Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 1763:d6f45b55c972
4809552: Optimize Arrays.fill(...)
Reviewed-by: kvn
author | never |
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date | Fri, 27 Aug 2010 17:33:49 -0700 |
parents | b63010841f78 |
children | 8e5955ddf8e4 |
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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 { | |
354
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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) { | |
1666
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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 | |
626
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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) { |
1359
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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 | |
838
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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); | |
838
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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(); | |
1394
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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 | |
1387
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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 | |
1089
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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 | |
626
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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. | |
1656
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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 if (ParallelGCThreads > 0) { |
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965 ParRebuildRSTask rebuild_rs_task(this); |
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966 assert(check_heap_region_claim_values( |
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967 HeapRegion::InitialClaimValue), "sanity check"); |
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968 set_par_threads(workers()->total_workers()); |
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969 workers()->run_task(&rebuild_rs_task); |
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970 set_par_threads(0); |
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971 assert(check_heap_region_claim_values( |
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972 HeapRegion::RebuildRSClaimValue), "sanity check"); |
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973 reset_heap_region_claim_values(); |
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974 } else { |
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975 RebuildRSOutOfRegionClosure rebuild_rs(this); |
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976 heap_region_iterate(&rebuild_rs); |
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977 } |
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978 |
342 | 979 if (PrintGC) { |
980 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); | |
981 } | |
982 | |
983 if (true) { // FIXME | |
984 // Ask the permanent generation to adjust size for full collections | |
985 perm()->compute_new_size(); | |
986 } | |
987 | |
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988 // Start a new incremental collection set for the next pause |
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989 assert(g1_policy()->collection_set() == NULL, "must be"); |
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990 g1_policy()->start_incremental_cset_building(); |
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991 |
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992 // Clear the _cset_fast_test bitmap in anticipation of adding |
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993 // regions to the incremental collection set for the next |
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994 // evacuation pause. |
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995 clear_cset_fast_test(); |
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996 |
342 | 997 double end = os::elapsedTime(); |
998 g1_policy()->record_full_collection_end(); | |
999 | |
546
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1000 #ifdef TRACESPINNING |
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1001 ParallelTaskTerminator::print_termination_counts(); |
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1002 #endif |
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1003 |
342 | 1004 gc_epilogue(true); |
1005 | |
794 | 1006 // Discard all rset updates |
1007 JavaThread::dirty_card_queue_set().abandon_logs(); | |
616
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1008 assert(!G1DeferredRSUpdate |
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1009 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
342 | 1010 assert(regions_accounted_for(), "Region leakage!"); |
1011 } | |
1012 | |
1013 if (g1_policy()->in_young_gc_mode()) { | |
1014 _young_list->reset_sampled_info(); | |
1394
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1015 // At this point there should be no regions in the |
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1016 // entire heap tagged as young. |
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1017 assert( check_young_list_empty(true /* check_heap */), |
342 | 1018 "young list should be empty at this point"); |
1019 } | |
838
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1020 |
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1021 // Update the number of full collections that have been completed. |
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1022 increment_full_collections_completed(false /* outer */); |
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1023 |
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1024 if (PrintHeapAtGC) { |
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1025 Universe::print_heap_after_gc(); |
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1026 } |
342 | 1027 } |
1028 | |
1029 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
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1030 do_collection(true, /* explicit_gc */ |
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1031 clear_all_soft_refs, |
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1032 0 /* word_size */); |
342 | 1033 } |
1034 | |
1035 // This code is mostly copied from TenuredGeneration. | |
1036 void | |
1037 G1CollectedHeap:: | |
1038 resize_if_necessary_after_full_collection(size_t word_size) { | |
1039 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
1040 | |
1041 // Include the current allocation, if any, and bytes that will be | |
1042 // pre-allocated to support collections, as "used". | |
1043 const size_t used_after_gc = used(); | |
1044 const size_t capacity_after_gc = capacity(); | |
1045 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
1046 | |
1717
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1047 // This is enforced in arguments.cpp. |
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1048 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, |
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1049 "otherwise the code below doesn't make sense"); |
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1050 |
342 | 1051 // We don't have floating point command-line arguments |
1717
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1052 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100.0; |
342 | 1053 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
1717
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1054 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100.0; |
342 | 1055 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
1056 | |
1717
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1057 const size_t min_heap_size = collector_policy()->min_heap_byte_size(); |
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1058 const size_t max_heap_size = collector_policy()->max_heap_byte_size(); |
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1059 |
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1060 // We have to be careful here as these two calculations can overflow |
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1061 // 32-bit size_t's. |
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1062 double used_after_gc_d = (double) used_after_gc; |
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1063 double minimum_desired_capacity_d = used_after_gc_d / maximum_used_percentage; |
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1064 double maximum_desired_capacity_d = used_after_gc_d / minimum_used_percentage; |
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1065 |
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1066 // Let's make sure that they are both under the max heap size, which |
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1067 // by default will make them fit into a size_t. |
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1068 double desired_capacity_upper_bound = (double) max_heap_size; |
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1069 minimum_desired_capacity_d = MIN2(minimum_desired_capacity_d, |
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1070 desired_capacity_upper_bound); |
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1071 maximum_desired_capacity_d = MIN2(maximum_desired_capacity_d, |
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1072 desired_capacity_upper_bound); |
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1073 |
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1074 // We can now safely turn them into size_t's. |
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1075 size_t minimum_desired_capacity = (size_t) minimum_desired_capacity_d; |
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1076 size_t maximum_desired_capacity = (size_t) maximum_desired_capacity_d; |
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1077 |
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1078 // This assert only makes sense here, before we adjust them |
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1079 // with respect to the min and max heap size. |
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1080 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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1081 err_msg("minimum_desired_capacity = "SIZE_FORMAT", " |
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1082 "maximum_desired_capacity = "SIZE_FORMAT, |
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1083 minimum_desired_capacity, maximum_desired_capacity)); |
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1084 |
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1085 // Should not be greater than the heap max size. No need to adjust |
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1086 // it with respect to the heap min size as it's a lower bound (i.e., |
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1087 // we'll try to make the capacity larger than it, not smaller). |
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1088 minimum_desired_capacity = MIN2(minimum_desired_capacity, max_heap_size); |
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1089 // Should not be less than the heap min size. No need to adjust it |
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1090 // with respect to the heap max size as it's an upper bound (i.e., |
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1091 // we'll try to make the capacity smaller than it, not greater). |
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1092 maximum_desired_capacity = MAX2(maximum_desired_capacity, min_heap_size); |
342 | 1093 |
1094 if (PrintGC && Verbose) { | |
1717
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1095 const double free_percentage = |
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1096 (double) free_after_gc / (double) capacity_after_gc; |
342 | 1097 gclog_or_tty->print_cr("Computing new size after full GC "); |
1098 gclog_or_tty->print_cr(" " | |
1099 " minimum_free_percentage: %6.2f", | |
1100 minimum_free_percentage); | |
1101 gclog_or_tty->print_cr(" " | |
1102 " maximum_free_percentage: %6.2f", | |
1103 maximum_free_percentage); | |
1104 gclog_or_tty->print_cr(" " | |
1105 " capacity: %6.1fK" | |
1106 " minimum_desired_capacity: %6.1fK" | |
1107 " maximum_desired_capacity: %6.1fK", | |
1717
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1108 (double) capacity_after_gc / (double) K, |
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1109 (double) minimum_desired_capacity / (double) K, |
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1110 (double) maximum_desired_capacity / (double) K); |
342 | 1111 gclog_or_tty->print_cr(" " |
1717
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1112 " free_after_gc: %6.1fK" |
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1113 " used_after_gc: %6.1fK", |
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1114 (double) free_after_gc / (double) K, |
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1115 (double) used_after_gc / (double) K); |
342 | 1116 gclog_or_tty->print_cr(" " |
1117 " free_percentage: %6.2f", | |
1118 free_percentage); | |
1119 } | |
1717
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1120 if (capacity_after_gc < minimum_desired_capacity) { |
342 | 1121 // Don't expand unless it's significant |
1122 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
1123 expand(expand_bytes); | |
1124 if (PrintGC && Verbose) { | |
1717
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1125 gclog_or_tty->print_cr(" " |
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1126 " expanding:" |
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1127 " max_heap_size: %6.1fK" |
342 | 1128 " minimum_desired_capacity: %6.1fK" |
1129 " expand_bytes: %6.1fK", | |
1717
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1130 (double) max_heap_size / (double) K, |
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1131 (double) minimum_desired_capacity / (double) K, |
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1132 (double) expand_bytes / (double) K); |
342 | 1133 } |
1134 | |
1135 // No expansion, now see if we want to shrink | |
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1136 } else if (capacity_after_gc > maximum_desired_capacity) { |
342 | 1137 // Capacity too large, compute shrinking size |
1138 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
1139 shrink(shrink_bytes); | |
1140 if (PrintGC && Verbose) { | |
1141 gclog_or_tty->print_cr(" " | |
1142 " shrinking:" | |
1717
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1143 " min_heap_size: %6.1fK" |
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1144 " maximum_desired_capacity: %6.1fK" |
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1145 " shrink_bytes: %6.1fK", |
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1146 (double) min_heap_size / (double) K, |
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1147 (double) maximum_desired_capacity / (double) K, |
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1148 (double) shrink_bytes / (double) K); |
342 | 1149 } |
1150 } | |
1151 } | |
1152 | |
1153 | |
1154 HeapWord* | |
1155 G1CollectedHeap::satisfy_failed_allocation(size_t word_size) { | |
1156 HeapWord* result = NULL; | |
1157 | |
1158 // In a G1 heap, we're supposed to keep allocation from failing by | |
1159 // incremental pauses. Therefore, at least for now, we'll favor | |
1160 // expansion over collection. (This might change in the future if we can | |
1161 // do something smarter than full collection to satisfy a failed alloc.) | |
1162 | |
1163 result = expand_and_allocate(word_size); | |
1164 if (result != NULL) { | |
1165 assert(is_in(result), "result not in heap"); | |
1166 return result; | |
1167 } | |
1168 | |
1169 // OK, I guess we have to try collection. | |
1170 | |
1171 do_collection(false, false, word_size); | |
1172 | |
1173 result = attempt_allocation(word_size, /*permit_collection_pause*/false); | |
1174 | |
1175 if (result != NULL) { | |
1176 assert(is_in(result), "result not in heap"); | |
1177 return result; | |
1178 } | |
1179 | |
1180 // Try collecting soft references. | |
1181 do_collection(false, true, word_size); | |
1182 result = attempt_allocation(word_size, /*permit_collection_pause*/false); | |
1183 if (result != NULL) { | |
1184 assert(is_in(result), "result not in heap"); | |
1185 return result; | |
1186 } | |
1187 | |
1387
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1188 assert(!collector_policy()->should_clear_all_soft_refs(), |
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1189 "Flag should have been handled and cleared prior to this point"); |
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1190 |
342 | 1191 // What else? We might try synchronous finalization later. If the total |
1192 // space available is large enough for the allocation, then a more | |
1193 // complete compaction phase than we've tried so far might be | |
1194 // appropriate. | |
1195 return NULL; | |
1196 } | |
1197 | |
1198 // Attempting to expand the heap sufficiently | |
1199 // to support an allocation of the given "word_size". If | |
1200 // successful, perform the allocation and return the address of the | |
1201 // allocated block, or else "NULL". | |
1202 | |
1203 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
1204 size_t expand_bytes = word_size * HeapWordSize; | |
1205 if (expand_bytes < MinHeapDeltaBytes) { | |
1206 expand_bytes = MinHeapDeltaBytes; | |
1207 } | |
1208 expand(expand_bytes); | |
1209 assert(regions_accounted_for(), "Region leakage!"); | |
1210 HeapWord* result = attempt_allocation(word_size, false /* permit_collection_pause */); | |
1211 return result; | |
1212 } | |
1213 | |
1214 size_t G1CollectedHeap::free_region_if_totally_empty(HeapRegion* hr) { | |
1215 size_t pre_used = 0; | |
1216 size_t cleared_h_regions = 0; | |
1217 size_t freed_regions = 0; | |
1218 UncleanRegionList local_list; | |
1219 free_region_if_totally_empty_work(hr, pre_used, cleared_h_regions, | |
1220 freed_regions, &local_list); | |
1221 | |
1222 finish_free_region_work(pre_used, cleared_h_regions, freed_regions, | |
1223 &local_list); | |
1224 return pre_used; | |
1225 } | |
1226 | |
1227 void | |
1228 G1CollectedHeap::free_region_if_totally_empty_work(HeapRegion* hr, | |
1229 size_t& pre_used, | |
1230 size_t& cleared_h, | |
1231 size_t& freed_regions, | |
1232 UncleanRegionList* list, | |
1233 bool par) { | |
1234 assert(!hr->continuesHumongous(), "should have filtered these out"); | |
1235 size_t res = 0; | |
677 | 1236 if (hr->used() > 0 && hr->garbage_bytes() == hr->used() && |
1237 !hr->is_young()) { | |
1238 if (G1PolicyVerbose > 0) | |
1239 gclog_or_tty->print_cr("Freeing empty region "PTR_FORMAT "(" SIZE_FORMAT " bytes)" | |
1240 " during cleanup", hr, hr->used()); | |
1241 free_region_work(hr, pre_used, cleared_h, freed_regions, list, par); | |
342 | 1242 } |
1243 } | |
1244 | |
1245 // FIXME: both this and shrink could probably be more efficient by | |
1246 // doing one "VirtualSpace::expand_by" call rather than several. | |
1247 void G1CollectedHeap::expand(size_t expand_bytes) { | |
1248 size_t old_mem_size = _g1_storage.committed_size(); | |
1249 // We expand by a minimum of 1K. | |
1250 expand_bytes = MAX2(expand_bytes, (size_t)K); | |
1251 size_t aligned_expand_bytes = | |
1252 ReservedSpace::page_align_size_up(expand_bytes); | |
1253 aligned_expand_bytes = align_size_up(aligned_expand_bytes, | |
1254 HeapRegion::GrainBytes); | |
1255 expand_bytes = aligned_expand_bytes; | |
1256 while (expand_bytes > 0) { | |
1257 HeapWord* base = (HeapWord*)_g1_storage.high(); | |
1258 // Commit more storage. | |
1259 bool successful = _g1_storage.expand_by(HeapRegion::GrainBytes); | |
1260 if (!successful) { | |
1261 expand_bytes = 0; | |
1262 } else { | |
1263 expand_bytes -= HeapRegion::GrainBytes; | |
1264 // Expand the committed region. | |
1265 HeapWord* high = (HeapWord*) _g1_storage.high(); | |
1266 _g1_committed.set_end(high); | |
1267 // Create a new HeapRegion. | |
1268 MemRegion mr(base, high); | |
1269 bool is_zeroed = !_g1_max_committed.contains(base); | |
1270 HeapRegion* hr = new HeapRegion(_bot_shared, mr, is_zeroed); | |
1271 | |
1272 // Now update max_committed if necessary. | |
1273 _g1_max_committed.set_end(MAX2(_g1_max_committed.end(), high)); | |
1274 | |
1275 // Add it to the HeapRegionSeq. | |
1276 _hrs->insert(hr); | |
1277 // Set the zero-fill state, according to whether it's already | |
1278 // zeroed. | |
1279 { | |
1280 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
1281 if (is_zeroed) { | |
1282 hr->set_zero_fill_complete(); | |
1283 put_free_region_on_list_locked(hr); | |
1284 } else { | |
1285 hr->set_zero_fill_needed(); | |
1286 put_region_on_unclean_list_locked(hr); | |
1287 } | |
1288 } | |
1289 _free_regions++; | |
1290 // And we used up an expansion region to create it. | |
1291 _expansion_regions--; | |
1292 // Tell the cardtable about it. | |
1293 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
1294 // And the offset table as well. | |
1295 _bot_shared->resize(_g1_committed.word_size()); | |
1296 } | |
1297 } | |
1298 if (Verbose && PrintGC) { | |
1299 size_t new_mem_size = _g1_storage.committed_size(); | |
1300 gclog_or_tty->print_cr("Expanding garbage-first heap from %ldK by %ldK to %ldK", | |
1301 old_mem_size/K, aligned_expand_bytes/K, | |
1302 new_mem_size/K); | |
1303 } | |
1304 } | |
1305 | |
1306 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) | |
1307 { | |
1308 size_t old_mem_size = _g1_storage.committed_size(); | |
1309 size_t aligned_shrink_bytes = | |
1310 ReservedSpace::page_align_size_down(shrink_bytes); | |
1311 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
1312 HeapRegion::GrainBytes); | |
1313 size_t num_regions_deleted = 0; | |
1314 MemRegion mr = _hrs->shrink_by(aligned_shrink_bytes, num_regions_deleted); | |
1315 | |
1316 assert(mr.end() == (HeapWord*)_g1_storage.high(), "Bad shrink!"); | |
1317 if (mr.byte_size() > 0) | |
1318 _g1_storage.shrink_by(mr.byte_size()); | |
1319 assert(mr.start() == (HeapWord*)_g1_storage.high(), "Bad shrink!"); | |
1320 | |
1321 _g1_committed.set_end(mr.start()); | |
1322 _free_regions -= num_regions_deleted; | |
1323 _expansion_regions += num_regions_deleted; | |
1324 | |
1325 // Tell the cardtable about it. | |
1326 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
1327 | |
1328 // And the offset table as well. | |
1329 _bot_shared->resize(_g1_committed.word_size()); | |
1330 | |
1331 HeapRegionRemSet::shrink_heap(n_regions()); | |
1332 | |
1333 if (Verbose && PrintGC) { | |
1334 size_t new_mem_size = _g1_storage.committed_size(); | |
1335 gclog_or_tty->print_cr("Shrinking garbage-first heap from %ldK by %ldK to %ldK", | |
1336 old_mem_size/K, aligned_shrink_bytes/K, | |
1337 new_mem_size/K); | |
1338 } | |
1339 } | |
1340 | |
1341 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
636 | 1342 release_gc_alloc_regions(true /* totally */); |
342 | 1343 tear_down_region_lists(); // We will rebuild them in a moment. |
1344 shrink_helper(shrink_bytes); | |
1345 rebuild_region_lists(); | |
1346 } | |
1347 | |
1348 // Public methods. | |
1349 | |
1350 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
1351 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
1352 #endif // _MSC_VER | |
1353 | |
1354 | |
1355 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
1356 SharedHeap(policy_), | |
1357 _g1_policy(policy_), | |
1111 | 1358 _dirty_card_queue_set(false), |
1705 | 1359 _into_cset_dirty_card_queue_set(false), |
342 | 1360 _ref_processor(NULL), |
1361 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), | |
1362 _bot_shared(NULL), | |
1363 _par_alloc_during_gc_lock(Mutex::leaf, "par alloc during GC lock"), | |
1364 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
1365 _evac_failure_scan_stack(NULL) , | |
1366 _mark_in_progress(false), | |
1367 _cg1r(NULL), _czft(NULL), _summary_bytes_used(0), | |
1368 _cur_alloc_region(NULL), | |
1369 _refine_cte_cl(NULL), | |
1370 _free_region_list(NULL), _free_region_list_size(0), | |
1371 _free_regions(0), | |
1372 _full_collection(false), | |
1373 _unclean_region_list(), | |
1374 _unclean_regions_coming(false), | |
1375 _young_list(new YoungList(this)), | |
1376 _gc_time_stamp(0), | |
526 | 1377 _surviving_young_words(NULL), |
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1378 _full_collections_completed(0), |
526 | 1379 _in_cset_fast_test(NULL), |
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1380 _in_cset_fast_test_base(NULL), |
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1381 _dirty_cards_region_list(NULL) { |
342 | 1382 _g1h = this; // To catch bugs. |
1383 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
1384 vm_exit_during_initialization("Failed necessary allocation."); | |
1385 } | |
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1386 |
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1387 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1388 |
342 | 1389 int n_queues = MAX2((int)ParallelGCThreads, 1); |
1390 _task_queues = new RefToScanQueueSet(n_queues); | |
1391 | |
1392 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
1393 assert(n_rem_sets > 0, "Invariant."); | |
1394 | |
1395 HeapRegionRemSetIterator** iter_arr = | |
1396 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
1397 for (int i = 0; i < n_queues; i++) { | |
1398 iter_arr[i] = new HeapRegionRemSetIterator(); | |
1399 } | |
1400 _rem_set_iterator = iter_arr; | |
1401 | |
1402 for (int i = 0; i < n_queues; i++) { | |
1403 RefToScanQueue* q = new RefToScanQueue(); | |
1404 q->initialize(); | |
1405 _task_queues->register_queue(i, q); | |
1406 } | |
1407 | |
1408 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
636 | 1409 _gc_alloc_regions[ap] = NULL; |
1410 _gc_alloc_region_counts[ap] = 0; | |
1411 _retained_gc_alloc_regions[ap] = NULL; | |
1412 // by default, we do not retain a GC alloc region for each ap; | |
1413 // we'll override this, when appropriate, below | |
1414 _retain_gc_alloc_region[ap] = false; | |
1415 } | |
1416 | |
1417 // We will try to remember the last half-full tenured region we | |
1418 // allocated to at the end of a collection so that we can re-use it | |
1419 // during the next collection. | |
1420 _retain_gc_alloc_region[GCAllocForTenured] = true; | |
1421 | |
342 | 1422 guarantee(_task_queues != NULL, "task_queues allocation failure."); |
1423 } | |
1424 | |
1425 jint G1CollectedHeap::initialize() { | |
1166 | 1426 CollectedHeap::pre_initialize(); |
342 | 1427 os::enable_vtime(); |
1428 | |
1429 // Necessary to satisfy locking discipline assertions. | |
1430 | |
1431 MutexLocker x(Heap_lock); | |
1432 | |
1433 // While there are no constraints in the GC code that HeapWordSize | |
1434 // be any particular value, there are multiple other areas in the | |
1435 // system which believe this to be true (e.g. oop->object_size in some | |
1436 // cases incorrectly returns the size in wordSize units rather than | |
1437 // HeapWordSize). | |
1438 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
1439 | |
1440 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
1441 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
1442 | |
1443 // Ensure that the sizes are properly aligned. | |
1444 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
1445 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
1446 | |
1447 _cg1r = new ConcurrentG1Refine(); | |
1448 | |
1449 // Reserve the maximum. | |
1450 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
1451 // Includes the perm-gen. | |
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1452 |
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1453 const size_t total_reserved = max_byte_size + pgs->max_size(); |
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1454 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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1455 |
342 | 1456 ReservedSpace heap_rs(max_byte_size + pgs->max_size(), |
1457 HeapRegion::GrainBytes, | |
642
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1458 false /*ism*/, addr); |
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1459 |
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1460 if (UseCompressedOops) { |
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1461 if (addr != NULL && !heap_rs.is_reserved()) { |
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1462 // Failed to reserve at specified address - the requested memory |
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1463 // region is taken already, for example, by 'java' launcher. |
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1464 // Try again to reserver heap higher. |
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1465 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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1466 ReservedSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
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1467 false /*ism*/, addr); |
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1468 if (addr != NULL && !heap_rs0.is_reserved()) { |
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1469 // Failed to reserve at specified address again - give up. |
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1470 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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1471 assert(addr == NULL, ""); |
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1472 ReservedSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
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1473 false /*ism*/, addr); |
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1474 heap_rs = heap_rs1; |
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1475 } else { |
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1476 heap_rs = heap_rs0; |
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1477 } |
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1478 } |
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1479 } |
342 | 1480 |
1481 if (!heap_rs.is_reserved()) { | |
1482 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
1483 return JNI_ENOMEM; | |
1484 } | |
1485 | |
1486 // It is important to do this in a way such that concurrent readers can't | |
1487 // temporarily think somethings in the heap. (I've actually seen this | |
1488 // happen in asserts: DLD.) | |
1489 _reserved.set_word_size(0); | |
1490 _reserved.set_start((HeapWord*)heap_rs.base()); | |
1491 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
1492 | |
1493 _expansion_regions = max_byte_size/HeapRegion::GrainBytes; | |
1494 | |
1495 _num_humongous_regions = 0; | |
1496 | |
1497 // Create the gen rem set (and barrier set) for the entire reserved region. | |
1498 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
1499 set_barrier_set(rem_set()->bs()); | |
1500 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
1501 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
1502 } else { | |
1503 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
1504 return JNI_ENOMEM; | |
1505 } | |
1506 | |
1507 // Also create a G1 rem set. | |
1508 if (G1UseHRIntoRS) { | |
1509 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { | |
1510 _g1_rem_set = new HRInto_G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
1511 } else { | |
1512 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); | |
1513 return JNI_ENOMEM; | |
1514 } | |
1515 } else { | |
1516 _g1_rem_set = new StupidG1RemSet(this); | |
1517 } | |
1518 | |
1519 // Carve out the G1 part of the heap. | |
1520 | |
1521 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
1522 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
1523 g1_rs.size()/HeapWordSize); | |
1524 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
1525 | |
1526 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
1527 | |
1528 _g1_storage.initialize(g1_rs, 0); | |
1529 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
1530 _g1_max_committed = _g1_committed; | |
393 | 1531 _hrs = new HeapRegionSeq(_expansion_regions); |
342 | 1532 guarantee(_hrs != NULL, "Couldn't allocate HeapRegionSeq"); |
1533 guarantee(_cur_alloc_region == NULL, "from constructor"); | |
1534 | |
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1535 // 6843694 - ensure that the maximum region index can fit |
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1536 // in the remembered set structures. |
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1537 const size_t max_region_idx = ((size_t)1 << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
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1538 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
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1539 |
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1540 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
942
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1541 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
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1542 guarantee((size_t) HeapRegion::CardsPerRegion < max_cards_per_region, |
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1543 "too many cards per region"); |
807
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1544 |
342 | 1545 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
1546 heap_word_size(init_byte_size)); | |
1547 | |
1548 _g1h = this; | |
1549 | |
1394
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1550 _in_cset_fast_test_length = max_regions(); |
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1551 _in_cset_fast_test_base = NEW_C_HEAP_ARRAY(bool, _in_cset_fast_test_length); |
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1552 |
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1553 // We're biasing _in_cset_fast_test to avoid subtracting the |
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1554 // beginning of the heap every time we want to index; basically |
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1555 // it's the same with what we do with the card table. |
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1556 _in_cset_fast_test = _in_cset_fast_test_base - |
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1557 ((size_t) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
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1558 |
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1559 // Clear the _cset_fast_test bitmap in anticipation of adding |
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1560 // regions to the incremental collection set for the first |
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1561 // evacuation pause. |
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1562 clear_cset_fast_test(); |
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1563 |
342 | 1564 // Create the ConcurrentMark data structure and thread. |
1565 // (Must do this late, so that "max_regions" is defined.) | |
1566 _cm = new ConcurrentMark(heap_rs, (int) max_regions()); | |
1567 _cmThread = _cm->cmThread(); | |
1568 | |
1569 // ...and the concurrent zero-fill thread, if necessary. | |
1570 if (G1ConcZeroFill) { | |
1571 _czft = new ConcurrentZFThread(); | |
1572 } | |
1573 | |
1574 // Initialize the from_card cache structure of HeapRegionRemSet. | |
1575 HeapRegionRemSet::init_heap(max_regions()); | |
1576 | |
677 | 1577 // Now expand into the initial heap size. |
1578 expand(init_byte_size); | |
342 | 1579 |
1580 // Perform any initialization actions delegated to the policy. | |
1581 g1_policy()->init(); | |
1582 | |
1583 g1_policy()->note_start_of_mark_thread(); | |
1584 | |
1585 _refine_cte_cl = | |
1586 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
1587 g1_rem_set(), | |
1588 concurrent_g1_refine()); | |
1589 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
1590 | |
1591 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
1592 SATB_Q_FL_lock, | |
1111 | 1593 G1SATBProcessCompletedThreshold, |
342 | 1594 Shared_SATB_Q_lock); |
794 | 1595 |
1596 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
1597 DirtyCardQ_FL_lock, | |
1111 | 1598 concurrent_g1_refine()->yellow_zone(), |
1599 concurrent_g1_refine()->red_zone(), | |
794 | 1600 Shared_DirtyCardQ_lock); |
1601 | |
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
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1602 if (G1DeferredRSUpdate) { |
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1603 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
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1604 DirtyCardQ_FL_lock, |
1111 | 1605 -1, // never trigger processing |
1606 -1, // no limit on length | |
616
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1607 Shared_DirtyCardQ_lock, |
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1608 &JavaThread::dirty_card_queue_set()); |
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1609 } |
1705 | 1610 |
1611 // Initialize the card queue set used to hold cards containing | |
1612 // references into the collection set. | |
1613 _into_cset_dirty_card_queue_set.initialize(DirtyCardQ_CBL_mon, | |
1614 DirtyCardQ_FL_lock, | |
1615 -1, // never trigger processing | |
1616 -1, // no limit on length | |
1617 Shared_DirtyCardQ_lock, | |
1618 &JavaThread::dirty_card_queue_set()); | |
1619 | |
342 | 1620 // In case we're keeping closure specialization stats, initialize those |
1621 // counts and that mechanism. | |
1622 SpecializationStats::clear(); | |
1623 | |
1624 _gc_alloc_region_list = NULL; | |
1625 | |
1626 // Do later initialization work for concurrent refinement. | |
1627 _cg1r->init(); | |
1628 | |
1629 return JNI_OK; | |
1630 } | |
1631 | |
1632 void G1CollectedHeap::ref_processing_init() { | |
1633 SharedHeap::ref_processing_init(); | |
1634 MemRegion mr = reserved_region(); | |
1635 _ref_processor = ReferenceProcessor::create_ref_processor( | |
1636 mr, // span | |
1637 false, // Reference discovery is not atomic | |
1638 // (though it shouldn't matter here.) | |
1639 true, // mt_discovery | |
1640 NULL, // is alive closure: need to fill this in for efficiency | |
1641 ParallelGCThreads, | |
1642 ParallelRefProcEnabled, | |
1643 true); // Setting next fields of discovered | |
1644 // lists requires a barrier. | |
1645 } | |
1646 | |
1647 size_t G1CollectedHeap::capacity() const { | |
1648 return _g1_committed.byte_size(); | |
1649 } | |
1650 | |
1705 | 1651 void G1CollectedHeap::iterate_dirty_card_closure(CardTableEntryClosure* cl, |
1652 DirtyCardQueue* into_cset_dcq, | |
1653 bool concurrent, | |
342 | 1654 int worker_i) { |
889 | 1655 // Clean cards in the hot card cache |
1705 | 1656 concurrent_g1_refine()->clean_up_cache(worker_i, g1_rem_set(), into_cset_dcq); |
889 | 1657 |
342 | 1658 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
1659 int n_completed_buffers = 0; | |
1705 | 1660 while (dcqs.apply_closure_to_completed_buffer(cl, worker_i, 0, true)) { |
342 | 1661 n_completed_buffers++; |
1662 } | |
1663 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
1664 (double) n_completed_buffers); | |
1665 dcqs.clear_n_completed_buffers(); | |
1666 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
1667 } | |
1668 | |
1669 | |
1670 // Computes the sum of the storage used by the various regions. | |
1671 | |
1672 size_t G1CollectedHeap::used() const { | |
862
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1673 assert(Heap_lock->owner() != NULL, |
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1674 "Should be owned on this thread's behalf."); |
342 | 1675 size_t result = _summary_bytes_used; |
845
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1676 // Read only once in case it is set to NULL concurrently |
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1677 HeapRegion* hr = _cur_alloc_region; |
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1678 if (hr != NULL) |
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1679 result += hr->used(); |
342 | 1680 return result; |
1681 } | |
1682 | |
846
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1683 size_t G1CollectedHeap::used_unlocked() const { |
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1684 size_t result = _summary_bytes_used; |
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1685 return result; |
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1686 } |
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1687 |
342 | 1688 class SumUsedClosure: public HeapRegionClosure { |
1689 size_t _used; | |
1690 public: | |
1691 SumUsedClosure() : _used(0) {} | |
1692 bool doHeapRegion(HeapRegion* r) { | |
1693 if (!r->continuesHumongous()) { | |
1694 _used += r->used(); | |
1695 } | |
1696 return false; | |
1697 } | |
1698 size_t result() { return _used; } | |
1699 }; | |
1700 | |
1701 size_t G1CollectedHeap::recalculate_used() const { | |
1702 SumUsedClosure blk; | |
1703 _hrs->iterate(&blk); | |
1704 return blk.result(); | |
1705 } | |
1706 | |
1707 #ifndef PRODUCT | |
1708 class SumUsedRegionsClosure: public HeapRegionClosure { | |
1709 size_t _num; | |
1710 public: | |
677 | 1711 SumUsedRegionsClosure() : _num(0) {} |
342 | 1712 bool doHeapRegion(HeapRegion* r) { |
1713 if (r->continuesHumongous() || r->used() > 0 || r->is_gc_alloc_region()) { | |
1714 _num += 1; | |
1715 } | |
1716 return false; | |
1717 } | |
1718 size_t result() { return _num; } | |
1719 }; | |
1720 | |
1721 size_t G1CollectedHeap::recalculate_used_regions() const { | |
1722 SumUsedRegionsClosure blk; | |
1723 _hrs->iterate(&blk); | |
1724 return blk.result(); | |
1725 } | |
1726 #endif // PRODUCT | |
1727 | |
1728 size_t G1CollectedHeap::unsafe_max_alloc() { | |
1729 if (_free_regions > 0) return HeapRegion::GrainBytes; | |
1730 // otherwise, is there space in the current allocation region? | |
1731 | |
1732 // We need to store the current allocation region in a local variable | |
1733 // here. The problem is that this method doesn't take any locks and | |
1734 // there may be other threads which overwrite the current allocation | |
1735 // region field. attempt_allocation(), for example, sets it to NULL | |
1736 // and this can happen *after* the NULL check here but before the call | |
1737 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
1738 // to be a problem in the optimized build, since the two loads of the | |
1739 // current allocation region field are optimized away. | |
1740 HeapRegion* car = _cur_alloc_region; | |
1741 | |
1742 // FIXME: should iterate over all regions? | |
1743 if (car == NULL) { | |
1744 return 0; | |
1745 } | |
1746 return car->free(); | |
1747 } | |
1748 | |
1656
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1749 bool G1CollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { |
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1750 return |
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1751 ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
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1752 (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)); |
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1753 } |
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1754 |
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1755 void G1CollectedHeap::increment_full_collections_completed(bool outer) { |
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1756 MonitorLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
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1757 |
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1758 // We have already incremented _total_full_collections at the start |
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1759 // of the GC, so total_full_collections() represents how many full |
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1760 // collections have been started. |
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1761 unsigned int full_collections_started = total_full_collections(); |
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1762 |
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1763 // Given that this method is called at the end of a Full GC or of a |
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1764 // concurrent cycle, and those can be nested (i.e., a Full GC can |
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1765 // interrupt a concurrent cycle), the number of full collections |
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1766 // completed should be either one (in the case where there was no |
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1767 // nesting) or two (when a Full GC interrupted a concurrent cycle) |
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1768 // behind the number of full collections started. |
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1769 |
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1770 // This is the case for the inner caller, i.e. a Full GC. |
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1771 assert(outer || |
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1772 (full_collections_started == _full_collections_completed + 1) || |
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1773 (full_collections_started == _full_collections_completed + 2), |
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1774 err_msg("for inner caller: full_collections_started = %u " |
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1775 "is inconsistent with _full_collections_completed = %u", |
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1776 full_collections_started, _full_collections_completed)); |
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1777 |
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1778 // This is the case for the outer caller, i.e. the concurrent cycle. |
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1779 assert(!outer || |
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1780 (full_collections_started == _full_collections_completed + 1), |
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1781 err_msg("for outer caller: full_collections_started = %u " |
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1782 "is inconsistent with _full_collections_completed = %u", |
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1783 full_collections_started, _full_collections_completed)); |
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1784 |
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1785 _full_collections_completed += 1; |
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1786 |
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1787 // This notify_all() will ensure that a thread that called |
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1788 // System.gc() with (with ExplicitGCInvokesConcurrent set or not) |
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1789 // and it's waiting for a full GC to finish will be woken up. It is |
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1790 // waiting in VM_G1IncCollectionPause::doit_epilogue(). |
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1791 FullGCCount_lock->notify_all(); |
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1792 } |
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1793 |
342 | 1794 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { |
1795 assert(Thread::current()->is_VM_thread(), "Precondition#1"); | |
1796 assert(Heap_lock->is_locked(), "Precondition#2"); | |
1797 GCCauseSetter gcs(this, cause); | |
1798 switch (cause) { | |
1799 case GCCause::_heap_inspection: | |
1800 case GCCause::_heap_dump: { | |
1801 HandleMark hm; | |
1802 do_full_collection(false); // don't clear all soft refs | |
1803 break; | |
1804 } | |
1805 default: // XXX FIX ME | |
1806 ShouldNotReachHere(); // Unexpected use of this function | |
1807 } | |
1808 } | |
1809 | |
1088
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1810 void G1CollectedHeap::collect(GCCause::Cause cause) { |
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1811 // The caller doesn't have the Heap_lock |
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1812 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); |
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1813 |
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1814 unsigned int gc_count_before; |
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1815 unsigned int full_gc_count_before; |
342 | 1816 { |
1088
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1817 MutexLocker ml(Heap_lock); |
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1818 // Read the GC count while holding the Heap_lock |
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1819 gc_count_before = SharedHeap::heap()->total_collections(); |
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1820 full_gc_count_before = SharedHeap::heap()->total_full_collections(); |
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1821 |
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1822 // Don't want to do a GC until cleanup is completed. |
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1823 wait_for_cleanup_complete(); |
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1824 |
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1825 // We give up heap lock; VMThread::execute gets it back below |
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1826 } |
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1827 |
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1828 if (should_do_concurrent_full_gc(cause)) { |
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1829 // Schedule an initial-mark evacuation pause that will start a |
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1830 // concurrent cycle. |
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1831 VM_G1IncCollectionPause op(gc_count_before, |
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1832 true, /* should_initiate_conc_mark */ |
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1833 g1_policy()->max_pause_time_ms(), |
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1834 cause); |
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1835 VMThread::execute(&op); |
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1836 } else { |
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1837 if (cause == GCCause::_gc_locker |
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1838 DEBUG_ONLY(|| cause == GCCause::_scavenge_alot)) { |
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1839 |
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1840 // Schedule a standard evacuation pause. |
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1841 VM_G1IncCollectionPause op(gc_count_before, |
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1842 false, /* should_initiate_conc_mark */ |
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1843 g1_policy()->max_pause_time_ms(), |
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1844 cause); |
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1845 VMThread::execute(&op); |
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1846 } else { |
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1847 // Schedule a Full GC. |
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1848 VM_G1CollectFull op(gc_count_before, full_gc_count_before, cause); |
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1849 VMThread::execute(&op); |
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1850 } |
342 | 1851 } |
1852 } | |
1853 | |
1854 bool G1CollectedHeap::is_in(const void* p) const { | |
1855 if (_g1_committed.contains(p)) { | |
1856 HeapRegion* hr = _hrs->addr_to_region(p); | |
1857 return hr->is_in(p); | |
1858 } else { | |
1859 return _perm_gen->as_gen()->is_in(p); | |
1860 } | |
1861 } | |
1862 | |
1863 // Iteration functions. | |
1864 | |
1865 // Iterates an OopClosure over all ref-containing fields of objects | |
1866 // within a HeapRegion. | |
1867 | |
1868 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
1869 MemRegion _mr; | |
1870 OopClosure* _cl; | |
1871 public: | |
1872 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
1873 : _mr(mr), _cl(cl) {} | |
1874 bool doHeapRegion(HeapRegion* r) { | |
1875 if (! r->continuesHumongous()) { | |
1876 r->oop_iterate(_cl); | |
1877 } | |
1878 return false; | |
1879 } | |
1880 }; | |
1881 | |
678 | 1882 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
342 | 1883 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
1884 _hrs->iterate(&blk); | |
678 | 1885 if (do_perm) { |
1886 perm_gen()->oop_iterate(cl); | |
1887 } | |
342 | 1888 } |
1889 | |
678 | 1890 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
342 | 1891 IterateOopClosureRegionClosure blk(mr, cl); |
1892 _hrs->iterate(&blk); | |
678 | 1893 if (do_perm) { |
1894 perm_gen()->oop_iterate(cl); | |
1895 } | |
342 | 1896 } |
1897 | |
1898 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
1899 | |
1900 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
1901 ObjectClosure* _cl; | |
1902 public: | |
1903 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
1904 bool doHeapRegion(HeapRegion* r) { | |
1905 if (! r->continuesHumongous()) { | |
1906 r->object_iterate(_cl); | |
1907 } | |
1908 return false; | |
1909 } | |
1910 }; | |
1911 | |
678 | 1912 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
342 | 1913 IterateObjectClosureRegionClosure blk(cl); |
1914 _hrs->iterate(&blk); | |
678 | 1915 if (do_perm) { |
1916 perm_gen()->object_iterate(cl); | |
1917 } | |
342 | 1918 } |
1919 | |
1920 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
1921 // FIXME: is this right? | |
1922 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
1923 } | |
1924 | |
1925 // Calls a SpaceClosure on a HeapRegion. | |
1926 | |
1927 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
1928 SpaceClosure* _cl; | |
1929 public: | |
1930 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
1931 bool doHeapRegion(HeapRegion* r) { | |
1932 _cl->do_space(r); | |
1933 return false; | |
1934 } | |
1935 }; | |
1936 | |
1937 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
1938 SpaceClosureRegionClosure blk(cl); | |
1939 _hrs->iterate(&blk); | |
1940 } | |
1941 | |
1942 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) { | |
1943 _hrs->iterate(cl); | |
1944 } | |
1945 | |
1946 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
1947 HeapRegionClosure* cl) { | |
1948 _hrs->iterate_from(r, cl); | |
1949 } | |
1950 | |
1951 void | |
1952 G1CollectedHeap::heap_region_iterate_from(int idx, HeapRegionClosure* cl) { | |
1953 _hrs->iterate_from(idx, cl); | |
1954 } | |
1955 | |
1956 HeapRegion* G1CollectedHeap::region_at(size_t idx) { return _hrs->at(idx); } | |
1957 | |
1958 void | |
1959 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
1960 int worker, | |
1961 jint claim_value) { | |
355 | 1962 const size_t regions = n_regions(); |
1963 const size_t worker_num = (ParallelGCThreads > 0 ? ParallelGCThreads : 1); | |
1964 // try to spread out the starting points of the workers | |
1965 const size_t start_index = regions / worker_num * (size_t) worker; | |
1966 | |
1967 // each worker will actually look at all regions | |
1968 for (size_t count = 0; count < regions; ++count) { | |
1969 const size_t index = (start_index + count) % regions; | |
1970 assert(0 <= index && index < regions, "sanity"); | |
1971 HeapRegion* r = region_at(index); | |
1972 // we'll ignore "continues humongous" regions (we'll process them | |
1973 // when we come across their corresponding "start humongous" | |
1974 // region) and regions already claimed | |
1975 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
1976 continue; | |
1977 } | |
1978 // OK, try to claim it | |
342 | 1979 if (r->claimHeapRegion(claim_value)) { |
355 | 1980 // success! |
1981 assert(!r->continuesHumongous(), "sanity"); | |
1982 if (r->startsHumongous()) { | |
1983 // If the region is "starts humongous" we'll iterate over its | |
1984 // "continues humongous" first; in fact we'll do them | |
1985 // first. The order is important. In on case, calling the | |
1986 // closure on the "starts humongous" region might de-allocate | |
1987 // and clear all its "continues humongous" regions and, as a | |
1988 // result, we might end up processing them twice. So, we'll do | |
1989 // them first (notice: most closures will ignore them anyway) and | |
1990 // then we'll do the "starts humongous" region. | |
1991 for (size_t ch_index = index + 1; ch_index < regions; ++ch_index) { | |
1992 HeapRegion* chr = region_at(ch_index); | |
1993 | |
1994 // if the region has already been claimed or it's not | |
1995 // "continues humongous" we're done | |
1996 if (chr->claim_value() == claim_value || | |
1997 !chr->continuesHumongous()) { | |
1998 break; | |
1999 } | |
2000 | |
2001 // Noone should have claimed it directly. We can given | |
2002 // that we claimed its "starts humongous" region. | |
2003 assert(chr->claim_value() != claim_value, "sanity"); | |
2004 assert(chr->humongous_start_region() == r, "sanity"); | |
2005 | |
2006 if (chr->claimHeapRegion(claim_value)) { | |
2007 // we should always be able to claim it; noone else should | |
2008 // be trying to claim this region | |
2009 | |
2010 bool res2 = cl->doHeapRegion(chr); | |
2011 assert(!res2, "Should not abort"); | |
2012 | |
2013 // Right now, this holds (i.e., no closure that actually | |
2014 // does something with "continues humongous" regions | |
2015 // clears them). We might have to weaken it in the future, | |
2016 // but let's leave these two asserts here for extra safety. | |
2017 assert(chr->continuesHumongous(), "should still be the case"); | |
2018 assert(chr->humongous_start_region() == r, "sanity"); | |
2019 } else { | |
2020 guarantee(false, "we should not reach here"); | |
2021 } | |
2022 } | |
2023 } | |
2024 | |
2025 assert(!r->continuesHumongous(), "sanity"); | |
2026 bool res = cl->doHeapRegion(r); | |
2027 assert(!res, "Should not abort"); | |
2028 } | |
2029 } | |
2030 } | |
2031 | |
390 | 2032 class ResetClaimValuesClosure: public HeapRegionClosure { |
2033 public: | |
2034 bool doHeapRegion(HeapRegion* r) { | |
2035 r->set_claim_value(HeapRegion::InitialClaimValue); | |
2036 return false; | |
2037 } | |
2038 }; | |
2039 | |
2040 void | |
2041 G1CollectedHeap::reset_heap_region_claim_values() { | |
2042 ResetClaimValuesClosure blk; | |
2043 heap_region_iterate(&blk); | |
2044 } | |
2045 | |
355 | 2046 #ifdef ASSERT |
2047 // This checks whether all regions in the heap have the correct claim | |
2048 // value. I also piggy-backed on this a check to ensure that the | |
2049 // humongous_start_region() information on "continues humongous" | |
2050 // regions is correct. | |
2051 | |
2052 class CheckClaimValuesClosure : public HeapRegionClosure { | |
2053 private: | |
2054 jint _claim_value; | |
2055 size_t _failures; | |
2056 HeapRegion* _sh_region; | |
2057 public: | |
2058 CheckClaimValuesClosure(jint claim_value) : | |
2059 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
2060 bool doHeapRegion(HeapRegion* r) { | |
2061 if (r->claim_value() != _claim_value) { | |
2062 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
2063 "claim value = %d, should be %d", | |
2064 r->bottom(), r->end(), r->claim_value(), | |
2065 _claim_value); | |
2066 ++_failures; | |
2067 } | |
2068 if (!r->isHumongous()) { | |
2069 _sh_region = NULL; | |
2070 } else if (r->startsHumongous()) { | |
2071 _sh_region = r; | |
2072 } else if (r->continuesHumongous()) { | |
2073 if (r->humongous_start_region() != _sh_region) { | |
2074 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
2075 "HS = "PTR_FORMAT", should be "PTR_FORMAT, | |
2076 r->bottom(), r->end(), | |
2077 r->humongous_start_region(), | |
2078 _sh_region); | |
2079 ++_failures; | |
342 | 2080 } |
2081 } | |
355 | 2082 return false; |
2083 } | |
2084 size_t failures() { | |
2085 return _failures; | |
2086 } | |
2087 }; | |
2088 | |
2089 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
2090 CheckClaimValuesClosure cl(claim_value); | |
2091 heap_region_iterate(&cl); | |
2092 return cl.failures() == 0; | |
2093 } | |
2094 #endif // ASSERT | |
342 | 2095 |
2096 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { | |
2097 HeapRegion* r = g1_policy()->collection_set(); | |
2098 while (r != NULL) { | |
2099 HeapRegion* next = r->next_in_collection_set(); | |
2100 if (cl->doHeapRegion(r)) { | |
2101 cl->incomplete(); | |
2102 return; | |
2103 } | |
2104 r = next; | |
2105 } | |
2106 } | |
2107 | |
2108 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
2109 HeapRegionClosure *cl) { | |
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2110 if (r == NULL) { |
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2111 // The CSet is empty so there's nothing to do. |
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2112 return; |
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2113 } |
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2114 |
342 | 2115 assert(r->in_collection_set(), |
2116 "Start region must be a member of the collection set."); | |
2117 HeapRegion* cur = r; | |
2118 while (cur != NULL) { | |
2119 HeapRegion* next = cur->next_in_collection_set(); | |
2120 if (cl->doHeapRegion(cur) && false) { | |
2121 cl->incomplete(); | |
2122 return; | |
2123 } | |
2124 cur = next; | |
2125 } | |
2126 cur = g1_policy()->collection_set(); | |
2127 while (cur != r) { | |
2128 HeapRegion* next = cur->next_in_collection_set(); | |
2129 if (cl->doHeapRegion(cur) && false) { | |
2130 cl->incomplete(); | |
2131 return; | |
2132 } | |
2133 cur = next; | |
2134 } | |
2135 } | |
2136 | |
2137 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
2138 return _hrs->length() > 0 ? _hrs->at(0) : NULL; | |
2139 } | |
2140 | |
2141 | |
2142 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
2143 Space* res = heap_region_containing(addr); | |
2144 if (res == NULL) | |
2145 res = perm_gen()->space_containing(addr); | |
2146 return res; | |
2147 } | |
2148 | |
2149 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
2150 Space* sp = space_containing(addr); | |
2151 if (sp != NULL) { | |
2152 return sp->block_start(addr); | |
2153 } | |
2154 return NULL; | |
2155 } | |
2156 | |
2157 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
2158 Space* sp = space_containing(addr); | |
2159 assert(sp != NULL, "block_size of address outside of heap"); | |
2160 return sp->block_size(addr); | |
2161 } | |
2162 | |
2163 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
2164 Space* sp = space_containing(addr); | |
2165 return sp->block_is_obj(addr); | |
2166 } | |
2167 | |
2168 bool G1CollectedHeap::supports_tlab_allocation() const { | |
2169 return true; | |
2170 } | |
2171 | |
2172 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
2173 return HeapRegion::GrainBytes; | |
2174 } | |
2175 | |
2176 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
2177 // Return the remaining space in the cur alloc region, but not less than | |
2178 // the min TLAB size. | |
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2179 |
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2180 // Also, this value can be at most the humongous object threshold, |
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2181 // since we can't allow tlabs to grow big enough to accomodate |
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2182 // humongous objects. |
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2183 |
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2184 // We need to store the cur alloc region locally, since it might change |
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2185 // between when we test for NULL and when we use it later. |
342 | 2186 ContiguousSpace* cur_alloc_space = _cur_alloc_region; |
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2187 size_t max_tlab_size = _humongous_object_threshold_in_words * wordSize; |
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2188 |
342 | 2189 if (cur_alloc_space == NULL) { |
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2190 return max_tlab_size; |
342 | 2191 } else { |
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2192 return MIN2(MAX2(cur_alloc_space->free(), (size_t)MinTLABSize), |
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2193 max_tlab_size); |
342 | 2194 } |
2195 } | |
2196 | |
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2197 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t word_size) { |
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2198 assert(!isHumongous(word_size), |
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2199 err_msg("a TLAB should not be of humongous size, " |
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2200 "word_size = "SIZE_FORMAT, word_size)); |
342 | 2201 bool dummy; |
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2202 return G1CollectedHeap::mem_allocate(word_size, false, true, &dummy); |
342 | 2203 } |
2204 | |
2205 bool G1CollectedHeap::allocs_are_zero_filled() { | |
2206 return false; | |
2207 } | |
2208 | |
2209 size_t G1CollectedHeap::large_typearray_limit() { | |
2210 // FIXME | |
2211 return HeapRegion::GrainBytes/HeapWordSize; | |
2212 } | |
2213 | |
2214 size_t G1CollectedHeap::max_capacity() const { | |
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2215 return g1_reserved_obj_bytes(); |
342 | 2216 } |
2217 | |
2218 jlong G1CollectedHeap::millis_since_last_gc() { | |
2219 // assert(false, "NYI"); | |
2220 return 0; | |
2221 } | |
2222 | |
2223 | |
2224 void G1CollectedHeap::prepare_for_verify() { | |
2225 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
2226 ensure_parsability(false); | |
2227 } | |
2228 g1_rem_set()->prepare_for_verify(); | |
2229 } | |
2230 | |
2231 class VerifyLivenessOopClosure: public OopClosure { | |
2232 G1CollectedHeap* g1h; | |
2233 public: | |
2234 VerifyLivenessOopClosure(G1CollectedHeap* _g1h) { | |
2235 g1h = _g1h; | |
2236 } | |
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2237 void do_oop(narrowOop *p) { do_oop_work(p); } |
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2238 void do_oop( oop *p) { do_oop_work(p); } |
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2239 |
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2240 template <class T> void do_oop_work(T *p) { |
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2241 oop obj = oopDesc::load_decode_heap_oop(p); |
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2242 guarantee(obj == NULL || !g1h->is_obj_dead(obj), |
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2243 "Dead object referenced by a not dead object"); |
342 | 2244 } |
2245 }; | |
2246 | |
2247 class VerifyObjsInRegionClosure: public ObjectClosure { | |
811 | 2248 private: |
342 | 2249 G1CollectedHeap* _g1h; |
2250 size_t _live_bytes; | |
2251 HeapRegion *_hr; | |
811 | 2252 bool _use_prev_marking; |
342 | 2253 public: |
811 | 2254 // use_prev_marking == true -> use "prev" marking information, |
2255 // use_prev_marking == false -> use "next" marking information | |
2256 VerifyObjsInRegionClosure(HeapRegion *hr, bool use_prev_marking) | |
2257 : _live_bytes(0), _hr(hr), _use_prev_marking(use_prev_marking) { | |
342 | 2258 _g1h = G1CollectedHeap::heap(); |
2259 } | |
2260 void do_object(oop o) { | |
2261 VerifyLivenessOopClosure isLive(_g1h); | |
2262 assert(o != NULL, "Huh?"); | |
811 | 2263 if (!_g1h->is_obj_dead_cond(o, _use_prev_marking)) { |
342 | 2264 o->oop_iterate(&isLive); |
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2265 if (!_hr->obj_allocated_since_prev_marking(o)) { |
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2266 size_t obj_size = o->size(); // Make sure we don't overflow |
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2267 _live_bytes += (obj_size * HeapWordSize); |
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2268 } |
342 | 2269 } |
2270 } | |
2271 size_t live_bytes() { return _live_bytes; } | |
2272 }; | |
2273 | |
2274 class PrintObjsInRegionClosure : public ObjectClosure { | |
2275 HeapRegion *_hr; | |
2276 G1CollectedHeap *_g1; | |
2277 public: | |
2278 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
2279 _g1 = G1CollectedHeap::heap(); | |
2280 }; | |
2281 | |
2282 void do_object(oop o) { | |
2283 if (o != NULL) { | |
2284 HeapWord *start = (HeapWord *) o; | |
2285 size_t word_sz = o->size(); | |
2286 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
2287 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
2288 (void*) o, word_sz, | |
2289 _g1->isMarkedPrev(o), | |
2290 _g1->isMarkedNext(o), | |
2291 _hr->obj_allocated_since_prev_marking(o)); | |
2292 HeapWord *end = start + word_sz; | |
2293 HeapWord *cur; | |
2294 int *val; | |
2295 for (cur = start; cur < end; cur++) { | |
2296 val = (int *) cur; | |
2297 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
2298 } | |
2299 } | |
2300 } | |
2301 }; | |
2302 | |
2303 class VerifyRegionClosure: public HeapRegionClosure { | |
811 | 2304 private: |
342 | 2305 bool _allow_dirty; |
390 | 2306 bool _par; |
811 | 2307 bool _use_prev_marking; |
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2308 bool _failures; |
811 | 2309 public: |
2310 // use_prev_marking == true -> use "prev" marking information, | |
2311 // use_prev_marking == false -> use "next" marking information | |
2312 VerifyRegionClosure(bool allow_dirty, bool par, bool use_prev_marking) | |
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2313 : _allow_dirty(allow_dirty), |
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2314 _par(par), |
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2315 _use_prev_marking(use_prev_marking), |
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2316 _failures(false) {} |
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2317 |
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2318 bool failures() { |
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2319 return _failures; |
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2320 } |
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2321 |
342 | 2322 bool doHeapRegion(HeapRegion* r) { |
390 | 2323 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
2324 "Should be unclaimed at verify points."); | |
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2325 if (!r->continuesHumongous()) { |
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2326 bool failures = false; |
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2327 r->verify(_allow_dirty, _use_prev_marking, &failures); |
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2328 if (failures) { |
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2329 _failures = true; |
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2330 } else { |
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2331 VerifyObjsInRegionClosure not_dead_yet_cl(r, _use_prev_marking); |
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2332 r->object_iterate(¬_dead_yet_cl); |
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2333 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) { |
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2334 gclog_or_tty->print_cr("["PTR_FORMAT","PTR_FORMAT"] " |
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2335 "max_live_bytes "SIZE_FORMAT" " |
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2336 "< calculated "SIZE_FORMAT, |
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2337 r->bottom(), r->end(), |
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2338 r->max_live_bytes(), |
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2339 not_dead_yet_cl.live_bytes()); |
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2340 _failures = true; |
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2341 } |
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2342 } |
342 | 2343 } |
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2344 return false; // stop the region iteration if we hit a failure |
342 | 2345 } |
2346 }; | |
2347 | |
2348 class VerifyRootsClosure: public OopsInGenClosure { | |
2349 private: | |
2350 G1CollectedHeap* _g1h; | |
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2351 bool _use_prev_marking; |
342 | 2352 bool _failures; |
2353 public: | |
811 | 2354 // use_prev_marking == true -> use "prev" marking information, |
2355 // use_prev_marking == false -> use "next" marking information | |
2356 VerifyRootsClosure(bool use_prev_marking) : | |
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2357 _g1h(G1CollectedHeap::heap()), |
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2358 _use_prev_marking(use_prev_marking), |
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2359 _failures(false) { } |
342 | 2360 |
2361 bool failures() { return _failures; } | |
2362 | |
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2363 template <class T> void do_oop_nv(T* p) { |
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2364 T heap_oop = oopDesc::load_heap_oop(p); |
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2365 if (!oopDesc::is_null(heap_oop)) { |
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2366 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
811 | 2367 if (_g1h->is_obj_dead_cond(obj, _use_prev_marking)) { |
342 | 2368 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
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2369 "points to dead obj "PTR_FORMAT, p, (void*) obj); |
342 | 2370 obj->print_on(gclog_or_tty); |
2371 _failures = true; | |
2372 } | |
2373 } | |
2374 } | |
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2375 |
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2376 void do_oop(oop* p) { do_oop_nv(p); } |
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2377 void do_oop(narrowOop* p) { do_oop_nv(p); } |
342 | 2378 }; |
2379 | |
390 | 2380 // This is the task used for parallel heap verification. |
2381 | |
2382 class G1ParVerifyTask: public AbstractGangTask { | |
2383 private: | |
2384 G1CollectedHeap* _g1h; | |
2385 bool _allow_dirty; | |
811 | 2386 bool _use_prev_marking; |
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2387 bool _failures; |
390 | 2388 |
2389 public: | |
811 | 2390 // use_prev_marking == true -> use "prev" marking information, |
2391 // use_prev_marking == false -> use "next" marking information | |
2392 G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty, | |
2393 bool use_prev_marking) : | |
390 | 2394 AbstractGangTask("Parallel verify task"), |
845
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2395 _g1h(g1h), |
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2396 _allow_dirty(allow_dirty), |
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2397 _use_prev_marking(use_prev_marking), |
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2398 _failures(false) { } |
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2399 |
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2400 bool failures() { |
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2401 return _failures; |
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2402 } |
390 | 2403 |
2404 void work(int worker_i) { | |
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2405 HandleMark hm; |
811 | 2406 VerifyRegionClosure blk(_allow_dirty, true, _use_prev_marking); |
390 | 2407 _g1h->heap_region_par_iterate_chunked(&blk, worker_i, |
2408 HeapRegion::ParVerifyClaimValue); | |
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2409 if (blk.failures()) { |
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2410 _failures = true; |
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2411 } |
390 | 2412 } |
2413 }; | |
2414 | |
342 | 2415 void G1CollectedHeap::verify(bool allow_dirty, bool silent) { |
811 | 2416 verify(allow_dirty, silent, /* use_prev_marking */ true); |
2417 } | |
2418 | |
2419 void G1CollectedHeap::verify(bool allow_dirty, | |
2420 bool silent, | |
2421 bool use_prev_marking) { | |
342 | 2422 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
2423 if (!silent) { gclog_or_tty->print("roots "); } | |
811 | 2424 VerifyRootsClosure rootsCl(use_prev_marking); |
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2425 CodeBlobToOopClosure blobsCl(&rootsCl, /*do_marking=*/ false); |
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2426 process_strong_roots(true, // activate StrongRootsScope |
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2427 false, |
342 | 2428 SharedHeap::SO_AllClasses, |
2429 &rootsCl, | |
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2430 &blobsCl, |
342 | 2431 &rootsCl); |
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2432 bool failures = rootsCl.failures(); |
342 | 2433 rem_set()->invalidate(perm_gen()->used_region(), false); |
2434 if (!silent) { gclog_or_tty->print("heapRegions "); } | |
390 | 2435 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
2436 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2437 "sanity check"); | |
2438 | |
811 | 2439 G1ParVerifyTask task(this, allow_dirty, use_prev_marking); |
390 | 2440 int n_workers = workers()->total_workers(); |
2441 set_par_threads(n_workers); | |
2442 workers()->run_task(&task); | |
2443 set_par_threads(0); | |
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2444 if (task.failures()) { |
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2445 failures = true; |
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2446 } |
390 | 2447 |
2448 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), | |
2449 "sanity check"); | |
2450 | |
2451 reset_heap_region_claim_values(); | |
2452 | |
2453 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2454 "sanity check"); | |
2455 } else { | |
811 | 2456 VerifyRegionClosure blk(allow_dirty, false, use_prev_marking); |
390 | 2457 _hrs->iterate(&blk); |
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2458 if (blk.failures()) { |
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2459 failures = true; |
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2460 } |
390 | 2461 } |
342 | 2462 if (!silent) gclog_or_tty->print("remset "); |
2463 rem_set()->verify(); | |
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2464 |
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2465 if (failures) { |
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2466 gclog_or_tty->print_cr("Heap:"); |
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2467 print_on(gclog_or_tty, true /* extended */); |
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2468 gclog_or_tty->print_cr(""); |
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2469 #ifndef PRODUCT |
1044 | 2470 if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) { |
1388 | 2471 concurrent_mark()->print_reachable("at-verification-failure", |
2472 use_prev_marking, false /* all */); | |
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2473 } |
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2474 #endif |
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2475 gclog_or_tty->flush(); |
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2476 } |
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2477 guarantee(!failures, "there should not have been any failures"); |
342 | 2478 } else { |
2479 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
2480 } | |
2481 } | |
2482 | |
2483 class PrintRegionClosure: public HeapRegionClosure { | |
2484 outputStream* _st; | |
2485 public: | |
2486 PrintRegionClosure(outputStream* st) : _st(st) {} | |
2487 bool doHeapRegion(HeapRegion* r) { | |
2488 r->print_on(_st); | |
2489 return false; | |
2490 } | |
2491 }; | |
2492 | |
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2493 void G1CollectedHeap::print() const { print_on(tty); } |
342 | 2494 |
2495 void G1CollectedHeap::print_on(outputStream* st) const { | |
838
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2496 print_on(st, PrintHeapAtGCExtended); |
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2497 } |
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2498 |
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2499 void G1CollectedHeap::print_on(outputStream* st, bool extended) const { |
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2500 st->print(" %-20s", "garbage-first heap"); |
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2501 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
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2502 capacity()/K, used_unlocked()/K); |
838
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2503 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
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2504 _g1_storage.low_boundary(), |
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2505 _g1_storage.high(), |
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2506 _g1_storage.high_boundary()); |
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2507 st->cr(); |
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2508 st->print(" region size " SIZE_FORMAT "K, ", |
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2509 HeapRegion::GrainBytes/K); |
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2510 size_t young_regions = _young_list->length(); |
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2511 st->print(SIZE_FORMAT " young (" SIZE_FORMAT "K), ", |
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2512 young_regions, young_regions * HeapRegion::GrainBytes / K); |
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2513 size_t survivor_regions = g1_policy()->recorded_survivor_regions(); |
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2514 st->print(SIZE_FORMAT " survivors (" SIZE_FORMAT "K)", |
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2515 survivor_regions, survivor_regions * HeapRegion::GrainBytes / K); |
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2516 st->cr(); |
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2517 perm()->as_gen()->print_on(st); |
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2518 if (extended) { |
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2519 st->cr(); |
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2520 print_on_extended(st); |
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2521 } |
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2522 } |
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2523 |
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2524 void G1CollectedHeap::print_on_extended(outputStream* st) const { |
342 | 2525 PrintRegionClosure blk(st); |
2526 _hrs->iterate(&blk); | |
2527 } | |
2528 | |
2529 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { | |
2530 if (ParallelGCThreads > 0) { | |
1019 | 2531 workers()->print_worker_threads_on(st); |
2532 } | |
2533 | |
2534 _cmThread->print_on(st); | |
342 | 2535 st->cr(); |
1019 | 2536 |
2537 _cm->print_worker_threads_on(st); | |
2538 | |
2539 _cg1r->print_worker_threads_on(st); | |
2540 | |
342 | 2541 _czft->print_on(st); |
2542 st->cr(); | |
2543 } | |
2544 | |
2545 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
2546 if (ParallelGCThreads > 0) { | |
2547 workers()->threads_do(tc); | |
2548 } | |
2549 tc->do_thread(_cmThread); | |
794 | 2550 _cg1r->threads_do(tc); |
342 | 2551 tc->do_thread(_czft); |
2552 } | |
2553 | |
2554 void G1CollectedHeap::print_tracing_info() const { | |
2555 // We'll overload this to mean "trace GC pause statistics." | |
2556 if (TraceGen0Time || TraceGen1Time) { | |
2557 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
2558 // to that. | |
2559 g1_policy()->print_tracing_info(); | |
2560 } | |
751 | 2561 if (G1SummarizeRSetStats) { |
342 | 2562 g1_rem_set()->print_summary_info(); |
2563 } | |
1282 | 2564 if (G1SummarizeConcMark) { |
342 | 2565 concurrent_mark()->print_summary_info(); |
2566 } | |
751 | 2567 if (G1SummarizeZFStats) { |
342 | 2568 ConcurrentZFThread::print_summary_info(); |
2569 } | |
2570 g1_policy()->print_yg_surv_rate_info(); | |
2571 | |
2572 SpecializationStats::print(); | |
2573 } | |
2574 | |
2575 | |
2576 int G1CollectedHeap::addr_to_arena_id(void* addr) const { | |
2577 HeapRegion* hr = heap_region_containing(addr); | |
2578 if (hr == NULL) { | |
2579 return 0; | |
2580 } else { | |
2581 return 1; | |
2582 } | |
2583 } | |
2584 | |
2585 G1CollectedHeap* G1CollectedHeap::heap() { | |
2586 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
2587 "not a garbage-first heap"); | |
2588 return _g1h; | |
2589 } | |
2590 | |
2591 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
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2592 // always_do_update_barrier = false; |
342 | 2593 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
2594 // Call allocation profiler | |
2595 AllocationProfiler::iterate_since_last_gc(); | |
2596 // Fill TLAB's and such | |
2597 ensure_parsability(true); | |
2598 } | |
2599 | |
2600 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
2601 // FIXME: what is this about? | |
2602 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
2603 // is set. | |
2604 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
2605 "derived pointer present")); | |
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2606 // always_do_update_barrier = true; |
342 | 2607 } |
2608 | |
2609 void G1CollectedHeap::do_collection_pause() { | |
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2610 assert(Heap_lock->owned_by_self(), "we assume we'reholding the Heap_lock"); |
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2611 |
342 | 2612 // Read the GC count while holding the Heap_lock |
2613 // we need to do this _before_ wait_for_cleanup_complete(), to | |
2614 // ensure that we do not give up the heap lock and potentially | |
2615 // pick up the wrong count | |
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2616 unsigned int gc_count_before = SharedHeap::heap()->total_collections(); |
342 | 2617 |
2618 // Don't want to do a GC pause while cleanup is being completed! | |
2619 wait_for_cleanup_complete(); | |
2620 | |
2621 g1_policy()->record_stop_world_start(); | |
2622 { | |
2623 MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back | |
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2624 VM_G1IncCollectionPause op(gc_count_before, |
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2625 false, /* should_initiate_conc_mark */ |
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2626 g1_policy()->max_pause_time_ms(), |
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2627 GCCause::_g1_inc_collection_pause); |
342 | 2628 VMThread::execute(&op); |
2629 } | |
2630 } | |
2631 | |
2632 void | |
2633 G1CollectedHeap::doConcurrentMark() { | |
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2634 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
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2635 if (!_cmThread->in_progress()) { |
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2636 _cmThread->set_started(); |
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2637 CGC_lock->notify(); |
342 | 2638 } |
2639 } | |
2640 | |
2641 class VerifyMarkedObjsClosure: public ObjectClosure { | |
2642 G1CollectedHeap* _g1h; | |
2643 public: | |
2644 VerifyMarkedObjsClosure(G1CollectedHeap* g1h) : _g1h(g1h) {} | |
2645 void do_object(oop obj) { | |
2646 assert(obj->mark()->is_marked() ? !_g1h->is_obj_dead(obj) : true, | |
2647 "markandsweep mark should agree with concurrent deadness"); | |
2648 } | |
2649 }; | |
2650 | |
2651 void | |
2652 G1CollectedHeap::checkConcurrentMark() { | |
2653 VerifyMarkedObjsClosure verifycl(this); | |
2654 // MutexLockerEx x(getMarkBitMapLock(), | |
2655 // Mutex::_no_safepoint_check_flag); | |
678 | 2656 object_iterate(&verifycl, false); |
342 | 2657 } |
2658 | |
2659 void G1CollectedHeap::do_sync_mark() { | |
2660 _cm->checkpointRootsInitial(); | |
2661 _cm->markFromRoots(); | |
2662 _cm->checkpointRootsFinal(false); | |
2663 } | |
2664 | |
2665 // <NEW PREDICTION> | |
2666 | |
2667 double G1CollectedHeap::predict_region_elapsed_time_ms(HeapRegion *hr, | |
2668 bool young) { | |
2669 return _g1_policy->predict_region_elapsed_time_ms(hr, young); | |
2670 } | |
2671 | |
2672 void G1CollectedHeap::check_if_region_is_too_expensive(double | |
2673 predicted_time_ms) { | |
2674 _g1_policy->check_if_region_is_too_expensive(predicted_time_ms); | |
2675 } | |
2676 | |
2677 size_t G1CollectedHeap::pending_card_num() { | |
2678 size_t extra_cards = 0; | |
2679 JavaThread *curr = Threads::first(); | |
2680 while (curr != NULL) { | |
2681 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
2682 extra_cards += dcq.size(); | |
2683 curr = curr->next(); | |
2684 } | |
2685 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
2686 size_t buffer_size = dcqs.buffer_size(); | |
2687 size_t buffer_num = dcqs.completed_buffers_num(); | |
2688 return buffer_size * buffer_num + extra_cards; | |
2689 } | |
2690 | |
2691 size_t G1CollectedHeap::max_pending_card_num() { | |
2692 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
2693 size_t buffer_size = dcqs.buffer_size(); | |
2694 size_t buffer_num = dcqs.completed_buffers_num(); | |
2695 int thread_num = Threads::number_of_threads(); | |
2696 return (buffer_num + thread_num) * buffer_size; | |
2697 } | |
2698 | |
2699 size_t G1CollectedHeap::cards_scanned() { | |
2700 HRInto_G1RemSet* g1_rset = (HRInto_G1RemSet*) g1_rem_set(); | |
2701 return g1_rset->cardsScanned(); | |
2702 } | |
2703 | |
2704 void | |
2705 G1CollectedHeap::setup_surviving_young_words() { | |
2706 guarantee( _surviving_young_words == NULL, "pre-condition" ); | |
2707 size_t array_length = g1_policy()->young_cset_length(); | |
2708 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, array_length); | |
2709 if (_surviving_young_words == NULL) { | |
2710 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
2711 "Not enough space for young surv words summary."); | |
2712 } | |
2713 memset(_surviving_young_words, 0, array_length * sizeof(size_t)); | |
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2714 #ifdef ASSERT |
342 | 2715 for (size_t i = 0; i < array_length; ++i) { |
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2716 assert( _surviving_young_words[i] == 0, "memset above" ); |
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2717 } |
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2718 #endif // !ASSERT |
342 | 2719 } |
2720 | |
2721 void | |
2722 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
2723 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
2724 size_t array_length = g1_policy()->young_cset_length(); | |
2725 for (size_t i = 0; i < array_length; ++i) | |
2726 _surviving_young_words[i] += surv_young_words[i]; | |
2727 } | |
2728 | |
2729 void | |
2730 G1CollectedHeap::cleanup_surviving_young_words() { | |
2731 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
2732 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
2733 _surviving_young_words = NULL; | |
2734 } | |
2735 | |
2736 // </NEW PREDICTION> | |
2737 | |
1261
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2738 struct PrepareForRSScanningClosure : public HeapRegionClosure { |
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2739 bool doHeapRegion(HeapRegion *r) { |
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2740 r->rem_set()->set_iter_claimed(0); |
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2741 return false; |
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2742 } |
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2743 }; |
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2744 |
1709 | 2745 #if TASKQUEUE_STATS |
2746 void G1CollectedHeap::print_taskqueue_stats_hdr(outputStream* const st) { | |
2747 st->print_raw_cr("GC Task Stats"); | |
2748 st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); | |
2749 st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); | |
2750 } | |
2751 | |
2752 void G1CollectedHeap::print_taskqueue_stats(outputStream* const st) const { | |
2753 print_taskqueue_stats_hdr(st); | |
2754 | |
2755 TaskQueueStats totals; | |
2756 const int n = MAX2(workers()->total_workers(), 1); | |
2757 for (int i = 0; i < n; ++i) { | |
2758 st->print("%3d ", i); task_queue(i)->stats.print(st); st->cr(); | |
2759 totals += task_queue(i)->stats; | |
2760 } | |
2761 st->print_raw("tot "); totals.print(st); st->cr(); | |
2762 | |
2763 DEBUG_ONLY(totals.verify()); | |
2764 } | |
2765 | |
2766 void G1CollectedHeap::reset_taskqueue_stats() { | |
2767 const int n = MAX2(workers()->total_workers(), 1); | |
2768 for (int i = 0; i < n; ++i) { | |
2769 task_queue(i)->stats.reset(); | |
2770 } | |
2771 } | |
2772 #endif // TASKQUEUE_STATS | |
2773 | |
342 | 2774 void |
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2775 G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { |
1359
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2776 if (GC_locker::check_active_before_gc()) { |
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2777 return; // GC is disabled (e.g. JNI GetXXXCritical operation) |
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2778 } |
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2779 |
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2780 if (PrintHeapAtGC) { |
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2781 Universe::print_heap_before_gc(); |
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2782 } |
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2783 |
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2784 { |
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2785 ResourceMark rm; |
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2786 |
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2787 // This call will decide whether this pause is an initial-mark |
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2788 // pause. If it is, during_initial_mark_pause() will return true |
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2789 // for the duration of this pause. |
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2790 g1_policy()->decide_on_conc_mark_initiation(); |
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2791 |
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2792 char verbose_str[128]; |
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2793 sprintf(verbose_str, "GC pause "); |
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2794 if (g1_policy()->in_young_gc_mode()) { |
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2795 if (g1_policy()->full_young_gcs()) |
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2796 strcat(verbose_str, "(young)"); |
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2797 else |
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2798 strcat(verbose_str, "(partial)"); |
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2799 } |
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2800 if (g1_policy()->during_initial_mark_pause()) { |
838
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2801 strcat(verbose_str, " (initial-mark)"); |
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2802 // We are about to start a marking cycle, so we increment the |
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2803 // full collection counter. |
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2804 increment_total_full_collections(); |
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2805 } |
838
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2806 |
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2807 // if PrintGCDetails is on, we'll print long statistics information |
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2808 // in the collector policy code, so let's not print this as the output |
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2809 // is messy if we do. |
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2810 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
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2811 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); |
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2812 TraceTime t(verbose_str, PrintGC && !PrintGCDetails, true, gclog_or_tty); |
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2813 |
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2814 TraceMemoryManagerStats tms(false /* fullGC */); |
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2815 |
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2816 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); |
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2817 assert(Thread::current() == VMThread::vm_thread(), "should be in vm thread"); |
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2818 guarantee(!is_gc_active(), "collection is not reentrant"); |
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2819 assert(regions_accounted_for(), "Region leakage!"); |
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2820 |
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2821 increment_gc_time_stamp(); |
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2822 |
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2823 if (g1_policy()->in_young_gc_mode()) { |
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2824 assert(check_young_list_well_formed(), |
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2825 "young list should be well formed"); |
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2826 } |
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2827 |
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2828 { // Call to jvmpi::post_class_unload_events must occur outside of active GC |
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2829 IsGCActiveMark x; |
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2830 |
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2831 gc_prologue(false); |
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2832 increment_total_collections(false /* full gc */); |
342 | 2833 |
2834 #if G1_REM_SET_LOGGING | |
838
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2835 gclog_or_tty->print_cr("\nJust chose CS, heap:"); |
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2836 print(); |
342 | 2837 #endif |
2838 | |
838
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2839 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
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2840 HandleMark hm; // Discard invalid handles created during verification |
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2841 prepare_for_verify(); |
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2842 gclog_or_tty->print(" VerifyBeforeGC:"); |
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2843 Universe::verify(false); |
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2844 } |
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2845 |
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2846 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
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2847 |
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2848 // We want to turn off ref discovery, if necessary, and turn it back on |
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2849 // on again later if we do. XXX Dubious: why is discovery disabled? |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2850 bool was_enabled = ref_processor()->discovery_enabled(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2851 if (was_enabled) ref_processor()->disable_discovery(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2852 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2853 // Forget the current alloc region (we might even choose it to be part |
0316eac49d5a
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|
2854 // of the collection set!). |
0316eac49d5a
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|
2855 abandon_cur_alloc_region(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2856 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2857 // The elapsed time induced by the start time below deliberately elides |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2858 // the possible verification above. |
0316eac49d5a
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|
2859 double start_time_sec = os::elapsedTime(); |
0316eac49d5a
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|
2860 size_t start_used_bytes = used(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2861 |
1394
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|
2862 #if YOUNG_LIST_VERBOSE |
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|
2863 gclog_or_tty->print_cr("\nBefore recording pause start.\nYoung_list:"); |
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|
2864 _young_list->print(); |
1316cec51b4d
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|
2865 g1_policy()->print_collection_set(g1_policy()->inc_cset_head(), gclog_or_tty); |
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|
2866 #endif // YOUNG_LIST_VERBOSE |
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|
2867 |
838
0316eac49d5a
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|
2868 g1_policy()->record_collection_pause_start(start_time_sec, |
0316eac49d5a
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|
2869 start_used_bytes); |
0316eac49d5a
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|
2870 |
1394
1316cec51b4d
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|
2871 #if YOUNG_LIST_VERBOSE |
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|
2872 gclog_or_tty->print_cr("\nAfter recording pause start.\nYoung_list:"); |
838
0316eac49d5a
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|
2873 _young_list->print(); |
1394
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|
2874 #endif // YOUNG_LIST_VERBOSE |
342 | 2875 |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2876 if (g1_policy()->during_initial_mark_pause()) { |
838
0316eac49d5a
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|
2877 concurrent_mark()->checkpointRootsInitialPre(); |
0316eac49d5a
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|
2878 } |
0316eac49d5a
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|
2879 save_marks(); |
0316eac49d5a
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|
2880 |
0316eac49d5a
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|
2881 // We must do this before any possible evacuation that should propagate |
0316eac49d5a
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|
2882 // marks. |
0316eac49d5a
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|
2883 if (mark_in_progress()) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2884 double start_time_sec = os::elapsedTime(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2885 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2886 _cm->drainAllSATBBuffers(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2887 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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|
2888 g1_policy()->record_satb_drain_time(finish_mark_ms); |
0316eac49d5a
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|
2889 } |
0316eac49d5a
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changeset
|
2890 // Record the number of elements currently on the mark stack, so we |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2891 // only iterate over these. (Since evacuation may add to the mark |
0316eac49d5a
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|
2892 // stack, doing more exposes race conditions.) If no mark is in |
0316eac49d5a
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|
2893 // progress, this will be zero. |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2894 _cm->set_oops_do_bound(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2895 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2896 assert(regions_accounted_for(), "Region leakage."); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2897 |
0316eac49d5a
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|
2898 if (mark_in_progress()) |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2899 concurrent_mark()->newCSet(); |
0316eac49d5a
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|
2900 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2901 #if YOUNG_LIST_VERBOSE |
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|
2902 gclog_or_tty->print_cr("\nBefore choosing collection set.\nYoung_list:"); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2903 _young_list->print(); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2904 g1_policy()->print_collection_set(g1_policy()->inc_cset_head(), gclog_or_tty); |
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|
2905 #endif // YOUNG_LIST_VERBOSE |
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|
2906 |
1707 | 2907 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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|
2908 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2909 // Nothing to do if we were unable to choose a collection set. |
342 | 2910 #if G1_REM_SET_LOGGING |
1707 | 2911 gclog_or_tty->print_cr("\nAfter pause, heap:"); |
2912 print(); | |
342 | 2913 #endif |
1707 | 2914 PrepareForRSScanningClosure prepare_for_rs_scan; |
2915 collection_set_iterate(&prepare_for_rs_scan); | |
2916 | |
2917 setup_surviving_young_words(); | |
2918 | |
2919 // Set up the gc allocation regions. | |
2920 get_gc_alloc_regions(); | |
2921 | |
2922 // Actually do the work... | |
2923 evacuate_collection_set(); | |
2924 | |
2925 free_collection_set(g1_policy()->collection_set()); | |
2926 g1_policy()->clear_collection_set(); | |
2927 | |
2928 cleanup_surviving_young_words(); | |
2929 | |
2930 // Start a new incremental collection set for the next pause. | |
2931 g1_policy()->start_incremental_cset_building(); | |
2932 | |
2933 // Clear the _cset_fast_test bitmap in anticipation of adding | |
2934 // regions to the incremental collection set for the next | |
2935 // evacuation pause. | |
2936 clear_cset_fast_test(); | |
2937 | |
2938 if (g1_policy()->in_young_gc_mode()) { | |
2939 _young_list->reset_sampled_info(); | |
2940 | |
2941 // Don't check the whole heap at this point as the | |
2942 // GC alloc regions from this pause have been tagged | |
2943 // as survivors and moved on to the survivor list. | |
2944 // Survivor regions will fail the !is_young() check. | |
2945 assert(check_young_list_empty(false /* check_heap */), | |
2946 "young list should be empty"); | |
1394
1316cec51b4d
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|
2947 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2948 #if YOUNG_LIST_VERBOSE |
1707 | 2949 gclog_or_tty->print_cr("Before recording survivors.\nYoung List:"); |
2950 _young_list->print(); | |
1394
1316cec51b4d
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|
2951 #endif // YOUNG_LIST_VERBOSE |
342 | 2952 |
1707 | 2953 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
838
0316eac49d5a
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|
2954 _young_list->first_survivor_region(), |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2955 _young_list->last_survivor_region()); |
1394
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|
2956 |
1707 | 2957 _young_list->reset_auxilary_lists(); |
342 | 2958 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2959 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2960 if (evacuation_failed()) { |
0316eac49d5a
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|
2961 _summary_bytes_used = recalculate_used(); |
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6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
2962 } else { |
0316eac49d5a
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|
2963 // The "used" of the the collection set have already been subtracted |
0316eac49d5a
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diff
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|
2964 // when they were freed. Add in the bytes evacuated. |
0316eac49d5a
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|
2965 _summary_bytes_used += g1_policy()->bytes_in_to_space(); |
0316eac49d5a
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|
2966 } |
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|
2967 |
0316eac49d5a
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|
2968 if (g1_policy()->in_young_gc_mode() && |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1313
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|
2969 g1_policy()->during_initial_mark_pause()) { |
838
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|
2970 concurrent_mark()->checkpointRootsInitialPost(); |
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|
2971 set_marking_started(); |
845
df6caf649ff7
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diff
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|
2972 // CAUTION: after the doConcurrentMark() call below, |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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838
diff
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|
2973 // the concurrent marking thread(s) could be running |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
2974 // concurrently with us. Make sure that anything after |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
2975 // this point does not assume that we are the only GC thread |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
2976 // running. Note: of course, the actual marking work will |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
2977 // not start until the safepoint itself is released in |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
2978 // ConcurrentGCThread::safepoint_desynchronize(). |
838
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|
2979 doConcurrentMark(); |
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|
2980 } |
342 | 2981 |
1394
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|
2982 #if YOUNG_LIST_VERBOSE |
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|
2983 gclog_or_tty->print_cr("\nEnd of the pause.\nYoung_list:"); |
838
0316eac49d5a
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|
2984 _young_list->print(); |
1394
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diff
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|
2985 g1_policy()->print_collection_set(g1_policy()->inc_cset_head(), gclog_or_tty); |
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|
2986 #endif // YOUNG_LIST_VERBOSE |
342 | 2987 |
838
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diff
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|
2988 double end_time_sec = os::elapsedTime(); |
0316eac49d5a
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|
2989 double pause_time_ms = (end_time_sec - start_time_sec) * MILLIUNITS; |
0316eac49d5a
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|
2990 g1_policy()->record_pause_time_ms(pause_time_ms); |
1707 | 2991 g1_policy()->record_collection_pause_end(); |
838
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|
2992 |
0316eac49d5a
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|
2993 assert(regions_accounted_for(), "Region leakage."); |
0316eac49d5a
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|
2994 |
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
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diff
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|
2995 MemoryService::track_memory_usage(); |
db0d5eba9d20
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1088
diff
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|
2996 |
838
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|
2997 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
0316eac49d5a
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|
2998 HandleMark hm; // Discard invalid handles created during verification |
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|
2999 gclog_or_tty->print(" VerifyAfterGC:"); |
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|
3000 prepare_for_verify(); |
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|
3001 Universe::verify(false); |
342 | 3002 } |
838
0316eac49d5a
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tonyp
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811
diff
changeset
|
3003 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3004 if (was_enabled) ref_processor()->enable_discovery(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3005 |
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 size_t expand_bytes = g1_policy()->expansion_amount(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3008 if (expand_bytes > 0) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3009 size_t bytes_before = capacity(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3010 expand(expand_bytes); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3011 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3012 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3013 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3014 if (mark_in_progress()) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3015 concurrent_mark()->update_g1_committed(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3016 } |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3017 |
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3018 #ifdef TRACESPINNING |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3019 ParallelTaskTerminator::print_termination_counts(); |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3020 #endif |
342 | 3021 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3022 gc_epilogue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3023 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3024 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3025 assert(verify_region_lists(), "Bad region lists."); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3026 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3027 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3028 gclog_or_tty->print_cr("Stopping after GC #%d", ExitAfterGCNum); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3029 print_tracing_info(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3030 vm_exit(-1); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3031 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3032 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3033 |
1709 | 3034 TASKQUEUE_STATS_ONLY(if (ParallelGCVerbose) print_taskqueue_stats()); |
3035 TASKQUEUE_STATS_ONLY(reset_taskqueue_stats()); | |
3036 | |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3037 if (PrintHeapAtGC) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3038 Universe::print_heap_after_gc(); |
342 | 3039 } |
884
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3040 if (G1SummarizeRSetStats && |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3041 (G1SummarizeRSetStatsPeriod > 0) && |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3042 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3043 g1_rem_set()->print_summary_info(); |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3044 } |
342 | 3045 } |
3046 | |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3047 size_t G1CollectedHeap::desired_plab_sz(GCAllocPurpose purpose) |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3048 { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3049 size_t gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3050 switch (purpose) { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3051 case GCAllocForSurvived: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3052 gclab_word_size = YoungPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3053 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3054 case GCAllocForTenured: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3055 gclab_word_size = OldPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3056 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3057 default: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3058 assert(false, "unknown GCAllocPurpose"); |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3059 gclab_word_size = OldPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3060 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3061 } |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3062 return gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3063 } |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3064 |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3065 |
342 | 3066 void G1CollectedHeap::set_gc_alloc_region(int purpose, HeapRegion* r) { |
3067 assert(purpose >= 0 && purpose < GCAllocPurposeCount, "invalid purpose"); | |
636 | 3068 // make sure we don't call set_gc_alloc_region() multiple times on |
3069 // the same region | |
3070 assert(r == NULL || !r->is_gc_alloc_region(), | |
3071 "shouldn't already be a GC alloc region"); | |
1360
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3072 assert(r == NULL || !r->isHumongous(), |
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3073 "humongous regions shouldn't be used as GC alloc regions"); |
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3074 |
342 | 3075 HeapWord* original_top = NULL; |
3076 if (r != NULL) | |
3077 original_top = r->top(); | |
3078 | |
3079 // We will want to record the used space in r as being there before gc. | |
3080 // One we install it as a GC alloc region it's eligible for allocation. | |
3081 // So record it now and use it later. | |
3082 size_t r_used = 0; | |
3083 if (r != NULL) { | |
3084 r_used = r->used(); | |
3085 | |
3086 if (ParallelGCThreads > 0) { | |
3087 // need to take the lock to guard against two threads calling | |
3088 // get_gc_alloc_region concurrently (very unlikely but...) | |
3089 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
3090 r->save_marks(); | |
3091 } | |
3092 } | |
3093 HeapRegion* old_alloc_region = _gc_alloc_regions[purpose]; | |
3094 _gc_alloc_regions[purpose] = r; | |
3095 if (old_alloc_region != NULL) { | |
3096 // Replace aliases too. | |
3097 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
3098 if (_gc_alloc_regions[ap] == old_alloc_region) { | |
3099 _gc_alloc_regions[ap] = r; | |
3100 } | |
3101 } | |
3102 } | |
3103 if (r != NULL) { | |
3104 push_gc_alloc_region(r); | |
3105 if (mark_in_progress() && original_top != r->next_top_at_mark_start()) { | |
3106 // We are using a region as a GC alloc region after it has been used | |
3107 // as a mutator allocation region during the current marking cycle. | |
3108 // The mutator-allocated objects are currently implicitly marked, but | |
3109 // when we move hr->next_top_at_mark_start() forward at the the end | |
3110 // of the GC pause, they won't be. We therefore mark all objects in | |
3111 // the "gap". We do this object-by-object, since marking densely | |
3112 // does not currently work right with marking bitmap iteration. This | |
3113 // means we rely on TLAB filling at the start of pauses, and no | |
3114 // "resuscitation" of filled TLAB's. If we want to do this, we need | |
3115 // to fix the marking bitmap iteration. | |
3116 HeapWord* curhw = r->next_top_at_mark_start(); | |
3117 HeapWord* t = original_top; | |
3118 | |
3119 while (curhw < t) { | |
3120 oop cur = (oop)curhw; | |
3121 // We'll assume parallel for generality. This is rare code. | |
3122 concurrent_mark()->markAndGrayObjectIfNecessary(cur); // can't we just mark them? | |
3123 curhw = curhw + cur->size(); | |
3124 } | |
3125 assert(curhw == t, "Should have parsed correctly."); | |
3126 } | |
3127 if (G1PolicyVerbose > 1) { | |
3128 gclog_or_tty->print("New alloc region ["PTR_FORMAT", "PTR_FORMAT", " PTR_FORMAT") " | |
3129 "for survivors:", r->bottom(), original_top, r->end()); | |
3130 r->print(); | |
3131 } | |
3132 g1_policy()->record_before_bytes(r_used); | |
3133 } | |
3134 } | |
3135 | |
3136 void G1CollectedHeap::push_gc_alloc_region(HeapRegion* hr) { | |
3137 assert(Thread::current()->is_VM_thread() || | |
3138 par_alloc_during_gc_lock()->owned_by_self(), "Precondition"); | |
3139 assert(!hr->is_gc_alloc_region() && !hr->in_collection_set(), | |
3140 "Precondition."); | |
3141 hr->set_is_gc_alloc_region(true); | |
3142 hr->set_next_gc_alloc_region(_gc_alloc_region_list); | |
3143 _gc_alloc_region_list = hr; | |
3144 } | |
3145 | |
3146 #ifdef G1_DEBUG | |
3147 class FindGCAllocRegion: public HeapRegionClosure { | |
3148 public: | |
3149 bool doHeapRegion(HeapRegion* r) { | |
3150 if (r->is_gc_alloc_region()) { | |
3151 gclog_or_tty->print_cr("Region %d ["PTR_FORMAT"...] is still a gc_alloc_region.", | |
3152 r->hrs_index(), r->bottom()); | |
3153 } | |
3154 return false; | |
3155 } | |
3156 }; | |
3157 #endif // G1_DEBUG | |
3158 | |
3159 void G1CollectedHeap::forget_alloc_region_list() { | |
3160 assert(Thread::current()->is_VM_thread(), "Precondition"); | |
3161 while (_gc_alloc_region_list != NULL) { | |
3162 HeapRegion* r = _gc_alloc_region_list; | |
3163 assert(r->is_gc_alloc_region(), "Invariant."); | |
637
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3164 // We need HeapRegion::oops_on_card_seq_iterate_careful() to work on |
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3165 // newly allocated data in order to be able to apply deferred updates |
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3166 // before the GC is done for verification purposes (i.e to allow |
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3167 // G1HRRSFlushLogBuffersOnVerify). It's safe thing to do after the |
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3168 // collection. |
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3169 r->ContiguousSpace::set_saved_mark(); |
342 | 3170 _gc_alloc_region_list = r->next_gc_alloc_region(); |
3171 r->set_next_gc_alloc_region(NULL); | |
3172 r->set_is_gc_alloc_region(false); | |
545 | 3173 if (r->is_survivor()) { |
3174 if (r->is_empty()) { | |
3175 r->set_not_young(); | |
3176 } else { | |
3177 _young_list->add_survivor_region(r); | |
3178 } | |
3179 } | |
342 | 3180 if (r->is_empty()) { |
3181 ++_free_regions; | |
3182 } | |
3183 } | |
3184 #ifdef G1_DEBUG | |
3185 FindGCAllocRegion fa; | |
3186 heap_region_iterate(&fa); | |
3187 #endif // G1_DEBUG | |
3188 } | |
3189 | |
3190 | |
3191 bool G1CollectedHeap::check_gc_alloc_regions() { | |
3192 // TODO: allocation regions check | |
3193 return true; | |
3194 } | |
3195 | |
3196 void G1CollectedHeap::get_gc_alloc_regions() { | |
636 | 3197 // First, let's check that the GC alloc region list is empty (it should) |
3198 assert(_gc_alloc_region_list == NULL, "invariant"); | |
3199 | |
342 | 3200 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
636 | 3201 assert(_gc_alloc_regions[ap] == NULL, "invariant"); |
861
45d97a99715b
6862661: G1: _gc_alloc_region_counts is not updated properly after 6604422
apetrusenko
parents:
846
diff
changeset
|
3202 assert(_gc_alloc_region_counts[ap] == 0, "invariant"); |
636 | 3203 |
342 | 3204 // Create new GC alloc regions. |
636 | 3205 HeapRegion* alloc_region = _retained_gc_alloc_regions[ap]; |
3206 _retained_gc_alloc_regions[ap] = NULL; | |
3207 | |
3208 if (alloc_region != NULL) { | |
3209 assert(_retain_gc_alloc_region[ap], "only way to retain a GC region"); | |
3210 | |
3211 // let's make sure that the GC alloc region is not tagged as such | |
3212 // outside a GC operation | |
3213 assert(!alloc_region->is_gc_alloc_region(), "sanity"); | |
3214 | |
3215 if (alloc_region->in_collection_set() || | |
3216 alloc_region->top() == alloc_region->end() || | |
1360
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3217 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
|
3218 alloc_region->isHumongous()) { |
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3219 // we will discard the current GC alloc region if |
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3220 // * 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
|
3221 // * 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
|
3222 // * 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
|
3223 // 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
|
3224 // * 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
|
3225 // 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
|
3226 // has been subseqently used to allocate a humongous |
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3227 // object that may be less than the region size). |
636 | 3228 |
3229 alloc_region = NULL; | |
3230 } | |
3231 } | |
3232 | |
3233 if (alloc_region == NULL) { | |
3234 // we will get a new GC alloc region | |
342 | 3235 alloc_region = newAllocRegionWithExpansion(ap, 0); |
861
45d97a99715b
6862661: G1: _gc_alloc_region_counts is not updated properly after 6604422
apetrusenko
parents:
846
diff
changeset
|
3236 } else { |
45d97a99715b
6862661: G1: _gc_alloc_region_counts is not updated properly after 6604422
apetrusenko
parents:
846
diff
changeset
|
3237 // the region was retained from the last collection |
45d97a99715b
6862661: G1: _gc_alloc_region_counts is not updated properly after 6604422
apetrusenko
parents:
846
diff
changeset
|
3238 ++_gc_alloc_region_counts[ap]; |
1388 | 3239 if (G1PrintHeapRegions) { |
3240 gclog_or_tty->print_cr("new alloc region %d:["PTR_FORMAT", "PTR_FORMAT"], " | |
3241 "top "PTR_FORMAT, | |
3242 alloc_region->hrs_index(), alloc_region->bottom(), alloc_region->end(), alloc_region->top()); | |
3243 } | |
342 | 3244 } |
636 | 3245 |
342 | 3246 if (alloc_region != NULL) { |
636 | 3247 assert(_gc_alloc_regions[ap] == NULL, "pre-condition"); |
342 | 3248 set_gc_alloc_region(ap, alloc_region); |
3249 } | |
636 | 3250 |
3251 assert(_gc_alloc_regions[ap] == NULL || | |
3252 _gc_alloc_regions[ap]->is_gc_alloc_region(), | |
3253 "the GC alloc region should be tagged as such"); | |
3254 assert(_gc_alloc_regions[ap] == NULL || | |
3255 _gc_alloc_regions[ap] == _gc_alloc_region_list, | |
3256 "the GC alloc region should be the same as the GC alloc list head"); | |
342 | 3257 } |
3258 // Set alternative regions for allocation purposes that have reached | |
636 | 3259 // their limit. |
342 | 3260 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
3261 GCAllocPurpose alt_purpose = g1_policy()->alternative_purpose(ap); | |
3262 if (_gc_alloc_regions[ap] == NULL && alt_purpose != ap) { | |
3263 _gc_alloc_regions[ap] = _gc_alloc_regions[alt_purpose]; | |
3264 } | |
3265 } | |
3266 assert(check_gc_alloc_regions(), "alloc regions messed up"); | |
3267 } | |
3268 | |
636 | 3269 void G1CollectedHeap::release_gc_alloc_regions(bool totally) { |
342 | 3270 // We keep a separate list of all regions that have been alloc regions in |
636 | 3271 // the current collection pause. Forget that now. This method will |
3272 // untag the GC alloc regions and tear down the GC alloc region | |
3273 // list. It's desirable that no regions are tagged as GC alloc | |
3274 // outside GCs. | |
342 | 3275 forget_alloc_region_list(); |
3276 | |
3277 // The current alloc regions contain objs that have survived | |
3278 // collection. Make them no longer GC alloc regions. | |
3279 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
3280 HeapRegion* r = _gc_alloc_regions[ap]; | |
636 | 3281 _retained_gc_alloc_regions[ap] = NULL; |
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3282 _gc_alloc_region_counts[ap] = 0; |
636 | 3283 |
3284 if (r != NULL) { | |
3285 // we retain nothing on _gc_alloc_regions between GCs | |
3286 set_gc_alloc_region(ap, NULL); | |
3287 | |
3288 if (r->is_empty()) { | |
3289 // we didn't actually allocate anything in it; let's just put | |
3290 // it on the free list | |
342 | 3291 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); |
3292 r->set_zero_fill_complete(); | |
3293 put_free_region_on_list_locked(r); | |
636 | 3294 } else if (_retain_gc_alloc_region[ap] && !totally) { |
3295 // retain it so that we can use it at the beginning of the next GC | |
3296 _retained_gc_alloc_regions[ap] = r; | |
342 | 3297 } |
3298 } | |
636 | 3299 } |
3300 } | |
3301 | |
3302 #ifndef PRODUCT | |
3303 // Useful for debugging | |
3304 | |
3305 void G1CollectedHeap::print_gc_alloc_regions() { | |
3306 gclog_or_tty->print_cr("GC alloc regions"); | |
3307 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
3308 HeapRegion* r = _gc_alloc_regions[ap]; | |
3309 if (r == NULL) { | |
3310 gclog_or_tty->print_cr(" %2d : "PTR_FORMAT, ap, NULL); | |
3311 } else { | |
3312 gclog_or_tty->print_cr(" %2d : "PTR_FORMAT" "SIZE_FORMAT, | |
3313 ap, r->bottom(), r->used()); | |
3314 } | |
3315 } | |
3316 } | |
3317 #endif // PRODUCT | |
342 | 3318 |
3319 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
3320 _drain_in_progress = false; | |
3321 set_evac_failure_closure(cl); | |
3322 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
3323 } | |
3324 | |
3325 void G1CollectedHeap::finalize_for_evac_failure() { | |
3326 assert(_evac_failure_scan_stack != NULL && | |
3327 _evac_failure_scan_stack->length() == 0, | |
3328 "Postcondition"); | |
3329 assert(!_drain_in_progress, "Postcondition"); | |
1045 | 3330 delete _evac_failure_scan_stack; |
342 | 3331 _evac_failure_scan_stack = NULL; |
3332 } | |
3333 | |
3334 | |
3335 | |
3336 // *** Sequential G1 Evacuation | |
3337 | |
3338 HeapWord* G1CollectedHeap::allocate_during_gc(GCAllocPurpose purpose, size_t word_size) { | |
3339 HeapRegion* alloc_region = _gc_alloc_regions[purpose]; | |
3340 // let the caller handle alloc failure | |
3341 if (alloc_region == NULL) return NULL; | |
3342 assert(isHumongous(word_size) || !alloc_region->isHumongous(), | |
3343 "Either the object is humongous or the region isn't"); | |
3344 HeapWord* block = alloc_region->allocate(word_size); | |
3345 if (block == NULL) { | |
3346 block = allocate_during_gc_slow(purpose, alloc_region, false, word_size); | |
3347 } | |
3348 return block; | |
3349 } | |
3350 | |
3351 class G1IsAliveClosure: public BoolObjectClosure { | |
3352 G1CollectedHeap* _g1; | |
3353 public: | |
3354 G1IsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
3355 void do_object(oop p) { assert(false, "Do not call."); } | |
3356 bool do_object_b(oop p) { | |
3357 // It is reachable if it is outside the collection set, or is inside | |
3358 // and forwarded. | |
3359 | |
3360 #ifdef G1_DEBUG | |
3361 gclog_or_tty->print_cr("is alive "PTR_FORMAT" in CS %d forwarded %d overall %d", | |
3362 (void*) p, _g1->obj_in_cs(p), p->is_forwarded(), | |
3363 !_g1->obj_in_cs(p) || p->is_forwarded()); | |
3364 #endif // G1_DEBUG | |
3365 | |
3366 return !_g1->obj_in_cs(p) || p->is_forwarded(); | |
3367 } | |
3368 }; | |
3369 | |
3370 class G1KeepAliveClosure: public OopClosure { | |
3371 G1CollectedHeap* _g1; | |
3372 public: | |
3373 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
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3374 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
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3375 void do_oop( oop* p) { |
342 | 3376 oop obj = *p; |
3377 #ifdef G1_DEBUG | |
3378 if (PrintGC && Verbose) { | |
3379 gclog_or_tty->print_cr("keep alive *"PTR_FORMAT" = "PTR_FORMAT" "PTR_FORMAT, | |
3380 p, (void*) obj, (void*) *p); | |
3381 } | |
3382 #endif // G1_DEBUG | |
3383 | |
3384 if (_g1->obj_in_cs(obj)) { | |
3385 assert( obj->is_forwarded(), "invariant" ); | |
3386 *p = obj->forwardee(); | |
3387 #ifdef G1_DEBUG | |
3388 gclog_or_tty->print_cr(" in CSet: moved "PTR_FORMAT" -> "PTR_FORMAT, | |
3389 (void*) obj, (void*) *p); | |
3390 #endif // G1_DEBUG | |
3391 } | |
3392 } | |
3393 }; | |
3394 | |
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3395 class UpdateRSetDeferred : public OopsInHeapRegionClosure { |
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3396 private: |
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3397 G1CollectedHeap* _g1; |
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3398 DirtyCardQueue *_dcq; |
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3399 CardTableModRefBS* _ct_bs; |
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3400 |
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3401 public: |
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3402 UpdateRSetDeferred(G1CollectedHeap* g1, DirtyCardQueue* dcq) : |
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3403 _g1(g1), _ct_bs((CardTableModRefBS*)_g1->barrier_set()), _dcq(dcq) {} |
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3404 |
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3405 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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3406 virtual void do_oop( oop* p) { do_oop_work(p); } |
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3407 template <class T> void do_oop_work(T* p) { |
616
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3408 assert(_from->is_in_reserved(p), "paranoia"); |
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3409 if (!_from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && |
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3410 !_from->is_survivor()) { |
616
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3411 size_t card_index = _ct_bs->index_for(p); |
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3412 if (_ct_bs->mark_card_deferred(card_index)) { |
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3413 _dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index)); |
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3414 } |
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3415 } |
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3416 } |
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3417 }; |
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3418 |
342 | 3419 class RemoveSelfPointerClosure: public ObjectClosure { |
3420 private: | |
3421 G1CollectedHeap* _g1; | |
3422 ConcurrentMark* _cm; | |
3423 HeapRegion* _hr; | |
3424 size_t _prev_marked_bytes; | |
3425 size_t _next_marked_bytes; | |
616
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3426 OopsInHeapRegionClosure *_cl; |
342 | 3427 public: |
616
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3428 RemoveSelfPointerClosure(G1CollectedHeap* g1, OopsInHeapRegionClosure* cl) : |
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3429 _g1(g1), _cm(_g1->concurrent_mark()), _prev_marked_bytes(0), |
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3430 _next_marked_bytes(0), _cl(cl) {} |
342 | 3431 |
3432 size_t prev_marked_bytes() { return _prev_marked_bytes; } | |
3433 size_t next_marked_bytes() { return _next_marked_bytes; } | |
3434 | |
352
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3435 // The original idea here was to coalesce evacuated and dead objects. |
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3436 // However that caused complications with the block offset table (BOT). |
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3437 // In particular if there were two TLABs, one of them partially refined. |
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3438 // |----- TLAB_1--------|----TLAB_2-~~~(partially refined part)~~~| |
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3439 // The BOT entries of the unrefined part of TLAB_2 point to the start |
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3440 // of TLAB_2. If the last object of the TLAB_1 and the first object |
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3441 // of TLAB_2 are coalesced, then the cards of the unrefined part |
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3442 // would point into middle of the filler object. |
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3443 // |
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3444 // The current approach is to not coalesce and leave the BOT contents intact. |
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3445 void do_object(oop obj) { |
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3446 if (obj->is_forwarded() && obj->forwardee() == obj) { |
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3447 // The object failed to move. |
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3448 assert(!_g1->is_obj_dead(obj), "We should not be preserving dead objs."); |
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3449 _cm->markPrev(obj); |
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3450 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
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3451 _prev_marked_bytes += (obj->size() * HeapWordSize); |
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3452 if (_g1->mark_in_progress() && !_g1->is_obj_ill(obj)) { |
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3453 _cm->markAndGrayObjectIfNecessary(obj); |
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3454 } |
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3455 obj->set_mark(markOopDesc::prototype()); |
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3456 // While we were processing RSet buffers during the |
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3457 // collection, we actually didn't scan any cards on the |
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3458 // collection set, since we didn't want to update remebered |
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3459 // sets with entries that point into the collection set, given |
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3460 // that live objects fromthe collection set are about to move |
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3461 // and such entries will be stale very soon. This change also |
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3462 // dealt with a reliability issue which involved scanning a |
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3463 // card in the collection set and coming across an array that |
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3464 // was being chunked and looking malformed. The problem is |
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3465 // that, if evacuation fails, we might have remembered set |
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3466 // entries missing given that we skipped cards on the |
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3467 // collection set. So, we'll recreate such entries now. |
616
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3468 obj->oop_iterate(_cl); |
352
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3469 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
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3470 } else { |
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3471 // The object has been either evacuated or is dead. Fill it with a |
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3472 // dummy object. |
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3473 MemRegion mr((HeapWord*)obj, obj->size()); |
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3474 CollectedHeap::fill_with_object(mr); |
342 | 3475 _cm->clearRangeBothMaps(mr); |
3476 } | |
3477 } | |
3478 }; | |
3479 | |
3480 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
1705 | 3481 UpdateRSetImmediate immediate_update(_g1h->g1_rem_set()); |
616
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3482 DirtyCardQueue dcq(&_g1h->dirty_card_queue_set()); |
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3483 UpdateRSetDeferred deferred_update(_g1h, &dcq); |
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3484 OopsInHeapRegionClosure *cl; |
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3485 if (G1DeferredRSUpdate) { |
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3486 cl = &deferred_update; |
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3487 } else { |
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3488 cl = &immediate_update; |
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3489 } |
342 | 3490 HeapRegion* cur = g1_policy()->collection_set(); |
3491 while (cur != NULL) { | |
3492 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
3493 | |
616
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3494 RemoveSelfPointerClosure rspc(_g1h, cl); |
342 | 3495 if (cur->evacuation_failed()) { |
3496 assert(cur->in_collection_set(), "bad CS"); | |
616
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3497 cl->set_region(cur); |
342 | 3498 cur->object_iterate(&rspc); |
3499 | |
3500 // A number of manipulations to make the TAMS be the current top, | |
3501 // and the marked bytes be the ones observed in the iteration. | |
3502 if (_g1h->concurrent_mark()->at_least_one_mark_complete()) { | |
3503 // The comments below are the postconditions achieved by the | |
3504 // calls. Note especially the last such condition, which says that | |
3505 // the count of marked bytes has been properly restored. | |
3506 cur->note_start_of_marking(false); | |
3507 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
3508 cur->add_to_marked_bytes(rspc.prev_marked_bytes()); | |
3509 // _next_marked_bytes == prev_marked_bytes. | |
3510 cur->note_end_of_marking(); | |
3511 // _prev_top_at_mark_start == top(), | |
3512 // _prev_marked_bytes == prev_marked_bytes | |
3513 } | |
3514 // If there is no mark in progress, we modified the _next variables | |
3515 // above needlessly, but harmlessly. | |
3516 if (_g1h->mark_in_progress()) { | |
3517 cur->note_start_of_marking(false); | |
3518 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
3519 // _next_marked_bytes == next_marked_bytes. | |
3520 } | |
3521 | |
3522 // Now make sure the region has the right index in the sorted array. | |
3523 g1_policy()->note_change_in_marked_bytes(cur); | |
3524 } | |
3525 cur = cur->next_in_collection_set(); | |
3526 } | |
3527 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
3528 | |
3529 // Now restore saved marks, if any. | |
3530 if (_objs_with_preserved_marks != NULL) { | |
3531 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
3532 assert(_objs_with_preserved_marks->length() == | |
3533 _preserved_marks_of_objs->length(), "Both or none."); | |
3534 guarantee(_objs_with_preserved_marks->length() == | |
3535 _preserved_marks_of_objs->length(), "Both or none."); | |
3536 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
3537 oop obj = _objs_with_preserved_marks->at(i); | |
3538 markOop m = _preserved_marks_of_objs->at(i); | |
3539 obj->set_mark(m); | |
3540 } | |
3541 // Delete the preserved marks growable arrays (allocated on the C heap). | |
3542 delete _objs_with_preserved_marks; | |
3543 delete _preserved_marks_of_objs; | |
3544 _objs_with_preserved_marks = NULL; | |
3545 _preserved_marks_of_objs = NULL; | |
3546 } | |
3547 } | |
3548 | |
3549 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
3550 _evac_failure_scan_stack->push(obj); | |
3551 } | |
3552 | |
3553 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
3554 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
3555 | |
3556 while (_evac_failure_scan_stack->length() > 0) { | |
3557 oop obj = _evac_failure_scan_stack->pop(); | |
3558 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
3559 obj->oop_iterate_backwards(_evac_failure_closure); | |
3560 } | |
3561 } | |
3562 | |
3563 void G1CollectedHeap::handle_evacuation_failure(oop old) { | |
3564 markOop m = old->mark(); | |
3565 // forward to self | |
3566 assert(!old->is_forwarded(), "precondition"); | |
3567 | |
3568 old->forward_to(old); | |
3569 handle_evacuation_failure_common(old, m); | |
3570 } | |
3571 | |
3572 oop | |
3573 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
3574 oop old) { | |
3575 markOop m = old->mark(); | |
3576 oop forward_ptr = old->forward_to_atomic(old); | |
3577 if (forward_ptr == NULL) { | |
3578 // Forward-to-self succeeded. | |
3579 if (_evac_failure_closure != cl) { | |
3580 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
3581 assert(!_drain_in_progress, | |
3582 "Should only be true while someone holds the lock."); | |
3583 // Set the global evac-failure closure to the current thread's. | |
3584 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
3585 set_evac_failure_closure(cl); | |
3586 // Now do the common part. | |
3587 handle_evacuation_failure_common(old, m); | |
3588 // Reset to NULL. | |
3589 set_evac_failure_closure(NULL); | |
3590 } else { | |
3591 // The lock is already held, and this is recursive. | |
3592 assert(_drain_in_progress, "This should only be the recursive case."); | |
3593 handle_evacuation_failure_common(old, m); | |
3594 } | |
3595 return old; | |
3596 } else { | |
3597 // Someone else had a place to copy it. | |
3598 return forward_ptr; | |
3599 } | |
3600 } | |
3601 | |
3602 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
3603 set_evacuation_failed(true); | |
3604 | |
3605 preserve_mark_if_necessary(old, m); | |
3606 | |
3607 HeapRegion* r = heap_region_containing(old); | |
3608 if (!r->evacuation_failed()) { | |
3609 r->set_evacuation_failed(true); | |
1282 | 3610 if (G1PrintHeapRegions) { |
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3611 gclog_or_tty->print("overflow in heap region "PTR_FORMAT" " |
342 | 3612 "["PTR_FORMAT","PTR_FORMAT")\n", |
3613 r, r->bottom(), r->end()); | |
3614 } | |
3615 } | |
3616 | |
3617 push_on_evac_failure_scan_stack(old); | |
3618 | |
3619 if (!_drain_in_progress) { | |
3620 // prevent recursion in copy_to_survivor_space() | |
3621 _drain_in_progress = true; | |
3622 drain_evac_failure_scan_stack(); | |
3623 _drain_in_progress = false; | |
3624 } | |
3625 } | |
3626 | |
3627 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
3628 if (m != markOopDesc::prototype()) { | |
3629 if (_objs_with_preserved_marks == NULL) { | |
3630 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
3631 _objs_with_preserved_marks = | |
3632 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
3633 _preserved_marks_of_objs = | |
3634 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
3635 } | |
3636 _objs_with_preserved_marks->push(obj); | |
3637 _preserved_marks_of_objs->push(m); | |
3638 } | |
3639 } | |
3640 | |
3641 // *** Parallel G1 Evacuation | |
3642 | |
3643 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
3644 size_t word_size) { | |
1718
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3645 assert(!isHumongous(word_size), |
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3646 err_msg("we should not be seeing humongous allocation requests " |
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3647 "during GC, word_size = "SIZE_FORMAT, word_size)); |
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3648 |
342 | 3649 HeapRegion* alloc_region = _gc_alloc_regions[purpose]; |
3650 // let the caller handle alloc failure | |
3651 if (alloc_region == NULL) return NULL; | |
3652 | |
3653 HeapWord* block = alloc_region->par_allocate(word_size); | |
3654 if (block == NULL) { | |
3655 MutexLockerEx x(par_alloc_during_gc_lock(), | |
3656 Mutex::_no_safepoint_check_flag); | |
3657 block = allocate_during_gc_slow(purpose, alloc_region, true, word_size); | |
3658 } | |
3659 return block; | |
3660 } | |
3661 | |
545 | 3662 void G1CollectedHeap::retire_alloc_region(HeapRegion* alloc_region, |
3663 bool par) { | |
3664 // Another thread might have obtained alloc_region for the given | |
3665 // purpose, and might be attempting to allocate in it, and might | |
3666 // succeed. Therefore, we can't do the "finalization" stuff on the | |
3667 // region below until we're sure the last allocation has happened. | |
3668 // We ensure this by allocating the remaining space with a garbage | |
3669 // object. | |
3670 if (par) par_allocate_remaining_space(alloc_region); | |
3671 // Now we can do the post-GC stuff on the region. | |
3672 alloc_region->note_end_of_copying(); | |
3673 g1_policy()->record_after_bytes(alloc_region->used()); | |
3674 } | |
3675 | |
342 | 3676 HeapWord* |
3677 G1CollectedHeap::allocate_during_gc_slow(GCAllocPurpose purpose, | |
3678 HeapRegion* alloc_region, | |
3679 bool par, | |
3680 size_t word_size) { | |
1718
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3681 assert(!isHumongous(word_size), |
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3682 err_msg("we should not be seeing humongous allocation requests " |
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3683 "during GC, word_size = "SIZE_FORMAT, word_size)); |
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3684 |
342 | 3685 HeapWord* block = NULL; |
3686 // In the parallel case, a previous thread to obtain the lock may have | |
3687 // already assigned a new gc_alloc_region. | |
3688 if (alloc_region != _gc_alloc_regions[purpose]) { | |
3689 assert(par, "But should only happen in parallel case."); | |
3690 alloc_region = _gc_alloc_regions[purpose]; | |
3691 if (alloc_region == NULL) return NULL; | |
3692 block = alloc_region->par_allocate(word_size); | |
3693 if (block != NULL) return block; | |
3694 // Otherwise, continue; this new region is empty, too. | |
3695 } | |
3696 assert(alloc_region != NULL, "We better have an allocation region"); | |
545 | 3697 retire_alloc_region(alloc_region, par); |
342 | 3698 |
3699 if (_gc_alloc_region_counts[purpose] >= g1_policy()->max_regions(purpose)) { | |
3700 // Cannot allocate more regions for the given purpose. | |
3701 GCAllocPurpose alt_purpose = g1_policy()->alternative_purpose(purpose); | |
3702 // Is there an alternative? | |
3703 if (purpose != alt_purpose) { | |
3704 HeapRegion* alt_region = _gc_alloc_regions[alt_purpose]; | |
3705 // Has not the alternative region been aliased? | |
545 | 3706 if (alloc_region != alt_region && alt_region != NULL) { |
342 | 3707 // Try to allocate in the alternative region. |
3708 if (par) { | |
3709 block = alt_region->par_allocate(word_size); | |
3710 } else { | |
3711 block = alt_region->allocate(word_size); | |
3712 } | |
3713 // Make an alias. | |
3714 _gc_alloc_regions[purpose] = _gc_alloc_regions[alt_purpose]; | |
545 | 3715 if (block != NULL) { |
3716 return block; | |
3717 } | |
3718 retire_alloc_region(alt_region, par); | |
342 | 3719 } |
3720 // Both the allocation region and the alternative one are full | |
3721 // and aliased, replace them with a new allocation region. | |
3722 purpose = alt_purpose; | |
3723 } else { | |
3724 set_gc_alloc_region(purpose, NULL); | |
3725 return NULL; | |
3726 } | |
3727 } | |
3728 | |
3729 // Now allocate a new region for allocation. | |
3730 alloc_region = newAllocRegionWithExpansion(purpose, word_size, false /*zero_filled*/); | |
3731 | |
3732 // let the caller handle alloc failure | |
3733 if (alloc_region != NULL) { | |
3734 | |
3735 assert(check_gc_alloc_regions(), "alloc regions messed up"); | |
3736 assert(alloc_region->saved_mark_at_top(), | |
3737 "Mark should have been saved already."); | |
3738 // We used to assert that the region was zero-filled here, but no | |
3739 // longer. | |
3740 | |
3741 // This must be done last: once it's installed, other regions may | |
3742 // allocate in it (without holding the lock.) | |
3743 set_gc_alloc_region(purpose, alloc_region); | |
3744 | |
3745 if (par) { | |
3746 block = alloc_region->par_allocate(word_size); | |
3747 } else { | |
3748 block = alloc_region->allocate(word_size); | |
3749 } | |
3750 // Caller handles alloc failure. | |
3751 } else { | |
3752 // This sets other apis using the same old alloc region to NULL, also. | |
3753 set_gc_alloc_region(purpose, NULL); | |
3754 } | |
3755 return block; // May be NULL. | |
3756 } | |
3757 | |
3758 void G1CollectedHeap::par_allocate_remaining_space(HeapRegion* r) { | |
3759 HeapWord* block = NULL; | |
3760 size_t free_words; | |
3761 do { | |
3762 free_words = r->free()/HeapWordSize; | |
3763 // If there's too little space, no one can allocate, so we're done. | |
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3764 if (free_words < CollectedHeap::min_fill_size()) return; |
342 | 3765 // Otherwise, try to claim it. |
3766 block = r->par_allocate(free_words); | |
3767 } while (block == NULL); | |
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3768 fill_with_object(block, free_words); |
342 | 3769 } |
3770 | |
3771 #ifndef PRODUCT | |
3772 bool GCLabBitMapClosure::do_bit(size_t offset) { | |
3773 HeapWord* addr = _bitmap->offsetToHeapWord(offset); | |
3774 guarantee(_cm->isMarked(oop(addr)), "it should be!"); | |
3775 return true; | |
3776 } | |
3777 #endif // PRODUCT | |
3778 | |
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3779 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num) |
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3780 : _g1h(g1h), |
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3781 _refs(g1h->task_queue(queue_num)), |
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3782 _dcq(&g1h->dirty_card_queue_set()), |
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3783 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
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3784 _g1_rem(g1h->g1_rem_set()), |
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3785 _hash_seed(17), _queue_num(queue_num), |
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3786 _term_attempts(0), |
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3787 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)), |
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3788 _tenured_alloc_buffer(g1h->desired_plab_sz(GCAllocForTenured)), |
845
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3789 _age_table(false), |
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3790 _strong_roots_time(0), _term_time(0), |
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3791 _alloc_buffer_waste(0), _undo_waste(0) |
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3792 { |
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3793 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
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3794 // we "sacrifice" entry 0 to keep track of surviving bytes for |
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3795 // non-young regions (where the age is -1) |
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3796 // We also add a few elements at the beginning and at the end in |
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3797 // an attempt to eliminate cache contention |
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3798 size_t real_length = 1 + _g1h->g1_policy()->young_cset_length(); |
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3799 size_t array_length = PADDING_ELEM_NUM + |
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3800 real_length + |
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3801 PADDING_ELEM_NUM; |
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3802 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length); |
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3803 if (_surviving_young_words_base == NULL) |
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3804 vm_exit_out_of_memory(array_length * sizeof(size_t), |
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3805 "Not enough space for young surv histo."); |
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3806 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; |
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3807 memset(_surviving_young_words, 0, real_length * sizeof(size_t)); |
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3808 |
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3809 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer; |
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3810 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer; |
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3811 |
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3812 _start = os::elapsedTime(); |
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3813 } |
342 | 3814 |
1709 | 3815 void |
3816 G1ParScanThreadState::print_termination_stats_hdr(outputStream* const st) | |
3817 { | |
3818 st->print_raw_cr("GC Termination Stats"); | |
3819 st->print_raw_cr(" elapsed --strong roots-- -------termination-------" | |
3820 " ------waste (KiB)------"); | |
3821 st->print_raw_cr("thr ms ms % ms % attempts" | |
3822 " total alloc undo"); | |
3823 st->print_raw_cr("--- --------- --------- ------ --------- ------ --------" | |
3824 " ------- ------- -------"); | |
3825 } | |
3826 | |
3827 void | |
3828 G1ParScanThreadState::print_termination_stats(int i, | |
3829 outputStream* const st) const | |
3830 { | |
3831 const double elapsed_ms = elapsed_time() * 1000.0; | |
3832 const double s_roots_ms = strong_roots_time() * 1000.0; | |
3833 const double term_ms = term_time() * 1000.0; | |
3834 st->print_cr("%3d %9.2f %9.2f %6.2f " | |
3835 "%9.2f %6.2f " SIZE_FORMAT_W(8) " " | |
3836 SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7), | |
3837 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
3838 term_ms, term_ms * 100 / elapsed_ms, term_attempts(), | |
3839 (alloc_buffer_waste() + undo_waste()) * HeapWordSize / K, | |
3840 alloc_buffer_waste() * HeapWordSize / K, | |
3841 undo_waste() * HeapWordSize / K); | |
3842 } | |
3843 | |
342 | 3844 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : |
3845 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), | |
3846 _par_scan_state(par_scan_state) { } | |
3847 | |
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3848 template <class T> void G1ParCopyHelper::mark_forwardee(T* p) { |
342 | 3849 // This is called _after_ do_oop_work has been called, hence after |
3850 // the object has been relocated to its new location and *p points | |
3851 // to its new location. | |
3852 | |
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3853 T heap_oop = oopDesc::load_heap_oop(p); |
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3854 if (!oopDesc::is_null(heap_oop)) { |
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3855 oop obj = oopDesc::decode_heap_oop(heap_oop); |
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3856 assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj)), |
342 | 3857 "shouldn't still be in the CSet if evacuation didn't fail."); |
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3858 HeapWord* addr = (HeapWord*)obj; |
342 | 3859 if (_g1->is_in_g1_reserved(addr)) |
3860 _cm->grayRoot(oop(addr)); | |
3861 } | |
3862 } | |
3863 | |
3864 oop G1ParCopyHelper::copy_to_survivor_space(oop old) { | |
3865 size_t word_sz = old->size(); | |
3866 HeapRegion* from_region = _g1->heap_region_containing_raw(old); | |
3867 // +1 to make the -1 indexes valid... | |
3868 int young_index = from_region->young_index_in_cset()+1; | |
3869 assert( (from_region->is_young() && young_index > 0) || | |
3870 (!from_region->is_young() && young_index == 0), "invariant" ); | |
3871 G1CollectorPolicy* g1p = _g1->g1_policy(); | |
3872 markOop m = old->mark(); | |
545 | 3873 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
3874 : m->age(); | |
3875 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
342 | 3876 word_sz); |
3877 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
3878 oop obj = oop(obj_ptr); | |
3879 | |
3880 if (obj_ptr == NULL) { | |
3881 // This will either forward-to-self, or detect that someone else has | |
3882 // installed a forwarding pointer. | |
3883 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
3884 return _g1->handle_evacuation_failure_par(cl, old); | |
3885 } | |
3886 | |
526 | 3887 // We're going to allocate linearly, so might as well prefetch ahead. |
3888 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
3889 | |
342 | 3890 oop forward_ptr = old->forward_to_atomic(obj); |
3891 if (forward_ptr == NULL) { | |
3892 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
526 | 3893 if (g1p->track_object_age(alloc_purpose)) { |
3894 // We could simply do obj->incr_age(). However, this causes a | |
3895 // performance issue. obj->incr_age() will first check whether | |
3896 // the object has a displaced mark by checking its mark word; | |
3897 // getting the mark word from the new location of the object | |
3898 // stalls. So, given that we already have the mark word and we | |
3899 // are about to install it anyway, it's better to increase the | |
3900 // age on the mark word, when the object does not have a | |
3901 // displaced mark word. We're not expecting many objects to have | |
3902 // a displaced marked word, so that case is not optimized | |
3903 // further (it could be...) and we simply call obj->incr_age(). | |
3904 | |
3905 if (m->has_displaced_mark_helper()) { | |
3906 // in this case, we have to install the mark word first, | |
3907 // otherwise obj looks to be forwarded (the old mark word, | |
3908 // which contains the forward pointer, was copied) | |
3909 obj->set_mark(m); | |
3910 obj->incr_age(); | |
3911 } else { | |
3912 m = m->incr_age(); | |
545 | 3913 obj->set_mark(m); |
526 | 3914 } |
545 | 3915 _par_scan_state->age_table()->add(obj, word_sz); |
3916 } else { | |
3917 obj->set_mark(m); | |
526 | 3918 } |
3919 | |
342 | 3920 // preserve "next" mark bit |
3921 if (_g1->mark_in_progress() && !_g1->is_obj_ill(old)) { | |
3922 if (!use_local_bitmaps || | |
3923 !_par_scan_state->alloc_buffer(alloc_purpose)->mark(obj_ptr)) { | |
3924 // if we couldn't mark it on the local bitmap (this happens when | |
3925 // the object was not allocated in the GCLab), we have to bite | |
3926 // the bullet and do the standard parallel mark | |
3927 _cm->markAndGrayObjectIfNecessary(obj); | |
3928 } | |
3929 #if 1 | |
3930 if (_g1->isMarkedNext(old)) { | |
3931 _cm->nextMarkBitMap()->parClear((HeapWord*)old); | |
3932 } | |
3933 #endif | |
3934 } | |
3935 | |
3936 size_t* surv_young_words = _par_scan_state->surviving_young_words(); | |
3937 surv_young_words[young_index] += word_sz; | |
3938 | |
3939 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
3940 arrayOop(old)->set_length(0); | |
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3941 oop* old_p = set_partial_array_mask(old); |
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3942 _par_scan_state->push_on_queue(old_p); |
342 | 3943 } else { |
526 | 3944 // No point in using the slower heap_region_containing() method, |
3945 // given that we know obj is in the heap. | |
3946 _scanner->set_region(_g1->heap_region_containing_raw(obj)); | |
342 | 3947 obj->oop_iterate_backwards(_scanner); |
3948 } | |
3949 } else { | |
3950 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
3951 obj = forward_ptr; | |
3952 } | |
3953 return obj; | |
3954 } | |
3955 | |
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3956 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_forwardee> |
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3957 template <class T> |
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3958 void G1ParCopyClosure <do_gen_barrier, barrier, do_mark_forwardee> |
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3959 ::do_oop_work(T* p) { |
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3960 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 3961 assert(barrier != G1BarrierRS || obj != NULL, |
3962 "Precondition: G1BarrierRS implies obj is nonNull"); | |
3963 | |
526 | 3964 // here the null check is implicit in the cset_fast_test() test |
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3965 if (_g1->in_cset_fast_test(obj)) { |
342 | 3966 #if G1_REM_SET_LOGGING |
526 | 3967 gclog_or_tty->print_cr("Loc "PTR_FORMAT" contains pointer "PTR_FORMAT" " |
3968 "into CS.", p, (void*) obj); | |
342 | 3969 #endif |
526 | 3970 if (obj->is_forwarded()) { |
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3971 oopDesc::encode_store_heap_oop(p, obj->forwardee()); |
526 | 3972 } else { |
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3973 oop copy_oop = copy_to_survivor_space(obj); |
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3974 oopDesc::encode_store_heap_oop(p, copy_oop); |
342 | 3975 } |
526 | 3976 // When scanning the RS, we only care about objs in CS. |
3977 if (barrier == G1BarrierRS) { | |
616
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3978 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
342 | 3979 } |
526 | 3980 } |
3981 | |
3982 if (barrier == G1BarrierEvac && obj != NULL) { | |
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3983 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
526 | 3984 } |
3985 | |
3986 if (do_gen_barrier && obj != NULL) { | |
3987 par_do_barrier(p); | |
3988 } | |
3989 } | |
3990 | |
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3991 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(oop* p); |
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3992 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(narrowOop* p); |
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3993 |
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3994 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
526 | 3995 assert(has_partial_array_mask(p), "invariant"); |
3996 oop old = clear_partial_array_mask(p); | |
342 | 3997 assert(old->is_objArray(), "must be obj array"); |
3998 assert(old->is_forwarded(), "must be forwarded"); | |
3999 assert(Universe::heap()->is_in_reserved(old), "must be in heap."); | |
4000 | |
4001 objArrayOop obj = objArrayOop(old->forwardee()); | |
4002 assert((void*)old != (void*)old->forwardee(), "self forwarding here?"); | |
4003 // Process ParGCArrayScanChunk elements now | |
4004 // and push the remainder back onto queue | |
4005 int start = arrayOop(old)->length(); | |
4006 int end = obj->length(); | |
4007 int remainder = end - start; | |
4008 assert(start <= end, "just checking"); | |
4009 if (remainder > 2 * ParGCArrayScanChunk) { | |
4010 // Test above combines last partial chunk with a full chunk | |
4011 end = start + ParGCArrayScanChunk; | |
4012 arrayOop(old)->set_length(end); | |
4013 // Push remainder. | |
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4014 oop* old_p = set_partial_array_mask(old); |
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4015 assert(arrayOop(old)->length() < obj->length(), "Empty push?"); |
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4016 _par_scan_state->push_on_queue(old_p); |
342 | 4017 } else { |
4018 // Restore length so that the heap remains parsable in | |
4019 // case of evacuation failure. | |
4020 arrayOop(old)->set_length(end); | |
4021 } | |
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4022 _scanner.set_region(_g1->heap_region_containing_raw(obj)); |
342 | 4023 // process our set of indices (include header in first chunk) |
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4024 obj->oop_iterate_range(&_scanner, start, end); |
342 | 4025 } |
4026 | |
4027 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
4028 protected: | |
4029 G1CollectedHeap* _g1h; | |
4030 G1ParScanThreadState* _par_scan_state; | |
4031 RefToScanQueueSet* _queues; | |
4032 ParallelTaskTerminator* _terminator; | |
4033 | |
4034 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
4035 RefToScanQueueSet* queues() { return _queues; } | |
4036 ParallelTaskTerminator* terminator() { return _terminator; } | |
4037 | |
4038 public: | |
4039 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
4040 G1ParScanThreadState* par_scan_state, | |
4041 RefToScanQueueSet* queues, | |
4042 ParallelTaskTerminator* terminator) | |
4043 : _g1h(g1h), _par_scan_state(par_scan_state), | |
4044 _queues(queues), _terminator(terminator) {} | |
4045 | |
4046 void do_void() { | |
4047 G1ParScanThreadState* pss = par_scan_state(); | |
4048 while (true) { | |
4049 pss->trim_queue(); | |
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4050 |
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4051 StarTask stolen_task; |
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4052 if (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
526 | 4053 // slightly paranoid tests; I'm trying to catch potential |
4054 // problems before we go into push_on_queue to know where the | |
4055 // problem is coming from | |
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4056 assert((oop*)stolen_task != NULL, "Error"); |
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4057 if (stolen_task.is_narrow()) { |
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4058 assert(UseCompressedOops, "Error"); |
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4059 narrowOop* p = (narrowOop*) stolen_task; |
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4060 assert(has_partial_array_mask(p) || |
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4061 _g1h->is_in_g1_reserved(oopDesc::load_decode_heap_oop(p)), "Error"); |
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4062 pss->push_on_queue(p); |
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4063 } else { |
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4064 oop* p = (oop*) stolen_task; |
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4065 assert(has_partial_array_mask(p) || _g1h->is_in_g1_reserved(*p), "Error"); |
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4066 pss->push_on_queue(p); |
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4067 } |
342 | 4068 continue; |
4069 } | |
4070 pss->start_term_time(); | |
4071 if (terminator()->offer_termination()) break; | |
4072 pss->end_term_time(); | |
4073 } | |
4074 pss->end_term_time(); | |
4075 pss->retire_alloc_buffers(); | |
4076 } | |
4077 }; | |
4078 | |
4079 class G1ParTask : public AbstractGangTask { | |
4080 protected: | |
4081 G1CollectedHeap* _g1h; | |
4082 RefToScanQueueSet *_queues; | |
4083 ParallelTaskTerminator _terminator; | |
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4084 int _n_workers; |
342 | 4085 |
4086 Mutex _stats_lock; | |
4087 Mutex* stats_lock() { return &_stats_lock; } | |
4088 | |
4089 size_t getNCards() { | |
4090 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
4091 / G1BlockOffsetSharedArray::N_bytes; | |
4092 } | |
4093 | |
4094 public: | |
4095 G1ParTask(G1CollectedHeap* g1h, int workers, RefToScanQueueSet *task_queues) | |
4096 : AbstractGangTask("G1 collection"), | |
4097 _g1h(g1h), | |
4098 _queues(task_queues), | |
4099 _terminator(workers, _queues), | |
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4100 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true), |
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4101 _n_workers(workers) |
342 | 4102 {} |
4103 | |
4104 RefToScanQueueSet* queues() { return _queues; } | |
4105 | |
4106 RefToScanQueue *work_queue(int i) { | |
4107 return queues()->queue(i); | |
4108 } | |
4109 | |
4110 void work(int i) { | |
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4111 if (i >= _n_workers) return; // no work needed this round |
1611 | 4112 |
4113 double start_time_ms = os::elapsedTime() * 1000.0; | |
4114 _g1h->g1_policy()->record_gc_worker_start_time(i, start_time_ms); | |
4115 | |
342 | 4116 ResourceMark rm; |
4117 HandleMark hm; | |
4118 | |
526 | 4119 G1ParScanThreadState pss(_g1h, i); |
4120 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss); | |
4121 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss); | |
4122 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss); | |
342 | 4123 |
4124 pss.set_evac_closure(&scan_evac_cl); | |
4125 pss.set_evac_failure_closure(&evac_failure_cl); | |
4126 pss.set_partial_scan_closure(&partial_scan_cl); | |
4127 | |
4128 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss); | |
4129 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss); | |
4130 G1ParScanHeapRSClosure only_scan_heap_rs_cl(_g1h, &pss); | |
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4131 G1ParPushHeapRSClosure push_heap_rs_cl(_g1h, &pss); |
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4132 |
342 | 4133 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss); |
4134 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss); | |
4135 G1ParScanAndMarkHeapRSClosure scan_mark_heap_rs_cl(_g1h, &pss); | |
4136 | |
4137 OopsInHeapRegionClosure *scan_root_cl; | |
4138 OopsInHeapRegionClosure *scan_perm_cl; | |
4139 | |
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4140 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
342 | 4141 scan_root_cl = &scan_mark_root_cl; |
4142 scan_perm_cl = &scan_mark_perm_cl; | |
4143 } else { | |
4144 scan_root_cl = &only_scan_root_cl; | |
4145 scan_perm_cl = &only_scan_perm_cl; | |
4146 } | |
4147 | |
4148 pss.start_strong_roots(); | |
4149 _g1h->g1_process_strong_roots(/* not collecting perm */ false, | |
4150 SharedHeap::SO_AllClasses, | |
4151 scan_root_cl, | |
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4152 &push_heap_rs_cl, |
342 | 4153 scan_perm_cl, |
4154 i); | |
4155 pss.end_strong_roots(); | |
4156 { | |
4157 double start = os::elapsedTime(); | |
4158 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); | |
4159 evac.do_void(); | |
4160 double elapsed_ms = (os::elapsedTime()-start)*1000.0; | |
4161 double term_ms = pss.term_time()*1000.0; | |
4162 _g1h->g1_policy()->record_obj_copy_time(i, elapsed_ms-term_ms); | |
1611 | 4163 _g1h->g1_policy()->record_termination(i, term_ms, pss.term_attempts()); |
342 | 4164 } |
1282 | 4165 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
342 | 4166 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
4167 | |
4168 // Clean up any par-expanded rem sets. | |
4169 HeapRegionRemSet::par_cleanup(); | |
4170 | |
4171 if (ParallelGCVerbose) { | |
1709 | 4172 MutexLocker x(stats_lock()); |
4173 pss.print_termination_stats(i); | |
342 | 4174 } |
4175 | |
4176 assert(pss.refs_to_scan() == 0, "Task queue should be empty"); | |
4177 assert(pss.overflowed_refs_to_scan() == 0, "Overflow queue should be empty"); | |
1611 | 4178 double end_time_ms = os::elapsedTime() * 1000.0; |
4179 _g1h->g1_policy()->record_gc_worker_end_time(i, end_time_ms); | |
342 | 4180 } |
4181 }; | |
4182 | |
4183 // *** Common G1 Evacuation Stuff | |
4184 | |
4185 void | |
4186 G1CollectedHeap:: | |
4187 g1_process_strong_roots(bool collecting_perm_gen, | |
4188 SharedHeap::ScanningOption so, | |
4189 OopClosure* scan_non_heap_roots, | |
4190 OopsInHeapRegionClosure* scan_rs, | |
4191 OopsInGenClosure* scan_perm, | |
4192 int worker_i) { | |
4193 // First scan the strong roots, including the perm gen. | |
4194 double ext_roots_start = os::elapsedTime(); | |
4195 double closure_app_time_sec = 0.0; | |
4196 | |
4197 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
4198 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
4199 buf_scan_perm.set_generation(perm_gen()); | |
4200 | |
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4201 // Walk the code cache w/o buffering, because StarTask cannot handle |
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4202 // unaligned oop locations. |
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4203 CodeBlobToOopClosure eager_scan_code_roots(scan_non_heap_roots, /*do_marking=*/ true); |
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4204 |
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4205 process_strong_roots(false, // no scoping; this is parallel code |
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4206 collecting_perm_gen, so, |
342 | 4207 &buf_scan_non_heap_roots, |
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4208 &eager_scan_code_roots, |
342 | 4209 &buf_scan_perm); |
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4210 |
342 | 4211 // Finish up any enqueued closure apps. |
4212 buf_scan_non_heap_roots.done(); | |
4213 buf_scan_perm.done(); | |
4214 double ext_roots_end = os::elapsedTime(); | |
4215 g1_policy()->reset_obj_copy_time(worker_i); | |
4216 double obj_copy_time_sec = | |
4217 buf_scan_non_heap_roots.closure_app_seconds() + | |
4218 buf_scan_perm.closure_app_seconds(); | |
4219 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); | |
4220 double ext_root_time_ms = | |
4221 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
4222 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); | |
4223 | |
4224 // Scan strong roots in mark stack. | |
4225 if (!_process_strong_tasks->is_task_claimed(G1H_PS_mark_stack_oops_do)) { | |
4226 concurrent_mark()->oops_do(scan_non_heap_roots); | |
4227 } | |
4228 double mark_stack_scan_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; | |
4229 g1_policy()->record_mark_stack_scan_time(worker_i, mark_stack_scan_ms); | |
4230 | |
4231 // XXX What should this be doing in the parallel case? | |
4232 g1_policy()->record_collection_pause_end_CH_strong_roots(); | |
4233 // Now scan the complement of the collection set. | |
4234 if (scan_rs != NULL) { | |
4235 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
4236 } | |
4237 // Finish with the ref_processor roots. | |
4238 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { | |
4239 ref_processor()->oops_do(scan_non_heap_roots); | |
4240 } | |
4241 g1_policy()->record_collection_pause_end_G1_strong_roots(); | |
4242 _process_strong_tasks->all_tasks_completed(); | |
4243 } | |
4244 | |
4245 void | |
4246 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
4247 OopClosure* non_root_closure) { | |
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4248 CodeBlobToOopClosure roots_in_blobs(root_closure, /*do_marking=*/ false); |
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4249 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs, non_root_closure); |
342 | 4250 } |
4251 | |
4252 | |
4253 class SaveMarksClosure: public HeapRegionClosure { | |
4254 public: | |
4255 bool doHeapRegion(HeapRegion* r) { | |
4256 r->save_marks(); | |
4257 return false; | |
4258 } | |
4259 }; | |
4260 | |
4261 void G1CollectedHeap::save_marks() { | |
4262 if (ParallelGCThreads == 0) { | |
4263 SaveMarksClosure sm; | |
4264 heap_region_iterate(&sm); | |
4265 } | |
4266 // We do this even in the parallel case | |
4267 perm_gen()->save_marks(); | |
4268 } | |
4269 | |
4270 void G1CollectedHeap::evacuate_collection_set() { | |
4271 set_evacuation_failed(false); | |
4272 | |
4273 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
4274 concurrent_g1_refine()->set_use_cache(false); | |
889 | 4275 concurrent_g1_refine()->clear_hot_cache_claimed_index(); |
4276 | |
342 | 4277 int n_workers = (ParallelGCThreads > 0 ? workers()->total_workers() : 1); |
4278 set_par_threads(n_workers); | |
4279 G1ParTask g1_par_task(this, n_workers, _task_queues); | |
4280 | |
4281 init_for_evac_failure(NULL); | |
4282 | |
4283 rem_set()->prepare_for_younger_refs_iterate(true); | |
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4284 |
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4285 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
342 | 4286 double start_par = os::elapsedTime(); |
4287 if (ParallelGCThreads > 0) { | |
4288 // The individual threads will set their evac-failure closures. | |
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4289 StrongRootsScope srs(this); |
1709 | 4290 if (ParallelGCVerbose) G1ParScanThreadState::print_termination_stats_hdr(); |
342 | 4291 workers()->run_task(&g1_par_task); |
4292 } else { | |
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4293 StrongRootsScope srs(this); |
342 | 4294 g1_par_task.work(0); |
4295 } | |
4296 | |
4297 double par_time = (os::elapsedTime() - start_par) * 1000.0; | |
4298 g1_policy()->record_par_time(par_time); | |
4299 set_par_threads(0); | |
4300 // Is this the right thing to do here? We don't save marks | |
4301 // on individual heap regions when we allocate from | |
4302 // them in parallel, so this seems like the correct place for this. | |
545 | 4303 retire_all_alloc_regions(); |
342 | 4304 { |
4305 G1IsAliveClosure is_alive(this); | |
4306 G1KeepAliveClosure keep_alive(this); | |
4307 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
4308 } | |
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4309 release_gc_alloc_regions(false /* totally */); |
342 | 4310 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); |
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4311 |
889 | 4312 concurrent_g1_refine()->clear_hot_cache(); |
342 | 4313 concurrent_g1_refine()->set_use_cache(true); |
4314 | |
4315 finalize_for_evac_failure(); | |
4316 | |
4317 // Must do this before removing self-forwarding pointers, which clears | |
4318 // the per-region evac-failure flags. | |
4319 concurrent_mark()->complete_marking_in_collection_set(); | |
4320 | |
4321 if (evacuation_failed()) { | |
4322 remove_self_forwarding_pointers(); | |
4323 if (PrintGCDetails) { | |
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4324 gclog_or_tty->print(" (to-space overflow)"); |
342 | 4325 } else if (PrintGC) { |
4326 gclog_or_tty->print("--"); | |
4327 } | |
4328 } | |
4329 | |
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4330 if (G1DeferredRSUpdate) { |
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4331 RedirtyLoggedCardTableEntryFastClosure redirty; |
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4332 dirty_card_queue_set().set_closure(&redirty); |
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4333 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
1111 | 4334 |
4335 DirtyCardQueueSet& dcq = JavaThread::dirty_card_queue_set(); | |
4336 dcq.merge_bufferlists(&dirty_card_queue_set()); | |
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4337 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
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4338 } |
342 | 4339 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
4340 } | |
4341 | |
4342 void G1CollectedHeap::free_region(HeapRegion* hr) { | |
4343 size_t pre_used = 0; | |
4344 size_t cleared_h_regions = 0; | |
4345 size_t freed_regions = 0; | |
4346 UncleanRegionList local_list; | |
4347 | |
4348 HeapWord* start = hr->bottom(); | |
4349 HeapWord* end = hr->prev_top_at_mark_start(); | |
4350 size_t used_bytes = hr->used(); | |
4351 size_t live_bytes = hr->max_live_bytes(); | |
4352 if (used_bytes > 0) { | |
4353 guarantee( live_bytes <= used_bytes, "invariant" ); | |
4354 } else { | |
4355 guarantee( live_bytes == 0, "invariant" ); | |
4356 } | |
4357 | |
4358 size_t garbage_bytes = used_bytes - live_bytes; | |
4359 if (garbage_bytes > 0) | |
4360 g1_policy()->decrease_known_garbage_bytes(garbage_bytes); | |
4361 | |
4362 free_region_work(hr, pre_used, cleared_h_regions, freed_regions, | |
4363 &local_list); | |
4364 finish_free_region_work(pre_used, cleared_h_regions, freed_regions, | |
4365 &local_list); | |
4366 } | |
4367 | |
4368 void | |
4369 G1CollectedHeap::free_region_work(HeapRegion* hr, | |
4370 size_t& pre_used, | |
4371 size_t& cleared_h_regions, | |
4372 size_t& freed_regions, | |
4373 UncleanRegionList* list, | |
4374 bool par) { | |
4375 pre_used += hr->used(); | |
4376 if (hr->isHumongous()) { | |
4377 assert(hr->startsHumongous(), | |
4378 "Only the start of a humongous region should be freed."); | |
4379 int ind = _hrs->find(hr); | |
4380 assert(ind != -1, "Should have an index."); | |
4381 // Clear the start region. | |
4382 hr->hr_clear(par, true /*clear_space*/); | |
4383 list->insert_before_head(hr); | |
4384 cleared_h_regions++; | |
4385 freed_regions++; | |
4386 // Clear any continued regions. | |
4387 ind++; | |
4388 while ((size_t)ind < n_regions()) { | |
4389 HeapRegion* hrc = _hrs->at(ind); | |
4390 if (!hrc->continuesHumongous()) break; | |
4391 // Otherwise, does continue the H region. | |
4392 assert(hrc->humongous_start_region() == hr, "Huh?"); | |
4393 hrc->hr_clear(par, true /*clear_space*/); | |
4394 cleared_h_regions++; | |
4395 freed_regions++; | |
4396 list->insert_before_head(hrc); | |
4397 ind++; | |
4398 } | |
4399 } else { | |
4400 hr->hr_clear(par, true /*clear_space*/); | |
4401 list->insert_before_head(hr); | |
4402 freed_regions++; | |
4403 // If we're using clear2, this should not be enabled. | |
4404 // assert(!hr->in_cohort(), "Can't be both free and in a cohort."); | |
4405 } | |
4406 } | |
4407 | |
4408 void G1CollectedHeap::finish_free_region_work(size_t pre_used, | |
4409 size_t cleared_h_regions, | |
4410 size_t freed_regions, | |
4411 UncleanRegionList* list) { | |
4412 if (list != NULL && list->sz() > 0) { | |
4413 prepend_region_list_on_unclean_list(list); | |
4414 } | |
4415 // Acquire a lock, if we're parallel, to update possibly-shared | |
4416 // variables. | |
4417 Mutex* lock = (n_par_threads() > 0) ? ParGCRareEvent_lock : NULL; | |
4418 { | |
4419 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); | |
4420 _summary_bytes_used -= pre_used; | |
4421 _num_humongous_regions -= (int) cleared_h_regions; | |
4422 _free_regions += freed_regions; | |
4423 } | |
4424 } | |
4425 | |
4426 | |
4427 void G1CollectedHeap::dirtyCardsForYoungRegions(CardTableModRefBS* ct_bs, HeapRegion* list) { | |
4428 while (list != NULL) { | |
4429 guarantee( list->is_young(), "invariant" ); | |
4430 | |
4431 HeapWord* bottom = list->bottom(); | |
4432 HeapWord* end = list->end(); | |
4433 MemRegion mr(bottom, end); | |
4434 ct_bs->dirty(mr); | |
4435 | |
4436 list = list->get_next_young_region(); | |
4437 } | |
4438 } | |
4439 | |
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4440 |
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4441 class G1ParCleanupCTTask : public AbstractGangTask { |
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4442 CardTableModRefBS* _ct_bs; |
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4443 G1CollectedHeap* _g1h; |
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4444 HeapRegion* volatile _su_head; |
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4445 public: |
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4446 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
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4447 G1CollectedHeap* g1h, |
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4448 HeapRegion* survivor_list) : |
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4449 AbstractGangTask("G1 Par Cleanup CT Task"), |
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4450 _ct_bs(ct_bs), |
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4451 _g1h(g1h), |
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4452 _su_head(survivor_list) |
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4453 { } |
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4454 |
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4455 void work(int i) { |
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4456 HeapRegion* r; |
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4457 while (r = _g1h->pop_dirty_cards_region()) { |
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4458 clear_cards(r); |
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4459 } |
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4460 // Redirty the cards of the survivor regions. |
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|
4461 dirty_list(&this->_su_head); |
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|
4462 } |
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|
4463 |
796
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|
4464 void clear_cards(HeapRegion* r) { |
1394
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4465 // Cards for Survivor regions will be dirtied later. |
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|
4466 if (!r->is_survivor()) { |
796
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4467 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
29e7d79232b9
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|
4468 } |
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|
4469 } |
940
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|
4470 |
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|
4471 void dirty_list(HeapRegion* volatile * head_ptr) { |
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|
4472 HeapRegion* head; |
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|
4473 do { |
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|
4474 // Pop region off the list. |
8624da129f0b
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|
4475 head = *head_ptr; |
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|
4476 if (head != NULL) { |
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|
4477 HeapRegion* r = (HeapRegion*) |
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4478 Atomic::cmpxchg_ptr(head->get_next_young_region(), head_ptr, head); |
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4479 if (r == head) { |
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4480 assert(!r->isHumongous(), "Humongous regions shouldn't be on survivor list"); |
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4481 _ct_bs->dirty(MemRegion(r->bottom(), r->end())); |
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|
4482 } |
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|
4483 } |
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|
4484 } while (*head_ptr != NULL); |
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|
4485 } |
796
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|
4486 }; |
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|
4487 |
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|
4488 |
940
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|
4489 #ifndef PRODUCT |
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4490 class G1VerifyCardTableCleanup: public HeapRegionClosure { |
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4491 CardTableModRefBS* _ct_bs; |
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|
4492 public: |
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|
4493 G1VerifyCardTableCleanup(CardTableModRefBS* ct_bs) |
8624da129f0b
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|
4494 : _ct_bs(ct_bs) |
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|
4495 { } |
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|
4496 virtual bool doHeapRegion(HeapRegion* r) |
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|
4497 { |
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|
4498 MemRegion mr(r->bottom(), r->end()); |
1394
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4499 if (r->is_survivor()) { |
940
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4500 _ct_bs->verify_dirty_region(mr); |
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|
4501 } else { |
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|
4502 _ct_bs->verify_clean_region(mr); |
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|
4503 } |
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|
4504 return false; |
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|
4505 } |
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|
4506 }; |
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|
4507 #endif |
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|
4508 |
342 | 4509 void G1CollectedHeap::cleanUpCardTable() { |
4510 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
4511 double start = os::elapsedTime(); | |
4512 | |
796
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|
4513 // Iterate over the dirty cards region list. |
940
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|
4514 G1ParCleanupCTTask cleanup_task(ct_bs, this, |
8624da129f0b
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|
4515 _young_list->first_survivor_region()); |
1394
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|
4516 |
796
29e7d79232b9
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|
4517 if (ParallelGCThreads > 0) { |
29e7d79232b9
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|
4518 set_par_threads(workers()->total_workers()); |
29e7d79232b9
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|
4519 workers()->run_task(&cleanup_task); |
29e7d79232b9
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|
4520 set_par_threads(0); |
29e7d79232b9
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|
4521 } else { |
29e7d79232b9
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|
4522 while (_dirty_cards_region_list) { |
29e7d79232b9
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|
4523 HeapRegion* r = _dirty_cards_region_list; |
29e7d79232b9
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|
4524 cleanup_task.clear_cards(r); |
29e7d79232b9
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|
4525 _dirty_cards_region_list = r->get_next_dirty_cards_region(); |
29e7d79232b9
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|
4526 if (_dirty_cards_region_list == r) { |
29e7d79232b9
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|
4527 // The last region. |
29e7d79232b9
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|
4528 _dirty_cards_region_list = NULL; |
29e7d79232b9
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|
4529 } |
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|
4530 r->set_next_dirty_cards_region(NULL); |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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|
4531 } |
1394
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|
4532 // now, redirty the cards of the survivor regions |
940
8624da129f0b
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|
4533 // (it seemed faster to do it this way, instead of iterating over |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
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|
4534 // all regions and then clearing / dirtying as appropriate) |
8624da129f0b
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|
4535 dirtyCardsForYoungRegions(ct_bs, _young_list->first_survivor_region()); |
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|
4536 } |
1394
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|
4537 |
342 | 4538 double elapsed = os::elapsedTime() - start; |
4539 g1_policy()->record_clear_ct_time( elapsed * 1000.0); | |
940
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|
4540 #ifndef PRODUCT |
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diff
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|
4541 if (G1VerifyCTCleanup || VerifyAfterGC) { |
8624da129f0b
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|
4542 G1VerifyCardTableCleanup cleanup_verifier(ct_bs); |
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|
4543 heap_region_iterate(&cleanup_verifier); |
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6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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|
4544 } |
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|
4545 #endif |
342 | 4546 } |
4547 | |
4548 void G1CollectedHeap::do_collection_pause_if_appropriate(size_t word_size) { | |
4549 if (g1_policy()->should_do_collection_pause(word_size)) { | |
4550 do_collection_pause(); | |
4551 } | |
4552 } | |
4553 | |
4554 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
4555 double young_time_ms = 0.0; | |
4556 double non_young_time_ms = 0.0; | |
4557 | |
1394
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
4558 // 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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|
4559 // 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
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diff
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|
4560 // head and length, and unlink any young regions in the code below |
1316cec51b4d
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|
4561 _young_list->clear(); |
1316cec51b4d
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changeset
|
4562 |
342 | 4563 G1CollectorPolicy* policy = g1_policy(); |
4564 | |
4565 double start_sec = os::elapsedTime(); | |
4566 bool non_young = true; | |
4567 | |
4568 HeapRegion* cur = cs_head; | |
4569 int age_bound = -1; | |
4570 size_t rs_lengths = 0; | |
4571 | |
4572 while (cur != NULL) { | |
4573 if (non_young) { | |
4574 if (cur->is_young()) { | |
4575 double end_sec = os::elapsedTime(); | |
4576 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
4577 non_young_time_ms += elapsed_ms; | |
4578 | |
4579 start_sec = os::elapsedTime(); | |
4580 non_young = false; | |
4581 } | |
4582 } else { | |
4583 if (!cur->is_on_free_list()) { | |
4584 double end_sec = os::elapsedTime(); | |
4585 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
4586 young_time_ms += elapsed_ms; | |
4587 | |
4588 start_sec = os::elapsedTime(); | |
4589 non_young = true; | |
4590 } | |
4591 } | |
4592 | |
4593 rs_lengths += cur->rem_set()->occupied(); | |
4594 | |
4595 HeapRegion* next = cur->next_in_collection_set(); | |
4596 assert(cur->in_collection_set(), "bad CS"); | |
4597 cur->set_next_in_collection_set(NULL); | |
4598 cur->set_in_collection_set(false); | |
4599 | |
4600 if (cur->is_young()) { | |
4601 int index = cur->young_index_in_cset(); | |
4602 guarantee( index != -1, "invariant" ); | |
4603 guarantee( (size_t)index < policy->young_cset_length(), "invariant" ); | |
4604 size_t words_survived = _surviving_young_words[index]; | |
4605 cur->record_surv_words_in_group(words_survived); | |
1394
1316cec51b4d
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|
4606 |
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diff
changeset
|
4607 // At this point the we have 'popped' cur from the collection set |
1316cec51b4d
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|
4608 // (linked via next_in_collection_set()) but it is still in the |
1316cec51b4d
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|
4609 // young list (linked via next_young_region()). Clear the |
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|
4610 // _next_young_region field. |
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|
4611 cur->set_next_young_region(NULL); |
342 | 4612 } else { |
4613 int index = cur->young_index_in_cset(); | |
4614 guarantee( index == -1, "invariant" ); | |
4615 } | |
4616 | |
4617 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
4618 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
4619 "invariant" ); | |
4620 | |
4621 if (!cur->evacuation_failed()) { | |
4622 // And the region is empty. | |
4623 assert(!cur->is_empty(), | |
4624 "Should not have empty regions in a CS."); | |
4625 free_region(cur); | |
4626 } else { | |
4627 cur->uninstall_surv_rate_group(); | |
4628 if (cur->is_young()) | |
4629 cur->set_young_index_in_cset(-1); | |
4630 cur->set_not_young(); | |
4631 cur->set_evacuation_failed(false); | |
4632 } | |
4633 cur = next; | |
4634 } | |
4635 | |
4636 policy->record_max_rs_lengths(rs_lengths); | |
4637 policy->cset_regions_freed(); | |
4638 | |
4639 double end_sec = os::elapsedTime(); | |
4640 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
4641 if (non_young) | |
4642 non_young_time_ms += elapsed_ms; | |
4643 else | |
4644 young_time_ms += elapsed_ms; | |
4645 | |
4646 policy->record_young_free_cset_time_ms(young_time_ms); | |
4647 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
4648 } | |
4649 | |
1394
1316cec51b4d
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|
4650 // This routine is similar to the above but does not record |
1316cec51b4d
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diff
changeset
|
4651 // any policy statistics or update free lists; we are abandoning |
1316cec51b4d
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1391
diff
changeset
|
4652 // the current incremental collection set in preparation of a |
1316cec51b4d
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diff
changeset
|
4653 // full collection. After the full GC we will start to build up |
1316cec51b4d
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diff
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|
4654 // the incremental collection set again. |
1316cec51b4d
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diff
changeset
|
4655 // This is only called when we're doing a full collection |
1316cec51b4d
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diff
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|
4656 // and is immediately followed by the tearing down of the young list. |
1316cec51b4d
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diff
changeset
|
4657 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
4658 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
|
4659 HeapRegion* cur = cs_head; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
4660 |
1316cec51b4d
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1391
diff
changeset
|
4661 while (cur != NULL) { |
1316cec51b4d
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diff
changeset
|
4662 HeapRegion* next = cur->next_in_collection_set(); |
1316cec51b4d
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changeset
|
4663 assert(cur->in_collection_set(), "bad CS"); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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4664 cur->set_next_in_collection_set(NULL); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
4665 cur->set_in_collection_set(false); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
4666 cur->set_young_index_in_cset(-1); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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4667 cur = next; |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
4668 } |
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|
4669 } |
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4670 |
342 | 4671 HeapRegion* |
4672 G1CollectedHeap::alloc_region_from_unclean_list_locked(bool zero_filled) { | |
4673 assert(ZF_mon->owned_by_self(), "Precondition"); | |
4674 HeapRegion* res = pop_unclean_region_list_locked(); | |
4675 if (res != NULL) { | |
4676 assert(!res->continuesHumongous() && | |
4677 res->zero_fill_state() != HeapRegion::Allocated, | |
4678 "Only free regions on unclean list."); | |
4679 if (zero_filled) { | |
4680 res->ensure_zero_filled_locked(); | |
4681 res->set_zero_fill_allocated(); | |
4682 } | |
4683 } | |
4684 return res; | |
4685 } | |
4686 | |
4687 HeapRegion* G1CollectedHeap::alloc_region_from_unclean_list(bool zero_filled) { | |
4688 MutexLockerEx zx(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4689 return alloc_region_from_unclean_list_locked(zero_filled); | |
4690 } | |
4691 | |
4692 void G1CollectedHeap::put_region_on_unclean_list(HeapRegion* r) { | |
4693 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4694 put_region_on_unclean_list_locked(r); | |
4695 if (should_zf()) ZF_mon->notify_all(); // Wake up ZF thread. | |
4696 } | |
4697 | |
4698 void G1CollectedHeap::set_unclean_regions_coming(bool b) { | |
4699 MutexLockerEx x(Cleanup_mon); | |
4700 set_unclean_regions_coming_locked(b); | |
4701 } | |
4702 | |
4703 void G1CollectedHeap::set_unclean_regions_coming_locked(bool b) { | |
4704 assert(Cleanup_mon->owned_by_self(), "Precondition"); | |
4705 _unclean_regions_coming = b; | |
4706 // Wake up mutator threads that might be waiting for completeCleanup to | |
4707 // finish. | |
4708 if (!b) Cleanup_mon->notify_all(); | |
4709 } | |
4710 | |
4711 void G1CollectedHeap::wait_for_cleanup_complete() { | |
4712 MutexLockerEx x(Cleanup_mon); | |
4713 wait_for_cleanup_complete_locked(); | |
4714 } | |
4715 | |
4716 void G1CollectedHeap::wait_for_cleanup_complete_locked() { | |
4717 assert(Cleanup_mon->owned_by_self(), "precondition"); | |
4718 while (_unclean_regions_coming) { | |
4719 Cleanup_mon->wait(); | |
4720 } | |
4721 } | |
4722 | |
4723 void | |
4724 G1CollectedHeap::put_region_on_unclean_list_locked(HeapRegion* r) { | |
4725 assert(ZF_mon->owned_by_self(), "precondition."); | |
1545
cc387008223e
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4726 #ifdef ASSERT |
cc387008223e
6921317: (partial) G1: assert(top() == bottom() || zfs == Allocated,"Region must be empty, or we must be setting it to
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4727 if (r->is_gc_alloc_region()) { |
cc387008223e
6921317: (partial) G1: assert(top() == bottom() || zfs == Allocated,"Region must be empty, or we must be setting it to
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4728 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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4729 stringStream region_str; |
cc387008223e
6921317: (partial) G1: assert(top() == bottom() || zfs == Allocated,"Region must be empty, or we must be setting it to
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4730 print_on(®ion_str); |
cc387008223e
6921317: (partial) G1: assert(top() == bottom() || zfs == Allocated,"Region must be empty, or we must be setting it to
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4731 assert(!r->is_gc_alloc_region(), err_msg("Unexpected GC allocation region: %s", |
cc387008223e
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4732 region_str.as_string())); |
cc387008223e
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4733 } |
cc387008223e
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4734 #endif |
342 | 4735 _unclean_region_list.insert_before_head(r); |
4736 } | |
4737 | |
4738 void | |
4739 G1CollectedHeap::prepend_region_list_on_unclean_list(UncleanRegionList* list) { | |
4740 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4741 prepend_region_list_on_unclean_list_locked(list); | |
4742 if (should_zf()) ZF_mon->notify_all(); // Wake up ZF thread. | |
4743 } | |
4744 | |
4745 void | |
4746 G1CollectedHeap:: | |
4747 prepend_region_list_on_unclean_list_locked(UncleanRegionList* list) { | |
4748 assert(ZF_mon->owned_by_self(), "precondition."); | |
4749 _unclean_region_list.prepend_list(list); | |
4750 } | |
4751 | |
4752 HeapRegion* G1CollectedHeap::pop_unclean_region_list_locked() { | |
4753 assert(ZF_mon->owned_by_self(), "precondition."); | |
4754 HeapRegion* res = _unclean_region_list.pop(); | |
4755 if (res != NULL) { | |
4756 // Inform ZF thread that there's a new unclean head. | |
4757 if (_unclean_region_list.hd() != NULL && should_zf()) | |
4758 ZF_mon->notify_all(); | |
4759 } | |
4760 return res; | |
4761 } | |
4762 | |
4763 HeapRegion* G1CollectedHeap::peek_unclean_region_list_locked() { | |
4764 assert(ZF_mon->owned_by_self(), "precondition."); | |
4765 return _unclean_region_list.hd(); | |
4766 } | |
4767 | |
4768 | |
4769 bool G1CollectedHeap::move_cleaned_region_to_free_list_locked() { | |
4770 assert(ZF_mon->owned_by_self(), "Precondition"); | |
4771 HeapRegion* r = peek_unclean_region_list_locked(); | |
4772 if (r != NULL && r->zero_fill_state() == HeapRegion::ZeroFilled) { | |
4773 // Result of below must be equal to "r", since we hold the lock. | |
4774 (void)pop_unclean_region_list_locked(); | |
4775 put_free_region_on_list_locked(r); | |
4776 return true; | |
4777 } else { | |
4778 return false; | |
4779 } | |
4780 } | |
4781 | |
4782 bool G1CollectedHeap::move_cleaned_region_to_free_list() { | |
4783 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4784 return move_cleaned_region_to_free_list_locked(); | |
4785 } | |
4786 | |
4787 | |
4788 void G1CollectedHeap::put_free_region_on_list_locked(HeapRegion* r) { | |
4789 assert(ZF_mon->owned_by_self(), "precondition."); | |
4790 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
4791 assert(r->zero_fill_state() == HeapRegion::ZeroFilled, | |
4792 "Regions on free list must be zero filled"); | |
4793 assert(!r->isHumongous(), "Must not be humongous."); | |
4794 assert(r->is_empty(), "Better be empty"); | |
4795 assert(!r->is_on_free_list(), | |
4796 "Better not already be on free list"); | |
4797 assert(!r->is_on_unclean_list(), | |
4798 "Better not already be on unclean list"); | |
4799 r->set_on_free_list(true); | |
4800 r->set_next_on_free_list(_free_region_list); | |
4801 _free_region_list = r; | |
4802 _free_region_list_size++; | |
4803 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
4804 } | |
4805 | |
4806 void G1CollectedHeap::put_free_region_on_list(HeapRegion* r) { | |
4807 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4808 put_free_region_on_list_locked(r); | |
4809 } | |
4810 | |
4811 HeapRegion* G1CollectedHeap::pop_free_region_list_locked() { | |
4812 assert(ZF_mon->owned_by_self(), "precondition."); | |
4813 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
4814 HeapRegion* res = _free_region_list; | |
4815 if (res != NULL) { | |
4816 _free_region_list = res->next_from_free_list(); | |
4817 _free_region_list_size--; | |
4818 res->set_on_free_list(false); | |
4819 res->set_next_on_free_list(NULL); | |
4820 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
4821 } | |
4822 return res; | |
4823 } | |
4824 | |
4825 | |
4826 HeapRegion* G1CollectedHeap::alloc_free_region_from_lists(bool zero_filled) { | |
4827 // By self, or on behalf of self. | |
4828 assert(Heap_lock->is_locked(), "Precondition"); | |
4829 HeapRegion* res = NULL; | |
4830 bool first = true; | |
4831 while (res == NULL) { | |
4832 if (zero_filled || !first) { | |
4833 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4834 res = pop_free_region_list_locked(); | |
4835 if (res != NULL) { | |
4836 assert(!res->zero_fill_is_allocated(), | |
4837 "No allocated regions on free list."); | |
4838 res->set_zero_fill_allocated(); | |
4839 } else if (!first) { | |
4840 break; // We tried both, time to return NULL. | |
4841 } | |
4842 } | |
4843 | |
4844 if (res == NULL) { | |
4845 res = alloc_region_from_unclean_list(zero_filled); | |
4846 } | |
4847 assert(res == NULL || | |
4848 !zero_filled || | |
4849 res->zero_fill_is_allocated(), | |
4850 "We must have allocated the region we're returning"); | |
4851 first = false; | |
4852 } | |
4853 return res; | |
4854 } | |
4855 | |
4856 void G1CollectedHeap::remove_allocated_regions_from_lists() { | |
4857 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4858 { | |
4859 HeapRegion* prev = NULL; | |
4860 HeapRegion* cur = _unclean_region_list.hd(); | |
4861 while (cur != NULL) { | |
4862 HeapRegion* next = cur->next_from_unclean_list(); | |
4863 if (cur->zero_fill_is_allocated()) { | |
4864 // Remove from the list. | |
4865 if (prev == NULL) { | |
4866 (void)_unclean_region_list.pop(); | |
4867 } else { | |
4868 _unclean_region_list.delete_after(prev); | |
4869 } | |
4870 cur->set_on_unclean_list(false); | |
4871 cur->set_next_on_unclean_list(NULL); | |
4872 } else { | |
4873 prev = cur; | |
4874 } | |
4875 cur = next; | |
4876 } | |
4877 assert(_unclean_region_list.sz() == unclean_region_list_length(), | |
4878 "Inv"); | |
4879 } | |
4880 | |
4881 { | |
4882 HeapRegion* prev = NULL; | |
4883 HeapRegion* cur = _free_region_list; | |
4884 while (cur != NULL) { | |
4885 HeapRegion* next = cur->next_from_free_list(); | |
4886 if (cur->zero_fill_is_allocated()) { | |
4887 // Remove from the list. | |
4888 if (prev == NULL) { | |
4889 _free_region_list = cur->next_from_free_list(); | |
4890 } else { | |
4891 prev->set_next_on_free_list(cur->next_from_free_list()); | |
4892 } | |
4893 cur->set_on_free_list(false); | |
4894 cur->set_next_on_free_list(NULL); | |
4895 _free_region_list_size--; | |
4896 } else { | |
4897 prev = cur; | |
4898 } | |
4899 cur = next; | |
4900 } | |
4901 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
4902 } | |
4903 } | |
4904 | |
4905 bool G1CollectedHeap::verify_region_lists() { | |
4906 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4907 return verify_region_lists_locked(); | |
4908 } | |
4909 | |
4910 bool G1CollectedHeap::verify_region_lists_locked() { | |
4911 HeapRegion* unclean = _unclean_region_list.hd(); | |
4912 while (unclean != NULL) { | |
4913 guarantee(unclean->is_on_unclean_list(), "Well, it is!"); | |
4914 guarantee(!unclean->is_on_free_list(), "Well, it shouldn't be!"); | |
4915 guarantee(unclean->zero_fill_state() != HeapRegion::Allocated, | |
4916 "Everything else is possible."); | |
4917 unclean = unclean->next_from_unclean_list(); | |
4918 } | |
4919 guarantee(_unclean_region_list.sz() == unclean_region_list_length(), "Inv"); | |
4920 | |
4921 HeapRegion* free_r = _free_region_list; | |
4922 while (free_r != NULL) { | |
4923 assert(free_r->is_on_free_list(), "Well, it is!"); | |
4924 assert(!free_r->is_on_unclean_list(), "Well, it shouldn't be!"); | |
4925 switch (free_r->zero_fill_state()) { | |
4926 case HeapRegion::NotZeroFilled: | |
4927 case HeapRegion::ZeroFilling: | |
4928 guarantee(false, "Should not be on free list."); | |
4929 break; | |
4930 default: | |
4931 // Everything else is possible. | |
4932 break; | |
4933 } | |
4934 free_r = free_r->next_from_free_list(); | |
4935 } | |
4936 guarantee(_free_region_list_size == free_region_list_length(), "Inv"); | |
4937 // If we didn't do an assertion... | |
4938 return true; | |
4939 } | |
4940 | |
4941 size_t G1CollectedHeap::free_region_list_length() { | |
4942 assert(ZF_mon->owned_by_self(), "precondition."); | |
4943 size_t len = 0; | |
4944 HeapRegion* cur = _free_region_list; | |
4945 while (cur != NULL) { | |
4946 len++; | |
4947 cur = cur->next_from_free_list(); | |
4948 } | |
4949 return len; | |
4950 } | |
4951 | |
4952 size_t G1CollectedHeap::unclean_region_list_length() { | |
4953 assert(ZF_mon->owned_by_self(), "precondition."); | |
4954 return _unclean_region_list.length(); | |
4955 } | |
4956 | |
4957 size_t G1CollectedHeap::n_regions() { | |
4958 return _hrs->length(); | |
4959 } | |
4960 | |
4961 size_t G1CollectedHeap::max_regions() { | |
4962 return | |
4963 (size_t)align_size_up(g1_reserved_obj_bytes(), HeapRegion::GrainBytes) / | |
4964 HeapRegion::GrainBytes; | |
4965 } | |
4966 | |
4967 size_t G1CollectedHeap::free_regions() { | |
4968 /* Possibly-expensive assert. | |
4969 assert(_free_regions == count_free_regions(), | |
4970 "_free_regions is off."); | |
4971 */ | |
4972 return _free_regions; | |
4973 } | |
4974 | |
4975 bool G1CollectedHeap::should_zf() { | |
4976 return _free_region_list_size < (size_t) G1ConcZFMaxRegions; | |
4977 } | |
4978 | |
4979 class RegionCounter: public HeapRegionClosure { | |
4980 size_t _n; | |
4981 public: | |
4982 RegionCounter() : _n(0) {} | |
4983 bool doHeapRegion(HeapRegion* r) { | |
677 | 4984 if (r->is_empty()) { |
342 | 4985 assert(!r->isHumongous(), "H regions should not be empty."); |
4986 _n++; | |
4987 } | |
4988 return false; | |
4989 } | |
4990 int res() { return (int) _n; } | |
4991 }; | |
4992 | |
4993 size_t G1CollectedHeap::count_free_regions() { | |
4994 RegionCounter rc; | |
4995 heap_region_iterate(&rc); | |
4996 size_t n = rc.res(); | |
4997 if (_cur_alloc_region != NULL && _cur_alloc_region->is_empty()) | |
4998 n--; | |
4999 return n; | |
5000 } | |
5001 | |
5002 size_t G1CollectedHeap::count_free_regions_list() { | |
5003 size_t n = 0; | |
5004 size_t o = 0; | |
5005 ZF_mon->lock_without_safepoint_check(); | |
5006 HeapRegion* cur = _free_region_list; | |
5007 while (cur != NULL) { | |
5008 cur = cur->next_from_free_list(); | |
5009 n++; | |
5010 } | |
5011 size_t m = unclean_region_list_length(); | |
5012 ZF_mon->unlock(); | |
5013 return n + m; | |
5014 } | |
5015 | |
5016 bool G1CollectedHeap::should_set_young_locked() { | |
5017 assert(heap_lock_held_for_gc(), | |
5018 "the heap lock should already be held by or for this thread"); | |
5019 return (g1_policy()->in_young_gc_mode() && | |
5020 g1_policy()->should_add_next_region_to_young_list()); | |
5021 } | |
5022 | |
5023 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
5024 assert(heap_lock_held_for_gc(), | |
5025 "the heap lock should already be held by or for this thread"); | |
5026 _young_list->push_region(hr); | |
5027 g1_policy()->set_region_short_lived(hr); | |
5028 } | |
5029 | |
5030 class NoYoungRegionsClosure: public HeapRegionClosure { | |
5031 private: | |
5032 bool _success; | |
5033 public: | |
5034 NoYoungRegionsClosure() : _success(true) { } | |
5035 bool doHeapRegion(HeapRegion* r) { | |
5036 if (r->is_young()) { | |
5037 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
5038 r->bottom(), r->end()); | |
5039 _success = false; | |
5040 } | |
5041 return false; | |
5042 } | |
5043 bool success() { return _success; } | |
5044 }; | |
5045 | |
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5046 bool G1CollectedHeap::check_young_list_empty(bool check_heap, bool check_sample) { |
1316cec51b4d
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diff
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5047 bool ret = _young_list->check_list_empty(check_sample); |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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5048 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
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5049 if (check_heap) { |
342 | 5050 NoYoungRegionsClosure closure; |
5051 heap_region_iterate(&closure); | |
5052 ret = ret && closure.success(); | |
5053 } | |
5054 | |
5055 return ret; | |
5056 } | |
5057 | |
5058 void G1CollectedHeap::empty_young_list() { | |
5059 assert(heap_lock_held_for_gc(), | |
5060 "the heap lock should already be held by or for this thread"); | |
5061 assert(g1_policy()->in_young_gc_mode(), "should be in young GC mode"); | |
5062 | |
5063 _young_list->empty_list(); | |
5064 } | |
5065 | |
5066 bool G1CollectedHeap::all_alloc_regions_no_allocs_since_save_marks() { | |
5067 bool no_allocs = true; | |
5068 for (int ap = 0; ap < GCAllocPurposeCount && no_allocs; ++ap) { | |
5069 HeapRegion* r = _gc_alloc_regions[ap]; | |
5070 no_allocs = r == NULL || r->saved_mark_at_top(); | |
5071 } | |
5072 return no_allocs; | |
5073 } | |
5074 | |
545 | 5075 void G1CollectedHeap::retire_all_alloc_regions() { |
342 | 5076 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
5077 HeapRegion* r = _gc_alloc_regions[ap]; | |
5078 if (r != NULL) { | |
5079 // Check for aliases. | |
5080 bool has_processed_alias = false; | |
5081 for (int i = 0; i < ap; ++i) { | |
5082 if (_gc_alloc_regions[i] == r) { | |
5083 has_processed_alias = true; | |
5084 break; | |
5085 } | |
5086 } | |
5087 if (!has_processed_alias) { | |
545 | 5088 retire_alloc_region(r, false /* par */); |
342 | 5089 } |
5090 } | |
5091 } | |
5092 } | |
5093 | |
5094 | |
5095 // Done at the start of full GC. | |
5096 void G1CollectedHeap::tear_down_region_lists() { | |
5097 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
5098 while (pop_unclean_region_list_locked() != NULL) ; | |
5099 assert(_unclean_region_list.hd() == NULL && _unclean_region_list.sz() == 0, | |
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5100 "Postconditions of loop."); |
342 | 5101 while (pop_free_region_list_locked() != NULL) ; |
5102 assert(_free_region_list == NULL, "Postcondition of loop."); | |
5103 if (_free_region_list_size != 0) { | |
5104 gclog_or_tty->print_cr("Size is %d.", _free_region_list_size); | |
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5105 print_on(gclog_or_tty, true /* extended */); |
342 | 5106 } |
5107 assert(_free_region_list_size == 0, "Postconditions of loop."); | |
5108 } | |
5109 | |
5110 | |
5111 class RegionResetter: public HeapRegionClosure { | |
5112 G1CollectedHeap* _g1; | |
5113 int _n; | |
5114 public: | |
5115 RegionResetter() : _g1(G1CollectedHeap::heap()), _n(0) {} | |
5116 bool doHeapRegion(HeapRegion* r) { | |
5117 if (r->continuesHumongous()) return false; | |
5118 if (r->top() > r->bottom()) { | |
5119 if (r->top() < r->end()) { | |
5120 Copy::fill_to_words(r->top(), | |
5121 pointer_delta(r->end(), r->top())); | |
5122 } | |
5123 r->set_zero_fill_allocated(); | |
5124 } else { | |
5125 assert(r->is_empty(), "tautology"); | |
677 | 5126 _n++; |
5127 switch (r->zero_fill_state()) { | |
342 | 5128 case HeapRegion::NotZeroFilled: |
5129 case HeapRegion::ZeroFilling: | |
5130 _g1->put_region_on_unclean_list_locked(r); | |
5131 break; | |
5132 case HeapRegion::Allocated: | |
5133 r->set_zero_fill_complete(); | |
5134 // no break; go on to put on free list. | |
5135 case HeapRegion::ZeroFilled: | |
5136 _g1->put_free_region_on_list_locked(r); | |
5137 break; | |
5138 } | |
5139 } | |
5140 return false; | |
5141 } | |
5142 | |
5143 int getFreeRegionCount() {return _n;} | |
5144 }; | |
5145 | |
5146 // Done at the end of full GC. | |
5147 void G1CollectedHeap::rebuild_region_lists() { | |
5148 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
5149 // This needs to go at the end of the full GC. | |
5150 RegionResetter rs; | |
5151 heap_region_iterate(&rs); | |
5152 _free_regions = rs.getFreeRegionCount(); | |
5153 // Tell the ZF thread it may have work to do. | |
5154 if (should_zf()) ZF_mon->notify_all(); | |
5155 } | |
5156 | |
5157 class UsedRegionsNeedZeroFillSetter: public HeapRegionClosure { | |
5158 G1CollectedHeap* _g1; | |
5159 int _n; | |
5160 public: | |
5161 UsedRegionsNeedZeroFillSetter() : _g1(G1CollectedHeap::heap()), _n(0) {} | |
5162 bool doHeapRegion(HeapRegion* r) { | |
5163 if (r->continuesHumongous()) return false; | |
5164 if (r->top() > r->bottom()) { | |
5165 // There are assertions in "set_zero_fill_needed()" below that | |
5166 // require top() == bottom(), so this is technically illegal. | |
5167 // We'll skirt the law here, by making that true temporarily. | |
5168 DEBUG_ONLY(HeapWord* save_top = r->top(); | |
5169 r->set_top(r->bottom())); | |
5170 r->set_zero_fill_needed(); | |
5171 DEBUG_ONLY(r->set_top(save_top)); | |
5172 } | |
5173 return false; | |
5174 } | |
5175 }; | |
5176 | |
5177 // Done at the start of full GC. | |
5178 void G1CollectedHeap::set_used_regions_to_need_zero_fill() { | |
5179 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
5180 // This needs to go at the end of the full GC. | |
5181 UsedRegionsNeedZeroFillSetter rs; | |
5182 heap_region_iterate(&rs); | |
5183 } | |
5184 | |
5185 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
5186 _refine_cte_cl->set_concurrent(concurrent); | |
5187 } | |
5188 | |
5189 #ifndef PRODUCT | |
5190 | |
5191 class PrintHeapRegionClosure: public HeapRegionClosure { | |
5192 public: | |
5193 bool doHeapRegion(HeapRegion *r) { | |
5194 gclog_or_tty->print("Region: "PTR_FORMAT":", r); | |
5195 if (r != NULL) { | |
5196 if (r->is_on_free_list()) | |
5197 gclog_or_tty->print("Free "); | |
5198 if (r->is_young()) | |
5199 gclog_or_tty->print("Young "); | |
5200 if (r->isHumongous()) | |
5201 gclog_or_tty->print("Is Humongous "); | |
5202 r->print(); | |
5203 } | |
5204 return false; | |
5205 } | |
5206 }; | |
5207 | |
5208 class SortHeapRegionClosure : public HeapRegionClosure { | |
5209 size_t young_regions,free_regions, unclean_regions; | |
5210 size_t hum_regions, count; | |
5211 size_t unaccounted, cur_unclean, cur_alloc; | |
5212 size_t total_free; | |
5213 HeapRegion* cur; | |
5214 public: | |
5215 SortHeapRegionClosure(HeapRegion *_cur) : cur(_cur), young_regions(0), | |
5216 free_regions(0), unclean_regions(0), | |
5217 hum_regions(0), | |
5218 count(0), unaccounted(0), | |
5219 cur_alloc(0), total_free(0) | |
5220 {} | |
5221 bool doHeapRegion(HeapRegion *r) { | |
5222 count++; | |
5223 if (r->is_on_free_list()) free_regions++; | |
5224 else if (r->is_on_unclean_list()) unclean_regions++; | |
5225 else if (r->isHumongous()) hum_regions++; | |
5226 else if (r->is_young()) young_regions++; | |
5227 else if (r == cur) cur_alloc++; | |
5228 else unaccounted++; | |
5229 return false; | |
5230 } | |
5231 void print() { | |
5232 total_free = free_regions + unclean_regions; | |
5233 gclog_or_tty->print("%d regions\n", count); | |
5234 gclog_or_tty->print("%d free: free_list = %d unclean = %d\n", | |
5235 total_free, free_regions, unclean_regions); | |
5236 gclog_or_tty->print("%d humongous %d young\n", | |
5237 hum_regions, young_regions); | |
5238 gclog_or_tty->print("%d cur_alloc\n", cur_alloc); | |
5239 gclog_or_tty->print("UHOH unaccounted = %d\n", unaccounted); | |
5240 } | |
5241 }; | |
5242 | |
5243 void G1CollectedHeap::print_region_counts() { | |
5244 SortHeapRegionClosure sc(_cur_alloc_region); | |
5245 PrintHeapRegionClosure cl; | |
5246 heap_region_iterate(&cl); | |
5247 heap_region_iterate(&sc); | |
5248 sc.print(); | |
5249 print_region_accounting_info(); | |
5250 }; | |
5251 | |
5252 bool G1CollectedHeap::regions_accounted_for() { | |
5253 // TODO: regions accounting for young/survivor/tenured | |
5254 return true; | |
5255 } | |
5256 | |
5257 bool G1CollectedHeap::print_region_accounting_info() { | |
5258 gclog_or_tty->print_cr("Free regions: %d (count: %d count list %d) (clean: %d unclean: %d).", | |
5259 free_regions(), | |
5260 count_free_regions(), count_free_regions_list(), | |
5261 _free_region_list_size, _unclean_region_list.sz()); | |
5262 gclog_or_tty->print_cr("cur_alloc: %d.", | |
5263 (_cur_alloc_region == NULL ? 0 : 1)); | |
5264 gclog_or_tty->print_cr("H regions: %d.", _num_humongous_regions); | |
5265 | |
5266 // TODO: check regions accounting for young/survivor/tenured | |
5267 return true; | |
5268 } | |
5269 | |
5270 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
5271 HeapRegion* hr = heap_region_containing(p); | |
5272 if (hr == NULL) { | |
5273 return is_in_permanent(p); | |
5274 } else { | |
5275 return hr->is_in(p); | |
5276 } | |
5277 } | |
941 | 5278 #endif // !PRODUCT |
342 | 5279 |
5280 void G1CollectedHeap::g1_unimplemented() { | |
5281 // Unimplemented(); | |
5282 } |