Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 3972:4f93f0d00802
7059019: G1: add G1 support to the SA
Summary: Extend the SA to recognize the G1CollectedHeap and implement any code that's needed by our serviceability tools (jmap, jinfo, jstack, etc.) that depend on the SA.
Reviewed-by: never, poonam, johnc
author | tonyp |
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date | Tue, 20 Sep 2011 09:59:59 -0400 |
parents | af2ab04e0038 |
children | 663cb89032b1 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "code/icBuffer.hpp" | |
27 #include "gc_implementation/g1/bufferingOopClosure.hpp" | |
28 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
29 #include "gc_implementation/g1/concurrentG1RefineThread.hpp" | |
30 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
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31 #include "gc_implementation/g1/g1AllocRegion.inline.hpp" |
1972 | 32 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
33 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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34 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
1972 | 35 #include "gc_implementation/g1/g1MarkSweep.hpp" |
36 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
37 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
38 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
39 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
40 #include "gc_implementation/g1/vm_operations_g1.hpp" | |
41 #include "gc_implementation/shared/isGCActiveMark.hpp" | |
42 #include "memory/gcLocker.inline.hpp" | |
43 #include "memory/genOopClosures.inline.hpp" | |
44 #include "memory/generationSpec.hpp" | |
45 #include "oops/oop.inline.hpp" | |
46 #include "oops/oop.pcgc.inline.hpp" | |
47 #include "runtime/aprofiler.hpp" | |
48 #include "runtime/vmThread.hpp" | |
342 | 49 |
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50 size_t G1CollectedHeap::_humongous_object_threshold_in_words = 0; |
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51 |
342 | 52 // turn it on so that the contents of the young list (scan-only / |
53 // to-be-collected) are printed at "strategic" points before / during | |
54 // / after the collection --- this is useful for debugging | |
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55 #define YOUNG_LIST_VERBOSE 0 |
342 | 56 // CURRENT STATUS |
57 // This file is under construction. Search for "FIXME". | |
58 | |
59 // INVARIANTS/NOTES | |
60 // | |
61 // All allocation activity covered by the G1CollectedHeap interface is | |
1973 | 62 // serialized by acquiring the HeapLock. This happens in mem_allocate |
63 // and allocate_new_tlab, which are the "entry" points to the | |
64 // allocation code from the rest of the JVM. (Note that this does not | |
65 // apply to TLAB allocation, which is not part of this interface: it | |
66 // is done by clients of this interface.) | |
342 | 67 |
68 // Local to this file. | |
69 | |
70 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
71 SuspendibleThreadSet* _sts; | |
72 G1RemSet* _g1rs; | |
73 ConcurrentG1Refine* _cg1r; | |
74 bool _concurrent; | |
75 public: | |
76 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
77 G1RemSet* g1rs, | |
78 ConcurrentG1Refine* cg1r) : | |
79 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
80 {} | |
81 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
1705 | 82 bool oops_into_cset = _g1rs->concurrentRefineOneCard(card_ptr, worker_i, false); |
83 // This path is executed by the concurrent refine or mutator threads, | |
84 // concurrently, and so we do not care if card_ptr contains references | |
85 // that point into the collection set. | |
86 assert(!oops_into_cset, "should be"); | |
87 | |
342 | 88 if (_concurrent && _sts->should_yield()) { |
89 // Caller will actually yield. | |
90 return false; | |
91 } | |
92 // Otherwise, we finished successfully; return true. | |
93 return true; | |
94 } | |
95 void set_concurrent(bool b) { _concurrent = b; } | |
96 }; | |
97 | |
98 | |
99 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
100 int _calls; | |
101 G1CollectedHeap* _g1h; | |
102 CardTableModRefBS* _ctbs; | |
103 int _histo[256]; | |
104 public: | |
105 ClearLoggedCardTableEntryClosure() : | |
106 _calls(0) | |
107 { | |
108 _g1h = G1CollectedHeap::heap(); | |
109 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
110 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
111 } | |
112 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
113 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
114 _calls++; | |
115 unsigned char* ujb = (unsigned char*)card_ptr; | |
116 int ind = (int)(*ujb); | |
117 _histo[ind]++; | |
118 *card_ptr = -1; | |
119 } | |
120 return true; | |
121 } | |
122 int calls() { return _calls; } | |
123 void print_histo() { | |
124 gclog_or_tty->print_cr("Card table value histogram:"); | |
125 for (int i = 0; i < 256; i++) { | |
126 if (_histo[i] != 0) { | |
127 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
128 } | |
129 } | |
130 } | |
131 }; | |
132 | |
133 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
134 int _calls; | |
135 G1CollectedHeap* _g1h; | |
136 CardTableModRefBS* _ctbs; | |
137 public: | |
138 RedirtyLoggedCardTableEntryClosure() : | |
139 _calls(0) | |
140 { | |
141 _g1h = G1CollectedHeap::heap(); | |
142 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
143 } | |
144 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
145 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
146 _calls++; | |
147 *card_ptr = 0; | |
148 } | |
149 return true; | |
150 } | |
151 int calls() { return _calls; } | |
152 }; | |
153 | |
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154 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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155 public: |
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156 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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157 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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158 return true; |
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159 } |
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160 }; |
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161 |
342 | 162 YoungList::YoungList(G1CollectedHeap* g1h) |
163 : _g1h(g1h), _head(NULL), | |
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164 _length(0), |
342 | 165 _last_sampled_rs_lengths(0), |
545 | 166 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) |
342 | 167 { |
168 guarantee( check_list_empty(false), "just making sure..." ); | |
169 } | |
170 | |
171 void YoungList::push_region(HeapRegion *hr) { | |
172 assert(!hr->is_young(), "should not already be young"); | |
173 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
174 | |
175 hr->set_next_young_region(_head); | |
176 _head = hr; | |
177 | |
178 hr->set_young(); | |
179 double yg_surv_rate = _g1h->g1_policy()->predict_yg_surv_rate((int)_length); | |
180 ++_length; | |
181 } | |
182 | |
183 void YoungList::add_survivor_region(HeapRegion* hr) { | |
545 | 184 assert(hr->is_survivor(), "should be flagged as survivor region"); |
342 | 185 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
186 | |
187 hr->set_next_young_region(_survivor_head); | |
188 if (_survivor_head == NULL) { | |
545 | 189 _survivor_tail = hr; |
342 | 190 } |
191 _survivor_head = hr; | |
192 | |
193 ++_survivor_length; | |
194 } | |
195 | |
196 void YoungList::empty_list(HeapRegion* list) { | |
197 while (list != NULL) { | |
198 HeapRegion* next = list->get_next_young_region(); | |
199 list->set_next_young_region(NULL); | |
200 list->uninstall_surv_rate_group(); | |
201 list->set_not_young(); | |
202 list = next; | |
203 } | |
204 } | |
205 | |
206 void YoungList::empty_list() { | |
207 assert(check_list_well_formed(), "young list should be well formed"); | |
208 | |
209 empty_list(_head); | |
210 _head = NULL; | |
211 _length = 0; | |
212 | |
213 empty_list(_survivor_head); | |
214 _survivor_head = NULL; | |
545 | 215 _survivor_tail = NULL; |
342 | 216 _survivor_length = 0; |
217 | |
218 _last_sampled_rs_lengths = 0; | |
219 | |
220 assert(check_list_empty(false), "just making sure..."); | |
221 } | |
222 | |
223 bool YoungList::check_list_well_formed() { | |
224 bool ret = true; | |
225 | |
226 size_t length = 0; | |
227 HeapRegion* curr = _head; | |
228 HeapRegion* last = NULL; | |
229 while (curr != NULL) { | |
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230 if (!curr->is_young()) { |
342 | 231 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " |
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232 "incorrectly tagged (y: %d, surv: %d)", |
342 | 233 curr->bottom(), curr->end(), |
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234 curr->is_young(), curr->is_survivor()); |
342 | 235 ret = false; |
236 } | |
237 ++length; | |
238 last = curr; | |
239 curr = curr->get_next_young_region(); | |
240 } | |
241 ret = ret && (length == _length); | |
242 | |
243 if (!ret) { | |
244 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
245 gclog_or_tty->print_cr("### list has %d entries, _length is %d", | |
246 length, _length); | |
247 } | |
248 | |
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249 return ret; |
342 | 250 } |
251 | |
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252 bool YoungList::check_list_empty(bool check_sample) { |
342 | 253 bool ret = true; |
254 | |
255 if (_length != 0) { | |
256 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %d", | |
257 _length); | |
258 ret = false; | |
259 } | |
260 if (check_sample && _last_sampled_rs_lengths != 0) { | |
261 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
262 ret = false; | |
263 } | |
264 if (_head != NULL) { | |
265 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
266 ret = false; | |
267 } | |
268 if (!ret) { | |
269 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
270 } | |
271 | |
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272 return ret; |
342 | 273 } |
274 | |
275 void | |
276 YoungList::rs_length_sampling_init() { | |
277 _sampled_rs_lengths = 0; | |
278 _curr = _head; | |
279 } | |
280 | |
281 bool | |
282 YoungList::rs_length_sampling_more() { | |
283 return _curr != NULL; | |
284 } | |
285 | |
286 void | |
287 YoungList::rs_length_sampling_next() { | |
288 assert( _curr != NULL, "invariant" ); | |
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289 size_t rs_length = _curr->rem_set()->occupied(); |
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290 |
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291 _sampled_rs_lengths += rs_length; |
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292 |
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293 // The current region may not yet have been added to the |
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294 // incremental collection set (it gets added when it is |
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295 // retired as the current allocation region). |
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296 if (_curr->in_collection_set()) { |
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297 // Update the collection set policy information for this region |
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298 _g1h->g1_policy()->update_incremental_cset_info(_curr, rs_length); |
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299 } |
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300 |
342 | 301 _curr = _curr->get_next_young_region(); |
302 if (_curr == NULL) { | |
303 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
304 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
305 } | |
306 } | |
307 | |
308 void | |
309 YoungList::reset_auxilary_lists() { | |
310 guarantee( is_empty(), "young list should be empty" ); | |
311 assert(check_list_well_formed(), "young list should be well formed"); | |
312 | |
313 // Add survivor regions to SurvRateGroup. | |
314 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
545 | 315 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
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316 |
342 | 317 for (HeapRegion* curr = _survivor_head; |
318 curr != NULL; | |
319 curr = curr->get_next_young_region()) { | |
320 _g1h->g1_policy()->set_region_survivors(curr); | |
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321 |
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322 // The region is a non-empty survivor so let's add it to |
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323 // the incremental collection set for the next evacuation |
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324 // pause. |
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325 _g1h->g1_policy()->add_region_to_incremental_cset_rhs(curr); |
342 | 326 } |
327 _g1h->g1_policy()->note_stop_adding_survivor_regions(); | |
328 | |
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329 _head = _survivor_head; |
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330 _length = _survivor_length; |
342 | 331 if (_survivor_head != NULL) { |
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332 assert(_survivor_tail != NULL, "cause it shouldn't be"); |
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333 assert(_survivor_length > 0, "invariant"); |
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334 _survivor_tail->set_next_young_region(NULL); |
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335 } |
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336 |
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337 // Don't clear the survivor list handles until the start of |
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338 // the next evacuation pause - we need it in order to re-tag |
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339 // the survivor regions from this evacuation pause as 'young' |
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340 // at the start of the next. |
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341 |
545 | 342 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
342 | 343 |
344 assert(check_list_well_formed(), "young list should be well formed"); | |
345 } | |
346 | |
347 void YoungList::print() { | |
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348 HeapRegion* lists[] = {_head, _survivor_head}; |
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349 const char* names[] = {"YOUNG", "SURVIVOR"}; |
342 | 350 |
351 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
352 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
353 HeapRegion *curr = lists[list]; | |
354 if (curr == NULL) | |
355 gclog_or_tty->print_cr(" empty"); | |
356 while (curr != NULL) { | |
357 gclog_or_tty->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " | |
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358 "age: %4d, y: %d, surv: %d", |
342 | 359 curr->bottom(), curr->end(), |
360 curr->top(), | |
361 curr->prev_top_at_mark_start(), | |
362 curr->next_top_at_mark_start(), | |
363 curr->top_at_conc_mark_count(), | |
364 curr->age_in_surv_rate_group_cond(), | |
365 curr->is_young(), | |
366 curr->is_survivor()); | |
367 curr = curr->get_next_young_region(); | |
368 } | |
369 } | |
370 | |
371 gclog_or_tty->print_cr(""); | |
372 } | |
373 | |
796
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374 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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375 { |
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376 // Claim the right to put the region on the dirty cards region list |
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377 // by installing a self pointer. |
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378 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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379 if (next == NULL) { |
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380 HeapRegion* res = (HeapRegion*) |
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381 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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382 NULL); |
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383 if (res == NULL) { |
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384 HeapRegion* head; |
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385 do { |
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386 // Put the region to the dirty cards region list. |
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387 head = _dirty_cards_region_list; |
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388 next = (HeapRegion*) |
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389 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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390 if (next == head) { |
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391 assert(hr->get_next_dirty_cards_region() == hr, |
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392 "hr->get_next_dirty_cards_region() != hr"); |
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393 if (next == NULL) { |
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394 // The last region in the list points to itself. |
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395 hr->set_next_dirty_cards_region(hr); |
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396 } else { |
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397 hr->set_next_dirty_cards_region(next); |
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398 } |
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399 } |
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400 } while (next != head); |
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401 } |
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402 } |
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403 } |
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404 |
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405 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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406 { |
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407 HeapRegion* head; |
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408 HeapRegion* hr; |
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409 do { |
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410 head = _dirty_cards_region_list; |
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411 if (head == NULL) { |
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412 return NULL; |
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413 } |
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414 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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415 if (head == new_head) { |
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416 // The last region. |
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417 new_head = NULL; |
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418 } |
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419 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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420 head); |
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421 } while (hr != head); |
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422 assert(hr != NULL, "invariant"); |
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423 hr->set_next_dirty_cards_region(NULL); |
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424 return hr; |
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425 } |
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426 |
342 | 427 void G1CollectedHeap::stop_conc_gc_threads() { |
794 | 428 _cg1r->stop(); |
342 | 429 _cmThread->stop(); |
430 } | |
431 | |
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432 #ifdef ASSERT |
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433 // A region is added to the collection set as it is retired |
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434 // so an address p can point to a region which will be in the |
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435 // collection set but has not yet been retired. This method |
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436 // therefore is only accurate during a GC pause after all |
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437 // regions have been retired. It is used for debugging |
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438 // to check if an nmethod has references to objects that can |
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439 // be move during a partial collection. Though it can be |
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440 // inaccurate, it is sufficient for G1 because the conservative |
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441 // implementation of is_scavengable() for G1 will indicate that |
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442 // all nmethods must be scanned during a partial collection. |
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443 bool G1CollectedHeap::is_in_partial_collection(const void* p) { |
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444 HeapRegion* hr = heap_region_containing(p); |
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445 return hr != NULL && hr->in_collection_set(); |
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446 } |
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447 #endif |
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448 |
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449 // Returns true if the reference points to an object that |
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450 // can move in an incremental collecction. |
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451 bool G1CollectedHeap::is_scavengable(const void* p) { |
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452 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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453 G1CollectorPolicy* g1p = g1h->g1_policy(); |
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454 HeapRegion* hr = heap_region_containing(p); |
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455 if (hr == NULL) { |
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456 // perm gen (or null) |
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457 return false; |
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458 } else { |
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459 return !hr->isHumongous(); |
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460 } |
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461 } |
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462 |
342 | 463 void G1CollectedHeap::check_ct_logs_at_safepoint() { |
464 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
465 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
466 | |
467 // Count the dirty cards at the start. | |
468 CountNonCleanMemRegionClosure count1(this); | |
469 ct_bs->mod_card_iterate(&count1); | |
470 int orig_count = count1.n(); | |
471 | |
472 // First clear the logged cards. | |
473 ClearLoggedCardTableEntryClosure clear; | |
474 dcqs.set_closure(&clear); | |
475 dcqs.apply_closure_to_all_completed_buffers(); | |
476 dcqs.iterate_closure_all_threads(false); | |
477 clear.print_histo(); | |
478 | |
479 // Now ensure that there's no dirty cards. | |
480 CountNonCleanMemRegionClosure count2(this); | |
481 ct_bs->mod_card_iterate(&count2); | |
482 if (count2.n() != 0) { | |
483 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
484 count2.n(), orig_count); | |
485 } | |
486 guarantee(count2.n() == 0, "Card table should be clean."); | |
487 | |
488 RedirtyLoggedCardTableEntryClosure redirty; | |
489 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
490 dcqs.apply_closure_to_all_completed_buffers(); | |
491 dcqs.iterate_closure_all_threads(false); | |
492 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
493 clear.calls(), orig_count); | |
494 guarantee(redirty.calls() == clear.calls(), | |
495 "Or else mechanism is broken."); | |
496 | |
497 CountNonCleanMemRegionClosure count3(this); | |
498 ct_bs->mod_card_iterate(&count3); | |
499 if (count3.n() != orig_count) { | |
500 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
501 orig_count, count3.n()); | |
502 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
503 } | |
504 | |
505 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
506 } | |
507 | |
508 // Private class members. | |
509 | |
510 G1CollectedHeap* G1CollectedHeap::_g1h; | |
511 | |
512 // Private methods. | |
513 | |
2152 | 514 HeapRegion* |
2361 | 515 G1CollectedHeap::new_region_try_secondary_free_list() { |
2152 | 516 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
517 while (!_secondary_free_list.is_empty() || free_regions_coming()) { | |
518 if (!_secondary_free_list.is_empty()) { | |
519 if (G1ConcRegionFreeingVerbose) { | |
520 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
521 "secondary_free_list has "SIZE_FORMAT" entries", | |
522 _secondary_free_list.length()); | |
523 } | |
524 // It looks as if there are free regions available on the | |
525 // secondary_free_list. Let's move them to the free_list and try | |
526 // again to allocate from it. | |
527 append_secondary_free_list(); | |
528 | |
529 assert(!_free_list.is_empty(), "if the secondary_free_list was not " | |
530 "empty we should have moved at least one entry to the free_list"); | |
531 HeapRegion* res = _free_list.remove_head(); | |
532 if (G1ConcRegionFreeingVerbose) { | |
533 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
534 "allocated "HR_FORMAT" from secondary_free_list", | |
535 HR_FORMAT_PARAMS(res)); | |
536 } | |
537 return res; | |
538 } | |
539 | |
540 // Wait here until we get notifed either when (a) there are no | |
541 // more free regions coming or (b) some regions have been moved on | |
542 // the secondary_free_list. | |
543 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
544 } | |
545 | |
546 if (G1ConcRegionFreeingVerbose) { | |
547 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
548 "could not allocate from secondary_free_list"); | |
549 } | |
550 return NULL; | |
551 } | |
552 | |
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553 HeapRegion* G1CollectedHeap::new_region(size_t word_size, bool do_expand) { |
2152 | 554 assert(!isHumongous(word_size) || |
555 word_size <= (size_t) HeapRegion::GrainWords, | |
556 "the only time we use this to allocate a humongous region is " | |
557 "when we are allocating a single humongous region"); | |
558 | |
559 HeapRegion* res; | |
560 if (G1StressConcRegionFreeing) { | |
561 if (!_secondary_free_list.is_empty()) { | |
562 if (G1ConcRegionFreeingVerbose) { | |
563 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
564 "forced to look at the secondary_free_list"); | |
565 } | |
2361 | 566 res = new_region_try_secondary_free_list(); |
2152 | 567 if (res != NULL) { |
568 return res; | |
569 } | |
570 } | |
571 } | |
572 res = _free_list.remove_head_or_null(); | |
573 if (res == NULL) { | |
574 if (G1ConcRegionFreeingVerbose) { | |
575 gclog_or_tty->print_cr("G1ConcRegionFreeing [region alloc] : " | |
576 "res == NULL, trying the secondary_free_list"); | |
577 } | |
2361 | 578 res = new_region_try_secondary_free_list(); |
2152 | 579 } |
342 | 580 if (res == NULL && do_expand) { |
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581 ergo_verbose1(ErgoHeapSizing, |
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582 "attempt heap expansion", |
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583 ergo_format_reason("region allocation request failed") |
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584 ergo_format_byte("allocation request"), |
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585 word_size * HeapWordSize); |
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586 if (expand(word_size * HeapWordSize)) { |
3766 | 587 // Even though the heap was expanded, it might not have reached |
588 // the desired size. So, we cannot assume that the allocation | |
589 // will succeed. | |
590 res = _free_list.remove_head_or_null(); | |
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591 } |
342 | 592 } |
593 return res; | |
594 } | |
595 | |
3766 | 596 size_t G1CollectedHeap::humongous_obj_allocate_find_first(size_t num_regions, |
597 size_t word_size) { | |
2361 | 598 assert(isHumongous(word_size), "word_size should be humongous"); |
599 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
600 | |
3766 | 601 size_t first = G1_NULL_HRS_INDEX; |
2152 | 602 if (num_regions == 1) { |
603 // Only one region to allocate, no need to go through the slower | |
604 // path. The caller will attempt the expasion if this fails, so | |
605 // let's not try to expand here too. | |
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606 HeapRegion* hr = new_region(word_size, false /* do_expand */); |
2152 | 607 if (hr != NULL) { |
608 first = hr->hrs_index(); | |
609 } else { | |
3766 | 610 first = G1_NULL_HRS_INDEX; |
2152 | 611 } |
612 } else { | |
613 // We can't allocate humongous regions while cleanupComplete() is | |
614 // running, since some of the regions we find to be empty might not | |
615 // yet be added to the free list and it is not straightforward to | |
616 // know which list they are on so that we can remove them. Note | |
617 // that we only need to do this if we need to allocate more than | |
618 // one region to satisfy the current humongous allocation | |
619 // request. If we are only allocating one region we use the common | |
620 // region allocation code (see above). | |
621 wait_while_free_regions_coming(); | |
2361 | 622 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 623 |
624 if (free_regions() >= num_regions) { | |
3766 | 625 first = _hrs.find_contiguous(num_regions); |
626 if (first != G1_NULL_HRS_INDEX) { | |
627 for (size_t i = first; i < first + num_regions; ++i) { | |
628 HeapRegion* hr = region_at(i); | |
2152 | 629 assert(hr->is_empty(), "sanity"); |
2361 | 630 assert(is_on_master_free_list(hr), "sanity"); |
2152 | 631 hr->set_pending_removal(true); |
632 } | |
633 _free_list.remove_all_pending(num_regions); | |
634 } | |
635 } | |
636 } | |
637 return first; | |
638 } | |
639 | |
2361 | 640 HeapWord* |
3766 | 641 G1CollectedHeap::humongous_obj_allocate_initialize_regions(size_t first, |
2361 | 642 size_t num_regions, |
643 size_t word_size) { | |
3766 | 644 assert(first != G1_NULL_HRS_INDEX, "pre-condition"); |
2361 | 645 assert(isHumongous(word_size), "word_size should be humongous"); |
646 assert(num_regions * HeapRegion::GrainWords >= word_size, "pre-condition"); | |
647 | |
648 // Index of last region in the series + 1. | |
3766 | 649 size_t last = first + num_regions; |
2361 | 650 |
651 // We need to initialize the region(s) we just discovered. This is | |
652 // a bit tricky given that it can happen concurrently with | |
653 // refinement threads refining cards on these regions and | |
654 // potentially wanting to refine the BOT as they are scanning | |
655 // those cards (this can happen shortly after a cleanup; see CR | |
656 // 6991377). So we have to set up the region(s) carefully and in | |
657 // a specific order. | |
658 | |
659 // The word size sum of all the regions we will allocate. | |
660 size_t word_size_sum = num_regions * HeapRegion::GrainWords; | |
661 assert(word_size <= word_size_sum, "sanity"); | |
662 | |
663 // This will be the "starts humongous" region. | |
3766 | 664 HeapRegion* first_hr = region_at(first); |
2361 | 665 // The header of the new object will be placed at the bottom of |
666 // the first region. | |
667 HeapWord* new_obj = first_hr->bottom(); | |
668 // This will be the new end of the first region in the series that | |
669 // should also match the end of the last region in the seriers. | |
670 HeapWord* new_end = new_obj + word_size_sum; | |
671 // This will be the new top of the first region that will reflect | |
672 // this allocation. | |
673 HeapWord* new_top = new_obj + word_size; | |
674 | |
675 // First, we need to zero the header of the space that we will be | |
676 // allocating. When we update top further down, some refinement | |
677 // threads might try to scan the region. By zeroing the header we | |
678 // ensure that any thread that will try to scan the region will | |
679 // come across the zero klass word and bail out. | |
680 // | |
681 // NOTE: It would not have been correct to have used | |
682 // CollectedHeap::fill_with_object() and make the space look like | |
683 // an int array. The thread that is doing the allocation will | |
684 // later update the object header to a potentially different array | |
685 // type and, for a very short period of time, the klass and length | |
686 // fields will be inconsistent. This could cause a refinement | |
687 // thread to calculate the object size incorrectly. | |
688 Copy::fill_to_words(new_obj, oopDesc::header_size(), 0); | |
689 | |
690 // We will set up the first region as "starts humongous". This | |
691 // will also update the BOT covering all the regions to reflect | |
692 // that there is a single object that starts at the bottom of the | |
693 // first region. | |
694 first_hr->set_startsHumongous(new_top, new_end); | |
695 | |
696 // Then, if there are any, we will set up the "continues | |
697 // humongous" regions. | |
698 HeapRegion* hr = NULL; | |
3766 | 699 for (size_t i = first + 1; i < last; ++i) { |
700 hr = region_at(i); | |
2361 | 701 hr->set_continuesHumongous(first_hr); |
702 } | |
703 // If we have "continues humongous" regions (hr != NULL), then the | |
704 // end of the last one should match new_end. | |
705 assert(hr == NULL || hr->end() == new_end, "sanity"); | |
706 | |
707 // Up to this point no concurrent thread would have been able to | |
708 // do any scanning on any region in this series. All the top | |
709 // fields still point to bottom, so the intersection between | |
710 // [bottom,top] and [card_start,card_end] will be empty. Before we | |
711 // update the top fields, we'll do a storestore to make sure that | |
712 // no thread sees the update to top before the zeroing of the | |
713 // object header and the BOT initialization. | |
714 OrderAccess::storestore(); | |
715 | |
716 // Now that the BOT and the object header have been initialized, | |
717 // we can update top of the "starts humongous" region. | |
718 assert(first_hr->bottom() < new_top && new_top <= first_hr->end(), | |
719 "new_top should be in this region"); | |
720 first_hr->set_top(new_top); | |
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721 if (_hr_printer.is_active()) { |
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722 HeapWord* bottom = first_hr->bottom(); |
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723 HeapWord* end = first_hr->orig_end(); |
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724 if ((first + 1) == last) { |
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725 // the series has a single humongous region |
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726 _hr_printer.alloc(G1HRPrinter::SingleHumongous, first_hr, new_top); |
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727 } else { |
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728 // the series has more than one humongous regions |
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729 _hr_printer.alloc(G1HRPrinter::StartsHumongous, first_hr, end); |
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730 } |
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731 } |
2361 | 732 |
733 // Now, we will update the top fields of the "continues humongous" | |
734 // regions. The reason we need to do this is that, otherwise, | |
735 // these regions would look empty and this will confuse parts of | |
736 // G1. For example, the code that looks for a consecutive number | |
737 // of empty regions will consider them empty and try to | |
738 // re-allocate them. We can extend is_empty() to also include | |
739 // !continuesHumongous(), but it is easier to just update the top | |
740 // fields here. The way we set top for all regions (i.e., top == | |
741 // end for all regions but the last one, top == new_top for the | |
742 // last one) is actually used when we will free up the humongous | |
743 // region in free_humongous_region(). | |
744 hr = NULL; | |
3766 | 745 for (size_t i = first + 1; i < last; ++i) { |
746 hr = region_at(i); | |
2361 | 747 if ((i + 1) == last) { |
748 // last continues humongous region | |
749 assert(hr->bottom() < new_top && new_top <= hr->end(), | |
750 "new_top should fall on this region"); | |
751 hr->set_top(new_top); | |
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752 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, new_top); |
2361 | 753 } else { |
754 // not last one | |
755 assert(new_top > hr->end(), "new_top should be above this region"); | |
756 hr->set_top(hr->end()); | |
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757 _hr_printer.alloc(G1HRPrinter::ContinuesHumongous, hr, hr->end()); |
2361 | 758 } |
759 } | |
760 // If we have continues humongous regions (hr != NULL), then the | |
761 // end of the last one should match new_end and its top should | |
762 // match new_top. | |
763 assert(hr == NULL || | |
764 (hr->end() == new_end && hr->top() == new_top), "sanity"); | |
765 | |
766 assert(first_hr->used() == word_size * HeapWordSize, "invariant"); | |
767 _summary_bytes_used += first_hr->used(); | |
768 _humongous_set.add(first_hr); | |
769 | |
770 return new_obj; | |
771 } | |
772 | |
342 | 773 // If could fit into free regions w/o expansion, try. |
774 // Otherwise, if can expand, do so. | |
775 // Otherwise, if using ex regions might help, try with ex given back. | |
1973 | 776 HeapWord* G1CollectedHeap::humongous_obj_allocate(size_t word_size) { |
2152 | 777 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
778 | |
779 verify_region_sets_optional(); | |
342 | 780 |
781 size_t num_regions = | |
1973 | 782 round_to(word_size, HeapRegion::GrainWords) / HeapRegion::GrainWords; |
342 | 783 size_t x_size = expansion_regions(); |
3766 | 784 size_t fs = _hrs.free_suffix(); |
785 size_t first = humongous_obj_allocate_find_first(num_regions, word_size); | |
786 if (first == G1_NULL_HRS_INDEX) { | |
2152 | 787 // The only thing we can do now is attempt expansion. |
342 | 788 if (fs + x_size >= num_regions) { |
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789 // If the number of regions we're trying to allocate for this |
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790 // object is at most the number of regions in the free suffix, |
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791 // then the call to humongous_obj_allocate_find_first() above |
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792 // should have succeeded and we wouldn't be here. |
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793 // |
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794 // We should only be trying to expand when the free suffix is |
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795 // not sufficient for the object _and_ we have some expansion |
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796 // room available. |
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797 assert(num_regions > fs, "earlier allocation should have succeeded"); |
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798 |
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799 ergo_verbose1(ErgoHeapSizing, |
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800 "attempt heap expansion", |
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801 ergo_format_reason("humongous allocation request failed") |
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802 ergo_format_byte("allocation request"), |
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803 word_size * HeapWordSize); |
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804 if (expand((num_regions - fs) * HeapRegion::GrainBytes)) { |
3766 | 805 // Even though the heap was expanded, it might not have |
806 // reached the desired size. So, we cannot assume that the | |
807 // allocation will succeed. | |
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808 first = humongous_obj_allocate_find_first(num_regions, word_size); |
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809 } |
2152 | 810 } |
811 } | |
812 | |
2361 | 813 HeapWord* result = NULL; |
3766 | 814 if (first != G1_NULL_HRS_INDEX) { |
2361 | 815 result = |
816 humongous_obj_allocate_initialize_regions(first, num_regions, word_size); | |
817 assert(result != NULL, "it should always return a valid result"); | |
2152 | 818 } |
819 | |
820 verify_region_sets_optional(); | |
2361 | 821 |
822 return result; | |
342 | 823 } |
824 | |
1973 | 825 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t word_size) { |
826 assert_heap_not_locked_and_not_at_safepoint(); | |
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827 assert(!isHumongous(word_size), "we do not allow humongous TLABs"); |
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828 |
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829 unsigned int dummy_gc_count_before; |
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830 return attempt_allocation(word_size, &dummy_gc_count_before); |
342 | 831 } |
832 | |
833 HeapWord* | |
834 G1CollectedHeap::mem_allocate(size_t word_size, | |
1973 | 835 bool* gc_overhead_limit_was_exceeded) { |
836 assert_heap_not_locked_and_not_at_safepoint(); | |
342 | 837 |
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838 // Loop until the allocation is satisified, or unsatisfied after GC. |
1973 | 839 for (int try_count = 1; /* we'll return */; try_count += 1) { |
840 unsigned int gc_count_before; | |
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841 |
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842 HeapWord* result = NULL; |
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843 if (!isHumongous(word_size)) { |
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844 result = attempt_allocation(word_size, &gc_count_before); |
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845 } else { |
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846 result = attempt_allocation_humongous(word_size, &gc_count_before); |
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847 } |
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848 if (result != NULL) { |
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849 return result; |
342 | 850 } |
851 | |
852 // Create the garbage collection operation... | |
1973 | 853 VM_G1CollectForAllocation op(gc_count_before, word_size); |
342 | 854 // ...and get the VM thread to execute it. |
855 VMThread::execute(&op); | |
1973 | 856 |
857 if (op.prologue_succeeded() && op.pause_succeeded()) { | |
858 // If the operation was successful we'll return the result even | |
859 // if it is NULL. If the allocation attempt failed immediately | |
860 // after a Full GC, it's unlikely we'll be able to allocate now. | |
861 HeapWord* result = op.result(); | |
862 if (result != NULL && !isHumongous(word_size)) { | |
863 // Allocations that take place on VM operations do not do any | |
864 // card dirtying and we have to do it here. We only have to do | |
865 // this for non-humongous allocations, though. | |
866 dirty_young_block(result, word_size); | |
867 } | |
342 | 868 return result; |
1973 | 869 } else { |
870 assert(op.result() == NULL, | |
871 "the result should be NULL if the VM op did not succeed"); | |
342 | 872 } |
873 | |
874 // Give a warning if we seem to be looping forever. | |
875 if ((QueuedAllocationWarningCount > 0) && | |
876 (try_count % QueuedAllocationWarningCount == 0)) { | |
1973 | 877 warning("G1CollectedHeap::mem_allocate retries %d times", try_count); |
342 | 878 } |
879 } | |
1973 | 880 |
881 ShouldNotReachHere(); | |
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882 return NULL; |
342 | 883 } |
884 | |
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885 HeapWord* G1CollectedHeap::attempt_allocation_slow(size_t word_size, |
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886 unsigned int *gc_count_before_ret) { |
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887 // Make sure you read the note in attempt_allocation_humongous(). |
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888 |
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889 assert_heap_not_locked_and_not_at_safepoint(); |
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890 assert(!isHumongous(word_size), "attempt_allocation_slow() should not " |
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891 "be called for humongous allocation requests"); |
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892 |
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893 // We should only get here after the first-level allocation attempt |
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894 // (attempt_allocation()) failed to allocate. |
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895 |
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896 // We will loop until a) we manage to successfully perform the |
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897 // allocation or b) we successfully schedule a collection which |
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898 // fails to perform the allocation. b) is the only case when we'll |
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899 // return NULL. |
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|
900 HeapWord* result = NULL; |
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901 for (int try_count = 1; /* we'll return */; try_count += 1) { |
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|
902 bool should_try_gc; |
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|
903 unsigned int gc_count_before; |
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|
904 |
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|
905 { |
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|
906 MutexLockerEx x(Heap_lock); |
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|
907 |
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|
908 result = _mutator_alloc_region.attempt_allocation_locked(word_size, |
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909 false /* bot_updates */); |
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|
910 if (result != NULL) { |
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|
911 return result; |
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|
912 } |
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|
913 |
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914 // If we reach here, attempt_allocation_locked() above failed to |
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915 // allocate a new region. So the mutator alloc region should be NULL. |
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916 assert(_mutator_alloc_region.get() == NULL, "only way to get here"); |
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|
917 |
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918 if (GC_locker::is_active_and_needs_gc()) { |
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919 if (g1_policy()->can_expand_young_list()) { |
3914
20213c8a3c40
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920 // No need for an ergo verbose message here, |
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921 // can_expand_young_list() does this when it returns true. |
2433
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922 result = _mutator_alloc_region.attempt_allocation_force(word_size, |
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923 false /* bot_updates */); |
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924 if (result != NULL) { |
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|
925 return result; |
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|
926 } |
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|
927 } |
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|
928 should_try_gc = false; |
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|
929 } else { |
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|
930 // Read the GC count while still holding the Heap_lock. |
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931 gc_count_before = SharedHeap::heap()->total_collections(); |
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932 should_try_gc = true; |
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|
933 } |
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|
934 } |
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|
935 |
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|
936 if (should_try_gc) { |
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|
937 bool succeeded; |
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|
938 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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939 if (result != NULL) { |
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|
940 assert(succeeded, "only way to get back a non-NULL result"); |
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|
941 return result; |
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|
942 } |
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|
943 |
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|
944 if (succeeded) { |
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|
945 // If we get here we successfully scheduled a collection which |
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946 // failed to allocate. No point in trying to allocate |
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|
947 // further. We'll just return NULL. |
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|
948 MutexLockerEx x(Heap_lock); |
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|
949 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
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|
950 return NULL; |
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|
951 } |
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|
952 } else { |
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|
953 GC_locker::stall_until_clear(); |
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|
954 } |
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|
955 |
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|
956 // We can reach here if we were unsuccessul in scheduling a |
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|
957 // collection (because another thread beat us to it) or if we were |
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|
958 // stalled due to the GC locker. In either can we should retry the |
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|
959 // allocation attempt in case another thread successfully |
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|
960 // performed a collection and reclaimed enough space. We do the |
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|
961 // first attempt (without holding the Heap_lock) here and the |
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|
962 // follow-on attempt will be at the start of the next loop |
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|
963 // iteration (after taking the Heap_lock). |
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|
964 result = _mutator_alloc_region.attempt_allocation(word_size, |
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|
965 false /* bot_updates */); |
abdfc822206f
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|
966 if (result != NULL ){ |
abdfc822206f
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|
967 return result; |
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|
968 } |
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|
969 |
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|
970 // Give a warning if we seem to be looping forever. |
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|
971 if ((QueuedAllocationWarningCount > 0) && |
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|
972 (try_count % QueuedAllocationWarningCount == 0)) { |
abdfc822206f
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|
973 warning("G1CollectedHeap::attempt_allocation_slow() " |
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|
974 "retries %d times", try_count); |
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|
975 } |
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|
976 } |
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diff
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|
977 |
abdfc822206f
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diff
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|
978 ShouldNotReachHere(); |
abdfc822206f
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|
979 return NULL; |
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diff
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|
980 } |
abdfc822206f
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|
981 |
abdfc822206f
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|
982 HeapWord* G1CollectedHeap::attempt_allocation_humongous(size_t word_size, |
abdfc822206f
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|
983 unsigned int * gc_count_before_ret) { |
abdfc822206f
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diff
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|
984 // The structure of this method has a lot of similarities to |
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diff
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|
985 // attempt_allocation_slow(). The reason these two were not merged |
abdfc822206f
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diff
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|
986 // into a single one is that such a method would require several "if |
abdfc822206f
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diff
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|
987 // allocation is not humongous do this, otherwise do that" |
abdfc822206f
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diff
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|
988 // conditional paths which would obscure its flow. In fact, an early |
abdfc822206f
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parents:
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|
989 // version of this code did use a unified method which was harder to |
abdfc822206f
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diff
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|
990 // follow and, as a result, it had subtle bugs that were hard to |
abdfc822206f
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|
991 // track down. So keeping these two methods separate allows each to |
abdfc822206f
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|
992 // be more readable. It will be good to keep these two in sync as |
abdfc822206f
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|
993 // much as possible. |
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diff
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|
994 |
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|
995 assert_heap_not_locked_and_not_at_safepoint(); |
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|
996 assert(isHumongous(word_size), "attempt_allocation_humongous() " |
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|
997 "should only be called for humongous allocations"); |
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|
998 |
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|
999 // We will loop until a) we manage to successfully perform the |
abdfc822206f
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|
1000 // allocation or b) we successfully schedule a collection which |
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diff
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|
1001 // fails to perform the allocation. b) is the only case when we'll |
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diff
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|
1002 // return NULL. |
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|
1003 HeapWord* result = NULL; |
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diff
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|
1004 for (int try_count = 1; /* we'll return */; try_count += 1) { |
abdfc822206f
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|
1005 bool should_try_gc; |
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|
1006 unsigned int gc_count_before; |
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|
1007 |
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|
1008 { |
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|
1009 MutexLockerEx x(Heap_lock); |
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diff
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|
1010 |
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diff
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|
1011 // Given that humongous objects are not allocated in young |
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|
1012 // regions, we'll first try to do the allocation without doing a |
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|
1013 // collection hoping that there's enough space in the heap. |
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|
1014 result = humongous_obj_allocate(word_size); |
abdfc822206f
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|
1015 if (result != NULL) { |
abdfc822206f
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|
1016 return result; |
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|
1017 } |
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|
1018 |
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|
1019 if (GC_locker::is_active_and_needs_gc()) { |
abdfc822206f
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|
1020 should_try_gc = false; |
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|
1021 } else { |
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|
1022 // Read the GC count while still holding the Heap_lock. |
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|
1023 gc_count_before = SharedHeap::heap()->total_collections(); |
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|
1024 should_try_gc = true; |
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|
1025 } |
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|
1026 } |
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|
1027 |
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1028 if (should_try_gc) { |
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1029 // If we failed to allocate the humongous object, we should try to |
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1030 // do a collection pause (if we're allowed) in case it reclaims |
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1031 // enough space for the allocation to succeed after the pause. |
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1032 |
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1033 bool succeeded; |
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1034 result = do_collection_pause(word_size, gc_count_before, &succeeded); |
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1035 if (result != NULL) { |
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1036 assert(succeeded, "only way to get back a non-NULL result"); |
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1037 return result; |
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1038 } |
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1039 |
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1040 if (succeeded) { |
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1041 // If we get here we successfully scheduled a collection which |
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1042 // failed to allocate. No point in trying to allocate |
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1043 // further. We'll just return NULL. |
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1044 MutexLockerEx x(Heap_lock); |
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1045 *gc_count_before_ret = SharedHeap::heap()->total_collections(); |
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1046 return NULL; |
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1047 } |
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1048 } else { |
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1049 GC_locker::stall_until_clear(); |
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1050 } |
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1051 |
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1052 // We can reach here if we were unsuccessul in scheduling a |
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1053 // collection (because another thread beat us to it) or if we were |
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1054 // stalled due to the GC locker. In either can we should retry the |
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1055 // allocation attempt in case another thread successfully |
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1056 // performed a collection and reclaimed enough space. Give a |
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1057 // warning if we seem to be looping forever. |
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1058 |
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1059 if ((QueuedAllocationWarningCount > 0) && |
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1060 (try_count % QueuedAllocationWarningCount == 0)) { |
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1061 warning("G1CollectedHeap::attempt_allocation_humongous() " |
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1062 "retries %d times", try_count); |
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1063 } |
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1064 } |
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1065 |
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1066 ShouldNotReachHere(); |
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1067 return NULL; |
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1068 } |
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1069 |
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1070 HeapWord* G1CollectedHeap::attempt_allocation_at_safepoint(size_t word_size, |
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1071 bool expect_null_mutator_alloc_region) { |
2152 | 1072 assert_at_safepoint(true /* should_be_vm_thread */); |
2433
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1073 assert(_mutator_alloc_region.get() == NULL || |
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1074 !expect_null_mutator_alloc_region, |
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1075 "the current alloc region was unexpectedly found to be non-NULL"); |
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1076 |
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1077 if (!isHumongous(word_size)) { |
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1078 return _mutator_alloc_region.attempt_allocation_locked(word_size, |
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1079 false /* bot_updates */); |
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1080 } else { |
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1081 return humongous_obj_allocate(word_size); |
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1082 } |
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1083 |
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1084 ShouldNotReachHere(); |
342 | 1085 } |
1086 | |
1087 class PostMCRemSetClearClosure: public HeapRegionClosure { | |
1088 ModRefBarrierSet* _mr_bs; | |
1089 public: | |
1090 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
1091 bool doHeapRegion(HeapRegion* r) { | |
1092 r->reset_gc_time_stamp(); | |
1093 if (r->continuesHumongous()) | |
1094 return false; | |
1095 HeapRegionRemSet* hrrs = r->rem_set(); | |
1096 if (hrrs != NULL) hrrs->clear(); | |
1097 // You might think here that we could clear just the cards | |
1098 // corresponding to the used region. But no: if we leave a dirty card | |
1099 // in a region we might allocate into, then it would prevent that card | |
1100 // from being enqueued, and cause it to be missed. | |
1101 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
1102 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
1103 return false; | |
1104 } | |
1105 }; | |
1106 | |
1107 | |
1108 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
1109 ModRefBarrierSet* _mr_bs; | |
1110 public: | |
1111 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
1112 bool doHeapRegion(HeapRegion* r) { | |
1113 if (r->continuesHumongous()) return false; | |
1114 if (r->used_region().word_size() != 0) { | |
1115 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
1116 } | |
1117 return false; | |
1118 } | |
1119 }; | |
1120 | |
626
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1121 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
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1122 G1CollectedHeap* _g1h; |
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1123 UpdateRSOopClosure _cl; |
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1124 int _worker_i; |
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1125 public: |
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1126 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
1861 | 1127 _cl(g1->g1_rem_set(), worker_i), |
626
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1128 _worker_i(worker_i), |
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1129 _g1h(g1) |
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1130 { } |
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1131 |
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1132 bool doHeapRegion(HeapRegion* r) { |
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1133 if (!r->continuesHumongous()) { |
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1134 _cl.set_from(r); |
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1135 r->oop_iterate(&_cl); |
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1136 } |
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1137 return false; |
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1138 } |
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1139 }; |
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1140 |
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1141 class ParRebuildRSTask: public AbstractGangTask { |
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1142 G1CollectedHeap* _g1; |
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1143 public: |
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1144 ParRebuildRSTask(G1CollectedHeap* g1) |
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1145 : AbstractGangTask("ParRebuildRSTask"), |
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1146 _g1(g1) |
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1147 { } |
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1148 |
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1149 void work(int i) { |
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1150 RebuildRSOutOfRegionClosure rebuild_rs(_g1, i); |
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1151 _g1->heap_region_par_iterate_chunked(&rebuild_rs, i, |
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1152 HeapRegion::RebuildRSClaimValue); |
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1153 } |
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1154 }; |
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1155 |
3778
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1156 class PostCompactionPrinterClosure: public HeapRegionClosure { |
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1157 private: |
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1158 G1HRPrinter* _hr_printer; |
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1159 public: |
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1160 bool doHeapRegion(HeapRegion* hr) { |
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1161 assert(!hr->is_young(), "not expecting to find young regions"); |
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1162 // We only generate output for non-empty regions. |
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1163 if (!hr->is_empty()) { |
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1164 if (!hr->isHumongous()) { |
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1165 _hr_printer->post_compaction(hr, G1HRPrinter::Old); |
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1166 } else if (hr->startsHumongous()) { |
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1167 if (hr->capacity() == (size_t) HeapRegion::GrainBytes) { |
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1168 // single humongous region |
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1169 _hr_printer->post_compaction(hr, G1HRPrinter::SingleHumongous); |
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1170 } else { |
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1171 _hr_printer->post_compaction(hr, G1HRPrinter::StartsHumongous); |
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1172 } |
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1173 } else { |
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1174 assert(hr->continuesHumongous(), "only way to get here"); |
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1175 _hr_printer->post_compaction(hr, G1HRPrinter::ContinuesHumongous); |
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1176 } |
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1177 } |
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1178 return false; |
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1179 } |
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1180 |
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1181 PostCompactionPrinterClosure(G1HRPrinter* hr_printer) |
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1182 : _hr_printer(hr_printer) { } |
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1183 }; |
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1184 |
1973 | 1185 bool G1CollectedHeap::do_collection(bool explicit_gc, |
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1186 bool clear_all_soft_refs, |
342 | 1187 size_t word_size) { |
2152 | 1188 assert_at_safepoint(true /* should_be_vm_thread */); |
1189 | |
1359
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1190 if (GC_locker::check_active_before_gc()) { |
1973 | 1191 return false; |
1359
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1192 } |
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1193 |
2125
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1194 SvcGCMarker sgcm(SvcGCMarker::FULL); |
342 | 1195 ResourceMark rm; |
1196 | |
838
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1197 if (PrintHeapAtGC) { |
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1198 Universe::print_heap_before_gc(); |
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1199 } |
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1200 |
2152 | 1201 verify_region_sets_optional(); |
342 | 1202 |
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1203 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
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1204 collector_policy()->should_clear_all_soft_refs(); |
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1205 |
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1206 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
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1207 |
342 | 1208 { |
1209 IsGCActiveMark x; | |
1210 | |
1211 // Timing | |
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1212 bool system_gc = (gc_cause() == GCCause::_java_lang_system_gc); |
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1213 assert(!system_gc || explicit_gc, "invariant"); |
342 | 1214 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
1215 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
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1216 TraceTime t(system_gc ? "Full GC (System.gc())" : "Full GC", |
1387
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1217 PrintGC, true, gclog_or_tty); |
342 | 1218 |
3289
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1219 TraceCollectorStats tcs(g1mm()->full_collection_counters()); |
3356
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1220 TraceMemoryManagerStats tms(true /* fullGC */, gc_cause()); |
1089
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1221 |
342 | 1222 double start = os::elapsedTime(); |
1223 g1_policy()->record_full_collection_start(); | |
1224 | |
2152 | 1225 wait_while_free_regions_coming(); |
2361 | 1226 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 1227 |
342 | 1228 gc_prologue(true); |
838
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1229 increment_total_collections(true /* full gc */); |
342 | 1230 |
1231 size_t g1h_prev_used = used(); | |
1232 assert(used() == recalculate_used(), "Should be equal"); | |
1233 | |
1234 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
1235 HandleMark hm; // Discard invalid handles created during verification | |
2433
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1236 gclog_or_tty->print(" VerifyBeforeGC:"); |
342 | 1237 prepare_for_verify(); |
3772
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1238 Universe::verify(/* allow dirty */ true, |
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1239 /* silent */ false, |
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1240 /* option */ VerifyOption_G1UsePrevMarking); |
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|
1241 |
342 | 1242 } |
3869
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|
1243 pre_full_gc_dump(); |
342 | 1244 |
1245 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
1246 | |
1247 // We want to discover references, but not process them yet. | |
1248 // This mode is disabled in | |
1249 // instanceRefKlass::process_discovered_references if the | |
1250 // generation does some collection work, or | |
1251 // instanceRefKlass::enqueue_discovered_references if the | |
1252 // generation returns without doing any work. | |
1253 ref_processor()->disable_discovery(); | |
1254 ref_processor()->abandon_partial_discovery(); | |
1255 ref_processor()->verify_no_references_recorded(); | |
1256 | |
1257 // Abandon current iterations of concurrent marking and concurrent | |
1258 // refinement, if any are in progress. | |
1259 concurrent_mark()->abort(); | |
1260 | |
1261 // Make sure we'll choose a new allocation region afterwards. | |
2433
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|
1262 release_mutator_alloc_region(); |
636 | 1263 abandon_gc_alloc_regions(); |
1861 | 1264 g1_rem_set()->cleanupHRRS(); |
342 | 1265 tear_down_region_lists(); |
1394
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1266 |
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|
1267 // We should call this after we retire any currently active alloc |
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|
1268 // regions so that all the ALLOC / RETIRE events are generated |
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1269 // before the start GC event. |
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|
1270 _hr_printer.start_gc(true /* full */, (size_t) total_collections()); |
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|
1271 |
1394
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|
1272 // We may have added regions to the current incremental collection |
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1273 // set between the last GC or pause and now. We need to clear the |
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|
1274 // incremental collection set and then start rebuilding it afresh |
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|
1275 // after this full GC. |
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|
1276 abandon_collection_set(g1_policy()->inc_cset_head()); |
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|
1277 g1_policy()->clear_incremental_cset(); |
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|
1278 g1_policy()->stop_incremental_cset_building(); |
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|
1279 |
3867
ff53346271fe
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diff
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|
1280 empty_young_list(); |
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|
1281 g1_policy()->set_full_young_gcs(true); |
342 | 1282 |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
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diff
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|
1283 // See the comment in G1CollectedHeap::ref_processing_init() about |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
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diff
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|
1284 // how reference processing currently works in G1. |
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diff
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|
1285 |
342 | 1286 // Temporarily make reference _discovery_ single threaded (non-MT). |
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
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2361
diff
changeset
|
1287 ReferenceProcessorMTDiscoveryMutator rp_disc_ser(ref_processor(), false); |
342 | 1288 |
1289 // Temporarily make refs discovery atomic | |
1290 ReferenceProcessorAtomicMutator rp_disc_atomic(ref_processor(), true); | |
1291 | |
1292 // Temporarily clear _is_alive_non_header | |
1293 ReferenceProcessorIsAliveMutator rp_is_alive_null(ref_processor(), NULL); | |
1294 | |
1295 ref_processor()->enable_discovery(); | |
1387
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|
1296 ref_processor()->setup_policy(do_clear_all_soft_refs); |
342 | 1297 // Do collection work |
1298 { | |
1299 HandleMark hm; // Discard invalid handles created during gc | |
1387
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|
1300 G1MarkSweep::invoke_at_safepoint(ref_processor(), do_clear_all_soft_refs); |
342 | 1301 } |
2152 | 1302 assert(free_regions() == 0, "we should not have added any free regions"); |
342 | 1303 rebuild_region_lists(); |
1304 | |
1305 _summary_bytes_used = recalculate_used(); | |
1306 | |
1307 ref_processor()->enqueue_discovered_references(); | |
1308 | |
1309 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
1310 | |
1089
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|
1311 MemoryService::track_memory_usage(); |
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|
1312 |
342 | 1313 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
1314 HandleMark hm; // Discard invalid handles created during verification | |
1315 gclog_or_tty->print(" VerifyAfterGC:"); | |
637
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
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parents:
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diff
changeset
|
1316 prepare_for_verify(); |
3772
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|
1317 Universe::verify(/* allow dirty */ false, |
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|
1318 /* silent */ false, |
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|
1319 /* option */ VerifyOption_G1UsePrevMarking); |
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|
1320 |
342 | 1321 } |
1322 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); | |
1323 | |
1324 reset_gc_time_stamp(); | |
1325 // Since everything potentially moved, we will clear all remembered | |
626
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|
1326 // sets, and clear all cards. Later we will rebuild remebered |
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diff
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|
1327 // sets. We will also reset the GC time stamps of the regions. |
342 | 1328 PostMCRemSetClearClosure rs_clear(mr_bs()); |
1329 heap_region_iterate(&rs_clear); | |
1330 | |
1331 // Resize the heap if necessary. | |
1656
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|
1332 resize_if_necessary_after_full_collection(explicit_gc ? 0 : word_size); |
342 | 1333 |
3778
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|
1334 if (_hr_printer.is_active()) { |
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|
1335 // We should do this after we potentially resize the heap so |
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|
1336 // that all the COMMIT / UNCOMMIT events are generated before |
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|
1337 // the end GC event. |
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|
1338 |
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|
1339 PostCompactionPrinterClosure cl(hr_printer()); |
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|
1340 heap_region_iterate(&cl); |
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|
1341 |
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|
1342 _hr_printer.end_gc(true /* full */, (size_t) total_collections()); |
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|
1343 } |
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|
1344 |
342 | 1345 if (_cg1r->use_cache()) { |
1346 _cg1r->clear_and_record_card_counts(); | |
1347 _cg1r->clear_hot_cache(); | |
1348 } | |
1349 | |
626
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|
1350 // Rebuild remembered sets of all regions. |
1833
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6984287: Regularize how GC parallel workers are specified.
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|
1351 |
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|
1352 if (G1CollectedHeap::use_parallel_gc_threads()) { |
626
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|
1353 ParRebuildRSTask rebuild_rs_task(this); |
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|
1354 assert(check_heap_region_claim_values( |
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|
1355 HeapRegion::InitialClaimValue), "sanity check"); |
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|
1356 set_par_threads(workers()->total_workers()); |
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|
1357 workers()->run_task(&rebuild_rs_task); |
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|
1358 set_par_threads(0); |
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changeset
|
1359 assert(check_heap_region_claim_values( |
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|
1360 HeapRegion::RebuildRSClaimValue), "sanity check"); |
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diff
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|
1361 reset_heap_region_claim_values(); |
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diff
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|
1362 } else { |
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|
1363 RebuildRSOutOfRegionClosure rebuild_rs(this); |
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|
1364 heap_region_iterate(&rebuild_rs); |
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|
1365 } |
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|
1366 |
342 | 1367 if (PrintGC) { |
1368 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); | |
1369 } | |
1370 | |
1371 if (true) { // FIXME | |
1372 // Ask the permanent generation to adjust size for full collections | |
1373 perm()->compute_new_size(); | |
1374 } | |
1375 | |
1394
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|
1376 // Start a new incremental collection set for the next pause |
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|
1377 assert(g1_policy()->collection_set() == NULL, "must be"); |
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|
1378 g1_policy()->start_incremental_cset_building(); |
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diff
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|
1379 |
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diff
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|
1380 // Clear the _cset_fast_test bitmap in anticipation of adding |
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|
1381 // regions to the incremental collection set for the next |
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diff
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|
1382 // evacuation pause. |
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diff
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|
1383 clear_cset_fast_test(); |
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1384 |
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1385 init_mutator_alloc_region(); |
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1386 |
342 | 1387 double end = os::elapsedTime(); |
1388 g1_policy()->record_full_collection_end(); | |
1389 | |
546
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1390 #ifdef TRACESPINNING |
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1391 ParallelTaskTerminator::print_termination_counts(); |
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1392 #endif |
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1393 |
342 | 1394 gc_epilogue(true); |
1395 | |
794 | 1396 // Discard all rset updates |
1397 JavaThread::dirty_card_queue_set().abandon_logs(); | |
616
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1398 assert(!G1DeferredRSUpdate |
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1399 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
342 | 1400 } |
1401 | |
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1402 _young_list->reset_sampled_info(); |
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1403 // At this point there should be no regions in the |
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1404 // entire heap tagged as young. |
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1405 assert( check_young_list_empty(true /* check_heap */), |
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1406 "young list should be empty at this point"); |
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1407 |
1656
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1408 // Update the number of full collections that have been completed. |
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1409 increment_full_collections_completed(false /* concurrent */); |
1656
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1410 |
3766 | 1411 _hrs.verify_optional(); |
2152 | 1412 verify_region_sets_optional(); |
1413 | |
838
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1414 if (PrintHeapAtGC) { |
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1415 Universe::print_heap_after_gc(); |
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1416 } |
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1417 g1mm()->update_counters(); |
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1418 post_full_gc_dump(); |
1973 | 1419 |
1420 return true; | |
342 | 1421 } |
1422 | |
1423 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
1973 | 1424 // do_collection() will return whether it succeeded in performing |
1425 // the GC. Currently, there is no facility on the | |
1426 // do_full_collection() API to notify the caller than the collection | |
1427 // did not succeed (e.g., because it was locked out by the GC | |
1428 // locker). So, right now, we'll ignore the return value. | |
1429 bool dummy = do_collection(true, /* explicit_gc */ | |
1430 clear_all_soft_refs, | |
1431 0 /* word_size */); | |
342 | 1432 } |
1433 | |
1434 // This code is mostly copied from TenuredGeneration. | |
1435 void | |
1436 G1CollectedHeap:: | |
1437 resize_if_necessary_after_full_collection(size_t word_size) { | |
1438 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
1439 | |
1440 // Include the current allocation, if any, and bytes that will be | |
1441 // pre-allocated to support collections, as "used". | |
1442 const size_t used_after_gc = used(); | |
1443 const size_t capacity_after_gc = capacity(); | |
1444 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
1445 | |
1717
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1446 // This is enforced in arguments.cpp. |
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1447 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, |
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1448 "otherwise the code below doesn't make sense"); |
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1449 |
342 | 1450 // We don't have floating point command-line arguments |
1717
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1451 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100.0; |
342 | 1452 const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
1717
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1453 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100.0; |
342 | 1454 const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
1455 | |
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1456 const size_t min_heap_size = collector_policy()->min_heap_byte_size(); |
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1457 const size_t max_heap_size = collector_policy()->max_heap_byte_size(); |
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1458 |
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1459 // We have to be careful here as these two calculations can overflow |
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1460 // 32-bit size_t's. |
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1461 double used_after_gc_d = (double) used_after_gc; |
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1462 double minimum_desired_capacity_d = used_after_gc_d / maximum_used_percentage; |
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1463 double maximum_desired_capacity_d = used_after_gc_d / minimum_used_percentage; |
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1464 |
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1465 // Let's make sure that they are both under the max heap size, which |
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1466 // by default will make them fit into a size_t. |
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1467 double desired_capacity_upper_bound = (double) max_heap_size; |
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1468 minimum_desired_capacity_d = MIN2(minimum_desired_capacity_d, |
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1469 desired_capacity_upper_bound); |
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1470 maximum_desired_capacity_d = MIN2(maximum_desired_capacity_d, |
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1471 desired_capacity_upper_bound); |
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1472 |
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1473 // We can now safely turn them into size_t's. |
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1474 size_t minimum_desired_capacity = (size_t) minimum_desired_capacity_d; |
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1475 size_t maximum_desired_capacity = (size_t) maximum_desired_capacity_d; |
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1476 |
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1477 // This assert only makes sense here, before we adjust them |
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1478 // with respect to the min and max heap size. |
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1479 assert(minimum_desired_capacity <= maximum_desired_capacity, |
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1480 err_msg("minimum_desired_capacity = "SIZE_FORMAT", " |
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1481 "maximum_desired_capacity = "SIZE_FORMAT, |
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1482 minimum_desired_capacity, maximum_desired_capacity)); |
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1483 |
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1484 // Should not be greater than the heap max size. No need to adjust |
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1485 // it with respect to the heap min size as it's a lower bound (i.e., |
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1486 // we'll try to make the capacity larger than it, not smaller). |
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1487 minimum_desired_capacity = MIN2(minimum_desired_capacity, max_heap_size); |
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1488 // Should not be less than the heap min size. No need to adjust it |
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1489 // with respect to the heap max size as it's an upper bound (i.e., |
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1490 // we'll try to make the capacity smaller than it, not greater). |
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1491 maximum_desired_capacity = MAX2(maximum_desired_capacity, min_heap_size); |
342 | 1492 |
1717
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1493 if (capacity_after_gc < minimum_desired_capacity) { |
342 | 1494 // Don't expand unless it's significant |
1495 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
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1496 ergo_verbose4(ErgoHeapSizing, |
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1497 "attempt heap expansion", |
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1498 ergo_format_reason("capacity lower than " |
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1499 "min desired capacity after Full GC") |
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1500 ergo_format_byte("capacity") |
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1501 ergo_format_byte("occupancy") |
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1502 ergo_format_byte_perc("min desired capacity"), |
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1503 capacity_after_gc, used_after_gc, |
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1504 minimum_desired_capacity, (double) MinHeapFreeRatio); |
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1505 expand(expand_bytes); |
342 | 1506 |
1507 // No expansion, now see if we want to shrink | |
1717
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1508 } else if (capacity_after_gc > maximum_desired_capacity) { |
342 | 1509 // Capacity too large, compute shrinking size |
1510 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
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1511 ergo_verbose4(ErgoHeapSizing, |
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1512 "attempt heap shrinking", |
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|
1513 ergo_format_reason("capacity higher than " |
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1514 "max desired capacity after Full GC") |
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|
1515 ergo_format_byte("capacity") |
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1516 ergo_format_byte("occupancy") |
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|
1517 ergo_format_byte_perc("max desired capacity"), |
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1518 capacity_after_gc, used_after_gc, |
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|
1519 maximum_desired_capacity, (double) MaxHeapFreeRatio); |
342 | 1520 shrink(shrink_bytes); |
1521 } | |
1522 } | |
1523 | |
1524 | |
1525 HeapWord* | |
1973 | 1526 G1CollectedHeap::satisfy_failed_allocation(size_t word_size, |
1527 bool* succeeded) { | |
2152 | 1528 assert_at_safepoint(true /* should_be_vm_thread */); |
1973 | 1529 |
1530 *succeeded = true; | |
1531 // Let's attempt the allocation first. | |
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1532 HeapWord* result = |
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1533 attempt_allocation_at_safepoint(word_size, |
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1534 false /* expect_null_mutator_alloc_region */); |
1973 | 1535 if (result != NULL) { |
1536 assert(*succeeded, "sanity"); | |
1537 return result; | |
1538 } | |
342 | 1539 |
1540 // In a G1 heap, we're supposed to keep allocation from failing by | |
1541 // incremental pauses. Therefore, at least for now, we'll favor | |
1542 // expansion over collection. (This might change in the future if we can | |
1543 // do something smarter than full collection to satisfy a failed alloc.) | |
1544 result = expand_and_allocate(word_size); | |
1545 if (result != NULL) { | |
1973 | 1546 assert(*succeeded, "sanity"); |
342 | 1547 return result; |
1548 } | |
1549 | |
1973 | 1550 // Expansion didn't work, we'll try to do a Full GC. |
1551 bool gc_succeeded = do_collection(false, /* explicit_gc */ | |
1552 false, /* clear_all_soft_refs */ | |
1553 word_size); | |
1554 if (!gc_succeeded) { | |
1555 *succeeded = false; | |
1556 return NULL; | |
1557 } | |
1558 | |
1559 // Retry the allocation | |
1560 result = attempt_allocation_at_safepoint(word_size, | |
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1561 true /* expect_null_mutator_alloc_region */); |
342 | 1562 if (result != NULL) { |
1973 | 1563 assert(*succeeded, "sanity"); |
342 | 1564 return result; |
1565 } | |
1566 | |
1973 | 1567 // Then, try a Full GC that will collect all soft references. |
1568 gc_succeeded = do_collection(false, /* explicit_gc */ | |
1569 true, /* clear_all_soft_refs */ | |
1570 word_size); | |
1571 if (!gc_succeeded) { | |
1572 *succeeded = false; | |
1573 return NULL; | |
1574 } | |
1575 | |
1576 // Retry the allocation once more | |
1577 result = attempt_allocation_at_safepoint(word_size, | |
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1578 true /* expect_null_mutator_alloc_region */); |
342 | 1579 if (result != NULL) { |
1973 | 1580 assert(*succeeded, "sanity"); |
342 | 1581 return result; |
1582 } | |
1583 | |
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1584 assert(!collector_policy()->should_clear_all_soft_refs(), |
1973 | 1585 "Flag should have been handled and cleared prior to this point"); |
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1586 |
342 | 1587 // What else? We might try synchronous finalization later. If the total |
1588 // space available is large enough for the allocation, then a more | |
1589 // complete compaction phase than we've tried so far might be | |
1590 // appropriate. | |
1973 | 1591 assert(*succeeded, "sanity"); |
342 | 1592 return NULL; |
1593 } | |
1594 | |
1595 // Attempting to expand the heap sufficiently | |
1596 // to support an allocation of the given "word_size". If | |
1597 // successful, perform the allocation and return the address of the | |
1598 // allocated block, or else "NULL". | |
1599 | |
1600 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
2152 | 1601 assert_at_safepoint(true /* should_be_vm_thread */); |
1602 | |
1603 verify_region_sets_optional(); | |
1973 | 1604 |
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1605 size_t expand_bytes = MAX2(word_size * HeapWordSize, MinHeapDeltaBytes); |
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1606 ergo_verbose1(ErgoHeapSizing, |
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1607 "attempt heap expansion", |
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1608 ergo_format_reason("allocation request failed") |
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1609 ergo_format_byte("allocation request"), |
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1610 word_size * HeapWordSize); |
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1611 if (expand(expand_bytes)) { |
3766 | 1612 _hrs.verify_optional(); |
2188
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1613 verify_region_sets_optional(); |
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1614 return attempt_allocation_at_safepoint(word_size, |
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1615 false /* expect_null_mutator_alloc_region */); |
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1616 } |
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1617 return NULL; |
342 | 1618 } |
1619 | |
3766 | 1620 void G1CollectedHeap::update_committed_space(HeapWord* old_end, |
1621 HeapWord* new_end) { | |
1622 assert(old_end != new_end, "don't call this otherwise"); | |
1623 assert((HeapWord*) _g1_storage.high() == new_end, "invariant"); | |
1624 | |
1625 // Update the committed mem region. | |
1626 _g1_committed.set_end(new_end); | |
1627 // Tell the card table about the update. | |
1628 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
1629 // Tell the BOT about the update. | |
1630 _bot_shared->resize(_g1_committed.word_size()); | |
1631 } | |
1632 | |
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1633 bool G1CollectedHeap::expand(size_t expand_bytes) { |
342 | 1634 size_t old_mem_size = _g1_storage.committed_size(); |
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1635 size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
342 | 1636 aligned_expand_bytes = align_size_up(aligned_expand_bytes, |
1637 HeapRegion::GrainBytes); | |
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1638 ergo_verbose2(ErgoHeapSizing, |
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1639 "expand the heap", |
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1640 ergo_format_byte("requested expansion amount") |
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1641 ergo_format_byte("attempted expansion amount"), |
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1642 expand_bytes, aligned_expand_bytes); |
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1643 |
3766 | 1644 // First commit the memory. |
1645 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
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1646 bool successful = _g1_storage.expand_by(aligned_expand_bytes); |
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1647 if (successful) { |
3766 | 1648 // Then propagate this update to the necessary data structures. |
1649 HeapWord* new_end = (HeapWord*) _g1_storage.high(); | |
1650 update_committed_space(old_end, new_end); | |
1651 | |
1652 FreeRegionList expansion_list("Local Expansion List"); | |
1653 MemRegion mr = _hrs.expand_by(old_end, new_end, &expansion_list); | |
1654 assert(mr.start() == old_end, "post-condition"); | |
1655 // mr might be a smaller region than what was requested if | |
1656 // expand_by() was unable to allocate the HeapRegion instances | |
1657 assert(mr.end() <= new_end, "post-condition"); | |
1658 | |
1659 size_t actual_expand_bytes = mr.byte_size(); | |
1660 assert(actual_expand_bytes <= aligned_expand_bytes, "post-condition"); | |
1661 assert(actual_expand_bytes == expansion_list.total_capacity_bytes(), | |
1662 "post-condition"); | |
1663 if (actual_expand_bytes < aligned_expand_bytes) { | |
1664 // We could not expand _hrs to the desired size. In this case we | |
1665 // need to shrink the committed space accordingly. | |
1666 assert(mr.end() < new_end, "invariant"); | |
1667 | |
1668 size_t diff_bytes = aligned_expand_bytes - actual_expand_bytes; | |
1669 // First uncommit the memory. | |
1670 _g1_storage.shrink_by(diff_bytes); | |
1671 // Then propagate this update to the necessary data structures. | |
1672 update_committed_space(new_end, mr.end()); | |
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1673 } |
3766 | 1674 _free_list.add_as_tail(&expansion_list); |
3778
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1675 |
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1676 if (_hr_printer.is_active()) { |
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1677 HeapWord* curr = mr.start(); |
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1678 while (curr < mr.end()) { |
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1679 HeapWord* curr_end = curr + HeapRegion::GrainWords; |
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1680 _hr_printer.commit(curr, curr_end); |
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1681 curr = curr_end; |
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1682 } |
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1683 assert(curr == mr.end(), "post-condition"); |
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1684 } |
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1685 g1_policy()->record_new_heap_size(n_regions()); |
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1686 } else { |
3914
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1687 ergo_verbose0(ErgoHeapSizing, |
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1688 "did not expand the heap", |
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1689 ergo_format_reason("heap expansion operation failed")); |
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1690 // The expansion of the virtual storage space was unsuccessful. |
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1691 // Let's see if it was because we ran out of swap. |
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1692 if (G1ExitOnExpansionFailure && |
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1693 _g1_storage.uncommitted_size() >= aligned_expand_bytes) { |
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1694 // We had head room... |
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1695 vm_exit_out_of_memory(aligned_expand_bytes, "G1 heap expansion"); |
342 | 1696 } |
1697 } | |
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1698 return successful; |
342 | 1699 } |
1700 | |
3766 | 1701 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) { |
342 | 1702 size_t old_mem_size = _g1_storage.committed_size(); |
1703 size_t aligned_shrink_bytes = | |
1704 ReservedSpace::page_align_size_down(shrink_bytes); | |
1705 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
1706 HeapRegion::GrainBytes); | |
1707 size_t num_regions_deleted = 0; | |
3766 | 1708 MemRegion mr = _hrs.shrink_by(aligned_shrink_bytes, &num_regions_deleted); |
1709 HeapWord* old_end = (HeapWord*) _g1_storage.high(); | |
1710 assert(mr.end() == old_end, "post-condition"); | |
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1711 |
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1712 ergo_verbose3(ErgoHeapSizing, |
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1713 "shrink the heap", |
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1714 ergo_format_byte("requested shrinking amount") |
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1715 ergo_format_byte("aligned shrinking amount") |
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1716 ergo_format_byte("attempted shrinking amount"), |
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1717 shrink_bytes, aligned_shrink_bytes, mr.byte_size()); |
3766 | 1718 if (mr.byte_size() > 0) { |
3778
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1719 if (_hr_printer.is_active()) { |
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1720 HeapWord* curr = mr.end(); |
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1721 while (curr > mr.start()) { |
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1722 HeapWord* curr_end = curr; |
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1723 curr -= HeapRegion::GrainWords; |
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1724 _hr_printer.uncommit(curr, curr_end); |
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1725 } |
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1726 assert(curr == mr.start(), "post-condition"); |
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1727 } |
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1728 |
342 | 1729 _g1_storage.shrink_by(mr.byte_size()); |
3766 | 1730 HeapWord* new_end = (HeapWord*) _g1_storage.high(); |
1731 assert(mr.start() == new_end, "post-condition"); | |
1732 | |
1733 _expansion_regions += num_regions_deleted; | |
1734 update_committed_space(old_end, new_end); | |
1735 HeapRegionRemSet::shrink_heap(n_regions()); | |
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1736 g1_policy()->record_new_heap_size(n_regions()); |
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1737 } else { |
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1738 ergo_verbose0(ErgoHeapSizing, |
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1739 "did not shrink the heap", |
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1740 ergo_format_reason("heap shrinking operation failed")); |
342 | 1741 } |
1742 } | |
1743 | |
1744 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
2152 | 1745 verify_region_sets_optional(); |
1746 | |
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1747 // We should only reach here at the end of a Full GC which means we |
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1748 // should not not be holding to any GC alloc regions. The method |
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1749 // below will make sure of that and do any remaining clean up. |
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1750 abandon_gc_alloc_regions(); |
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1751 |
2152 | 1752 // Instead of tearing down / rebuilding the free lists here, we |
1753 // could instead use the remove_all_pending() method on free_list to | |
1754 // remove only the ones that we need to remove. | |
342 | 1755 tear_down_region_lists(); // We will rebuild them in a moment. |
1756 shrink_helper(shrink_bytes); | |
1757 rebuild_region_lists(); | |
2152 | 1758 |
3766 | 1759 _hrs.verify_optional(); |
2152 | 1760 verify_region_sets_optional(); |
342 | 1761 } |
1762 | |
1763 // Public methods. | |
1764 | |
1765 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
1766 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
1767 #endif // _MSC_VER | |
1768 | |
1769 | |
1770 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
1771 SharedHeap(policy_), | |
1772 _g1_policy(policy_), | |
1111 | 1773 _dirty_card_queue_set(false), |
1705 | 1774 _into_cset_dirty_card_queue_set(false), |
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1775 _is_alive_closure(this), |
342 | 1776 _ref_processor(NULL), |
1777 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), | |
1778 _bot_shared(NULL), | |
1779 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
1780 _evac_failure_scan_stack(NULL) , | |
1781 _mark_in_progress(false), | |
2152 | 1782 _cg1r(NULL), _summary_bytes_used(0), |
342 | 1783 _refine_cte_cl(NULL), |
1784 _full_collection(false), | |
2152 | 1785 _free_list("Master Free List"), |
1786 _secondary_free_list("Secondary Free List"), | |
1787 _humongous_set("Master Humongous Set"), | |
1788 _free_regions_coming(false), | |
342 | 1789 _young_list(new YoungList(this)), |
1790 _gc_time_stamp(0), | |
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1791 _retained_old_gc_alloc_region(NULL), |
526 | 1792 _surviving_young_words(NULL), |
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1793 _full_collections_completed(0), |
526 | 1794 _in_cset_fast_test(NULL), |
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1795 _in_cset_fast_test_base(NULL), |
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1796 _dirty_cards_region_list(NULL) { |
342 | 1797 _g1h = this; // To catch bugs. |
1798 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
1799 vm_exit_during_initialization("Failed necessary allocation."); | |
1800 } | |
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1801 |
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1802 _humongous_object_threshold_in_words = HeapRegion::GrainWords / 2; |
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1803 |
342 | 1804 int n_queues = MAX2((int)ParallelGCThreads, 1); |
1805 _task_queues = new RefToScanQueueSet(n_queues); | |
1806 | |
1807 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
1808 assert(n_rem_sets > 0, "Invariant."); | |
1809 | |
1810 HeapRegionRemSetIterator** iter_arr = | |
1811 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
1812 for (int i = 0; i < n_queues; i++) { | |
1813 iter_arr[i] = new HeapRegionRemSetIterator(); | |
1814 } | |
1815 _rem_set_iterator = iter_arr; | |
1816 | |
1817 for (int i = 0; i < n_queues; i++) { | |
1818 RefToScanQueue* q = new RefToScanQueue(); | |
1819 q->initialize(); | |
1820 _task_queues->register_queue(i, q); | |
1821 } | |
1822 | |
1823 guarantee(_task_queues != NULL, "task_queues allocation failure."); | |
1824 } | |
1825 | |
1826 jint G1CollectedHeap::initialize() { | |
1166 | 1827 CollectedHeap::pre_initialize(); |
342 | 1828 os::enable_vtime(); |
1829 | |
1830 // Necessary to satisfy locking discipline assertions. | |
1831 | |
1832 MutexLocker x(Heap_lock); | |
1833 | |
3778
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1834 // We have to initialize the printer before committing the heap, as |
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1835 // it will be used then. |
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1836 _hr_printer.set_active(G1PrintHeapRegions); |
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1837 |
342 | 1838 // While there are no constraints in the GC code that HeapWordSize |
1839 // be any particular value, there are multiple other areas in the | |
1840 // system which believe this to be true (e.g. oop->object_size in some | |
1841 // cases incorrectly returns the size in wordSize units rather than | |
1842 // HeapWordSize). | |
1843 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
1844 | |
1845 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
1846 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
1847 | |
1848 // Ensure that the sizes are properly aligned. | |
1849 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
1850 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
1851 | |
1852 _cg1r = new ConcurrentG1Refine(); | |
1853 | |
1854 // Reserve the maximum. | |
1855 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
1856 // Includes the perm-gen. | |
642
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1857 |
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1858 // When compressed oops are enabled, the preferred heap base |
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1859 // is calculated by subtracting the requested size from the |
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1860 // 32Gb boundary and using the result as the base address for |
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1861 // heap reservation. If the requested size is not aligned to |
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1862 // HeapRegion::GrainBytes (i.e. the alignment that is passed |
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1863 // into the ReservedHeapSpace constructor) then the actual |
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1864 // base of the reserved heap may end up differing from the |
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1865 // address that was requested (i.e. the preferred heap base). |
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1866 // If this happens then we could end up using a non-optimal |
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1867 // compressed oops mode. |
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1868 |
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1869 // Since max_byte_size is aligned to the size of a heap region (checked |
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1870 // above), we also need to align the perm gen size as it might not be. |
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1871 const size_t total_reserved = max_byte_size + |
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1872 align_size_up(pgs->max_size(), HeapRegion::GrainBytes); |
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1873 Universe::check_alignment(total_reserved, HeapRegion::GrainBytes, "g1 heap and perm"); |
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1874 |
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1875 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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1876 |
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1877 ReservedHeapSpace heap_rs(total_reserved, HeapRegion::GrainBytes, |
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1878 UseLargePages, addr); |
642
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1879 |
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1880 if (UseCompressedOops) { |
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1881 if (addr != NULL && !heap_rs.is_reserved()) { |
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1882 // Failed to reserve at specified address - the requested memory |
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1883 // region is taken already, for example, by 'java' launcher. |
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1884 // Try again to reserver heap higher. |
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1885 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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1886 |
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1887 ReservedHeapSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
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1888 UseLargePages, addr); |
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1889 |
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1890 if (addr != NULL && !heap_rs0.is_reserved()) { |
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1891 // Failed to reserve at specified address again - give up. |
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1892 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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1893 assert(addr == NULL, ""); |
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1894 |
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1895 ReservedHeapSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
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1896 UseLargePages, addr); |
642
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1897 heap_rs = heap_rs1; |
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1898 } else { |
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1899 heap_rs = heap_rs0; |
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1900 } |
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1901 } |
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1902 } |
342 | 1903 |
1904 if (!heap_rs.is_reserved()) { | |
1905 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
1906 return JNI_ENOMEM; | |
1907 } | |
1908 | |
1909 // It is important to do this in a way such that concurrent readers can't | |
1910 // temporarily think somethings in the heap. (I've actually seen this | |
1911 // happen in asserts: DLD.) | |
1912 _reserved.set_word_size(0); | |
1913 _reserved.set_start((HeapWord*)heap_rs.base()); | |
1914 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
1915 | |
1916 _expansion_regions = max_byte_size/HeapRegion::GrainBytes; | |
1917 | |
1918 // Create the gen rem set (and barrier set) for the entire reserved region. | |
1919 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
1920 set_barrier_set(rem_set()->bs()); | |
1921 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
1922 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
1923 } else { | |
1924 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
1925 return JNI_ENOMEM; | |
1926 } | |
1927 | |
1928 // Also create a G1 rem set. | |
1861 | 1929 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { |
1930 _g1_rem_set = new G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
342 | 1931 } else { |
1861 | 1932 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); |
1933 return JNI_ENOMEM; | |
342 | 1934 } |
1935 | |
1936 // Carve out the G1 part of the heap. | |
1937 | |
1938 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
1939 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
1940 g1_rs.size()/HeapWordSize); | |
1941 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
1942 | |
1943 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
1944 | |
1945 _g1_storage.initialize(g1_rs, 0); | |
1946 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
3766 | 1947 _hrs.initialize((HeapWord*) _g1_reserved.start(), |
1948 (HeapWord*) _g1_reserved.end(), | |
1949 _expansion_regions); | |
342 | 1950 |
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1951 // 6843694 - ensure that the maximum region index can fit |
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1952 // in the remembered set structures. |
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1953 const size_t max_region_idx = ((size_t)1 << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
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1954 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
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1955 |
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1956 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
942
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1957 guarantee(HeapRegion::CardsPerRegion > 0, "make sure it's initialized"); |
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1958 guarantee((size_t) HeapRegion::CardsPerRegion < max_cards_per_region, |
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1959 "too many cards per region"); |
807
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1960 |
2152 | 1961 HeapRegionSet::set_unrealistically_long_length(max_regions() + 1); |
1962 | |
342 | 1963 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
1964 heap_word_size(init_byte_size)); | |
1965 | |
1966 _g1h = this; | |
1967 | |
1394
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1968 _in_cset_fast_test_length = max_regions(); |
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1969 _in_cset_fast_test_base = NEW_C_HEAP_ARRAY(bool, _in_cset_fast_test_length); |
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1970 |
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1971 // We're biasing _in_cset_fast_test to avoid subtracting the |
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1972 // beginning of the heap every time we want to index; basically |
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1973 // it's the same with what we do with the card table. |
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1974 _in_cset_fast_test = _in_cset_fast_test_base - |
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1975 ((size_t) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
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1976 |
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1977 // Clear the _cset_fast_test bitmap in anticipation of adding |
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1978 // regions to the incremental collection set for the first |
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1979 // evacuation pause. |
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1980 clear_cset_fast_test(); |
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1981 |
342 | 1982 // Create the ConcurrentMark data structure and thread. |
1983 // (Must do this late, so that "max_regions" is defined.) | |
1984 _cm = new ConcurrentMark(heap_rs, (int) max_regions()); | |
1985 _cmThread = _cm->cmThread(); | |
1986 | |
1987 // Initialize the from_card cache structure of HeapRegionRemSet. | |
1988 HeapRegionRemSet::init_heap(max_regions()); | |
1989 | |
677 | 1990 // Now expand into the initial heap size. |
2188
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1991 if (!expand(init_byte_size)) { |
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1992 vm_exit_during_initialization("Failed to allocate initial heap."); |
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1993 return JNI_ENOMEM; |
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1994 } |
342 | 1995 |
1996 // Perform any initialization actions delegated to the policy. | |
1997 g1_policy()->init(); | |
1998 | |
1999 g1_policy()->note_start_of_mark_thread(); | |
2000 | |
2001 _refine_cte_cl = | |
2002 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
2003 g1_rem_set(), | |
2004 concurrent_g1_refine()); | |
2005 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
2006 | |
2007 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
2008 SATB_Q_FL_lock, | |
1111 | 2009 G1SATBProcessCompletedThreshold, |
342 | 2010 Shared_SATB_Q_lock); |
794 | 2011 |
2012 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
2013 DirtyCardQ_FL_lock, | |
1111 | 2014 concurrent_g1_refine()->yellow_zone(), |
2015 concurrent_g1_refine()->red_zone(), | |
794 | 2016 Shared_DirtyCardQ_lock); |
2017 | |
616
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2018 if (G1DeferredRSUpdate) { |
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2019 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
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2020 DirtyCardQ_FL_lock, |
1111 | 2021 -1, // never trigger processing |
2022 -1, // no limit on length | |
616
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2023 Shared_DirtyCardQ_lock, |
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2024 &JavaThread::dirty_card_queue_set()); |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
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595
diff
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|
2025 } |
1705 | 2026 |
2027 // Initialize the card queue set used to hold cards containing | |
2028 // references into the collection set. | |
2029 _into_cset_dirty_card_queue_set.initialize(DirtyCardQ_CBL_mon, | |
2030 DirtyCardQ_FL_lock, | |
2031 -1, // never trigger processing | |
2032 -1, // no limit on length | |
2033 Shared_DirtyCardQ_lock, | |
2034 &JavaThread::dirty_card_queue_set()); | |
2035 | |
342 | 2036 // In case we're keeping closure specialization stats, initialize those |
2037 // counts and that mechanism. | |
2038 SpecializationStats::clear(); | |
2039 | |
2040 // Do later initialization work for concurrent refinement. | |
2041 _cg1r->init(); | |
2042 | |
2433
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|
2043 // Here we allocate the dummy full region that is required by the |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
2044 // G1AllocRegion class. If we don't pass an address in the reserved |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
2045 // space here, lots of asserts fire. |
3766 | 2046 |
2047 HeapRegion* dummy_region = new_heap_region(0 /* index of bottom region */, | |
2048 _g1_reserved.start()); | |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
2049 // We'll re-use the same region whether the alloc region will |
abdfc822206f
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|
2050 // require BOT updates or not and, if it doesn't, then a non-young |
abdfc822206f
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|
2051 // region will complain that it cannot support allocations without |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
2052 // BOT updates. So we'll tag the dummy region as young to avoid that. |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
2053 dummy_region->set_young(); |
abdfc822206f
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diff
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|
2054 // Make sure it's full. |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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|
2055 dummy_region->set_top(dummy_region->end()); |
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|
2056 G1AllocRegion::setup(this, dummy_region); |
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|
2057 |
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diff
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|
2058 init_mutator_alloc_region(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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diff
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|
2059 |
3289
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jmasa
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3285
diff
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|
2060 // Do create of the monitoring and management support so that |
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
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diff
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|
2061 // values in the heap have been properly initialized. |
b52782ae3880
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jmasa
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|
2062 _g1mm = new G1MonitoringSupport(this, &_g1_storage); |
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|
2063 |
342 | 2064 return JNI_OK; |
2065 } | |
2066 | |
2067 void G1CollectedHeap::ref_processing_init() { | |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
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1973
diff
changeset
|
2068 // Reference processing in G1 currently works as follows: |
fd1d227ef1b9
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diff
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|
2069 // |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
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1973
diff
changeset
|
2070 // * There is only one reference processor instance that |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
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1973
diff
changeset
|
2071 // 'spans' the entire heap. It is created by the code |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
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1973
diff
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|
2072 // below. |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
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1973
diff
changeset
|
2073 // * Reference discovery is not enabled during an incremental |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
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1973
diff
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|
2074 // pause (see 6484982). |
fd1d227ef1b9
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johnc
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1973
diff
changeset
|
2075 // * Discoverered refs are not enqueued nor are they processed |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
2076 // during an incremental pause (see 6484982). |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
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1973
diff
changeset
|
2077 // * Reference discovery is enabled at initial marking. |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
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1973
diff
changeset
|
2078 // * Reference discovery is disabled and the discovered |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
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diff
changeset
|
2079 // references processed etc during remarking. |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
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diff
changeset
|
2080 // * Reference discovery is MT (see below). |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
2081 // * Reference discovery requires a barrier (see below). |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
2082 // * Reference processing is currently not MT (see 6608385). |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
2083 // * A full GC enables (non-MT) reference discovery and |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
2084 // processes any discovered references. |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
2085 |
342 | 2086 SharedHeap::ref_processing_init(); |
2087 MemRegion mr = reserved_region(); | |
2369
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2361
diff
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|
2088 _ref_processor = |
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2361
diff
changeset
|
2089 new ReferenceProcessor(mr, // span |
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
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parents:
2361
diff
changeset
|
2090 ParallelRefProcEnabled && (ParallelGCThreads > 1), // mt processing |
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
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parents:
2361
diff
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|
2091 (int) ParallelGCThreads, // degree of mt processing |
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
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parents:
2361
diff
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|
2092 ParallelGCThreads > 1 || ConcGCThreads > 1, // mt discovery |
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
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parents:
2361
diff
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|
2093 (int) MAX2(ParallelGCThreads, ConcGCThreads), // degree of mt discovery |
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2361
diff
changeset
|
2094 false, // Reference discovery is not atomic |
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2361
diff
changeset
|
2095 &_is_alive_closure, // is alive closure for efficiency |
92da084fefc9
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
2361
diff
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|
2096 true); // Setting next fields of discovered |
92da084fefc9
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2361
diff
changeset
|
2097 // lists requires a barrier. |
342 | 2098 } |
2099 | |
2100 size_t G1CollectedHeap::capacity() const { | |
2101 return _g1_committed.byte_size(); | |
2102 } | |
2103 | |
1705 | 2104 void G1CollectedHeap::iterate_dirty_card_closure(CardTableEntryClosure* cl, |
2105 DirtyCardQueue* into_cset_dcq, | |
2106 bool concurrent, | |
342 | 2107 int worker_i) { |
889 | 2108 // Clean cards in the hot card cache |
1705 | 2109 concurrent_g1_refine()->clean_up_cache(worker_i, g1_rem_set(), into_cset_dcq); |
889 | 2110 |
342 | 2111 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
2112 int n_completed_buffers = 0; | |
1705 | 2113 while (dcqs.apply_closure_to_completed_buffer(cl, worker_i, 0, true)) { |
342 | 2114 n_completed_buffers++; |
2115 } | |
2116 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
2117 (double) n_completed_buffers); | |
2118 dcqs.clear_n_completed_buffers(); | |
2119 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
2120 } | |
2121 | |
2122 | |
2123 // Computes the sum of the storage used by the various regions. | |
2124 | |
2125 size_t G1CollectedHeap::used() const { | |
862
36b5611220a7
6863216: Clean up debugging debris inadvertently pushed with 6700789
ysr
parents:
861
diff
changeset
|
2126 assert(Heap_lock->owner() != NULL, |
36b5611220a7
6863216: Clean up debugging debris inadvertently pushed with 6700789
ysr
parents:
861
diff
changeset
|
2127 "Should be owned on this thread's behalf."); |
342 | 2128 size_t result = _summary_bytes_used; |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2129 // Read only once in case it is set to NULL concurrently |
2433
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7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
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|
2130 HeapRegion* hr = _mutator_alloc_region.get(); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
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|
2131 if (hr != NULL) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
2132 result += hr->used(); |
342 | 2133 return result; |
2134 } | |
2135 | |
846
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2136 size_t G1CollectedHeap::used_unlocked() const { |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2137 size_t result = _summary_bytes_used; |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2138 return result; |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
parents:
845
diff
changeset
|
2139 } |
42d84bbbecf4
6859911: G1: assert(Heap_lock->owner() = NULL, "Should be owned on this thread's behalf")
tonyp
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845
diff
changeset
|
2140 |
342 | 2141 class SumUsedClosure: public HeapRegionClosure { |
2142 size_t _used; | |
2143 public: | |
2144 SumUsedClosure() : _used(0) {} | |
2145 bool doHeapRegion(HeapRegion* r) { | |
2146 if (!r->continuesHumongous()) { | |
2147 _used += r->used(); | |
2148 } | |
2149 return false; | |
2150 } | |
2151 size_t result() { return _used; } | |
2152 }; | |
2153 | |
2154 size_t G1CollectedHeap::recalculate_used() const { | |
2155 SumUsedClosure blk; | |
3766 | 2156 heap_region_iterate(&blk); |
342 | 2157 return blk.result(); |
2158 } | |
2159 | |
2160 size_t G1CollectedHeap::unsafe_max_alloc() { | |
2152 | 2161 if (free_regions() > 0) return HeapRegion::GrainBytes; |
342 | 2162 // otherwise, is there space in the current allocation region? |
2163 | |
2164 // We need to store the current allocation region in a local variable | |
2165 // here. The problem is that this method doesn't take any locks and | |
2166 // there may be other threads which overwrite the current allocation | |
2167 // region field. attempt_allocation(), for example, sets it to NULL | |
2168 // and this can happen *after* the NULL check here but before the call | |
2169 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
2170 // to be a problem in the optimized build, since the two loads of the | |
2171 // current allocation region field are optimized away. | |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
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|
2172 HeapRegion* hr = _mutator_alloc_region.get(); |
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7023069: G1: Introduce symmetric locking in the slow allocation path
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|
2173 if (hr == NULL) { |
342 | 2174 return 0; |
2175 } | |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
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|
2176 return hr->free(); |
342 | 2177 } |
2178 | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
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|
2179 bool G1CollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2180 return |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2181 ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2182 (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2183 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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1611
diff
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|
2184 |
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
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2433
diff
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|
2185 #ifndef PRODUCT |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2186 void G1CollectedHeap::allocate_dummy_regions() { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2187 // Let's fill up most of the region |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
2188 size_t word_size = HeapRegion::GrainWords - 1024; |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
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2433
diff
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|
2189 // And as a result the region we'll allocate will be humongous. |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
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2433
diff
changeset
|
2190 guarantee(isHumongous(word_size), "sanity"); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
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2433
diff
changeset
|
2191 |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
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2433
diff
changeset
|
2192 for (uintx i = 0; i < G1DummyRegionsPerGC; ++i) { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
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2433
diff
changeset
|
2193 // Let's use the existing mechanism for the allocation |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
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2433
diff
changeset
|
2194 HeapWord* dummy_obj = humongous_obj_allocate(word_size); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
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2433
diff
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|
2195 if (dummy_obj != NULL) { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
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2433
diff
changeset
|
2196 MemRegion mr(dummy_obj, word_size); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
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2433
diff
changeset
|
2197 CollectedHeap::fill_with_object(mr); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
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2433
diff
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|
2198 } else { |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
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2433
diff
changeset
|
2199 // If we can't allocate once, we probably cannot allocate |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
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2433
diff
changeset
|
2200 // again. Let's get out of the loop. |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
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2433
diff
changeset
|
2201 break; |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
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2433
diff
changeset
|
2202 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
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diff
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|
2203 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
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diff
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|
2204 } |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
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2433
diff
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|
2205 #endif // !PRODUCT |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
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2433
diff
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|
2206 |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
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1995
diff
changeset
|
2207 void G1CollectedHeap::increment_full_collections_completed(bool concurrent) { |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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1611
diff
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|
2208 MonitorLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2209 |
2030
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2210 // We assume that if concurrent == true, then the caller is a |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2211 // concurrent thread that was joined the Suspendible Thread |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2212 // Set. If there's ever a cheap way to check this, we should add an |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2213 // assert here. |
fb712ff22571
7000559: G1: assertion failure !outer || (full_collections_started == _full_collections_completed + 1)
tonyp
parents:
1995
diff
changeset
|
2214 |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2215 // We have already incremented _total_full_collections at the start |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
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|
2216 // of the GC, so total_full_collections() represents how many full |
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2217 // collections have been started. |
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2218 unsigned int full_collections_started = total_full_collections(); |
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2219 |
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2220 // Given that this method is called at the end of a Full GC or of a |
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2221 // concurrent cycle, and those can be nested (i.e., a Full GC can |
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2222 // interrupt a concurrent cycle), the number of full collections |
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2223 // completed should be either one (in the case where there was no |
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2224 // nesting) or two (when a Full GC interrupted a concurrent cycle) |
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2225 // behind the number of full collections started. |
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2226 |
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2227 // This is the case for the inner caller, i.e. a Full GC. |
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|
2228 assert(concurrent || |
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2229 (full_collections_started == _full_collections_completed + 1) || |
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2230 (full_collections_started == _full_collections_completed + 2), |
2030
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2231 err_msg("for inner caller (Full GC): full_collections_started = %u " |
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2232 "is inconsistent with _full_collections_completed = %u", |
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2233 full_collections_started, _full_collections_completed)); |
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2234 |
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2235 // This is the case for the outer caller, i.e. the concurrent cycle. |
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|
2236 assert(!concurrent || |
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2237 (full_collections_started == _full_collections_completed + 1), |
2030
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2238 err_msg("for outer caller (concurrent cycle): " |
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2239 "full_collections_started = %u " |
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2240 "is inconsistent with _full_collections_completed = %u", |
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2241 full_collections_started, _full_collections_completed)); |
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2242 |
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2243 _full_collections_completed += 1; |
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2244 |
1840
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2245 // We need to clear the "in_progress" flag in the CM thread before |
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2246 // we wake up any waiters (especially when ExplicitInvokesConcurrent |
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2247 // is set) so that if a waiter requests another System.gc() it doesn't |
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2248 // incorrectly see that a marking cyle is still in progress. |
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2249 if (concurrent) { |
1840
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|
2250 _cmThread->clear_in_progress(); |
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|
2251 } |
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2252 |
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2253 // This notify_all() will ensure that a thread that called |
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2254 // System.gc() with (with ExplicitGCInvokesConcurrent set or not) |
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2255 // and it's waiting for a full GC to finish will be woken up. It is |
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2256 // waiting in VM_G1IncCollectionPause::doit_epilogue(). |
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2257 FullGCCount_lock->notify_all(); |
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|
2258 } |
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2259 |
342 | 2260 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { |
2152 | 2261 assert_at_safepoint(true /* should_be_vm_thread */); |
342 | 2262 GCCauseSetter gcs(this, cause); |
2263 switch (cause) { | |
2264 case GCCause::_heap_inspection: | |
2265 case GCCause::_heap_dump: { | |
2266 HandleMark hm; | |
2267 do_full_collection(false); // don't clear all soft refs | |
2268 break; | |
2269 } | |
2270 default: // XXX FIX ME | |
2271 ShouldNotReachHere(); // Unexpected use of this function | |
2272 } | |
2273 } | |
2274 | |
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2275 void G1CollectedHeap::collect(GCCause::Cause cause) { |
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2276 // The caller doesn't have the Heap_lock |
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2277 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); |
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2278 |
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2279 unsigned int gc_count_before; |
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2280 unsigned int full_gc_count_before; |
342 | 2281 { |
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2282 MutexLocker ml(Heap_lock); |
1973 | 2283 |
1088
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2284 // Read the GC count while holding the Heap_lock |
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2285 gc_count_before = SharedHeap::heap()->total_collections(); |
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2286 full_gc_count_before = SharedHeap::heap()->total_full_collections(); |
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|
2287 } |
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|
2288 |
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|
2289 if (should_do_concurrent_full_gc(cause)) { |
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2290 // Schedule an initial-mark evacuation pause that will start a |
1973 | 2291 // concurrent cycle. We're setting word_size to 0 which means that |
2292 // we are not requesting a post-GC allocation. | |
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|
2293 VM_G1IncCollectionPause op(gc_count_before, |
1973 | 2294 0, /* word_size */ |
2295 true, /* should_initiate_conc_mark */ | |
1656
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|
2296 g1_policy()->max_pause_time_ms(), |
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|
2297 cause); |
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|
2298 VMThread::execute(&op); |
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|
2299 } else { |
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|
2300 if (cause == GCCause::_gc_locker |
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2301 DEBUG_ONLY(|| cause == GCCause::_scavenge_alot)) { |
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|
2302 |
1973 | 2303 // Schedule a standard evacuation pause. We're setting word_size |
2304 // to 0 which means that we are not requesting a post-GC allocation. | |
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|
2305 VM_G1IncCollectionPause op(gc_count_before, |
1973 | 2306 0, /* word_size */ |
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|
2307 false, /* should_initiate_conc_mark */ |
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|
2308 g1_policy()->max_pause_time_ms(), |
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|
2309 cause); |
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|
2310 VMThread::execute(&op); |
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|
2311 } else { |
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|
2312 // Schedule a Full GC. |
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|
2313 VM_G1CollectFull op(gc_count_before, full_gc_count_before, cause); |
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2314 VMThread::execute(&op); |
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|
2315 } |
342 | 2316 } |
2317 } | |
2318 | |
2319 bool G1CollectedHeap::is_in(const void* p) const { | |
3766 | 2320 HeapRegion* hr = _hrs.addr_to_region((HeapWord*) p); |
2321 if (hr != NULL) { | |
342 | 2322 return hr->is_in(p); |
2323 } else { | |
2324 return _perm_gen->as_gen()->is_in(p); | |
2325 } | |
2326 } | |
2327 | |
2328 // Iteration functions. | |
2329 | |
2330 // Iterates an OopClosure over all ref-containing fields of objects | |
2331 // within a HeapRegion. | |
2332 | |
2333 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
2334 MemRegion _mr; | |
2335 OopClosure* _cl; | |
2336 public: | |
2337 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
2338 : _mr(mr), _cl(cl) {} | |
2339 bool doHeapRegion(HeapRegion* r) { | |
2340 if (! r->continuesHumongous()) { | |
2341 r->oop_iterate(_cl); | |
2342 } | |
2343 return false; | |
2344 } | |
2345 }; | |
2346 | |
678 | 2347 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
342 | 2348 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
3766 | 2349 heap_region_iterate(&blk); |
678 | 2350 if (do_perm) { |
2351 perm_gen()->oop_iterate(cl); | |
2352 } | |
342 | 2353 } |
2354 | |
678 | 2355 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
342 | 2356 IterateOopClosureRegionClosure blk(mr, cl); |
3766 | 2357 heap_region_iterate(&blk); |
678 | 2358 if (do_perm) { |
2359 perm_gen()->oop_iterate(cl); | |
2360 } | |
342 | 2361 } |
2362 | |
2363 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
2364 | |
2365 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
2366 ObjectClosure* _cl; | |
2367 public: | |
2368 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
2369 bool doHeapRegion(HeapRegion* r) { | |
2370 if (! r->continuesHumongous()) { | |
2371 r->object_iterate(_cl); | |
2372 } | |
2373 return false; | |
2374 } | |
2375 }; | |
2376 | |
678 | 2377 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
342 | 2378 IterateObjectClosureRegionClosure blk(cl); |
3766 | 2379 heap_region_iterate(&blk); |
678 | 2380 if (do_perm) { |
2381 perm_gen()->object_iterate(cl); | |
2382 } | |
342 | 2383 } |
2384 | |
2385 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
2386 // FIXME: is this right? | |
2387 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
2388 } | |
2389 | |
2390 // Calls a SpaceClosure on a HeapRegion. | |
2391 | |
2392 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
2393 SpaceClosure* _cl; | |
2394 public: | |
2395 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
2396 bool doHeapRegion(HeapRegion* r) { | |
2397 _cl->do_space(r); | |
2398 return false; | |
2399 } | |
2400 }; | |
2401 | |
2402 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
2403 SpaceClosureRegionClosure blk(cl); | |
3766 | 2404 heap_region_iterate(&blk); |
342 | 2405 } |
2406 | |
3766 | 2407 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) const { |
2408 _hrs.iterate(cl); | |
342 | 2409 } |
2410 | |
2411 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
3766 | 2412 HeapRegionClosure* cl) const { |
2413 _hrs.iterate_from(r, cl); | |
342 | 2414 } |
2415 | |
2416 void | |
2417 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
2418 int worker, | |
2419 jint claim_value) { | |
355 | 2420 const size_t regions = n_regions(); |
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|
2421 const size_t worker_num = (G1CollectedHeap::use_parallel_gc_threads() ? ParallelGCThreads : 1); |
355 | 2422 // try to spread out the starting points of the workers |
2423 const size_t start_index = regions / worker_num * (size_t) worker; | |
2424 | |
2425 // each worker will actually look at all regions | |
2426 for (size_t count = 0; count < regions; ++count) { | |
2427 const size_t index = (start_index + count) % regions; | |
2428 assert(0 <= index && index < regions, "sanity"); | |
2429 HeapRegion* r = region_at(index); | |
2430 // we'll ignore "continues humongous" regions (we'll process them | |
2431 // when we come across their corresponding "start humongous" | |
2432 // region) and regions already claimed | |
2433 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
2434 continue; | |
2435 } | |
2436 // OK, try to claim it | |
342 | 2437 if (r->claimHeapRegion(claim_value)) { |
355 | 2438 // success! |
2439 assert(!r->continuesHumongous(), "sanity"); | |
2440 if (r->startsHumongous()) { | |
2441 // If the region is "starts humongous" we'll iterate over its | |
2442 // "continues humongous" first; in fact we'll do them | |
2443 // first. The order is important. In on case, calling the | |
2444 // closure on the "starts humongous" region might de-allocate | |
2445 // and clear all its "continues humongous" regions and, as a | |
2446 // result, we might end up processing them twice. So, we'll do | |
2447 // them first (notice: most closures will ignore them anyway) and | |
2448 // then we'll do the "starts humongous" region. | |
2449 for (size_t ch_index = index + 1; ch_index < regions; ++ch_index) { | |
2450 HeapRegion* chr = region_at(ch_index); | |
2451 | |
2452 // if the region has already been claimed or it's not | |
2453 // "continues humongous" we're done | |
2454 if (chr->claim_value() == claim_value || | |
2455 !chr->continuesHumongous()) { | |
2456 break; | |
2457 } | |
2458 | |
2459 // Noone should have claimed it directly. We can given | |
2460 // that we claimed its "starts humongous" region. | |
2461 assert(chr->claim_value() != claim_value, "sanity"); | |
2462 assert(chr->humongous_start_region() == r, "sanity"); | |
2463 | |
2464 if (chr->claimHeapRegion(claim_value)) { | |
2465 // we should always be able to claim it; noone else should | |
2466 // be trying to claim this region | |
2467 | |
2468 bool res2 = cl->doHeapRegion(chr); | |
2469 assert(!res2, "Should not abort"); | |
2470 | |
2471 // Right now, this holds (i.e., no closure that actually | |
2472 // does something with "continues humongous" regions | |
2473 // clears them). We might have to weaken it in the future, | |
2474 // but let's leave these two asserts here for extra safety. | |
2475 assert(chr->continuesHumongous(), "should still be the case"); | |
2476 assert(chr->humongous_start_region() == r, "sanity"); | |
2477 } else { | |
2478 guarantee(false, "we should not reach here"); | |
2479 } | |
2480 } | |
2481 } | |
2482 | |
2483 assert(!r->continuesHumongous(), "sanity"); | |
2484 bool res = cl->doHeapRegion(r); | |
2485 assert(!res, "Should not abort"); | |
2486 } | |
2487 } | |
2488 } | |
2489 | |
390 | 2490 class ResetClaimValuesClosure: public HeapRegionClosure { |
2491 public: | |
2492 bool doHeapRegion(HeapRegion* r) { | |
2493 r->set_claim_value(HeapRegion::InitialClaimValue); | |
2494 return false; | |
2495 } | |
2496 }; | |
2497 | |
2498 void | |
2499 G1CollectedHeap::reset_heap_region_claim_values() { | |
2500 ResetClaimValuesClosure blk; | |
2501 heap_region_iterate(&blk); | |
2502 } | |
2503 | |
355 | 2504 #ifdef ASSERT |
2505 // This checks whether all regions in the heap have the correct claim | |
2506 // value. I also piggy-backed on this a check to ensure that the | |
2507 // humongous_start_region() information on "continues humongous" | |
2508 // regions is correct. | |
2509 | |
2510 class CheckClaimValuesClosure : public HeapRegionClosure { | |
2511 private: | |
2512 jint _claim_value; | |
2513 size_t _failures; | |
2514 HeapRegion* _sh_region; | |
2515 public: | |
2516 CheckClaimValuesClosure(jint claim_value) : | |
2517 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
2518 bool doHeapRegion(HeapRegion* r) { | |
2519 if (r->claim_value() != _claim_value) { | |
2520 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
2521 "claim value = %d, should be %d", | |
2522 r->bottom(), r->end(), r->claim_value(), | |
2523 _claim_value); | |
2524 ++_failures; | |
2525 } | |
2526 if (!r->isHumongous()) { | |
2527 _sh_region = NULL; | |
2528 } else if (r->startsHumongous()) { | |
2529 _sh_region = r; | |
2530 } else if (r->continuesHumongous()) { | |
2531 if (r->humongous_start_region() != _sh_region) { | |
2532 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
2533 "HS = "PTR_FORMAT", should be "PTR_FORMAT, | |
2534 r->bottom(), r->end(), | |
2535 r->humongous_start_region(), | |
2536 _sh_region); | |
2537 ++_failures; | |
342 | 2538 } |
2539 } | |
355 | 2540 return false; |
2541 } | |
2542 size_t failures() { | |
2543 return _failures; | |
2544 } | |
2545 }; | |
2546 | |
2547 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
2548 CheckClaimValuesClosure cl(claim_value); | |
2549 heap_region_iterate(&cl); | |
2550 return cl.failures() == 0; | |
2551 } | |
2552 #endif // ASSERT | |
342 | 2553 |
2554 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { | |
2555 HeapRegion* r = g1_policy()->collection_set(); | |
2556 while (r != NULL) { | |
2557 HeapRegion* next = r->next_in_collection_set(); | |
2558 if (cl->doHeapRegion(r)) { | |
2559 cl->incomplete(); | |
2560 return; | |
2561 } | |
2562 r = next; | |
2563 } | |
2564 } | |
2565 | |
2566 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
2567 HeapRegionClosure *cl) { | |
1656
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2568 if (r == NULL) { |
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2569 // The CSet is empty so there's nothing to do. |
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2570 return; |
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2571 } |
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2572 |
342 | 2573 assert(r->in_collection_set(), |
2574 "Start region must be a member of the collection set."); | |
2575 HeapRegion* cur = r; | |
2576 while (cur != NULL) { | |
2577 HeapRegion* next = cur->next_in_collection_set(); | |
2578 if (cl->doHeapRegion(cur) && false) { | |
2579 cl->incomplete(); | |
2580 return; | |
2581 } | |
2582 cur = next; | |
2583 } | |
2584 cur = g1_policy()->collection_set(); | |
2585 while (cur != r) { | |
2586 HeapRegion* next = cur->next_in_collection_set(); | |
2587 if (cl->doHeapRegion(cur) && false) { | |
2588 cl->incomplete(); | |
2589 return; | |
2590 } | |
2591 cur = next; | |
2592 } | |
2593 } | |
2594 | |
2595 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
3766 | 2596 return n_regions() > 0 ? region_at(0) : NULL; |
342 | 2597 } |
2598 | |
2599 | |
2600 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
2601 Space* res = heap_region_containing(addr); | |
2602 if (res == NULL) | |
2603 res = perm_gen()->space_containing(addr); | |
2604 return res; | |
2605 } | |
2606 | |
2607 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
2608 Space* sp = space_containing(addr); | |
2609 if (sp != NULL) { | |
2610 return sp->block_start(addr); | |
2611 } | |
2612 return NULL; | |
2613 } | |
2614 | |
2615 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
2616 Space* sp = space_containing(addr); | |
2617 assert(sp != NULL, "block_size of address outside of heap"); | |
2618 return sp->block_size(addr); | |
2619 } | |
2620 | |
2621 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
2622 Space* sp = space_containing(addr); | |
2623 return sp->block_is_obj(addr); | |
2624 } | |
2625 | |
2626 bool G1CollectedHeap::supports_tlab_allocation() const { | |
2627 return true; | |
2628 } | |
2629 | |
2630 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
2631 return HeapRegion::GrainBytes; | |
2632 } | |
2633 | |
2634 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
2635 // Return the remaining space in the cur alloc region, but not less than | |
2636 // the min TLAB size. | |
1313
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2637 |
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2638 // Also, this value can be at most the humongous object threshold, |
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2639 // since we can't allow tlabs to grow big enough to accomodate |
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2640 // humongous objects. |
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2641 |
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2642 HeapRegion* hr = _mutator_alloc_region.get(); |
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2643 size_t max_tlab_size = _humongous_object_threshold_in_words * wordSize; |
2433
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2644 if (hr == NULL) { |
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2645 return max_tlab_size; |
342 | 2646 } else { |
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2647 return MIN2(MAX2(hr->free(), (size_t) MinTLABSize), max_tlab_size); |
342 | 2648 } |
2649 } | |
2650 | |
2651 size_t G1CollectedHeap::max_capacity() const { | |
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2652 return _g1_reserved.byte_size(); |
342 | 2653 } |
2654 | |
2655 jlong G1CollectedHeap::millis_since_last_gc() { | |
2656 // assert(false, "NYI"); | |
2657 return 0; | |
2658 } | |
2659 | |
2660 void G1CollectedHeap::prepare_for_verify() { | |
2661 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
2662 ensure_parsability(false); | |
2663 } | |
2664 g1_rem_set()->prepare_for_verify(); | |
2665 } | |
2666 | |
2667 class VerifyLivenessOopClosure: public OopClosure { | |
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2668 G1CollectedHeap* _g1h; |
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2669 VerifyOption _vo; |
342 | 2670 public: |
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2671 VerifyLivenessOopClosure(G1CollectedHeap* g1h, VerifyOption vo): |
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2672 _g1h(g1h), _vo(vo) |
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2673 { } |
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2674 void do_oop(narrowOop *p) { do_oop_work(p); } |
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2675 void do_oop( oop *p) { do_oop_work(p); } |
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2676 |
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2677 template <class T> void do_oop_work(T *p) { |
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2678 oop obj = oopDesc::load_decode_heap_oop(p); |
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2679 guarantee(obj == NULL || !_g1h->is_obj_dead_cond(obj, _vo), |
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2680 "Dead object referenced by a not dead object"); |
342 | 2681 } |
2682 }; | |
2683 | |
2684 class VerifyObjsInRegionClosure: public ObjectClosure { | |
811 | 2685 private: |
342 | 2686 G1CollectedHeap* _g1h; |
2687 size_t _live_bytes; | |
2688 HeapRegion *_hr; | |
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2689 VerifyOption _vo; |
342 | 2690 public: |
3772
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2691 // _vo == UsePrevMarking -> use "prev" marking information, |
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2692 // _vo == UseNextMarking -> use "next" marking information, |
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2693 // _vo == UseMarkWord -> use mark word from object header. |
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2694 VerifyObjsInRegionClosure(HeapRegion *hr, VerifyOption vo) |
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2695 : _live_bytes(0), _hr(hr), _vo(vo) { |
342 | 2696 _g1h = G1CollectedHeap::heap(); |
2697 } | |
2698 void do_object(oop o) { | |
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2699 VerifyLivenessOopClosure isLive(_g1h, _vo); |
342 | 2700 assert(o != NULL, "Huh?"); |
3772
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2701 if (!_g1h->is_obj_dead_cond(o, _vo)) { |
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2702 // If the object is alive according to the mark word, |
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2703 // then verify that the marking information agrees. |
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2704 // Note we can't verify the contra-positive of the |
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2705 // above: if the object is dead (according to the mark |
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2706 // word), it may not be marked, or may have been marked |
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2707 // but has since became dead, or may have been allocated |
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7004681: G1: Extend marking verification to Full GCs
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|
2708 // since the last marking. |
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2709 if (_vo == VerifyOption_G1UseMarkWord) { |
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2710 guarantee(!_g1h->is_obj_dead(o), "mark word and concurrent mark mismatch"); |
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7004681: G1: Extend marking verification to Full GCs
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|
2711 } |
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2712 |
342 | 2713 o->oop_iterate(&isLive); |
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2714 if (!_hr->obj_allocated_since_prev_marking(o)) { |
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2715 size_t obj_size = o->size(); // Make sure we don't overflow |
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2716 _live_bytes += (obj_size * HeapWordSize); |
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2717 } |
342 | 2718 } |
2719 } | |
2720 size_t live_bytes() { return _live_bytes; } | |
2721 }; | |
2722 | |
2723 class PrintObjsInRegionClosure : public ObjectClosure { | |
2724 HeapRegion *_hr; | |
2725 G1CollectedHeap *_g1; | |
2726 public: | |
2727 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
2728 _g1 = G1CollectedHeap::heap(); | |
2729 }; | |
2730 | |
2731 void do_object(oop o) { | |
2732 if (o != NULL) { | |
2733 HeapWord *start = (HeapWord *) o; | |
2734 size_t word_sz = o->size(); | |
2735 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
2736 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
2737 (void*) o, word_sz, | |
2738 _g1->isMarkedPrev(o), | |
2739 _g1->isMarkedNext(o), | |
2740 _hr->obj_allocated_since_prev_marking(o)); | |
2741 HeapWord *end = start + word_sz; | |
2742 HeapWord *cur; | |
2743 int *val; | |
2744 for (cur = start; cur < end; cur++) { | |
2745 val = (int *) cur; | |
2746 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
2747 } | |
2748 } | |
2749 } | |
2750 }; | |
2751 | |
2752 class VerifyRegionClosure: public HeapRegionClosure { | |
811 | 2753 private: |
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2754 bool _allow_dirty; |
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|
2755 bool _par; |
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|
2756 VerifyOption _vo; |
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|
2757 bool _failures; |
811 | 2758 public: |
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2759 // _vo == UsePrevMarking -> use "prev" marking information, |
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2760 // _vo == UseNextMarking -> use "next" marking information, |
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2761 // _vo == UseMarkWord -> use mark word from object header. |
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2762 VerifyRegionClosure(bool allow_dirty, bool par, VerifyOption vo) |
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2763 : _allow_dirty(allow_dirty), |
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2764 _par(par), |
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2765 _vo(vo), |
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2766 _failures(false) {} |
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|
2767 |
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|
2768 bool failures() { |
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|
2769 return _failures; |
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|
2770 } |
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|
2771 |
342 | 2772 bool doHeapRegion(HeapRegion* r) { |
390 | 2773 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
2774 "Should be unclaimed at verify points."); | |
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2775 if (!r->continuesHumongous()) { |
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|
2776 bool failures = false; |
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|
2777 r->verify(_allow_dirty, _vo, &failures); |
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2778 if (failures) { |
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|
2779 _failures = true; |
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|
2780 } else { |
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|
2781 VerifyObjsInRegionClosure not_dead_yet_cl(r, _vo); |
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|
2782 r->object_iterate(¬_dead_yet_cl); |
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2783 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) { |
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2784 gclog_or_tty->print_cr("["PTR_FORMAT","PTR_FORMAT"] " |
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2785 "max_live_bytes "SIZE_FORMAT" " |
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2786 "< calculated "SIZE_FORMAT, |
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2787 r->bottom(), r->end(), |
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2788 r->max_live_bytes(), |
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2789 not_dead_yet_cl.live_bytes()); |
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2790 _failures = true; |
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2791 } |
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2792 } |
342 | 2793 } |
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2794 return false; // stop the region iteration if we hit a failure |
342 | 2795 } |
2796 }; | |
2797 | |
2798 class VerifyRootsClosure: public OopsInGenClosure { | |
2799 private: | |
2800 G1CollectedHeap* _g1h; | |
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2801 VerifyOption _vo; |
342 | 2802 bool _failures; |
2803 public: | |
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2804 // _vo == UsePrevMarking -> use "prev" marking information, |
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2805 // _vo == UseNextMarking -> use "next" marking information, |
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2806 // _vo == UseMarkWord -> use mark word from object header. |
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2807 VerifyRootsClosure(VerifyOption vo) : |
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2808 _g1h(G1CollectedHeap::heap()), |
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2809 _vo(vo), |
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2810 _failures(false) { } |
342 | 2811 |
2812 bool failures() { return _failures; } | |
2813 | |
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2814 template <class T> void do_oop_nv(T* p) { |
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2815 T heap_oop = oopDesc::load_heap_oop(p); |
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2816 if (!oopDesc::is_null(heap_oop)) { |
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2817 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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2818 if (_g1h->is_obj_dead_cond(obj, _vo)) { |
342 | 2819 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
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2820 "points to dead obj "PTR_FORMAT, p, (void*) obj); |
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2821 if (_vo == VerifyOption_G1UseMarkWord) { |
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2822 gclog_or_tty->print_cr(" Mark word: "PTR_FORMAT, (void*)(obj->mark())); |
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2823 } |
342 | 2824 obj->print_on(gclog_or_tty); |
2825 _failures = true; | |
2826 } | |
2827 } | |
2828 } | |
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2829 |
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2830 void do_oop(oop* p) { do_oop_nv(p); } |
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2831 void do_oop(narrowOop* p) { do_oop_nv(p); } |
342 | 2832 }; |
2833 | |
390 | 2834 // This is the task used for parallel heap verification. |
2835 | |
2836 class G1ParVerifyTask: public AbstractGangTask { | |
2837 private: | |
2838 G1CollectedHeap* _g1h; | |
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2839 bool _allow_dirty; |
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2840 VerifyOption _vo; |
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2841 bool _failures; |
390 | 2842 |
2843 public: | |
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2844 // _vo == UsePrevMarking -> use "prev" marking information, |
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2845 // _vo == UseNextMarking -> use "next" marking information, |
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2846 // _vo == UseMarkWord -> use mark word from object header. |
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2847 G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty, VerifyOption vo) : |
390 | 2848 AbstractGangTask("Parallel verify task"), |
845
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2849 _g1h(g1h), |
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2850 _allow_dirty(allow_dirty), |
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2851 _vo(vo), |
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2852 _failures(false) { } |
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2853 |
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2854 bool failures() { |
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2855 return _failures; |
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2856 } |
390 | 2857 |
2858 void work(int worker_i) { | |
637
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2859 HandleMark hm; |
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2860 VerifyRegionClosure blk(_allow_dirty, true, _vo); |
390 | 2861 _g1h->heap_region_par_iterate_chunked(&blk, worker_i, |
2862 HeapRegion::ParVerifyClaimValue); | |
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2863 if (blk.failures()) { |
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2864 _failures = true; |
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2865 } |
390 | 2866 } |
2867 }; | |
2868 | |
342 | 2869 void G1CollectedHeap::verify(bool allow_dirty, bool silent) { |
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2870 verify(allow_dirty, silent, VerifyOption_G1UsePrevMarking); |
811 | 2871 } |
2872 | |
2873 void G1CollectedHeap::verify(bool allow_dirty, | |
2874 bool silent, | |
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2875 VerifyOption vo) { |
342 | 2876 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
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2877 if (!silent) { gclog_or_tty->print("Roots (excluding permgen) "); } |
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2878 VerifyRootsClosure rootsCl(vo); |
989
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2879 CodeBlobToOopClosure blobsCl(&rootsCl, /*do_marking=*/ false); |
3772
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2880 |
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2881 // We apply the relevant closures to all the oops in the |
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2882 // system dictionary, the string table and the code cache. |
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2883 const int so = SharedHeap::SO_AllClasses | SharedHeap::SO_Strings | SharedHeap::SO_CodeCache; |
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2884 |
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|
2885 process_strong_roots(true, // activate StrongRootsScope |
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2886 true, // we set "collecting perm gen" to true, |
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2887 // so we don't reset the dirty cards in the perm gen. |
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|
2888 SharedHeap::ScanningOption(so), // roots scanning options |
342 | 2889 &rootsCl, |
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2890 &blobsCl, |
342 | 2891 &rootsCl); |
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2892 |
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2893 // If we're verifying after the marking phase of a Full GC then we can't |
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2894 // treat the perm gen as roots into the G1 heap. Some of the objects in |
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2895 // the perm gen may be dead and hence not marked. If one of these dead |
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2896 // objects is considered to be a root then we may end up with a false |
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2897 // "Root location <x> points to dead ob <y>" failure. |
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2898 if (vo != VerifyOption_G1UseMarkWord) { |
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2899 // Since we used "collecting_perm_gen" == true above, we will not have |
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|
2900 // checked the refs from perm into the G1-collected heap. We check those |
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|
2901 // references explicitly below. Whether the relevant cards are dirty |
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|
2902 // is checked further below in the rem set verification. |
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|
2903 if (!silent) { gclog_or_tty->print("Permgen roots "); } |
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|
2904 perm_gen()->oop_iterate(&rootsCl); |
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|
2905 } |
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2906 bool failures = rootsCl.failures(); |
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|
2907 |
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|
2908 if (vo != VerifyOption_G1UseMarkWord) { |
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2909 // If we're verifying during a full GC then the region sets |
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|
2910 // will have been torn down at the start of the GC. Therefore |
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|
2911 // verifying the region sets will fail. So we only verify |
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|
2912 // the region sets when not in a full GC. |
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|
2913 if (!silent) { gclog_or_tty->print("HeapRegionSets "); } |
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|
2914 verify_region_sets(); |
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|
2915 } |
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|
2916 |
2152 | 2917 if (!silent) { gclog_or_tty->print("HeapRegions "); } |
390 | 2918 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
2919 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2920 "sanity check"); | |
2921 | |
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2922 G1ParVerifyTask task(this, allow_dirty, vo); |
390 | 2923 int n_workers = workers()->total_workers(); |
2924 set_par_threads(n_workers); | |
2925 workers()->run_task(&task); | |
2926 set_par_threads(0); | |
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|
2927 if (task.failures()) { |
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|
2928 failures = true; |
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|
2929 } |
390 | 2930 |
2931 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), | |
2932 "sanity check"); | |
2933 | |
2934 reset_heap_region_claim_values(); | |
2935 | |
2936 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2937 "sanity check"); | |
2938 } else { | |
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|
2939 VerifyRegionClosure blk(allow_dirty, false, vo); |
3766 | 2940 heap_region_iterate(&blk); |
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|
2941 if (blk.failures()) { |
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|
2942 failures = true; |
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|
2943 } |
390 | 2944 } |
2152 | 2945 if (!silent) gclog_or_tty->print("RemSet "); |
342 | 2946 rem_set()->verify(); |
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|
2947 |
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|
2948 if (failures) { |
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|
2949 gclog_or_tty->print_cr("Heap:"); |
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|
2950 print_on(gclog_or_tty, true /* extended */); |
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|
2951 gclog_or_tty->print_cr(""); |
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|
2952 #ifndef PRODUCT |
1044 | 2953 if (VerifyDuringGC && G1VerifyDuringGCPrintReachable) { |
1388 | 2954 concurrent_mark()->print_reachable("at-verification-failure", |
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2955 vo, false /* all */); |
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|
2956 } |
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|
2957 #endif |
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|
2958 gclog_or_tty->flush(); |
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2959 } |
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2960 guarantee(!failures, "there should not have been any failures"); |
342 | 2961 } else { |
2962 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
2963 } | |
2964 } | |
2965 | |
2966 class PrintRegionClosure: public HeapRegionClosure { | |
2967 outputStream* _st; | |
2968 public: | |
2969 PrintRegionClosure(outputStream* st) : _st(st) {} | |
2970 bool doHeapRegion(HeapRegion* r) { | |
2971 r->print_on(_st); | |
2972 return false; | |
2973 } | |
2974 }; | |
2975 | |
838
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2976 void G1CollectedHeap::print() const { print_on(tty); } |
342 | 2977 |
2978 void G1CollectedHeap::print_on(outputStream* st) const { | |
838
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2979 print_on(st, PrintHeapAtGCExtended); |
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2980 } |
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2981 |
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2982 void G1CollectedHeap::print_on(outputStream* st, bool extended) const { |
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2983 st->print(" %-20s", "garbage-first heap"); |
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2984 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
846
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2985 capacity()/K, used_unlocked()/K); |
838
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2986 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
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2987 _g1_storage.low_boundary(), |
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2988 _g1_storage.high(), |
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2989 _g1_storage.high_boundary()); |
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2990 st->cr(); |
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2991 st->print(" region size " SIZE_FORMAT "K, ", |
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2992 HeapRegion::GrainBytes/K); |
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2993 size_t young_regions = _young_list->length(); |
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2994 st->print(SIZE_FORMAT " young (" SIZE_FORMAT "K), ", |
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2995 young_regions, young_regions * HeapRegion::GrainBytes / K); |
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2996 size_t survivor_regions = g1_policy()->recorded_survivor_regions(); |
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2997 st->print(SIZE_FORMAT " survivors (" SIZE_FORMAT "K)", |
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2998 survivor_regions, survivor_regions * HeapRegion::GrainBytes / K); |
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2999 st->cr(); |
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3000 perm()->as_gen()->print_on(st); |
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3001 if (extended) { |
1020
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3002 st->cr(); |
838
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3003 print_on_extended(st); |
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3004 } |
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3005 } |
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3006 |
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3007 void G1CollectedHeap::print_on_extended(outputStream* st) const { |
342 | 3008 PrintRegionClosure blk(st); |
3766 | 3009 heap_region_iterate(&blk); |
342 | 3010 } |
3011 | |
3012 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { | |
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3013 if (G1CollectedHeap::use_parallel_gc_threads()) { |
1019 | 3014 workers()->print_worker_threads_on(st); |
3015 } | |
3016 _cmThread->print_on(st); | |
342 | 3017 st->cr(); |
1019 | 3018 _cm->print_worker_threads_on(st); |
3019 _cg1r->print_worker_threads_on(st); | |
342 | 3020 st->cr(); |
3021 } | |
3022 | |
3023 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
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3024 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 3025 workers()->threads_do(tc); |
3026 } | |
3027 tc->do_thread(_cmThread); | |
794 | 3028 _cg1r->threads_do(tc); |
342 | 3029 } |
3030 | |
3031 void G1CollectedHeap::print_tracing_info() const { | |
3032 // We'll overload this to mean "trace GC pause statistics." | |
3033 if (TraceGen0Time || TraceGen1Time) { | |
3034 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
3035 // to that. | |
3036 g1_policy()->print_tracing_info(); | |
3037 } | |
751 | 3038 if (G1SummarizeRSetStats) { |
342 | 3039 g1_rem_set()->print_summary_info(); |
3040 } | |
1282 | 3041 if (G1SummarizeConcMark) { |
342 | 3042 concurrent_mark()->print_summary_info(); |
3043 } | |
3044 g1_policy()->print_yg_surv_rate_info(); | |
3045 SpecializationStats::print(); | |
3046 } | |
3047 | |
3777
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3048 #ifndef PRODUCT |
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3049 // Helpful for debugging RSet issues. |
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3050 |
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3051 class PrintRSetsClosure : public HeapRegionClosure { |
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3052 private: |
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3053 const char* _msg; |
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3054 size_t _occupied_sum; |
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3055 |
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3056 public: |
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3057 bool doHeapRegion(HeapRegion* r) { |
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3058 HeapRegionRemSet* hrrs = r->rem_set(); |
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3059 size_t occupied = hrrs->occupied(); |
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3060 _occupied_sum += occupied; |
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3061 |
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3062 gclog_or_tty->print_cr("Printing RSet for region "HR_FORMAT, |
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3063 HR_FORMAT_PARAMS(r)); |
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3064 if (occupied == 0) { |
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3065 gclog_or_tty->print_cr(" RSet is empty"); |
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3066 } else { |
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3067 hrrs->print(); |
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3068 } |
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3069 gclog_or_tty->print_cr("----------"); |
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3070 return false; |
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|
3071 } |
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3072 |
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3073 PrintRSetsClosure(const char* msg) : _msg(msg), _occupied_sum(0) { |
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3074 gclog_or_tty->cr(); |
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3075 gclog_or_tty->print_cr("========================================"); |
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3076 gclog_or_tty->print_cr(msg); |
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|
3077 gclog_or_tty->cr(); |
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|
3078 } |
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3079 |
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3080 ~PrintRSetsClosure() { |
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3081 gclog_or_tty->print_cr("Occupied Sum: "SIZE_FORMAT, _occupied_sum); |
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3082 gclog_or_tty->print_cr("========================================"); |
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3083 gclog_or_tty->cr(); |
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|
3084 } |
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|
3085 }; |
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3086 |
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3087 void G1CollectedHeap::print_cset_rsets() { |
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3088 PrintRSetsClosure cl("Printing CSet RSets"); |
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3089 collection_set_iterate(&cl); |
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|
3090 } |
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3091 |
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3092 void G1CollectedHeap::print_all_rsets() { |
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3093 PrintRSetsClosure cl("Printing All RSets");; |
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3094 heap_region_iterate(&cl); |
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|
3095 } |
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3096 #endif // PRODUCT |
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3097 |
342 | 3098 G1CollectedHeap* G1CollectedHeap::heap() { |
3099 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
3100 "not a garbage-first heap"); | |
3101 return _g1h; | |
3102 } | |
3103 | |
3104 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
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3105 // always_do_update_barrier = false; |
342 | 3106 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
3107 // Call allocation profiler | |
3108 AllocationProfiler::iterate_since_last_gc(); | |
3109 // Fill TLAB's and such | |
3110 ensure_parsability(true); | |
3111 } | |
3112 | |
3113 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
3114 // FIXME: what is this about? | |
3115 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
3116 // is set. | |
3117 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
3118 "derived pointer present")); | |
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3119 // always_do_update_barrier = true; |
342 | 3120 } |
3121 | |
1973 | 3122 HeapWord* G1CollectedHeap::do_collection_pause(size_t word_size, |
3123 unsigned int gc_count_before, | |
3124 bool* succeeded) { | |
3125 assert_heap_not_locked_and_not_at_safepoint(); | |
342 | 3126 g1_policy()->record_stop_world_start(); |
1973 | 3127 VM_G1IncCollectionPause op(gc_count_before, |
3128 word_size, | |
3129 false, /* should_initiate_conc_mark */ | |
3130 g1_policy()->max_pause_time_ms(), | |
3131 GCCause::_g1_inc_collection_pause); | |
3132 VMThread::execute(&op); | |
3133 | |
3134 HeapWord* result = op.result(); | |
3135 bool ret_succeeded = op.prologue_succeeded() && op.pause_succeeded(); | |
3136 assert(result == NULL || ret_succeeded, | |
3137 "the result should be NULL if the VM did not succeed"); | |
3138 *succeeded = ret_succeeded; | |
3139 | |
3140 assert_heap_not_locked(); | |
3141 return result; | |
342 | 3142 } |
3143 | |
3144 void | |
3145 G1CollectedHeap::doConcurrentMark() { | |
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3146 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
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3147 if (!_cmThread->in_progress()) { |
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3148 _cmThread->set_started(); |
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3149 CGC_lock->notify(); |
342 | 3150 } |
3151 } | |
3152 | |
3153 // <NEW PREDICTION> | |
3154 | |
3155 double G1CollectedHeap::predict_region_elapsed_time_ms(HeapRegion *hr, | |
3156 bool young) { | |
3157 return _g1_policy->predict_region_elapsed_time_ms(hr, young); | |
3158 } | |
3159 | |
3160 void G1CollectedHeap::check_if_region_is_too_expensive(double | |
3161 predicted_time_ms) { | |
3162 _g1_policy->check_if_region_is_too_expensive(predicted_time_ms); | |
3163 } | |
3164 | |
3165 size_t G1CollectedHeap::pending_card_num() { | |
3166 size_t extra_cards = 0; | |
3167 JavaThread *curr = Threads::first(); | |
3168 while (curr != NULL) { | |
3169 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
3170 extra_cards += dcq.size(); | |
3171 curr = curr->next(); | |
3172 } | |
3173 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
3174 size_t buffer_size = dcqs.buffer_size(); | |
3175 size_t buffer_num = dcqs.completed_buffers_num(); | |
3176 return buffer_size * buffer_num + extra_cards; | |
3177 } | |
3178 | |
3179 size_t G1CollectedHeap::max_pending_card_num() { | |
3180 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
3181 size_t buffer_size = dcqs.buffer_size(); | |
3182 size_t buffer_num = dcqs.completed_buffers_num(); | |
3183 int thread_num = Threads::number_of_threads(); | |
3184 return (buffer_num + thread_num) * buffer_size; | |
3185 } | |
3186 | |
3187 size_t G1CollectedHeap::cards_scanned() { | |
1861 | 3188 return g1_rem_set()->cardsScanned(); |
342 | 3189 } |
3190 | |
3191 void | |
3192 G1CollectedHeap::setup_surviving_young_words() { | |
3193 guarantee( _surviving_young_words == NULL, "pre-condition" ); | |
3194 size_t array_length = g1_policy()->young_cset_length(); | |
3195 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, array_length); | |
3196 if (_surviving_young_words == NULL) { | |
3197 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
3198 "Not enough space for young surv words summary."); | |
3199 } | |
3200 memset(_surviving_young_words, 0, array_length * sizeof(size_t)); | |
845
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|
3201 #ifdef ASSERT |
342 | 3202 for (size_t i = 0; i < array_length; ++i) { |
845
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|
3203 assert( _surviving_young_words[i] == 0, "memset above" ); |
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|
3204 } |
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|
3205 #endif // !ASSERT |
342 | 3206 } |
3207 | |
3208 void | |
3209 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
3210 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
3211 size_t array_length = g1_policy()->young_cset_length(); | |
3212 for (size_t i = 0; i < array_length; ++i) | |
3213 _surviving_young_words[i] += surv_young_words[i]; | |
3214 } | |
3215 | |
3216 void | |
3217 G1CollectedHeap::cleanup_surviving_young_words() { | |
3218 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
3219 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
3220 _surviving_young_words = NULL; | |
3221 } | |
3222 | |
3223 // </NEW PREDICTION> | |
3224 | |
3777
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|
3225 #ifdef ASSERT |
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|
3226 class VerifyCSetClosure: public HeapRegionClosure { |
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|
3227 public: |
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|
3228 bool doHeapRegion(HeapRegion* hr) { |
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|
3229 // Here we check that the CSet region's RSet is ready for parallel |
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|
3230 // iteration. The fields that we'll verify are only manipulated |
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|
3231 // when the region is part of a CSet and is collected. Afterwards, |
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|
3232 // we reset these fields when we clear the region's RSet (when the |
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|
3233 // region is freed) so they are ready when the region is |
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|
3234 // re-allocated. The only exception to this is if there's an |
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|
3235 // evacuation failure and instead of freeing the region we leave |
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|
3236 // it in the heap. In that case, we reset these fields during |
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|
3237 // evacuation failure handling. |
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|
3238 guarantee(hr->rem_set()->verify_ready_for_par_iteration(), "verification"); |
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|
3239 |
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|
3240 // Here's a good place to add any other checks we'd like to |
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changeset
|
3241 // perform on CSet regions. |
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
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|
3242 return false; |
0414c1049f15
6923991: G1: improve scalability of RSet scanning
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|
3243 } |
0414c1049f15
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|
3244 }; |
3777
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|
3245 #endif // ASSERT |
1261
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|
3246 |
1709 | 3247 #if TASKQUEUE_STATS |
3248 void G1CollectedHeap::print_taskqueue_stats_hdr(outputStream* const st) { | |
3249 st->print_raw_cr("GC Task Stats"); | |
3250 st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); | |
3251 st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); | |
3252 } | |
3253 | |
3254 void G1CollectedHeap::print_taskqueue_stats(outputStream* const st) const { | |
3255 print_taskqueue_stats_hdr(st); | |
3256 | |
3257 TaskQueueStats totals; | |
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
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|
3258 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 3259 for (int i = 0; i < n; ++i) { |
3260 st->print("%3d ", i); task_queue(i)->stats.print(st); st->cr(); | |
3261 totals += task_queue(i)->stats; | |
3262 } | |
3263 st->print_raw("tot "); totals.print(st); st->cr(); | |
3264 | |
3265 DEBUG_ONLY(totals.verify()); | |
3266 } | |
3267 | |
3268 void G1CollectedHeap::reset_taskqueue_stats() { | |
1755
8e5955ddf8e4
6978300: G1: debug builds crash if ParallelGCThreads==0
jcoomes
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1719
diff
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|
3269 const int n = workers() != NULL ? workers()->total_workers() : 1; |
1709 | 3270 for (int i = 0; i < n; ++i) { |
3271 task_queue(i)->stats.reset(); | |
3272 } | |
3273 } | |
3274 #endif // TASKQUEUE_STATS | |
3275 | |
1973 | 3276 bool |
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|
3277 G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { |
2152 | 3278 assert_at_safepoint(true /* should_be_vm_thread */); |
3279 guarantee(!is_gc_active(), "collection is not reentrant"); | |
3280 | |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
3281 if (GC_locker::check_active_before_gc()) { |
1973 | 3282 return false; |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
3283 } |
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
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|
3284 |
2125
7246a374a9f2
6458402: 3 jvmti tests fail with CMS and +ExplicitGCInvokesConcurrent
kamg
parents:
2039
diff
changeset
|
3285 SvcGCMarker sgcm(SvcGCMarker::MINOR); |
2039
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
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2038
diff
changeset
|
3286 ResourceMark rm; |
7c5250dbd584
6896624: G1: hotspot:::gc and hotspot:::mem-pool-gc probes are not fired
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diff
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|
3287 |
838
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6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3288 if (PrintHeapAtGC) { |
0316eac49d5a
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|
3289 Universe::print_heap_before_gc(); |
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6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3290 } |
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|
3291 |
2152 | 3292 verify_region_sets_optional(); |
2433
abdfc822206f
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2432
diff
changeset
|
3293 verify_dirty_young_regions(); |
2152 | 3294 |
838
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|
3295 { |
1359
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changeset
|
3296 // This call will decide whether this pause is an initial-mark |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
3297 // pause. If it is, during_initial_mark_pause() will return true |
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diff
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|
3298 // for the duration of this pause. |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
3299 g1_policy()->decide_on_conc_mark_initiation(); |
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
3300 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3301 char verbose_str[128]; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
3302 sprintf(verbose_str, "GC pause "); |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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diff
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|
3303 if (g1_policy()->full_young_gcs()) { |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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diff
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|
3304 strcat(verbose_str, "(young)"); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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diff
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|
3305 } else { |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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diff
changeset
|
3306 strcat(verbose_str, "(partial)"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3307 } |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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diff
changeset
|
3308 if (g1_policy()->during_initial_mark_pause()) { |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3309 strcat(verbose_str, " (initial-mark)"); |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
changeset
|
3310 // We are about to start a marking cycle, so we increment the |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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parents:
1611
diff
changeset
|
3311 // full collection counter. |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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1611
diff
changeset
|
3312 increment_total_full_collections(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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diff
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|
3313 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3314 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
3315 // if PrintGCDetails is on, we'll print long statistics information |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
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|
3316 // in the collector policy code, so let's not print this as the output |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
3317 // is messy if we do. |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
3318 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3319 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3320 TraceTime t(verbose_str, PrintGC && !PrintGCDetails, true, gclog_or_tty); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3321 |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3322 TraceCollectorStats tcs(g1mm()->incremental_collection_counters()); |
3356
78542e2b5e35
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
3323
diff
changeset
|
3323 TraceMemoryManagerStats tms(false /* fullGC */, gc_cause()); |
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3324 |
2361 | 3325 // If the secondary_free_list is not empty, append it to the |
3326 // free_list. No need to wait for the cleanup operation to finish; | |
3327 // the region allocation code will check the secondary_free_list | |
3328 // and wait if necessary. If the G1StressConcRegionFreeing flag is | |
3329 // set, skip this step so that the region allocation code has to | |
3330 // get entries from the secondary_free_list. | |
2152 | 3331 if (!G1StressConcRegionFreeing) { |
2361 | 3332 append_secondary_free_list_if_not_empty_with_lock(); |
2152 | 3333 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
3334 |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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3830
diff
changeset
|
3335 assert(check_young_list_well_formed(), |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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3830
diff
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|
3336 "young list should be well formed"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
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|
3337 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
3338 { // Call to jvmpi::post_class_unload_events must occur outside of active GC |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3339 IsGCActiveMark x; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
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|
3340 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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diff
changeset
|
3341 gc_prologue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
changeset
|
3342 increment_total_collections(false /* full gc */); |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3343 increment_gc_time_stamp(); |
342 | 3344 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3345 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
0316eac49d5a
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|
3346 HandleMark hm; // Discard invalid handles created during verification |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
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2432
diff
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|
3347 gclog_or_tty->print(" VerifyBeforeGC:"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
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|
3348 prepare_for_verify(); |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3349 Universe::verify(/* allow dirty */ false, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3766
diff
changeset
|
3350 /* silent */ false, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3766
diff
changeset
|
3351 /* option */ VerifyOption_G1UsePrevMarking); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
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parents:
3766
diff
changeset
|
3352 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
diff
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|
3353 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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|
3354 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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changeset
|
3355 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
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|
3356 |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
3357 // Please see comment in G1CollectedHeap::ref_processing_init() |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
3358 // to see how reference processing currently works in G1. |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
3359 // |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3360 // We want to turn off ref discovery, if necessary, and turn it back on |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3361 // on again later if we do. XXX Dubious: why is discovery disabled? |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3362 bool was_enabled = ref_processor()->discovery_enabled(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
changeset
|
3363 if (was_enabled) ref_processor()->disable_discovery(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
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811
diff
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|
3364 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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changeset
|
3365 // Forget the current alloc region (we might even choose it to be part |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3366 // of the collection set!). |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3367 release_mutator_alloc_region(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3368 |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3369 // We should call this after we retire the mutator alloc |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3370 // region(s) so that all the ALLOC / RETIRE events are generated |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3371 // before the start GC event. |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3372 _hr_printer.start_gc(false /* full */, (size_t) total_collections()); |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3373 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3374 // The elapsed time induced by the start time below deliberately elides |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3375 // the possible verification above. |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3376 double start_time_sec = os::elapsedTime(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3377 size_t start_used_bytes = used(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3378 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3379 #if YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3380 gclog_or_tty->print_cr("\nBefore recording pause start.\nYoung_list:"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3381 _young_list->print(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3382 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
|
3383 #endif // YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3384 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3385 g1_policy()->record_collection_pause_start(start_time_sec, |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3386 start_used_bytes); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3387 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3388 #if YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3389 gclog_or_tty->print_cr("\nAfter recording pause start.\nYoung_list:"); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3390 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3391 #endif // YOUNG_LIST_VERBOSE |
342 | 3392 |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1313
diff
changeset
|
3393 if (g1_policy()->during_initial_mark_pause()) { |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3394 concurrent_mark()->checkpointRootsInitialPre(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3395 } |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3396 perm_gen()->save_marks(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3397 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3398 // We must do this before any possible evacuation that should propagate |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3399 // marks. |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3400 if (mark_in_progress()) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3401 double start_time_sec = os::elapsedTime(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3402 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3403 _cm->drainAllSATBBuffers(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3404 double finish_mark_ms = (os::elapsedTime() - start_time_sec) * 1000.0; |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3405 g1_policy()->record_satb_drain_time(finish_mark_ms); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3406 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3407 // Record the number of elements currently on the mark stack, so we |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3408 // only iterate over these. (Since evacuation may add to the mark |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3409 // stack, doing more exposes race conditions.) If no mark is in |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3410 // progress, this will be zero. |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3411 _cm->set_oops_do_bound(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3412 |
3378
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3413 if (mark_in_progress()) { |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3414 concurrent_mark()->newCSet(); |
3378
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3415 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3416 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3417 #if YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3418 gclog_or_tty->print_cr("\nBefore choosing collection set.\nYoung_list:"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3419 _young_list->print(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3420 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
|
3421 #endif // YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3422 |
1707 | 3423 g1_policy()->choose_collection_set(target_pause_time_ms); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3424 |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3425 if (_hr_printer.is_active()) { |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3426 HeapRegion* hr = g1_policy()->collection_set(); |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3427 while (hr != NULL) { |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3428 G1HRPrinter::RegionType type; |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3429 if (!hr->is_young()) { |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3430 type = G1HRPrinter::Old; |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3431 } else if (hr->is_survivor()) { |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3432 type = G1HRPrinter::Survivor; |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3433 } else { |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3434 type = G1HRPrinter::Eden; |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3435 } |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3436 _hr_printer.cset(hr); |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3437 hr = hr->next_in_collection_set(); |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3438 } |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3439 } |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3440 |
3378
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3441 // We have chosen the complete collection set. If marking is |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3442 // active then, we clear the region fields of any of the |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3443 // concurrent marking tasks whose region fields point into |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3444 // the collection set as these values will become stale. This |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3445 // will cause the owning marking threads to claim a new region |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3446 // when marking restarts. |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3447 if (mark_in_progress()) { |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3448 concurrent_mark()->reset_active_task_region_fields_in_cset(); |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3449 } |
69293e516993
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
3377
diff
changeset
|
3450 |
3777
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3451 #ifdef ASSERT |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3452 VerifyCSetClosure cl; |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3453 collection_set_iterate(&cl); |
e8b0b0392037
7046182: G1: remove unnecessary iterations over the collection set
tonyp
parents:
3774
diff
changeset
|
3454 #endif // ASSERT |
1707 | 3455 |
3456 setup_surviving_young_words(); | |
3457 | |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3458 // Initialize the GC alloc regions. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3459 init_gc_alloc_regions(); |
1707 | 3460 |
3461 // Actually do the work... | |
3462 evacuate_collection_set(); | |
3463 | |
3464 free_collection_set(g1_policy()->collection_set()); | |
3465 g1_policy()->clear_collection_set(); | |
3466 | |
3467 cleanup_surviving_young_words(); | |
3468 | |
3469 // Start a new incremental collection set for the next pause. | |
3470 g1_policy()->start_incremental_cset_building(); | |
3471 | |
3472 // Clear the _cset_fast_test bitmap in anticipation of adding | |
3473 // regions to the incremental collection set for the next | |
3474 // evacuation pause. | |
3475 clear_cset_fast_test(); | |
3476 | |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3477 _young_list->reset_sampled_info(); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3478 |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3479 // Don't check the whole heap at this point as the |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3480 // GC alloc regions from this pause have been tagged |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3481 // as survivors and moved on to the survivor list. |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3482 // Survivor regions will fail the !is_young() check. |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3483 assert(check_young_list_empty(false /* check_heap */), |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3484 "young list should be empty"); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3485 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3486 #if YOUNG_LIST_VERBOSE |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3487 gclog_or_tty->print_cr("Before recording survivors.\nYoung List:"); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3488 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3489 #endif // YOUNG_LIST_VERBOSE |
342 | 3490 |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3491 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3492 _young_list->first_survivor_region(), |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3493 _young_list->last_survivor_region()); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3494 |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3495 _young_list->reset_auxilary_lists(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3496 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3497 if (evacuation_failed()) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3498 _summary_bytes_used = recalculate_used(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3499 } else { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3500 // The "used" of the the collection set have already been subtracted |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3501 // when they were freed. Add in the bytes evacuated. |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3502 _summary_bytes_used += g1_policy()->bytes_copied_during_gc(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3503 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3504 |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
3505 if (g1_policy()->during_initial_mark_pause()) { |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3506 concurrent_mark()->checkpointRootsInitialPost(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3507 set_marking_started(); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3508 // CAUTION: after the doConcurrentMark() call below, |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3509 // the concurrent marking thread(s) could be running |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3510 // concurrently with us. Make sure that anything after |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3511 // this point does not assume that we are the only GC thread |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3512 // running. Note: of course, the actual marking work will |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3513 // not start until the safepoint itself is released in |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3514 // ConcurrentGCThread::safepoint_desynchronize(). |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3515 doConcurrentMark(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3516 } |
342 | 3517 |
3285
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
3518 allocate_dummy_regions(); |
49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
tonyp
parents:
2433
diff
changeset
|
3519 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3520 #if YOUNG_LIST_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3521 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
|
3522 _young_list->print(); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
3523 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
|
3524 #endif // YOUNG_LIST_VERBOSE |
342 | 3525 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3526 init_mutator_alloc_region(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3527 |
3920
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3528 { |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3529 size_t expand_bytes = g1_policy()->expansion_amount(); |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3530 if (expand_bytes > 0) { |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3531 size_t bytes_before = capacity(); |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3532 if (!expand(expand_bytes)) { |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3533 // We failed to expand the heap so let's verify that |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3534 // committed/uncommitted amount match the backing store |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3535 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3536 assert(max_capacity() == _g1_storage.reserved_size(), "reserved size mismatch"); |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3537 } |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3538 } |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3539 } |
af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
brutisso
parents:
3919
diff
changeset
|
3540 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3541 double end_time_sec = os::elapsedTime(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3542 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
|
3543 g1_policy()->record_pause_time_ms(pause_time_ms); |
1707 | 3544 g1_policy()->record_collection_pause_end(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3545 |
1089
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3546 MemoryService::track_memory_usage(); |
db0d5eba9d20
6815790: G1: Missing MemoryPoolMXBeans with -XX:+UseG1GC
tonyp
parents:
1088
diff
changeset
|
3547 |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3548 // In prepare_for_verify() below we'll need to scan the deferred |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3549 // update buffers to bring the RSets up-to-date if |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3550 // G1HRRSFlushLogBuffersOnVerify has been set. While scanning |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3551 // the update buffers we'll probably need to scan cards on the |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3552 // regions we just allocated to (i.e., the GC alloc |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3553 // regions). However, during the last GC we called |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3554 // set_saved_mark() on all the GC alloc regions, so card |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3555 // scanning might skip the [saved_mark_word()...top()] area of |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3556 // those regions (i.e., the area we allocated objects into |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3557 // during the last GC). But it shouldn't. Given that |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3558 // saved_mark_word() is conditional on whether the GC time stamp |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3559 // on the region is current or not, by incrementing the GC time |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3560 // stamp here we invalidate all the GC time stamps on all the |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3561 // regions and saved_mark_word() will simply return top() for |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3562 // all the regions. This is a nicer way of ensuring this rather |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3563 // than iterating over the regions and fixing them. In fact, the |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3564 // GC time stamp increment here also ensures that |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3565 // saved_mark_word() will return top() between pauses, i.e., |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3566 // during concurrent refinement. So we don't need the |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3567 // is_gc_active() check to decided which top to use when |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3568 // scanning cards (see CR 7039627). |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3569 increment_gc_time_stamp(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3570 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3571 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3572 HandleMark hm; // Discard invalid handles created during verification |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3573 gclog_or_tty->print(" VerifyAfterGC:"); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3574 prepare_for_verify(); |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3575 Universe::verify(/* allow dirty */ true, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3576 /* silent */ false, |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
|
3577 /* option */ VerifyOption_G1UsePrevMarking); |
342 | 3578 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3579 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3580 if (was_enabled) ref_processor()->enable_discovery(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3581 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3582 { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3583 size_t expand_bytes = g1_policy()->expansion_amount(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3584 if (expand_bytes > 0) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3585 size_t bytes_before = capacity(); |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3886
diff
changeset
|
3586 // No need for an ergo verbose message here, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3886
diff
changeset
|
3587 // expansion_amount() does this when it returns a value > 0. |
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3588 if (!expand(expand_bytes)) { |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3589 // We failed to expand the heap so let's verify that |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3590 // committed/uncommitted amount match the backing store |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3591 assert(capacity() == _g1_storage.committed_size(), "committed size mismatch"); |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3592 assert(max_capacity() == _g1_storage.reserved_size(), "reserved size mismatch"); |
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
johnc
parents:
2173
diff
changeset
|
3593 } |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3594 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3595 } |
3778
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3596 |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3597 // We should do this after we potentially expand the heap so |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3598 // that all the COMMIT events are generated before the end GC |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3599 // event, and after we retire the GC alloc regions so that all |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3600 // RETIRE events are generated before the end GC event. |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3601 _hr_printer.end_gc(false /* full */, (size_t) total_collections()); |
5f6f2615433a
7049999: G1: Make the G1PrintHeapRegions output consistent and complete
tonyp
parents:
3777
diff
changeset
|
3602 |
3764
053d84a76d3d
7032531: G1: enhance GC logging to include more accurate eden / survivor size transitions
tonyp
parents:
3378
diff
changeset
|
3603 // We have to do this after we decide whether to expand the heap or not. |
053d84a76d3d
7032531: G1: enhance GC logging to include more accurate eden / survivor size transitions
tonyp
parents:
3378
diff
changeset
|
3604 g1_policy()->print_heap_transition(); |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3605 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3606 if (mark_in_progress()) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3607 concurrent_mark()->update_g1_committed(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3608 } |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3609 |
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3610 #ifdef TRACESPINNING |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3611 ParallelTaskTerminator::print_termination_counts(); |
546
05c6d52fa7a9
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
545
diff
changeset
|
3612 #endif |
342 | 3613 |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3614 gc_epilogue(false); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3615 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3616 |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3617 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3618 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
|
3619 print_tracing_info(); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3620 vm_exit(-1); |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3621 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3622 } |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3623 |
3766 | 3624 _hrs.verify_optional(); |
2152 | 3625 verify_region_sets_optional(); |
3626 | |
1709 | 3627 TASKQUEUE_STATS_ONLY(if (ParallelGCVerbose) print_taskqueue_stats()); |
3628 TASKQUEUE_STATS_ONLY(reset_taskqueue_stats()); | |
3629 | |
838
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3630 if (PrintHeapAtGC) { |
0316eac49d5a
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
tonyp
parents:
811
diff
changeset
|
3631 Universe::print_heap_after_gc(); |
342 | 3632 } |
3289
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3633 g1mm()->update_counters(); |
b52782ae3880
6946417: G1: Java VisualVM does not support G1 properly.
jmasa
parents:
3285
diff
changeset
|
3634 |
884
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3635 if (G1SummarizeRSetStats && |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3636 (G1SummarizeRSetStatsPeriod > 0) && |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3637 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3638 g1_rem_set()->print_summary_info(); |
83b687ce3090
6866591: G1: print update buffer processing stats more often
tonyp
parents:
883
diff
changeset
|
3639 } |
1973 | 3640 |
3641 return true; | |
342 | 3642 } |
3643 | |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3644 size_t G1CollectedHeap::desired_plab_sz(GCAllocPurpose purpose) |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3645 { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3646 size_t gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3647 switch (purpose) { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3648 case GCAllocForSurvived: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3649 gclab_word_size = YoungPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3650 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3651 case GCAllocForTenured: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3652 gclab_word_size = OldPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3653 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3654 default: |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3655 assert(false, "unknown GCAllocPurpose"); |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3656 gclab_word_size = OldPLABSize; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3657 break; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3658 } |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3659 return gclab_word_size; |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3660 } |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3661 |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3662 void G1CollectedHeap::init_mutator_alloc_region() { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3663 assert(_mutator_alloc_region.get() == NULL, "pre-condition"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3664 _mutator_alloc_region.init(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3665 } |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3666 |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3667 void G1CollectedHeap::release_mutator_alloc_region() { |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3668 _mutator_alloc_region.release(); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3669 assert(_mutator_alloc_region.get() == NULL, "post-condition"); |
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
3670 } |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1390
diff
changeset
|
3671 |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3672 void G1CollectedHeap::init_gc_alloc_regions() { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3673 assert_at_safepoint(true /* should_be_vm_thread */); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3674 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3675 _survivor_gc_alloc_region.init(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3676 _old_gc_alloc_region.init(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3677 HeapRegion* retained_region = _retained_old_gc_alloc_region; |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3678 _retained_old_gc_alloc_region = NULL; |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3679 |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3680 // We will discard the current GC alloc region if: |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3681 // a) it's in the collection set (it can happen!), |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3682 // b) it's already full (no point in using it), |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3683 // c) it's empty (this means that it was emptied during |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3684 // a cleanup and it should be on the free list now), or |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3685 // d) it's humongous (this means that it was emptied |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3686 // during a cleanup and was added to the free list, but |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3687 // has been subseqently used to allocate a humongous |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3688 // object that may be less than the region size). |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3689 if (retained_region != NULL && |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3690 !retained_region->in_collection_set() && |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3691 !(retained_region->top() == retained_region->end()) && |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3692 !retained_region->is_empty() && |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3693 !retained_region->isHumongous()) { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3694 retained_region->set_saved_mark(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3695 _old_gc_alloc_region.set(retained_region); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3696 _hr_printer.reuse(retained_region); |
342 | 3697 } |
3698 } | |
3699 | |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3700 void G1CollectedHeap::release_gc_alloc_regions() { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3701 _survivor_gc_alloc_region.release(); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3702 // If we have an old GC alloc region to release, we'll save it in |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3703 // _retained_old_gc_alloc_region. If we don't |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3704 // _retained_old_gc_alloc_region will become NULL. This is what we |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3705 // want either way so no reason to check explicitly for either |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3706 // condition. |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3707 _retained_old_gc_alloc_region = _old_gc_alloc_region.release(); |
342 | 3708 } |
3709 | |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3710 void G1CollectedHeap::abandon_gc_alloc_regions() { |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3711 assert(_survivor_gc_alloc_region.get() == NULL, "pre-condition"); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3712 assert(_old_gc_alloc_region.get() == NULL, "pre-condition"); |
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
3713 _retained_old_gc_alloc_region = NULL; |
342 | 3714 } |
3715 | |
3716 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
3717 _drain_in_progress = false; | |
3718 set_evac_failure_closure(cl); | |
3719 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
3720 } | |
3721 | |
3722 void G1CollectedHeap::finalize_for_evac_failure() { | |
3723 assert(_evac_failure_scan_stack != NULL && | |
3724 _evac_failure_scan_stack->length() == 0, | |
3725 "Postcondition"); | |
3726 assert(!_drain_in_progress, "Postcondition"); | |
1045 | 3727 delete _evac_failure_scan_stack; |
342 | 3728 _evac_failure_scan_stack = NULL; |
3729 } | |
3730 | |
3731 // *** Sequential G1 Evacuation | |
3732 | |
3733 class G1IsAliveClosure: public BoolObjectClosure { | |
3734 G1CollectedHeap* _g1; | |
3735 public: | |
3736 G1IsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
3737 void do_object(oop p) { assert(false, "Do not call."); } | |
3738 bool do_object_b(oop p) { | |
3739 // It is reachable if it is outside the collection set, or is inside | |
3740 // and forwarded. | |
3741 return !_g1->obj_in_cs(p) || p->is_forwarded(); | |
3742 } | |
3743 }; | |
3744 | |
3745 class G1KeepAliveClosure: public OopClosure { | |
3746 G1CollectedHeap* _g1; | |
3747 public: | |
3748 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3749 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3750 void do_oop( oop* p) { |
342 | 3751 oop obj = *p; |
3752 if (_g1->obj_in_cs(obj)) { | |
3753 assert( obj->is_forwarded(), "invariant" ); | |
3754 *p = obj->forwardee(); | |
3755 } | |
3756 } | |
3757 }; | |
3758 | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3759 class UpdateRSetDeferred : public OopsInHeapRegionClosure { |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3760 private: |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3761 G1CollectedHeap* _g1; |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3762 DirtyCardQueue *_dcq; |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3763 CardTableModRefBS* _ct_bs; |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3764 |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3765 public: |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3766 UpdateRSetDeferred(G1CollectedHeap* g1, DirtyCardQueue* dcq) : |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3767 _g1(g1), _ct_bs((CardTableModRefBS*)_g1->barrier_set()), _dcq(dcq) {} |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3768 |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3769 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3770 virtual void do_oop( oop* p) { do_oop_work(p); } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3771 template <class T> void do_oop_work(T* p) { |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3772 assert(_from->is_in_reserved(p), "paranoia"); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3773 if (!_from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
3774 !_from->is_survivor()) { |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3775 size_t card_index = _ct_bs->index_for(p); |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3776 if (_ct_bs->mark_card_deferred(card_index)) { |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3777 _dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index)); |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3778 } |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3779 } |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3780 } |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3781 }; |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3782 |
342 | 3783 class RemoveSelfPointerClosure: public ObjectClosure { |
3784 private: | |
3785 G1CollectedHeap* _g1; | |
3786 ConcurrentMark* _cm; | |
3787 HeapRegion* _hr; | |
3788 size_t _prev_marked_bytes; | |
3789 size_t _next_marked_bytes; | |
616
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
3790 OopsInHeapRegionClosure *_cl; |
342 | 3791 public: |
2133
2250ee17e258
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
2039
diff
changeset
|
3792 RemoveSelfPointerClosure(G1CollectedHeap* g1, HeapRegion* hr, |
2250ee17e258
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3793 OopsInHeapRegionClosure* cl) : |
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3794 _g1(g1), _hr(hr), _cm(_g1->concurrent_mark()), _prev_marked_bytes(0), |
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3795 _next_marked_bytes(0), _cl(cl) {} |
342 | 3796 |
3797 size_t prev_marked_bytes() { return _prev_marked_bytes; } | |
3798 size_t next_marked_bytes() { return _next_marked_bytes; } | |
3799 | |
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3800 // <original comment> |
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3801 // The original idea here was to coalesce evacuated and dead objects. |
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3802 // However that caused complications with the block offset table (BOT). |
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3803 // In particular if there were two TLABs, one of them partially refined. |
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3804 // |----- TLAB_1--------|----TLAB_2-~~~(partially refined part)~~~| |
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3805 // The BOT entries of the unrefined part of TLAB_2 point to the start |
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3806 // of TLAB_2. If the last object of the TLAB_1 and the first object |
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3807 // of TLAB_2 are coalesced, then the cards of the unrefined part |
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3808 // would point into middle of the filler object. |
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3809 // The current approach is to not coalesce and leave the BOT contents intact. |
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3810 // </original comment> |
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3811 // |
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3812 // We now reset the BOT when we start the object iteration over the |
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3813 // region and refine its entries for every object we come across. So |
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3814 // the above comment is not really relevant and we should be able |
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3815 // to coalesce dead objects if we want to. |
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3816 void do_object(oop obj) { |
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3817 HeapWord* obj_addr = (HeapWord*) obj; |
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3818 assert(_hr->is_in(obj_addr), "sanity"); |
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3819 size_t obj_size = obj->size(); |
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3820 _hr->update_bot_for_object(obj_addr, obj_size); |
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3821 if (obj->is_forwarded() && obj->forwardee() == obj) { |
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3822 // The object failed to move. |
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3823 assert(!_g1->is_obj_dead(obj), "We should not be preserving dead objs."); |
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3824 _cm->markPrev(obj); |
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3825 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
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3826 _prev_marked_bytes += (obj_size * HeapWordSize); |
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3827 if (_g1->mark_in_progress() && !_g1->is_obj_ill(obj)) { |
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3828 _cm->markAndGrayObjectIfNecessary(obj); |
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3829 } |
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3830 obj->set_mark(markOopDesc::prototype()); |
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3831 // While we were processing RSet buffers during the |
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3832 // collection, we actually didn't scan any cards on the |
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3833 // collection set, since we didn't want to update remebered |
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3834 // sets with entries that point into the collection set, given |
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3835 // that live objects fromthe collection set are about to move |
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3836 // and such entries will be stale very soon. This change also |
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3837 // dealt with a reliability issue which involved scanning a |
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3838 // card in the collection set and coming across an array that |
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3839 // was being chunked and looking malformed. The problem is |
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3840 // that, if evacuation fails, we might have remembered set |
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3841 // entries missing given that we skipped cards on the |
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3842 // collection set. So, we'll recreate such entries now. |
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3843 obj->oop_iterate(_cl); |
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3844 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
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3845 } else { |
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3846 // The object has been either evacuated or is dead. Fill it with a |
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3847 // dummy object. |
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3848 MemRegion mr((HeapWord*)obj, obj_size); |
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3849 CollectedHeap::fill_with_object(mr); |
342 | 3850 _cm->clearRangeBothMaps(mr); |
3851 } | |
3852 } | |
3853 }; | |
3854 | |
3855 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
1705 | 3856 UpdateRSetImmediate immediate_update(_g1h->g1_rem_set()); |
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3857 DirtyCardQueue dcq(&_g1h->dirty_card_queue_set()); |
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3858 UpdateRSetDeferred deferred_update(_g1h, &dcq); |
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3859 OopsInHeapRegionClosure *cl; |
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3860 if (G1DeferredRSUpdate) { |
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3861 cl = &deferred_update; |
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3862 } else { |
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3863 cl = &immediate_update; |
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3864 } |
342 | 3865 HeapRegion* cur = g1_policy()->collection_set(); |
3866 while (cur != NULL) { | |
3867 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
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3868 assert(!cur->isHumongous(), "sanity"); |
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3869 |
342 | 3870 if (cur->evacuation_failed()) { |
3871 assert(cur->in_collection_set(), "bad CS"); | |
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3872 RemoveSelfPointerClosure rspc(_g1h, cur, cl); |
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3873 |
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3874 // In the common case we make sure that this is done when the |
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3875 // region is freed so that it is "ready-to-go" when it's |
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3876 // re-allocated. However, when evacuation failure happens, a |
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3877 // region will remain in the heap and might ultimately be added |
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3878 // to a CSet in the future. So we have to be careful here and |
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3879 // make sure the region's RSet is ready for parallel iteration |
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3880 // whenever this might be required in the future. |
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3881 cur->rem_set()->reset_for_par_iteration(); |
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3882 cur->reset_bot(); |
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3883 cl->set_region(cur); |
342 | 3884 cur->object_iterate(&rspc); |
3885 | |
3886 // A number of manipulations to make the TAMS be the current top, | |
3887 // and the marked bytes be the ones observed in the iteration. | |
3888 if (_g1h->concurrent_mark()->at_least_one_mark_complete()) { | |
3889 // The comments below are the postconditions achieved by the | |
3890 // calls. Note especially the last such condition, which says that | |
3891 // the count of marked bytes has been properly restored. | |
3892 cur->note_start_of_marking(false); | |
3893 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
3894 cur->add_to_marked_bytes(rspc.prev_marked_bytes()); | |
3895 // _next_marked_bytes == prev_marked_bytes. | |
3896 cur->note_end_of_marking(); | |
3897 // _prev_top_at_mark_start == top(), | |
3898 // _prev_marked_bytes == prev_marked_bytes | |
3899 } | |
3900 // If there is no mark in progress, we modified the _next variables | |
3901 // above needlessly, but harmlessly. | |
3902 if (_g1h->mark_in_progress()) { | |
3903 cur->note_start_of_marking(false); | |
3904 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
3905 // _next_marked_bytes == next_marked_bytes. | |
3906 } | |
3907 | |
3908 // Now make sure the region has the right index in the sorted array. | |
3909 g1_policy()->note_change_in_marked_bytes(cur); | |
3910 } | |
3911 cur = cur->next_in_collection_set(); | |
3912 } | |
3913 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
3914 | |
3915 // Now restore saved marks, if any. | |
3916 if (_objs_with_preserved_marks != NULL) { | |
3917 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
3918 guarantee(_objs_with_preserved_marks->length() == | |
3919 _preserved_marks_of_objs->length(), "Both or none."); | |
3920 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
3921 oop obj = _objs_with_preserved_marks->at(i); | |
3922 markOop m = _preserved_marks_of_objs->at(i); | |
3923 obj->set_mark(m); | |
3924 } | |
3925 // Delete the preserved marks growable arrays (allocated on the C heap). | |
3926 delete _objs_with_preserved_marks; | |
3927 delete _preserved_marks_of_objs; | |
3928 _objs_with_preserved_marks = NULL; | |
3929 _preserved_marks_of_objs = NULL; | |
3930 } | |
3931 } | |
3932 | |
3933 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
3934 _evac_failure_scan_stack->push(obj); | |
3935 } | |
3936 | |
3937 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
3938 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
3939 | |
3940 while (_evac_failure_scan_stack->length() > 0) { | |
3941 oop obj = _evac_failure_scan_stack->pop(); | |
3942 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
3943 obj->oop_iterate_backwards(_evac_failure_closure); | |
3944 } | |
3945 } | |
3946 | |
3947 oop | |
3948 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
3949 oop old) { | |
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3950 assert(obj_in_cs(old), |
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3951 err_msg("obj: "PTR_FORMAT" should still be in the CSet", |
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3952 (HeapWord*) old)); |
342 | 3953 markOop m = old->mark(); |
3954 oop forward_ptr = old->forward_to_atomic(old); | |
3955 if (forward_ptr == NULL) { | |
3956 // Forward-to-self succeeded. | |
3957 if (_evac_failure_closure != cl) { | |
3958 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
3959 assert(!_drain_in_progress, | |
3960 "Should only be true while someone holds the lock."); | |
3961 // Set the global evac-failure closure to the current thread's. | |
3962 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
3963 set_evac_failure_closure(cl); | |
3964 // Now do the common part. | |
3965 handle_evacuation_failure_common(old, m); | |
3966 // Reset to NULL. | |
3967 set_evac_failure_closure(NULL); | |
3968 } else { | |
3969 // The lock is already held, and this is recursive. | |
3970 assert(_drain_in_progress, "This should only be the recursive case."); | |
3971 handle_evacuation_failure_common(old, m); | |
3972 } | |
3973 return old; | |
3974 } else { | |
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3975 // Forward-to-self failed. Either someone else managed to allocate |
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3976 // space for this object (old != forward_ptr) or they beat us in |
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3977 // self-forwarding it (old == forward_ptr). |
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|
3978 assert(old == forward_ptr || !obj_in_cs(forward_ptr), |
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|
3979 err_msg("obj: "PTR_FORMAT" forwarded to: "PTR_FORMAT" " |
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|
3980 "should not be in the CSet", |
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|
3981 (HeapWord*) old, (HeapWord*) forward_ptr)); |
342 | 3982 return forward_ptr; |
3983 } | |
3984 } | |
3985 | |
3986 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
3987 set_evacuation_failed(true); | |
3988 | |
3989 preserve_mark_if_necessary(old, m); | |
3990 | |
3991 HeapRegion* r = heap_region_containing(old); | |
3992 if (!r->evacuation_failed()) { | |
3993 r->set_evacuation_failed(true); | |
3778
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|
3994 _hr_printer.evac_failure(r); |
342 | 3995 } |
3996 | |
3997 push_on_evac_failure_scan_stack(old); | |
3998 | |
3999 if (!_drain_in_progress) { | |
4000 // prevent recursion in copy_to_survivor_space() | |
4001 _drain_in_progress = true; | |
4002 drain_evac_failure_scan_stack(); | |
4003 _drain_in_progress = false; | |
4004 } | |
4005 } | |
4006 | |
4007 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
2038
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4008 assert(evacuation_failed(), "Oversaving!"); |
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|
4009 // We want to call the "for_promotion_failure" version only in the |
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|
4010 // case of a promotion failure. |
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|
4011 if (m->must_be_preserved_for_promotion_failure(obj)) { |
342 | 4012 if (_objs_with_preserved_marks == NULL) { |
4013 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
4014 _objs_with_preserved_marks = | |
4015 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
4016 _preserved_marks_of_objs = | |
4017 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
4018 } | |
4019 _objs_with_preserved_marks->push(obj); | |
4020 _preserved_marks_of_objs->push(m); | |
4021 } | |
4022 } | |
4023 | |
4024 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
4025 size_t word_size) { | |
3830
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4026 if (purpose == GCAllocForSurvived) { |
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4027 HeapWord* result = survivor_attempt_allocation(word_size); |
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4028 if (result != NULL) { |
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4029 return result; |
342 | 4030 } else { |
3830
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4031 // Let's try to allocate in the old gen in case we can fit the |
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|
4032 // object there. |
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|
4033 return old_attempt_allocation(word_size); |
342 | 4034 } |
3830
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|
4035 } else { |
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|
4036 assert(purpose == GCAllocForTenured, "sanity"); |
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4037 HeapWord* result = old_attempt_allocation(word_size); |
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|
4038 if (result != NULL) { |
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4039 return result; |
342 | 4040 } else { |
3830
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|
4041 // Let's try to allocate in the survivors in case we can fit the |
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|
4042 // object there. |
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|
4043 return survivor_attempt_allocation(word_size); |
342 | 4044 } |
3830
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|
4045 } |
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|
4046 |
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|
4047 ShouldNotReachHere(); |
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|
4048 // Trying to keep some compilers happy. |
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|
4049 return NULL; |
342 | 4050 } |
4051 | |
4052 #ifndef PRODUCT | |
4053 bool GCLabBitMapClosure::do_bit(size_t offset) { | |
4054 HeapWord* addr = _bitmap->offsetToHeapWord(offset); | |
4055 guarantee(_cm->isMarked(oop(addr)), "it should be!"); | |
4056 return true; | |
4057 } | |
4058 #endif // PRODUCT | |
4059 | |
3886
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4060 G1ParGCAllocBuffer::G1ParGCAllocBuffer(size_t gclab_word_size) : |
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4061 ParGCAllocBuffer(gclab_word_size), |
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|
4062 _should_mark_objects(false), |
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|
4063 _bitmap(G1CollectedHeap::heap()->reserved_region().start(), gclab_word_size), |
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|
4064 _retired(false) |
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|
4065 { |
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|
4066 //_should_mark_objects is set to true when G1ParCopyHelper needs to |
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|
4067 // mark the forwarded location of an evacuated object. |
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|
4068 // We set _should_mark_objects to true if marking is active, i.e. when we |
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|
4069 // need to propagate a mark, or during an initial mark pause, i.e. when we |
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|
4070 // need to mark objects immediately reachable by the roots. |
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|
4071 if (G1CollectedHeap::heap()->mark_in_progress() || |
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|
4072 G1CollectedHeap::heap()->g1_policy()->during_initial_mark_pause()) { |
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|
4073 _should_mark_objects = true; |
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|
4074 } |
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|
4075 } |
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|
4076 |
845
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|
4077 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num) |
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|
4078 : _g1h(g1h), |
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|
4079 _refs(g1h->task_queue(queue_num)), |
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|
4080 _dcq(&g1h->dirty_card_queue_set()), |
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
4081 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
4082 _g1_rem(g1h->g1_rem_set()), |
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
4083 _hash_seed(17), _queue_num(queue_num), |
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|
4084 _term_attempts(0), |
1391
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|
4085 _surviving_alloc_buffer(g1h->desired_plab_sz(GCAllocForSurvived)), |
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|
4086 _tenured_alloc_buffer(g1h->desired_plab_sz(GCAllocForTenured)), |
845
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|
4087 _age_table(false), |
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|
4088 _strong_roots_time(0), _term_time(0), |
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|
4089 _alloc_buffer_waste(0), _undo_waste(0) |
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|
4090 { |
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|
4091 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
df6caf649ff7
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diff
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|
4092 // we "sacrifice" entry 0 to keep track of surviving bytes for |
df6caf649ff7
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|
4093 // non-young regions (where the age is -1) |
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diff
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|
4094 // We also add a few elements at the beginning and at the end in |
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|
4095 // an attempt to eliminate cache contention |
df6caf649ff7
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|
4096 size_t real_length = 1 + _g1h->g1_policy()->young_cset_length(); |
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|
4097 size_t array_length = PADDING_ELEM_NUM + |
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|
4098 real_length + |
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|
4099 PADDING_ELEM_NUM; |
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|
4100 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length); |
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4101 if (_surviving_young_words_base == NULL) |
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|
4102 vm_exit_out_of_memory(array_length * sizeof(size_t), |
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|
4103 "Not enough space for young surv histo."); |
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4104 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; |
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4105 memset(_surviving_young_words, 0, real_length * sizeof(size_t)); |
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|
4106 |
1391
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|
4107 _alloc_buffers[GCAllocForSurvived] = &_surviving_alloc_buffer; |
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4108 _alloc_buffers[GCAllocForTenured] = &_tenured_alloc_buffer; |
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|
4109 |
845
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|
4110 _start = os::elapsedTime(); |
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|
4111 } |
342 | 4112 |
1709 | 4113 void |
4114 G1ParScanThreadState::print_termination_stats_hdr(outputStream* const st) | |
4115 { | |
4116 st->print_raw_cr("GC Termination Stats"); | |
4117 st->print_raw_cr(" elapsed --strong roots-- -------termination-------" | |
4118 " ------waste (KiB)------"); | |
4119 st->print_raw_cr("thr ms ms % ms % attempts" | |
4120 " total alloc undo"); | |
4121 st->print_raw_cr("--- --------- --------- ------ --------- ------ --------" | |
4122 " ------- ------- -------"); | |
4123 } | |
4124 | |
4125 void | |
4126 G1ParScanThreadState::print_termination_stats(int i, | |
4127 outputStream* const st) const | |
4128 { | |
4129 const double elapsed_ms = elapsed_time() * 1000.0; | |
4130 const double s_roots_ms = strong_roots_time() * 1000.0; | |
4131 const double term_ms = term_time() * 1000.0; | |
4132 st->print_cr("%3d %9.2f %9.2f %6.2f " | |
4133 "%9.2f %6.2f " SIZE_FORMAT_W(8) " " | |
4134 SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7) " " SIZE_FORMAT_W(7), | |
4135 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
4136 term_ms, term_ms * 100 / elapsed_ms, term_attempts(), | |
4137 (alloc_buffer_waste() + undo_waste()) * HeapWordSize / K, | |
4138 alloc_buffer_waste() * HeapWordSize / K, | |
4139 undo_waste() * HeapWordSize / K); | |
4140 } | |
4141 | |
1862
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|
4142 #ifdef ASSERT |
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|
4143 bool G1ParScanThreadState::verify_ref(narrowOop* ref) const { |
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|
4144 assert(ref != NULL, "invariant"); |
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|
4145 assert(UseCompressedOops, "sanity"); |
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|
4146 assert(!has_partial_array_mask(ref), err_msg("ref=" PTR_FORMAT, ref)); |
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|
4147 oop p = oopDesc::load_decode_heap_oop(ref); |
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|
4148 assert(_g1h->is_in_g1_reserved(p), |
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|
4149 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
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|
4150 return true; |
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|
4151 } |
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|
4152 |
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|
4153 bool G1ParScanThreadState::verify_ref(oop* ref) const { |
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|
4154 assert(ref != NULL, "invariant"); |
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|
4155 if (has_partial_array_mask(ref)) { |
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|
4156 // Must be in the collection set--it's already been copied. |
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|
4157 oop p = clear_partial_array_mask(ref); |
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4158 assert(_g1h->obj_in_cs(p), |
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4159 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
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4160 } else { |
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4161 oop p = oopDesc::load_decode_heap_oop(ref); |
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4162 assert(_g1h->is_in_g1_reserved(p), |
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4163 err_msg("ref=" PTR_FORMAT " p=" PTR_FORMAT, ref, intptr_t(p))); |
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4164 } |
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4165 return true; |
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4166 } |
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4167 |
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4168 bool G1ParScanThreadState::verify_task(StarTask ref) const { |
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4169 if (ref.is_narrow()) { |
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4170 return verify_ref((narrowOop*) ref); |
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4171 } else { |
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4172 return verify_ref((oop*) ref); |
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4173 } |
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4174 } |
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4175 #endif // ASSERT |
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4176 |
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4177 void G1ParScanThreadState::trim_queue() { |
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4178 StarTask ref; |
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4179 do { |
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4180 // Drain the overflow stack first, so other threads can steal. |
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4181 while (refs()->pop_overflow(ref)) { |
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4182 deal_with_reference(ref); |
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4183 } |
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4184 while (refs()->pop_local(ref)) { |
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4185 deal_with_reference(ref); |
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4186 } |
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4187 } while (!refs()->is_empty()); |
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4188 } |
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4189 |
342 | 4190 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : |
4191 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), | |
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4192 _par_scan_state(par_scan_state), |
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4193 _during_initial_mark(_g1->g1_policy()->during_initial_mark_pause()), |
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4194 _mark_in_progress(_g1->mark_in_progress()) { } |
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4195 |
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4196 template <class T> void G1ParCopyHelper::mark_object(T* p) { |
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4197 // This is called from do_oop_work for objects that are not |
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4198 // in the collection set. Objects in the collection set |
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4199 // are marked after they have been evacuated. |
342 | 4200 |
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4201 T heap_oop = oopDesc::load_heap_oop(p); |
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4202 if (!oopDesc::is_null(heap_oop)) { |
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4203 oop obj = oopDesc::decode_heap_oop(heap_oop); |
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4204 HeapWord* addr = (HeapWord*)obj; |
3323
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4205 if (_g1->is_in_g1_reserved(addr)) { |
342 | 4206 _cm->grayRoot(oop(addr)); |
3323
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4207 } |
342 | 4208 } |
4209 } | |
4210 | |
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4211 oop G1ParCopyHelper::copy_to_survivor_space(oop old, bool should_mark_copy) { |
342 | 4212 size_t word_sz = old->size(); |
4213 HeapRegion* from_region = _g1->heap_region_containing_raw(old); | |
4214 // +1 to make the -1 indexes valid... | |
4215 int young_index = from_region->young_index_in_cset()+1; | |
4216 assert( (from_region->is_young() && young_index > 0) || | |
4217 (!from_region->is_young() && young_index == 0), "invariant" ); | |
4218 G1CollectorPolicy* g1p = _g1->g1_policy(); | |
4219 markOop m = old->mark(); | |
545 | 4220 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
4221 : m->age(); | |
4222 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
342 | 4223 word_sz); |
4224 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
4225 oop obj = oop(obj_ptr); | |
4226 | |
4227 if (obj_ptr == NULL) { | |
4228 // This will either forward-to-self, or detect that someone else has | |
4229 // installed a forwarding pointer. | |
4230 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
4231 return _g1->handle_evacuation_failure_par(cl, old); | |
4232 } | |
4233 | |
526 | 4234 // We're going to allocate linearly, so might as well prefetch ahead. |
4235 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
4236 | |
342 | 4237 oop forward_ptr = old->forward_to_atomic(obj); |
4238 if (forward_ptr == NULL) { | |
4239 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
526 | 4240 if (g1p->track_object_age(alloc_purpose)) { |
4241 // We could simply do obj->incr_age(). However, this causes a | |
4242 // performance issue. obj->incr_age() will first check whether | |
4243 // the object has a displaced mark by checking its mark word; | |
4244 // getting the mark word from the new location of the object | |
4245 // stalls. So, given that we already have the mark word and we | |
4246 // are about to install it anyway, it's better to increase the | |
4247 // age on the mark word, when the object does not have a | |
4248 // displaced mark word. We're not expecting many objects to have | |
4249 // a displaced marked word, so that case is not optimized | |
4250 // further (it could be...) and we simply call obj->incr_age(). | |
4251 | |
4252 if (m->has_displaced_mark_helper()) { | |
4253 // in this case, we have to install the mark word first, | |
4254 // otherwise obj looks to be forwarded (the old mark word, | |
4255 // which contains the forward pointer, was copied) | |
4256 obj->set_mark(m); | |
4257 obj->incr_age(); | |
4258 } else { | |
4259 m = m->incr_age(); | |
545 | 4260 obj->set_mark(m); |
526 | 4261 } |
545 | 4262 _par_scan_state->age_table()->add(obj, word_sz); |
4263 } else { | |
4264 obj->set_mark(m); | |
526 | 4265 } |
4266 | |
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4267 // Mark the evacuated object or propagate "next" mark bit |
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4268 if (should_mark_copy) { |
342 | 4269 if (!use_local_bitmaps || |
4270 !_par_scan_state->alloc_buffer(alloc_purpose)->mark(obj_ptr)) { | |
4271 // if we couldn't mark it on the local bitmap (this happens when | |
4272 // the object was not allocated in the GCLab), we have to bite | |
4273 // the bullet and do the standard parallel mark | |
4274 _cm->markAndGrayObjectIfNecessary(obj); | |
4275 } | |
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4276 |
342 | 4277 if (_g1->isMarkedNext(old)) { |
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4278 // Unmark the object's old location so that marking |
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4279 // doesn't think the old object is alive. |
342 | 4280 _cm->nextMarkBitMap()->parClear((HeapWord*)old); |
4281 } | |
4282 } | |
4283 | |
4284 size_t* surv_young_words = _par_scan_state->surviving_young_words(); | |
4285 surv_young_words[young_index] += word_sz; | |
4286 | |
4287 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
4288 arrayOop(old)->set_length(0); | |
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4289 oop* old_p = set_partial_array_mask(old); |
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4290 _par_scan_state->push_on_queue(old_p); |
342 | 4291 } else { |
526 | 4292 // No point in using the slower heap_region_containing() method, |
4293 // given that we know obj is in the heap. | |
4294 _scanner->set_region(_g1->heap_region_containing_raw(obj)); | |
342 | 4295 obj->oop_iterate_backwards(_scanner); |
4296 } | |
4297 } else { | |
4298 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
4299 obj = forward_ptr; | |
4300 } | |
4301 return obj; | |
4302 } | |
4303 | |
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4304 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object> |
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4305 template <class T> |
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4306 void G1ParCopyClosure<do_gen_barrier, barrier, do_mark_object> |
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4307 ::do_oop_work(T* p) { |
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4308 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 4309 assert(barrier != G1BarrierRS || obj != NULL, |
4310 "Precondition: G1BarrierRS implies obj is nonNull"); | |
4311 | |
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4312 // Marking: |
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4313 // If the object is in the collection set, then the thread |
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4314 // that copies the object should mark, or propagate the |
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4315 // mark to, the evacuated object. |
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4316 // If the object is not in the collection set then we |
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4317 // should call the mark_object() method depending on the |
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4318 // value of the template parameter do_mark_object (which will |
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4319 // be true for root scanning closures during an initial mark |
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4320 // pause). |
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4321 // The mark_object() method first checks whether the object |
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4322 // is marked and, if not, attempts to mark the object. |
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4323 |
526 | 4324 // here the null check is implicit in the cset_fast_test() test |
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4325 if (_g1->in_cset_fast_test(obj)) { |
526 | 4326 if (obj->is_forwarded()) { |
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4327 oopDesc::encode_store_heap_oop(p, obj->forwardee()); |
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4328 // If we are a root scanning closure during an initial |
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4329 // mark pause (i.e. do_mark_object will be true) then |
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4330 // we also need to handle marking of roots in the |
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4331 // event of an evacuation failure. In the event of an |
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|
4332 // evacuation failure, the object is forwarded to itself |
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4333 // and not copied so let's mark it here. |
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4334 if (do_mark_object && obj->forwardee() == obj) { |
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4335 mark_object(p); |
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4336 } |
526 | 4337 } else { |
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4338 // We need to mark the copied object if we're a root scanning |
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4339 // closure during an initial mark pause (i.e. do_mark_object |
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4340 // will be true), or the object is already marked and we need |
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4341 // to propagate the mark to the evacuated copy. |
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4342 bool should_mark_copy = do_mark_object || |
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4343 _during_initial_mark || |
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4344 (_mark_in_progress && !_g1->is_obj_ill(obj)); |
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4345 |
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4346 oop copy_oop = copy_to_survivor_space(obj, should_mark_copy); |
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4347 oopDesc::encode_store_heap_oop(p, copy_oop); |
342 | 4348 } |
526 | 4349 // When scanning the RS, we only care about objs in CS. |
4350 if (barrier == G1BarrierRS) { | |
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4351 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
342 | 4352 } |
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4353 } else { |
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4354 // The object is not in collection set. If we're a root scanning |
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4355 // closure during an initial mark pause (i.e. do_mark_object will |
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4356 // be true) then attempt to mark the object. |
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4357 if (do_mark_object) { |
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4358 mark_object(p); |
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4359 } |
526 | 4360 } |
4361 | |
4362 if (barrier == G1BarrierEvac && obj != NULL) { | |
616
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4363 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
526 | 4364 } |
4365 | |
4366 if (do_gen_barrier && obj != NULL) { | |
4367 par_do_barrier(p); | |
4368 } | |
4369 } | |
4370 | |
1261
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4371 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(oop* p); |
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4372 template void G1ParCopyClosure<false, G1BarrierEvac, false>::do_oop_work(narrowOop* p); |
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4373 |
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4374 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
526 | 4375 assert(has_partial_array_mask(p), "invariant"); |
4376 oop old = clear_partial_array_mask(p); | |
342 | 4377 assert(old->is_objArray(), "must be obj array"); |
4378 assert(old->is_forwarded(), "must be forwarded"); | |
4379 assert(Universe::heap()->is_in_reserved(old), "must be in heap."); | |
4380 | |
4381 objArrayOop obj = objArrayOop(old->forwardee()); | |
4382 assert((void*)old != (void*)old->forwardee(), "self forwarding here?"); | |
4383 // Process ParGCArrayScanChunk elements now | |
4384 // and push the remainder back onto queue | |
4385 int start = arrayOop(old)->length(); | |
4386 int end = obj->length(); | |
4387 int remainder = end - start; | |
4388 assert(start <= end, "just checking"); | |
4389 if (remainder > 2 * ParGCArrayScanChunk) { | |
4390 // Test above combines last partial chunk with a full chunk | |
4391 end = start + ParGCArrayScanChunk; | |
4392 arrayOop(old)->set_length(end); | |
4393 // Push remainder. | |
845
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4394 oop* old_p = set_partial_array_mask(old); |
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4395 assert(arrayOop(old)->length() < obj->length(), "Empty push?"); |
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4396 _par_scan_state->push_on_queue(old_p); |
342 | 4397 } else { |
4398 // Restore length so that the heap remains parsable in | |
4399 // case of evacuation failure. | |
4400 arrayOop(old)->set_length(end); | |
4401 } | |
845
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4402 _scanner.set_region(_g1->heap_region_containing_raw(obj)); |
342 | 4403 // process our set of indices (include header in first chunk) |
845
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4404 obj->oop_iterate_range(&_scanner, start, end); |
342 | 4405 } |
4406 | |
4407 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
4408 protected: | |
4409 G1CollectedHeap* _g1h; | |
4410 G1ParScanThreadState* _par_scan_state; | |
4411 RefToScanQueueSet* _queues; | |
4412 ParallelTaskTerminator* _terminator; | |
4413 | |
4414 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
4415 RefToScanQueueSet* queues() { return _queues; } | |
4416 ParallelTaskTerminator* terminator() { return _terminator; } | |
4417 | |
4418 public: | |
4419 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
4420 G1ParScanThreadState* par_scan_state, | |
4421 RefToScanQueueSet* queues, | |
4422 ParallelTaskTerminator* terminator) | |
4423 : _g1h(g1h), _par_scan_state(par_scan_state), | |
4424 _queues(queues), _terminator(terminator) {} | |
4425 | |
1862
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4426 void do_void(); |
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4427 |
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4428 private: |
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4429 inline bool offer_termination(); |
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4430 }; |
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4431 |
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4432 bool G1ParEvacuateFollowersClosure::offer_termination() { |
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4433 G1ParScanThreadState* const pss = par_scan_state(); |
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4434 pss->start_term_time(); |
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4435 const bool res = terminator()->offer_termination(); |
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4436 pss->end_term_time(); |
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4437 return res; |
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|
4438 } |
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4439 |
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4440 void G1ParEvacuateFollowersClosure::do_void() { |
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4441 StarTask stolen_task; |
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4442 G1ParScanThreadState* const pss = par_scan_state(); |
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4443 pss->trim_queue(); |
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|
4444 |
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4445 do { |
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4446 while (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
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4447 assert(pss->verify_task(stolen_task), "sanity"); |
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4448 if (stolen_task.is_narrow()) { |
1883
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4449 pss->deal_with_reference((narrowOop*) stolen_task); |
1862
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4450 } else { |
1883
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|
4451 pss->deal_with_reference((oop*) stolen_task); |
1862
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4452 } |
1883
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|
4453 |
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4454 // We've just processed a reference and we might have made |
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4455 // available new entries on the queues. So we have to make sure |
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|
4456 // we drain the queues as necessary. |
342 | 4457 pss->trim_queue(); |
4458 } | |
1862
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4459 } while (!offer_termination()); |
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|
4460 |
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4461 pss->retire_alloc_buffers(); |
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4462 } |
342 | 4463 |
4464 class G1ParTask : public AbstractGangTask { | |
4465 protected: | |
4466 G1CollectedHeap* _g1h; | |
4467 RefToScanQueueSet *_queues; | |
4468 ParallelTaskTerminator _terminator; | |
845
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4469 int _n_workers; |
342 | 4470 |
4471 Mutex _stats_lock; | |
4472 Mutex* stats_lock() { return &_stats_lock; } | |
4473 | |
4474 size_t getNCards() { | |
4475 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
4476 / G1BlockOffsetSharedArray::N_bytes; | |
4477 } | |
4478 | |
4479 public: | |
4480 G1ParTask(G1CollectedHeap* g1h, int workers, RefToScanQueueSet *task_queues) | |
4481 : AbstractGangTask("G1 collection"), | |
4482 _g1h(g1h), | |
4483 _queues(task_queues), | |
4484 _terminator(workers, _queues), | |
845
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4485 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true), |
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4486 _n_workers(workers) |
342 | 4487 {} |
4488 | |
4489 RefToScanQueueSet* queues() { return _queues; } | |
4490 | |
4491 RefToScanQueue *work_queue(int i) { | |
4492 return queues()->queue(i); | |
4493 } | |
4494 | |
4495 void work(int i) { | |
845
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4496 if (i >= _n_workers) return; // no work needed this round |
1611 | 4497 |
4498 double start_time_ms = os::elapsedTime() * 1000.0; | |
4499 _g1h->g1_policy()->record_gc_worker_start_time(i, start_time_ms); | |
4500 | |
342 | 4501 ResourceMark rm; |
4502 HandleMark hm; | |
4503 | |
526 | 4504 G1ParScanThreadState pss(_g1h, i); |
4505 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss); | |
4506 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss); | |
4507 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss); | |
342 | 4508 |
4509 pss.set_evac_closure(&scan_evac_cl); | |
4510 pss.set_evac_failure_closure(&evac_failure_cl); | |
4511 pss.set_partial_scan_closure(&partial_scan_cl); | |
4512 | |
4513 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss); | |
4514 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss); | |
4515 G1ParScanHeapRSClosure only_scan_heap_rs_cl(_g1h, &pss); | |
1261
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4516 G1ParPushHeapRSClosure push_heap_rs_cl(_g1h, &pss); |
616
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4517 |
342 | 4518 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss); |
4519 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss); | |
4520 G1ParScanAndMarkHeapRSClosure scan_mark_heap_rs_cl(_g1h, &pss); | |
4521 | |
4522 OopsInHeapRegionClosure *scan_root_cl; | |
4523 OopsInHeapRegionClosure *scan_perm_cl; | |
4524 | |
1359
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6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
4525 if (_g1h->g1_policy()->during_initial_mark_pause()) { |
342 | 4526 scan_root_cl = &scan_mark_root_cl; |
4527 scan_perm_cl = &scan_mark_perm_cl; | |
4528 } else { | |
4529 scan_root_cl = &only_scan_root_cl; | |
4530 scan_perm_cl = &only_scan_perm_cl; | |
4531 } | |
4532 | |
4533 pss.start_strong_roots(); | |
4534 _g1h->g1_process_strong_roots(/* not collecting perm */ false, | |
4535 SharedHeap::SO_AllClasses, | |
4536 scan_root_cl, | |
1261
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|
4537 &push_heap_rs_cl, |
342 | 4538 scan_perm_cl, |
4539 i); | |
4540 pss.end_strong_roots(); | |
3823
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4541 |
342 | 4542 { |
4543 double start = os::elapsedTime(); | |
4544 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); | |
4545 evac.do_void(); | |
4546 double elapsed_ms = (os::elapsedTime()-start)*1000.0; | |
4547 double term_ms = pss.term_time()*1000.0; | |
4548 _g1h->g1_policy()->record_obj_copy_time(i, elapsed_ms-term_ms); | |
1611 | 4549 _g1h->g1_policy()->record_termination(i, term_ms, pss.term_attempts()); |
342 | 4550 } |
1282 | 4551 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
342 | 4552 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
4553 | |
4554 // Clean up any par-expanded rem sets. | |
4555 HeapRegionRemSet::par_cleanup(); | |
4556 | |
4557 if (ParallelGCVerbose) { | |
1709 | 4558 MutexLocker x(stats_lock()); |
4559 pss.print_termination_stats(i); | |
342 | 4560 } |
4561 | |
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4562 assert(pss.refs()->is_empty(), "should be empty"); |
1611 | 4563 double end_time_ms = os::elapsedTime() * 1000.0; |
4564 _g1h->g1_policy()->record_gc_worker_end_time(i, end_time_ms); | |
342 | 4565 } |
4566 }; | |
4567 | |
4568 // *** Common G1 Evacuation Stuff | |
4569 | |
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4570 // This method is run in a GC worker. |
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4571 |
342 | 4572 void |
4573 G1CollectedHeap:: | |
4574 g1_process_strong_roots(bool collecting_perm_gen, | |
4575 SharedHeap::ScanningOption so, | |
4576 OopClosure* scan_non_heap_roots, | |
4577 OopsInHeapRegionClosure* scan_rs, | |
4578 OopsInGenClosure* scan_perm, | |
4579 int worker_i) { | |
4580 // First scan the strong roots, including the perm gen. | |
4581 double ext_roots_start = os::elapsedTime(); | |
4582 double closure_app_time_sec = 0.0; | |
4583 | |
4584 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
4585 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
4586 buf_scan_perm.set_generation(perm_gen()); | |
4587 | |
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4588 // Walk the code cache w/o buffering, because StarTask cannot handle |
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|
4589 // unaligned oop locations. |
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changeset
|
4590 CodeBlobToOopClosure eager_scan_code_roots(scan_non_heap_roots, /*do_marking=*/ true); |
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|
4591 |
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|
4592 process_strong_roots(false, // no scoping; this is parallel code |
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|
4593 collecting_perm_gen, so, |
342 | 4594 &buf_scan_non_heap_roots, |
989
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|
4595 &eager_scan_code_roots, |
342 | 4596 &buf_scan_perm); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
4597 |
3823
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|
4598 // Now the ref_processor roots. |
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|
4599 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { |
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|
4600 // We need to treat the discovered reference lists as roots and |
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diff
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|
4601 // keep entries (which are added by the marking threads) on them |
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|
4602 // live until they can be processed at the end of marking. |
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changeset
|
4603 ref_processor()->weak_oops_do(&buf_scan_non_heap_roots); |
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7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
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3778
diff
changeset
|
4604 } |
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
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3778
diff
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|
4605 |
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7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
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diff
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|
4606 // Finish up any enqueued closure apps (attributed as object copy time). |
342 | 4607 buf_scan_non_heap_roots.done(); |
4608 buf_scan_perm.done(); | |
3823
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7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
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parents:
3778
diff
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|
4609 |
342 | 4610 double ext_roots_end = os::elapsedTime(); |
3823
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7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
parents:
3778
diff
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|
4611 |
342 | 4612 g1_policy()->reset_obj_copy_time(worker_i); |
3823
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
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parents:
3778
diff
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|
4613 double obj_copy_time_sec = buf_scan_perm.closure_app_seconds() + |
14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
johnc
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3778
diff
changeset
|
4614 buf_scan_non_heap_roots.closure_app_seconds(); |
342 | 4615 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); |
3823
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7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
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diff
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|
4616 |
342 | 4617 double ext_root_time_ms = |
4618 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
3823
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7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
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diff
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|
4619 |
342 | 4620 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); |
4621 | |
4622 // Scan strong roots in mark stack. | |
4623 if (!_process_strong_tasks->is_task_claimed(G1H_PS_mark_stack_oops_do)) { | |
4624 concurrent_mark()->oops_do(scan_non_heap_roots); | |
4625 } | |
4626 double mark_stack_scan_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; | |
4627 g1_policy()->record_mark_stack_scan_time(worker_i, mark_stack_scan_ms); | |
4628 | |
4629 // Now scan the complement of the collection set. | |
4630 if (scan_rs != NULL) { | |
4631 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
4632 } | |
3823
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diff
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|
4633 |
342 | 4634 _process_strong_tasks->all_tasks_completed(); |
4635 } | |
4636 | |
4637 void | |
4638 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
4639 OopClosure* non_root_closure) { | |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
890
diff
changeset
|
4640 CodeBlobToOopClosure roots_in_blobs(root_closure, /*do_marking=*/ false); |
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
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diff
changeset
|
4641 SharedHeap::process_weak_roots(root_closure, &roots_in_blobs, non_root_closure); |
342 | 4642 } |
4643 | |
4644 void G1CollectedHeap::evacuate_collection_set() { | |
4645 set_evacuation_failed(false); | |
4646 | |
4647 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
4648 concurrent_g1_refine()->set_use_cache(false); | |
889 | 4649 concurrent_g1_refine()->clear_hot_cache_claimed_index(); |
4650 | |
342 | 4651 int n_workers = (ParallelGCThreads > 0 ? workers()->total_workers() : 1); |
4652 set_par_threads(n_workers); | |
4653 G1ParTask g1_par_task(this, n_workers, _task_queues); | |
4654 | |
4655 init_for_evac_failure(NULL); | |
4656 | |
4657 rem_set()->prepare_for_younger_refs_iterate(true); | |
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
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parents:
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|
4658 |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
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parents:
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diff
changeset
|
4659 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
342 | 4660 double start_par = os::elapsedTime(); |
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1755
diff
changeset
|
4661 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 4662 // The individual threads will set their evac-failure closures. |
989
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6863023: need non-perm oops in code cache for JSR 292
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parents:
890
diff
changeset
|
4663 StrongRootsScope srs(this); |
1709 | 4664 if (ParallelGCVerbose) G1ParScanThreadState::print_termination_stats_hdr(); |
342 | 4665 workers()->run_task(&g1_par_task); |
4666 } else { | |
989
148e5441d916
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jrose
parents:
890
diff
changeset
|
4667 StrongRootsScope srs(this); |
342 | 4668 g1_par_task.work(0); |
4669 } | |
4670 | |
4671 double par_time = (os::elapsedTime() - start_par) * 1000.0; | |
4672 g1_policy()->record_par_time(par_time); | |
4673 set_par_threads(0); | |
1974
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
4674 |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
4675 // Weak root processing. |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
1973
diff
changeset
|
4676 // Note: when JSR 292 is enabled and code blobs can contain |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
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diff
changeset
|
4677 // non-perm oops then we will need to process the code blobs |
fd1d227ef1b9
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
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diff
changeset
|
4678 // here too. |
342 | 4679 { |
4680 G1IsAliveClosure is_alive(this); | |
4681 G1KeepAliveClosure keep_alive(this); | |
4682 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
4683 } | |
3830
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7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
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3824
diff
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|
4684 release_gc_alloc_regions(); |
342 | 4685 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); |
616
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diff
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|
4686 |
889 | 4687 concurrent_g1_refine()->clear_hot_cache(); |
342 | 4688 concurrent_g1_refine()->set_use_cache(true); |
4689 | |
4690 finalize_for_evac_failure(); | |
4691 | |
4692 // Must do this before removing self-forwarding pointers, which clears | |
4693 // the per-region evac-failure flags. | |
4694 concurrent_mark()->complete_marking_in_collection_set(); | |
4695 | |
4696 if (evacuation_failed()) { | |
4697 remove_self_forwarding_pointers(); | |
4698 if (PrintGCDetails) { | |
1719
b63010841f78
6975964: G1: print out a more descriptive message for evacuation failure when +PrintGCDetails is set
tonyp
parents:
1718
diff
changeset
|
4699 gclog_or_tty->print(" (to-space overflow)"); |
342 | 4700 } else if (PrintGC) { |
4701 gclog_or_tty->print("--"); | |
4702 } | |
4703 } | |
4704 | |
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
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diff
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|
4705 if (G1DeferredRSUpdate) { |
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6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
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|
4706 RedirtyLoggedCardTableEntryFastClosure redirty; |
4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
595
diff
changeset
|
4707 dirty_card_queue_set().set_closure(&redirty); |
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6720309: G1: don't synchronously update RSet during evacuation pauses
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parents:
595
diff
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|
4708 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
1111 | 4709 |
4710 DirtyCardQueueSet& dcq = JavaThread::dirty_card_queue_set(); | |
4711 dcq.merge_bufferlists(&dirty_card_queue_set()); | |
616
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595
diff
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|
4712 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
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diff
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|
4713 } |
342 | 4714 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
4715 } | |
4716 | |
2173 | 4717 void G1CollectedHeap::free_region_if_empty(HeapRegion* hr, |
2152 | 4718 size_t* pre_used, |
4719 FreeRegionList* free_list, | |
4720 HumongousRegionSet* humongous_proxy_set, | |
2173 | 4721 HRRSCleanupTask* hrrs_cleanup_task, |
2152 | 4722 bool par) { |
4723 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { | |
4724 if (hr->isHumongous()) { | |
4725 assert(hr->startsHumongous(), "we should only see starts humongous"); | |
4726 free_humongous_region(hr, pre_used, free_list, humongous_proxy_set, par); | |
4727 } else { | |
4728 free_region(hr, pre_used, free_list, par); | |
342 | 4729 } |
2173 | 4730 } else { |
4731 hr->rem_set()->do_cleanup_work(hrrs_cleanup_task); | |
342 | 4732 } |
4733 } | |
4734 | |
2152 | 4735 void G1CollectedHeap::free_region(HeapRegion* hr, |
4736 size_t* pre_used, | |
4737 FreeRegionList* free_list, | |
4738 bool par) { | |
4739 assert(!hr->isHumongous(), "this is only for non-humongous regions"); | |
4740 assert(!hr->is_empty(), "the region should not be empty"); | |
4741 assert(free_list != NULL, "pre-condition"); | |
4742 | |
4743 *pre_used += hr->used(); | |
4744 hr->hr_clear(par, true /* clear_space */); | |
2432
455328d90876
7029458: G1: Add newly-reclaimed regions to the beginning of the region free list, not the end
tonyp
parents:
2369
diff
changeset
|
4745 free_list->add_as_head(hr); |
2152 | 4746 } |
4747 | |
4748 void G1CollectedHeap::free_humongous_region(HeapRegion* hr, | |
4749 size_t* pre_used, | |
4750 FreeRegionList* free_list, | |
4751 HumongousRegionSet* humongous_proxy_set, | |
4752 bool par) { | |
4753 assert(hr->startsHumongous(), "this is only for starts humongous regions"); | |
4754 assert(free_list != NULL, "pre-condition"); | |
4755 assert(humongous_proxy_set != NULL, "pre-condition"); | |
4756 | |
4757 size_t hr_used = hr->used(); | |
4758 size_t hr_capacity = hr->capacity(); | |
4759 size_t hr_pre_used = 0; | |
4760 _humongous_set.remove_with_proxy(hr, humongous_proxy_set); | |
4761 hr->set_notHumongous(); | |
4762 free_region(hr, &hr_pre_used, free_list, par); | |
4763 | |
3766 | 4764 size_t i = hr->hrs_index() + 1; |
2152 | 4765 size_t num = 1; |
3766 | 4766 while (i < n_regions()) { |
4767 HeapRegion* curr_hr = region_at(i); | |
2152 | 4768 if (!curr_hr->continuesHumongous()) { |
4769 break; | |
4770 } | |
4771 curr_hr->set_notHumongous(); | |
4772 free_region(curr_hr, &hr_pre_used, free_list, par); | |
4773 num += 1; | |
4774 i += 1; | |
4775 } | |
4776 assert(hr_pre_used == hr_used, | |
4777 err_msg("hr_pre_used: "SIZE_FORMAT" and hr_used: "SIZE_FORMAT" " | |
4778 "should be the same", hr_pre_used, hr_used)); | |
4779 *pre_used += hr_pre_used; | |
4780 } | |
4781 | |
4782 void G1CollectedHeap::update_sets_after_freeing_regions(size_t pre_used, | |
4783 FreeRegionList* free_list, | |
4784 HumongousRegionSet* humongous_proxy_set, | |
4785 bool par) { | |
4786 if (pre_used > 0) { | |
4787 Mutex* lock = (par) ? ParGCRareEvent_lock : NULL; | |
342 | 4788 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); |
2152 | 4789 assert(_summary_bytes_used >= pre_used, |
4790 err_msg("invariant: _summary_bytes_used: "SIZE_FORMAT" " | |
4791 "should be >= pre_used: "SIZE_FORMAT, | |
4792 _summary_bytes_used, pre_used)); | |
342 | 4793 _summary_bytes_used -= pre_used; |
2152 | 4794 } |
4795 if (free_list != NULL && !free_list->is_empty()) { | |
4796 MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag); | |
2432
455328d90876
7029458: G1: Add newly-reclaimed regions to the beginning of the region free list, not the end
tonyp
parents:
2369
diff
changeset
|
4797 _free_list.add_as_head(free_list); |
2152 | 4798 } |
4799 if (humongous_proxy_set != NULL && !humongous_proxy_set->is_empty()) { | |
4800 MutexLockerEx x(OldSets_lock, Mutex::_no_safepoint_check_flag); | |
4801 _humongous_set.update_from_proxy(humongous_proxy_set); | |
342 | 4802 } |
4803 } | |
4804 | |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
4805 class G1ParCleanupCTTask : public AbstractGangTask { |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
4806 CardTableModRefBS* _ct_bs; |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
4807 G1CollectedHeap* _g1h; |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
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|
4808 HeapRegion* volatile _su_head; |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
4809 public: |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
4810 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4811 G1CollectedHeap* g1h) : |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
4812 AbstractGangTask("G1 Par Cleanup CT Task"), |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4813 _ct_bs(ct_bs), _g1h(g1h) { } |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
4814 |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
4815 void work(int i) { |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
4816 HeapRegion* r; |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
4817 while (r = _g1h->pop_dirty_cards_region()) { |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
4818 clear_cards(r); |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
4819 } |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
4820 } |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
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936
diff
changeset
|
4821 |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
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|
4822 void clear_cards(HeapRegion* r) { |
3830
f44782f04dd4
7039627: G1: avoid BOT updates for survivor allocations and dirty survivor regions incrementally
tonyp
parents:
3824
diff
changeset
|
4823 // Cards of the survivors should have already been dirtied. |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
4824 if (!r->is_survivor()) { |
796
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
794
diff
changeset
|
4825 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
changeset
|
4826 } |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
changeset
|
4827 } |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
apetrusenko
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794
diff
changeset
|
4828 }; |
29e7d79232b9
6819065: G1: eliminate high serial card table clearing time
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794
diff
changeset
|
4829 |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
4830 #ifndef PRODUCT |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
4831 class G1VerifyCardTableCleanup: public HeapRegionClosure { |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
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3293
diff
changeset
|
4832 G1CollectedHeap* _g1h; |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
4833 CardTableModRefBS* _ct_bs; |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
4834 public: |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
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3293
diff
changeset
|
4835 G1VerifyCardTableCleanup(G1CollectedHeap* g1h, CardTableModRefBS* ct_bs) |
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
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3293
diff
changeset
|
4836 : _g1h(g1h), _ct_bs(ct_bs) { } |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
parents:
2432
diff
changeset
|
4837 virtual bool doHeapRegion(HeapRegion* r) { |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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1391
diff
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|
4838 if (r->is_survivor()) { |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
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3293
diff
changeset
|
4839 _g1h->verify_dirty_region(r); |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
4840 } else { |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
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3293
diff
changeset
|
4841 _g1h->verify_not_dirty_region(r); |
940
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
4842 } |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
parents:
936
diff
changeset
|
4843 return false; |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
apetrusenko
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936
diff
changeset
|
4844 } |
8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
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936
diff
changeset
|
4845 }; |
2433
abdfc822206f
7023069: G1: Introduce symmetric locking in the slow allocation path
tonyp
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2432
diff
changeset
|
4846 |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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3293
diff
changeset
|
4847 void G1CollectedHeap::verify_not_dirty_region(HeapRegion* hr) { |
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4848 // All of the region should be clean. |
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|
4849 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); |
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|
4850 MemRegion mr(hr->bottom(), hr->end()); |
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|
4851 ct_bs->verify_not_dirty_region(mr); |
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|
4852 } |
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|
4853 |
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|
4854 void G1CollectedHeap::verify_dirty_region(HeapRegion* hr) { |
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4855 // We cannot guarantee that [bottom(),end()] is dirty. Threads |
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4856 // dirty allocated blocks as they allocate them. The thread that |
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|
4857 // retires each region and replaces it with a new one will do a |
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4858 // maximal allocation to fill in [pre_dummy_top(),end()] but will |
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4859 // not dirty that area (one less thing to have to do while holding |
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4860 // a lock). So we can only verify that [bottom(),pre_dummy_top()] |
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4861 // is dirty. |
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4862 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
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|
4863 MemRegion mr(hr->bottom(), hr->pre_dummy_top()); |
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4864 ct_bs->verify_dirty_region(mr); |
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4865 } |
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|
4866 |
2433
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|
4867 void G1CollectedHeap::verify_dirty_young_list(HeapRegion* head) { |
3317
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4868 CardTableModRefBS* ct_bs = (CardTableModRefBS*) barrier_set(); |
2433
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4869 for (HeapRegion* hr = head; hr != NULL; hr = hr->get_next_young_region()) { |
3317
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4870 verify_dirty_region(hr); |
2433
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|
4871 } |
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|
4872 } |
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|
4873 |
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|
4874 void G1CollectedHeap::verify_dirty_young_regions() { |
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4875 verify_dirty_young_list(_young_list->first_region()); |
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4876 verify_dirty_young_list(_young_list->first_survivor_region()); |
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|
4877 } |
940
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|
4878 #endif |
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|
4879 |
342 | 4880 void G1CollectedHeap::cleanUpCardTable() { |
4881 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
4882 double start = os::elapsedTime(); | |
4883 | |
796
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4884 // Iterate over the dirty cards region list. |
3830
f44782f04dd4
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|
4885 G1ParCleanupCTTask cleanup_task(ct_bs, this); |
1394
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4886 |
796
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|
4887 if (ParallelGCThreads > 0) { |
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4888 set_par_threads(workers()->total_workers()); |
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|
4889 workers()->run_task(&cleanup_task); |
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|
4890 set_par_threads(0); |
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|
4891 } else { |
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|
4892 while (_dirty_cards_region_list) { |
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4893 HeapRegion* r = _dirty_cards_region_list; |
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|
4894 cleanup_task.clear_cards(r); |
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|
4895 _dirty_cards_region_list = r->get_next_dirty_cards_region(); |
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4896 if (_dirty_cards_region_list == r) { |
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|
4897 // The last region. |
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|
4898 _dirty_cards_region_list = NULL; |
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|
4899 } |
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|
4900 r->set_next_dirty_cards_region(NULL); |
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|
4901 } |
940
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|
4902 } |
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|
4903 |
342 | 4904 double elapsed = os::elapsedTime() - start; |
4905 g1_policy()->record_clear_ct_time( elapsed * 1000.0); | |
940
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|
4906 #ifndef PRODUCT |
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|
4907 if (G1VerifyCTCleanup || VerifyAfterGC) { |
3317
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|
4908 G1VerifyCardTableCleanup cleanup_verifier(this, ct_bs); |
940
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|
4909 heap_region_iterate(&cleanup_verifier); |
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|
4910 } |
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|
4911 #endif |
342 | 4912 } |
4913 | |
4914 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
2152 | 4915 size_t pre_used = 0; |
4916 FreeRegionList local_free_list("Local List for CSet Freeing"); | |
4917 | |
342 | 4918 double young_time_ms = 0.0; |
4919 double non_young_time_ms = 0.0; | |
4920 | |
1394
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4921 // Since the collection set is a superset of the the young list, |
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|
4922 // all we need to do to clear the young list is clear its |
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|
4923 // head and length, and unlink any young regions in the code below |
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|
4924 _young_list->clear(); |
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|
4925 |
342 | 4926 G1CollectorPolicy* policy = g1_policy(); |
4927 | |
4928 double start_sec = os::elapsedTime(); | |
4929 bool non_young = true; | |
4930 | |
4931 HeapRegion* cur = cs_head; | |
4932 int age_bound = -1; | |
4933 size_t rs_lengths = 0; | |
4934 | |
4935 while (cur != NULL) { | |
2361 | 4936 assert(!is_on_master_free_list(cur), "sanity"); |
2152 | 4937 |
342 | 4938 if (non_young) { |
4939 if (cur->is_young()) { | |
4940 double end_sec = os::elapsedTime(); | |
4941 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
4942 non_young_time_ms += elapsed_ms; | |
4943 | |
4944 start_sec = os::elapsedTime(); | |
4945 non_young = false; | |
4946 } | |
4947 } else { | |
2152 | 4948 double end_sec = os::elapsedTime(); |
4949 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
4950 young_time_ms += elapsed_ms; | |
4951 | |
4952 start_sec = os::elapsedTime(); | |
4953 non_young = true; | |
342 | 4954 } |
4955 | |
4956 rs_lengths += cur->rem_set()->occupied(); | |
4957 | |
4958 HeapRegion* next = cur->next_in_collection_set(); | |
4959 assert(cur->in_collection_set(), "bad CS"); | |
4960 cur->set_next_in_collection_set(NULL); | |
4961 cur->set_in_collection_set(false); | |
4962 | |
4963 if (cur->is_young()) { | |
4964 int index = cur->young_index_in_cset(); | |
4965 guarantee( index != -1, "invariant" ); | |
4966 guarantee( (size_t)index < policy->young_cset_length(), "invariant" ); | |
4967 size_t words_survived = _surviving_young_words[index]; | |
4968 cur->record_surv_words_in_group(words_survived); | |
1394
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|
4969 |
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|
4970 // At this point the we have 'popped' cur from the collection set |
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|
4971 // (linked via next_in_collection_set()) but it is still in the |
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|
4972 // young list (linked via next_young_region()). Clear the |
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|
4973 // _next_young_region field. |
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|
4974 cur->set_next_young_region(NULL); |
342 | 4975 } else { |
4976 int index = cur->young_index_in_cset(); | |
4977 guarantee( index == -1, "invariant" ); | |
4978 } | |
4979 | |
4980 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
4981 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
4982 "invariant" ); | |
4983 | |
4984 if (!cur->evacuation_failed()) { | |
4985 // And the region is empty. | |
2152 | 4986 assert(!cur->is_empty(), "Should not have empty regions in a CS."); |
4987 free_region(cur, &pre_used, &local_free_list, false /* par */); | |
342 | 4988 } else { |
4989 cur->uninstall_surv_rate_group(); | |
4990 if (cur->is_young()) | |
4991 cur->set_young_index_in_cset(-1); | |
4992 cur->set_not_young(); | |
4993 cur->set_evacuation_failed(false); | |
4994 } | |
4995 cur = next; | |
4996 } | |
4997 | |
4998 policy->record_max_rs_lengths(rs_lengths); | |
4999 policy->cset_regions_freed(); | |
5000 | |
5001 double end_sec = os::elapsedTime(); | |
5002 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
5003 if (non_young) | |
5004 non_young_time_ms += elapsed_ms; | |
5005 else | |
5006 young_time_ms += elapsed_ms; | |
5007 | |
2152 | 5008 update_sets_after_freeing_regions(pre_used, &local_free_list, |
5009 NULL /* humongous_proxy_set */, | |
5010 false /* par */); | |
342 | 5011 policy->record_young_free_cset_time_ms(young_time_ms); |
5012 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
5013 } | |
5014 | |
1394
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|
5015 // This routine is similar to the above but does not record |
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|
5016 // any policy statistics or update free lists; we are abandoning |
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|
5017 // the current incremental collection set in preparation of a |
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|
5018 // full collection. After the full GC we will start to build up |
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|
5019 // the incremental collection set again. |
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|
5020 // This is only called when we're doing a full collection |
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|
5021 // and is immediately followed by the tearing down of the young list. |
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|
5022 |
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|
5023 void G1CollectedHeap::abandon_collection_set(HeapRegion* cs_head) { |
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|
5024 HeapRegion* cur = cs_head; |
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|
5025 |
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|
5026 while (cur != NULL) { |
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|
5027 HeapRegion* next = cur->next_in_collection_set(); |
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|
5028 assert(cur->in_collection_set(), "bad CS"); |
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|
5029 cur->set_next_in_collection_set(NULL); |
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|
5030 cur->set_in_collection_set(false); |
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|
5031 cur->set_young_index_in_cset(-1); |
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|
5032 cur = next; |
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|
5033 } |
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|
5034 } |
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|
5035 |
2152 | 5036 void G1CollectedHeap::set_free_regions_coming() { |
5037 if (G1ConcRegionFreeingVerbose) { | |
5038 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
5039 "setting free regions coming"); | |
5040 } | |
5041 | |
5042 assert(!free_regions_coming(), "pre-condition"); | |
5043 _free_regions_coming = true; | |
342 | 5044 } |
5045 | |
2152 | 5046 void G1CollectedHeap::reset_free_regions_coming() { |
5047 { | |
5048 assert(free_regions_coming(), "pre-condition"); | |
5049 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
5050 _free_regions_coming = false; | |
5051 SecondaryFreeList_lock->notify_all(); | |
5052 } | |
5053 | |
5054 if (G1ConcRegionFreeingVerbose) { | |
5055 gclog_or_tty->print_cr("G1ConcRegionFreeing [cm thread] : " | |
5056 "reset free regions coming"); | |
342 | 5057 } |
5058 } | |
5059 | |
2152 | 5060 void G1CollectedHeap::wait_while_free_regions_coming() { |
5061 // Most of the time we won't have to wait, so let's do a quick test | |
5062 // first before we take the lock. | |
5063 if (!free_regions_coming()) { | |
5064 return; | |
5065 } | |
5066 | |
5067 if (G1ConcRegionFreeingVerbose) { | |
5068 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
5069 "waiting for free regions"); | |
342 | 5070 } |
5071 | |
5072 { | |
2152 | 5073 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); |
5074 while (free_regions_coming()) { | |
5075 SecondaryFreeList_lock->wait(Mutex::_no_safepoint_check_flag); | |
342 | 5076 } |
2152 | 5077 } |
5078 | |
5079 if (G1ConcRegionFreeingVerbose) { | |
5080 gclog_or_tty->print_cr("G1ConcRegionFreeing [other] : " | |
5081 "done waiting for free regions"); | |
5082 } | |
342 | 5083 } |
5084 | |
5085 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
5086 assert(heap_lock_held_for_gc(), | |
5087 "the heap lock should already be held by or for this thread"); | |
5088 _young_list->push_region(hr); | |
5089 g1_policy()->set_region_short_lived(hr); | |
5090 } | |
5091 | |
5092 class NoYoungRegionsClosure: public HeapRegionClosure { | |
5093 private: | |
5094 bool _success; | |
5095 public: | |
5096 NoYoungRegionsClosure() : _success(true) { } | |
5097 bool doHeapRegion(HeapRegion* r) { | |
5098 if (r->is_young()) { | |
5099 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
5100 r->bottom(), r->end()); | |
5101 _success = false; | |
5102 } | |
5103 return false; | |
5104 } | |
5105 bool success() { return _success; } | |
5106 }; | |
5107 | |
1394
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5108 bool G1CollectedHeap::check_young_list_empty(bool check_heap, bool check_sample) { |
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5109 bool ret = _young_list->check_list_empty(check_sample); |
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5110 |
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5111 if (check_heap) { |
342 | 5112 NoYoungRegionsClosure closure; |
5113 heap_region_iterate(&closure); | |
5114 ret = ret && closure.success(); | |
5115 } | |
5116 | |
5117 return ret; | |
5118 } | |
5119 | |
5120 void G1CollectedHeap::empty_young_list() { | |
5121 assert(heap_lock_held_for_gc(), | |
5122 "the heap lock should already be held by or for this thread"); | |
5123 | |
5124 _young_list->empty_list(); | |
5125 } | |
5126 | |
5127 // Done at the start of full GC. | |
5128 void G1CollectedHeap::tear_down_region_lists() { | |
2152 | 5129 _free_list.remove_all(); |
342 | 5130 } |
5131 | |
5132 class RegionResetter: public HeapRegionClosure { | |
2152 | 5133 G1CollectedHeap* _g1h; |
5134 FreeRegionList _local_free_list; | |
5135 | |
342 | 5136 public: |
2152 | 5137 RegionResetter() : _g1h(G1CollectedHeap::heap()), |
5138 _local_free_list("Local Free List for RegionResetter") { } | |
5139 | |
342 | 5140 bool doHeapRegion(HeapRegion* r) { |
5141 if (r->continuesHumongous()) return false; | |
5142 if (r->top() > r->bottom()) { | |
5143 if (r->top() < r->end()) { | |
5144 Copy::fill_to_words(r->top(), | |
5145 pointer_delta(r->end(), r->top())); | |
5146 } | |
5147 } else { | |
5148 assert(r->is_empty(), "tautology"); | |
2152 | 5149 _local_free_list.add_as_tail(r); |
342 | 5150 } |
5151 return false; | |
5152 } | |
5153 | |
2152 | 5154 void update_free_lists() { |
5155 _g1h->update_sets_after_freeing_regions(0, &_local_free_list, NULL, | |
5156 false /* par */); | |
5157 } | |
342 | 5158 }; |
5159 | |
5160 // Done at the end of full GC. | |
5161 void G1CollectedHeap::rebuild_region_lists() { | |
5162 // This needs to go at the end of the full GC. | |
5163 RegionResetter rs; | |
5164 heap_region_iterate(&rs); | |
2152 | 5165 rs.update_free_lists(); |
342 | 5166 } |
5167 | |
5168 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
5169 _refine_cte_cl->set_concurrent(concurrent); | |
5170 } | |
5171 | |
5172 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
5173 HeapRegion* hr = heap_region_containing(p); | |
5174 if (hr == NULL) { | |
5175 return is_in_permanent(p); | |
5176 } else { | |
5177 return hr->is_in(p); | |
5178 } | |
5179 } | |
2152 | 5180 |
3830
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5181 // Methods for the mutator alloc region |
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5182 |
2433
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5183 HeapRegion* G1CollectedHeap::new_mutator_alloc_region(size_t word_size, |
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5184 bool force) { |
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|
5185 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
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5186 assert(!force || g1_policy()->can_expand_young_list(), |
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5187 "if force is true we should be able to expand the young list"); |
3778
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5188 bool young_list_full = g1_policy()->is_young_list_full(); |
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5189 if (force || !young_list_full) { |
2433
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5190 HeapRegion* new_alloc_region = new_region(word_size, |
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5191 false /* do_expand */); |
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5192 if (new_alloc_region != NULL) { |
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5193 g1_policy()->update_region_num(true /* next_is_young */); |
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5194 set_region_short_lived_locked(new_alloc_region); |
3778
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|
5195 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Eden, young_list_full); |
3289
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|
5196 g1mm()->update_eden_counters(); |
2433
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5197 return new_alloc_region; |
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|
5198 } |
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|
5199 } |
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|
5200 return NULL; |
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|
5201 } |
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|
5202 |
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5203 void G1CollectedHeap::retire_mutator_alloc_region(HeapRegion* alloc_region, |
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5204 size_t allocated_bytes) { |
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|
5205 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); |
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5206 assert(alloc_region->is_young(), "all mutator alloc regions should be young"); |
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|
5207 |
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|
5208 g1_policy()->add_region_to_incremental_cset_lhs(alloc_region); |
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5209 _summary_bytes_used += allocated_bytes; |
3778
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|
5210 _hr_printer.retire(alloc_region); |
2433
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|
5211 } |
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|
5212 |
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|
5213 HeapRegion* MutatorAllocRegion::allocate_new_region(size_t word_size, |
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|
5214 bool force) { |
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|
5215 return _g1h->new_mutator_alloc_region(word_size, force); |
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|
5216 } |
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|
5217 |
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|
5218 void MutatorAllocRegion::retire_region(HeapRegion* alloc_region, |
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|
5219 size_t allocated_bytes) { |
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|
5220 _g1h->retire_mutator_alloc_region(alloc_region, allocated_bytes); |
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|
5221 } |
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|
5222 |
3830
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|
5223 // Methods for the GC alloc regions |
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|
5224 |
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|
5225 HeapRegion* G1CollectedHeap::new_gc_alloc_region(size_t word_size, |
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|
5226 size_t count, |
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|
5227 GCAllocPurpose ap) { |
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|
5228 assert(FreeList_lock->owned_by_self(), "pre-condition"); |
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|
5229 |
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|
5230 if (count < g1_policy()->max_regions(ap)) { |
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|
5231 HeapRegion* new_alloc_region = new_region(word_size, |
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|
5232 true /* do_expand */); |
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|
5233 if (new_alloc_region != NULL) { |
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5234 // We really only need to do this for old regions given that we |
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5235 // should never scan survivors. But it doesn't hurt to do it |
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|
5236 // for survivors too. |
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|
5237 new_alloc_region->set_saved_mark(); |
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|
5238 if (ap == GCAllocForSurvived) { |
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|
5239 new_alloc_region->set_survivor(); |
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|
5240 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Survivor); |
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|
5241 } else { |
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|
5242 _hr_printer.alloc(new_alloc_region, G1HRPrinter::Old); |
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|
5243 } |
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|
5244 return new_alloc_region; |
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|
5245 } else { |
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|
5246 g1_policy()->note_alloc_region_limit_reached(ap); |
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|
5247 } |
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|
5248 } |
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|
5249 return NULL; |
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|
5250 } |
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|
5251 |
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|
5252 void G1CollectedHeap::retire_gc_alloc_region(HeapRegion* alloc_region, |
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|
5253 size_t allocated_bytes, |
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|
5254 GCAllocPurpose ap) { |
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|
5255 alloc_region->note_end_of_copying(); |
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|
5256 g1_policy()->record_bytes_copied_during_gc(allocated_bytes); |
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5257 if (ap == GCAllocForSurvived) { |
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|
5258 young_list()->add_survivor_region(alloc_region); |
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|
5259 } |
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|
5260 _hr_printer.retire(alloc_region); |
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|
5261 } |
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|
5262 |
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|
5263 HeapRegion* SurvivorGCAllocRegion::allocate_new_region(size_t word_size, |
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|
5264 bool force) { |
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|
5265 assert(!force, "not supported for GC alloc regions"); |
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|
5266 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForSurvived); |
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|
5267 } |
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|
5268 |
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|
5269 void SurvivorGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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|
5270 size_t allocated_bytes) { |
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|
5271 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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5272 GCAllocForSurvived); |
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5273 } |
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5274 |
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5275 HeapRegion* OldGCAllocRegion::allocate_new_region(size_t word_size, |
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5276 bool force) { |
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5277 assert(!force, "not supported for GC alloc regions"); |
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5278 return _g1h->new_gc_alloc_region(word_size, count(), GCAllocForTenured); |
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5279 } |
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5280 |
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5281 void OldGCAllocRegion::retire_region(HeapRegion* alloc_region, |
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5282 size_t allocated_bytes) { |
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5283 _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, |
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5284 GCAllocForTenured); |
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5285 } |
2433
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5286 // Heap region set verification |
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5287 |
2152 | 5288 class VerifyRegionListsClosure : public HeapRegionClosure { |
5289 private: | |
5290 HumongousRegionSet* _humongous_set; | |
5291 FreeRegionList* _free_list; | |
5292 size_t _region_count; | |
5293 | |
5294 public: | |
5295 VerifyRegionListsClosure(HumongousRegionSet* humongous_set, | |
5296 FreeRegionList* free_list) : | |
5297 _humongous_set(humongous_set), _free_list(free_list), | |
5298 _region_count(0) { } | |
5299 | |
5300 size_t region_count() { return _region_count; } | |
5301 | |
5302 bool doHeapRegion(HeapRegion* hr) { | |
5303 _region_count += 1; | |
5304 | |
5305 if (hr->continuesHumongous()) { | |
5306 return false; | |
5307 } | |
5308 | |
5309 if (hr->is_young()) { | |
5310 // TODO | |
5311 } else if (hr->startsHumongous()) { | |
5312 _humongous_set->verify_next_region(hr); | |
5313 } else if (hr->is_empty()) { | |
5314 _free_list->verify_next_region(hr); | |
5315 } | |
5316 return false; | |
5317 } | |
5318 }; | |
5319 | |
3766 | 5320 HeapRegion* G1CollectedHeap::new_heap_region(size_t hrs_index, |
5321 HeapWord* bottom) { | |
5322 HeapWord* end = bottom + HeapRegion::GrainWords; | |
5323 MemRegion mr(bottom, end); | |
5324 assert(_g1_reserved.contains(mr), "invariant"); | |
5325 // This might return NULL if the allocation fails | |
5326 return new HeapRegion(hrs_index, _bot_shared, mr, true /* is_zeroed */); | |
5327 } | |
5328 | |
2152 | 5329 void G1CollectedHeap::verify_region_sets() { |
5330 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */); | |
5331 | |
5332 // First, check the explicit lists. | |
5333 _free_list.verify(); | |
5334 { | |
5335 // Given that a concurrent operation might be adding regions to | |
5336 // the secondary free list we have to take the lock before | |
5337 // verifying it. | |
5338 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
5339 _secondary_free_list.verify(); | |
5340 } | |
5341 _humongous_set.verify(); | |
5342 | |
5343 // If a concurrent region freeing operation is in progress it will | |
5344 // be difficult to correctly attributed any free regions we come | |
5345 // across to the correct free list given that they might belong to | |
5346 // one of several (free_list, secondary_free_list, any local lists, | |
5347 // etc.). So, if that's the case we will skip the rest of the | |
5348 // verification operation. Alternatively, waiting for the concurrent | |
5349 // operation to complete will have a non-trivial effect on the GC's | |
5350 // operation (no concurrent operation will last longer than the | |
5351 // interval between two calls to verification) and it might hide | |
5352 // any issues that we would like to catch during testing. | |
5353 if (free_regions_coming()) { | |
5354 return; | |
5355 } | |
5356 | |
2361 | 5357 // Make sure we append the secondary_free_list on the free_list so |
5358 // that all free regions we will come across can be safely | |
5359 // attributed to the free_list. | |
5360 append_secondary_free_list_if_not_empty_with_lock(); | |
2152 | 5361 |
5362 // Finally, make sure that the region accounting in the lists is | |
5363 // consistent with what we see in the heap. | |
5364 _humongous_set.verify_start(); | |
5365 _free_list.verify_start(); | |
5366 | |
5367 VerifyRegionListsClosure cl(&_humongous_set, &_free_list); | |
5368 heap_region_iterate(&cl); | |
5369 | |
5370 _humongous_set.verify_end(); | |
5371 _free_list.verify_end(); | |
342 | 5372 } |