Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 1972:f95d63e2154a
6989984: Use standard include model for Hospot
Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg
author | stefank |
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date | Tue, 23 Nov 2010 13:22:55 -0800 |
parents | 878b57474103 |
children | 631f79e71e90 |
rev | line source |
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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 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "code/icBuffer.hpp" | |
27 #include "gc_implementation/g1/bufferingOopClosure.hpp" | |
28 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
29 #include "gc_implementation/g1/concurrentG1RefineThread.hpp" | |
30 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
31 #include "gc_implementation/g1/concurrentZFThread.hpp" | |
32 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
33 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
34 #include "gc_implementation/g1/g1MarkSweep.hpp" | |
35 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
36 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
37 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
38 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
39 #include "gc_implementation/g1/vm_operations_g1.hpp" | |
40 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
41 #include "memory/gcLocker.inline.hpp" | |
42 #include "memory/genOopClosures.inline.hpp" | |
43 #include "memory/generationSpec.hpp" | |
44 #include "oops/oop.inline.hpp" | |
45 #include "oops/oop.pcgc.inline.hpp" | |
46 #include "runtime/aprofiler.hpp" | |
47 #include "runtime/vmThread.hpp" | |
342 | 48 |
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49 size_t G1CollectedHeap::_humongous_object_threshold_in_words = 0; |
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50 |
342 | 51 // turn it on so that the contents of the young list (scan-only / |
52 // to-be-collected) are printed at "strategic" points before / during | |
53 // / after the collection --- this is useful for debugging | |
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54 #define YOUNG_LIST_VERBOSE 0 |
342 | 55 // CURRENT STATUS |
56 // This file is under construction. Search for "FIXME". | |
57 | |
58 // INVARIANTS/NOTES | |
59 // | |
60 // All allocation activity covered by the G1CollectedHeap interface is | |
61 // serialized by acquiring the HeapLock. This happens in | |
62 // mem_allocate_work, which all such allocation functions call. | |
63 // (Note that this does not apply to TLAB allocation, which is not part | |
64 // of this interface: it is done by clients of this interface.) | |
65 | |
66 // Local to this file. | |
67 | |
68 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
69 SuspendibleThreadSet* _sts; | |
70 G1RemSet* _g1rs; | |
71 ConcurrentG1Refine* _cg1r; | |
72 bool _concurrent; | |
73 public: | |
74 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
75 G1RemSet* g1rs, | |
76 ConcurrentG1Refine* cg1r) : | |
77 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
78 {} | |
79 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
1705 | 80 bool oops_into_cset = _g1rs->concurrentRefineOneCard(card_ptr, worker_i, false); |
81 // This path is executed by the concurrent refine or mutator threads, | |
82 // concurrently, and so we do not care if card_ptr contains references | |
83 // that point into the collection set. | |
84 assert(!oops_into_cset, "should be"); | |
85 | |
342 | 86 if (_concurrent && _sts->should_yield()) { |
87 // Caller will actually yield. | |
88 return false; | |
89 } | |
90 // Otherwise, we finished successfully; return true. | |
91 return true; | |
92 } | |
93 void set_concurrent(bool b) { _concurrent = b; } | |
94 }; | |
95 | |
96 | |
97 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
98 int _calls; | |
99 G1CollectedHeap* _g1h; | |
100 CardTableModRefBS* _ctbs; | |
101 int _histo[256]; | |
102 public: | |
103 ClearLoggedCardTableEntryClosure() : | |
104 _calls(0) | |
105 { | |
106 _g1h = G1CollectedHeap::heap(); | |
107 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
108 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
109 } | |
110 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
111 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
112 _calls++; | |
113 unsigned char* ujb = (unsigned char*)card_ptr; | |
114 int ind = (int)(*ujb); | |
115 _histo[ind]++; | |
116 *card_ptr = -1; | |
117 } | |
118 return true; | |
119 } | |
120 int calls() { return _calls; } | |
121 void print_histo() { | |
122 gclog_or_tty->print_cr("Card table value histogram:"); | |
123 for (int i = 0; i < 256; i++) { | |
124 if (_histo[i] != 0) { | |
125 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
126 } | |
127 } | |
128 } | |
129 }; | |
130 | |
131 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
132 int _calls; | |
133 G1CollectedHeap* _g1h; | |
134 CardTableModRefBS* _ctbs; | |
135 public: | |
136 RedirtyLoggedCardTableEntryClosure() : | |
137 _calls(0) | |
138 { | |
139 _g1h = G1CollectedHeap::heap(); | |
140 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
141 } | |
142 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
143 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
144 _calls++; | |
145 *card_ptr = 0; | |
146 } | |
147 return true; | |
148 } | |
149 int calls() { return _calls; } | |
150 }; | |
151 | |
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152 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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153 public: |
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154 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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155 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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156 return true; |
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157 } |
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158 }; |
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159 |
342 | 160 YoungList::YoungList(G1CollectedHeap* g1h) |
161 : _g1h(g1h), _head(NULL), | |
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162 _length(0), |
342 | 163 _last_sampled_rs_lengths(0), |
545 | 164 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) |
342 | 165 { |
166 guarantee( check_list_empty(false), "just making sure..." ); | |
167 } | |
168 | |
169 void YoungList::push_region(HeapRegion *hr) { | |
170 assert(!hr->is_young(), "should not already be young"); | |
171 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
172 | |
173 hr->set_next_young_region(_head); | |
174 _head = hr; | |
175 | |
176 hr->set_young(); | |
177 double yg_surv_rate = _g1h->g1_policy()->predict_yg_surv_rate((int)_length); | |
178 ++_length; | |
179 } | |
180 | |
181 void YoungList::add_survivor_region(HeapRegion* hr) { | |
545 | 182 assert(hr->is_survivor(), "should be flagged as survivor region"); |
342 | 183 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
184 | |
185 hr->set_next_young_region(_survivor_head); | |
186 if (_survivor_head == NULL) { | |
545 | 187 _survivor_tail = hr; |
342 | 188 } |
189 _survivor_head = hr; | |
190 | |
191 ++_survivor_length; | |
192 } | |
193 | |
194 void YoungList::empty_list(HeapRegion* list) { | |
195 while (list != NULL) { | |
196 HeapRegion* next = list->get_next_young_region(); | |
197 list->set_next_young_region(NULL); | |
198 list->uninstall_surv_rate_group(); | |
199 list->set_not_young(); | |
200 list = next; | |
201 } | |
202 } | |
203 | |
204 void YoungList::empty_list() { | |
205 assert(check_list_well_formed(), "young list should be well formed"); | |
206 | |
207 empty_list(_head); | |
208 _head = NULL; | |
209 _length = 0; | |
210 | |
211 empty_list(_survivor_head); | |
212 _survivor_head = NULL; | |
545 | 213 _survivor_tail = NULL; |
342 | 214 _survivor_length = 0; |
215 | |
216 _last_sampled_rs_lengths = 0; | |
217 | |
218 assert(check_list_empty(false), "just making sure..."); | |
219 } | |
220 | |
221 bool YoungList::check_list_well_formed() { | |
222 bool ret = true; | |
223 | |
224 size_t length = 0; | |
225 HeapRegion* curr = _head; | |
226 HeapRegion* last = NULL; | |
227 while (curr != NULL) { | |
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228 if (!curr->is_young()) { |
342 | 229 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " |
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230 "incorrectly tagged (y: %d, surv: %d)", |
342 | 231 curr->bottom(), curr->end(), |
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232 curr->is_young(), curr->is_survivor()); |
342 | 233 ret = false; |
234 } | |
235 ++length; | |
236 last = curr; | |
237 curr = curr->get_next_young_region(); | |
238 } | |
239 ret = ret && (length == _length); | |
240 | |
241 if (!ret) { | |
242 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
243 gclog_or_tty->print_cr("### list has %d entries, _length is %d", | |
244 length, _length); | |
245 } | |
246 | |
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247 return ret; |
342 | 248 } |
249 | |
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250 bool YoungList::check_list_empty(bool check_sample) { |
342 | 251 bool ret = true; |
252 | |
253 if (_length != 0) { | |
254 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %d", | |
255 _length); | |
256 ret = false; | |
257 } | |
258 if (check_sample && _last_sampled_rs_lengths != 0) { | |
259 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
260 ret = false; | |
261 } | |
262 if (_head != NULL) { | |
263 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
264 ret = false; | |
265 } | |
266 if (!ret) { | |
267 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
268 } | |
269 | |
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270 return ret; |
342 | 271 } |
272 | |
273 void | |
274 YoungList::rs_length_sampling_init() { | |
275 _sampled_rs_lengths = 0; | |
276 _curr = _head; | |
277 } | |
278 | |
279 bool | |
280 YoungList::rs_length_sampling_more() { | |
281 return _curr != NULL; | |
282 } | |
283 | |
284 void | |
285 YoungList::rs_length_sampling_next() { | |
286 assert( _curr != NULL, "invariant" ); | |
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287 size_t rs_length = _curr->rem_set()->occupied(); |
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288 |
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289 _sampled_rs_lengths += rs_length; |
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290 |
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291 // The current region may not yet have been added to the |
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292 // incremental collection set (it gets added when it is |
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293 // retired as the current allocation region). |
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294 if (_curr->in_collection_set()) { |
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295 // Update the collection set policy information for this region |
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296 _g1h->g1_policy()->update_incremental_cset_info(_curr, rs_length); |
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297 } |
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298 |
342 | 299 _curr = _curr->get_next_young_region(); |
300 if (_curr == NULL) { | |
301 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
302 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
303 } | |
304 } | |
305 | |
306 void | |
307 YoungList::reset_auxilary_lists() { | |
308 guarantee( is_empty(), "young list should be empty" ); | |
309 assert(check_list_well_formed(), "young list should be well formed"); | |
310 | |
311 // Add survivor regions to SurvRateGroup. | |
312 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
545 | 313 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
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314 |
342 | 315 for (HeapRegion* curr = _survivor_head; |
316 curr != NULL; | |
317 curr = curr->get_next_young_region()) { | |
318 _g1h->g1_policy()->set_region_survivors(curr); | |
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319 |
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320 // The region is a non-empty survivor so let's add it to |
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321 // the incremental collection set for the next evacuation |
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322 // pause. |
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323 _g1h->g1_policy()->add_region_to_incremental_cset_rhs(curr); |
342 | 324 } |
325 _g1h->g1_policy()->note_stop_adding_survivor_regions(); | |
326 | |
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327 _head = _survivor_head; |
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328 _length = _survivor_length; |
342 | 329 if (_survivor_head != NULL) { |
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330 assert(_survivor_tail != NULL, "cause it shouldn't be"); |
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331 assert(_survivor_length > 0, "invariant"); |
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332 _survivor_tail->set_next_young_region(NULL); |
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333 } |
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334 |
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335 // Don't clear the survivor list handles until the start of |
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336 // the next evacuation pause - we need it in order to re-tag |
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337 // the survivor regions from this evacuation pause as 'young' |
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338 // at the start of the next. |
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339 |
545 | 340 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
342 | 341 |
342 assert(check_list_well_formed(), "young list should be well formed"); | |
343 } | |
344 | |
345 void YoungList::print() { | |
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346 HeapRegion* lists[] = {_head, _survivor_head}; |
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347 const char* names[] = {"YOUNG", "SURVIVOR"}; |
342 | 348 |
349 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
350 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
351 HeapRegion *curr = lists[list]; | |
352 if (curr == NULL) | |
353 gclog_or_tty->print_cr(" empty"); | |
354 while (curr != NULL) { | |
355 gclog_or_tty->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " | |
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356 "age: %4d, y: %d, surv: %d", |
342 | 357 curr->bottom(), curr->end(), |
358 curr->top(), | |
359 curr->prev_top_at_mark_start(), | |
360 curr->next_top_at_mark_start(), | |
361 curr->top_at_conc_mark_count(), | |
362 curr->age_in_surv_rate_group_cond(), | |
363 curr->is_young(), | |
364 curr->is_survivor()); | |
365 curr = curr->get_next_young_region(); | |
366 } | |
367 } | |
368 | |
369 gclog_or_tty->print_cr(""); | |
370 } | |
371 | |
796
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372 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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373 { |
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374 // Claim the right to put the region on the dirty cards region list |
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375 // by installing a self pointer. |
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376 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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377 if (next == NULL) { |
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378 HeapRegion* res = (HeapRegion*) |
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379 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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380 NULL); |
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381 if (res == NULL) { |
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382 HeapRegion* head; |
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383 do { |
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384 // Put the region to the dirty cards region list. |
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385 head = _dirty_cards_region_list; |
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386 next = (HeapRegion*) |
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387 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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388 if (next == head) { |
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389 assert(hr->get_next_dirty_cards_region() == hr, |
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390 "hr->get_next_dirty_cards_region() != hr"); |
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391 if (next == NULL) { |
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392 // The last region in the list points to itself. |
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393 hr->set_next_dirty_cards_region(hr); |
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394 } else { |
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395 hr->set_next_dirty_cards_region(next); |
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396 } |
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397 } |
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398 } while (next != head); |
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399 } |
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400 } |
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401 } |
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402 |
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403 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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404 { |
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405 HeapRegion* head; |
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406 HeapRegion* hr; |
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407 do { |
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408 head = _dirty_cards_region_list; |
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409 if (head == NULL) { |
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410 return NULL; |
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411 } |
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412 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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413 if (head == new_head) { |
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414 // The last region. |
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415 new_head = NULL; |
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416 } |
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417 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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418 head); |
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419 } while (hr != head); |
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420 assert(hr != NULL, "invariant"); |
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421 hr->set_next_dirty_cards_region(NULL); |
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422 return hr; |
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423 } |
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424 |
342 | 425 void G1CollectedHeap::stop_conc_gc_threads() { |
794 | 426 _cg1r->stop(); |
342 | 427 _czft->stop(); |
428 _cmThread->stop(); | |
429 } | |
430 | |
431 | |
432 void G1CollectedHeap::check_ct_logs_at_safepoint() { | |
433 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
434 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
435 | |
436 // Count the dirty cards at the start. | |
437 CountNonCleanMemRegionClosure count1(this); | |
438 ct_bs->mod_card_iterate(&count1); | |
439 int orig_count = count1.n(); | |
440 | |
441 // First clear the logged cards. | |
442 ClearLoggedCardTableEntryClosure clear; | |
443 dcqs.set_closure(&clear); | |
444 dcqs.apply_closure_to_all_completed_buffers(); | |
445 dcqs.iterate_closure_all_threads(false); | |
446 clear.print_histo(); | |
447 | |
448 // Now ensure that there's no dirty cards. | |
449 CountNonCleanMemRegionClosure count2(this); | |
450 ct_bs->mod_card_iterate(&count2); | |
451 if (count2.n() != 0) { | |
452 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
453 count2.n(), orig_count); | |
454 } | |
455 guarantee(count2.n() == 0, "Card table should be clean."); | |
456 | |
457 RedirtyLoggedCardTableEntryClosure redirty; | |
458 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
459 dcqs.apply_closure_to_all_completed_buffers(); | |
460 dcqs.iterate_closure_all_threads(false); | |
461 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
462 clear.calls(), orig_count); | |
463 guarantee(redirty.calls() == clear.calls(), | |
464 "Or else mechanism is broken."); | |
465 | |
466 CountNonCleanMemRegionClosure count3(this); | |
467 ct_bs->mod_card_iterate(&count3); | |
468 if (count3.n() != orig_count) { | |
469 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
470 orig_count, count3.n()); | |
471 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
472 } | |
473 | |
474 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
475 } | |
476 | |
477 // Private class members. | |
478 | |
479 G1CollectedHeap* G1CollectedHeap::_g1h; | |
480 | |
481 // Private methods. | |
482 | |
483 // Finds a HeapRegion that can be used to allocate a given size of block. | |
484 | |
485 | |
486 HeapRegion* G1CollectedHeap::newAllocRegion_work(size_t word_size, | |
487 bool do_expand, | |
488 bool zero_filled) { | |
489 ConcurrentZFThread::note_region_alloc(); | |
490 HeapRegion* res = alloc_free_region_from_lists(zero_filled); | |
491 if (res == NULL && do_expand) { | |
492 expand(word_size * HeapWordSize); | |
493 res = alloc_free_region_from_lists(zero_filled); | |
494 assert(res == NULL || | |
495 (!res->isHumongous() && | |
496 (!zero_filled || | |
497 res->zero_fill_state() == HeapRegion::Allocated)), | |
498 "Alloc Regions must be zero filled (and non-H)"); | |
499 } | |
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500 if (res != NULL) { |
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501 if (res->is_empty()) { |
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502 _free_regions--; |
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503 } |
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504 assert(!res->isHumongous() && |
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505 (!zero_filled || res->zero_fill_state() == HeapRegion::Allocated), |
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506 err_msg("Non-young alloc Regions must be zero filled (and non-H):" |
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507 " res->isHumongous()=%d, zero_filled=%d, res->zero_fill_state()=%d", |
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508 res->isHumongous(), zero_filled, res->zero_fill_state())); |
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509 assert(!res->is_on_unclean_list(), |
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510 "Alloc Regions must not be on the unclean list"); |
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511 if (G1PrintHeapRegions) { |
342 | 512 gclog_or_tty->print_cr("new alloc region %d:["PTR_FORMAT", "PTR_FORMAT"], " |
513 "top "PTR_FORMAT, | |
514 res->hrs_index(), res->bottom(), res->end(), res->top()); | |
515 } | |
516 } | |
517 return res; | |
518 } | |
519 | |
520 HeapRegion* G1CollectedHeap::newAllocRegionWithExpansion(int purpose, | |
521 size_t word_size, | |
522 bool zero_filled) { | |
523 HeapRegion* alloc_region = NULL; | |
524 if (_gc_alloc_region_counts[purpose] < g1_policy()->max_regions(purpose)) { | |
525 alloc_region = newAllocRegion_work(word_size, true, zero_filled); | |
526 if (purpose == GCAllocForSurvived && alloc_region != NULL) { | |
545 | 527 alloc_region->set_survivor(); |
342 | 528 } |
529 ++_gc_alloc_region_counts[purpose]; | |
530 } else { | |
531 g1_policy()->note_alloc_region_limit_reached(purpose); | |
532 } | |
533 return alloc_region; | |
534 } | |
535 | |
536 // If could fit into free regions w/o expansion, try. | |
537 // Otherwise, if can expand, do so. | |
538 // Otherwise, if using ex regions might help, try with ex given back. | |
539 HeapWord* G1CollectedHeap::humongousObjAllocate(size_t word_size) { | |
540 assert(regions_accounted_for(), "Region leakage!"); | |
541 | |
542 // We can't allocate H regions while cleanupComplete is running, since | |
543 // some of the regions we find to be empty might not yet be added to the | |
544 // unclean list. (If we're already at a safepoint, this call is | |
545 // unnecessary, not to mention wrong.) | |
546 if (!SafepointSynchronize::is_at_safepoint()) | |
547 wait_for_cleanup_complete(); | |
548 | |
549 size_t num_regions = | |
550 round_to(word_size, HeapRegion::GrainWords) / HeapRegion::GrainWords; | |
551 | |
552 // Special case if < one region??? | |
553 | |
554 // Remember the ft size. | |
555 size_t x_size = expansion_regions(); | |
556 | |
557 HeapWord* res = NULL; | |
558 bool eliminated_allocated_from_lists = false; | |
559 | |
560 // Can the allocation potentially fit in the free regions? | |
561 if (free_regions() >= num_regions) { | |
562 res = _hrs->obj_allocate(word_size); | |
563 } | |
564 if (res == NULL) { | |
565 // Try expansion. | |
566 size_t fs = _hrs->free_suffix(); | |
567 if (fs + x_size >= num_regions) { | |
568 expand((num_regions - fs) * HeapRegion::GrainBytes); | |
569 res = _hrs->obj_allocate(word_size); | |
570 assert(res != NULL, "This should have worked."); | |
571 } else { | |
572 // Expansion won't help. Are there enough free regions if we get rid | |
573 // of reservations? | |
574 size_t avail = free_regions(); | |
575 if (avail >= num_regions) { | |
576 res = _hrs->obj_allocate(word_size); | |
577 if (res != NULL) { | |
578 remove_allocated_regions_from_lists(); | |
579 eliminated_allocated_from_lists = true; | |
580 } | |
581 } | |
582 } | |
583 } | |
584 if (res != NULL) { | |
585 // Increment by the number of regions allocated. | |
586 // FIXME: Assumes regions all of size GrainBytes. | |
587 #ifndef PRODUCT | |
588 mr_bs()->verify_clean_region(MemRegion(res, res + num_regions * | |
589 HeapRegion::GrainWords)); | |
590 #endif | |
591 if (!eliminated_allocated_from_lists) | |
592 remove_allocated_regions_from_lists(); | |
593 _summary_bytes_used += word_size * HeapWordSize; | |
594 _free_regions -= num_regions; | |
595 _num_humongous_regions += (int) num_regions; | |
596 } | |
597 assert(regions_accounted_for(), "Region Leakage"); | |
598 return res; | |
599 } | |
600 | |
601 HeapWord* | |
602 G1CollectedHeap::attempt_allocation_slow(size_t word_size, | |
603 bool permit_collection_pause) { | |
604 HeapWord* res = NULL; | |
605 HeapRegion* allocated_young_region = NULL; | |
606 | |
607 assert( SafepointSynchronize::is_at_safepoint() || | |
608 Heap_lock->owned_by_self(), "pre condition of the call" ); | |
609 | |
610 if (isHumongous(word_size)) { | |
611 // Allocation of a humongous object can, in a sense, complete a | |
612 // partial region, if the previous alloc was also humongous, and | |
613 // caused the test below to succeed. | |
614 if (permit_collection_pause) | |
615 do_collection_pause_if_appropriate(word_size); | |
616 res = humongousObjAllocate(word_size); | |
617 assert(_cur_alloc_region == NULL | |
618 || !_cur_alloc_region->isHumongous(), | |
619 "Prevent a regression of this bug."); | |
620 | |
621 } else { | |
354
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622 // We may have concurrent cleanup working at the time. Wait for it |
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623 // to complete. In the future we would probably want to make the |
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624 // concurrent cleanup truly concurrent by decoupling it from the |
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625 // allocation. |
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626 if (!SafepointSynchronize::is_at_safepoint()) |
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627 wait_for_cleanup_complete(); |
342 | 628 // If we do a collection pause, this will be reset to a non-NULL |
629 // value. If we don't, nulling here ensures that we allocate a new | |
630 // region below. | |
631 if (_cur_alloc_region != NULL) { | |
632 // We're finished with the _cur_alloc_region. | |
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633 // As we're builing (at least the young portion) of the collection |
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634 // set incrementally we'll add the current allocation region to |
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635 // the collection set here. |
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636 if (_cur_alloc_region->is_young()) { |
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637 g1_policy()->add_region_to_incremental_cset_lhs(_cur_alloc_region); |
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638 } |
342 | 639 _summary_bytes_used += _cur_alloc_region->used(); |
640 _cur_alloc_region = NULL; | |
641 } | |
642 assert(_cur_alloc_region == NULL, "Invariant."); | |
643 // Completion of a heap region is perhaps a good point at which to do | |
644 // a collection pause. | |
645 if (permit_collection_pause) | |
646 do_collection_pause_if_appropriate(word_size); | |
647 // Make sure we have an allocation region available. | |
648 if (_cur_alloc_region == NULL) { | |
649 if (!SafepointSynchronize::is_at_safepoint()) | |
650 wait_for_cleanup_complete(); | |
651 bool next_is_young = should_set_young_locked(); | |
652 // If the next region is not young, make sure it's zero-filled. | |
653 _cur_alloc_region = newAllocRegion(word_size, !next_is_young); | |
654 if (_cur_alloc_region != NULL) { | |
655 _summary_bytes_used -= _cur_alloc_region->used(); | |
656 if (next_is_young) { | |
657 set_region_short_lived_locked(_cur_alloc_region); | |
658 allocated_young_region = _cur_alloc_region; | |
659 } | |
660 } | |
661 } | |
662 assert(_cur_alloc_region == NULL || !_cur_alloc_region->isHumongous(), | |
663 "Prevent a regression of this bug."); | |
664 | |
665 // Now retry the allocation. | |
666 if (_cur_alloc_region != NULL) { | |
1666
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667 if (allocated_young_region != NULL) { |
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668 // We need to ensure that the store to top does not |
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669 // float above the setting of the young type. |
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670 OrderAccess::storestore(); |
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671 } |
342 | 672 res = _cur_alloc_region->allocate(word_size); |
673 } | |
674 } | |
675 | |
676 // NOTE: fails frequently in PRT | |
677 assert(regions_accounted_for(), "Region leakage!"); | |
678 | |
679 if (res != NULL) { | |
680 if (!SafepointSynchronize::is_at_safepoint()) { | |
681 assert( permit_collection_pause, "invariant" ); | |
682 assert( Heap_lock->owned_by_self(), "invariant" ); | |
683 Heap_lock->unlock(); | |
684 } | |
685 | |
686 if (allocated_young_region != NULL) { | |
687 HeapRegion* hr = allocated_young_region; | |
688 HeapWord* bottom = hr->bottom(); | |
689 HeapWord* end = hr->end(); | |
690 MemRegion mr(bottom, end); | |
691 ((CardTableModRefBS*)_g1h->barrier_set())->dirty(mr); | |
692 } | |
693 } | |
694 | |
695 assert( SafepointSynchronize::is_at_safepoint() || | |
696 (res == NULL && Heap_lock->owned_by_self()) || | |
697 (res != NULL && !Heap_lock->owned_by_self()), | |
698 "post condition of the call" ); | |
699 | |
700 return res; | |
701 } | |
702 | |
703 HeapWord* | |
704 G1CollectedHeap::mem_allocate(size_t word_size, | |
705 bool is_noref, | |
706 bool is_tlab, | |
707 bool* gc_overhead_limit_was_exceeded) { | |
708 debug_only(check_for_valid_allocation_state()); | |
709 assert(no_gc_in_progress(), "Allocation during gc not allowed"); | |
710 HeapWord* result = NULL; | |
711 | |
712 // Loop until the allocation is satisified, | |
713 // or unsatisfied after GC. | |
714 for (int try_count = 1; /* return or throw */; try_count += 1) { | |
715 int gc_count_before; | |
716 { | |
717 Heap_lock->lock(); | |
718 result = attempt_allocation(word_size); | |
719 if (result != NULL) { | |
720 // attempt_allocation should have unlocked the heap lock | |
721 assert(is_in(result), "result not in heap"); | |
722 return result; | |
723 } | |
724 // Read the gc count while the heap lock is held. | |
725 gc_count_before = SharedHeap::heap()->total_collections(); | |
726 Heap_lock->unlock(); | |
727 } | |
728 | |
729 // Create the garbage collection operation... | |
730 VM_G1CollectForAllocation op(word_size, | |
731 gc_count_before); | |
732 | |
733 // ...and get the VM thread to execute it. | |
734 VMThread::execute(&op); | |
735 if (op.prologue_succeeded()) { | |
736 result = op.result(); | |
737 assert(result == NULL || is_in(result), "result not in heap"); | |
738 return result; | |
739 } | |
740 | |
741 // Give a warning if we seem to be looping forever. | |
742 if ((QueuedAllocationWarningCount > 0) && | |
743 (try_count % QueuedAllocationWarningCount == 0)) { | |
744 warning("G1CollectedHeap::mem_allocate_work retries %d times", | |
745 try_count); | |
746 } | |
747 } | |
748 } | |
749 | |
750 void G1CollectedHeap::abandon_cur_alloc_region() { | |
751 if (_cur_alloc_region != NULL) { | |
752 // We're finished with the _cur_alloc_region. | |
753 if (_cur_alloc_region->is_empty()) { | |
754 _free_regions++; | |
755 free_region(_cur_alloc_region); | |
756 } else { | |
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757 // As we're builing (at least the young portion) of the collection |
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758 // set incrementally we'll add the current allocation region to |
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759 // the collection set here. |
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760 if (_cur_alloc_region->is_young()) { |
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761 g1_policy()->add_region_to_incremental_cset_lhs(_cur_alloc_region); |
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762 } |
342 | 763 _summary_bytes_used += _cur_alloc_region->used(); |
764 } | |
765 _cur_alloc_region = NULL; | |
766 } | |
767 } | |
768 | |
636 | 769 void G1CollectedHeap::abandon_gc_alloc_regions() { |
770 // first, make sure that the GC alloc region list is empty (it should!) | |
771 assert(_gc_alloc_region_list == NULL, "invariant"); | |
772 release_gc_alloc_regions(true /* totally */); | |
773 } | |
774 | |
342 | 775 class PostMCRemSetClearClosure: public HeapRegionClosure { |
776 ModRefBarrierSet* _mr_bs; | |
777 public: | |
778 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
779 bool doHeapRegion(HeapRegion* r) { | |
780 r->reset_gc_time_stamp(); | |
781 if (r->continuesHumongous()) | |
782 return false; | |
783 HeapRegionRemSet* hrrs = r->rem_set(); | |
784 if (hrrs != NULL) hrrs->clear(); | |
785 // You might think here that we could clear just the cards | |
786 // corresponding to the used region. But no: if we leave a dirty card | |
787 // in a region we might allocate into, then it would prevent that card | |
788 // from being enqueued, and cause it to be missed. | |
789 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
790 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
791 return false; | |
792 } | |
793 }; | |
794 | |
795 | |
796 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
797 ModRefBarrierSet* _mr_bs; | |
798 public: | |
799 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
800 bool doHeapRegion(HeapRegion* r) { | |
801 if (r->continuesHumongous()) return false; | |
802 if (r->used_region().word_size() != 0) { | |
803 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
804 } | |
805 return false; | |
806 } | |
807 }; | |
808 | |
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809 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
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810 G1CollectedHeap* _g1h; |
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811 UpdateRSOopClosure _cl; |
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812 int _worker_i; |
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813 public: |
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814 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
1861 | 815 _cl(g1->g1_rem_set(), worker_i), |
626
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816 _worker_i(worker_i), |
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817 _g1h(g1) |
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818 { } |
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819 |
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820 bool doHeapRegion(HeapRegion* r) { |
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821 if (!r->continuesHumongous()) { |
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822 _cl.set_from(r); |
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823 r->oop_iterate(&_cl); |
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824 } |
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825 return false; |
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826 } |
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827 }; |
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828 |
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829 class ParRebuildRSTask: public AbstractGangTask { |
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830 G1CollectedHeap* _g1; |
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831 public: |
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832 ParRebuildRSTask(G1CollectedHeap* g1) |
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833 : AbstractGangTask("ParRebuildRSTask"), |
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834 _g1(g1) |
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835 { } |
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836 |
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837 void work(int i) { |
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838 RebuildRSOutOfRegionClosure rebuild_rs(_g1, i); |
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839 _g1->heap_region_par_iterate_chunked(&rebuild_rs, i, |
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840 HeapRegion::RebuildRSClaimValue); |
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841 } |
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842 }; |
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843 |
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844 void G1CollectedHeap::do_collection(bool explicit_gc, |
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845 bool clear_all_soft_refs, |
342 | 846 size_t word_size) { |
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847 if (GC_locker::check_active_before_gc()) { |
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848 return; // GC is disabled (e.g. JNI GetXXXCritical operation) |
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849 } |
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850 |
342 | 851 ResourceMark rm; |
852 | |
838
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853 if (PrintHeapAtGC) { |
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854 Universe::print_heap_before_gc(); |
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855 } |
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856 |
342 | 857 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); |
858 assert(Thread::current() == VMThread::vm_thread(), "should be in vm thread"); | |
859 | |
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860 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
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861 collector_policy()->should_clear_all_soft_refs(); |
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862 |
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863 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
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864 |
342 | 865 { |
866 IsGCActiveMark x; | |
867 | |
868 // Timing | |
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869 bool system_gc = (gc_cause() == GCCause::_java_lang_system_gc); |
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870 assert(!system_gc || explicit_gc, "invariant"); |
342 | 871 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
872 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
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873 TraceTime t(system_gc ? "Full GC (System.gc())" : "Full GC", |
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874 PrintGC, true, gclog_or_tty); |
342 | 875 |
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876 TraceMemoryManagerStats tms(true /* fullGC */); |
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877 |
342 | 878 double start = os::elapsedTime(); |
879 g1_policy()->record_full_collection_start(); | |
880 | |
881 gc_prologue(true); | |
838
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882 increment_total_collections(true /* full gc */); |
342 | 883 |
884 size_t g1h_prev_used = used(); | |
885 assert(used() == recalculate_used(), "Should be equal"); | |
886 | |
887 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
888 HandleMark hm; // Discard invalid handles created during verification | |
889 prepare_for_verify(); | |
890 gclog_or_tty->print(" VerifyBeforeGC:"); | |
891 Universe::verify(true); | |
892 } | |
893 assert(regions_accounted_for(), "Region leakage!"); | |
894 | |
895 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
896 | |
897 // We want to discover references, but not process them yet. | |
898 // This mode is disabled in | |
899 // instanceRefKlass::process_discovered_references if the | |
900 // generation does some collection work, or | |
901 // instanceRefKlass::enqueue_discovered_references if the | |
902 // generation returns without doing any work. | |
903 ref_processor()->disable_discovery(); | |
904 ref_processor()->abandon_partial_discovery(); | |
905 ref_processor()->verify_no_references_recorded(); | |
906 | |
907 // Abandon current iterations of concurrent marking and concurrent | |
908 // refinement, if any are in progress. | |
909 concurrent_mark()->abort(); | |
910 | |
911 // Make sure we'll choose a new allocation region afterwards. | |
912 abandon_cur_alloc_region(); | |
636 | 913 abandon_gc_alloc_regions(); |
342 | 914 assert(_cur_alloc_region == NULL, "Invariant."); |
1861 | 915 g1_rem_set()->cleanupHRRS(); |
342 | 916 tear_down_region_lists(); |
917 set_used_regions_to_need_zero_fill(); | |
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918 |
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919 // We may have added regions to the current incremental collection |
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920 // set between the last GC or pause and now. We need to clear the |
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921 // incremental collection set and then start rebuilding it afresh |
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922 // after this full GC. |
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923 abandon_collection_set(g1_policy()->inc_cset_head()); |
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924 g1_policy()->clear_incremental_cset(); |
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925 g1_policy()->stop_incremental_cset_building(); |
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926 |
342 | 927 if (g1_policy()->in_young_gc_mode()) { |
928 empty_young_list(); | |
929 g1_policy()->set_full_young_gcs(true); | |
930 } | |
931 | |
932 // Temporarily make reference _discovery_ single threaded (non-MT). | |
933 ReferenceProcessorMTMutator rp_disc_ser(ref_processor(), false); | |
934 | |
935 // Temporarily make refs discovery atomic | |
936 ReferenceProcessorAtomicMutator rp_disc_atomic(ref_processor(), true); | |
937 | |
938 // Temporarily clear _is_alive_non_header | |
939 ReferenceProcessorIsAliveMutator rp_is_alive_null(ref_processor(), NULL); | |
940 | |
941 ref_processor()->enable_discovery(); | |
1387
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942 ref_processor()->setup_policy(do_clear_all_soft_refs); |
342 | 943 |
944 // Do collection work | |
945 { | |
946 HandleMark hm; // Discard invalid handles created during gc | |
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947 G1MarkSweep::invoke_at_safepoint(ref_processor(), do_clear_all_soft_refs); |
342 | 948 } |
949 // Because freeing humongous regions may have added some unclean | |
950 // regions, it is necessary to tear down again before rebuilding. | |
951 tear_down_region_lists(); | |
952 rebuild_region_lists(); | |
953 | |
954 _summary_bytes_used = recalculate_used(); | |
955 | |
956 ref_processor()->enqueue_discovered_references(); | |
957 | |
958 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
959 | |
1089
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960 MemoryService::track_memory_usage(); |
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961 |
342 | 962 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
963 HandleMark hm; // Discard invalid handles created during verification | |
964 gclog_or_tty->print(" VerifyAfterGC:"); | |
637
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965 prepare_for_verify(); |
342 | 966 Universe::verify(false); |
967 } | |
968 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); | |
969 | |
970 reset_gc_time_stamp(); | |
971 // Since everything potentially moved, we will clear all remembered | |
626
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972 // sets, and clear all cards. Later we will rebuild remebered |
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973 // sets. We will also reset the GC time stamps of the regions. |
342 | 974 PostMCRemSetClearClosure rs_clear(mr_bs()); |
975 heap_region_iterate(&rs_clear); | |
976 | |
977 // Resize the heap if necessary. | |
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978 resize_if_necessary_after_full_collection(explicit_gc ? 0 : word_size); |
342 | 979 |
980 if (_cg1r->use_cache()) { | |
981 _cg1r->clear_and_record_card_counts(); | |
982 _cg1r->clear_hot_cache(); | |
983 } | |
984 | |
626
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985 // Rebuild remembered sets of all regions. |
1833
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986 |
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987 if (G1CollectedHeap::use_parallel_gc_threads()) { |
626
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988 ParRebuildRSTask rebuild_rs_task(this); |
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989 assert(check_heap_region_claim_values( |
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990 HeapRegion::InitialClaimValue), "sanity check"); |
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991 set_par_threads(workers()->total_workers()); |
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992 workers()->run_task(&rebuild_rs_task); |
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993 set_par_threads(0); |
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994 assert(check_heap_region_claim_values( |
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995 HeapRegion::RebuildRSClaimValue), "sanity check"); |
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996 reset_heap_region_claim_values(); |
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997 } else { |
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998 RebuildRSOutOfRegionClosure rebuild_rs(this); |
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999 heap_region_iterate(&rebuild_rs); |
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1000 } |
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1001 |
342 | 1002 if (PrintGC) { |
1003 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); | |
1004 } | |
1005 | |
1006 if (true) { // FIXME | |
1007 // Ask the permanent generation to adjust size for full collections | |
1008 perm()->compute_new_size(); | |
1009 } | |
1010 | |
1394
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1011 // Start a new incremental collection set for the next pause |
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1012 assert(g1_policy()->collection_set() == NULL, "must be"); |
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1013 g1_policy()->start_incremental_cset_building(); |
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1014 |
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1015 // Clear the _cset_fast_test bitmap in anticipation of adding |
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1016 // regions to the incremental collection set for the next |
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1017 // evacuation pause. |
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1018 clear_cset_fast_test(); |
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1019 |
342 | 1020 double end = os::elapsedTime(); |
1021 g1_policy()->record_full_collection_end(); | |
1022 | |
546
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1023 #ifdef TRACESPINNING |
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1024 ParallelTaskTerminator::print_termination_counts(); |
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1025 #endif |
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1026 |
342 | 1027 gc_epilogue(true); |
1028 | |
794 | 1029 // Discard all rset updates |
1030 JavaThread::dirty_card_queue_set().abandon_logs(); | |
616
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1031 assert(!G1DeferredRSUpdate |
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1032 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
342 | 1033 assert(regions_accounted_for(), "Region leakage!"); |
1034 } | |
1035 | |
1036 if (g1_policy()->in_young_gc_mode()) { | |
1037 _young_list->reset_sampled_info(); | |
1394
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1038 // At this point there should be no regions in the |
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1039 // entire heap tagged as young. |
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1040 assert( check_young_list_empty(true /* check_heap */), |
342 | 1041 "young list should be empty at this point"); |
1042 } | |
838
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1043 |
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1044 // Update the number of full collections that have been completed. |
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1045 increment_full_collections_completed(false /* outer */); |
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1046 |
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1047 if (PrintHeapAtGC) { |
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1048 Universe::print_heap_after_gc(); |
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1049 } |
342 | 1050 } |
1051 | |
1052 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
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1053 do_collection(true, /* explicit_gc */ |
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1054 clear_all_soft_refs, |
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1055 0 /* word_size */); |
342 | 1056 } |
1057 | |
1058 // This code is mostly copied from TenuredGeneration. | |
1059 void | |
1060 G1CollectedHeap:: | |
1061 resize_if_necessary_after_full_collection(size_t word_size) { | |
1062 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
1063 | |
1064 // Include the current allocation, if any, and bytes that will be | |
1065 // pre-allocated to support collections, as "used". | |
1066 const size_t used_after_gc = used(); | |
1067 const size_t capacity_after_gc = capacity(); | |
1068 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
1069 | |
1717
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1070 // This is enforced in arguments.cpp. |
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1071 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, |
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1072 "otherwise the code below doesn't make sense"); |
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1073 |
342 | 1074 // We don't have floating point command-line arguments |
1717
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1075 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100.0; |
342 | 1076 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
1717
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1077 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100.0; |
342 | 1078 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
1079 | |
1717
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1080 const size_t min_heap_size = collector_policy()->min_heap_byte_size(); |
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1081 const size_t max_heap_size = collector_policy()->max_heap_byte_size(); |
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1082 |
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1083 // We have to be careful here as these two calculations can overflow |
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1084 // 32-bit size_t's. |
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1085 double used_after_gc_d = (double) used_after_gc; |
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1086 double minimum_desired_capacity_d = used_after_gc_d / maximum_used_percentage; |
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1087 double maximum_desired_capacity_d = used_after_gc_d / minimum_used_percentage; |
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1088 |
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1089 // Let's make sure that they are both under the max heap size, which |
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1090 // by default will make them fit into a size_t. |
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1091 double desired_capacity_upper_bound = (double) max_heap_size; |
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1092 minimum_desired_capacity_d = MIN2(minimum_desired_capacity_d, |
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1093 desired_capacity_upper_bound); |
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1094 maximum_desired_capacity_d = MIN2(maximum_desired_capacity_d, |
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1095 desired_capacity_upper_bound); |
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1096 |
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1097 // We can now safely turn them into size_t's. |
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1098 size_t minimum_desired_capacity = (size_t) minimum_desired_capacity_d; |
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1099 size_t maximum_desired_capacity = (size_t) maximum_desired_capacity_d; |
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1100 |
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1101 // This assert only makes sense here, before we adjust them |
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1102 // with respect to the min and max heap size. |
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1103 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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1104 err_msg("minimum_desired_capacity = "SIZE_FORMAT", " |
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1105 "maximum_desired_capacity = "SIZE_FORMAT, |
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1106 minimum_desired_capacity, maximum_desired_capacity)); |
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1107 |
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1108 // Should not be greater than the heap max size. No need to adjust |
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1109 // it with respect to the heap min size as it's a lower bound (i.e., |
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1110 // we'll try to make the capacity larger than it, not smaller). |
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1111 minimum_desired_capacity = MIN2(minimum_desired_capacity, max_heap_size); |
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1112 // Should not be less than the heap min size. No need to adjust it |
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1113 // with respect to the heap max size as it's an upper bound (i.e., |
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1114 // we'll try to make the capacity smaller than it, not greater). |
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1115 maximum_desired_capacity = MAX2(maximum_desired_capacity, min_heap_size); |
342 | 1116 |
1117 if (PrintGC && Verbose) { | |
1717
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1118 const double free_percentage = |
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1119 (double) free_after_gc / (double) capacity_after_gc; |
342 | 1120 gclog_or_tty->print_cr("Computing new size after full GC "); |
1121 gclog_or_tty->print_cr(" " | |
1122 " minimum_free_percentage: %6.2f", | |
1123 minimum_free_percentage); | |
1124 gclog_or_tty->print_cr(" " | |
1125 " maximum_free_percentage: %6.2f", | |
1126 maximum_free_percentage); | |
1127 gclog_or_tty->print_cr(" " | |
1128 " capacity: %6.1fK" | |
1129 " minimum_desired_capacity: %6.1fK" | |
1130 " maximum_desired_capacity: %6.1fK", | |
1717
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1131 (double) capacity_after_gc / (double) K, |
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1132 (double) minimum_desired_capacity / (double) K, |
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1133 (double) maximum_desired_capacity / (double) K); |
342 | 1134 gclog_or_tty->print_cr(" " |
1717
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1135 " free_after_gc: %6.1fK" |
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1136 " used_after_gc: %6.1fK", |
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1137 (double) free_after_gc / (double) K, |
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1138 (double) used_after_gc / (double) K); |
342 | 1139 gclog_or_tty->print_cr(" " |
1140 " free_percentage: %6.2f", | |
1141 free_percentage); | |
1142 } | |
1717
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1143 if (capacity_after_gc < minimum_desired_capacity) { |
342 | 1144 // Don't expand unless it's significant |
1145 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
1146 expand(expand_bytes); | |
1147 if (PrintGC && Verbose) { | |
1717
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1148 gclog_or_tty->print_cr(" " |
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1149 " expanding:" |
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1150 " max_heap_size: %6.1fK" |
342 | 1151 " minimum_desired_capacity: %6.1fK" |
1152 " expand_bytes: %6.1fK", | |
1717
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1153 (double) max_heap_size / (double) K, |
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1154 (double) minimum_desired_capacity / (double) K, |
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1155 (double) expand_bytes / (double) K); |
342 | 1156 } |
1157 | |
1158 // No expansion, now see if we want to shrink | |
1717
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1159 } else if (capacity_after_gc > maximum_desired_capacity) { |
342 | 1160 // Capacity too large, compute shrinking size |
1161 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
1162 shrink(shrink_bytes); | |
1163 if (PrintGC && Verbose) { | |
1164 gclog_or_tty->print_cr(" " | |
1165 " shrinking:" | |
1717
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1166 " min_heap_size: %6.1fK" |
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1167 " maximum_desired_capacity: %6.1fK" |
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1168 " shrink_bytes: %6.1fK", |
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1169 (double) min_heap_size / (double) K, |
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1170 (double) maximum_desired_capacity / (double) K, |
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1171 (double) shrink_bytes / (double) K); |
342 | 1172 } |
1173 } | |
1174 } | |
1175 | |
1176 | |
1177 HeapWord* | |
1178 G1CollectedHeap::satisfy_failed_allocation(size_t word_size) { | |
1179 HeapWord* result = NULL; | |
1180 | |
1181 // In a G1 heap, we're supposed to keep allocation from failing by | |
1182 // incremental pauses. Therefore, at least for now, we'll favor | |
1183 // expansion over collection. (This might change in the future if we can | |
1184 // do something smarter than full collection to satisfy a failed alloc.) | |
1185 | |
1186 result = expand_and_allocate(word_size); | |
1187 if (result != NULL) { | |
1188 assert(is_in(result), "result not in heap"); | |
1189 return result; | |
1190 } | |
1191 | |
1192 // OK, I guess we have to try collection. | |
1193 | |
1194 do_collection(false, false, word_size); | |
1195 | |
1196 result = attempt_allocation(word_size, /*permit_collection_pause*/false); | |
1197 | |
1198 if (result != NULL) { | |
1199 assert(is_in(result), "result not in heap"); | |
1200 return result; | |
1201 } | |
1202 | |
1203 // Try collecting soft references. | |
1204 do_collection(false, true, word_size); | |
1205 result = attempt_allocation(word_size, /*permit_collection_pause*/false); | |
1206 if (result != NULL) { | |
1207 assert(is_in(result), "result not in heap"); | |
1208 return result; | |
1209 } | |
1210 | |
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1211 assert(!collector_policy()->should_clear_all_soft_refs(), |
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1212 "Flag should have been handled and cleared prior to this point"); |
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1213 |
342 | 1214 // What else? We might try synchronous finalization later. If the total |
1215 // space available is large enough for the allocation, then a more | |
1216 // complete compaction phase than we've tried so far might be | |
1217 // appropriate. | |
1218 return NULL; | |
1219 } | |
1220 | |
1221 // Attempting to expand the heap sufficiently | |
1222 // to support an allocation of the given "word_size". If | |
1223 // successful, perform the allocation and return the address of the | |
1224 // allocated block, or else "NULL". | |
1225 | |
1226 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
1227 size_t expand_bytes = word_size * HeapWordSize; | |
1228 if (expand_bytes < MinHeapDeltaBytes) { | |
1229 expand_bytes = MinHeapDeltaBytes; | |
1230 } | |
1231 expand(expand_bytes); | |
1232 assert(regions_accounted_for(), "Region leakage!"); | |
1233 HeapWord* result = attempt_allocation(word_size, false /* permit_collection_pause */); | |
1234 return result; | |
1235 } | |
1236 | |
1237 size_t G1CollectedHeap::free_region_if_totally_empty(HeapRegion* hr) { | |
1238 size_t pre_used = 0; | |
1239 size_t cleared_h_regions = 0; | |
1240 size_t freed_regions = 0; | |
1241 UncleanRegionList local_list; | |
1242 free_region_if_totally_empty_work(hr, pre_used, cleared_h_regions, | |
1243 freed_regions, &local_list); | |
1244 | |
1245 finish_free_region_work(pre_used, cleared_h_regions, freed_regions, | |
1246 &local_list); | |
1247 return pre_used; | |
1248 } | |
1249 | |
1250 void | |
1251 G1CollectedHeap::free_region_if_totally_empty_work(HeapRegion* hr, | |
1252 size_t& pre_used, | |
1253 size_t& cleared_h, | |
1254 size_t& freed_regions, | |
1255 UncleanRegionList* list, | |
1256 bool par) { | |
1257 assert(!hr->continuesHumongous(), "should have filtered these out"); | |
1258 size_t res = 0; | |
677 | 1259 if (hr->used() > 0 && hr->garbage_bytes() == hr->used() && |
1260 !hr->is_young()) { | |
1261 if (G1PolicyVerbose > 0) | |
1262 gclog_or_tty->print_cr("Freeing empty region "PTR_FORMAT "(" SIZE_FORMAT " bytes)" | |
1263 " during cleanup", hr, hr->used()); | |
1264 free_region_work(hr, pre_used, cleared_h, freed_regions, list, par); | |
342 | 1265 } |
1266 } | |
1267 | |
1268 // FIXME: both this and shrink could probably be more efficient by | |
1269 // doing one "VirtualSpace::expand_by" call rather than several. | |
1270 void G1CollectedHeap::expand(size_t expand_bytes) { | |
1271 size_t old_mem_size = _g1_storage.committed_size(); | |
1272 // We expand by a minimum of 1K. | |
1273 expand_bytes = MAX2(expand_bytes, (size_t)K); | |
1274 size_t aligned_expand_bytes = | |
1275 ReservedSpace::page_align_size_up(expand_bytes); | |
1276 aligned_expand_bytes = align_size_up(aligned_expand_bytes, | |
1277 HeapRegion::GrainBytes); | |
1278 expand_bytes = aligned_expand_bytes; | |
1279 while (expand_bytes > 0) { | |
1280 HeapWord* base = (HeapWord*)_g1_storage.high(); | |
1281 // Commit more storage. | |
1282 bool successful = _g1_storage.expand_by(HeapRegion::GrainBytes); | |
1283 if (!successful) { | |
1284 expand_bytes = 0; | |
1285 } else { | |
1286 expand_bytes -= HeapRegion::GrainBytes; | |
1287 // Expand the committed region. | |
1288 HeapWord* high = (HeapWord*) _g1_storage.high(); | |
1289 _g1_committed.set_end(high); | |
1290 // Create a new HeapRegion. | |
1291 MemRegion mr(base, high); | |
1292 bool is_zeroed = !_g1_max_committed.contains(base); | |
1293 HeapRegion* hr = new HeapRegion(_bot_shared, mr, is_zeroed); | |
1294 | |
1295 // Now update max_committed if necessary. | |
1296 _g1_max_committed.set_end(MAX2(_g1_max_committed.end(), high)); | |
1297 | |
1298 // Add it to the HeapRegionSeq. | |
1299 _hrs->insert(hr); | |
1300 // Set the zero-fill state, according to whether it's already | |
1301 // zeroed. | |
1302 { | |
1303 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
1304 if (is_zeroed) { | |
1305 hr->set_zero_fill_complete(); | |
1306 put_free_region_on_list_locked(hr); | |
1307 } else { | |
1308 hr->set_zero_fill_needed(); | |
1309 put_region_on_unclean_list_locked(hr); | |
1310 } | |
1311 } | |
1312 _free_regions++; | |
1313 // And we used up an expansion region to create it. | |
1314 _expansion_regions--; | |
1315 // Tell the cardtable about it. | |
1316 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
1317 // And the offset table as well. | |
1318 _bot_shared->resize(_g1_committed.word_size()); | |
1319 } | |
1320 } | |
1321 if (Verbose && PrintGC) { | |
1322 size_t new_mem_size = _g1_storage.committed_size(); | |
1323 gclog_or_tty->print_cr("Expanding garbage-first heap from %ldK by %ldK to %ldK", | |
1324 old_mem_size/K, aligned_expand_bytes/K, | |
1325 new_mem_size/K); | |
1326 } | |
1327 } | |
1328 | |
1329 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) | |
1330 { | |
1331 size_t old_mem_size = _g1_storage.committed_size(); | |
1332 size_t aligned_shrink_bytes = | |
1333 ReservedSpace::page_align_size_down(shrink_bytes); | |
1334 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
1335 HeapRegion::GrainBytes); | |
1336 size_t num_regions_deleted = 0; | |
1337 MemRegion mr = _hrs->shrink_by(aligned_shrink_bytes, num_regions_deleted); | |
1338 | |
1339 assert(mr.end() == (HeapWord*)_g1_storage.high(), "Bad shrink!"); | |
1340 if (mr.byte_size() > 0) | |
1341 _g1_storage.shrink_by(mr.byte_size()); | |
1342 assert(mr.start() == (HeapWord*)_g1_storage.high(), "Bad shrink!"); | |
1343 | |
1344 _g1_committed.set_end(mr.start()); | |
1345 _free_regions -= num_regions_deleted; | |
1346 _expansion_regions += num_regions_deleted; | |
1347 | |
1348 // Tell the cardtable about it. | |
1349 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
1350 | |
1351 // And the offset table as well. | |
1352 _bot_shared->resize(_g1_committed.word_size()); | |
1353 | |
1354 HeapRegionRemSet::shrink_heap(n_regions()); | |
1355 | |
1356 if (Verbose && PrintGC) { | |
1357 size_t new_mem_size = _g1_storage.committed_size(); | |
1358 gclog_or_tty->print_cr("Shrinking garbage-first heap from %ldK by %ldK to %ldK", | |
1359 old_mem_size/K, aligned_shrink_bytes/K, | |
1360 new_mem_size/K); | |
1361 } | |
1362 } | |
1363 | |
1364 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
636 | 1365 release_gc_alloc_regions(true /* totally */); |
342 | 1366 tear_down_region_lists(); // We will rebuild them in a moment. |
1367 shrink_helper(shrink_bytes); | |
1368 rebuild_region_lists(); | |
1369 } | |
1370 | |
1371 // Public methods. | |
1372 | |
1373 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
1374 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
1375 #endif // _MSC_VER | |
1376 | |
1377 | |
1378 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
1379 SharedHeap(policy_), | |
1380 _g1_policy(policy_), | |
1111 | 1381 _dirty_card_queue_set(false), |
1705 | 1382 _into_cset_dirty_card_queue_set(false), |
342 | 1383 _ref_processor(NULL), |
1384 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), | |
1385 _bot_shared(NULL), | |
1386 _par_alloc_during_gc_lock(Mutex::leaf, "par alloc during GC lock"), | |
1387 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
1388 _evac_failure_scan_stack(NULL) , | |
1389 _mark_in_progress(false), | |
1390 _cg1r(NULL), _czft(NULL), _summary_bytes_used(0), | |
1391 _cur_alloc_region(NULL), | |
1392 _refine_cte_cl(NULL), | |
1393 _free_region_list(NULL), _free_region_list_size(0), | |
1394 _free_regions(0), | |
1395 _full_collection(false), | |
1396 _unclean_region_list(), | |
1397 _unclean_regions_coming(false), | |
1398 _young_list(new YoungList(this)), | |
1399 _gc_time_stamp(0), | |
526 | 1400 _surviving_young_words(NULL), |
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1401 _full_collections_completed(0), |
526 | 1402 _in_cset_fast_test(NULL), |
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1403 _in_cset_fast_test_base(NULL), |
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1404 _dirty_cards_region_list(NULL) { |
342 | 1405 _g1h = this; // To catch bugs. |
1406 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
1407 vm_exit_during_initialization("Failed necessary allocation."); | |
1408 } | |
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1409 |
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1410 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1411 |
342 | 1412 int n_queues = MAX2((int)ParallelGCThreads, 1); |
1413 _task_queues = new RefToScanQueueSet(n_queues); | |
1414 | |
1415 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
1416 assert(n_rem_sets > 0, "Invariant."); | |
1417 | |
1418 HeapRegionRemSetIterator** iter_arr = | |
1419 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
1420 for (int i = 0; i < n_queues; i++) { | |
1421 iter_arr[i] = new HeapRegionRemSetIterator(); | |
1422 } | |
1423 _rem_set_iterator = iter_arr; | |
1424 | |
1425 for (int i = 0; i < n_queues; i++) { | |
1426 RefToScanQueue* q = new RefToScanQueue(); | |
1427 q->initialize(); | |
1428 _task_queues->register_queue(i, q); | |
1429 } | |
1430 | |
1431 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
636 | 1432 _gc_alloc_regions[ap] = NULL; |
1433 _gc_alloc_region_counts[ap] = 0; | |
1434 _retained_gc_alloc_regions[ap] = NULL; | |
1435 // by default, we do not retain a GC alloc region for each ap; | |
1436 // we'll override this, when appropriate, below | |
1437 _retain_gc_alloc_region[ap] = false; | |
1438 } | |
1439 | |
1440 // We will try to remember the last half-full tenured region we | |
1441 // allocated to at the end of a collection so that we can re-use it | |
1442 // during the next collection. | |
1443 _retain_gc_alloc_region[GCAllocForTenured] = true; | |
1444 | |
342 | 1445 guarantee(_task_queues != NULL, "task_queues allocation failure."); |
1446 } | |
1447 | |
1448 jint G1CollectedHeap::initialize() { | |
1166 | 1449 CollectedHeap::pre_initialize(); |
342 | 1450 os::enable_vtime(); |
1451 | |
1452 // Necessary to satisfy locking discipline assertions. | |
1453 | |
1454 MutexLocker x(Heap_lock); | |
1455 | |
1456 // While there are no constraints in the GC code that HeapWordSize | |
1457 // be any particular value, there are multiple other areas in the | |
1458 // system which believe this to be true (e.g. oop->object_size in some | |
1459 // cases incorrectly returns the size in wordSize units rather than | |
1460 // HeapWordSize). | |
1461 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
1462 | |
1463 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
1464 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
1465 | |
1466 // Ensure that the sizes are properly aligned. | |
1467 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
1468 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
1469 | |
1470 _cg1r = new ConcurrentG1Refine(); | |
1471 | |
1472 // Reserve the maximum. | |
1473 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
1474 // Includes the perm-gen. | |
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1476 const size_t total_reserved = max_byte_size + pgs->max_size(); |
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1477 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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1478 |
342 | 1479 ReservedSpace heap_rs(max_byte_size + pgs->max_size(), |
1480 HeapRegion::GrainBytes, | |
642
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1481 false /*ism*/, addr); |
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1482 |
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1483 if (UseCompressedOops) { |
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1484 if (addr != NULL && !heap_rs.is_reserved()) { |
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1485 // Failed to reserve at specified address - the requested memory |
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1486 // region is taken already, for example, by 'java' launcher. |
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1487 // Try again to reserver heap higher. |
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1488 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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1489 ReservedSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
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1490 false /*ism*/, addr); |
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1491 if (addr != NULL && !heap_rs0.is_reserved()) { |
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1492 // Failed to reserve at specified address again - give up. |
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1493 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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1494 assert(addr == NULL, ""); |
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1495 ReservedSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
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1496 false /*ism*/, addr); |
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1497 heap_rs = heap_rs1; |
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1498 } else { |
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1499 heap_rs = heap_rs0; |
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1500 } |
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1501 } |
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1502 } |
342 | 1503 |
1504 if (!heap_rs.is_reserved()) { | |
1505 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
1506 return JNI_ENOMEM; | |
1507 } | |
1508 | |
1509 // It is important to do this in a way such that concurrent readers can't | |
1510 // temporarily think somethings in the heap. (I've actually seen this | |
1511 // happen in asserts: DLD.) | |
1512 _reserved.set_word_size(0); | |
1513 _reserved.set_start((HeapWord*)heap_rs.base()); | |
1514 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
1515 | |
1516 _expansion_regions = max_byte_size/HeapRegion::GrainBytes; | |
1517 | |
1518 _num_humongous_regions = 0; | |
1519 | |
1520 // Create the gen rem set (and barrier set) for the entire reserved region. | |
1521 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
1522 set_barrier_set(rem_set()->bs()); | |
1523 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
1524 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
1525 } else { | |
1526 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
1527 return JNI_ENOMEM; | |
1528 } | |
1529 | |
1530 // Also create a G1 rem set. | |
1861 | 1531 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { |
1532 _g1_rem_set = new G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
342 | 1533 } else { |
1861 | 1534 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); |
1535 return JNI_ENOMEM; | |
342 | 1536 } |
1537 | |
1538 // Carve out the G1 part of the heap. | |
1539 | |
1540 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
1541 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
1542 g1_rs.size()/HeapWordSize); | |
1543 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
1544 | |
1545 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
1546 | |
1547 _g1_storage.initialize(g1_rs, 0); | |
1548 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
1549 _g1_max_committed = _g1_committed; | |
393 | 1550 _hrs = new HeapRegionSeq(_expansion_regions); |
342 | 1551 guarantee(_hrs != NULL, "Couldn't allocate HeapRegionSeq"); |
1552 guarantee(_cur_alloc_region == NULL, "from constructor"); | |
1553 | |
807
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1554 // 6843694 - ensure that the maximum region index can fit |
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1555 // in the remembered set structures. |
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1556 const size_t max_region_idx = ((size_t)1 << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
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1557 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
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1558 |
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1559 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
942
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1560 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
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1561 guarantee((size_t) HeapRegion::CardsPerRegion < max_cards_per_region, |
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1562 "too many cards per region"); |
807
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1563 |
342 | 1564 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
1565 heap_word_size(init_byte_size)); | |
1566 | |
1567 _g1h = this; | |
1568 | |
1394
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1569 _in_cset_fast_test_length = max_regions(); |
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1570 _in_cset_fast_test_base = NEW_C_HEAP_ARRAY(bool, _in_cset_fast_test_length); |
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1571 |
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1572 // We're biasing _in_cset_fast_test to avoid subtracting the |
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1573 // beginning of the heap every time we want to index; basically |
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1574 // it's the same with what we do with the card table. |
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1575 _in_cset_fast_test = _in_cset_fast_test_base - |
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1576 ((size_t) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
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1577 |
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1578 // Clear the _cset_fast_test bitmap in anticipation of adding |
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1579 // regions to the incremental collection set for the first |
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1580 // evacuation pause. |
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1581 clear_cset_fast_test(); |
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1582 |
342 | 1583 // Create the ConcurrentMark data structure and thread. |
1584 // (Must do this late, so that "max_regions" is defined.) | |
1585 _cm = new ConcurrentMark(heap_rs, (int) max_regions()); | |
1586 _cmThread = _cm->cmThread(); | |
1587 | |
1588 // ...and the concurrent zero-fill thread, if necessary. | |
1589 if (G1ConcZeroFill) { | |
1590 _czft = new ConcurrentZFThread(); | |
1591 } | |
1592 | |
1593 // Initialize the from_card cache structure of HeapRegionRemSet. | |
1594 HeapRegionRemSet::init_heap(max_regions()); | |
1595 | |
677 | 1596 // Now expand into the initial heap size. |
1597 expand(init_byte_size); | |
342 | 1598 |
1599 // Perform any initialization actions delegated to the policy. | |
1600 g1_policy()->init(); | |
1601 | |
1602 g1_policy()->note_start_of_mark_thread(); | |
1603 | |
1604 _refine_cte_cl = | |
1605 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
1606 g1_rem_set(), | |
1607 concurrent_g1_refine()); | |
1608 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
1609 | |
1610 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
1611 SATB_Q_FL_lock, | |
1111 | 1612 G1SATBProcessCompletedThreshold, |
342 | 1613 Shared_SATB_Q_lock); |
794 | 1614 |
1615 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
1616 DirtyCardQ_FL_lock, | |
1111 | 1617 concurrent_g1_refine()->yellow_zone(), |
1618 concurrent_g1_refine()->red_zone(), | |
794 | 1619 Shared_DirtyCardQ_lock); |
1620 | |
616
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1621 if (G1DeferredRSUpdate) { |
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1622 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
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1623 DirtyCardQ_FL_lock, |
1111 | 1624 -1, // never trigger processing |
1625 -1, // no limit on length | |
616
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1626 Shared_DirtyCardQ_lock, |
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1627 &JavaThread::dirty_card_queue_set()); |
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1628 } |
1705 | 1629 |
1630 // Initialize the card queue set used to hold cards containing | |
1631 // references into the collection set. | |
1632 _into_cset_dirty_card_queue_set.initialize(DirtyCardQ_CBL_mon, | |
1633 DirtyCardQ_FL_lock, | |
1634 -1, // never trigger processing | |
1635 -1, // no limit on length | |
1636 Shared_DirtyCardQ_lock, | |
1637 &JavaThread::dirty_card_queue_set()); | |
1638 | |
342 | 1639 // In case we're keeping closure specialization stats, initialize those |
1640 // counts and that mechanism. | |
1641 SpecializationStats::clear(); | |
1642 | |
1643 _gc_alloc_region_list = NULL; | |
1644 | |
1645 // Do later initialization work for concurrent refinement. | |
1646 _cg1r->init(); | |
1647 | |
1648 return JNI_OK; | |
1649 } | |
1650 | |
1651 void G1CollectedHeap::ref_processing_init() { | |
1652 SharedHeap::ref_processing_init(); | |
1653 MemRegion mr = reserved_region(); | |
1654 _ref_processor = ReferenceProcessor::create_ref_processor( | |
1655 mr, // span | |
1656 false, // Reference discovery is not atomic | |
1657 // (though it shouldn't matter here.) | |
1658 true, // mt_discovery | |
1659 NULL, // is alive closure: need to fill this in for efficiency | |
1660 ParallelGCThreads, | |
1661 ParallelRefProcEnabled, | |
1662 true); // Setting next fields of discovered | |
1663 // lists requires a barrier. | |
1664 } | |
1665 | |
1666 size_t G1CollectedHeap::capacity() const { | |
1667 return _g1_committed.byte_size(); | |
1668 } | |
1669 | |
1705 | 1670 void G1CollectedHeap::iterate_dirty_card_closure(CardTableEntryClosure* cl, |
1671 DirtyCardQueue* into_cset_dcq, | |
1672 bool concurrent, | |
342 | 1673 int worker_i) { |
889 | 1674 // Clean cards in the hot card cache |
1705 | 1675 concurrent_g1_refine()->clean_up_cache(worker_i, g1_rem_set(), into_cset_dcq); |
889 | 1676 |
342 | 1677 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
1678 int n_completed_buffers = 0; | |
1705 | 1679 while (dcqs.apply_closure_to_completed_buffer(cl, worker_i, 0, true)) { |
342 | 1680 n_completed_buffers++; |
1681 } | |
1682 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
1683 (double) n_completed_buffers); | |
1684 dcqs.clear_n_completed_buffers(); | |
1685 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
1686 } | |
1687 | |
1688 | |
1689 // Computes the sum of the storage used by the various regions. | |
1690 | |
1691 size_t G1CollectedHeap::used() const { | |
862
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1692 assert(Heap_lock->owner() != NULL, |
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1693 "Should be owned on this thread's behalf."); |
342 | 1694 size_t result = _summary_bytes_used; |
845
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1695 // Read only once in case it is set to NULL concurrently |
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1696 HeapRegion* hr = _cur_alloc_region; |
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1697 if (hr != NULL) |
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1698 result += hr->used(); |
342 | 1699 return result; |
1700 } | |
1701 | |
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1702 size_t G1CollectedHeap::used_unlocked() const { |
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1703 size_t result = _summary_bytes_used; |
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1704 return result; |
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1705 } |
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1706 |
342 | 1707 class SumUsedClosure: public HeapRegionClosure { |
1708 size_t _used; | |
1709 public: | |
1710 SumUsedClosure() : _used(0) {} | |
1711 bool doHeapRegion(HeapRegion* r) { | |
1712 if (!r->continuesHumongous()) { | |
1713 _used += r->used(); | |
1714 } | |
1715 return false; | |
1716 } | |
1717 size_t result() { return _used; } | |
1718 }; | |
1719 | |
1720 size_t G1CollectedHeap::recalculate_used() const { | |
1721 SumUsedClosure blk; | |
1722 _hrs->iterate(&blk); | |
1723 return blk.result(); | |
1724 } | |
1725 | |
1726 #ifndef PRODUCT | |
1727 class SumUsedRegionsClosure: public HeapRegionClosure { | |
1728 size_t _num; | |
1729 public: | |
677 | 1730 SumUsedRegionsClosure() : _num(0) {} |
342 | 1731 bool doHeapRegion(HeapRegion* r) { |
1732 if (r->continuesHumongous() || r->used() > 0 || r->is_gc_alloc_region()) { | |
1733 _num += 1; | |
1734 } | |
1735 return false; | |
1736 } | |
1737 size_t result() { return _num; } | |
1738 }; | |
1739 | |
1740 size_t G1CollectedHeap::recalculate_used_regions() const { | |
1741 SumUsedRegionsClosure blk; | |
1742 _hrs->iterate(&blk); | |
1743 return blk.result(); | |
1744 } | |
1745 #endif // PRODUCT | |
1746 | |
1747 size_t G1CollectedHeap::unsafe_max_alloc() { | |
1748 if (_free_regions > 0) return HeapRegion::GrainBytes; | |
1749 // otherwise, is there space in the current allocation region? | |
1750 | |
1751 // We need to store the current allocation region in a local variable | |
1752 // here. The problem is that this method doesn't take any locks and | |
1753 // there may be other threads which overwrite the current allocation | |
1754 // region field. attempt_allocation(), for example, sets it to NULL | |
1755 // and this can happen *after* the NULL check here but before the call | |
1756 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
1757 // to be a problem in the optimized build, since the two loads of the | |
1758 // current allocation region field are optimized away. | |
1759 HeapRegion* car = _cur_alloc_region; | |
1760 | |
1761 // FIXME: should iterate over all regions? | |
1762 if (car == NULL) { | |
1763 return 0; | |
1764 } | |
1765 return car->free(); | |
1766 } | |
1767 | |
1656
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1768 bool G1CollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { |
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1769 return |
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1770 ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
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1771 (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)); |
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1772 } |
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1773 |
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1774 void G1CollectedHeap::increment_full_collections_completed(bool outer) { |
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1775 MonitorLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
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1776 |
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1777 // We have already incremented _total_full_collections at the start |
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1778 // of the GC, so total_full_collections() represents how many full |
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1779 // collections have been started. |
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1780 unsigned int full_collections_started = total_full_collections(); |
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1781 |
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1782 // Given that this method is called at the end of a Full GC or of a |
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1783 // concurrent cycle, and those can be nested (i.e., a Full GC can |
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1784 // interrupt a concurrent cycle), the number of full collections |
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1785 // completed should be either one (in the case where there was no |
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1786 // nesting) or two (when a Full GC interrupted a concurrent cycle) |
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1787 // behind the number of full collections started. |
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1788 |
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1789 // This is the case for the inner caller, i.e. a Full GC. |
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1790 assert(outer || |
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1791 (full_collections_started == _full_collections_completed + 1) || |
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1792 (full_collections_started == _full_collections_completed + 2), |
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1793 err_msg("for inner caller: full_collections_started = %u " |
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1794 "is inconsistent with _full_collections_completed = %u", |
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1795 full_collections_started, _full_collections_completed)); |
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1796 |
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1797 // This is the case for the outer caller, i.e. the concurrent cycle. |
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1798 assert(!outer || |
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1799 (full_collections_started == _full_collections_completed + 1), |
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1800 err_msg("for outer caller: full_collections_started = %u " |
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1801 "is inconsistent with _full_collections_completed = %u", |
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1802 full_collections_started, _full_collections_completed)); |
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1803 |
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1804 _full_collections_completed += 1; |
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1805 |
1840
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1806 // We need to clear the "in_progress" flag in the CM thread before |
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1807 // we wake up any waiters (especially when ExplicitInvokesConcurrent |
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1808 // is set) so that if a waiter requests another System.gc() it doesn't |
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1809 // incorrectly see that a marking cyle is still in progress. |
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1810 if (outer) { |
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1811 _cmThread->clear_in_progress(); |
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1812 } |
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1813 |
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1814 // This notify_all() will ensure that a thread that called |
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1815 // System.gc() with (with ExplicitGCInvokesConcurrent set or not) |
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1816 // and it's waiting for a full GC to finish will be woken up. It is |
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1817 // waiting in VM_G1IncCollectionPause::doit_epilogue(). |
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1818 FullGCCount_lock->notify_all(); |
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1819 } |
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1820 |
342 | 1821 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { |
1822 assert(Thread::current()->is_VM_thread(), "Precondition#1"); | |
1823 assert(Heap_lock->is_locked(), "Precondition#2"); | |
1824 GCCauseSetter gcs(this, cause); | |
1825 switch (cause) { | |
1826 case GCCause::_heap_inspection: | |
1827 case GCCause::_heap_dump: { | |
1828 HandleMark hm; | |
1829 do_full_collection(false); // don't clear all soft refs | |
1830 break; | |
1831 } | |
1832 default: // XXX FIX ME | |
1833 ShouldNotReachHere(); // Unexpected use of this function | |
1834 } | |
1835 } | |
1836 | |
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1837 void G1CollectedHeap::collect(GCCause::Cause cause) { |
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1838 // The caller doesn't have the Heap_lock |
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1839 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); |
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1840 |
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1841 unsigned int gc_count_before; |
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1842 unsigned int full_gc_count_before; |
342 | 1843 { |
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1844 MutexLocker ml(Heap_lock); |
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1845 // Read the GC count while holding the Heap_lock |
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1846 gc_count_before = SharedHeap::heap()->total_collections(); |
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1847 full_gc_count_before = SharedHeap::heap()->total_full_collections(); |
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1848 |
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1849 // Don't want to do a GC until cleanup is completed. |
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1850 wait_for_cleanup_complete(); |
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1851 |
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1852 // We give up heap lock; VMThread::execute gets it back below |
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1853 } |
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1854 |
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1855 if (should_do_concurrent_full_gc(cause)) { |
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1856 // Schedule an initial-mark evacuation pause that will start a |
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1857 // concurrent cycle. |
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1858 VM_G1IncCollectionPause op(gc_count_before, |
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1859 true, /* should_initiate_conc_mark */ |
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1860 g1_policy()->max_pause_time_ms(), |
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1861 cause); |
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1862 VMThread::execute(&op); |
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1863 } else { |
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1864 if (cause == GCCause::_gc_locker |
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1865 DEBUG_ONLY(|| cause == GCCause::_scavenge_alot)) { |
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1866 |
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1867 // Schedule a standard evacuation pause. |
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1868 VM_G1IncCollectionPause op(gc_count_before, |
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1869 false, /* should_initiate_conc_mark */ |
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1870 g1_policy()->max_pause_time_ms(), |
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1871 cause); |
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1872 VMThread::execute(&op); |
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1873 } else { |
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1874 // Schedule a Full GC. |
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1875 VM_G1CollectFull op(gc_count_before, full_gc_count_before, cause); |
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1876 VMThread::execute(&op); |
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1877 } |
342 | 1878 } |
1879 } | |
1880 | |
1881 bool G1CollectedHeap::is_in(const void* p) const { | |
1882 if (_g1_committed.contains(p)) { | |
1883 HeapRegion* hr = _hrs->addr_to_region(p); | |
1884 return hr->is_in(p); | |
1885 } else { | |
1886 return _perm_gen->as_gen()->is_in(p); | |
1887 } | |
1888 } | |
1889 | |
1890 // Iteration functions. | |
1891 | |
1892 // Iterates an OopClosure over all ref-containing fields of objects | |
1893 // within a HeapRegion. | |
1894 | |
1895 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
1896 MemRegion _mr; | |
1897 OopClosure* _cl; | |
1898 public: | |
1899 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
1900 : _mr(mr), _cl(cl) {} | |
1901 bool doHeapRegion(HeapRegion* r) { | |
1902 if (! r->continuesHumongous()) { | |
1903 r->oop_iterate(_cl); | |
1904 } | |
1905 return false; | |
1906 } | |
1907 }; | |
1908 | |
678 | 1909 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
342 | 1910 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
1911 _hrs->iterate(&blk); | |
678 | 1912 if (do_perm) { |
1913 perm_gen()->oop_iterate(cl); | |
1914 } | |
342 | 1915 } |
1916 | |
678 | 1917 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
342 | 1918 IterateOopClosureRegionClosure blk(mr, cl); |
1919 _hrs->iterate(&blk); | |
678 | 1920 if (do_perm) { |
1921 perm_gen()->oop_iterate(cl); | |
1922 } | |
342 | 1923 } |
1924 | |
1925 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
1926 | |
1927 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
1928 ObjectClosure* _cl; | |
1929 public: | |
1930 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
1931 bool doHeapRegion(HeapRegion* r) { | |
1932 if (! r->continuesHumongous()) { | |
1933 r->object_iterate(_cl); | |
1934 } | |
1935 return false; | |
1936 } | |
1937 }; | |
1938 | |
678 | 1939 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
342 | 1940 IterateObjectClosureRegionClosure blk(cl); |
1941 _hrs->iterate(&blk); | |
678 | 1942 if (do_perm) { |
1943 perm_gen()->object_iterate(cl); | |
1944 } | |
342 | 1945 } |
1946 | |
1947 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
1948 // FIXME: is this right? | |
1949 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
1950 } | |
1951 | |
1952 // Calls a SpaceClosure on a HeapRegion. | |
1953 | |
1954 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
1955 SpaceClosure* _cl; | |
1956 public: | |
1957 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
1958 bool doHeapRegion(HeapRegion* r) { | |
1959 _cl->do_space(r); | |
1960 return false; | |
1961 } | |
1962 }; | |
1963 | |
1964 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
1965 SpaceClosureRegionClosure blk(cl); | |
1966 _hrs->iterate(&blk); | |
1967 } | |
1968 | |
1969 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) { | |
1970 _hrs->iterate(cl); | |
1971 } | |
1972 | |
1973 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
1974 HeapRegionClosure* cl) { | |
1975 _hrs->iterate_from(r, cl); | |
1976 } | |
1977 | |
1978 void | |
1979 G1CollectedHeap::heap_region_iterate_from(int idx, HeapRegionClosure* cl) { | |
1980 _hrs->iterate_from(idx, cl); | |
1981 } | |
1982 | |
1983 HeapRegion* G1CollectedHeap::region_at(size_t idx) { return _hrs->at(idx); } | |
1984 | |
1985 void | |
1986 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
1987 int worker, | |
1988 jint claim_value) { | |
355 | 1989 const size_t regions = n_regions(); |
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1990 const size_t worker_num = (G1CollectedHeap::use_parallel_gc_threads() ? ParallelGCThreads : 1); |
355 | 1991 // try to spread out the starting points of the workers |
1992 const size_t start_index = regions / worker_num * (size_t) worker; | |
1993 | |
1994 // each worker will actually look at all regions | |
1995 for (size_t count = 0; count < regions; ++count) { | |
1996 const size_t index = (start_index + count) % regions; | |
1997 assert(0 <= index && index < regions, "sanity"); | |
1998 HeapRegion* r = region_at(index); | |
1999 // we'll ignore "continues humongous" regions (we'll process them | |
2000 // when we come across their corresponding "start humongous" | |
2001 // region) and regions already claimed | |
2002 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
2003 continue; | |
2004 } | |
2005 // OK, try to claim it | |
342 | 2006 if (r->claimHeapRegion(claim_value)) { |
355 | 2007 // success! |
2008 assert(!r->continuesHumongous(), "sanity"); | |
2009 if (r->startsHumongous()) { | |
2010 // If the region is "starts humongous" we'll iterate over its | |
2011 // "continues humongous" first; in fact we'll do them | |
2012 // first. The order is important. In on case, calling the | |
2013 // closure on the "starts humongous" region might de-allocate | |
2014 // and clear all its "continues humongous" regions and, as a | |
2015 // result, we might end up processing them twice. So, we'll do | |
2016 // them first (notice: most closures will ignore them anyway) and | |
2017 // then we'll do the "starts humongous" region. | |
2018 for (size_t ch_index = index + 1; ch_index < regions; ++ch_index) { | |
2019 HeapRegion* chr = region_at(ch_index); | |
2020 | |
2021 // if the region has already been claimed or it's not | |
2022 // "continues humongous" we're done | |
2023 if (chr->claim_value() == claim_value || | |
2024 !chr->continuesHumongous()) { | |
2025 break; | |
2026 } | |
2027 | |
2028 // Noone should have claimed it directly. We can given | |
2029 // that we claimed its "starts humongous" region. | |
2030 assert(chr->claim_value() != claim_value, "sanity"); | |
2031 assert(chr->humongous_start_region() == r, "sanity"); | |
2032 | |
2033 if (chr->claimHeapRegion(claim_value)) { | |
2034 // we should always be able to claim it; noone else should | |
2035 // be trying to claim this region | |
2036 | |
2037 bool res2 = cl->doHeapRegion(chr); | |
2038 assert(!res2, "Should not abort"); | |
2039 | |
2040 // Right now, this holds (i.e., no closure that actually | |
2041 // does something with "continues humongous" regions | |
2042 // clears them). We might have to weaken it in the future, | |
2043 // but let's leave these two asserts here for extra safety. | |
2044 assert(chr->continuesHumongous(), "should still be the case"); | |
2045 assert(chr->humongous_start_region() == r, "sanity"); | |
2046 } else { | |
2047 guarantee(false, "we should not reach here"); | |
2048 } | |
2049 } | |
2050 } | |
2051 | |
2052 assert(!r->continuesHumongous(), "sanity"); | |
2053 bool res = cl->doHeapRegion(r); | |
2054 assert(!res, "Should not abort"); | |
2055 } | |
2056 } | |
2057 } | |
2058 | |
390 | 2059 class ResetClaimValuesClosure: public HeapRegionClosure { |
2060 public: | |
2061 bool doHeapRegion(HeapRegion* r) { | |
2062 r->set_claim_value(HeapRegion::InitialClaimValue); | |
2063 return false; | |
2064 } | |
2065 }; | |
2066 | |
2067 void | |
2068 G1CollectedHeap::reset_heap_region_claim_values() { | |
2069 ResetClaimValuesClosure blk; | |
2070 heap_region_iterate(&blk); | |
2071 } | |
2072 | |
355 | 2073 #ifdef ASSERT |
2074 // This checks whether all regions in the heap have the correct claim | |
2075 // value. I also piggy-backed on this a check to ensure that the | |
2076 // humongous_start_region() information on "continues humongous" | |
2077 // regions is correct. | |
2078 | |
2079 class CheckClaimValuesClosure : public HeapRegionClosure { | |
2080 private: | |
2081 jint _claim_value; | |
2082 size_t _failures; | |
2083 HeapRegion* _sh_region; | |
2084 public: | |
2085 CheckClaimValuesClosure(jint claim_value) : | |
2086 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
2087 bool doHeapRegion(HeapRegion* r) { | |
2088 if (r->claim_value() != _claim_value) { | |
2089 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
2090 "claim value = %d, should be %d", | |
2091 r->bottom(), r->end(), r->claim_value(), | |
2092 _claim_value); | |
2093 ++_failures; | |
2094 } | |
2095 if (!r->isHumongous()) { | |
2096 _sh_region = NULL; | |
2097 } else if (r->startsHumongous()) { | |
2098 _sh_region = r; | |
2099 } else if (r->continuesHumongous()) { | |
2100 if (r->humongous_start_region() != _sh_region) { | |
2101 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
2102 "HS = "PTR_FORMAT", should be "PTR_FORMAT, | |
2103 r->bottom(), r->end(), | |
2104 r->humongous_start_region(), | |
2105 _sh_region); | |
2106 ++_failures; | |
342 | 2107 } |
2108 } | |
355 | 2109 return false; |
2110 } | |
2111 size_t failures() { | |
2112 return _failures; | |
2113 } | |
2114 }; | |
2115 | |
2116 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
2117 CheckClaimValuesClosure cl(claim_value); | |
2118 heap_region_iterate(&cl); | |
2119 return cl.failures() == 0; | |
2120 } | |
2121 #endif // ASSERT | |
342 | 2122 |
2123 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { | |
2124 HeapRegion* r = g1_policy()->collection_set(); | |
2125 while (r != NULL) { | |
2126 HeapRegion* next = r->next_in_collection_set(); | |
2127 if (cl->doHeapRegion(r)) { | |
2128 cl->incomplete(); | |
2129 return; | |
2130 } | |
2131 r = next; | |
2132 } | |
2133 } | |
2134 | |
2135 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
2136 HeapRegionClosure *cl) { | |
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2137 if (r == NULL) { |
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2138 // The CSet is empty so there's nothing to do. |
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2139 return; |
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2140 } |
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2141 |
342 | 2142 assert(r->in_collection_set(), |
2143 "Start region must be a member of the collection set."); | |
2144 HeapRegion* cur = r; | |
2145 while (cur != NULL) { | |
2146 HeapRegion* next = cur->next_in_collection_set(); | |
2147 if (cl->doHeapRegion(cur) && false) { | |
2148 cl->incomplete(); | |
2149 return; | |
2150 } | |
2151 cur = next; | |
2152 } | |
2153 cur = g1_policy()->collection_set(); | |
2154 while (cur != r) { | |
2155 HeapRegion* next = cur->next_in_collection_set(); | |
2156 if (cl->doHeapRegion(cur) && false) { | |
2157 cl->incomplete(); | |
2158 return; | |
2159 } | |
2160 cur = next; | |
2161 } | |
2162 } | |
2163 | |
2164 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
2165 return _hrs->length() > 0 ? _hrs->at(0) : NULL; | |
2166 } | |
2167 | |
2168 | |
2169 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
2170 Space* res = heap_region_containing(addr); | |
2171 if (res == NULL) | |
2172 res = perm_gen()->space_containing(addr); | |
2173 return res; | |
2174 } | |
2175 | |
2176 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
2177 Space* sp = space_containing(addr); | |
2178 if (sp != NULL) { | |
2179 return sp->block_start(addr); | |
2180 } | |
2181 return NULL; | |
2182 } | |
2183 | |
2184 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
2185 Space* sp = space_containing(addr); | |
2186 assert(sp != NULL, "block_size of address outside of heap"); | |
2187 return sp->block_size(addr); | |
2188 } | |
2189 | |
2190 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
2191 Space* sp = space_containing(addr); | |
2192 return sp->block_is_obj(addr); | |
2193 } | |
2194 | |
2195 bool G1CollectedHeap::supports_tlab_allocation() const { | |
2196 return true; | |
2197 } | |
2198 | |
2199 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
2200 return HeapRegion::GrainBytes; | |
2201 } | |
2202 | |
2203 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
2204 // Return the remaining space in the cur alloc region, but not less than | |
2205 // the min TLAB size. | |
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2206 |
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2207 // Also, this value can be at most the humongous object threshold, |
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2208 // since we can't allow tlabs to grow big enough to accomodate |
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2209 // humongous objects. |
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2210 |
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2211 // We need to store the cur alloc region locally, since it might change |
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2212 // between when we test for NULL and when we use it later. |
342 | 2213 ContiguousSpace* cur_alloc_space = _cur_alloc_region; |
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2214 size_t max_tlab_size = _humongous_object_threshold_in_words * wordSize; |
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2215 |
342 | 2216 if (cur_alloc_space == NULL) { |
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2217 return max_tlab_size; |
342 | 2218 } else { |
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2219 return MIN2(MAX2(cur_alloc_space->free(), (size_t)MinTLABSize), |
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2220 max_tlab_size); |
342 | 2221 } |
2222 } | |
2223 | |
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2224 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t word_size) { |
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2225 assert(!isHumongous(word_size), |
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2226 err_msg("a TLAB should not be of humongous size, " |
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2227 "word_size = "SIZE_FORMAT, word_size)); |
342 | 2228 bool dummy; |
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2229 return G1CollectedHeap::mem_allocate(word_size, false, true, &dummy); |
342 | 2230 } |
2231 | |
2232 bool G1CollectedHeap::allocs_are_zero_filled() { | |
2233 return false; | |
2234 } | |
2235 | |
2236 size_t G1CollectedHeap::large_typearray_limit() { | |
2237 // FIXME | |
2238 return HeapRegion::GrainBytes/HeapWordSize; | |
2239 } | |
2240 | |
2241 size_t G1CollectedHeap::max_capacity() const { | |
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2242 return g1_reserved_obj_bytes(); |
342 | 2243 } |
2244 | |
2245 jlong G1CollectedHeap::millis_since_last_gc() { | |
2246 // assert(false, "NYI"); | |
2247 return 0; | |
2248 } | |
2249 | |
2250 | |
2251 void G1CollectedHeap::prepare_for_verify() { | |
2252 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
2253 ensure_parsability(false); | |
2254 } | |
2255 g1_rem_set()->prepare_for_verify(); | |
2256 } | |
2257 | |
2258 class VerifyLivenessOopClosure: public OopClosure { | |
2259 G1CollectedHeap* g1h; | |
2260 public: | |
2261 VerifyLivenessOopClosure(G1CollectedHeap* _g1h) { | |
2262 g1h = _g1h; | |
2263 } | |
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2264 void do_oop(narrowOop *p) { do_oop_work(p); } |
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2265 void do_oop( oop *p) { do_oop_work(p); } |
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2266 |
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2267 template <class T> void do_oop_work(T *p) { |
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2268 oop obj = oopDesc::load_decode_heap_oop(p); |
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2269 guarantee(obj == NULL || !g1h->is_obj_dead(obj), |
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2270 "Dead object referenced by a not dead object"); |
342 | 2271 } |
2272 }; | |
2273 | |
2274 class VerifyObjsInRegionClosure: public ObjectClosure { | |
811 | 2275 private: |
342 | 2276 G1CollectedHeap* _g1h; |
2277 size_t _live_bytes; | |
2278 HeapRegion *_hr; | |
811 | 2279 bool _use_prev_marking; |
342 | 2280 public: |
811 | 2281 // use_prev_marking == true -> use "prev" marking information, |
2282 // use_prev_marking == false -> use "next" marking information | |
2283 VerifyObjsInRegionClosure(HeapRegion *hr, bool use_prev_marking) | |
2284 : _live_bytes(0), _hr(hr), _use_prev_marking(use_prev_marking) { | |
342 | 2285 _g1h = G1CollectedHeap::heap(); |
2286 } | |
2287 void do_object(oop o) { | |
2288 VerifyLivenessOopClosure isLive(_g1h); | |
2289 assert(o != NULL, "Huh?"); | |
811 | 2290 if (!_g1h->is_obj_dead_cond(o, _use_prev_marking)) { |
342 | 2291 o->oop_iterate(&isLive); |
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2292 if (!_hr->obj_allocated_since_prev_marking(o)) { |
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2293 size_t obj_size = o->size(); // Make sure we don't overflow |
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2294 _live_bytes += (obj_size * HeapWordSize); |
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2295 } |
342 | 2296 } |
2297 } | |
2298 size_t live_bytes() { return _live_bytes; } | |
2299 }; | |
2300 | |
2301 class PrintObjsInRegionClosure : public ObjectClosure { | |
2302 HeapRegion *_hr; | |
2303 G1CollectedHeap *_g1; | |
2304 public: | |
2305 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
2306 _g1 = G1CollectedHeap::heap(); | |
2307 }; | |
2308 | |
2309 void do_object(oop o) { | |
2310 if (o != NULL) { | |
2311 HeapWord *start = (HeapWord *) o; | |
2312 size_t word_sz = o->size(); | |
2313 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
2314 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
2315 (void*) o, word_sz, | |
2316 _g1->isMarkedPrev(o), | |
2317 _g1->isMarkedNext(o), | |
2318 _hr->obj_allocated_since_prev_marking(o)); | |
2319 HeapWord *end = start + word_sz; | |
2320 HeapWord *cur; | |
2321 int *val; | |
2322 for (cur = start; cur < end; cur++) { | |
2323 val = (int *) cur; | |
2324 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
2325 } | |
2326 } | |
2327 } | |
2328 }; | |
2329 | |
2330 class VerifyRegionClosure: public HeapRegionClosure { | |
811 | 2331 private: |
342 | 2332 bool _allow_dirty; |
390 | 2333 bool _par; |
811 | 2334 bool _use_prev_marking; |
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2335 bool _failures; |
811 | 2336 public: |
2337 // use_prev_marking == true -> use "prev" marking information, | |
2338 // use_prev_marking == false -> use "next" marking information | |
2339 VerifyRegionClosure(bool allow_dirty, bool par, bool use_prev_marking) | |
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2340 : _allow_dirty(allow_dirty), |
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2341 _par(par), |
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2342 _use_prev_marking(use_prev_marking), |
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2343 _failures(false) {} |
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2344 |
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2345 bool failures() { |
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2346 return _failures; |
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2347 } |
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2348 |
342 | 2349 bool doHeapRegion(HeapRegion* r) { |
390 | 2350 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
2351 "Should be unclaimed at verify points."); | |
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2352 if (!r->continuesHumongous()) { |
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2353 bool failures = false; |
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2354 r->verify(_allow_dirty, _use_prev_marking, &failures); |
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2355 if (failures) { |
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2356 _failures = true; |
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2357 } else { |
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2358 VerifyObjsInRegionClosure not_dead_yet_cl(r, _use_prev_marking); |
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2359 r->object_iterate(¬_dead_yet_cl); |
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2360 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) { |
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2361 gclog_or_tty->print_cr("["PTR_FORMAT","PTR_FORMAT"] " |
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2362 "max_live_bytes "SIZE_FORMAT" " |
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2363 "< calculated "SIZE_FORMAT, |
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2364 r->bottom(), r->end(), |
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2365 r->max_live_bytes(), |
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2366 not_dead_yet_cl.live_bytes()); |
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2367 _failures = true; |
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2368 } |
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2369 } |
342 | 2370 } |
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2371 return false; // stop the region iteration if we hit a failure |
342 | 2372 } |
2373 }; | |
2374 | |
2375 class VerifyRootsClosure: public OopsInGenClosure { | |
2376 private: | |
2377 G1CollectedHeap* _g1h; | |
1020
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2378 bool _use_prev_marking; |
342 | 2379 bool _failures; |
2380 public: | |
811 | 2381 // use_prev_marking == true -> use "prev" marking information, |
2382 // use_prev_marking == false -> use "next" marking information | |
2383 VerifyRootsClosure(bool use_prev_marking) : | |
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2384 _g1h(G1CollectedHeap::heap()), |
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2385 _use_prev_marking(use_prev_marking), |
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2386 _failures(false) { } |
342 | 2387 |
2388 bool failures() { return _failures; } | |
2389 | |
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2390 template <class T> void do_oop_nv(T* p) { |
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2391 T heap_oop = oopDesc::load_heap_oop(p); |
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2392 if (!oopDesc::is_null(heap_oop)) { |
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2393 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
811 | 2394 if (_g1h->is_obj_dead_cond(obj, _use_prev_marking)) { |
342 | 2395 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
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2396 "points to dead obj "PTR_FORMAT, p, (void*) obj); |
342 | 2397 obj->print_on(gclog_or_tty); |
2398 _failures = true; | |
2399 } | |
2400 } | |
2401 } | |
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2402 |
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2403 void do_oop(oop* p) { do_oop_nv(p); } |
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2404 void do_oop(narrowOop* p) { do_oop_nv(p); } |
342 | 2405 }; |
2406 | |
390 | 2407 // This is the task used for parallel heap verification. |
2408 | |
2409 class G1ParVerifyTask: public AbstractGangTask { | |
2410 private: | |
2411 G1CollectedHeap* _g1h; | |
2412 bool _allow_dirty; | |
811 | 2413 bool _use_prev_marking; |
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2414 bool _failures; |
390 | 2415 |
2416 public: | |
811 | 2417 // use_prev_marking == true -> use "prev" marking information, |
2418 // use_prev_marking == false -> use "next" marking information | |
2419 G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty, | |
2420 bool use_prev_marking) : | |
390 | 2421 AbstractGangTask("Parallel verify task"), |
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2422 _g1h(g1h), |
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2423 _allow_dirty(allow_dirty), |
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2424 _use_prev_marking(use_prev_marking), |
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2425 _failures(false) { } |
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2426 |
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2427 bool failures() { |
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2428 return _failures; |
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2429 } |
390 | 2430 |
2431 void work(int worker_i) { | |
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2432 HandleMark hm; |
811 | 2433 VerifyRegionClosure blk(_allow_dirty, true, _use_prev_marking); |
390 | 2434 _g1h->heap_region_par_iterate_chunked(&blk, worker_i, |
2435 HeapRegion::ParVerifyClaimValue); | |
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2436 if (blk.failures()) { |
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2437 _failures = true; |
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2438 } |
390 | 2439 } |
2440 }; | |
2441 | |
342 | 2442 void G1CollectedHeap::verify(bool allow_dirty, bool silent) { |
811 | 2443 verify(allow_dirty, silent, /* use_prev_marking */ true); |
2444 } | |
2445 | |
2446 void G1CollectedHeap::verify(bool allow_dirty, | |
2447 bool silent, | |
2448 bool use_prev_marking) { | |
342 | 2449 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
2450 if (!silent) { gclog_or_tty->print("roots "); } | |
811 | 2451 VerifyRootsClosure rootsCl(use_prev_marking); |
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2452 CodeBlobToOopClosure blobsCl(&rootsCl, /*do_marking=*/ false); |
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2453 process_strong_roots(true, // activate StrongRootsScope |
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2454 false, |
342 | 2455 SharedHeap::SO_AllClasses, |
2456 &rootsCl, | |
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2457 &blobsCl, |
342 | 2458 &rootsCl); |
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2459 bool failures = rootsCl.failures(); |
342 | 2460 rem_set()->invalidate(perm_gen()->used_region(), false); |
2461 if (!silent) { gclog_or_tty->print("heapRegions "); } | |
390 | 2462 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
2463 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2464 "sanity check"); | |
2465 | |
811 | 2466 G1ParVerifyTask task(this, allow_dirty, use_prev_marking); |
390 | 2467 int n_workers = workers()->total_workers(); |
2468 set_par_threads(n_workers); | |
2469 workers()->run_task(&task); | |
2470 set_par_threads(0); | |
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2471 if (task.failures()) { |
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2472 failures = true; |
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2473 } |
390 | 2474 |
2475 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), | |
2476 "sanity check"); | |
2477 | |
2478 reset_heap_region_claim_values(); | |
2479 | |
2480 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2481 "sanity check"); | |
2482 } else { | |
811 | 2483 VerifyRegionClosure blk(allow_dirty, false, use_prev_marking); |
390 | 2484 _hrs->iterate(&blk); |
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2485 if (blk.failures()) { |
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2486 failures = true; |
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2487 } |
390 | 2488 } |
342 | 2489 if (!silent) gclog_or_tty->print("remset "); |
2490 rem_set()->verify(); | |
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2491 |
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2492 if (failures) { |
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2493 gclog_or_tty->print_cr("Heap:"); |
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2494 print_on(gclog_or_tty, true /* extended */); |
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2495 gclog_or_tty->print_cr(""); |
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2496 #ifndef PRODUCT |
1044 | 2497 if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) { |
1388 | 2498 concurrent_mark()->print_reachable("at-verification-failure", |
2499 use_prev_marking, false /* all */); | |
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2500 } |
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2501 #endif |
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2502 gclog_or_tty->flush(); |
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2503 } |
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2504 guarantee(!failures, "there should not have been any failures"); |
342 | 2505 } else { |
2506 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
2507 } | |
2508 } | |
2509 | |
2510 class PrintRegionClosure: public HeapRegionClosure { | |
2511 outputStream* _st; | |
2512 public: | |
2513 PrintRegionClosure(outputStream* st) : _st(st) {} | |
2514 bool doHeapRegion(HeapRegion* r) { | |
2515 r->print_on(_st); | |
2516 return false; | |
2517 } | |
2518 }; | |
2519 | |
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2520 void G1CollectedHeap::print() const { print_on(tty); } |
342 | 2521 |
2522 void G1CollectedHeap::print_on(outputStream* st) const { | |
838
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2523 print_on(st, PrintHeapAtGCExtended); |
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2524 } |
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2525 |
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2526 void G1CollectedHeap::print_on(outputStream* st, bool extended) const { |
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2527 st->print(" %-20s", "garbage-first heap"); |
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2528 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
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2529 capacity()/K, used_unlocked()/K); |
838
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2530 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
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2531 _g1_storage.low_boundary(), |
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2532 _g1_storage.high(), |
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2533 _g1_storage.high_boundary()); |
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2534 st->cr(); |
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2535 st->print(" region size " SIZE_FORMAT "K, ", |
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2536 HeapRegion::GrainBytes/K); |
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2537 size_t young_regions = _young_list->length(); |
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2538 st->print(SIZE_FORMAT " young (" SIZE_FORMAT "K), ", |
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2539 young_regions, young_regions * HeapRegion::GrainBytes / K); |
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2540 size_t survivor_regions = g1_policy()->recorded_survivor_regions(); |
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2541 st->print(SIZE_FORMAT " survivors (" SIZE_FORMAT "K)", |
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2542 survivor_regions, survivor_regions * HeapRegion::GrainBytes / K); |
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2543 st->cr(); |
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2544 perm()->as_gen()->print_on(st); |
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2545 if (extended) { |
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2546 st->cr(); |
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2547 print_on_extended(st); |
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2548 } |
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2549 } |
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2550 |
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2551 void G1CollectedHeap::print_on_extended(outputStream* st) const { |
342 | 2552 PrintRegionClosure blk(st); |
2553 _hrs->iterate(&blk); | |
2554 } | |
2555 | |
2556 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { | |
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2557 if (G1CollectedHeap::use_parallel_gc_threads()) { |
1019 | 2558 workers()->print_worker_threads_on(st); |
2559 } | |
2560 | |
2561 _cmThread->print_on(st); | |
342 | 2562 st->cr(); |
1019 | 2563 |
2564 _cm->print_worker_threads_on(st); | |
2565 | |
2566 _cg1r->print_worker_threads_on(st); | |
2567 | |
342 | 2568 _czft->print_on(st); |
2569 st->cr(); | |
2570 } | |
2571 | |
2572 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
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2573 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 2574 workers()->threads_do(tc); |
2575 } | |
2576 tc->do_thread(_cmThread); | |
794 | 2577 _cg1r->threads_do(tc); |
342 | 2578 tc->do_thread(_czft); |
2579 } | |
2580 | |
2581 void G1CollectedHeap::print_tracing_info() const { | |
2582 // We'll overload this to mean "trace GC pause statistics." | |
2583 if (TraceGen0Time || TraceGen1Time) { | |
2584 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
2585 // to that. | |
2586 g1_policy()->print_tracing_info(); | |
2587 } | |
751 | 2588 if (G1SummarizeRSetStats) { |
342 | 2589 g1_rem_set()->print_summary_info(); |
2590 } | |
1282 | 2591 if (G1SummarizeConcMark) { |
342 | 2592 concurrent_mark()->print_summary_info(); |
2593 } | |
751 | 2594 if (G1SummarizeZFStats) { |
342 | 2595 ConcurrentZFThread::print_summary_info(); |
2596 } | |
2597 g1_policy()->print_yg_surv_rate_info(); | |
2598 | |
2599 SpecializationStats::print(); | |
2600 } | |
2601 | |
2602 | |
2603 int G1CollectedHeap::addr_to_arena_id(void* addr) const { | |
2604 HeapRegion* hr = heap_region_containing(addr); | |
2605 if (hr == NULL) { | |
2606 return 0; | |
2607 } else { | |
2608 return 1; | |
2609 } | |
2610 } | |
2611 | |
2612 G1CollectedHeap* G1CollectedHeap::heap() { | |
2613 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
2614 "not a garbage-first heap"); | |
2615 return _g1h; | |
2616 } | |
2617 | |
2618 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
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2619 // always_do_update_barrier = false; |
342 | 2620 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
2621 // Call allocation profiler | |
2622 AllocationProfiler::iterate_since_last_gc(); | |
2623 // Fill TLAB's and such | |
2624 ensure_parsability(true); | |
2625 } | |
2626 | |
2627 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
2628 // FIXME: what is this about? | |
2629 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
2630 // is set. | |
2631 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
2632 "derived pointer present")); | |
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2633 // always_do_update_barrier = true; |
342 | 2634 } |
2635 | |
2636 void G1CollectedHeap::do_collection_pause() { | |
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2637 assert(Heap_lock->owned_by_self(), "we assume we'reholding the Heap_lock"); |
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2638 |
342 | 2639 // Read the GC count while holding the Heap_lock |
2640 // we need to do this _before_ wait_for_cleanup_complete(), to | |
2641 // ensure that we do not give up the heap lock and potentially | |
2642 // pick up the wrong count | |
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2643 unsigned int gc_count_before = SharedHeap::heap()->total_collections(); |
342 | 2644 |
2645 // Don't want to do a GC pause while cleanup is being completed! | |
2646 wait_for_cleanup_complete(); | |
2647 | |
2648 g1_policy()->record_stop_world_start(); | |
2649 { | |
2650 MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back | |
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2651 VM_G1IncCollectionPause op(gc_count_before, |
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2652 false, /* should_initiate_conc_mark */ |
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2653 g1_policy()->max_pause_time_ms(), |
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2654 GCCause::_g1_inc_collection_pause); |
342 | 2655 VMThread::execute(&op); |
2656 } | |
2657 } | |
2658 | |
2659 void | |
2660 G1CollectedHeap::doConcurrentMark() { | |
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2661 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
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2662 if (!_cmThread->in_progress()) { |
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2663 _cmThread->set_started(); |
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2664 CGC_lock->notify(); |
342 | 2665 } |
2666 } | |
2667 | |
2668 class VerifyMarkedObjsClosure: public ObjectClosure { | |
2669 G1CollectedHeap* _g1h; | |
2670 public: | |
2671 VerifyMarkedObjsClosure(G1CollectedHeap* g1h) : _g1h(g1h) {} | |
2672 void do_object(oop obj) { | |
2673 assert(obj->mark()->is_marked() ? !_g1h->is_obj_dead(obj) : true, | |
2674 "markandsweep mark should agree with concurrent deadness"); | |
2675 } | |
2676 }; | |
2677 | |
2678 void | |
2679 G1CollectedHeap::checkConcurrentMark() { | |
2680 VerifyMarkedObjsClosure verifycl(this); | |
2681 // MutexLockerEx x(getMarkBitMapLock(), | |
2682 // Mutex::_no_safepoint_check_flag); | |
678 | 2683 object_iterate(&verifycl, false); |
342 | 2684 } |
2685 | |
2686 void G1CollectedHeap::do_sync_mark() { | |
2687 _cm->checkpointRootsInitial(); | |
2688 _cm->markFromRoots(); | |
2689 _cm->checkpointRootsFinal(false); | |
2690 } | |
2691 | |
2692 // <NEW PREDICTION> | |
2693 | |
2694 double G1CollectedHeap::predict_region_elapsed_time_ms(HeapRegion *hr, | |
2695 bool young) { | |
2696 return _g1_policy->predict_region_elapsed_time_ms(hr, young); | |
2697 } | |
2698 | |
2699 void G1CollectedHeap::check_if_region_is_too_expensive(double | |
2700 predicted_time_ms) { | |
2701 _g1_policy->check_if_region_is_too_expensive(predicted_time_ms); | |
2702 } | |
2703 | |
2704 size_t G1CollectedHeap::pending_card_num() { | |
2705 size_t extra_cards = 0; | |
2706 JavaThread *curr = Threads::first(); | |
2707 while (curr != NULL) { | |
2708 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
2709 extra_cards += dcq.size(); | |
2710 curr = curr->next(); | |
2711 } | |
2712 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
2713 size_t buffer_size = dcqs.buffer_size(); | |
2714 size_t buffer_num = dcqs.completed_buffers_num(); | |
2715 return buffer_size * buffer_num + extra_cards; | |
2716 } | |
2717 | |
2718 size_t G1CollectedHeap::max_pending_card_num() { | |
2719 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
2720 size_t buffer_size = dcqs.buffer_size(); | |
2721 size_t buffer_num = dcqs.completed_buffers_num(); | |
2722 int thread_num = Threads::number_of_threads(); | |
2723 return (buffer_num + thread_num) * buffer_size; | |
2724 } | |
2725 | |
2726 size_t G1CollectedHeap::cards_scanned() { | |
1861 | 2727 return g1_rem_set()->cardsScanned(); |
342 | 2728 } |
2729 | |
2730 void | |
2731 G1CollectedHeap::setup_surviving_young_words() { | |
2732 guarantee( _surviving_young_words == NULL, "pre-condition" ); | |
2733 size_t array_length = g1_policy()->young_cset_length(); | |
2734 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, array_length); | |
2735 if (_surviving_young_words == NULL) { | |
2736 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
2737 "Not enough space for young surv words summary."); | |
2738 } | |
2739 memset(_surviving_young_words, 0, array_length * sizeof(size_t)); | |
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2740 #ifdef ASSERT |
342 | 2741 for (size_t i = 0; i < array_length; ++i) { |
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2742 assert( _surviving_young_words[i] == 0, "memset above" ); |
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2743 } |
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2744 #endif // !ASSERT |
342 | 2745 } |
2746 | |
2747 void | |
2748 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
2749 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
2750 size_t array_length = g1_policy()->young_cset_length(); | |
2751 for (size_t i = 0; i < array_length; ++i) | |
2752 _surviving_young_words[i] += surv_young_words[i]; | |
2753 } | |
2754 | |
2755 void | |
2756 G1CollectedHeap::cleanup_surviving_young_words() { | |
2757 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
2758 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
2759 _surviving_young_words = NULL; | |
2760 } | |
2761 | |
2762 // </NEW PREDICTION> | |
2763 | |
1261
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2764 struct PrepareForRSScanningClosure : public HeapRegionClosure { |
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2765 bool doHeapRegion(HeapRegion *r) { |
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2766 r->rem_set()->set_iter_claimed(0); |
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2767 return false; |
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2768 } |
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2769 }; |
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2770 |
1709 | 2771 #if TASKQUEUE_STATS |
2772 void G1CollectedHeap::print_taskqueue_stats_hdr(outputStream* const st) { | |
2773 st->print_raw_cr("GC Task Stats"); | |
2774 st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); | |
2775 st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); | |
2776 } | |
2777 | |
2778 void G1CollectedHeap::print_taskqueue_stats(outputStream* const st) const { | |
2779 print_taskqueue_stats_hdr(st); | |
2780 | |
2781 TaskQueueStats totals; | |
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2782 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 2783 for (int i = 0; i < n; ++i) { |
2784 st->print("%3d ", i); task_queue(i)->stats.print(st); st->cr(); | |
2785 totals += task_queue(i)->stats; | |
2786 } | |
2787 st->print_raw("tot "); totals.print(st); st->cr(); | |
2788 | |
2789 DEBUG_ONLY(totals.verify()); | |
2790 } | |
2791 | |
2792 void G1CollectedHeap::reset_taskqueue_stats() { | |
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2793 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 2794 for (int i = 0; i < n; ++i) { |
2795 task_queue(i)->stats.reset(); | |
2796 } | |
2797 } | |
2798 #endif // TASKQUEUE_STATS | |
2799 | |
342 | 2800 void |
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2801 G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { |
1359
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2802 if (GC_locker::check_active_before_gc()) { |
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2803 return; // GC is disabled (e.g. JNI GetXXXCritical operation) |
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2804 } |
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2805 |
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2806 if (PrintHeapAtGC) { |
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2807 Universe::print_heap_before_gc(); |
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2808 } |
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2809 |
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2810 { |
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2811 ResourceMark rm; |
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2812 |
1359
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2813 // This call will decide whether this pause is an initial-mark |
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2814 // pause. If it is, during_initial_mark_pause() will return true |
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2815 // for the duration of this pause. |
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2816 g1_policy()->decide_on_conc_mark_initiation(); |
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2817 |
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2818 char verbose_str[128]; |
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2819 sprintf(verbose_str, "GC pause "); |
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2820 if (g1_policy()->in_young_gc_mode()) { |
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2821 if (g1_policy()->full_young_gcs()) |
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2822 strcat(verbose_str, "(young)"); |
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2823 else |
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2824 strcat(verbose_str, "(partial)"); |
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2825 } |
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2826 if (g1_policy()->during_initial_mark_pause()) { |
838
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2827 strcat(verbose_str, " (initial-mark)"); |
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2828 // We are about to start a marking cycle, so we increment the |
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2829 // full collection counter. |
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|
2830 increment_total_full_collections(); |
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2831 } |
838
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2832 |
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2833 // if PrintGCDetails is on, we'll print long statistics information |
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2834 // in the collector policy code, so let's not print this as the output |
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2835 // is messy if we do. |
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|
2836 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
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2837 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); |
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2838 TraceTime t(verbose_str, PrintGC && !PrintGCDetails, true, gclog_or_tty); |
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2839 |
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2840 TraceMemoryManagerStats tms(false /* fullGC */); |
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2841 |
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2842 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); |
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2843 assert(Thread::current() == VMThread::vm_thread(), "should be in vm thread"); |
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|
2844 guarantee(!is_gc_active(), "collection is not reentrant"); |
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|
2845 assert(regions_accounted_for(), "Region leakage!"); |
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2846 |
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|
2847 increment_gc_time_stamp(); |
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2848 |
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2849 if (g1_policy()->in_young_gc_mode()) { |
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|
2850 assert(check_young_list_well_formed(), |
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|
2851 "young list should be well formed"); |
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|
2852 } |
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|
2853 |
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2854 { // Call to jvmpi::post_class_unload_events must occur outside of active GC |
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2855 IsGCActiveMark x; |
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|
2856 |
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|
2857 gc_prologue(false); |
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2858 increment_total_collections(false /* full gc */); |
342 | 2859 |
2860 #if G1_REM_SET_LOGGING | |
838
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2861 gclog_or_tty->print_cr("\nJust chose CS, heap:"); |
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|
2862 print(); |
342 | 2863 #endif |
2864 | |
838
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2865 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
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2866 HandleMark hm; // Discard invalid handles created during verification |
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|
2867 prepare_for_verify(); |
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2868 gclog_or_tty->print(" VerifyBeforeGC:"); |
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2869 Universe::verify(false); |
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|
2870 } |
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|
2871 |
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|
2872 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
0316eac49d5a
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2873 |
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|
2874 // We want to turn off ref discovery, if necessary, and turn it back on |
845
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2875 // on again later if we do. XXX Dubious: why is discovery disabled? |
838
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2876 bool was_enabled = ref_processor()->discovery_enabled(); |
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2877 if (was_enabled) ref_processor()->disable_discovery(); |
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|
2878 |
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|
2879 // Forget the current alloc region (we might even choose it to be part |
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2880 // of the collection set!). |
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|
2881 abandon_cur_alloc_region(); |
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|
2882 |
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|
2883 // The elapsed time induced by the start time below deliberately elides |
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2884 // the possible verification above. |
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|
2885 double start_time_sec = os::elapsedTime(); |
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2886 size_t start_used_bytes = used(); |
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|
2887 |
1394
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2888 #if YOUNG_LIST_VERBOSE |
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|
2889 gclog_or_tty->print_cr("\nBefore recording pause start.\nYoung_list:"); |
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|
2890 _young_list->print(); |
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2891 g1_policy()->print_collection_set(g1_policy()->inc_cset_head(), gclog_or_tty); |
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2892 #endif // YOUNG_LIST_VERBOSE |
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2893 |
838
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|
2894 g1_policy()->record_collection_pause_start(start_time_sec, |
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|
2895 start_used_bytes); |
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|
2896 |
1394
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|
2897 #if YOUNG_LIST_VERBOSE |
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|
2898 gclog_or_tty->print_cr("\nAfter recording pause start.\nYoung_list:"); |
838
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|
2899 _young_list->print(); |
1394
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2900 #endif // YOUNG_LIST_VERBOSE |
342 | 2901 |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2902 if (g1_policy()->during_initial_mark_pause()) { |
838
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|
2903 concurrent_mark()->checkpointRootsInitialPre(); |
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|
2904 } |
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|
2905 save_marks(); |
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|
2906 |
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|
2907 // We must do this before any possible evacuation that should propagate |
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|
2908 // marks. |
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|
2909 if (mark_in_progress()) { |
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|
2910 double start_time_sec = os::elapsedTime(); |
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|
2911 |
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|
2912 _cm->drainAllSATBBuffers(); |
0316eac49d5a
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|
2913 double finish_mark_ms = (os::elapsedTime() - start_time_sec) * 1000.0; |
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|
2914 g1_policy()->record_satb_drain_time(finish_mark_ms); |
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|
2915 } |
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|
2916 // Record the number of elements currently on the mark stack, so we |
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|
2917 // only iterate over these. (Since evacuation may add to the mark |
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|
2918 // stack, doing more exposes race conditions.) If no mark is in |
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|
2919 // progress, this will be zero. |
0316eac49d5a
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|
2920 _cm->set_oops_do_bound(); |
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|
2921 |
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|
2922 assert(regions_accounted_for(), "Region leakage."); |
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|
2923 |
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|
2924 if (mark_in_progress()) |
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|
2925 concurrent_mark()->newCSet(); |
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|
2926 |
1394
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|
2927 #if YOUNG_LIST_VERBOSE |
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|
2928 gclog_or_tty->print_cr("\nBefore choosing collection set.\nYoung_list:"); |
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|
2929 _young_list->print(); |
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|
2930 g1_policy()->print_collection_set(g1_policy()->inc_cset_head(), gclog_or_tty); |
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2931 #endif // YOUNG_LIST_VERBOSE |
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|
2932 |
1707 | 2933 g1_policy()->choose_collection_set(target_pause_time_ms); |
838
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|
2934 |
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|
2935 // Nothing to do if we were unable to choose a collection set. |
342 | 2936 #if G1_REM_SET_LOGGING |
1707 | 2937 gclog_or_tty->print_cr("\nAfter pause, heap:"); |
2938 print(); | |
342 | 2939 #endif |
1707 | 2940 PrepareForRSScanningClosure prepare_for_rs_scan; |
2941 collection_set_iterate(&prepare_for_rs_scan); | |
2942 | |
2943 setup_surviving_young_words(); | |
2944 | |
2945 // Set up the gc allocation regions. | |
2946 get_gc_alloc_regions(); | |
2947 | |
2948 // Actually do the work... | |
2949 evacuate_collection_set(); | |
2950 | |
2951 free_collection_set(g1_policy()->collection_set()); | |
2952 g1_policy()->clear_collection_set(); | |
2953 | |
2954 cleanup_surviving_young_words(); | |
2955 | |
2956 // Start a new incremental collection set for the next pause. | |
2957 g1_policy()->start_incremental_cset_building(); | |
2958 | |
2959 // Clear the _cset_fast_test bitmap in anticipation of adding | |
2960 // regions to the incremental collection set for the next | |
2961 // evacuation pause. | |
2962 clear_cset_fast_test(); | |
2963 | |
2964 if (g1_policy()->in_young_gc_mode()) { | |
2965 _young_list->reset_sampled_info(); | |
2966 | |
2967 // Don't check the whole heap at this point as the | |
2968 // GC alloc regions from this pause have been tagged | |
2969 // as survivors and moved on to the survivor list. | |
2970 // Survivor regions will fail the !is_young() check. | |
2971 assert(check_young_list_empty(false /* check_heap */), | |
2972 "young list should be empty"); | |
1394
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|
2973 |
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|
2974 #if YOUNG_LIST_VERBOSE |
1707 | 2975 gclog_or_tty->print_cr("Before recording survivors.\nYoung List:"); |
2976 _young_list->print(); | |
1394
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|
2977 #endif // YOUNG_LIST_VERBOSE |
342 | 2978 |
1707 | 2979 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
838
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|
2980 _young_list->first_survivor_region(), |
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|
2981 _young_list->last_survivor_region()); |
1394
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|
2982 |
1707 | 2983 _young_list->reset_auxilary_lists(); |
342 | 2984 } |
838
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|
2985 |
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|
2986 if (evacuation_failed()) { |
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|
2987 _summary_bytes_used = recalculate_used(); |
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|
2988 } else { |
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|
2989 // The "used" of the the collection set have already been subtracted |
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|
2990 // when they were freed. Add in the bytes evacuated. |
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|
2991 _summary_bytes_used += g1_policy()->bytes_in_to_space(); |
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|
2992 } |
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|
2993 |
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|
2994 if (g1_policy()->in_young_gc_mode() && |
1359
23b1b27ac76c
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|
2995 g1_policy()->during_initial_mark_pause()) { |
838
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|
2996 concurrent_mark()->checkpointRootsInitialPost(); |
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|
2997 set_marking_started(); |
845
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|
2998 // CAUTION: after the doConcurrentMark() call below, |
df6caf649ff7
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|
2999 // the concurrent marking thread(s) could be running |
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|
3000 // concurrently with us. Make sure that anything after |
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|
3001 // this point does not assume that we are the only GC thread |
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|
3002 // running. Note: of course, the actual marking work will |
df6caf649ff7
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|
3003 // not start until the safepoint itself is released in |
df6caf649ff7
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|
3004 // ConcurrentGCThread::safepoint_desynchronize(). |
838
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|
3005 doConcurrentMark(); |
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|
3006 } |
342 | 3007 |
1394
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|
3008 #if YOUNG_LIST_VERBOSE |
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1391
diff
changeset
|
3009 gclog_or_tty->print_cr("\nEnd of the pause.\nYoung_list:"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3010 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3011 g1_policy()->print_collection_set(g1_policy()->inc_cset_head(), gclog_or_tty); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3012 #endif // YOUNG_LIST_VERBOSE |
342 | 3013 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3014 double end_time_sec = os::elapsedTime(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3015 double pause_time_ms = (end_time_sec - start_time_sec) * MILLIUNITS; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3016 g1_policy()->record_pause_time_ms(pause_time_ms); |
1707 | 3017 g1_policy()->record_collection_pause_end(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3018 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3019 assert(regions_accounted_for(), "Region leakage."); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3020 |
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3021 MemoryService::track_memory_usage(); |
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3022 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3023 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3024 HandleMark hm; // Discard invalid handles created during verification |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3025 gclog_or_tty->print(" VerifyAfterGC:"); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3026 prepare_for_verify(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3027 Universe::verify(false); |
342 | 3028 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3029 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3030 if (was_enabled) ref_processor()->enable_discovery(); |
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 size_t expand_bytes = g1_policy()->expansion_amount(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3034 if (expand_bytes > 0) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3035 size_t bytes_before = capacity(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3036 expand(expand_bytes); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3037 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3038 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3039 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3040 if (mark_in_progress()) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3041 concurrent_mark()->update_g1_committed(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3042 } |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3043 |
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3044 #ifdef TRACESPINNING |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3045 ParallelTaskTerminator::print_termination_counts(); |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3046 #endif |
342 | 3047 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3048 gc_epilogue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3049 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3050 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3051 assert(verify_region_lists(), "Bad region lists."); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3052 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3053 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3054 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
|
3055 print_tracing_info(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3056 vm_exit(-1); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3057 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3058 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3059 |
1709 | 3060 TASKQUEUE_STATS_ONLY(if (ParallelGCVerbose) print_taskqueue_stats()); |
3061 TASKQUEUE_STATS_ONLY(reset_taskqueue_stats()); | |
3062 | |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3063 if (PrintHeapAtGC) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3064 Universe::print_heap_after_gc(); |
342 | 3065 } |
884
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3066 if (G1SummarizeRSetStats && |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3067 (G1SummarizeRSetStatsPeriod > 0) && |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3068 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3069 g1_rem_set()->print_summary_info(); |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3070 } |
342 | 3071 } |
3072 | |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3073 size_t G1CollectedHeap::desired_plab_sz(GCAllocPurpose purpose) |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3074 { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3075 size_t gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3076 switch (purpose) { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3077 case GCAllocForSurvived: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3078 gclab_word_size = YoungPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3079 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3080 case GCAllocForTenured: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3081 gclab_word_size = OldPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3082 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3083 default: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3084 assert(false, "unknown GCAllocPurpose"); |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3085 gclab_word_size = OldPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3086 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3087 } |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3088 return gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3089 } |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3090 |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3091 |
342 | 3092 void G1CollectedHeap::set_gc_alloc_region(int purpose, HeapRegion* r) { |
3093 assert(purpose >= 0 && purpose < GCAllocPurposeCount, "invalid purpose"); | |
636 | 3094 // make sure we don't call set_gc_alloc_region() multiple times on |
3095 // the same region | |
3096 assert(r == NULL || !r->is_gc_alloc_region(), | |
3097 "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
|
3098 assert(r == NULL || !r->isHumongous(), |
bda703475ded
6940894: G1: assert(new_obj != 0 || ... "should be forwarded") for compaction tests
johnc
parents:
1359
diff
changeset
|
3099 "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
|
3100 |
342 | 3101 HeapWord* original_top = NULL; |
3102 if (r != NULL) | |
3103 original_top = r->top(); | |
3104 | |
3105 // We will want to record the used space in r as being there before gc. | |
3106 // One we install it as a GC alloc region it's eligible for allocation. | |
3107 // So record it now and use it later. | |
3108 size_t r_used = 0; | |
3109 if (r != NULL) { | |
3110 r_used = r->used(); | |
3111 | |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
3112 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3113 // need to take the lock to guard against two threads calling |
3114 // get_gc_alloc_region concurrently (very unlikely but...) | |
3115 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
3116 r->save_marks(); | |
3117 } | |
3118 } | |
3119 HeapRegion* old_alloc_region = _gc_alloc_regions[purpose]; | |
3120 _gc_alloc_regions[purpose] = r; | |
3121 if (old_alloc_region != NULL) { | |
3122 // Replace aliases too. | |
3123 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
3124 if (_gc_alloc_regions[ap] == old_alloc_region) { | |
3125 _gc_alloc_regions[ap] = r; | |
3126 } | |
3127 } | |
3128 } | |
3129 if (r != NULL) { | |
3130 push_gc_alloc_region(r); | |
3131 if (mark_in_progress() && original_top != r->next_top_at_mark_start()) { | |
3132 // We are using a region as a GC alloc region after it has been used | |
3133 // as a mutator allocation region during the current marking cycle. | |
3134 // The mutator-allocated objects are currently implicitly marked, but | |
3135 // when we move hr->next_top_at_mark_start() forward at the the end | |
3136 // of the GC pause, they won't be. We therefore mark all objects in | |
3137 // the "gap". We do this object-by-object, since marking densely | |
3138 // does not currently work right with marking bitmap iteration. This | |
3139 // means we rely on TLAB filling at the start of pauses, and no | |
3140 // "resuscitation" of filled TLAB's. If we want to do this, we need | |
3141 // to fix the marking bitmap iteration. | |
3142 HeapWord* curhw = r->next_top_at_mark_start(); | |
3143 HeapWord* t = original_top; | |
3144 | |
3145 while (curhw < t) { | |
3146 oop cur = (oop)curhw; | |
3147 // We'll assume parallel for generality. This is rare code. | |
3148 concurrent_mark()->markAndGrayObjectIfNecessary(cur); // can't we just mark them? | |
3149 curhw = curhw + cur->size(); | |
3150 } | |
3151 assert(curhw == t, "Should have parsed correctly."); | |
3152 } | |
3153 if (G1PolicyVerbose > 1) { | |
3154 gclog_or_tty->print("New alloc region ["PTR_FORMAT", "PTR_FORMAT", " PTR_FORMAT") " | |
3155 "for survivors:", r->bottom(), original_top, r->end()); | |
3156 r->print(); | |
3157 } | |
3158 g1_policy()->record_before_bytes(r_used); | |
3159 } | |
3160 } | |
3161 | |
3162 void G1CollectedHeap::push_gc_alloc_region(HeapRegion* hr) { | |
3163 assert(Thread::current()->is_VM_thread() || | |
3164 par_alloc_during_gc_lock()->owned_by_self(), "Precondition"); | |
3165 assert(!hr->is_gc_alloc_region() && !hr->in_collection_set(), | |
3166 "Precondition."); | |
3167 hr->set_is_gc_alloc_region(true); | |
3168 hr->set_next_gc_alloc_region(_gc_alloc_region_list); | |
3169 _gc_alloc_region_list = hr; | |
3170 } | |
3171 | |
3172 #ifdef G1_DEBUG | |
3173 class FindGCAllocRegion: public HeapRegionClosure { | |
3174 public: | |
3175 bool doHeapRegion(HeapRegion* r) { | |
3176 if (r->is_gc_alloc_region()) { | |
3177 gclog_or_tty->print_cr("Region %d ["PTR_FORMAT"...] is still a gc_alloc_region.", | |
3178 r->hrs_index(), r->bottom()); | |
3179 } | |
3180 return false; | |
3181 } | |
3182 }; | |
3183 #endif // G1_DEBUG | |
3184 | |
3185 void G1CollectedHeap::forget_alloc_region_list() { | |
3186 assert(Thread::current()->is_VM_thread(), "Precondition"); | |
3187 while (_gc_alloc_region_list != NULL) { | |
3188 HeapRegion* r = _gc_alloc_region_list; | |
3189 assert(r->is_gc_alloc_region(), "Invariant."); | |
637
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3190 // 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
|
3191 // 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
|
3192 // 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
|
3193 // G1HRRSFlushLogBuffersOnVerify). It's safe thing to do after the |
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3194 // collection. |
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
636
diff
changeset
|
3195 r->ContiguousSpace::set_saved_mark(); |
342 | 3196 _gc_alloc_region_list = r->next_gc_alloc_region(); |
3197 r->set_next_gc_alloc_region(NULL); | |
3198 r->set_is_gc_alloc_region(false); | |
545 | 3199 if (r->is_survivor()) { |
3200 if (r->is_empty()) { | |
3201 r->set_not_young(); | |
3202 } else { | |
3203 _young_list->add_survivor_region(r); | |
3204 } | |
3205 } | |
342 | 3206 if (r->is_empty()) { |
3207 ++_free_regions; | |
3208 } | |
3209 } | |
3210 #ifdef G1_DEBUG | |
3211 FindGCAllocRegion fa; | |
3212 heap_region_iterate(&fa); | |
3213 #endif // G1_DEBUG | |
3214 } | |
3215 | |
3216 | |
3217 bool G1CollectedHeap::check_gc_alloc_regions() { | |
3218 // TODO: allocation regions check | |
3219 return true; | |
3220 } | |
3221 | |
3222 void G1CollectedHeap::get_gc_alloc_regions() { | |
636 | 3223 // First, let's check that the GC alloc region list is empty (it should) |
3224 assert(_gc_alloc_region_list == NULL, "invariant"); | |
3225 | |
342 | 3226 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
636 | 3227 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
|
3228 assert(_gc_alloc_region_counts[ap] == 0, "invariant"); |
636 | 3229 |
342 | 3230 // Create new GC alloc regions. |
636 | 3231 HeapRegion* alloc_region = _retained_gc_alloc_regions[ap]; |
3232 _retained_gc_alloc_regions[ap] = NULL; | |
3233 | |
3234 if (alloc_region != NULL) { | |
3235 assert(_retain_gc_alloc_region[ap], "only way to retain a GC region"); | |
3236 | |
3237 // let's make sure that the GC alloc region is not tagged as such | |
3238 // outside a GC operation | |
3239 assert(!alloc_region->is_gc_alloc_region(), "sanity"); | |
3240 | |
3241 if (alloc_region->in_collection_set() || | |
3242 alloc_region->top() == alloc_region->end() || | |
1360
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3243 alloc_region->top() == alloc_region->bottom() || |
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3244 alloc_region->isHumongous()) { |
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3245 // we will discard the current GC alloc region if |
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3246 // * it's in the collection set (it can happen!), |
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3247 // * it's already full (no point in using it), |
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3248 // * it's empty (this means that it was emptied during |
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3249 // a cleanup and it should be on the free list now), or |
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3250 // * it's humongous (this means that it was emptied |
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3251 // during a cleanup and was added to the free list, but |
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3252 // has been subseqently used to allocate a humongous |
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3253 // object that may be less than the region size). |
636 | 3254 |
3255 alloc_region = NULL; | |
3256 } | |
3257 } | |
3258 | |
3259 if (alloc_region == NULL) { | |
3260 // we will get a new GC alloc region | |
342 | 3261 alloc_region = newAllocRegionWithExpansion(ap, 0); |
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3262 } else { |
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3263 // the region was retained from the last collection |
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3264 ++_gc_alloc_region_counts[ap]; |
1388 | 3265 if (G1PrintHeapRegions) { |
3266 gclog_or_tty->print_cr("new alloc region %d:["PTR_FORMAT", "PTR_FORMAT"], " | |
3267 "top "PTR_FORMAT, | |
3268 alloc_region->hrs_index(), alloc_region->bottom(), alloc_region->end(), alloc_region->top()); | |
3269 } | |
342 | 3270 } |
636 | 3271 |
342 | 3272 if (alloc_region != NULL) { |
636 | 3273 assert(_gc_alloc_regions[ap] == NULL, "pre-condition"); |
342 | 3274 set_gc_alloc_region(ap, alloc_region); |
3275 } | |
636 | 3276 |
3277 assert(_gc_alloc_regions[ap] == NULL || | |
3278 _gc_alloc_regions[ap]->is_gc_alloc_region(), | |
3279 "the GC alloc region should be tagged as such"); | |
3280 assert(_gc_alloc_regions[ap] == NULL || | |
3281 _gc_alloc_regions[ap] == _gc_alloc_region_list, | |
3282 "the GC alloc region should be the same as the GC alloc list head"); | |
342 | 3283 } |
3284 // Set alternative regions for allocation purposes that have reached | |
636 | 3285 // their limit. |
342 | 3286 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
3287 GCAllocPurpose alt_purpose = g1_policy()->alternative_purpose(ap); | |
3288 if (_gc_alloc_regions[ap] == NULL && alt_purpose != ap) { | |
3289 _gc_alloc_regions[ap] = _gc_alloc_regions[alt_purpose]; | |
3290 } | |
3291 } | |
3292 assert(check_gc_alloc_regions(), "alloc regions messed up"); | |
3293 } | |
3294 | |
636 | 3295 void G1CollectedHeap::release_gc_alloc_regions(bool totally) { |
342 | 3296 // We keep a separate list of all regions that have been alloc regions in |
636 | 3297 // the current collection pause. Forget that now. This method will |
3298 // untag the GC alloc regions and tear down the GC alloc region | |
3299 // list. It's desirable that no regions are tagged as GC alloc | |
3300 // outside GCs. | |
342 | 3301 forget_alloc_region_list(); |
3302 | |
3303 // The current alloc regions contain objs that have survived | |
3304 // collection. Make them no longer GC alloc regions. | |
3305 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
3306 HeapRegion* r = _gc_alloc_regions[ap]; | |
636 | 3307 _retained_gc_alloc_regions[ap] = NULL; |
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3308 _gc_alloc_region_counts[ap] = 0; |
636 | 3309 |
3310 if (r != NULL) { | |
3311 // we retain nothing on _gc_alloc_regions between GCs | |
3312 set_gc_alloc_region(ap, NULL); | |
3313 | |
3314 if (r->is_empty()) { | |
3315 // we didn't actually allocate anything in it; let's just put | |
3316 // it on the free list | |
342 | 3317 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); |
3318 r->set_zero_fill_complete(); | |
3319 put_free_region_on_list_locked(r); | |
636 | 3320 } else if (_retain_gc_alloc_region[ap] && !totally) { |
3321 // retain it so that we can use it at the beginning of the next GC | |
3322 _retained_gc_alloc_regions[ap] = r; | |
342 | 3323 } |
3324 } | |
636 | 3325 } |
3326 } | |
3327 | |
3328 #ifndef PRODUCT | |
3329 // Useful for debugging | |
3330 | |
3331 void G1CollectedHeap::print_gc_alloc_regions() { | |
3332 gclog_or_tty->print_cr("GC alloc regions"); | |
3333 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
3334 HeapRegion* r = _gc_alloc_regions[ap]; | |
3335 if (r == NULL) { | |
3336 gclog_or_tty->print_cr(" %2d : "PTR_FORMAT, ap, NULL); | |
3337 } else { | |
3338 gclog_or_tty->print_cr(" %2d : "PTR_FORMAT" "SIZE_FORMAT, | |
3339 ap, r->bottom(), r->used()); | |
3340 } | |
3341 } | |
3342 } | |
3343 #endif // PRODUCT | |
342 | 3344 |
3345 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
3346 _drain_in_progress = false; | |
3347 set_evac_failure_closure(cl); | |
3348 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
3349 } | |
3350 | |
3351 void G1CollectedHeap::finalize_for_evac_failure() { | |
3352 assert(_evac_failure_scan_stack != NULL && | |
3353 _evac_failure_scan_stack->length() == 0, | |
3354 "Postcondition"); | |
3355 assert(!_drain_in_progress, "Postcondition"); | |
1045 | 3356 delete _evac_failure_scan_stack; |
342 | 3357 _evac_failure_scan_stack = NULL; |
3358 } | |
3359 | |
3360 | |
3361 | |
3362 // *** Sequential G1 Evacuation | |
3363 | |
3364 HeapWord* G1CollectedHeap::allocate_during_gc(GCAllocPurpose purpose, size_t word_size) { | |
3365 HeapRegion* alloc_region = _gc_alloc_regions[purpose]; | |
3366 // let the caller handle alloc failure | |
3367 if (alloc_region == NULL) return NULL; | |
3368 assert(isHumongous(word_size) || !alloc_region->isHumongous(), | |
3369 "Either the object is humongous or the region isn't"); | |
3370 HeapWord* block = alloc_region->allocate(word_size); | |
3371 if (block == NULL) { | |
3372 block = allocate_during_gc_slow(purpose, alloc_region, false, word_size); | |
3373 } | |
3374 return block; | |
3375 } | |
3376 | |
3377 class G1IsAliveClosure: public BoolObjectClosure { | |
3378 G1CollectedHeap* _g1; | |
3379 public: | |
3380 G1IsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
3381 void do_object(oop p) { assert(false, "Do not call."); } | |
3382 bool do_object_b(oop p) { | |
3383 // It is reachable if it is outside the collection set, or is inside | |
3384 // and forwarded. | |
3385 | |
3386 #ifdef G1_DEBUG | |
3387 gclog_or_tty->print_cr("is alive "PTR_FORMAT" in CS %d forwarded %d overall %d", | |
3388 (void*) p, _g1->obj_in_cs(p), p->is_forwarded(), | |
3389 !_g1->obj_in_cs(p) || p->is_forwarded()); | |
3390 #endif // G1_DEBUG | |
3391 | |
3392 return !_g1->obj_in_cs(p) || p->is_forwarded(); | |
3393 } | |
3394 }; | |
3395 | |
3396 class G1KeepAliveClosure: public OopClosure { | |
3397 G1CollectedHeap* _g1; | |
3398 public: | |
3399 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
845
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3400 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
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3401 void do_oop( oop* p) { |
342 | 3402 oop obj = *p; |
3403 #ifdef G1_DEBUG | |
3404 if (PrintGC && Verbose) { | |
3405 gclog_or_tty->print_cr("keep alive *"PTR_FORMAT" = "PTR_FORMAT" "PTR_FORMAT, | |
3406 p, (void*) obj, (void*) *p); | |
3407 } | |
3408 #endif // G1_DEBUG | |
3409 | |
3410 if (_g1->obj_in_cs(obj)) { | |
3411 assert( obj->is_forwarded(), "invariant" ); | |
3412 *p = obj->forwardee(); | |
3413 #ifdef G1_DEBUG | |
3414 gclog_or_tty->print_cr(" in CSet: moved "PTR_FORMAT" -> "PTR_FORMAT, | |
3415 (void*) obj, (void*) *p); | |
3416 #endif // G1_DEBUG | |
3417 } | |
3418 } | |
3419 }; | |
3420 | |
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3421 class UpdateRSetDeferred : public OopsInHeapRegionClosure { |
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3422 private: |
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3423 G1CollectedHeap* _g1; |
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3424 DirtyCardQueue *_dcq; |
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3425 CardTableModRefBS* _ct_bs; |
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3426 |
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3427 public: |
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3428 UpdateRSetDeferred(G1CollectedHeap* g1, DirtyCardQueue* dcq) : |
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3429 _g1(g1), _ct_bs((CardTableModRefBS*)_g1->barrier_set()), _dcq(dcq) {} |
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3430 |
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3431 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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3432 virtual void do_oop( oop* p) { do_oop_work(p); } |
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3433 template <class T> void do_oop_work(T* p) { |
616
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3434 assert(_from->is_in_reserved(p), "paranoia"); |
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3435 if (!_from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && |
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3436 !_from->is_survivor()) { |
616
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3437 size_t card_index = _ct_bs->index_for(p); |
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3438 if (_ct_bs->mark_card_deferred(card_index)) { |
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3439 _dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index)); |
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3440 } |
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3441 } |
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3442 } |
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|
3443 }; |
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3444 |
342 | 3445 class RemoveSelfPointerClosure: public ObjectClosure { |
3446 private: | |
3447 G1CollectedHeap* _g1; | |
3448 ConcurrentMark* _cm; | |
3449 HeapRegion* _hr; | |
3450 size_t _prev_marked_bytes; | |
3451 size_t _next_marked_bytes; | |
616
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3452 OopsInHeapRegionClosure *_cl; |
342 | 3453 public: |
616
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3454 RemoveSelfPointerClosure(G1CollectedHeap* g1, OopsInHeapRegionClosure* cl) : |
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3455 _g1(g1), _cm(_g1->concurrent_mark()), _prev_marked_bytes(0), |
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3456 _next_marked_bytes(0), _cl(cl) {} |
342 | 3457 |
3458 size_t prev_marked_bytes() { return _prev_marked_bytes; } | |
3459 size_t next_marked_bytes() { return _next_marked_bytes; } | |
3460 | |
352
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3461 // The original idea here was to coalesce evacuated and dead objects. |
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3462 // However that caused complications with the block offset table (BOT). |
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3463 // In particular if there were two TLABs, one of them partially refined. |
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3464 // |----- TLAB_1--------|----TLAB_2-~~~(partially refined part)~~~| |
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3465 // The BOT entries of the unrefined part of TLAB_2 point to the start |
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3466 // of TLAB_2. If the last object of the TLAB_1 and the first object |
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3467 // of TLAB_2 are coalesced, then the cards of the unrefined part |
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3468 // would point into middle of the filler object. |
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3469 // |
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3470 // The current approach is to not coalesce and leave the BOT contents intact. |
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3471 void do_object(oop obj) { |
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3472 if (obj->is_forwarded() && obj->forwardee() == obj) { |
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3473 // The object failed to move. |
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3474 assert(!_g1->is_obj_dead(obj), "We should not be preserving dead objs."); |
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3475 _cm->markPrev(obj); |
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3476 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
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3477 _prev_marked_bytes += (obj->size() * HeapWordSize); |
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3478 if (_g1->mark_in_progress() && !_g1->is_obj_ill(obj)) { |
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3479 _cm->markAndGrayObjectIfNecessary(obj); |
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3480 } |
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3481 obj->set_mark(markOopDesc::prototype()); |
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3482 // While we were processing RSet buffers during the |
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3483 // collection, we actually didn't scan any cards on the |
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3484 // collection set, since we didn't want to update remebered |
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3485 // sets with entries that point into the collection set, given |
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3486 // that live objects fromthe collection set are about to move |
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3487 // and such entries will be stale very soon. This change also |
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3488 // dealt with a reliability issue which involved scanning a |
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3489 // card in the collection set and coming across an array that |
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3490 // was being chunked and looking malformed. The problem is |
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3491 // that, if evacuation fails, we might have remembered set |
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3492 // entries missing given that we skipped cards on the |
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3493 // collection set. So, we'll recreate such entries now. |
616
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3494 obj->oop_iterate(_cl); |
352
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3495 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
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3496 } else { |
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3497 // The object has been either evacuated or is dead. Fill it with a |
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3498 // dummy object. |
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3499 MemRegion mr((HeapWord*)obj, obj->size()); |
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3500 CollectedHeap::fill_with_object(mr); |
342 | 3501 _cm->clearRangeBothMaps(mr); |
3502 } | |
3503 } | |
3504 }; | |
3505 | |
3506 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
1705 | 3507 UpdateRSetImmediate immediate_update(_g1h->g1_rem_set()); |
616
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3508 DirtyCardQueue dcq(&_g1h->dirty_card_queue_set()); |
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3509 UpdateRSetDeferred deferred_update(_g1h, &dcq); |
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3510 OopsInHeapRegionClosure *cl; |
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3511 if (G1DeferredRSUpdate) { |
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3512 cl = &deferred_update; |
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3513 } else { |
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3514 cl = &immediate_update; |
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3515 } |
342 | 3516 HeapRegion* cur = g1_policy()->collection_set(); |
3517 while (cur != NULL) { | |
3518 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
3519 | |
616
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3520 RemoveSelfPointerClosure rspc(_g1h, cl); |
342 | 3521 if (cur->evacuation_failed()) { |
3522 assert(cur->in_collection_set(), "bad CS"); | |
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3523 cl->set_region(cur); |
342 | 3524 cur->object_iterate(&rspc); |
3525 | |
3526 // A number of manipulations to make the TAMS be the current top, | |
3527 // and the marked bytes be the ones observed in the iteration. | |
3528 if (_g1h->concurrent_mark()->at_least_one_mark_complete()) { | |
3529 // The comments below are the postconditions achieved by the | |
3530 // calls. Note especially the last such condition, which says that | |
3531 // the count of marked bytes has been properly restored. | |
3532 cur->note_start_of_marking(false); | |
3533 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
3534 cur->add_to_marked_bytes(rspc.prev_marked_bytes()); | |
3535 // _next_marked_bytes == prev_marked_bytes. | |
3536 cur->note_end_of_marking(); | |
3537 // _prev_top_at_mark_start == top(), | |
3538 // _prev_marked_bytes == prev_marked_bytes | |
3539 } | |
3540 // If there is no mark in progress, we modified the _next variables | |
3541 // above needlessly, but harmlessly. | |
3542 if (_g1h->mark_in_progress()) { | |
3543 cur->note_start_of_marking(false); | |
3544 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
3545 // _next_marked_bytes == next_marked_bytes. | |
3546 } | |
3547 | |
3548 // Now make sure the region has the right index in the sorted array. | |
3549 g1_policy()->note_change_in_marked_bytes(cur); | |
3550 } | |
3551 cur = cur->next_in_collection_set(); | |
3552 } | |
3553 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
3554 | |
3555 // Now restore saved marks, if any. | |
3556 if (_objs_with_preserved_marks != NULL) { | |
3557 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
3558 assert(_objs_with_preserved_marks->length() == | |
3559 _preserved_marks_of_objs->length(), "Both or none."); | |
3560 guarantee(_objs_with_preserved_marks->length() == | |
3561 _preserved_marks_of_objs->length(), "Both or none."); | |
3562 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
3563 oop obj = _objs_with_preserved_marks->at(i); | |
3564 markOop m = _preserved_marks_of_objs->at(i); | |
3565 obj->set_mark(m); | |
3566 } | |
3567 // Delete the preserved marks growable arrays (allocated on the C heap). | |
3568 delete _objs_with_preserved_marks; | |
3569 delete _preserved_marks_of_objs; | |
3570 _objs_with_preserved_marks = NULL; | |
3571 _preserved_marks_of_objs = NULL; | |
3572 } | |
3573 } | |
3574 | |
3575 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
3576 _evac_failure_scan_stack->push(obj); | |
3577 } | |
3578 | |
3579 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
3580 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
3581 | |
3582 while (_evac_failure_scan_stack->length() > 0) { | |
3583 oop obj = _evac_failure_scan_stack->pop(); | |
3584 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
3585 obj->oop_iterate_backwards(_evac_failure_closure); | |
3586 } | |
3587 } | |
3588 | |
3589 void G1CollectedHeap::handle_evacuation_failure(oop old) { | |
3590 markOop m = old->mark(); | |
3591 // forward to self | |
3592 assert(!old->is_forwarded(), "precondition"); | |
3593 | |
3594 old->forward_to(old); | |
3595 handle_evacuation_failure_common(old, m); | |
3596 } | |
3597 | |
3598 oop | |
3599 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
3600 oop old) { | |
3601 markOop m = old->mark(); | |
3602 oop forward_ptr = old->forward_to_atomic(old); | |
3603 if (forward_ptr == NULL) { | |
3604 // Forward-to-self succeeded. | |
3605 if (_evac_failure_closure != cl) { | |
3606 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
3607 assert(!_drain_in_progress, | |
3608 "Should only be true while someone holds the lock."); | |
3609 // Set the global evac-failure closure to the current thread's. | |
3610 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
3611 set_evac_failure_closure(cl); | |
3612 // Now do the common part. | |
3613 handle_evacuation_failure_common(old, m); | |
3614 // Reset to NULL. | |
3615 set_evac_failure_closure(NULL); | |
3616 } else { | |
3617 // The lock is already held, and this is recursive. | |
3618 assert(_drain_in_progress, "This should only be the recursive case."); | |
3619 handle_evacuation_failure_common(old, m); | |
3620 } | |
3621 return old; | |
3622 } else { | |
3623 // Someone else had a place to copy it. | |
3624 return forward_ptr; | |
3625 } | |
3626 } | |
3627 | |
3628 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
3629 set_evacuation_failed(true); | |
3630 | |
3631 preserve_mark_if_necessary(old, m); | |
3632 | |
3633 HeapRegion* r = heap_region_containing(old); | |
3634 if (!r->evacuation_failed()) { | |
3635 r->set_evacuation_failed(true); | |
1282 | 3636 if (G1PrintHeapRegions) { |
1719
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3637 gclog_or_tty->print("overflow in heap region "PTR_FORMAT" " |
342 | 3638 "["PTR_FORMAT","PTR_FORMAT")\n", |
3639 r, r->bottom(), r->end()); | |
3640 } | |
3641 } | |
3642 | |
3643 push_on_evac_failure_scan_stack(old); | |
3644 | |
3645 if (!_drain_in_progress) { | |
3646 // prevent recursion in copy_to_survivor_space() | |
3647 _drain_in_progress = true; | |
3648 drain_evac_failure_scan_stack(); | |
3649 _drain_in_progress = false; | |
3650 } | |
3651 } | |
3652 | |
3653 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
3654 if (m != markOopDesc::prototype()) { | |
3655 if (_objs_with_preserved_marks == NULL) { | |
3656 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
3657 _objs_with_preserved_marks = | |
3658 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
3659 _preserved_marks_of_objs = | |
3660 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
3661 } | |
3662 _objs_with_preserved_marks->push(obj); | |
3663 _preserved_marks_of_objs->push(m); | |
3664 } | |
3665 } | |
3666 | |
3667 // *** Parallel G1 Evacuation | |
3668 | |
3669 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
3670 size_t word_size) { | |
1718
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3671 assert(!isHumongous(word_size), |
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3672 err_msg("we should not be seeing humongous allocation requests " |
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3673 "during GC, word_size = "SIZE_FORMAT, word_size)); |
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3674 |
342 | 3675 HeapRegion* alloc_region = _gc_alloc_regions[purpose]; |
3676 // let the caller handle alloc failure | |
3677 if (alloc_region == NULL) return NULL; | |
3678 | |
3679 HeapWord* block = alloc_region->par_allocate(word_size); | |
3680 if (block == NULL) { | |
3681 MutexLockerEx x(par_alloc_during_gc_lock(), | |
3682 Mutex::_no_safepoint_check_flag); | |
3683 block = allocate_during_gc_slow(purpose, alloc_region, true, word_size); | |
3684 } | |
3685 return block; | |
3686 } | |
3687 | |
545 | 3688 void G1CollectedHeap::retire_alloc_region(HeapRegion* alloc_region, |
3689 bool par) { | |
3690 // Another thread might have obtained alloc_region for the given | |
3691 // purpose, and might be attempting to allocate in it, and might | |
3692 // succeed. Therefore, we can't do the "finalization" stuff on the | |
3693 // region below until we're sure the last allocation has happened. | |
3694 // We ensure this by allocating the remaining space with a garbage | |
3695 // object. | |
3696 if (par) par_allocate_remaining_space(alloc_region); | |
3697 // Now we can do the post-GC stuff on the region. | |
3698 alloc_region->note_end_of_copying(); | |
3699 g1_policy()->record_after_bytes(alloc_region->used()); | |
3700 } | |
3701 | |
342 | 3702 HeapWord* |
3703 G1CollectedHeap::allocate_during_gc_slow(GCAllocPurpose purpose, | |
3704 HeapRegion* alloc_region, | |
3705 bool par, | |
3706 size_t word_size) { | |
1718
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3707 assert(!isHumongous(word_size), |
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3708 err_msg("we should not be seeing humongous allocation requests " |
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3709 "during GC, word_size = "SIZE_FORMAT, word_size)); |
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3710 |
342 | 3711 HeapWord* block = NULL; |
3712 // In the parallel case, a previous thread to obtain the lock may have | |
3713 // already assigned a new gc_alloc_region. | |
3714 if (alloc_region != _gc_alloc_regions[purpose]) { | |
3715 assert(par, "But should only happen in parallel case."); | |
3716 alloc_region = _gc_alloc_regions[purpose]; | |
3717 if (alloc_region == NULL) return NULL; | |
3718 block = alloc_region->par_allocate(word_size); | |
3719 if (block != NULL) return block; | |
3720 // Otherwise, continue; this new region is empty, too. | |
3721 } | |
3722 assert(alloc_region != NULL, "We better have an allocation region"); | |
545 | 3723 retire_alloc_region(alloc_region, par); |
342 | 3724 |
3725 if (_gc_alloc_region_counts[purpose] >= g1_policy()->max_regions(purpose)) { | |
3726 // Cannot allocate more regions for the given purpose. | |
3727 GCAllocPurpose alt_purpose = g1_policy()->alternative_purpose(purpose); | |
3728 // Is there an alternative? | |
3729 if (purpose != alt_purpose) { | |
3730 HeapRegion* alt_region = _gc_alloc_regions[alt_purpose]; | |
3731 // Has not the alternative region been aliased? | |
545 | 3732 if (alloc_region != alt_region && alt_region != NULL) { |
342 | 3733 // Try to allocate in the alternative region. |
3734 if (par) { | |
3735 block = alt_region->par_allocate(word_size); | |
3736 } else { | |
3737 block = alt_region->allocate(word_size); | |
3738 } | |
3739 // Make an alias. | |
3740 _gc_alloc_regions[purpose] = _gc_alloc_regions[alt_purpose]; | |
545 | 3741 if (block != NULL) { |
3742 return block; | |
3743 } | |
3744 retire_alloc_region(alt_region, par); | |
342 | 3745 } |
3746 // Both the allocation region and the alternative one are full | |
3747 // and aliased, replace them with a new allocation region. | |
3748 purpose = alt_purpose; | |
3749 } else { | |
3750 set_gc_alloc_region(purpose, NULL); | |
3751 return NULL; | |
3752 } | |
3753 } | |
3754 | |
3755 // Now allocate a new region for allocation. | |
3756 alloc_region = newAllocRegionWithExpansion(purpose, word_size, false /*zero_filled*/); | |
3757 | |
3758 // let the caller handle alloc failure | |
3759 if (alloc_region != NULL) { | |
3760 | |
3761 assert(check_gc_alloc_regions(), "alloc regions messed up"); | |
3762 assert(alloc_region->saved_mark_at_top(), | |
3763 "Mark should have been saved already."); | |
3764 // We used to assert that the region was zero-filled here, but no | |
3765 // longer. | |
3766 | |
3767 // This must be done last: once it's installed, other regions may | |
3768 // allocate in it (without holding the lock.) | |
3769 set_gc_alloc_region(purpose, alloc_region); | |
3770 | |
3771 if (par) { | |
3772 block = alloc_region->par_allocate(word_size); | |
3773 } else { | |
3774 block = alloc_region->allocate(word_size); | |
3775 } | |
3776 // Caller handles alloc failure. | |
3777 } else { | |
3778 // This sets other apis using the same old alloc region to NULL, also. | |
3779 set_gc_alloc_region(purpose, NULL); | |
3780 } | |
3781 return block; // May be NULL. | |
3782 } | |
3783 | |
3784 void G1CollectedHeap::par_allocate_remaining_space(HeapRegion* r) { | |
3785 HeapWord* block = NULL; | |
3786 size_t free_words; | |
3787 do { | |
3788 free_words = r->free()/HeapWordSize; | |
3789 // If there's too little space, no one can allocate, so we're done. | |
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3790 if (free_words < CollectedHeap::min_fill_size()) return; |
342 | 3791 // Otherwise, try to claim it. |
3792 block = r->par_allocate(free_words); | |
3793 } while (block == NULL); | |
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3794 fill_with_object(block, free_words); |
342 | 3795 } |
3796 | |
3797 #ifndef PRODUCT | |
3798 bool GCLabBitMapClosure::do_bit(size_t offset) { | |
3799 HeapWord* addr = _bitmap->offsetToHeapWord(offset); | |
3800 guarantee(_cm->isMarked(oop(addr)), "it should be!"); | |
3801 return true; | |
3802 } | |
3803 #endif // PRODUCT | |
3804 | |
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3805 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num) |
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3806 : _g1h(g1h), |
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3807 _refs(g1h->task_queue(queue_num)), |
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3808 _dcq(&g1h->dirty_card_queue_set()), |
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3809 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
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3810 _g1_rem(g1h->g1_rem_set()), |
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3811 _hash_seed(17), _queue_num(queue_num), |
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3812 _term_attempts(0), |
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3813 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)), |
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3814 _tenured_alloc_buffer(g1h->desired_plab_sz(GCAllocForTenured)), |
845
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3815 _age_table(false), |
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3816 _strong_roots_time(0), _term_time(0), |
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3817 _alloc_buffer_waste(0), _undo_waste(0) |
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3818 { |
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3819 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
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3820 // we "sacrifice" entry 0 to keep track of surviving bytes for |
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3821 // non-young regions (where the age is -1) |
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3822 // We also add a few elements at the beginning and at the end in |
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3823 // an attempt to eliminate cache contention |
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3824 size_t real_length = 1 + _g1h->g1_policy()->young_cset_length(); |
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3825 size_t array_length = PADDING_ELEM_NUM + |
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3826 real_length + |
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3827 PADDING_ELEM_NUM; |
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3828 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length); |
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3829 if (_surviving_young_words_base == NULL) |
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3830 vm_exit_out_of_memory(array_length * sizeof(size_t), |
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3831 "Not enough space for young surv histo."); |
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3832 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; |
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3833 memset(_surviving_young_words, 0, real_length * sizeof(size_t)); |
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3834 |
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3835 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer; |
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3836 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer; |
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3837 |
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3838 _start = os::elapsedTime(); |
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3839 } |
342 | 3840 |
1709 | 3841 void |
3842 G1ParScanThreadState::print_termination_stats_hdr(outputStream* const st) | |
3843 { | |
3844 st->print_raw_cr("GC Termination Stats"); | |
3845 st->print_raw_cr(" elapsed --strong roots-- -------termination-------" | |
3846 " ------waste (KiB)------"); | |
3847 st->print_raw_cr("thr ms ms % ms % attempts" | |
3848 " total alloc undo"); | |
3849 st->print_raw_cr("--- --------- --------- ------ --------- ------ --------" | |
3850 " ------- ------- -------"); | |
3851 } | |
3852 | |
3853 void | |
3854 G1ParScanThreadState::print_termination_stats(int i, | |
3855 outputStream* const st) const | |
3856 { | |
3857 const double elapsed_ms = elapsed_time() * 1000.0; | |
3858 const double s_roots_ms = strong_roots_time() * 1000.0; | |
3859 const double term_ms = term_time() * 1000.0; | |
3860 st->print_cr("%3d %9.2f %9.2f %6.2f " | |
3861 "%9.2f %6.2f " SIZE_FORMAT_W(8) " " | |
3862 SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7), | |
3863 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
3864 term_ms, term_ms * 100 / elapsed_ms, term_attempts(), | |
3865 (alloc_buffer_waste() + undo_waste()) * HeapWordSize / K, | |
3866 alloc_buffer_waste() * HeapWordSize / K, | |
3867 undo_waste() * HeapWordSize / K); | |
3868 } | |
3869 | |
1862
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3870 #ifdef ASSERT |
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3871 bool G1ParScanThreadState::verify_ref(narrowOop* ref) const { |
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3872 assert(ref != NULL, "invariant"); |
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3873 assert(UseCompressedOops, "sanity"); |
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3874 assert(!has_partial_array_mask(ref), err_msg("ref=" PTR_FORMAT, ref)); |
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3875 oop p = oopDesc::load_decode_heap_oop(ref); |
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3876 assert(_g1h->is_in_g1_reserved(p), |
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3877 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
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3878 return true; |
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3879 } |
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3880 |
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3881 bool G1ParScanThreadState::verify_ref(oop* ref) const { |
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3882 assert(ref != NULL, "invariant"); |
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3883 if (has_partial_array_mask(ref)) { |
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3884 // Must be in the collection set--it's already been copied. |
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3885 oop p = clear_partial_array_mask(ref); |
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3886 assert(_g1h->obj_in_cs(p), |
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3887 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
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3888 } else { |
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3889 oop p = oopDesc::load_decode_heap_oop(ref); |
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3890 assert(_g1h->is_in_g1_reserved(p), |
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3891 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
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3892 } |
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3893 return true; |
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|
3894 } |
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3895 |
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3896 bool G1ParScanThreadState::verify_task(StarTask ref) const { |
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3897 if (ref.is_narrow()) { |
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3898 return verify_ref((narrowOop*) ref); |
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3899 } else { |
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3900 return verify_ref((oop*) ref); |
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3901 } |
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3902 } |
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3903 #endif // ASSERT |
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3904 |
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3905 void G1ParScanThreadState::trim_queue() { |
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3906 StarTask ref; |
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3907 do { |
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3908 // Drain the overflow stack first, so other threads can steal. |
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3909 while (refs()->pop_overflow(ref)) { |
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3910 deal_with_reference(ref); |
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3911 } |
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3912 while (refs()->pop_local(ref)) { |
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3913 deal_with_reference(ref); |
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3914 } |
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3915 } while (!refs()->is_empty()); |
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3916 } |
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3917 |
342 | 3918 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : |
3919 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), | |
3920 _par_scan_state(par_scan_state) { } | |
3921 | |
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3922 template <class T> void G1ParCopyHelper::mark_forwardee(T* p) { |
342 | 3923 // This is called _after_ do_oop_work has been called, hence after |
3924 // the object has been relocated to its new location and *p points | |
3925 // to its new location. | |
3926 | |
845
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3927 T heap_oop = oopDesc::load_heap_oop(p); |
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3928 if (!oopDesc::is_null(heap_oop)) { |
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3929 oop obj = oopDesc::decode_heap_oop(heap_oop); |
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3930 assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj)), |
342 | 3931 "shouldn't still be in the CSet if evacuation didn't fail."); |
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3932 HeapWord* addr = (HeapWord*)obj; |
342 | 3933 if (_g1->is_in_g1_reserved(addr)) |
3934 _cm->grayRoot(oop(addr)); | |
3935 } | |
3936 } | |
3937 | |
3938 oop G1ParCopyHelper::copy_to_survivor_space(oop old) { | |
3939 size_t word_sz = old->size(); | |
3940 HeapRegion* from_region = _g1->heap_region_containing_raw(old); | |
3941 // +1 to make the -1 indexes valid... | |
3942 int young_index = from_region->young_index_in_cset()+1; | |
3943 assert( (from_region->is_young() && young_index > 0) || | |
3944 (!from_region->is_young() && young_index == 0), "invariant" ); | |
3945 G1CollectorPolicy* g1p = _g1->g1_policy(); | |
3946 markOop m = old->mark(); | |
545 | 3947 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
3948 : m->age(); | |
3949 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
342 | 3950 word_sz); |
3951 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
3952 oop obj = oop(obj_ptr); | |
3953 | |
3954 if (obj_ptr == NULL) { | |
3955 // This will either forward-to-self, or detect that someone else has | |
3956 // installed a forwarding pointer. | |
3957 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
3958 return _g1->handle_evacuation_failure_par(cl, old); | |
3959 } | |
3960 | |
526 | 3961 // We're going to allocate linearly, so might as well prefetch ahead. |
3962 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
3963 | |
342 | 3964 oop forward_ptr = old->forward_to_atomic(obj); |
3965 if (forward_ptr == NULL) { | |
3966 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
526 | 3967 if (g1p->track_object_age(alloc_purpose)) { |
3968 // We could simply do obj->incr_age(). However, this causes a | |
3969 // performance issue. obj->incr_age() will first check whether | |
3970 // the object has a displaced mark by checking its mark word; | |
3971 // getting the mark word from the new location of the object | |
3972 // stalls. So, given that we already have the mark word and we | |
3973 // are about to install it anyway, it's better to increase the | |
3974 // age on the mark word, when the object does not have a | |
3975 // displaced mark word. We're not expecting many objects to have | |
3976 // a displaced marked word, so that case is not optimized | |
3977 // further (it could be...) and we simply call obj->incr_age(). | |
3978 | |
3979 if (m->has_displaced_mark_helper()) { | |
3980 // in this case, we have to install the mark word first, | |
3981 // otherwise obj looks to be forwarded (the old mark word, | |
3982 // which contains the forward pointer, was copied) | |
3983 obj->set_mark(m); | |
3984 obj->incr_age(); | |
3985 } else { | |
3986 m = m->incr_age(); | |
545 | 3987 obj->set_mark(m); |
526 | 3988 } |
545 | 3989 _par_scan_state->age_table()->add(obj, word_sz); |
3990 } else { | |
3991 obj->set_mark(m); | |
526 | 3992 } |
3993 | |
342 | 3994 // preserve "next" mark bit |
3995 if (_g1->mark_in_progress() && !_g1->is_obj_ill(old)) { | |
3996 if (!use_local_bitmaps || | |
3997 !_par_scan_state->alloc_buffer(alloc_purpose)->mark(obj_ptr)) { | |
3998 // if we couldn't mark it on the local bitmap (this happens when | |
3999 // the object was not allocated in the GCLab), we have to bite | |
4000 // the bullet and do the standard parallel mark | |
4001 _cm->markAndGrayObjectIfNecessary(obj); | |
4002 } | |
4003 #if 1 | |
4004 if (_g1->isMarkedNext(old)) { | |
4005 _cm->nextMarkBitMap()->parClear((HeapWord*)old); | |
4006 } | |
4007 #endif | |
4008 } | |
4009 | |
4010 size_t* surv_young_words = _par_scan_state->surviving_young_words(); | |
4011 surv_young_words[young_index] += word_sz; | |
4012 | |
4013 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
4014 arrayOop(old)->set_length(0); | |
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4015 oop* old_p = set_partial_array_mask(old); |
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4016 _par_scan_state->push_on_queue(old_p); |
342 | 4017 } else { |
526 | 4018 // No point in using the slower heap_region_containing() method, |
4019 // given that we know obj is in the heap. | |
4020 _scanner->set_region(_g1->heap_region_containing_raw(obj)); | |
342 | 4021 obj->oop_iterate_backwards(_scanner); |
4022 } | |
4023 } else { | |
4024 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
4025 obj = forward_ptr; | |
4026 } | |
4027 return obj; | |
4028 } | |
4029 | |
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4030 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_forwardee> |
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4031 template <class T> |
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4032 void G1ParCopyClosure <do_gen_barrier, barrier, do_mark_forwardee> |
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4033 ::do_oop_work(T* p) { |
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4034 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 4035 assert(barrier != G1BarrierRS || obj != NULL, |
4036 "Precondition: G1BarrierRS implies obj is nonNull"); | |
4037 | |
526 | 4038 // here the null check is implicit in the cset_fast_test() test |
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4039 if (_g1->in_cset_fast_test(obj)) { |
342 | 4040 #if G1_REM_SET_LOGGING |
526 | 4041 gclog_or_tty->print_cr("Loc "PTR_FORMAT" contains pointer "PTR_FORMAT" " |
4042 "into CS.", p, (void*) obj); | |
342 | 4043 #endif |
526 | 4044 if (obj->is_forwarded()) { |
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4045 oopDesc::encode_store_heap_oop(p, obj->forwardee()); |
526 | 4046 } else { |
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4047 oop copy_oop = copy_to_survivor_space(obj); |
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4048 oopDesc::encode_store_heap_oop(p, copy_oop); |
342 | 4049 } |
526 | 4050 // When scanning the RS, we only care about objs in CS. |
4051 if (barrier == G1BarrierRS) { | |
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4052 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
342 | 4053 } |
526 | 4054 } |
4055 | |
4056 if (barrier == G1BarrierEvac && obj != NULL) { | |
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4057 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
526 | 4058 } |
4059 | |
4060 if (do_gen_barrier && obj != NULL) { | |
4061 par_do_barrier(p); | |
4062 } | |
4063 } | |
4064 | |
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4065 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(oop* p); |
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4066 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(narrowOop* p); |
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4067 |
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4068 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
526 | 4069 assert(has_partial_array_mask(p), "invariant"); |
4070 oop old = clear_partial_array_mask(p); | |
342 | 4071 assert(old->is_objArray(), "must be obj array"); |
4072 assert(old->is_forwarded(), "must be forwarded"); | |
4073 assert(Universe::heap()->is_in_reserved(old), "must be in heap."); | |
4074 | |
4075 objArrayOop obj = objArrayOop(old->forwardee()); | |
4076 assert((void*)old != (void*)old->forwardee(), "self forwarding here?"); | |
4077 // Process ParGCArrayScanChunk elements now | |
4078 // and push the remainder back onto queue | |
4079 int start = arrayOop(old)->length(); | |
4080 int end = obj->length(); | |
4081 int remainder = end - start; | |
4082 assert(start <= end, "just checking"); | |
4083 if (remainder > 2 * ParGCArrayScanChunk) { | |
4084 // Test above combines last partial chunk with a full chunk | |
4085 end = start + ParGCArrayScanChunk; | |
4086 arrayOop(old)->set_length(end); | |
4087 // Push remainder. | |
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4088 oop* old_p = set_partial_array_mask(old); |
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4089 assert(arrayOop(old)->length() < obj->length(), "Empty push?"); |
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4090 _par_scan_state->push_on_queue(old_p); |
342 | 4091 } else { |
4092 // Restore length so that the heap remains parsable in | |
4093 // case of evacuation failure. | |
4094 arrayOop(old)->set_length(end); | |
4095 } | |
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4096 _scanner.set_region(_g1->heap_region_containing_raw(obj)); |
342 | 4097 // process our set of indices (include header in first chunk) |
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4098 obj->oop_iterate_range(&_scanner, start, end); |
342 | 4099 } |
4100 | |
4101 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
4102 protected: | |
4103 G1CollectedHeap* _g1h; | |
4104 G1ParScanThreadState* _par_scan_state; | |
4105 RefToScanQueueSet* _queues; | |
4106 ParallelTaskTerminator* _terminator; | |
4107 | |
4108 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
4109 RefToScanQueueSet* queues() { return _queues; } | |
4110 ParallelTaskTerminator* terminator() { return _terminator; } | |
4111 | |
4112 public: | |
4113 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
4114 G1ParScanThreadState* par_scan_state, | |
4115 RefToScanQueueSet* queues, | |
4116 ParallelTaskTerminator* terminator) | |
4117 : _g1h(g1h), _par_scan_state(par_scan_state), | |
4118 _queues(queues), _terminator(terminator) {} | |
4119 | |
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4120 void do_void(); |
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4121 |
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4122 private: |
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4123 inline bool offer_termination(); |
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4124 }; |
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4125 |
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4126 bool G1ParEvacuateFollowersClosure::offer_termination() { |
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4127 G1ParScanThreadState* const pss = par_scan_state(); |
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4128 pss->start_term_time(); |
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4129 const bool res = terminator()->offer_termination(); |
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4130 pss->end_term_time(); |
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4131 return res; |
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4132 } |
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4133 |
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4134 void G1ParEvacuateFollowersClosure::do_void() { |
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4135 StarTask stolen_task; |
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4136 G1ParScanThreadState* const pss = par_scan_state(); |
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4137 pss->trim_queue(); |
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4138 |
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4139 do { |
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4140 while (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
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4141 assert(pss->verify_task(stolen_task), "sanity"); |
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4142 if (stolen_task.is_narrow()) { |
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4143 pss->deal_with_reference((narrowOop*) stolen_task); |
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4144 } else { |
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4145 pss->deal_with_reference((oop*) stolen_task); |
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4146 } |
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4147 |
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4148 // We've just processed a reference and we might have made |
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4149 // available new entries on the queues. So we have to make sure |
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4150 // we drain the queues as necessary. |
342 | 4151 pss->trim_queue(); |
4152 } | |
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4153 } while (!offer_termination()); |
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4154 |
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4155 pss->retire_alloc_buffers(); |
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4156 } |
342 | 4157 |
4158 class G1ParTask : public AbstractGangTask { | |
4159 protected: | |
4160 G1CollectedHeap* _g1h; | |
4161 RefToScanQueueSet *_queues; | |
4162 ParallelTaskTerminator _terminator; | |
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4163 int _n_workers; |
342 | 4164 |
4165 Mutex _stats_lock; | |
4166 Mutex* stats_lock() { return &_stats_lock; } | |
4167 | |
4168 size_t getNCards() { | |
4169 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
4170 / G1BlockOffsetSharedArray::N_bytes; | |
4171 } | |
4172 | |
4173 public: | |
4174 G1ParTask(G1CollectedHeap* g1h, int workers, RefToScanQueueSet *task_queues) | |
4175 : AbstractGangTask("G1 collection"), | |
4176 _g1h(g1h), | |
4177 _queues(task_queues), | |
4178 _terminator(workers, _queues), | |
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4179 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true), |
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4180 _n_workers(workers) |
342 | 4181 {} |
4182 | |
4183 RefToScanQueueSet* queues() { return _queues; } | |
4184 | |
4185 RefToScanQueue *work_queue(int i) { | |
4186 return queues()->queue(i); | |
4187 } | |
4188 | |
4189 void work(int i) { | |
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4190 if (i >= _n_workers) return; // no work needed this round |
1611 | 4191 |
4192 double start_time_ms = os::elapsedTime() * 1000.0; | |
4193 _g1h->g1_policy()->record_gc_worker_start_time(i, start_time_ms); | |
4194 | |
342 | 4195 ResourceMark rm; |
4196 HandleMark hm; | |
4197 | |
526 | 4198 G1ParScanThreadState pss(_g1h, i); |
4199 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss); | |
4200 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss); | |
4201 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss); | |
342 | 4202 |
4203 pss.set_evac_closure(&scan_evac_cl); | |
4204 pss.set_evac_failure_closure(&evac_failure_cl); | |
4205 pss.set_partial_scan_closure(&partial_scan_cl); | |
4206 | |
4207 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss); | |
4208 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss); | |
4209 G1ParScanHeapRSClosure only_scan_heap_rs_cl(_g1h, &pss); | |
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4210 G1ParPushHeapRSClosure push_heap_rs_cl(_g1h, &pss); |
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4211 |
342 | 4212 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss); |
4213 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss); | |
4214 G1ParScanAndMarkHeapRSClosure scan_mark_heap_rs_cl(_g1h, &pss); | |
4215 | |
4216 OopsInHeapRegionClosure *scan_root_cl; | |
4217 OopsInHeapRegionClosure *scan_perm_cl; | |
4218 | |
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4219 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
342 | 4220 scan_root_cl = &scan_mark_root_cl; |
4221 scan_perm_cl = &scan_mark_perm_cl; | |
4222 } else { | |
4223 scan_root_cl = &only_scan_root_cl; | |
4224 scan_perm_cl = &only_scan_perm_cl; | |
4225 } | |
4226 | |
4227 pss.start_strong_roots(); | |
4228 _g1h->g1_process_strong_roots(/* not collecting perm */ false, | |
4229 SharedHeap::SO_AllClasses, | |
4230 scan_root_cl, | |
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4231 &push_heap_rs_cl, |
342 | 4232 scan_perm_cl, |
4233 i); | |
4234 pss.end_strong_roots(); | |
4235 { | |
4236 double start = os::elapsedTime(); | |
4237 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); | |
4238 evac.do_void(); | |
4239 double elapsed_ms = (os::elapsedTime()-start)*1000.0; | |
4240 double term_ms = pss.term_time()*1000.0; | |
4241 _g1h->g1_policy()->record_obj_copy_time(i, elapsed_ms-term_ms); | |
1611 | 4242 _g1h->g1_policy()->record_termination(i, term_ms, pss.term_attempts()); |
342 | 4243 } |
1282 | 4244 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
342 | 4245 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
4246 | |
4247 // Clean up any par-expanded rem sets. | |
4248 HeapRegionRemSet::par_cleanup(); | |
4249 | |
4250 if (ParallelGCVerbose) { | |
1709 | 4251 MutexLocker x(stats_lock()); |
4252 pss.print_termination_stats(i); | |
342 | 4253 } |
4254 | |
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4255 assert(pss.refs()->is_empty(), "should be empty"); |
1611 | 4256 double end_time_ms = os::elapsedTime() * 1000.0; |
4257 _g1h->g1_policy()->record_gc_worker_end_time(i, end_time_ms); | |
342 | 4258 } |
4259 }; | |
4260 | |
4261 // *** Common G1 Evacuation Stuff | |
4262 | |
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4263 // This method is run in a GC worker. |
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4264 |
342 | 4265 void |
4266 G1CollectedHeap:: | |
4267 g1_process_strong_roots(bool collecting_perm_gen, | |
4268 SharedHeap::ScanningOption so, | |
4269 OopClosure* scan_non_heap_roots, | |
4270 OopsInHeapRegionClosure* scan_rs, | |
4271 OopsInGenClosure* scan_perm, | |
4272 int worker_i) { | |
4273 // First scan the strong roots, including the perm gen. | |
4274 double ext_roots_start = os::elapsedTime(); | |
4275 double closure_app_time_sec = 0.0; | |
4276 | |
4277 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
4278 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
4279 buf_scan_perm.set_generation(perm_gen()); | |
4280 | |
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4281 // Walk the code cache w/o buffering, because StarTask cannot handle |
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4282 // unaligned oop locations. |
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4283 CodeBlobToOopClosure eager_scan_code_roots(scan_non_heap_roots, /*do_marking=*/ true); |
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4284 |
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4285 process_strong_roots(false, // no scoping; this is parallel code |
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4286 collecting_perm_gen, so, |
342 | 4287 &buf_scan_non_heap_roots, |
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4288 &eager_scan_code_roots, |
342 | 4289 &buf_scan_perm); |
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4290 |
342 | 4291 // Finish up any enqueued closure apps. |
4292 buf_scan_non_heap_roots.done(); | |
4293 buf_scan_perm.done(); | |
4294 double ext_roots_end = os::elapsedTime(); | |
4295 g1_policy()->reset_obj_copy_time(worker_i); | |
4296 double obj_copy_time_sec = | |
4297 buf_scan_non_heap_roots.closure_app_seconds() + | |
4298 buf_scan_perm.closure_app_seconds(); | |
4299 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); | |
4300 double ext_root_time_ms = | |
4301 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
4302 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); | |
4303 | |
4304 // Scan strong roots in mark stack. | |
4305 if (!_process_strong_tasks->is_task_claimed(G1H_PS_mark_stack_oops_do)) { | |
4306 concurrent_mark()->oops_do(scan_non_heap_roots); | |
4307 } | |
4308 double mark_stack_scan_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; | |
4309 g1_policy()->record_mark_stack_scan_time(worker_i, mark_stack_scan_ms); | |
4310 | |
4311 // XXX What should this be doing in the parallel case? | |
4312 g1_policy()->record_collection_pause_end_CH_strong_roots(); | |
4313 // Now scan the complement of the collection set. | |
4314 if (scan_rs != NULL) { | |
4315 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
4316 } | |
4317 // Finish with the ref_processor roots. | |
4318 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { | |
4319 ref_processor()->oops_do(scan_non_heap_roots); | |
4320 } | |
4321 g1_policy()->record_collection_pause_end_G1_strong_roots(); | |
4322 _process_strong_tasks->all_tasks_completed(); | |
4323 } | |
4324 | |
4325 void | |
4326 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
4327 OopClosure* non_root_closure) { | |
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4328 CodeBlobToOopClosure roots_in_blobs(root_closure, /*do_marking=*/ false); |
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4329 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs, non_root_closure); |
342 | 4330 } |
4331 | |
4332 | |
4333 class SaveMarksClosure: public HeapRegionClosure { | |
4334 public: | |
4335 bool doHeapRegion(HeapRegion* r) { | |
4336 r->save_marks(); | |
4337 return false; | |
4338 } | |
4339 }; | |
4340 | |
4341 void G1CollectedHeap::save_marks() { | |
1833
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4342 if (!CollectedHeap::use_parallel_gc_threads()) { |
342 | 4343 SaveMarksClosure sm; |
4344 heap_region_iterate(&sm); | |
4345 } | |
4346 // We do this even in the parallel case | |
4347 perm_gen()->save_marks(); | |
4348 } | |
4349 | |
4350 void G1CollectedHeap::evacuate_collection_set() { | |
4351 set_evacuation_failed(false); | |
4352 | |
4353 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
4354 concurrent_g1_refine()->set_use_cache(false); | |
889 | 4355 concurrent_g1_refine()->clear_hot_cache_claimed_index(); |
4356 | |
342 | 4357 int n_workers = (ParallelGCThreads > 0 ? workers()->total_workers() : 1); |
4358 set_par_threads(n_workers); | |
4359 G1ParTask g1_par_task(this, n_workers, _task_queues); | |
4360 | |
4361 init_for_evac_failure(NULL); | |
4362 | |
4363 rem_set()->prepare_for_younger_refs_iterate(true); | |
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4364 |
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4365 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
342 | 4366 double start_par = os::elapsedTime(); |
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4367 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 4368 // The individual threads will set their evac-failure closures. |
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4369 StrongRootsScope srs(this); |
1709 | 4370 if (ParallelGCVerbose) G1ParScanThreadState::print_termination_stats_hdr(); |
342 | 4371 workers()->run_task(&g1_par_task); |
4372 } else { | |
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4373 StrongRootsScope srs(this); |
342 | 4374 g1_par_task.work(0); |
4375 } | |
4376 | |
4377 double par_time = (os::elapsedTime() - start_par) * 1000.0; | |
4378 g1_policy()->record_par_time(par_time); | |
4379 set_par_threads(0); | |
4380 // Is this the right thing to do here? We don't save marks | |
4381 // on individual heap regions when we allocate from | |
4382 // them in parallel, so this seems like the correct place for this. | |
545 | 4383 retire_all_alloc_regions(); |
342 | 4384 { |
4385 G1IsAliveClosure is_alive(this); | |
4386 G1KeepAliveClosure keep_alive(this); | |
4387 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
4388 } | |
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4389 release_gc_alloc_regions(false /* totally */); |
342 | 4390 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); |
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4391 |
889 | 4392 concurrent_g1_refine()->clear_hot_cache(); |
342 | 4393 concurrent_g1_refine()->set_use_cache(true); |
4394 | |
4395 finalize_for_evac_failure(); | |
4396 | |
4397 // Must do this before removing self-forwarding pointers, which clears | |
4398 // the per-region evac-failure flags. | |
4399 concurrent_mark()->complete_marking_in_collection_set(); | |
4400 | |
4401 if (evacuation_failed()) { | |
4402 remove_self_forwarding_pointers(); | |
4403 if (PrintGCDetails) { | |
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4404 gclog_or_tty->print(" (to-space overflow)"); |
342 | 4405 } else if (PrintGC) { |
4406 gclog_or_tty->print("--"); | |
4407 } | |
4408 } | |
4409 | |
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4410 if (G1DeferredRSUpdate) { |
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4411 RedirtyLoggedCardTableEntryFastClosure redirty; |
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4412 dirty_card_queue_set().set_closure(&redirty); |
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4413 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
1111 | 4414 |
4415 DirtyCardQueueSet& dcq = JavaThread::dirty_card_queue_set(); | |
4416 dcq.merge_bufferlists(&dirty_card_queue_set()); | |
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4417 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
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4418 } |
342 | 4419 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
4420 } | |
4421 | |
4422 void G1CollectedHeap::free_region(HeapRegion* hr) { | |
4423 size_t pre_used = 0; | |
4424 size_t cleared_h_regions = 0; | |
4425 size_t freed_regions = 0; | |
4426 UncleanRegionList local_list; | |
4427 | |
4428 HeapWord* start = hr->bottom(); | |
4429 HeapWord* end = hr->prev_top_at_mark_start(); | |
4430 size_t used_bytes = hr->used(); | |
4431 size_t live_bytes = hr->max_live_bytes(); | |
4432 if (used_bytes > 0) { | |
4433 guarantee( live_bytes <= used_bytes, "invariant" ); | |
4434 } else { | |
4435 guarantee( live_bytes == 0, "invariant" ); | |
4436 } | |
4437 | |
4438 size_t garbage_bytes = used_bytes - live_bytes; | |
4439 if (garbage_bytes > 0) | |
4440 g1_policy()->decrease_known_garbage_bytes(garbage_bytes); | |
4441 | |
4442 free_region_work(hr, pre_used, cleared_h_regions, freed_regions, | |
4443 &local_list); | |
4444 finish_free_region_work(pre_used, cleared_h_regions, freed_regions, | |
4445 &local_list); | |
4446 } | |
4447 | |
4448 void | |
4449 G1CollectedHeap::free_region_work(HeapRegion* hr, | |
4450 size_t& pre_used, | |
4451 size_t& cleared_h_regions, | |
4452 size_t& freed_regions, | |
4453 UncleanRegionList* list, | |
4454 bool par) { | |
4455 pre_used += hr->used(); | |
4456 if (hr->isHumongous()) { | |
4457 assert(hr->startsHumongous(), | |
4458 "Only the start of a humongous region should be freed."); | |
4459 int ind = _hrs->find(hr); | |
4460 assert(ind != -1, "Should have an index."); | |
4461 // Clear the start region. | |
4462 hr->hr_clear(par, true /*clear_space*/); | |
4463 list->insert_before_head(hr); | |
4464 cleared_h_regions++; | |
4465 freed_regions++; | |
4466 // Clear any continued regions. | |
4467 ind++; | |
4468 while ((size_t)ind < n_regions()) { | |
4469 HeapRegion* hrc = _hrs->at(ind); | |
4470 if (!hrc->continuesHumongous()) break; | |
4471 // Otherwise, does continue the H region. | |
4472 assert(hrc->humongous_start_region() == hr, "Huh?"); | |
4473 hrc->hr_clear(par, true /*clear_space*/); | |
4474 cleared_h_regions++; | |
4475 freed_regions++; | |
4476 list->insert_before_head(hrc); | |
4477 ind++; | |
4478 } | |
4479 } else { | |
4480 hr->hr_clear(par, true /*clear_space*/); | |
4481 list->insert_before_head(hr); | |
4482 freed_regions++; | |
4483 // If we're using clear2, this should not be enabled. | |
4484 // assert(!hr->in_cohort(), "Can't be both free and in a cohort."); | |
4485 } | |
4486 } | |
4487 | |
4488 void G1CollectedHeap::finish_free_region_work(size_t pre_used, | |
4489 size_t cleared_h_regions, | |
4490 size_t freed_regions, | |
4491 UncleanRegionList* list) { | |
4492 if (list != NULL && list->sz() > 0) { | |
4493 prepend_region_list_on_unclean_list(list); | |
4494 } | |
4495 // Acquire a lock, if we're parallel, to update possibly-shared | |
4496 // variables. | |
4497 Mutex* lock = (n_par_threads() > 0) ? ParGCRareEvent_lock : NULL; | |
4498 { | |
4499 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); | |
4500 _summary_bytes_used -= pre_used; | |
4501 _num_humongous_regions -= (int) cleared_h_regions; | |
4502 _free_regions += freed_regions; | |
4503 } | |
4504 } | |
4505 | |
4506 | |
4507 void G1CollectedHeap::dirtyCardsForYoungRegions(CardTableModRefBS* ct_bs, HeapRegion* list) { | |
4508 while (list != NULL) { | |
4509 guarantee( list->is_young(), "invariant" ); | |
4510 | |
4511 HeapWord* bottom = list->bottom(); | |
4512 HeapWord* end = list->end(); | |
4513 MemRegion mr(bottom, end); | |
4514 ct_bs->dirty(mr); | |
4515 | |
4516 list = list->get_next_young_region(); | |
4517 } | |
4518 } | |
4519 | |
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4520 |
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4521 class G1ParCleanupCTTask : public AbstractGangTask { |
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4522 CardTableModRefBS* _ct_bs; |
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4523 G1CollectedHeap* _g1h; |
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4524 HeapRegion* volatile _su_head; |
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4525 public: |
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4526 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
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4527 G1CollectedHeap* g1h, |
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4528 HeapRegion* survivor_list) : |
796
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4529 AbstractGangTask("G1 Par Cleanup CT Task"), |
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4530 _ct_bs(ct_bs), |
940
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4531 _g1h(g1h), |
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4532 _su_head(survivor_list) |
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4533 { } |
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4534 |
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4535 void work(int i) { |
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4536 HeapRegion* r; |
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4537 while (r = _g1h->pop_dirty_cards_region()) { |
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4538 clear_cards(r); |
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4539 } |
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4540 // Redirty the cards of the survivor regions. |
940
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4541 dirty_list(&this->_su_head); |
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4542 } |
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4543 |
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4544 void clear_cards(HeapRegion* r) { |
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4545 // Cards for Survivor regions will be dirtied later. |
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4546 if (!r->is_survivor()) { |
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4547 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
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4548 } |
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4549 } |
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4550 |
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4551 void dirty_list(HeapRegion* volatile * head_ptr) { |
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4552 HeapRegion* head; |
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4553 do { |
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4554 // Pop region off the list. |
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4555 head = *head_ptr; |
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4556 if (head != NULL) { |
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4557 HeapRegion* r = (HeapRegion*) |
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4558 Atomic::cmpxchg_ptr(head->get_next_young_region(), head_ptr, head); |
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4559 if (r == head) { |
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4560 assert(!r->isHumongous(), "Humongous regions shouldn't be on survivor list"); |
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4561 _ct_bs->dirty(MemRegion(r->bottom(), r->end())); |
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4562 } |
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4563 } |
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4564 } while (*head_ptr != NULL); |
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4565 } |
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4566 }; |
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4567 |
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4568 |
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4569 #ifndef PRODUCT |
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4570 class G1VerifyCardTableCleanup: public HeapRegionClosure { |
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4571 CardTableModRefBS* _ct_bs; |
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4572 public: |
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4573 G1VerifyCardTableCleanup(CardTableModRefBS* ct_bs) |
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4574 : _ct_bs(ct_bs) |
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4575 { } |
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4576 virtual bool doHeapRegion(HeapRegion* r) |
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|
4577 { |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
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diff
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|
4578 MemRegion mr(r->bottom(), r->end()); |
1394
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
4579 if (r->is_survivor()) { |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
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936
diff
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|
4580 _ct_bs->verify_dirty_region(mr); |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
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diff
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|
4581 } else { |
8624da129f0b
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diff
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|
4582 _ct_bs->verify_clean_region(mr); |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
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|
4583 } |
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apetrusenko
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936
diff
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|
4584 return false; |
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apetrusenko
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diff
changeset
|
4585 } |
8624da129f0b
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diff
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|
4586 }; |
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|
4587 #endif |
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|
4588 |
342 | 4589 void G1CollectedHeap::cleanUpCardTable() { |
4590 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
4591 double start = os::elapsedTime(); | |
4592 | |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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parents:
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diff
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|
4593 // Iterate over the dirty cards region list. |
940
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|
4594 G1ParCleanupCTTask cleanup_task(ct_bs, this, |
8624da129f0b
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|
4595 _young_list->first_survivor_region()); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
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|
4596 |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
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diff
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|
4597 if (ParallelGCThreads > 0) { |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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|
4598 set_par_threads(workers()->total_workers()); |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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diff
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|
4599 workers()->run_task(&cleanup_task); |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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diff
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|
4600 set_par_threads(0); |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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diff
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|
4601 } else { |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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diff
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|
4602 while (_dirty_cards_region_list) { |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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diff
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|
4603 HeapRegion* r = _dirty_cards_region_list; |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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|
4604 cleanup_task.clear_cards(r); |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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|
4605 _dirty_cards_region_list = r->get_next_dirty_cards_region(); |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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parents:
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diff
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|
4606 if (_dirty_cards_region_list == r) { |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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|
4607 // The last region. |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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diff
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|
4608 _dirty_cards_region_list = NULL; |
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6819065: G1: eliminate high serial card table clearing time
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|
4609 } |
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diff
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|
4610 r->set_next_dirty_cards_region(NULL); |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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|
4611 } |
1394
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
4612 // now, redirty the cards of the survivor regions |
940
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|
4613 // (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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|
4614 // all regions and then clearing / dirtying as appropriate) |
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|
4615 dirtyCardsForYoungRegions(ct_bs, _young_list->first_survivor_region()); |
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|
4616 } |
1394
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
4617 |
342 | 4618 double elapsed = os::elapsedTime() - start; |
4619 g1_policy()->record_clear_ct_time( elapsed * 1000.0); | |
940
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6841313: G1: dirty cards of survivor regions in parallel
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|
4620 #ifndef PRODUCT |
8624da129f0b
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|
4621 if (G1VerifyCTCleanup || VerifyAfterGC) { |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
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|
4622 G1VerifyCardTableCleanup cleanup_verifier(ct_bs); |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
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|
4623 heap_region_iterate(&cleanup_verifier); |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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|
4624 } |
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diff
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|
4625 #endif |
342 | 4626 } |
4627 | |
4628 void G1CollectedHeap::do_collection_pause_if_appropriate(size_t word_size) { | |
4629 if (g1_policy()->should_do_collection_pause(word_size)) { | |
4630 do_collection_pause(); | |
4631 } | |
4632 } | |
4633 | |
4634 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
4635 double young_time_ms = 0.0; | |
4636 double non_young_time_ms = 0.0; | |
4637 | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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|
4638 // Since the collection set is a superset of the the young list, |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
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|
4639 // all we need to do to clear the young list is clear its |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
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|
4640 // head and length, and unlink any young regions in the code below |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
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|
4641 _young_list->clear(); |
1316cec51b4d
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diff
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|
4642 |
342 | 4643 G1CollectorPolicy* policy = g1_policy(); |
4644 | |
4645 double start_sec = os::elapsedTime(); | |
4646 bool non_young = true; | |
4647 | |
4648 HeapRegion* cur = cs_head; | |
4649 int age_bound = -1; | |
4650 size_t rs_lengths = 0; | |
4651 | |
4652 while (cur != NULL) { | |
4653 if (non_young) { | |
4654 if (cur->is_young()) { | |
4655 double end_sec = os::elapsedTime(); | |
4656 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
4657 non_young_time_ms += elapsed_ms; | |
4658 | |
4659 start_sec = os::elapsedTime(); | |
4660 non_young = false; | |
4661 } | |
4662 } else { | |
4663 if (!cur->is_on_free_list()) { | |
4664 double end_sec = os::elapsedTime(); | |
4665 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
4666 young_time_ms += elapsed_ms; | |
4667 | |
4668 start_sec = os::elapsedTime(); | |
4669 non_young = true; | |
4670 } | |
4671 } | |
4672 | |
4673 rs_lengths += cur->rem_set()->occupied(); | |
4674 | |
4675 HeapRegion* next = cur->next_in_collection_set(); | |
4676 assert(cur->in_collection_set(), "bad CS"); | |
4677 cur->set_next_in_collection_set(NULL); | |
4678 cur->set_in_collection_set(false); | |
4679 | |
4680 if (cur->is_young()) { | |
4681 int index = cur->young_index_in_cset(); | |
4682 guarantee( index != -1, "invariant" ); | |
4683 guarantee( (size_t)index < policy->young_cset_length(), "invariant" ); | |
4684 size_t words_survived = _surviving_young_words[index]; | |
4685 cur->record_surv_words_in_group(words_survived); | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
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|
4686 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4687 // At this point the we have 'popped' cur from the collection set |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4688 // (linked via next_in_collection_set()) but it is still in the |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4689 // young list (linked via next_young_region()). Clear the |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4690 // _next_young_region field. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
4691 cur->set_next_young_region(NULL); |
342 | 4692 } else { |
4693 int index = cur->young_index_in_cset(); | |
4694 guarantee( index == -1, "invariant" ); | |
4695 } | |
4696 | |
4697 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
4698 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
4699 "invariant" ); | |
4700 | |
4701 if (!cur->evacuation_failed()) { | |
4702 // And the region is empty. | |
4703 assert(!cur->is_empty(), | |
4704 "Should not have empty regions in a CS."); | |
4705 free_region(cur); | |
4706 } else { | |
4707 cur->uninstall_surv_rate_group(); | |
4708 if (cur->is_young()) | |
4709 cur->set_young_index_in_cset(-1); | |
4710 cur->set_not_young(); | |
4711 cur->set_evacuation_failed(false); | |
4712 } | |
4713 cur = next; | |
4714 } | |
4715 | |
4716 policy->record_max_rs_lengths(rs_lengths); | |
4717 policy->cset_regions_freed(); | |
4718 | |
4719 double end_sec = os::elapsedTime(); | |
4720 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
4721 if (non_young) | |
4722 non_young_time_ms += elapsed_ms; | |
4723 else | |
4724 young_time_ms += elapsed_ms; | |
4725 | |
4726 policy->record_young_free_cset_time_ms(young_time_ms); | |
4727 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
4728 } | |
4729 | |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4730 // This routine is similar to the above but does not record |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4731 // any policy statistics or update free lists; we are abandoning |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4732 // the current incremental collection set in preparation of a |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4733 // full collection. After the full GC we will start to build up |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4734 // the incremental collection set again. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4735 // This is only called when we're doing a full collection |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4736 // and is immediately followed by the tearing down of the young list. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4737 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4738 void G1CollectedHeap::abandon_collection_set(HeapRegion* cs_head) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4739 HeapRegion* cur = cs_head; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4740 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4741 while (cur != NULL) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4742 HeapRegion* next = cur->next_in_collection_set(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4743 assert(cur->in_collection_set(), "bad CS"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4744 cur->set_next_in_collection_set(NULL); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
4745 cur->set_in_collection_set(false); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
4746 cur->set_young_index_in_cset(-1); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4747 cur = next; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4748 } |
1316cec51b4d
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parents:
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diff
changeset
|
4749 } |
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diff
changeset
|
4750 |
342 | 4751 HeapRegion* |
4752 G1CollectedHeap::alloc_region_from_unclean_list_locked(bool zero_filled) { | |
4753 assert(ZF_mon->owned_by_self(), "Precondition"); | |
4754 HeapRegion* res = pop_unclean_region_list_locked(); | |
4755 if (res != NULL) { | |
4756 assert(!res->continuesHumongous() && | |
4757 res->zero_fill_state() != HeapRegion::Allocated, | |
4758 "Only free regions on unclean list."); | |
4759 if (zero_filled) { | |
4760 res->ensure_zero_filled_locked(); | |
4761 res->set_zero_fill_allocated(); | |
4762 } | |
4763 } | |
4764 return res; | |
4765 } | |
4766 | |
4767 HeapRegion* G1CollectedHeap::alloc_region_from_unclean_list(bool zero_filled) { | |
4768 MutexLockerEx zx(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4769 return alloc_region_from_unclean_list_locked(zero_filled); | |
4770 } | |
4771 | |
4772 void G1CollectedHeap::put_region_on_unclean_list(HeapRegion* r) { | |
4773 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4774 put_region_on_unclean_list_locked(r); | |
4775 if (should_zf()) ZF_mon->notify_all(); // Wake up ZF thread. | |
4776 } | |
4777 | |
4778 void G1CollectedHeap::set_unclean_regions_coming(bool b) { | |
4779 MutexLockerEx x(Cleanup_mon); | |
4780 set_unclean_regions_coming_locked(b); | |
4781 } | |
4782 | |
4783 void G1CollectedHeap::set_unclean_regions_coming_locked(bool b) { | |
4784 assert(Cleanup_mon->owned_by_self(), "Precondition"); | |
4785 _unclean_regions_coming = b; | |
4786 // Wake up mutator threads that might be waiting for completeCleanup to | |
4787 // finish. | |
4788 if (!b) Cleanup_mon->notify_all(); | |
4789 } | |
4790 | |
4791 void G1CollectedHeap::wait_for_cleanup_complete() { | |
4792 MutexLockerEx x(Cleanup_mon); | |
4793 wait_for_cleanup_complete_locked(); | |
4794 } | |
4795 | |
4796 void G1CollectedHeap::wait_for_cleanup_complete_locked() { | |
4797 assert(Cleanup_mon->owned_by_self(), "precondition"); | |
4798 while (_unclean_regions_coming) { | |
4799 Cleanup_mon->wait(); | |
4800 } | |
4801 } | |
4802 | |
4803 void | |
4804 G1CollectedHeap::put_region_on_unclean_list_locked(HeapRegion* r) { | |
4805 assert(ZF_mon->owned_by_self(), "precondition."); | |
1545
cc387008223e
6921317: (partial) G1: assert(top() == bottom() || zfs == Allocated,"Region must be empty, or we must be setting it to
apetrusenko
parents:
1489
diff
changeset
|
4806 #ifdef ASSERT |
cc387008223e
6921317: (partial) G1: assert(top() == bottom() || zfs == Allocated,"Region must be empty, or we must be setting it to
apetrusenko
parents:
1489
diff
changeset
|
4807 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
apetrusenko
parents:
1489
diff
changeset
|
4808 ResourceMark rm; |
cc387008223e
6921317: (partial) G1: assert(top() == bottom() || zfs == Allocated,"Region must be empty, or we must be setting it to
apetrusenko
parents:
1489
diff
changeset
|
4809 stringStream region_str; |
cc387008223e
6921317: (partial) G1: assert(top() == bottom() || zfs == Allocated,"Region must be empty, or we must be setting it to
apetrusenko
parents:
1489
diff
changeset
|
4810 print_on(®ion_str); |
cc387008223e
6921317: (partial) G1: assert(top() == bottom() || zfs == Allocated,"Region must be empty, or we must be setting it to
apetrusenko
parents:
1489
diff
changeset
|
4811 assert(!r->is_gc_alloc_region(), err_msg("Unexpected GC allocation region: %s", |
cc387008223e
6921317: (partial) G1: assert(top() == bottom() || zfs == Allocated,"Region must be empty, or we must be setting it to
apetrusenko
parents:
1489
diff
changeset
|
4812 region_str.as_string())); |
cc387008223e
6921317: (partial) G1: assert(top() == bottom() || zfs == Allocated,"Region must be empty, or we must be setting it to
apetrusenko
parents:
1489
diff
changeset
|
4813 } |
cc387008223e
6921317: (partial) G1: assert(top() == bottom() || zfs == Allocated,"Region must be empty, or we must be setting it to
apetrusenko
parents:
1489
diff
changeset
|
4814 #endif |
342 | 4815 _unclean_region_list.insert_before_head(r); |
4816 } | |
4817 | |
4818 void | |
4819 G1CollectedHeap::prepend_region_list_on_unclean_list(UncleanRegionList* list) { | |
4820 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4821 prepend_region_list_on_unclean_list_locked(list); | |
4822 if (should_zf()) ZF_mon->notify_all(); // Wake up ZF thread. | |
4823 } | |
4824 | |
4825 void | |
4826 G1CollectedHeap:: | |
4827 prepend_region_list_on_unclean_list_locked(UncleanRegionList* list) { | |
4828 assert(ZF_mon->owned_by_self(), "precondition."); | |
4829 _unclean_region_list.prepend_list(list); | |
4830 } | |
4831 | |
4832 HeapRegion* G1CollectedHeap::pop_unclean_region_list_locked() { | |
4833 assert(ZF_mon->owned_by_self(), "precondition."); | |
4834 HeapRegion* res = _unclean_region_list.pop(); | |
4835 if (res != NULL) { | |
4836 // Inform ZF thread that there's a new unclean head. | |
4837 if (_unclean_region_list.hd() != NULL && should_zf()) | |
4838 ZF_mon->notify_all(); | |
4839 } | |
4840 return res; | |
4841 } | |
4842 | |
4843 HeapRegion* G1CollectedHeap::peek_unclean_region_list_locked() { | |
4844 assert(ZF_mon->owned_by_self(), "precondition."); | |
4845 return _unclean_region_list.hd(); | |
4846 } | |
4847 | |
4848 | |
4849 bool G1CollectedHeap::move_cleaned_region_to_free_list_locked() { | |
4850 assert(ZF_mon->owned_by_self(), "Precondition"); | |
4851 HeapRegion* r = peek_unclean_region_list_locked(); | |
4852 if (r != NULL && r->zero_fill_state() == HeapRegion::ZeroFilled) { | |
4853 // Result of below must be equal to "r", since we hold the lock. | |
4854 (void)pop_unclean_region_list_locked(); | |
4855 put_free_region_on_list_locked(r); | |
4856 return true; | |
4857 } else { | |
4858 return false; | |
4859 } | |
4860 } | |
4861 | |
4862 bool G1CollectedHeap::move_cleaned_region_to_free_list() { | |
4863 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4864 return move_cleaned_region_to_free_list_locked(); | |
4865 } | |
4866 | |
4867 | |
4868 void G1CollectedHeap::put_free_region_on_list_locked(HeapRegion* r) { | |
4869 assert(ZF_mon->owned_by_self(), "precondition."); | |
4870 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
4871 assert(r->zero_fill_state() == HeapRegion::ZeroFilled, | |
4872 "Regions on free list must be zero filled"); | |
4873 assert(!r->isHumongous(), "Must not be humongous."); | |
4874 assert(r->is_empty(), "Better be empty"); | |
4875 assert(!r->is_on_free_list(), | |
4876 "Better not already be on free list"); | |
4877 assert(!r->is_on_unclean_list(), | |
4878 "Better not already be on unclean list"); | |
4879 r->set_on_free_list(true); | |
4880 r->set_next_on_free_list(_free_region_list); | |
4881 _free_region_list = r; | |
4882 _free_region_list_size++; | |
4883 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
4884 } | |
4885 | |
4886 void G1CollectedHeap::put_free_region_on_list(HeapRegion* r) { | |
4887 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4888 put_free_region_on_list_locked(r); | |
4889 } | |
4890 | |
4891 HeapRegion* G1CollectedHeap::pop_free_region_list_locked() { | |
4892 assert(ZF_mon->owned_by_self(), "precondition."); | |
4893 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
4894 HeapRegion* res = _free_region_list; | |
4895 if (res != NULL) { | |
4896 _free_region_list = res->next_from_free_list(); | |
4897 _free_region_list_size--; | |
4898 res->set_on_free_list(false); | |
4899 res->set_next_on_free_list(NULL); | |
4900 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
4901 } | |
4902 return res; | |
4903 } | |
4904 | |
4905 | |
4906 HeapRegion* G1CollectedHeap::alloc_free_region_from_lists(bool zero_filled) { | |
4907 // By self, or on behalf of self. | |
4908 assert(Heap_lock->is_locked(), "Precondition"); | |
4909 HeapRegion* res = NULL; | |
4910 bool first = true; | |
4911 while (res == NULL) { | |
4912 if (zero_filled || !first) { | |
4913 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4914 res = pop_free_region_list_locked(); | |
4915 if (res != NULL) { | |
4916 assert(!res->zero_fill_is_allocated(), | |
4917 "No allocated regions on free list."); | |
4918 res->set_zero_fill_allocated(); | |
4919 } else if (!first) { | |
4920 break; // We tried both, time to return NULL. | |
4921 } | |
4922 } | |
4923 | |
4924 if (res == NULL) { | |
4925 res = alloc_region_from_unclean_list(zero_filled); | |
4926 } | |
4927 assert(res == NULL || | |
4928 !zero_filled || | |
4929 res->zero_fill_is_allocated(), | |
4930 "We must have allocated the region we're returning"); | |
4931 first = false; | |
4932 } | |
4933 return res; | |
4934 } | |
4935 | |
4936 void G1CollectedHeap::remove_allocated_regions_from_lists() { | |
4937 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4938 { | |
4939 HeapRegion* prev = NULL; | |
4940 HeapRegion* cur = _unclean_region_list.hd(); | |
4941 while (cur != NULL) { | |
4942 HeapRegion* next = cur->next_from_unclean_list(); | |
4943 if (cur->zero_fill_is_allocated()) { | |
4944 // Remove from the list. | |
4945 if (prev == NULL) { | |
4946 (void)_unclean_region_list.pop(); | |
4947 } else { | |
4948 _unclean_region_list.delete_after(prev); | |
4949 } | |
4950 cur->set_on_unclean_list(false); | |
4951 cur->set_next_on_unclean_list(NULL); | |
4952 } else { | |
4953 prev = cur; | |
4954 } | |
4955 cur = next; | |
4956 } | |
4957 assert(_unclean_region_list.sz() == unclean_region_list_length(), | |
4958 "Inv"); | |
4959 } | |
4960 | |
4961 { | |
4962 HeapRegion* prev = NULL; | |
4963 HeapRegion* cur = _free_region_list; | |
4964 while (cur != NULL) { | |
4965 HeapRegion* next = cur->next_from_free_list(); | |
4966 if (cur->zero_fill_is_allocated()) { | |
4967 // Remove from the list. | |
4968 if (prev == NULL) { | |
4969 _free_region_list = cur->next_from_free_list(); | |
4970 } else { | |
4971 prev->set_next_on_free_list(cur->next_from_free_list()); | |
4972 } | |
4973 cur->set_on_free_list(false); | |
4974 cur->set_next_on_free_list(NULL); | |
4975 _free_region_list_size--; | |
4976 } else { | |
4977 prev = cur; | |
4978 } | |
4979 cur = next; | |
4980 } | |
4981 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
4982 } | |
4983 } | |
4984 | |
4985 bool G1CollectedHeap::verify_region_lists() { | |
4986 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4987 return verify_region_lists_locked(); | |
4988 } | |
4989 | |
4990 bool G1CollectedHeap::verify_region_lists_locked() { | |
4991 HeapRegion* unclean = _unclean_region_list.hd(); | |
4992 while (unclean != NULL) { | |
4993 guarantee(unclean->is_on_unclean_list(), "Well, it is!"); | |
4994 guarantee(!unclean->is_on_free_list(), "Well, it shouldn't be!"); | |
4995 guarantee(unclean->zero_fill_state() != HeapRegion::Allocated, | |
4996 "Everything else is possible."); | |
4997 unclean = unclean->next_from_unclean_list(); | |
4998 } | |
4999 guarantee(_unclean_region_list.sz() == unclean_region_list_length(), "Inv"); | |
5000 | |
5001 HeapRegion* free_r = _free_region_list; | |
5002 while (free_r != NULL) { | |
5003 assert(free_r->is_on_free_list(), "Well, it is!"); | |
5004 assert(!free_r->is_on_unclean_list(), "Well, it shouldn't be!"); | |
5005 switch (free_r->zero_fill_state()) { | |
5006 case HeapRegion::NotZeroFilled: | |
5007 case HeapRegion::ZeroFilling: | |
5008 guarantee(false, "Should not be on free list."); | |
5009 break; | |
5010 default: | |
5011 // Everything else is possible. | |
5012 break; | |
5013 } | |
5014 free_r = free_r->next_from_free_list(); | |
5015 } | |
5016 guarantee(_free_region_list_size == free_region_list_length(), "Inv"); | |
5017 // If we didn't do an assertion... | |
5018 return true; | |
5019 } | |
5020 | |
5021 size_t G1CollectedHeap::free_region_list_length() { | |
5022 assert(ZF_mon->owned_by_self(), "precondition."); | |
5023 size_t len = 0; | |
5024 HeapRegion* cur = _free_region_list; | |
5025 while (cur != NULL) { | |
5026 len++; | |
5027 cur = cur->next_from_free_list(); | |
5028 } | |
5029 return len; | |
5030 } | |
5031 | |
5032 size_t G1CollectedHeap::unclean_region_list_length() { | |
5033 assert(ZF_mon->owned_by_self(), "precondition."); | |
5034 return _unclean_region_list.length(); | |
5035 } | |
5036 | |
5037 size_t G1CollectedHeap::n_regions() { | |
5038 return _hrs->length(); | |
5039 } | |
5040 | |
5041 size_t G1CollectedHeap::max_regions() { | |
5042 return | |
5043 (size_t)align_size_up(g1_reserved_obj_bytes(), HeapRegion::GrainBytes) / | |
5044 HeapRegion::GrainBytes; | |
5045 } | |
5046 | |
5047 size_t G1CollectedHeap::free_regions() { | |
5048 /* Possibly-expensive assert. | |
5049 assert(_free_regions == count_free_regions(), | |
5050 "_free_regions is off."); | |
5051 */ | |
5052 return _free_regions; | |
5053 } | |
5054 | |
5055 bool G1CollectedHeap::should_zf() { | |
5056 return _free_region_list_size < (size_t) G1ConcZFMaxRegions; | |
5057 } | |
5058 | |
5059 class RegionCounter: public HeapRegionClosure { | |
5060 size_t _n; | |
5061 public: | |
5062 RegionCounter() : _n(0) {} | |
5063 bool doHeapRegion(HeapRegion* r) { | |
677 | 5064 if (r->is_empty()) { |
342 | 5065 assert(!r->isHumongous(), "H regions should not be empty."); |
5066 _n++; | |
5067 } | |
5068 return false; | |
5069 } | |
5070 int res() { return (int) _n; } | |
5071 }; | |
5072 | |
5073 size_t G1CollectedHeap::count_free_regions() { | |
5074 RegionCounter rc; | |
5075 heap_region_iterate(&rc); | |
5076 size_t n = rc.res(); | |
5077 if (_cur_alloc_region != NULL && _cur_alloc_region->is_empty()) | |
5078 n--; | |
5079 return n; | |
5080 } | |
5081 | |
5082 size_t G1CollectedHeap::count_free_regions_list() { | |
5083 size_t n = 0; | |
5084 size_t o = 0; | |
5085 ZF_mon->lock_without_safepoint_check(); | |
5086 HeapRegion* cur = _free_region_list; | |
5087 while (cur != NULL) { | |
5088 cur = cur->next_from_free_list(); | |
5089 n++; | |
5090 } | |
5091 size_t m = unclean_region_list_length(); | |
5092 ZF_mon->unlock(); | |
5093 return n + m; | |
5094 } | |
5095 | |
5096 bool G1CollectedHeap::should_set_young_locked() { | |
5097 assert(heap_lock_held_for_gc(), | |
5098 "the heap lock should already be held by or for this thread"); | |
5099 return (g1_policy()->in_young_gc_mode() && | |
5100 g1_policy()->should_add_next_region_to_young_list()); | |
5101 } | |
5102 | |
5103 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
5104 assert(heap_lock_held_for_gc(), | |
5105 "the heap lock should already be held by or for this thread"); | |
5106 _young_list->push_region(hr); | |
5107 g1_policy()->set_region_short_lived(hr); | |
5108 } | |
5109 | |
5110 class NoYoungRegionsClosure: public HeapRegionClosure { | |
5111 private: | |
5112 bool _success; | |
5113 public: | |
5114 NoYoungRegionsClosure() : _success(true) { } | |
5115 bool doHeapRegion(HeapRegion* r) { | |
5116 if (r->is_young()) { | |
5117 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
5118 r->bottom(), r->end()); | |
5119 _success = false; | |
5120 } | |
5121 return false; | |
5122 } | |
5123 bool success() { return _success; } | |
5124 }; | |
5125 | |
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diff
changeset
|
5126 bool G1CollectedHeap::check_young_list_empty(bool check_heap, bool check_sample) { |
1316cec51b4d
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johnc
parents:
1391
diff
changeset
|
5127 bool ret = _young_list->check_list_empty(check_sample); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
5128 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
5129 if (check_heap) { |
342 | 5130 NoYoungRegionsClosure closure; |
5131 heap_region_iterate(&closure); | |
5132 ret = ret && closure.success(); | |
5133 } | |
5134 | |
5135 return ret; | |
5136 } | |
5137 | |
5138 void G1CollectedHeap::empty_young_list() { | |
5139 assert(heap_lock_held_for_gc(), | |
5140 "the heap lock should already be held by or for this thread"); | |
5141 assert(g1_policy()->in_young_gc_mode(), "should be in young GC mode"); | |
5142 | |
5143 _young_list->empty_list(); | |
5144 } | |
5145 | |
5146 bool G1CollectedHeap::all_alloc_regions_no_allocs_since_save_marks() { | |
5147 bool no_allocs = true; | |
5148 for (int ap = 0; ap < GCAllocPurposeCount && no_allocs; ++ap) { | |
5149 HeapRegion* r = _gc_alloc_regions[ap]; | |
5150 no_allocs = r == NULL || r->saved_mark_at_top(); | |
5151 } | |
5152 return no_allocs; | |
5153 } | |
5154 | |
545 | 5155 void G1CollectedHeap::retire_all_alloc_regions() { |
342 | 5156 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
5157 HeapRegion* r = _gc_alloc_regions[ap]; | |
5158 if (r != NULL) { | |
5159 // Check for aliases. | |
5160 bool has_processed_alias = false; | |
5161 for (int i = 0; i < ap; ++i) { | |
5162 if (_gc_alloc_regions[i] == r) { | |
5163 has_processed_alias = true; | |
5164 break; | |
5165 } | |
5166 } | |
5167 if (!has_processed_alias) { | |
545 | 5168 retire_alloc_region(r, false /* par */); |
342 | 5169 } |
5170 } | |
5171 } | |
5172 } | |
5173 | |
5174 | |
5175 // Done at the start of full GC. | |
5176 void G1CollectedHeap::tear_down_region_lists() { | |
5177 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
5178 while (pop_unclean_region_list_locked() != NULL) ; | |
5179 assert(_unclean_region_list.hd() == NULL && _unclean_region_list.sz() == 0, | |
1489
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diff
changeset
|
5180 "Postconditions of loop."); |
342 | 5181 while (pop_free_region_list_locked() != NULL) ; |
5182 assert(_free_region_list == NULL, "Postcondition of loop."); | |
5183 if (_free_region_list_size != 0) { | |
5184 gclog_or_tty->print_cr("Size is %d.", _free_region_list_size); | |
838
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diff
changeset
|
5185 print_on(gclog_or_tty, true /* extended */); |
342 | 5186 } |
5187 assert(_free_region_list_size == 0, "Postconditions of loop."); | |
5188 } | |
5189 | |
5190 | |
5191 class RegionResetter: public HeapRegionClosure { | |
5192 G1CollectedHeap* _g1; | |
5193 int _n; | |
5194 public: | |
5195 RegionResetter() : _g1(G1CollectedHeap::heap()), _n(0) {} | |
5196 bool doHeapRegion(HeapRegion* r) { | |
5197 if (r->continuesHumongous()) return false; | |
5198 if (r->top() > r->bottom()) { | |
5199 if (r->top() < r->end()) { | |
5200 Copy::fill_to_words(r->top(), | |
5201 pointer_delta(r->end(), r->top())); | |
5202 } | |
5203 r->set_zero_fill_allocated(); | |
5204 } else { | |
5205 assert(r->is_empty(), "tautology"); | |
677 | 5206 _n++; |
5207 switch (r->zero_fill_state()) { | |
342 | 5208 case HeapRegion::NotZeroFilled: |
5209 case HeapRegion::ZeroFilling: | |
5210 _g1->put_region_on_unclean_list_locked(r); | |
5211 break; | |
5212 case HeapRegion::Allocated: | |
5213 r->set_zero_fill_complete(); | |
5214 // no break; go on to put on free list. | |
5215 case HeapRegion::ZeroFilled: | |
5216 _g1->put_free_region_on_list_locked(r); | |
5217 break; | |
5218 } | |
5219 } | |
5220 return false; | |
5221 } | |
5222 | |
5223 int getFreeRegionCount() {return _n;} | |
5224 }; | |
5225 | |
5226 // Done at the end of full GC. | |
5227 void G1CollectedHeap::rebuild_region_lists() { | |
5228 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
5229 // This needs to go at the end of the full GC. | |
5230 RegionResetter rs; | |
5231 heap_region_iterate(&rs); | |
5232 _free_regions = rs.getFreeRegionCount(); | |
5233 // Tell the ZF thread it may have work to do. | |
5234 if (should_zf()) ZF_mon->notify_all(); | |
5235 } | |
5236 | |
5237 class UsedRegionsNeedZeroFillSetter: public HeapRegionClosure { | |
5238 G1CollectedHeap* _g1; | |
5239 int _n; | |
5240 public: | |
5241 UsedRegionsNeedZeroFillSetter() : _g1(G1CollectedHeap::heap()), _n(0) {} | |
5242 bool doHeapRegion(HeapRegion* r) { | |
5243 if (r->continuesHumongous()) return false; | |
5244 if (r->top() > r->bottom()) { | |
5245 // There are assertions in "set_zero_fill_needed()" below that | |
5246 // require top() == bottom(), so this is technically illegal. | |
5247 // We'll skirt the law here, by making that true temporarily. | |
5248 DEBUG_ONLY(HeapWord* save_top = r->top(); | |
5249 r->set_top(r->bottom())); | |
5250 r->set_zero_fill_needed(); | |
5251 DEBUG_ONLY(r->set_top(save_top)); | |
5252 } | |
5253 return false; | |
5254 } | |
5255 }; | |
5256 | |
5257 // Done at the start of full GC. | |
5258 void G1CollectedHeap::set_used_regions_to_need_zero_fill() { | |
5259 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
5260 // This needs to go at the end of the full GC. | |
5261 UsedRegionsNeedZeroFillSetter rs; | |
5262 heap_region_iterate(&rs); | |
5263 } | |
5264 | |
5265 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
5266 _refine_cte_cl->set_concurrent(concurrent); | |
5267 } | |
5268 | |
5269 #ifndef PRODUCT | |
5270 | |
5271 class PrintHeapRegionClosure: public HeapRegionClosure { | |
5272 public: | |
5273 bool doHeapRegion(HeapRegion *r) { | |
5274 gclog_or_tty->print("Region: "PTR_FORMAT":", r); | |
5275 if (r != NULL) { | |
5276 if (r->is_on_free_list()) | |
5277 gclog_or_tty->print("Free "); | |
5278 if (r->is_young()) | |
5279 gclog_or_tty->print("Young "); | |
5280 if (r->isHumongous()) | |
5281 gclog_or_tty->print("Is Humongous "); | |
5282 r->print(); | |
5283 } | |
5284 return false; | |
5285 } | |
5286 }; | |
5287 | |
5288 class SortHeapRegionClosure : public HeapRegionClosure { | |
5289 size_t young_regions,free_regions, unclean_regions; | |
5290 size_t hum_regions, count; | |
5291 size_t unaccounted, cur_unclean, cur_alloc; | |
5292 size_t total_free; | |
5293 HeapRegion* cur; | |
5294 public: | |
5295 SortHeapRegionClosure(HeapRegion *_cur) : cur(_cur), young_regions(0), | |
5296 free_regions(0), unclean_regions(0), | |
5297 hum_regions(0), | |
5298 count(0), unaccounted(0), | |
5299 cur_alloc(0), total_free(0) | |
5300 {} | |
5301 bool doHeapRegion(HeapRegion *r) { | |
5302 count++; | |
5303 if (r->is_on_free_list()) free_regions++; | |
5304 else if (r->is_on_unclean_list()) unclean_regions++; | |
5305 else if (r->isHumongous()) hum_regions++; | |
5306 else if (r->is_young()) young_regions++; | |
5307 else if (r == cur) cur_alloc++; | |
5308 else unaccounted++; | |
5309 return false; | |
5310 } | |
5311 void print() { | |
5312 total_free = free_regions + unclean_regions; | |
5313 gclog_or_tty->print("%d regions\n", count); | |
5314 gclog_or_tty->print("%d free: free_list = %d unclean = %d\n", | |
5315 total_free, free_regions, unclean_regions); | |
5316 gclog_or_tty->print("%d humongous %d young\n", | |
5317 hum_regions, young_regions); | |
5318 gclog_or_tty->print("%d cur_alloc\n", cur_alloc); | |
5319 gclog_or_tty->print("UHOH unaccounted = %d\n", unaccounted); | |
5320 } | |
5321 }; | |
5322 | |
5323 void G1CollectedHeap::print_region_counts() { | |
5324 SortHeapRegionClosure sc(_cur_alloc_region); | |
5325 PrintHeapRegionClosure cl; | |
5326 heap_region_iterate(&cl); | |
5327 heap_region_iterate(&sc); | |
5328 sc.print(); | |
5329 print_region_accounting_info(); | |
5330 }; | |
5331 | |
5332 bool G1CollectedHeap::regions_accounted_for() { | |
5333 // TODO: regions accounting for young/survivor/tenured | |
5334 return true; | |
5335 } | |
5336 | |
5337 bool G1CollectedHeap::print_region_accounting_info() { | |
5338 gclog_or_tty->print_cr("Free regions: %d (count: %d count list %d) (clean: %d unclean: %d).", | |
5339 free_regions(), | |
5340 count_free_regions(), count_free_regions_list(), | |
5341 _free_region_list_size, _unclean_region_list.sz()); | |
5342 gclog_or_tty->print_cr("cur_alloc: %d.", | |
5343 (_cur_alloc_region == NULL ? 0 : 1)); | |
5344 gclog_or_tty->print_cr("H regions: %d.", _num_humongous_regions); | |
5345 | |
5346 // TODO: check regions accounting for young/survivor/tenured | |
5347 return true; | |
5348 } | |
5349 | |
5350 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
5351 HeapRegion* hr = heap_region_containing(p); | |
5352 if (hr == NULL) { | |
5353 return is_in_permanent(p); | |
5354 } else { | |
5355 return hr->is_in(p); | |
5356 } | |
5357 } | |
941 | 5358 #endif // !PRODUCT |
342 | 5359 |
5360 void G1CollectedHeap::g1_unimplemented() { | |
5361 // Unimplemented(); | |
5362 } |