUG | |
| 3362 gclog_or_tty->print_cr("is alive "PTR_FORMAT" in CS %d forwarded %d overall %d", | |
| 3363 (void*) p, _g1->obj_in_cs(p), p->is_forwarded(), | |
| 3364 !_g1->obj_in_cs(p) || p->is_forwarded()); | |
| 3365 #endif // G1_DEBUG | |
| 3366 | |
| 3367 return !_g1->obj_in_cs(p) || p->is_forwarded(); | |
| 3368 } | |
| 3369 }; | |
| 3370 | |
| 3371 class G1KeepAliveClosure: public OopClosure { | |
| 3372 G1CollectedHeap* _g1; | |
| 3373 public: | |
| 3374 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
|
845
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6700789: G1: Enable use of compressed oops with G1 heaps
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838
diff
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|
3375 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
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838
diff
changeset
|
3376 void do_oop( oop* p) { |
| 342 | 3377 oop obj = *p; |
| 3378 #ifdef G1_DEBUG | |
| 3379 if (PrintGC && Verbose) { | |
| 3380 gclog_or_tty->print_cr("keep alive *"PTR_FORMAT" = "PTR_FORMAT" "PTR_FORMAT, | |
| 3381 p, (void*) obj, (void*) *p); | |
| 3382 } | |
| 3383 #endif // G1_DEBUG | |
| 3384 | |
| 3385 if (_g1->obj_in_cs(obj)) { | |
| 3386 assert( obj->is_forwarded(), "invariant" ); | |
| 3387 *p = obj->forwardee(); | |
| 3388 #ifdef G1_DEBUG | |
| 3389 gclog_or_tty->print_cr(" in CSet: moved "PTR_FORMAT" -> "PTR_FORMAT, | |
| 3390 (void*) obj, (void*) *p); | |
| 3391 #endif // G1_DEBUG | |
| 3392 } | |
| 3393 } | |
| 3394 }; | |
| 3395 | |
|
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3396 class UpdateRSetDeferred : public OopsInHeapRegionClosure { |
|
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3397 private: |
|
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3398 G1CollectedHeap* _g1; |
|
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3399 DirtyCardQueue *_dcq; |
|
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3400 CardTableModRefBS* _ct_bs; |
|
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3401 |
|
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3402 public: |
|
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3403 UpdateRSetDeferred(G1CollectedHeap* g1, DirtyCardQueue* dcq) : |
|
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3404 _g1(g1), _ct_bs((CardTableModRefBS*)_g1->barrier_set()), _dcq(dcq) {} |
|
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3405 |
|
845
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3406 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
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3407 virtual void do_oop( oop* p) { do_oop_work(p); } |
|
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3408 template <class T> void do_oop_work(T* p) { |
|
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3409 assert(_from->is_in_reserved(p), "paranoia"); |
|
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3410 if (!_from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && |
|
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3411 !_from->is_survivor()) { |
|
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3412 size_t card_index = _ct_bs->index_for(p); |
|
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3413 if (_ct_bs->mark_card_deferred(card_index)) { |
|
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3414 _dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index)); |
|
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3415 } |
|
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3416 } |
|
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3417 } |
|
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|
3418 }; |
|
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3419 |
| 342 | 3420 class RemoveSelfPointerClosure: public ObjectClosure { |
| 3421 private: | |
| 3422 G1CollectedHeap* _g1; | |
| 3423 ConcurrentMark* _cm; | |
| 3424 HeapRegion* _hr; | |
| 3425 size_t _prev_marked_bytes; | |
| 3426 size_t _next_marked_bytes; | |
|
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3427 OopsInHeapRegionClosure *_cl; |
| 342 | 3428 public: |
|
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3429 RemoveSelfPointerClosure(G1CollectedHeap* g1, OopsInHeapRegionClosure* cl) : |
|
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3430 _g1(g1), _cm(_g1->concurrent_mark()), _prev_marked_bytes(0), |
|
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3431 _next_marked_bytes(0), _cl(cl) {} |
| 342 | 3432 |
| 3433 size_t prev_marked_bytes() { return _prev_marked_bytes; } | |
| 3434 size_t next_marked_bytes() { return _next_marked_bytes; } | |
| 3435 | |
|
352
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3436 // The original idea here was to coalesce evacuated and dead objects. |
|
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3437 // However that caused complications with the block offset table (BOT). |
|
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3438 // In particular if there were two TLABs, one of them partially refined. |
|
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3439 // |----- TLAB_1--------|----TLAB_2-~~~(partially refined part)~~~| |
|
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3440 // The BOT entries of the unrefined part of TLAB_2 point to the start |
|
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3441 // of TLAB_2. If the last object of the TLAB_1 and the first object |
|
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3442 // of TLAB_2 are coalesced, then the cards of the unrefined part |
|
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3443 // would point into middle of the filler object. |
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3444 // |
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3445 // The current approach is to not coalesce and leave the BOT contents intact. |
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3446 void do_object(oop obj) { |
|
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3447 if (obj->is_forwarded() && obj->forwardee() == obj) { |
|
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3448 // The object failed to move. |
|
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3449 assert(!_g1->is_obj_dead(obj), "We should not be preserving dead objs."); |
|
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3450 _cm->markPrev(obj); |
|
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3451 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
|
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3452 _prev_marked_bytes += (obj->size() * HeapWordSize); |
|
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3453 if (_g1->mark_in_progress() && !_g1->is_obj_ill(obj)) { |
|
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3454 _cm->markAndGrayObjectIfNecessary(obj); |
|
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3455 } |
|
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3456 obj->set_mark(markOopDesc::prototype()); |
|
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3457 // While we were processing RSet buffers during the |
|
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3458 // collection, we actually didn't scan any cards on the |
|
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3459 // collection set, since we didn't want to update remebered |
|
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3460 // sets with entries that point into the collection set, given |
|
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3461 // that live objects fromthe collection set are about to move |
|
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3462 // and such entries will be stale very soon. This change also |
|
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3463 // dealt with a reliability issue which involved scanning a |
|
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3464 // card in the collection set and coming across an array that |
|
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3465 // was being chunked and looking malformed. The problem is |
|
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3466 // that, if evacuation fails, we might have remembered set |
|
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3467 // entries missing given that we skipped cards on the |
|
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3468 // collection set. So, we'll recreate such entries now. |
|
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3469 obj->oop_iterate(_cl); |
|
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3470 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
|
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3471 } else { |
|
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3472 // The object has been either evacuated or is dead. Fill it with a |
|
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3473 // dummy object. |
|
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3474 MemRegion mr((HeapWord*)obj, obj->size()); |
|
481
7d7a7c599c17
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|
3475 CollectedHeap::fill_with_object(mr); |
| 342 | 3476 _cm->clearRangeBothMaps(mr); |
| 3477 } | |
| 3478 } | |
| 3479 }; | |
| 3480 | |
| 3481 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
| 1705 | 3482 UpdateRSetImmediate immediate_update(_g1h->g1_rem_set()); |
|
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3483 DirtyCardQueue dcq(&_g1h->dirty_card_queue_set()); |
|
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3484 UpdateRSetDeferred deferred_update(_g1h, &dcq); |
|
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3485 OopsInHeapRegionClosure *cl; |
|
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3486 if (G1DeferredRSUpdate) { |
|
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3487 cl = &deferred_update; |
|
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|
3488 } else { |
|
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|
3489 cl = &immediate_update; |
|
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|
3490 } |
| 342 | 3491 HeapRegion* cur = g1_policy()->collection_set(); |
| 3492 while (cur != NULL) { | |
| 3493 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
| 3494 | |
|
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|
3495 RemoveSelfPointerClosure rspc(_g1h, cl); |
| 342 | 3496 if (cur->evacuation_failed()) { |
| 3497 assert(cur->in_collection_set(), "bad CS"); | |
|
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|
3498 cl->set_region(cur); |
| 342 | 3499 cur->object_iterate(&rspc); |
| 3500 | |
| 3501 // A number of manipulations to make the TAMS be the current top, | |
| 3502 // and the marked bytes be the ones observed in the iteration. | |
| 3503 if (_g1h->concurrent_mark()->at_least_one_mark_complete()) { | |
| 3504 // The comments below are the postconditions achieved by the | |
| 3505 // calls. Note especially the last such condition, which says that | |
| 3506 // the count of marked bytes has been properly restored. | |
| 3507 cur->note_start_of_marking(false); | |
| 3508 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
| 3509 cur->add_to_marked_bytes(rspc.prev_marked_bytes()); | |
| 3510 // _next_marked_bytes == prev_marked_bytes. | |
| 3511 cur->note_end_of_marking(); | |
| 3512 // _prev_top_at_mark_start == top(), | |
| 3513 // _prev_marked_bytes == prev_marked_bytes | |
| 3514 } | |
| 3515 // If there is no mark in progress, we modified the _next variables | |
| 3516 // above needlessly, but harmlessly. | |
| 3517 if (_g1h->mark_in_progress()) { | |
| 3518 cur->note_start_of_marking(false); | |
| 3519 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
| 3520 // _next_marked_bytes == next_marked_bytes. | |
| 3521 } | |
| 3522 | |
| 3523 // Now make sure the region has the right index in the sorted array. | |
| 3524 g1_policy()->note_change_in_marked_bytes(cur); | |
| 3525 } | |
| 3526 cur = cur->next_in_collection_set(); | |
| 3527 } | |
| 3528 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
| 3529 | |
| 3530 // Now restore saved marks, if any. | |
| 3531 if (_objs_with_preserved_marks != NULL) { | |
| 3532 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
| 3533 assert(_objs_with_preserved_marks->length() == | |
| 3534 _preserved_marks_of_objs->length(), "Both or none."); | |
| 3535 guarantee(_objs_with_preserved_marks->length() == | |
| 3536 _preserved_marks_of_objs->length(), "Both or none."); | |
| 3537 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
| 3538 oop obj = _objs_with_preserved_marks->at(i); | |
| 3539 markOop m = _preserved_marks_of_objs->at(i); | |
| 3540 obj->set_mark(m); | |
| 3541 } | |
| 3542 // Delete the preserved marks growable arrays (allocated on the C heap). | |
| 3543 delete _objs_with_preserved_marks; | |
| 3544 delete _preserved_marks_of_objs; | |
| 3545 _objs_with_preserved_marks = NULL; | |
| 3546 _preserved_marks_of_objs = NULL; | |
| 3547 } | |
| 3548 } | |
| 3549 | |
| 3550 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
| 3551 _evac_failure_scan_stack->push(obj); | |
| 3552 } | |
| 3553 | |
| 3554 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
| 3555 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
| 3556 | |
| 3557 while (_evac_failure_scan_stack->length() > 0) { | |
| 3558 oop obj = _evac_failure_scan_stack->pop(); | |
| 3559 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
| 3560 obj->oop_iterate_backwards(_evac_failure_closure); | |
| 3561 } | |
| 3562 } | |
| 3563 | |
| 3564 void G1CollectedHeap::handle_evacuation_failure(oop old) { | |
| 3565 markOop m = old->mark(); | |
| 3566 // forward to self | |
| 3567 assert(!old->is_forwarded(), "precondition"); | |
| 3568 | |
| 3569 old->forward_to(old); | |
| 3570 handle_evacuation_failure_common(old, m); | |
| 3571 } | |
| 3572 | |
| 3573 oop | |
| 3574 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
| 3575 oop old) { | |
| 3576 markOop m = old->mark(); | |
| 3577 oop forward_ptr = old->forward_to_atomic(old); | |
| 3578 if (forward_ptr == NULL) { | |
| 3579 // Forward-to-self succeeded. | |
| 3580 if (_evac_failure_closure != cl) { | |
| 3581 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
| 3582 assert(!_drain_in_progress, | |
| 3583 "Should only be true while someone holds the lock."); | |
| 3584 // Set the global evac-failure closure to the current thread's. | |
| 3585 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
| 3586 set_evac_failure_closure(cl); | |
| 3587 // Now do the common part. | |
| 3588 handle_evacuation_failure_common(old, m); | |
| 3589 // Reset to NULL. | |
| 3590 set_evac_failure_closure(NULL); | |
| 3591 } else { | |
| 3592 // The lock is already held, and this is recursive. | |
| 3593 assert(_drain_in_progress, "This should only be the recursive case."); | |
| 3594 handle_evacuation_failure_common(old, m); | |
| 3595 } | |
| 3596 return old; | |
| 3597 } else { | |
| 3598 // Someone else had a place to copy it. | |
| 3599 return forward_ptr; | |
| 3600 } | |
| 3601 } | |
| 3602 | |
| 3603 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
| 3604 set_evacuation_failed(true); | |
| 3605 | |
| 3606 preserve_mark_if_necessary(old, m); | |
| 3607 | |
| 3608 HeapRegion* r = heap_region_containing(old); | |
| 3609 if (!r->evacuation_failed()) { | |
| 3610 r->set_evacuation_failed(true); | |
| 1282 | 3611 if (G1PrintHeapRegions) { |
|
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3612 gclog_or_tty->print("overflow in heap region "PTR_FORMAT" " |
| 342 | 3613 "["PTR_FORMAT","PTR_FORMAT")\n", |
| 3614 r, r->bottom(), r->end()); | |
| 3615 } | |
| 3616 } | |
| 3617 | |
| 3618 push_on_evac_failure_scan_stack(old); | |
| 3619 | |
| 3620 if (!_drain_in_progress) { | |
| 3621 // prevent recursion in copy_to_survivor_space() | |
| 3622 _drain_in_progress = true; | |
| 3623 drain_evac_failure_scan_stack(); | |
| 3624 _drain_in_progress = false; | |
| 3625 } | |
| 3626 } | |
| 3627 | |
| 3628 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
| 3629 if (m != markOopDesc::prototype()) { | |
| 3630 if (_objs_with_preserved_marks == NULL) { | |
| 3631 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
| 3632 _objs_with_preserved_marks = | |
| 3633 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
| 3634 _preserved_marks_of_objs = | |
| 3635 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
| 3636 } | |
| 3637 _objs_with_preserved_marks->push(obj); | |
| 3638 _preserved_marks_of_objs->push(m); | |
| 3639 } | |
| 3640 } | |
| 3641 | |
| 3642 // *** Parallel G1 Evacuation | |
| 3643 | |
| 3644 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
| 3645 size_t word_size) { | |
|
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3646 assert(!isHumongous(word_size), |
|
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3647 err_msg("we should not be seeing humongous allocation requests " |
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3648 "during GC, word_size = "SIZE_FORMAT, word_size)); |
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3649 |
| 342 | 3650 HeapRegion* alloc_region = _gc_alloc_regions[purpose]; |
| 3651 // let the caller handle alloc failure | |
| 3652 if (alloc_region == NULL) return NULL; | |
| 3653 | |
| 3654 HeapWord* block = alloc_region->par_allocate(word_size); | |
| 3655 if (block == NULL) { | |
| 3656 MutexLockerEx x(par_alloc_during_gc_lock(), | |
| 3657 Mutex::_no_safepoint_check_flag); | |
| 3658 block = allocate_during_gc_slow(purpose, alloc_region, true, word_size); | |
| 3659 } | |
| 3660 return block; | |
| 3661 } | |
| 3662 | |
| 545 | 3663 void G1CollectedHeap::retire_alloc_region(HeapRegion* alloc_region, |
| 3664 bool par) { | |
| 3665 // Another thread might have obtained alloc_region for the given | |
| 3666 // purpose, and might be attempting to allocate in it, and might | |
| 3667 // succeed. Therefore, we can't do the "finalization" stuff on the | |
| 3668 // region below until we're sure the last allocation has happened. | |
| 3669 // We ensure this by allocating the remaining space with a garbage | |
| 3670 // object. | |
| 3671 if (par) par_allocate_remaining_space(alloc_region); | |
| 3672 // Now we can do the post-GC stuff on the region. | |
| 3673 alloc_region->note_end_of_copying(); | |
| 3674 g1_policy()->record_after_bytes(alloc_region->used()); | |
| 3675 } | |
| 3676 | |
| 342 | 3677 HeapWord* |
| 3678 G1CollectedHeap::allocate_during_gc_slow(GCAllocPurpose purpose, | |
| 3679 HeapRegion* alloc_region, | |
| 3680 bool par, | |
| 3681 size_t word_size) { | |
|
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3682 assert(!isHumongous(word_size), |
|
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3683 err_msg("we should not be seeing humongous allocation requests " |
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3684 "during GC, word_size = "SIZE_FORMAT, word_size)); |
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3685 |
| 342 | 3686 HeapWord* block = NULL; |
| 3687 // In the parallel case, a previous thread to obtain the lock may have | |
| 3688 // already assigned a new gc_alloc_region. | |
| 3689 if (alloc_region != _gc_alloc_regions[purpose]) { | |
| 3690 assert(par, "But should only happen in parallel case."); | |
| 3691 alloc_region = _gc_alloc_regions[purpose]; | |
| 3692 if (alloc_region == NULL) return NULL; | |
| 3693 block = alloc_region->par_allocate(word_size); | |
| 3694 if (block != NULL) return block; | |
| 3695 // Otherwise, continue; this new region is empty, too. | |
| 3696 } | |
| 3697 assert(alloc_region != NULL, "We better have an allocation region"); | |
| 545 | 3698 retire_alloc_region(alloc_region, par); |
| 342 | 3699 |
| 3700 if (_gc_alloc_region_counts[purpose] >= g1_policy()->max_regions(purpose)) { | |
| 3701 // Cannot allocate more regions for the given purpose. | |
| 3702 GCAllocPurpose alt_purpose = g1_policy()->alternative_purpose(purpose); | |
| 3703 // Is there an alternative? | |
| 3704 if (purpose != alt_purpose) { | |
| 3705 HeapRegion* alt_region = _gc_alloc_regions[alt_purpose]; | |
| 3706 // Has not the alternative region been aliased? | |
| 545 | 3707 if (alloc_region != alt_region && alt_region != NULL) { |
| 342 | 3708 // Try to allocate in the alternative region. |
| 3709 if (par) { | |
| 3710 block = alt_region->par_allocate(word_size); | |
| 3711 } else { | |
| 3712 block = alt_region->allocate(word_size); | |
| 3713 } | |
| 3714 // Make an alias. | |
| 3715 _gc_alloc_regions[purpose] = _gc_alloc_regions[alt_purpose]; | |
| 545 | 3716 if (block != NULL) { |
| 3717 return block; | |
| 3718 } | |
| 3719 retire_alloc_region(alt_region, par); | |
| 342 | 3720 } |
| 3721 // Both the allocation region and the alternative one are full | |
| 3722 // and aliased, replace them with a new allocation region. | |
| 3723 purpose = alt_purpose; | |
| 3724 } else { | |
| 3725 set_gc_alloc_region(purpose, NULL); | |
| 3726 return NULL; | |
| 3727 } | |
| 3728 } | |
| 3729 | |
| 3730 // Now allocate a new region for allocation. | |
| 3731 alloc_region = newAllocRegionWithExpansion(purpose, word_size, false /*zero_filled*/); | |
| 3732 | |
| 3733 // let the caller handle alloc failure | |
| 3734 if (alloc_region != NULL) { | |
| 3735 | |
| 3736 assert(check_gc_alloc_regions(), "alloc regions messed up"); | |
| 3737 assert(alloc_region->saved_mark_at_top(), | |
| 3738 "Mark should have been saved already."); | |
| 3739 // We used to assert that the region was zero-filled here, but no | |
| 3740 // longer. | |
| 3741 | |
| 3742 // This must be done last: once it's installed, other regions may | |
| 3743 // allocate in it (without holding the lock.) | |
| 3744 set_gc_alloc_region(purpose, alloc_region); | |
| 3745 | |
| 3746 if (par) { | |
| 3747 block = alloc_region->par_allocate(word_size); | |
| 3748 } else { | |
| 3749 block = alloc_region->allocate(word_size); | |
| 3750 } | |
| 3751 // Caller handles alloc failure. | |
| 3752 } else { | |
| 3753 // This sets other apis using the same old alloc region to NULL, also. | |
| 3754 set_gc_alloc_region(purpose, NULL); | |
| 3755 } | |
| 3756 return block; // May be NULL. | |
| 3757 } | |
| 3758 | |
| 3759 void G1CollectedHeap::par_allocate_remaining_space(HeapRegion* r) { | |
| 3760 HeapWord* block = NULL; | |
| 3761 size_t free_words; | |
| 3762 do { | |
| 3763 free_words = r->free()/HeapWordSize; | |
| 3764 // If there's too little space, no one can allocate, so we're done. | |
|
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3765 if (free_words < CollectedHeap::min_fill_size()) return; |
| 342 | 3766 // Otherwise, try to claim it. |
| 3767 block = r->par_allocate(free_words); | |
| 3768 } while (block == NULL); | |
|
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3769 fill_with_object(block, free_words); |
| 342 | 3770 } |
| 3771 | |
| 3772 #ifndef PRODUCT | |
| 3773 bool GCLabBitMapClosure::do_bit(size_t offset) { | |
| 3774 HeapWord* addr = _bitmap->offsetToHeapWord(offset); | |
| 3775 guarantee(_cm->isMarked(oop(addr)), "it should be!"); | |
| 3776 return true; | |
| 3777 } | |
| 3778 #endif // PRODUCT | |
| 3779 | |
|
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3780 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num) |
|
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3781 : _g1h(g1h), |
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3782 _refs(g1h->task_queue(queue_num)), |
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3783 _dcq(&g1h->dirty_card_queue_set()), |
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3784 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
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3785 _g1_rem(g1h->g1_rem_set()), |
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|
3786 _hash_seed(17), _queue_num(queue_num), |
|
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3787 _term_attempts(0), |
|
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3788 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)), |
|
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3789 _tenured_alloc_buffer(g1h->desired_plab_sz(GCAllocForTenured)), |
|
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3790 _age_table(false), |
|
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3791 _strong_roots_time(0), _term_time(0), |
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3792 _alloc_buffer_waste(0), _undo_waste(0) |
|
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3793 { |
|
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3794 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
|
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3795 // we "sacrifice" entry 0 to keep track of surviving bytes for |
|
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3796 // non-young regions (where the age is -1) |
|
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3797 // We also add a few elements at the beginning and at the end in |
|
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3798 // an attempt to eliminate cache contention |
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|
3799 size_t real_length = 1 + _g1h->g1_policy()->young_cset_length(); |
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3800 size_t array_length = PADDING_ELEM_NUM + |
|
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3801 real_length + |
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3802 PADDING_ELEM_NUM; |
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3803 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length); |
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3804 if (_surviving_young_words_base == NULL) |
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3805 vm_exit_out_of_memory(array_length * sizeof(size_t), |
|
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3806 "Not enough space for young surv histo."); |
|
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3807 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; |
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3808 memset(_surviving_young_words, 0, real_length * sizeof(size_t)); |
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3809 |
|
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3810 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer; |
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3811 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer; |
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3812 |
|
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3813 _start = os::elapsedTime(); |
|
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3814 } |
| 342 | 3815 |
| 1709 | 3816 void |
| 3817 G1ParScanThreadState::print_termination_stats_hdr(outputStream* const st) | |
| 3818 { | |
| 3819 st->print_raw_cr("GC Termination Stats"); | |
| 3820 st->print_raw_cr(" elapsed --strong roots-- -------termination-------" | |
| 3821 " ------waste (KiB)------"); | |
| 3822 st->print_raw_cr("thr ms ms % ms % attempts" | |
| 3823 " total alloc undo"); | |
| 3824 st->print_raw_cr("--- --------- --------- ------ --------- ------ --------" | |
| 3825 " ------- ------- -------"); | |
| 3826 } | |
| 3827 | |
| 3828 void | |
| 3829 G1ParScanThreadState::print_termination_stats(int i, | |
| 3830 outputStream* const st) const | |
| 3831 { | |
| 3832 const double elapsed_ms = elapsed_time() * 1000.0; | |
| 3833 const double s_roots_ms = strong_roots_time() * 1000.0; | |
| 3834 const double term_ms = term_time() * 1000.0; | |
| 3835 st->print_cr("%3d %9.2f %9.2f %6.2f " | |
| 3836 "%9.2f %6.2f " SIZE_FORMAT_W(8) " " | |
| 3837 SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7), | |
| 3838 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
| 3839 term_ms, term_ms * 100 / elapsed_ms, term_attempts(), | |
| 3840 (alloc_buffer_waste() + undo_waste()) * HeapWordSize / K, | |
| 3841 alloc_buffer_waste() * HeapWordSize / K, | |
| 3842 undo_waste() * HeapWordSize / K); | |
| 3843 } | |
| 3844 | |
| 342 | 3845 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : |
| 3846 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), | |
| 3847 _par_scan_state(par_scan_state) { } | |
| 3848 | |
|
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3849 template <class T> void G1ParCopyHelper::mark_forwardee(T* p) { |
| 342 | 3850 // This is called _after_ do_oop_work has been called, hence after |
| 3851 // the object has been relocated to its new location and *p points | |
| 3852 // to its new location. | |
| 3853 | |
|
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3854 T heap_oop = oopDesc::load_heap_oop(p); |
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3855 if (!oopDesc::is_null(heap_oop)) { |
|
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|
3856 oop obj = oopDesc::decode_heap_oop(heap_oop); |
|
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|
3857 assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj)), |
| 342 | 3858 "shouldn't still be in the CSet if evacuation didn't fail."); |
|
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3859 HeapWord* addr = (HeapWord*)obj; |
| 342 | 3860 if (_g1->is_in_g1_reserved(addr)) |
| 3861 _cm->grayRoot(oop(addr)); | |
| 3862 } | |
| 3863 } | |
| 3864 | |
| 3865 oop G1ParCopyHelper::copy_to_survivor_space(oop old) { | |
| 3866 size_t word_sz = old->size(); | |
| 3867 HeapRegion* from_region = _g1->heap_region_containing_raw(old); | |
| 3868 // +1 to make the -1 indexes valid... | |
| 3869 int young_index = from_region->young_index_in_cset()+1; | |
| 3870 assert( (from_region->is_young() && young_index > 0) || | |
| 3871 (!from_region->is_young() && young_index == 0), "invariant" ); | |
| 3872 G1CollectorPolicy* g1p = _g1->g1_policy(); | |
| 3873 markOop m = old->mark(); | |
| 545 | 3874 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
| 3875 : m->age(); | |
| 3876 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
| 342 | 3877 word_sz); |
| 3878 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
| 3879 oop obj = oop(obj_ptr); | |
| 3880 | |
| 3881 if (obj_ptr == NULL) { | |
| 3882 // This will either forward-to-self, or detect that someone else has | |
| 3883 // installed a forwarding pointer. | |
| 3884 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
| 3885 return _g1->handle_evacuation_failure_par(cl, old); | |
| 3886 } | |
| 3887 | |
| 526 | 3888 // We're going to allocate linearly, so might as well prefetch ahead. |
| 3889 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
| 3890 | |
| 342 | 3891 oop forward_ptr = old->forward_to_atomic(obj); |
| 3892 if (forward_ptr == NULL) { | |
| 3893 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
| 526 | 3894 if (g1p->track_object_age(alloc_purpose)) { |
| 3895 // We could simply do obj->incr_age(). However, this causes a | |
| 3896 // performance issue. obj->incr_age() will first check whether | |
| 3897 // the object has a displaced mark by checking its mark word; | |
| 3898 // getting the mark word from the new location of the object | |
| 3899 // stalls. So, given that we already have the mark word and we | |
| 3900 // are about to install it anyway, it's better to increase the | |
| 3901 // age on the mark word, when the object does not have a | |
| 3902 // displaced mark word. We're not expecting many objects to have | |
| 3903 // a displaced marked word, so that case is not optimized | |
| 3904 // further (it could be...) and we simply call obj->incr_age(). | |
| 3905 | |
| 3906 if (m->has_displaced_mark_helper()) { | |
| 3907 // in this case, we have to install the mark word first, | |
| 3908 // otherwise obj looks to be forwarded (the old mark word, | |
| 3909 // which contains the forward pointer, was copied) | |
| 3910 obj->set_mark(m); | |
| 3911 obj->incr_age(); | |
| 3912 } else { | |
| 3913 m = m->incr_age(); | |
| 545 | 3914 obj->set_mark(m); |
| 526 | 3915 } |
| 545 | 3916 _par_scan_state->age_table()->add(obj, word_sz); |
| 3917 } else { | |
| 3918 obj->set_mark(m); | |
| 526 | 3919 } |
| 3920 | |
| 342 | 3921 // preserve "next" mark bit |
| 3922 if (_g1->mark_in_progress() && !_g1->is_obj_ill(old)) { | |
| 3923 if (!use_local_bitmaps || | |
| 3924 !_par_scan_state->alloc_buffer(alloc_purpose)->mark(obj_ptr)) { | |
| 3925 // if we couldn't mark it on the local bitmap (this happens when | |
| 3926 // the object was not allocated in the GCLab), we have to bite | |
| 3927 // the bullet and do the standard parallel mark | |
| 3928 _cm->markAndGrayObjectIfNecessary(obj); | |
| 3929 } | |
| 3930 #if 1 | |
| 3931 if (_g1->isMarkedNext(old)) { | |
| 3932 _cm->nextMarkBitMap()->parClear((HeapWord*)old); | |
| 3933 } | |
| 3934 #endif | |
| 3935 } | |
| 3936 | |
| 3937 size_t* surv_young_words = _par_scan_state->surviving_young_words(); | |
| 3938 surv_young_words[young_index] += word_sz; | |
| 3939 | |
| 3940 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
| 3941 arrayOop(old)->set_length(0); | |
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3942 oop* old_p = set_partial_array_mask(old); |
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3943 _par_scan_state->push_on_queue(old_p); |
| 342 | 3944 } else { |
| 526 | 3945 // No point in using the slower heap_region_containing() method, |
| 3946 // given that we know obj is in the heap. | |
| 3947 _scanner->set_region(_g1->heap_region_containing_raw(obj)); | |
| 342 | 3948 obj->oop_iterate_backwards(_scanner); |
| 3949 } | |
| 3950 } else { | |
| 3951 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
| 3952 obj = forward_ptr; | |
| 3953 } | |
| 3954 return obj; | |
| 3955 } | |
| 3956 | |
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3957 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_forwardee> |
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3958 template <class T> |
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3959 void G1ParCopyClosure <do_gen_barrier, barrier, do_mark_forwardee> |
|
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3960 ::do_oop_work(T* p) { |
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3961 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 3962 assert(barrier != G1BarrierRS || obj != NULL, |
| 3963 "Precondition: G1BarrierRS implies obj is nonNull"); | |
| 3964 | |
| 526 | 3965 // here the null check is implicit in the cset_fast_test() test |
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3966 if (_g1->in_cset_fast_test(obj)) { |
| 342 | 3967 #if G1_REM_SET_LOGGING |
| 526 | 3968 gclog_or_tty->print_cr("Loc "PTR_FORMAT" contains pointer "PTR_FORMAT" " |
| 3969 "into CS.", p, (void*) obj); | |
| 342 | 3970 #endif |
| 526 | 3971 if (obj->is_forwarded()) { |
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3972 oopDesc::encode_store_heap_oop(p, obj->forwardee()); |
| 526 | 3973 } else { |
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3974 oop copy_oop = copy_to_survivor_space(obj); |
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3975 oopDesc::encode_store_heap_oop(p, copy_oop); |
| 342 | 3976 } |
| 526 | 3977 // When scanning the RS, we only care about objs in CS. |
| 3978 if (barrier == G1BarrierRS) { | |
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3979 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 342 | 3980 } |
| 526 | 3981 } |
| 3982 | |
| 3983 if (barrier == G1BarrierEvac && obj != NULL) { | |
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3984 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
| 526 | 3985 } |
| 3986 | |
| 3987 if (do_gen_barrier && obj != NULL) { | |
| 3988 par_do_barrier(p); | |
| 3989 } | |
| 3990 } | |
| 3991 | |
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3992 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(oop* p); |
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3993 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(narrowOop* p); |
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3994 |
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3995 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
| 526 | 3996 assert(has_partial_array_mask(p), "invariant"); |
| 3997 oop old = clear_partial_array_mask(p); | |
| 342 | 3998 assert(old->is_objArray(), "must be obj array"); |
| 3999 assert(old->is_forwarded(), "must be forwarded"); | |
| 4000 assert(Universe::heap()->is_in_reserved(old), "must be in heap."); | |
| 4001 | |
| 4002 objArrayOop obj = objArrayOop(old->forwardee()); | |
| 4003 assert((void*)old != (void*)old->forwardee(), "self forwarding here?"); | |
| 4004 // Process ParGCArrayScanChunk elements now | |
| 4005 // and push the remainder back onto queue | |
| 4006 int start = arrayOop(old)->length(); | |
| 4007 int end = obj->length(); | |
| 4008 int remainder = end - start; | |
| 4009 assert(start <= end, "just checking"); | |
| 4010 if (remainder > 2 * ParGCArrayScanChunk) { | |
| 4011 // Test above combines last partial chunk with a full chunk | |
| 4012 end = start + ParGCArrayScanChunk; | |
| 4013 arrayOop(old)->set_length(end); | |
| 4014 // Push remainder. | |
|
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4015 oop* old_p = set_partial_array_mask(old); |
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4016 assert(arrayOop(old)->length() < obj->length(), "Empty push?"); |
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4017 _par_scan_state->push_on_queue(old_p); |
| 342 | 4018 } else { |
| 4019 // Restore length so that the heap remains parsable in | |
| 4020 // case of evacuation failure. | |
| 4021 arrayOop(old)->set_length(end); | |
| 4022 } | |
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4023 _scanner.set_region(_g1->heap_region_containing_raw(obj)); |
| 342 | 4024 // process our set of indices (include header in first chunk) |
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4025 obj->oop_iterate_range(&_scanner, start, end); |
| 342 | 4026 } |
| 4027 | |
| 4028 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
| 4029 protected: | |
| 4030 G1CollectedHeap* _g1h; | |
| 4031 G1ParScanThreadState* _par_scan_state; | |
| 4032 RefToScanQueueSet* _queues; | |
| 4033 ParallelTaskTerminator* _terminator; | |
| 4034 | |
| 4035 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
| 4036 RefToScanQueueSet* queues() { return _queues; } | |
| 4037 ParallelTaskTerminator* terminator() { return _terminator; } | |
| 4038 | |
| 4039 public: | |
| 4040 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
| 4041 G1ParScanThreadState* par_scan_state, | |
| 4042 RefToScanQueueSet* queues, | |
| 4043 ParallelTaskTerminator* terminator) | |
| 4044 : _g1h(g1h), _par_scan_state(par_scan_state), | |
| 4045 _queues(queues), _terminator(terminator) {} | |
| 4046 | |
| 4047 void do_void() { | |
| 4048 G1ParScanThreadState* pss = par_scan_state(); | |
| 4049 while (true) { | |
| 4050 pss->trim_queue(); | |
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4051 |
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4052 StarTask stolen_task; |
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4053 if (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
| 526 | 4054 // slightly paranoid tests; I'm trying to catch potential |
| 4055 // problems before we go into push_on_queue to know where the | |
| 4056 // problem is coming from | |
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4057 assert((oop*)stolen_task != NULL, "Error"); |
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4058 if (stolen_task.is_narrow()) { |
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4059 assert(UseCompressedOops, "Error"); |
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4060 narrowOop* p = (narrowOop*) stolen_task; |
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4061 assert(has_partial_array_mask(p) || |
|
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4062 _g1h->is_in_g1_reserved(oopDesc::load_decode_heap_oop(p)), "Error"); |
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4063 pss->push_on_queue(p); |
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4064 } else { |
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4065 oop* p = (oop*) stolen_task; |
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4066 assert(has_partial_array_mask(p) || _g1h->is_in_g1_reserved(*p), "Error"); |
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4067 pss->push_on_queue(p); |
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4068 } |
| 342 | 4069 continue; |
| 4070 } | |
| 4071 pss->start_term_time(); | |
| 4072 if (terminator()->offer_termination()) break; | |
| 4073 pss->end_term_time(); | |
| 4074 } | |
| 4075 pss->end_term_time(); | |
| 4076 pss->retire_alloc_buffers(); | |
| 4077 } | |
| 4078 }; | |
| 4079 | |
| 4080 class G1ParTask : public AbstractGangTask { | |
| 4081 protected: | |
| 4082 G1CollectedHeap* _g1h; | |
| 4083 RefToScanQueueSet *_queues; | |
| 4084 ParallelTaskTerminator _terminator; | |
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4085 int _n_workers; |
| 342 | 4086 |
| 4087 Mutex _stats_lock; | |
| 4088 Mutex* stats_lock() { return &_stats_lock; } | |
| 4089 | |
| 4090 size_t getNCards() { | |
| 4091 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
| 4092 / G1BlockOffsetSharedArray::N_bytes; | |
| 4093 } | |
| 4094 | |
| 4095 public: | |
| 4096 G1ParTask(G1CollectedHeap* g1h, int workers, RefToScanQueueSet *task_queues) | |
| 4097 : AbstractGangTask("G1 collection"), | |
| 4098 _g1h(g1h), | |
| 4099 _queues(task_queues), | |
| 4100 _terminator(workers, _queues), | |
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4101 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true), |
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4102 _n_workers(workers) |
| 342 | 4103 {} |
| 4104 | |
| 4105 RefToScanQueueSet* queues() { return _queues; } | |
| 4106 | |
| 4107 RefToScanQueue *work_queue(int i) { | |
| 4108 return queues()->queue(i); | |
| 4109 } | |
| 4110 | |
| 4111 void work(int i) { | |
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4112 if (i >= _n_workers) return; // no work needed this round |
| 1611 | 4113 |
| 4114 double start_time_ms = os::elapsedTime() * 1000.0; | |
| 4115 _g1h->g1_policy()->record_gc_worker_start_time(i, start_time_ms); | |
| 4116 | |
| 342 | 4117 ResourceMark rm; |
| 4118 HandleMark hm; | |
| 4119 | |
| 526 | 4120 G1ParScanThreadState pss(_g1h, i); |
| 4121 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss); | |
| 4122 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss); | |
| 4123 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss); | |
| 342 | 4124 |
| 4125 pss.set_evac_closure(&scan_evac_cl); | |
| 4126 pss.set_evac_failure_closure(&evac_failure_cl); | |
| 4127 pss.set_partial_scan_closure(&partial_scan_cl); | |
| 4128 | |
| 4129 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss); | |
| 4130 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss); | |
| 4131 G1ParScanHeapRSClosure only_scan_heap_rs_cl(_g1h, &pss); | |
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4132 G1ParPushHeapRSClosure push_heap_rs_cl(_g1h, &pss); |
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4133 |
| 342 | 4134 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss); |
| 4135 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss); | |
| 4136 G1ParScanAndMarkHeapRSClosure scan_mark_heap_rs_cl(_g1h, &pss); | |
| 4137 | |
| 4138 OopsInHeapRegionClosure *scan_root_cl; | |
| 4139 OopsInHeapRegionClosure *scan_perm_cl; | |
| 4140 | |
|
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4141 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
| 342 | 4142 scan_root_cl = &scan_mark_root_cl; |
| 4143 scan_perm_cl = &scan_mark_perm_cl; | |
| 4144 } else { | |
| 4145 scan_root_cl = &only_scan_root_cl; | |
| 4146 scan_perm_cl = &only_scan_perm_cl; | |
| 4147 } | |
| 4148 | |
| 4149 pss.start_strong_roots(); | |
| 4150 _g1h->g1_process_strong_roots(/* not collecting perm */ false, | |
| 4151 SharedHeap::SO_AllClasses, | |
| 4152 scan_root_cl, | |
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4153 &push_heap_rs_cl, |
| 342 | 4154 scan_perm_cl, |
| 4155 i); | |
| 4156 pss.end_strong_roots(); | |
| 4157 { | |
| 4158 double start = os::elapsedTime(); | |
| 4159 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); | |
| 4160 evac.do_void(); | |
| 4161 double elapsed_ms = (os::elapsedTime()-start)*1000.0; | |
| 4162 double term_ms = pss.term_time()*1000.0; | |
| 4163 _g1h->g1_policy()->record_obj_copy_time(i, elapsed_ms-term_ms); | |
| 1611 | 4164 _g1h->g1_policy()->record_termination(i, term_ms, pss.term_attempts()); |
| 342 | 4165 } |
| 1282 | 4166 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
| 342 | 4167 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
| 4168 | |
| 4169 // Clean up any par-expanded rem sets. | |
| 4170 HeapRegionRemSet::par_cleanup(); | |
| 4171 | |
| 4172 if (ParallelGCVerbose) { | |
| 1709 | 4173 MutexLocker x(stats_lock()); |
| 4174 pss.print_termination_stats(i); | |
| 342 | 4175 } |
| 4176 | |
| 4177 assert(pss.refs_to_scan() == 0, "Task queue should be empty"); | |
| 4178 assert(pss.overflowed_refs_to_scan() == 0, "Overflow queue should be empty"); | |
| 1611 | 4179 double end_time_ms = os::elapsedTime() * 1000.0; |
| 4180 _g1h->g1_policy()->record_gc_worker_end_time(i, end_time_ms); | |
| 342 | 4181 } |
| 4182 }; | |
| 4183 | |
| 4184 // *** Common G1 Evacuation Stuff | |
| 4185 | |
|
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4186 // This method is run in a GC worker. |
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4187 |
| 342 | 4188 void |
| 4189 G1CollectedHeap:: | |
| 4190 g1_process_strong_roots(bool collecting_perm_gen, | |
| 4191 SharedHeap::ScanningOption so, | |
| 4192 OopClosure* scan_non_heap_roots, | |
| 4193 OopsInHeapRegionClosure* scan_rs, | |
| 4194 OopsInGenClosure* scan_perm, | |
| 4195 int worker_i) { | |
| 4196 // First scan the strong roots, including the perm gen. | |
| 4197 double ext_roots_start = os::elapsedTime(); | |
| 4198 double closure_app_time_sec = 0.0; | |
| 4199 | |
| 4200 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
| 4201 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
| 4202 buf_scan_perm.set_generation(perm_gen()); | |
| 4203 | |
|
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4204 // Walk the code cache w/o buffering, because StarTask cannot handle |
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4205 // unaligned oop locations. |
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4206 CodeBlobToOopClosure eager_scan_code_roots(scan_non_heap_roots, /*do_marking=*/ true); |
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4207 |
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4208 process_strong_roots(false, // no scoping; this is parallel code |
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|
4209 collecting_perm_gen, so, |
| 342 | 4210 &buf_scan_non_heap_roots, |
|
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|
4211 &eager_scan_code_roots, |
| 342 | 4212 &buf_scan_perm); |
|
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4213 |
| 342 | 4214 // Finish up any enqueued closure apps. |
| 4215 buf_scan_non_heap_roots.done(); | |
| 4216 buf_scan_perm.done(); | |
| 4217 double ext_roots_end = os::elapsedTime(); | |
| 4218 g1_policy()->reset_obj_copy_time(worker_i); | |
| 4219 double obj_copy_time_sec = | |
| 4220 buf_scan_non_heap_roots.closure_app_seconds() + | |
| 4221 buf_scan_perm.closure_app_seconds(); | |
| 4222 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); | |
| 4223 double ext_root_time_ms = | |
| 4224 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
| 4225 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); | |
| 4226 | |
| 4227 // Scan strong roots in mark stack. | |
| 4228 if (!_process_strong_tasks->is_task_claimed(G1H_PS_mark_stack_oops_do)) { | |
| 4229 concurrent_mark()->oops_do(scan_non_heap_roots); | |
| 4230 } | |
| 4231 double mark_stack_scan_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; | |
| 4232 g1_policy()->record_mark_stack_scan_time(worker_i, mark_stack_scan_ms); | |
| 4233 | |
| 4234 // XXX What should this be doing in the parallel case? | |
| 4235 g1_policy()->record_collection_pause_end_CH_strong_roots(); | |
| 4236 // Now scan the complement of the collection set. | |
| 4237 if (scan_rs != NULL) { | |
| 4238 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
| 4239 } | |
| 4240 // Finish with the ref_processor roots. | |
| 4241 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { | |
| 4242 ref_processor()->oops_do(scan_non_heap_roots); | |
| 4243 } | |
| 4244 g1_policy()->record_collection_pause_end_G1_strong_roots(); | |
| 4245 _process_strong_tasks->all_tasks_completed(); | |
| 4246 } | |
| 4247 | |
| 4248 void | |
| 4249 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
| 4250 OopClosure* non_root_closure) { | |
|
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4251 CodeBlobToOopClosure roots_in_blobs(root_closure, /*do_marking=*/ false); |
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4252 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs, non_root_closure); |
| 342 | 4253 } |
| 4254 | |
| 4255 | |
| 4256 class SaveMarksClosure: public HeapRegionClosure { | |
| 4257 public: | |
| 4258 bool doHeapRegion(HeapRegion* r) { | |
| 4259 r->save_marks(); | |
| 4260 return false; | |
| 4261 } | |
| 4262 }; | |
| 4263 | |
| 4264 void G1CollectedHeap::save_marks() { | |
|
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|
4265 if (!CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 4266 SaveMarksClosure sm; |
| 4267 heap_region_iterate(&sm); | |
| 4268 } | |
| 4269 // We do this even in the parallel case | |
| 4270 perm_gen()->save_marks(); | |
| 4271 } | |
| 4272 | |
| 4273 void G1CollectedHeap::evacuate_collection_set() { | |
| 4274 set_evacuation_failed(false); | |
| 4275 | |
| 4276 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
| 4277 concurrent_g1_refine()->set_use_cache(false); | |
| 889 | 4278 concurrent_g1_refine()->clear_hot_cache_claimed_index(); |
| 4279 | |
| 342 | 4280 int n_workers = (ParallelGCThreads > 0 ? workers()->total_workers() : 1); |
| 4281 set_par_threads(n_workers); | |
| 4282 G1ParTask g1_par_task(this, n_workers, _task_queues); | |
| 4283 | |
| 4284 init_for_evac_failure(NULL); | |
| 4285 | |
| 4286 rem_set()->prepare_for_younger_refs_iterate(true); | |
|
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4287 |
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4288 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
| 342 | 4289 double start_par = os::elapsedTime(); |
|
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4290 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 4291 // The individual threads will set their evac-failure closures. |
|
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|
4292 StrongRootsScope srs(this); |
| 1709 | 4293 if (ParallelGCVerbose) G1ParScanThreadState::print_termination_stats_hdr(); |
| 342 | 4294 workers()->run_task(&g1_par_task); |
| 4295 } else { | |
|
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|
4296 StrongRootsScope srs(this); |
| 342 | 4297 g1_par_task.work(0); |
| 4298 } | |
| 4299 | |
| 4300 double par_time = (os::elapsedTime() - start_par) * 1000.0; | |
| 4301 g1_policy()->record_par_time(par_time); | |
| 4302 set_par_threads(0); | |
| 4303 // Is this the right thing to do here? We don't save marks | |
| 4304 // on individual heap regions when we allocate from | |
| 4305 // them in parallel, so this seems like the correct place for this. | |
| 545 | 4306 retire_all_alloc_regions(); |
| 342 | 4307 { |
| 4308 G1IsAliveClosure is_alive(this); | |
| 4309 G1KeepAliveClosure keep_alive(this); | |
| 4310 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
| 4311 } | |
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4312 release_gc_alloc_regions(false /* totally */); |
| 342 | 4313 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); |
|
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4314 |
| 889 | 4315 concurrent_g1_refine()->clear_hot_cache(); |
| 342 | 4316 concurrent_g1_refine()->set_use_cache(true); |
| 4317 | |
| 4318 finalize_for_evac_failure(); | |
| 4319 | |
| 4320 // Must do this before removing self-forwarding pointers, which clears | |
| 4321 // the per-region evac-failure flags. | |
| 4322 concurrent_mark()->complete_marking_in_collection_set(); | |
| 4323 | |
| 4324 if (evacuation_failed()) { | |
| 4325 remove_self_forwarding_pointers(); | |
| 4326 if (PrintGCDetails) { | |
|
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|
4327 gclog_or_tty->print(" (to-space overflow)"); |
| 342 | 4328 } else if (PrintGC) { |
| 4329 gclog_or_tty->print("--"); | |
| 4330 } | |
| 4331 } | |
| 4332 | |
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4333 if (G1DeferredRSUpdate) { |
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4334 RedirtyLoggedCardTableEntryFastClosure redirty; |
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4335 dirty_card_queue_set().set_closure(&redirty); |
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4336 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
| 1111 | 4337 |
| 4338 DirtyCardQueueSet& dcq = JavaThread::dirty_card_queue_set(); | |
| 4339 dcq.merge_bufferlists(&dirty_card_queue_set()); | |
|
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4340 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
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|
4341 } |
| 342 | 4342 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
| 4343 } | |
| 4344 | |
| 4345 void G1CollectedHeap::free_region(HeapRegion* hr) { | |
| 4346 size_t pre_used = 0; | |
| 4347 size_t cleared_h_regions = 0; | |
| 4348 size_t freed_regions = 0; | |
| 4349 UncleanRegionList local_list; | |
| 4350 | |
| 4351 HeapWord* start = hr->bottom(); | |
| 4352 HeapWord* end = hr->prev_top_at_mark_start(); | |
| 4353 size_t used_bytes = hr->used(); | |
| 4354 size_t live_bytes = hr->max_live_bytes(); | |
| 4355 if (used_bytes > 0) { | |
| 4356 guarantee( live_bytes <= used_bytes, "invariant" ); | |
| 4357 } else { | |
| 4358 guarantee( live_bytes == 0, "invariant" ); | |
| 4359 } | |
| 4360 | |
| 4361 size_t garbage_bytes = used_bytes - live_bytes; | |
| 4362 if (garbage_bytes > 0) | |
| 4363 g1_policy()->decrease_known_garbage_bytes(garbage_bytes); | |
| 4364 | |
| 4365 free_region_work(hr, pre_used, cleared_h_regions, freed_regions, | |
| 4366 &local_list); | |
| 4367 finish_free_region_work(pre_used, cleared_h_regions, freed_regions, | |
| 4368 &local_list); | |
| 4369 } | |
| 4370 | |
| 4371 void | |
| 4372 G1CollectedHeap::free_region_work(HeapRegion* hr, | |
| 4373 size_t& pre_used, | |
| 4374 size_t& cleared_h_regions, | |
| 4375 size_t& freed_regions, | |
| 4376 UncleanRegionList* list, | |
| 4377 bool par) { | |
| 4378 pre_used += hr->used(); | |
| 4379 if (hr->isHumongous()) { | |
| 4380 assert(hr->startsHumongous(), | |
| 4381 "Only the start of a humongous region should be freed."); | |
| 4382 int ind = _hrs->find(hr); | |
| 4383 assert(ind != -1, "Should have an index."); | |
| 4384 // Clear the start region. | |
| 4385 hr->hr_clear(par, true /*clear_space*/); | |
| 4386 list->insert_before_head(hr); | |
| 4387 cleared_h_regions++; | |
| 4388 freed_regions++; | |
| 4389 // Clear any continued regions. | |
| 4390 ind++; | |
| 4391 while ((size_t)ind < n_regions()) { | |
| 4392 HeapRegion* hrc = _hrs->at(ind); | |
| 4393 if (!hrc->continuesHumongous()) break; | |
| 4394 // Otherwise, does continue the H region. | |
| 4395 assert(hrc->humongous_start_region() == hr, "Huh?"); | |
| 4396 hrc->hr_clear(par, true /*clear_space*/); | |
| 4397 cleared_h_regions++; | |
| 4398 freed_regions++; | |
| 4399 list->insert_before_head(hrc); | |
| 4400 ind++; | |
| 4401 } | |
| 4402 } else { | |
| 4403 hr->hr_clear(par, true /*clear_space*/); | |
| 4404 list->insert_before_head(hr); | |
| 4405 freed_regions++; | |
| 4406 // If we're using clear2, this should not be enabled. | |
| 4407 // assert(!hr->in_cohort(), "Can't be both free and in a cohort."); | |
| 4408 } | |
| 4409 } | |
| 4410 | |
| 4411 void G1CollectedHeap::finish_free_region_work(size_t pre_used, | |
| 4412 size_t cleared_h_regions, | |
| 4413 size_t freed_regions, | |
| 4414 UncleanRegionList* list) { | |
| 4415 if (list != NULL && list->sz() > 0) { | |
| 4416 prepend_region_list_on_unclean_list(list); | |
| 4417 } | |
| 4418 // Acquire a lock, if we're parallel, to update possibly-shared | |
| 4419 // variables. | |
| 4420 Mutex* lock = (n_par_threads() > 0) ? ParGCRareEvent_lock : NULL; | |
| 4421 { | |
| 4422 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); | |
| 4423 _summary_bytes_used -= pre_used; | |
| 4424 _num_humongous_regions -= (int) cleared_h_regions; | |
| 4425 _free_regions += freed_regions; | |
| 4426 } | |
| 4427 } | |
| 4428 | |
| 4429 | |
| 4430 void G1CollectedHeap::dirtyCardsForYoungRegions(CardTableModRefBS* ct_bs, HeapRegion* list) { | |
| 4431 while (list != NULL) { | |
| 4432 guarantee( list->is_young(), "invariant" ); | |
| 4433 | |
| 4434 HeapWord* bottom = list->bottom(); | |
| 4435 HeapWord* end = list->end(); | |
| 4436 MemRegion mr(bottom, end); | |
| 4437 ct_bs->dirty(mr); | |
| 4438 | |
| 4439 list = list->get_next_young_region(); | |
| 4440 } | |
| 4441 } | |
| 4442 | |
|
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4443 |
|
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4444 class G1ParCleanupCTTask : public AbstractGangTask { |
|
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4445 CardTableModRefBS* _ct_bs; |
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4446 G1CollectedHeap* _g1h; |
|
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4447 HeapRegion* volatile _su_head; |
|
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4448 public: |
|
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|
4449 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
|
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4450 G1CollectedHeap* g1h, |
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|
4451 HeapRegion* survivor_list) : |
|
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4452 AbstractGangTask("G1 Par Cleanup CT Task"), |
|
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4453 _ct_bs(ct_bs), |
|
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4454 _g1h(g1h), |
|
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|
4455 _su_head(survivor_list) |
|
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4456 { } |
|
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4457 |
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4458 void work(int i) { |
|
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4459 HeapRegion* r; |
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4460 while (r = _g1h->pop_dirty_cards_region()) { |
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4461 clear_cards(r); |
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4462 } |
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4463 // Redirty the cards of the survivor regions. |
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4464 dirty_list(&this->_su_head); |
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4465 } |
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4466 |
|
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4467 void clear_cards(HeapRegion* r) { |
|
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4468 // Cards for Survivor regions will be dirtied later. |
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4469 if (!r->is_survivor()) { |
|
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4470 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
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4471 } |
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4472 } |
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4473 |
|
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|
4474 void dirty_list(HeapRegion* volatile * head_ptr) { |
|
8624da129f0b
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|
4475 HeapRegion* head; |
|
8624da129f0b
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|
4476 do { |
|
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|
4477 // Pop region off the list. |
|
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|
4478 head = *head_ptr; |
|
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|
4479 if (head != NULL) { |
|
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|
4480 HeapRegion* r = (HeapRegion*) |
|
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|
4481 Atomic::cmpxchg_ptr(head->get_next_young_region(), head_ptr, head); |
|
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|
4482 if (r == head) { |
|
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|
4483 assert(!r->isHumongous(), "Humongous regions shouldn't be on survivor list"); |
|
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|
4484 _ct_bs->dirty(MemRegion(r->bottom(), r->end())); |
|
8624da129f0b
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|
4485 } |
|
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|
4486 } |
|
8624da129f0b
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|
4487 } while (*head_ptr != NULL); |
|
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|
4488 } |
|
796
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|
4489 }; |
|
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|
4490 |
|
29e7d79232b9
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|
4491 |
|
940
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|
4492 #ifndef PRODUCT |
|
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|
4493 class G1VerifyCardTableCleanup: public HeapRegionClosure { |
|
8624da129f0b
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|
4494 CardTableModRefBS* _ct_bs; |
|
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|
4495 public: |
|
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|
4496 G1VerifyCardTableCleanup(CardTableModRefBS* ct_bs) |
|
8624da129f0b
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|
4497 : _ct_bs(ct_bs) |
|
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|
4498 { } |
|
8624da129f0b
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|
4499 virtual bool doHeapRegion(HeapRegion* r) |
|
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|
4500 { |
|
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|
4501 MemRegion mr(r->bottom(), r->end()); |
|
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|
4502 if (r->is_survivor()) { |
|
940
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|
4503 _ct_bs->verify_dirty_region(mr); |
|
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|
4504 } else { |
|
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|
4505 _ct_bs->verify_clean_region(mr); |
|
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|
4506 } |
|
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|
4507 return false; |
|
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|
4508 } |
|
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|
4509 }; |
|
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|
4510 #endif |
|
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|
4511 |
| 342 | 4512 void G1CollectedHeap::cleanUpCardTable() { |
| 4513 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
| 4514 double start = os::elapsedTime(); | |
| 4515 | |
|
796
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|
4516 // Iterate over the dirty cards region list. |
|
940
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|
4517 G1ParCleanupCTTask cleanup_task(ct_bs, this, |
|
8624da129f0b
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|
4518 _young_list->first_survivor_region()); |
|
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|
4519 |
|
796
29e7d79232b9
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|
4520 if (ParallelGCThreads > 0) { |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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diff
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|
4521 set_par_threads(workers()->total_workers()); |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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|
4522 workers()->run_task(&cleanup_task); |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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diff
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|
4523 set_par_threads(0); |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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diff
changeset
|
4524 } else { |
|
29e7d79232b9
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diff
changeset
|
4525 while (_dirty_cards_region_list) { |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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diff
changeset
|
4526 HeapRegion* r = _dirty_cards_region_list; |
|
29e7d79232b9
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|
4527 cleanup_task.clear_cards(r); |
|
29e7d79232b9
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diff
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|
4528 _dirty_cards_region_list = r->get_next_dirty_cards_region(); |
|
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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diff
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|
4529 if (_dirty_cards_region_list == r) { |
|
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diff
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|
4530 // The last region. |
|
29e7d79232b9
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changeset
|
4531 _dirty_cards_region_list = NULL; |
|
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diff
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|
4532 } |
|
29e7d79232b9
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diff
changeset
|
4533 r->set_next_dirty_cards_region(NULL); |
|
29e7d79232b9
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diff
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|
4534 } |
|
1394
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
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|
4535 // now, redirty the cards of the survivor regions |
|
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
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936
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|
4536 // (it seemed faster to do it this way, instead of iterating over |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
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|
4537 // all regions and then clearing / dirtying as appropriate) |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
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changeset
|
4538 dirtyCardsForYoungRegions(ct_bs, _young_list->first_survivor_region()); |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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|
4539 } |
|
1394
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diff
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|
4540 |
| 342 | 4541 double elapsed = os::elapsedTime() - start; |
| 4542 g1_policy()->record_clear_ct_time( elapsed * 1000.0); | |
|
940
8624da129f0b
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936
diff
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|
4543 #ifndef PRODUCT |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
4544 if (G1VerifyCTCleanup || VerifyAfterGC) { |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
4545 G1VerifyCardTableCleanup cleanup_verifier(ct_bs); |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
4546 heap_region_iterate(&cleanup_verifier); |
|
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
4547 } |
|
8624da129f0b
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apetrusenko
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936
diff
changeset
|
4548 #endif |
| 342 | 4549 } |
| 4550 | |
| 4551 void G1CollectedHeap::do_collection_pause_if_appropriate(size_t word_size) { | |
| 4552 if (g1_policy()->should_do_collection_pause(word_size)) { | |
| 4553 do_collection_pause(); | |
| 4554 } | |
| 4555 } | |
| 4556 | |
| 4557 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
| 4558 double young_time_ms = 0.0; | |
| 4559 double non_young_time_ms = 0.0; | |
| 4560 | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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1391
diff
changeset
|
4561 // Since the collection set is a superset of the the young list, |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
4562 // all we need to do to clear the young list is clear its |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4563 // head and length, and unlink any young regions in the code below |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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1391
diff
changeset
|
4564 _young_list->clear(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
4565 |
| 342 | 4566 G1CollectorPolicy* policy = g1_policy(); |
| 4567 | |
| 4568 double start_sec = os::elapsedTime(); | |
| 4569 bool non_young = true; | |
| 4570 | |
| 4571 HeapRegion* cur = cs_head; | |
| 4572 int age_bound = -1; | |
| 4573 size_t rs_lengths = 0; | |
| 4574 | |
| 4575 while (cur != NULL) { | |
| 4576 if (non_young) { | |
| 4577 if (cur->is_young()) { | |
| 4578 double end_sec = os::elapsedTime(); | |
| 4579 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 4580 non_young_time_ms += elapsed_ms; | |
| 4581 | |
| 4582 start_sec = os::elapsedTime(); | |
| 4583 non_young = false; | |
| 4584 } | |
| 4585 } else { | |
| 4586 if (!cur->is_on_free_list()) { | |
| 4587 double end_sec = os::elapsedTime(); | |
| 4588 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 4589 young_time_ms += elapsed_ms; | |
| 4590 | |
| 4591 start_sec = os::elapsedTime(); | |
| 4592 non_young = true; | |
| 4593 } | |
| 4594 } | |
| 4595 | |
| 4596 rs_lengths += cur->rem_set()->occupied(); | |
| 4597 | |
| 4598 HeapRegion* next = cur->next_in_collection_set(); | |
| 4599 assert(cur->in_collection_set(), "bad CS"); | |
| 4600 cur->set_next_in_collection_set(NULL); | |
| 4601 cur->set_in_collection_set(false); | |
| 4602 | |
| 4603 if (cur->is_young()) { | |
| 4604 int index = cur->young_index_in_cset(); | |
| 4605 guarantee( index != -1, "invariant" ); | |
| 4606 guarantee( (size_t)index < policy->young_cset_length(), "invariant" ); | |
| 4607 size_t words_survived = _surviving_young_words[index]; | |
| 4608 cur->record_surv_words_in_group(words_survived); | |
|
1394
1316cec51b4d
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changeset
|
4609 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
4610 // At this point the we have 'popped' cur from the collection set |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
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|
4611 // (linked via next_in_collection_set()) but it is still in the |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
4612 // young list (linked via next_young_region()). Clear the |
|
1316cec51b4d
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diff
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|
4613 // _next_young_region field. |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
4614 cur->set_next_young_region(NULL); |
| 342 | 4615 } else { |
| 4616 int index = cur->young_index_in_cset(); | |
| 4617 guarantee( index == -1, "invariant" ); | |
| 4618 } | |
| 4619 | |
| 4620 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
| 4621 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
| 4622 "invariant" ); | |
| 4623 | |
| 4624 if (!cur->evacuation_failed()) { | |
| 4625 // And the region is empty. | |
| 4626 assert(!cur->is_empty(), | |
| 4627 "Should not have empty regions in a CS."); | |
| 4628 free_region(cur); | |
| 4629 } else { | |
| 4630 cur->uninstall_surv_rate_group(); | |
| 4631 if (cur->is_young()) | |
| 4632 cur->set_young_index_in_cset(-1); | |
| 4633 cur->set_not_young(); | |
| 4634 cur->set_evacuation_failed(false); | |
| 4635 } | |
| 4636 cur = next; | |
| 4637 } | |
| 4638 | |
| 4639 policy->record_max_rs_lengths(rs_lengths); | |
| 4640 policy->cset_regions_freed(); | |
| 4641 | |
| 4642 double end_sec = os::elapsedTime(); | |
| 4643 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
| 4644 if (non_young) | |
| 4645 non_young_time_ms += elapsed_ms; | |
| 4646 else | |
| 4647 young_time_ms += elapsed_ms; | |
| 4648 | |
| 4649 policy->record_young_free_cset_time_ms(young_time_ms); | |
| 4650 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
| 4651 } | |
| 4652 | |
|
1394
1316cec51b4d
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1391
diff
changeset
|
4653 // This routine is similar to the above but does not record |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
4654 // any policy statistics or update free lists; we are abandoning |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
4655 // the current incremental collection set in preparation of a |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
4656 // full collection. After the full GC we will start to build up |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
4657 // the incremental collection set again. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
4658 // This is only called when we're doing a full collection |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
4659 // and is immediately followed by the tearing down of the young list. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4660 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
4661 void G1CollectedHeap::abandon_collection_set(HeapRegion* cs_head) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
4662 HeapRegion* cur = cs_head; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
4663 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
4664 while (cur != NULL) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
4665 HeapRegion* next = cur->next_in_collection_set(); |
|
1316cec51b4d
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parents:
1391
diff
changeset
|
4666 assert(cur->in_collection_set(), "bad CS"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
4667 cur->set_next_in_collection_set(NULL); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
4668 cur->set_in_collection_set(false); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
4669 cur->set_young_index_in_cset(-1); |
|
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|
4670 cur = next; |
|
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|
4671 } |
|
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|
4672 } |
|
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|
4673 |
| 342 | 4674 HeapRegion* |
| 4675 G1CollectedHeap::alloc_region_from_unclean_list_locked(bool zero_filled) { | |
| 4676 assert(ZF_mon->owned_by_self(), "Precondition"); | |
| 4677 HeapRegion* res = pop_unclean_region_list_locked(); | |
| 4678 if (res != NULL) { | |
| 4679 assert(!res->continuesHumongous() && | |
| 4680 res->zero_fill_state() != HeapRegion::Allocated, | |
| 4681 "Only free regions on unclean list."); | |
| 4682 if (zero_filled) { | |
| 4683 res->ensure_zero_filled_locked(); | |
| 4684 res->set_zero_fill_allocated(); | |
| 4685 } | |
| 4686 } | |
| 4687 return res; | |
| 4688 } | |
| 4689 | |
| 4690 HeapRegion* G1CollectedHeap::alloc_region_from_unclean_list(bool zero_filled) { | |
| 4691 MutexLockerEx zx(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4692 return alloc_region_from_unclean_list_locked(zero_filled); | |
| 4693 } | |
| 4694 | |
| 4695 void G1CollectedHeap::put_region_on_unclean_list(HeapRegion* r) { | |
| 4696 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4697 put_region_on_unclean_list_locked(r); | |
| 4698 if (should_zf()) ZF_mon->notify_all(); // Wake up ZF thread. | |
| 4699 } | |
| 4700 | |
| 4701 void G1CollectedHeap::set_unclean_regions_coming(bool b) { | |
| 4702 MutexLockerEx x(Cleanup_mon); | |
| 4703 set_unclean_regions_coming_locked(b); | |
| 4704 } | |
| 4705 | |
| 4706 void G1CollectedHeap::set_unclean_regions_coming_locked(bool b) { | |
| 4707 assert(Cleanup_mon->owned_by_self(), "Precondition"); | |
| 4708 _unclean_regions_coming = b; | |
| 4709 // Wake up mutator threads that might be waiting for completeCleanup to | |
| 4710 // finish. | |
| 4711 if (!b) Cleanup_mon->notify_all(); | |
| 4712 } | |
| 4713 | |
| 4714 void G1CollectedHeap::wait_for_cleanup_complete() { | |
| 4715 MutexLockerEx x(Cleanup_mon); | |
| 4716 wait_for_cleanup_complete_locked(); | |
| 4717 } | |
| 4718 | |
| 4719 void G1CollectedHeap::wait_for_cleanup_complete_locked() { | |
| 4720 assert(Cleanup_mon->owned_by_self(), "precondition"); | |
| 4721 while (_unclean_regions_coming) { | |
| 4722 Cleanup_mon->wait(); | |
| 4723 } | |
| 4724 } | |
| 4725 | |
| 4726 void | |
| 4727 G1CollectedHeap::put_region_on_unclean_list_locked(HeapRegion* r) { | |
| 4728 assert(ZF_mon->owned_by_self(), "precondition."); | |
|
1545
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4729 #ifdef ASSERT |
|
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4730 if (r->is_gc_alloc_region()) { |
|
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4731 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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|
4732 stringStream region_str; |
|
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|
4733 print_on(®ion_str); |
|
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|
4734 assert(!r->is_gc_alloc_region(), err_msg("Unexpected GC allocation region: %s", |
|
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|
4735 region_str.as_string())); |
|
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|
4736 } |
|
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|
4737 #endif |
| 342 | 4738 _unclean_region_list.insert_before_head(r); |
| 4739 } | |
| 4740 | |
| 4741 void | |
| 4742 G1CollectedHeap::prepend_region_list_on_unclean_list(UncleanRegionList* list) { | |
| 4743 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4744 prepend_region_list_on_unclean_list_locked(list); | |
| 4745 if (should_zf()) ZF_mon->notify_all(); // Wake up ZF thread. | |
| 4746 } | |
| 4747 | |
| 4748 void | |
| 4749 G1CollectedHeap:: | |
| 4750 prepend_region_list_on_unclean_list_locked(UncleanRegionList* list) { | |
| 4751 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4752 _unclean_region_list.prepend_list(list); | |
| 4753 } | |
| 4754 | |
| 4755 HeapRegion* G1CollectedHeap::pop_unclean_region_list_locked() { | |
| 4756 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4757 HeapRegion* res = _unclean_region_list.pop(); | |
| 4758 if (res != NULL) { | |
| 4759 // Inform ZF thread that there's a new unclean head. | |
| 4760 if (_unclean_region_list.hd() != NULL && should_zf()) | |
| 4761 ZF_mon->notify_all(); | |
| 4762 } | |
| 4763 return res; | |
| 4764 } | |
| 4765 | |
| 4766 HeapRegion* G1CollectedHeap::peek_unclean_region_list_locked() { | |
| 4767 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4768 return _unclean_region_list.hd(); | |
| 4769 } | |
| 4770 | |
| 4771 | |
| 4772 bool G1CollectedHeap::move_cleaned_region_to_free_list_locked() { | |
| 4773 assert(ZF_mon->owned_by_self(), "Precondition"); | |
| 4774 HeapRegion* r = peek_unclean_region_list_locked(); | |
| 4775 if (r != NULL && r->zero_fill_state() == HeapRegion::ZeroFilled) { | |
| 4776 // Result of below must be equal to "r", since we hold the lock. | |
| 4777 (void)pop_unclean_region_list_locked(); | |
| 4778 put_free_region_on_list_locked(r); | |
| 4779 return true; | |
| 4780 } else { | |
| 4781 return false; | |
| 4782 } | |
| 4783 } | |
| 4784 | |
| 4785 bool G1CollectedHeap::move_cleaned_region_to_free_list() { | |
| 4786 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4787 return move_cleaned_region_to_free_list_locked(); | |
| 4788 } | |
| 4789 | |
| 4790 | |
| 4791 void G1CollectedHeap::put_free_region_on_list_locked(HeapRegion* r) { | |
| 4792 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4793 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 4794 assert(r->zero_fill_state() == HeapRegion::ZeroFilled, | |
| 4795 "Regions on free list must be zero filled"); | |
| 4796 assert(!r->isHumongous(), "Must not be humongous."); | |
| 4797 assert(r->is_empty(), "Better be empty"); | |
| 4798 assert(!r->is_on_free_list(), | |
| 4799 "Better not already be on free list"); | |
| 4800 assert(!r->is_on_unclean_list(), | |
| 4801 "Better not already be on unclean list"); | |
| 4802 r->set_on_free_list(true); | |
| 4803 r->set_next_on_free_list(_free_region_list); | |
| 4804 _free_region_list = r; | |
| 4805 _free_region_list_size++; | |
| 4806 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 4807 } | |
| 4808 | |
| 4809 void G1CollectedHeap::put_free_region_on_list(HeapRegion* r) { | |
| 4810 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4811 put_free_region_on_list_locked(r); | |
| 4812 } | |
| 4813 | |
| 4814 HeapRegion* G1CollectedHeap::pop_free_region_list_locked() { | |
| 4815 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4816 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 4817 HeapRegion* res = _free_region_list; | |
| 4818 if (res != NULL) { | |
| 4819 _free_region_list = res->next_from_free_list(); | |
| 4820 _free_region_list_size--; | |
| 4821 res->set_on_free_list(false); | |
| 4822 res->set_next_on_free_list(NULL); | |
| 4823 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 4824 } | |
| 4825 return res; | |
| 4826 } | |
| 4827 | |
| 4828 | |
| 4829 HeapRegion* G1CollectedHeap::alloc_free_region_from_lists(bool zero_filled) { | |
| 4830 // By self, or on behalf of self. | |
| 4831 assert(Heap_lock->is_locked(), "Precondition"); | |
| 4832 HeapRegion* res = NULL; | |
| 4833 bool first = true; | |
| 4834 while (res == NULL) { | |
| 4835 if (zero_filled || !first) { | |
| 4836 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4837 res = pop_free_region_list_locked(); | |
| 4838 if (res != NULL) { | |
| 4839 assert(!res->zero_fill_is_allocated(), | |
| 4840 "No allocated regions on free list."); | |
| 4841 res->set_zero_fill_allocated(); | |
| 4842 } else if (!first) { | |
| 4843 break; // We tried both, time to return NULL. | |
| 4844 } | |
| 4845 } | |
| 4846 | |
| 4847 if (res == NULL) { | |
| 4848 res = alloc_region_from_unclean_list(zero_filled); | |
| 4849 } | |
| 4850 assert(res == NULL || | |
| 4851 !zero_filled || | |
| 4852 res->zero_fill_is_allocated(), | |
| 4853 "We must have allocated the region we're returning"); | |
| 4854 first = false; | |
| 4855 } | |
| 4856 return res; | |
| 4857 } | |
| 4858 | |
| 4859 void G1CollectedHeap::remove_allocated_regions_from_lists() { | |
| 4860 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4861 { | |
| 4862 HeapRegion* prev = NULL; | |
| 4863 HeapRegion* cur = _unclean_region_list.hd(); | |
| 4864 while (cur != NULL) { | |
| 4865 HeapRegion* next = cur->next_from_unclean_list(); | |
| 4866 if (cur->zero_fill_is_allocated()) { | |
| 4867 // Remove from the list. | |
| 4868 if (prev == NULL) { | |
| 4869 (void)_unclean_region_list.pop(); | |
| 4870 } else { | |
| 4871 _unclean_region_list.delete_after(prev); | |
| 4872 } | |
| 4873 cur->set_on_unclean_list(false); | |
| 4874 cur->set_next_on_unclean_list(NULL); | |
| 4875 } else { | |
| 4876 prev = cur; | |
| 4877 } | |
| 4878 cur = next; | |
| 4879 } | |
| 4880 assert(_unclean_region_list.sz() == unclean_region_list_length(), | |
| 4881 "Inv"); | |
| 4882 } | |
| 4883 | |
| 4884 { | |
| 4885 HeapRegion* prev = NULL; | |
| 4886 HeapRegion* cur = _free_region_list; | |
| 4887 while (cur != NULL) { | |
| 4888 HeapRegion* next = cur->next_from_free_list(); | |
| 4889 if (cur->zero_fill_is_allocated()) { | |
| 4890 // Remove from the list. | |
| 4891 if (prev == NULL) { | |
| 4892 _free_region_list = cur->next_from_free_list(); | |
| 4893 } else { | |
| 4894 prev->set_next_on_free_list(cur->next_from_free_list()); | |
| 4895 } | |
| 4896 cur->set_on_free_list(false); | |
| 4897 cur->set_next_on_free_list(NULL); | |
| 4898 _free_region_list_size--; | |
| 4899 } else { | |
| 4900 prev = cur; | |
| 4901 } | |
| 4902 cur = next; | |
| 4903 } | |
| 4904 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 4905 } | |
| 4906 } | |
| 4907 | |
| 4908 bool G1CollectedHeap::verify_region_lists() { | |
| 4909 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 4910 return verify_region_lists_locked(); | |
| 4911 } | |
| 4912 | |
| 4913 bool G1CollectedHeap::verify_region_lists_locked() { | |
| 4914 HeapRegion* unclean = _unclean_region_list.hd(); | |
| 4915 while (unclean != NULL) { | |
| 4916 guarantee(unclean->is_on_unclean_list(), "Well, it is!"); | |
| 4917 guarantee(!unclean->is_on_free_list(), "Well, it shouldn't be!"); | |
| 4918 guarantee(unclean->zero_fill_state() != HeapRegion::Allocated, | |
| 4919 "Everything else is possible."); | |
| 4920 unclean = unclean->next_from_unclean_list(); | |
| 4921 } | |
| 4922 guarantee(_unclean_region_list.sz() == unclean_region_list_length(), "Inv"); | |
| 4923 | |
| 4924 HeapRegion* free_r = _free_region_list; | |
| 4925 while (free_r != NULL) { | |
| 4926 assert(free_r->is_on_free_list(), "Well, it is!"); | |
| 4927 assert(!free_r->is_on_unclean_list(), "Well, it shouldn't be!"); | |
| 4928 switch (free_r->zero_fill_state()) { | |
| 4929 case HeapRegion::NotZeroFilled: | |
| 4930 case HeapRegion::ZeroFilling: | |
| 4931 guarantee(false, "Should not be on free list."); | |
| 4932 break; | |
| 4933 default: | |
| 4934 // Everything else is possible. | |
| 4935 break; | |
| 4936 } | |
| 4937 free_r = free_r->next_from_free_list(); | |
| 4938 } | |
| 4939 guarantee(_free_region_list_size == free_region_list_length(), "Inv"); | |
| 4940 // If we didn't do an assertion... | |
| 4941 return true; | |
| 4942 } | |
| 4943 | |
| 4944 size_t G1CollectedHeap::free_region_list_length() { | |
| 4945 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4946 size_t len = 0; | |
| 4947 HeapRegion* cur = _free_region_list; | |
| 4948 while (cur != NULL) { | |
| 4949 len++; | |
| 4950 cur = cur->next_from_free_list(); | |
| 4951 } | |
| 4952 return len; | |
| 4953 } | |
| 4954 | |
| 4955 size_t G1CollectedHeap::unclean_region_list_length() { | |
| 4956 assert(ZF_mon->owned_by_self(), "precondition."); | |
| 4957 return _unclean_region_list.length(); | |
| 4958 } | |
| 4959 | |
| 4960 size_t G1CollectedHeap::n_regions() { | |
| 4961 return _hrs->length(); | |
| 4962 } | |
| 4963 | |
| 4964 size_t G1CollectedHeap::max_regions() { | |
| 4965 return | |
| 4966 (size_t)align_size_up(g1_reserved_obj_bytes(), HeapRegion::GrainBytes) / | |
| 4967 HeapRegion::GrainBytes; | |
| 4968 } | |
| 4969 | |
| 4970 size_t G1CollectedHeap::free_regions() { | |
| 4971 /* Possibly-expensive assert. | |
| 4972 assert(_free_regions == count_free_regions(), | |
| 4973 "_free_regions is off."); | |
| 4974 */ | |
| 4975 return _free_regions; | |
| 4976 } | |
| 4977 | |
| 4978 bool G1CollectedHeap::should_zf() { | |
| 4979 return _free_region_list_size < (size_t) G1ConcZFMaxRegions; | |
| 4980 } | |
| 4981 | |
| 4982 class RegionCounter: public HeapRegionClosure { | |
| 4983 size_t _n; | |
| 4984 public: | |
| 4985 RegionCounter() : _n(0) {} | |
| 4986 bool doHeapRegion(HeapRegion* r) { | |
| 677 | 4987 if (r->is_empty()) { |
| 342 | 4988 assert(!r->isHumongous(), "H regions should not be empty."); |
| 4989 _n++; | |
| 4990 } | |
| 4991 return false; | |
| 4992 } | |
| 4993 int res() { return (int) _n; } | |
| 4994 }; | |
| 4995 | |
| 4996 size_t G1CollectedHeap::count_free_regions() { | |
| 4997 RegionCounter rc; | |
| 4998 heap_region_iterate(&rc); | |
| 4999 size_t n = rc.res(); | |
| 5000 if (_cur_alloc_region != NULL && _cur_alloc_region->is_empty()) | |
| 5001 n--; | |
| 5002 return n; | |
| 5003 } | |
| 5004 | |
| 5005 size_t G1CollectedHeap::count_free_regions_list() { | |
| 5006 size_t n = 0; | |
| 5007 size_t o = 0; | |
| 5008 ZF_mon->lock_without_safepoint_check(); | |
| 5009 HeapRegion* cur = _free_region_list; | |
| 5010 while (cur != NULL) { | |
| 5011 cur = cur->next_from_free_list(); | |
| 5012 n++; | |
| 5013 } | |
| 5014 size_t m = unclean_region_list_length(); | |
| 5015 ZF_mon->unlock(); | |
| 5016 return n + m; | |
| 5017 } | |
| 5018 | |
| 5019 bool G1CollectedHeap::should_set_young_locked() { | |
| 5020 assert(heap_lock_held_for_gc(), | |
| 5021 "the heap lock should already be held by or for this thread"); | |
| 5022 return (g1_policy()->in_young_gc_mode() && | |
| 5023 g1_policy()->should_add_next_region_to_young_list()); | |
| 5024 } | |
| 5025 | |
| 5026 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
| 5027 assert(heap_lock_held_for_gc(), | |
| 5028 "the heap lock should already be held by or for this thread"); | |
| 5029 _young_list->push_region(hr); | |
| 5030 g1_policy()->set_region_short_lived(hr); | |
| 5031 } | |
| 5032 | |
| 5033 class NoYoungRegionsClosure: public HeapRegionClosure { | |
| 5034 private: | |
| 5035 bool _success; | |
| 5036 public: | |
| 5037 NoYoungRegionsClosure() : _success(true) { } | |
| 5038 bool doHeapRegion(HeapRegion* r) { | |
| 5039 if (r->is_young()) { | |
| 5040 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
| 5041 r->bottom(), r->end()); | |
| 5042 _success = false; | |
| 5043 } | |
| 5044 return false; | |
| 5045 } | |
| 5046 bool success() { return _success; } | |
| 5047 }; | |
| 5048 | |
|
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5049 bool G1CollectedHeap::check_young_list_empty(bool check_heap, bool check_sample) { |
|
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5050 bool ret = _young_list->check_list_empty(check_sample); |
|
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5051 |
|
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|
5052 if (check_heap) { |
| 342 | 5053 NoYoungRegionsClosure closure; |
| 5054 heap_region_iterate(&closure); | |
| 5055 ret = ret && closure.success(); | |
| 5056 } | |
| 5057 | |
| 5058 return ret; | |
| 5059 } | |
| 5060 | |
| 5061 void G1CollectedHeap::empty_young_list() { | |
| 5062 assert(heap_lock_held_for_gc(), | |
| 5063 "the heap lock should already be held by or for this thread"); | |
| 5064 assert(g1_policy()->in_young_gc_mode(), "should be in young GC mode"); | |
| 5065 | |
| 5066 _young_list->empty_list(); | |
| 5067 } | |
| 5068 | |
| 5069 bool G1CollectedHeap::all_alloc_regions_no_allocs_since_save_marks() { | |
| 5070 bool no_allocs = true; | |
| 5071 for (int ap = 0; ap < GCAllocPurposeCount && no_allocs; ++ap) { | |
| 5072 HeapRegion* r = _gc_alloc_regions[ap]; | |
| 5073 no_allocs = r == NULL || r->saved_mark_at_top(); | |
| 5074 } | |
| 5075 return no_allocs; | |
| 5076 } | |
| 5077 | |
| 545 | 5078 void G1CollectedHeap::retire_all_alloc_regions() { |
| 342 | 5079 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
| 5080 HeapRegion* r = _gc_alloc_regions[ap]; | |
| 5081 if (r != NULL) { | |
| 5082 // Check for aliases. | |
| 5083 bool has_processed_alias = false; | |
| 5084 for (int i = 0; i < ap; ++i) { | |
| 5085 if (_gc_alloc_regions[i] == r) { | |
| 5086 has_processed_alias = true; | |
| 5087 break; | |
| 5088 } | |
| 5089 } | |
| 5090 if (!has_processed_alias) { | |
| 545 | 5091 retire_alloc_region(r, false /* par */); |
| 342 | 5092 } |
| 5093 } | |
| 5094 } | |
| 5095 } | |
| 5096 | |
| 5097 | |
| 5098 // Done at the start of full GC. | |
| 5099 void G1CollectedHeap::tear_down_region_lists() { | |
| 5100 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5101 while (pop_unclean_region_list_locked() != NULL) ; | |
| 5102 assert(_unclean_region_list.hd() == NULL && _unclean_region_list.sz() == 0, | |
|
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|
5103 "Postconditions of loop."); |
| 342 | 5104 while (pop_free_region_list_locked() != NULL) ; |
| 5105 assert(_free_region_list == NULL, "Postcondition of loop."); | |
| 5106 if (_free_region_list_size != 0) { | |
| 5107 gclog_or_tty->print_cr("Size is %d.", _free_region_list_size); | |
|
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
5108 print_on(gclog_or_tty, true /* extended */); |
| 342 | 5109 } |
| 5110 assert(_free_region_list_size == 0, "Postconditions of loop."); | |
| 5111 } | |
| 5112 | |
| 5113 | |
| 5114 class RegionResetter: public HeapRegionClosure { | |
| 5115 G1CollectedHeap* _g1; | |
| 5116 int _n; | |
| 5117 public: | |
| 5118 RegionResetter() : _g1(G1CollectedHeap::heap()), _n(0) {} | |
| 5119 bool doHeapRegion(HeapRegion* r) { | |
| 5120 if (r->continuesHumongous()) return false; | |
| 5121 if (r->top() > r->bottom()) { | |
| 5122 if (r->top() < r->end()) { | |
| 5123 Copy::fill_to_words(r->top(), | |
| 5124 pointer_delta(r->end(), r->top())); | |
| 5125 } | |
| 5126 r->set_zero_fill_allocated(); | |
| 5127 } else { | |
| 5128 assert(r->is_empty(), "tautology"); | |
| 677 | 5129 _n++; |
| 5130 switch (r->zero_fill_state()) { | |
| 342 | 5131 case HeapRegion::NotZeroFilled: |
| 5132 case HeapRegion::ZeroFilling: | |
| 5133 _g1->put_region_on_unclean_list_locked(r); | |
| 5134 break; | |
| 5135 case HeapRegion::Allocated: | |
| 5136 r->set_zero_fill_complete(); | |
| 5137 // no break; go on to put on free list. | |
| 5138 case HeapRegion::ZeroFilled: | |
| 5139 _g1->put_free_region_on_list_locked(r); | |
| 5140 break; | |
| 5141 } | |
| 5142 } | |
| 5143 return false; | |
| 5144 } | |
| 5145 | |
| 5146 int getFreeRegionCount() {return _n;} | |
| 5147 }; | |
| 5148 | |
| 5149 // Done at the end of full GC. | |
| 5150 void G1CollectedHeap::rebuild_region_lists() { | |
| 5151 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5152 // This needs to go at the end of the full GC. | |
| 5153 RegionResetter rs; | |
| 5154 heap_region_iterate(&rs); | |
| 5155 _free_regions = rs.getFreeRegionCount(); | |
| 5156 // Tell the ZF thread it may have work to do. | |
| 5157 if (should_zf()) ZF_mon->notify_all(); | |
| 5158 } | |
| 5159 | |
| 5160 class UsedRegionsNeedZeroFillSetter: public HeapRegionClosure { | |
| 5161 G1CollectedHeap* _g1; | |
| 5162 int _n; | |
| 5163 public: | |
| 5164 UsedRegionsNeedZeroFillSetter() : _g1(G1CollectedHeap::heap()), _n(0) {} | |
| 5165 bool doHeapRegion(HeapRegion* r) { | |
| 5166 if (r->continuesHumongous()) return false; | |
| 5167 if (r->top() > r->bottom()) { | |
| 5168 // There are assertions in "set_zero_fill_needed()" below that | |
| 5169 // require top() == bottom(), so this is technically illegal. | |
| 5170 // We'll skirt the law here, by making that true temporarily. | |
| 5171 DEBUG_ONLY(HeapWord* save_top = r->top(); | |
| 5172 r->set_top(r->bottom())); | |
| 5173 r->set_zero_fill_needed(); | |
| 5174 DEBUG_ONLY(r->set_top(save_top)); | |
| 5175 } | |
| 5176 return false; | |
| 5177 } | |
| 5178 }; | |
| 5179 | |
| 5180 // Done at the start of full GC. | |
| 5181 void G1CollectedHeap::set_used_regions_to_need_zero_fill() { | |
| 5182 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 5183 // This needs to go at the end of the full GC. | |
| 5184 UsedRegionsNeedZeroFillSetter rs; | |
| 5185 heap_region_iterate(&rs); | |
| 5186 } | |
| 5187 | |
| 5188 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
| 5189 _refine_cte_cl->set_concurrent(concurrent); | |
| 5190 } | |
| 5191 | |
| 5192 #ifndef PRODUCT | |
| 5193 | |
| 5194 class PrintHeapRegionClosure: public HeapRegionClosure { | |
| 5195 public: | |
| 5196 bool doHeapRegion(HeapRegion *r) { | |
| 5197 gclog_or_tty->print("Region: "PTR_FORMAT":", r); | |
| 5198 if (r != NULL) { | |
| 5199 if (r->is_on_free_list()) | |
| 5200 gclog_or_tty->print("Free "); | |
| 5201 if (r->is_young()) | |
| 5202 gclog_or_tty->print("Young "); | |
| 5203 if (r->isHumongous()) | |
| 5204 gclog_or_tty->print("Is Humongous "); | |
| 5205 r->print(); | |
| 5206 } | |
| 5207 return false; | |
| 5208 } | |
| 5209 }; | |
| 5210 | |
| 5211 class SortHeapRegionClosure : public HeapRegionClosure { | |
| 5212 size_t young_regions,free_regions, unclean_regions; | |
| 5213 size_t hum_regions, count; | |
| 5214 size_t unaccounted, cur_unclean, cur_alloc; | |
| 5215 size_t total_free; | |
| 5216 HeapRegion* cur; | |
| 5217 public: | |
| 5218 SortHeapRegionClosure(HeapRegion *_cur) : cur(_cur), young_regions(0), | |
| 5219 free_regions(0), unclean_regions(0), | |
| 5220 hum_regions(0), | |
| 5221 count(0), unaccounted(0), | |
| 5222 cur_alloc(0), total_free(0) | |
| 5223 {} | |
| 5224 bool doHeapRegion(HeapRegion *r) { | |
| 5225 count++; | |
| 5226 if (r->is_on_free_list()) free_regions++; | |
| 5227 else if (r->is_on_unclean_list()) unclean_regions++; | |
| 5228 else if (r->isHumongous()) hum_regions++; | |
| 5229 else if (r->is_young()) young_regions++; | |
| 5230 else if (r == cur) cur_alloc++; | |
| 5231 else unaccounted++; | |
| 5232 return false; | |
| 5233 } | |
| 5234 void print() { | |
| 5235 total_free = free_regions + unclean_regions; | |
| 5236 gclog_or_tty->print("%d regions\n", count); | |
| 5237 gclog_or_tty->print("%d free: free_list = %d unclean = %d\n", | |
| 5238 total_free, free_regions, unclean_regions); | |
| 5239 gclog_or_tty->print("%d humongous %d young\n", | |
| 5240 hum_regions, young_regions); | |
| 5241 gclog_or_tty->print("%d cur_alloc\n", cur_alloc); | |
| 5242 gclog_or_tty->print("UHOH unaccounted = %d\n", unaccounted); | |
| 5243 } | |
| 5244 }; | |
| 5245 | |
| 5246 void G1CollectedHeap::print_region_counts() { | |
| 5247 SortHeapRegionClosure sc(_cur_alloc_region); | |
| 5248 PrintHeapRegionClosure cl; | |
| 5249 heap_region_iterate(&cl); | |
| 5250 heap_region_iterate(&sc); | |
| 5251 sc.print(); | |
| 5252 print_region_accounting_info(); | |
| 5253 }; | |
| 5254 | |
| 5255 bool G1CollectedHeap::regions_accounted_for() { | |
| 5256 // TODO: regions accounting for young/survivor/tenured | |
| 5257 return true; | |
| 5258 } | |
| 5259 | |
| 5260 bool G1CollectedHeap::print_region_accounting_info() { | |
| 5261 gclog_or_tty->print_cr("Free regions: %d (count: %d count list %d) (clean: %d unclean: %d).", | |
| 5262 free_regions(), | |
| 5263 count_free_regions(), count_free_regions_list(), | |
| 5264 _free_region_list_size, _unclean_region_list.sz()); | |
| 5265 gclog_or_tty->print_cr("cur_alloc: %d.", | |
| 5266 (_cur_alloc_region == NULL ? 0 : 1)); | |
| 5267 gclog_or_tty->print_cr("H regions: %d.", _num_humongous_regions); | |
| 5268 | |
| 5269 // TODO: check regions accounting for young/survivor/tenured | |
| 5270 return true; | |
| 5271 } | |
| 5272 | |
| 5273 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
| 5274 HeapRegion* hr = heap_region_containing(p); | |
| 5275 if (hr == NULL) { | |
| 5276 return is_in_permanent(p); | |
| 5277 } else { | |
| 5278 return hr->is_in(p); | |
| 5279 } | |
| 5280 } | |
| 941 | 5281 #endif // !PRODUCT |
| 342 | 5282 |
| 5283 void G1CollectedHeap::g1_unimplemented() { | |
| 5284 // Unimplemented(); | |
| 5285 } |