Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 940:8624da129f0b
6841313: G1: dirty cards of survivor regions in parallel
Reviewed-by: tonyp, iveresov
author | apetrusenko |
---|---|
date | Mon, 31 Aug 2009 05:27:29 -0700 |
parents | e1fdf4fd34dc |
children | 8b46c4d82093 |
rev | line source |
---|---|
342 | 1 /* |
579 | 2 * Copyright 2001-2009 Sun Microsystems, Inc. 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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_g1CollectedHeap.cpp.incl" | |
27 | |
28 // turn it on so that the contents of the young list (scan-only / | |
29 // to-be-collected) are printed at "strategic" points before / during | |
30 // / after the collection --- this is useful for debugging | |
31 #define SCAN_ONLY_VERBOSE 0 | |
32 // CURRENT STATUS | |
33 // This file is under construction. Search for "FIXME". | |
34 | |
35 // INVARIANTS/NOTES | |
36 // | |
37 // All allocation activity covered by the G1CollectedHeap interface is | |
38 // serialized by acquiring the HeapLock. This happens in | |
39 // mem_allocate_work, which all such allocation functions call. | |
40 // (Note that this does not apply to TLAB allocation, which is not part | |
41 // of this interface: it is done by clients of this interface.) | |
42 | |
43 // Local to this file. | |
44 | |
45 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
46 SuspendibleThreadSet* _sts; | |
47 G1RemSet* _g1rs; | |
48 ConcurrentG1Refine* _cg1r; | |
49 bool _concurrent; | |
50 public: | |
51 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
52 G1RemSet* g1rs, | |
53 ConcurrentG1Refine* cg1r) : | |
54 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
55 {} | |
56 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
57 _g1rs->concurrentRefineOneCard(card_ptr, worker_i); | |
58 if (_concurrent && _sts->should_yield()) { | |
59 // Caller will actually yield. | |
60 return false; | |
61 } | |
62 // Otherwise, we finished successfully; return true. | |
63 return true; | |
64 } | |
65 void set_concurrent(bool b) { _concurrent = b; } | |
66 }; | |
67 | |
68 | |
69 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
70 int _calls; | |
71 G1CollectedHeap* _g1h; | |
72 CardTableModRefBS* _ctbs; | |
73 int _histo[256]; | |
74 public: | |
75 ClearLoggedCardTableEntryClosure() : | |
76 _calls(0) | |
77 { | |
78 _g1h = G1CollectedHeap::heap(); | |
79 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
80 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
81 } | |
82 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
83 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
84 _calls++; | |
85 unsigned char* ujb = (unsigned char*)card_ptr; | |
86 int ind = (int)(*ujb); | |
87 _histo[ind]++; | |
88 *card_ptr = -1; | |
89 } | |
90 return true; | |
91 } | |
92 int calls() { return _calls; } | |
93 void print_histo() { | |
94 gclog_or_tty->print_cr("Card table value histogram:"); | |
95 for (int i = 0; i < 256; i++) { | |
96 if (_histo[i] != 0) { | |
97 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
98 } | |
99 } | |
100 } | |
101 }; | |
102 | |
103 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
104 int _calls; | |
105 G1CollectedHeap* _g1h; | |
106 CardTableModRefBS* _ctbs; | |
107 public: | |
108 RedirtyLoggedCardTableEntryClosure() : | |
109 _calls(0) | |
110 { | |
111 _g1h = G1CollectedHeap::heap(); | |
112 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
113 } | |
114 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
115 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
116 _calls++; | |
117 *card_ptr = 0; | |
118 } | |
119 return true; | |
120 } | |
121 int calls() { return _calls; } | |
122 }; | |
123 | |
616
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124 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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125 public: |
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126 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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127 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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128 return true; |
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129 } |
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130 }; |
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131 |
342 | 132 YoungList::YoungList(G1CollectedHeap* g1h) |
133 : _g1h(g1h), _head(NULL), | |
134 _scan_only_head(NULL), _scan_only_tail(NULL), _curr_scan_only(NULL), | |
135 _length(0), _scan_only_length(0), | |
136 _last_sampled_rs_lengths(0), | |
545 | 137 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) |
342 | 138 { |
139 guarantee( check_list_empty(false), "just making sure..." ); | |
140 } | |
141 | |
142 void YoungList::push_region(HeapRegion *hr) { | |
143 assert(!hr->is_young(), "should not already be young"); | |
144 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
145 | |
146 hr->set_next_young_region(_head); | |
147 _head = hr; | |
148 | |
149 hr->set_young(); | |
150 double yg_surv_rate = _g1h->g1_policy()->predict_yg_surv_rate((int)_length); | |
151 ++_length; | |
152 } | |
153 | |
154 void YoungList::add_survivor_region(HeapRegion* hr) { | |
545 | 155 assert(hr->is_survivor(), "should be flagged as survivor region"); |
342 | 156 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
157 | |
158 hr->set_next_young_region(_survivor_head); | |
159 if (_survivor_head == NULL) { | |
545 | 160 _survivor_tail = hr; |
342 | 161 } |
162 _survivor_head = hr; | |
163 | |
164 ++_survivor_length; | |
165 } | |
166 | |
167 HeapRegion* YoungList::pop_region() { | |
168 while (_head != NULL) { | |
169 assert( length() > 0, "list should not be empty" ); | |
170 HeapRegion* ret = _head; | |
171 _head = ret->get_next_young_region(); | |
172 ret->set_next_young_region(NULL); | |
173 --_length; | |
174 assert(ret->is_young(), "region should be very young"); | |
175 | |
176 // Replace 'Survivor' region type with 'Young'. So the region will | |
177 // be treated as a young region and will not be 'confused' with | |
178 // newly created survivor regions. | |
179 if (ret->is_survivor()) { | |
180 ret->set_young(); | |
181 } | |
182 | |
183 if (!ret->is_scan_only()) { | |
184 return ret; | |
185 } | |
186 | |
187 // scan-only, we'll add it to the scan-only list | |
188 if (_scan_only_tail == NULL) { | |
189 guarantee( _scan_only_head == NULL, "invariant" ); | |
190 | |
191 _scan_only_head = ret; | |
192 _curr_scan_only = ret; | |
193 } else { | |
194 guarantee( _scan_only_head != NULL, "invariant" ); | |
195 _scan_only_tail->set_next_young_region(ret); | |
196 } | |
197 guarantee( ret->get_next_young_region() == NULL, "invariant" ); | |
198 _scan_only_tail = ret; | |
199 | |
200 // no need to be tagged as scan-only any more | |
201 ret->set_young(); | |
202 | |
203 ++_scan_only_length; | |
204 } | |
205 assert( length() == 0, "list should be empty" ); | |
206 return NULL; | |
207 } | |
208 | |
209 void YoungList::empty_list(HeapRegion* list) { | |
210 while (list != NULL) { | |
211 HeapRegion* next = list->get_next_young_region(); | |
212 list->set_next_young_region(NULL); | |
213 list->uninstall_surv_rate_group(); | |
214 list->set_not_young(); | |
215 list = next; | |
216 } | |
217 } | |
218 | |
219 void YoungList::empty_list() { | |
220 assert(check_list_well_formed(), "young list should be well formed"); | |
221 | |
222 empty_list(_head); | |
223 _head = NULL; | |
224 _length = 0; | |
225 | |
226 empty_list(_scan_only_head); | |
227 _scan_only_head = NULL; | |
228 _scan_only_tail = NULL; | |
229 _scan_only_length = 0; | |
230 _curr_scan_only = NULL; | |
231 | |
232 empty_list(_survivor_head); | |
233 _survivor_head = NULL; | |
545 | 234 _survivor_tail = NULL; |
342 | 235 _survivor_length = 0; |
236 | |
237 _last_sampled_rs_lengths = 0; | |
238 | |
239 assert(check_list_empty(false), "just making sure..."); | |
240 } | |
241 | |
242 bool YoungList::check_list_well_formed() { | |
243 bool ret = true; | |
244 | |
245 size_t length = 0; | |
246 HeapRegion* curr = _head; | |
247 HeapRegion* last = NULL; | |
248 while (curr != NULL) { | |
249 if (!curr->is_young() || curr->is_scan_only()) { | |
250 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " | |
251 "incorrectly tagged (%d, %d)", | |
252 curr->bottom(), curr->end(), | |
253 curr->is_young(), curr->is_scan_only()); | |
254 ret = false; | |
255 } | |
256 ++length; | |
257 last = curr; | |
258 curr = curr->get_next_young_region(); | |
259 } | |
260 ret = ret && (length == _length); | |
261 | |
262 if (!ret) { | |
263 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
264 gclog_or_tty->print_cr("### list has %d entries, _length is %d", | |
265 length, _length); | |
266 } | |
267 | |
268 bool scan_only_ret = true; | |
269 length = 0; | |
270 curr = _scan_only_head; | |
271 last = NULL; | |
272 while (curr != NULL) { | |
273 if (!curr->is_young() || curr->is_scan_only()) { | |
274 gclog_or_tty->print_cr("### SCAN-ONLY REGION "PTR_FORMAT"-"PTR_FORMAT" " | |
275 "incorrectly tagged (%d, %d)", | |
276 curr->bottom(), curr->end(), | |
277 curr->is_young(), curr->is_scan_only()); | |
278 scan_only_ret = false; | |
279 } | |
280 ++length; | |
281 last = curr; | |
282 curr = curr->get_next_young_region(); | |
283 } | |
284 scan_only_ret = scan_only_ret && (length == _scan_only_length); | |
285 | |
286 if ( (last != _scan_only_tail) || | |
287 (_scan_only_head == NULL && _scan_only_tail != NULL) || | |
288 (_scan_only_head != NULL && _scan_only_tail == NULL) ) { | |
289 gclog_or_tty->print_cr("## _scan_only_tail is set incorrectly"); | |
290 scan_only_ret = false; | |
291 } | |
292 | |
293 if (_curr_scan_only != NULL && _curr_scan_only != _scan_only_head) { | |
294 gclog_or_tty->print_cr("### _curr_scan_only is set incorrectly"); | |
295 scan_only_ret = false; | |
296 } | |
297 | |
298 if (!scan_only_ret) { | |
299 gclog_or_tty->print_cr("### SCAN-ONLY LIST seems not well formed!"); | |
300 gclog_or_tty->print_cr("### list has %d entries, _scan_only_length is %d", | |
301 length, _scan_only_length); | |
302 } | |
303 | |
304 return ret && scan_only_ret; | |
305 } | |
306 | |
307 bool YoungList::check_list_empty(bool ignore_scan_only_list, | |
308 bool check_sample) { | |
309 bool ret = true; | |
310 | |
311 if (_length != 0) { | |
312 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %d", | |
313 _length); | |
314 ret = false; | |
315 } | |
316 if (check_sample && _last_sampled_rs_lengths != 0) { | |
317 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
318 ret = false; | |
319 } | |
320 if (_head != NULL) { | |
321 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
322 ret = false; | |
323 } | |
324 if (!ret) { | |
325 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
326 } | |
327 | |
328 if (ignore_scan_only_list) | |
329 return ret; | |
330 | |
331 bool scan_only_ret = true; | |
332 if (_scan_only_length != 0) { | |
333 gclog_or_tty->print_cr("### SCAN-ONLY LIST should have 0 length, not %d", | |
334 _scan_only_length); | |
335 scan_only_ret = false; | |
336 } | |
337 if (_scan_only_head != NULL) { | |
338 gclog_or_tty->print_cr("### SCAN-ONLY LIST does not have a NULL head"); | |
339 scan_only_ret = false; | |
340 } | |
341 if (_scan_only_tail != NULL) { | |
342 gclog_or_tty->print_cr("### SCAN-ONLY LIST does not have a NULL tail"); | |
343 scan_only_ret = false; | |
344 } | |
345 if (!scan_only_ret) { | |
346 gclog_or_tty->print_cr("### SCAN-ONLY LIST does not seem empty"); | |
347 } | |
348 | |
349 return ret && scan_only_ret; | |
350 } | |
351 | |
352 void | |
353 YoungList::rs_length_sampling_init() { | |
354 _sampled_rs_lengths = 0; | |
355 _curr = _head; | |
356 } | |
357 | |
358 bool | |
359 YoungList::rs_length_sampling_more() { | |
360 return _curr != NULL; | |
361 } | |
362 | |
363 void | |
364 YoungList::rs_length_sampling_next() { | |
365 assert( _curr != NULL, "invariant" ); | |
366 _sampled_rs_lengths += _curr->rem_set()->occupied(); | |
367 _curr = _curr->get_next_young_region(); | |
368 if (_curr == NULL) { | |
369 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
370 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
371 } | |
372 } | |
373 | |
374 void | |
375 YoungList::reset_auxilary_lists() { | |
376 // We could have just "moved" the scan-only list to the young list. | |
377 // However, the scan-only list is ordered according to the region | |
378 // age in descending order, so, by moving one entry at a time, we | |
379 // ensure that it is recreated in ascending order. | |
380 | |
381 guarantee( is_empty(), "young list should be empty" ); | |
382 assert(check_list_well_formed(), "young list should be well formed"); | |
383 | |
384 // Add survivor regions to SurvRateGroup. | |
385 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
545 | 386 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
342 | 387 for (HeapRegion* curr = _survivor_head; |
388 curr != NULL; | |
389 curr = curr->get_next_young_region()) { | |
390 _g1h->g1_policy()->set_region_survivors(curr); | |
391 } | |
392 _g1h->g1_policy()->note_stop_adding_survivor_regions(); | |
393 | |
394 if (_survivor_head != NULL) { | |
395 _head = _survivor_head; | |
396 _length = _survivor_length + _scan_only_length; | |
545 | 397 _survivor_tail->set_next_young_region(_scan_only_head); |
342 | 398 } else { |
399 _head = _scan_only_head; | |
400 _length = _scan_only_length; | |
401 } | |
402 | |
403 for (HeapRegion* curr = _scan_only_head; | |
404 curr != NULL; | |
405 curr = curr->get_next_young_region()) { | |
406 curr->recalculate_age_in_surv_rate_group(); | |
407 } | |
408 _scan_only_head = NULL; | |
409 _scan_only_tail = NULL; | |
410 _scan_only_length = 0; | |
411 _curr_scan_only = NULL; | |
412 | |
413 _survivor_head = NULL; | |
545 | 414 _survivor_tail = NULL; |
342 | 415 _survivor_length = 0; |
545 | 416 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
342 | 417 |
418 assert(check_list_well_formed(), "young list should be well formed"); | |
419 } | |
420 | |
421 void YoungList::print() { | |
422 HeapRegion* lists[] = {_head, _scan_only_head, _survivor_head}; | |
423 const char* names[] = {"YOUNG", "SCAN-ONLY", "SURVIVOR"}; | |
424 | |
425 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
426 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
427 HeapRegion *curr = lists[list]; | |
428 if (curr == NULL) | |
429 gclog_or_tty->print_cr(" empty"); | |
430 while (curr != NULL) { | |
431 gclog_or_tty->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " | |
432 "age: %4d, y: %d, s-o: %d, surv: %d", | |
433 curr->bottom(), curr->end(), | |
434 curr->top(), | |
435 curr->prev_top_at_mark_start(), | |
436 curr->next_top_at_mark_start(), | |
437 curr->top_at_conc_mark_count(), | |
438 curr->age_in_surv_rate_group_cond(), | |
439 curr->is_young(), | |
440 curr->is_scan_only(), | |
441 curr->is_survivor()); | |
442 curr = curr->get_next_young_region(); | |
443 } | |
444 } | |
445 | |
446 gclog_or_tty->print_cr(""); | |
447 } | |
448 | |
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449 void G1CollectedHeap::push_dirty_cards_region(HeapRegion* hr) |
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450 { |
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451 // Claim the right to put the region on the dirty cards region list |
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452 // by installing a self pointer. |
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453 HeapRegion* next = hr->get_next_dirty_cards_region(); |
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454 if (next == NULL) { |
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455 HeapRegion* res = (HeapRegion*) |
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456 Atomic::cmpxchg_ptr(hr, hr->next_dirty_cards_region_addr(), |
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457 NULL); |
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458 if (res == NULL) { |
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459 HeapRegion* head; |
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460 do { |
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461 // Put the region to the dirty cards region list. |
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462 head = _dirty_cards_region_list; |
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463 next = (HeapRegion*) |
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464 Atomic::cmpxchg_ptr(hr, &_dirty_cards_region_list, head); |
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465 if (next == head) { |
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466 assert(hr->get_next_dirty_cards_region() == hr, |
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467 "hr->get_next_dirty_cards_region() != hr"); |
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468 if (next == NULL) { |
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469 // The last region in the list points to itself. |
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470 hr->set_next_dirty_cards_region(hr); |
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471 } else { |
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472 hr->set_next_dirty_cards_region(next); |
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473 } |
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474 } |
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475 } while (next != head); |
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476 } |
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477 } |
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478 } |
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479 |
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480 HeapRegion* G1CollectedHeap::pop_dirty_cards_region() |
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481 { |
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482 HeapRegion* head; |
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483 HeapRegion* hr; |
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484 do { |
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485 head = _dirty_cards_region_list; |
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486 if (head == NULL) { |
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487 return NULL; |
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488 } |
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489 HeapRegion* new_head = head->get_next_dirty_cards_region(); |
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490 if (head == new_head) { |
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491 // The last region. |
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492 new_head = NULL; |
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493 } |
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494 hr = (HeapRegion*)Atomic::cmpxchg_ptr(new_head, &_dirty_cards_region_list, |
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495 head); |
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496 } while (hr != head); |
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497 assert(hr != NULL, "invariant"); |
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498 hr->set_next_dirty_cards_region(NULL); |
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499 return hr; |
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500 } |
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501 |
342 | 502 void G1CollectedHeap::stop_conc_gc_threads() { |
794 | 503 _cg1r->stop(); |
342 | 504 _czft->stop(); |
505 _cmThread->stop(); | |
506 } | |
507 | |
508 | |
509 void G1CollectedHeap::check_ct_logs_at_safepoint() { | |
510 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
511 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
512 | |
513 // Count the dirty cards at the start. | |
514 CountNonCleanMemRegionClosure count1(this); | |
515 ct_bs->mod_card_iterate(&count1); | |
516 int orig_count = count1.n(); | |
517 | |
518 // First clear the logged cards. | |
519 ClearLoggedCardTableEntryClosure clear; | |
520 dcqs.set_closure(&clear); | |
521 dcqs.apply_closure_to_all_completed_buffers(); | |
522 dcqs.iterate_closure_all_threads(false); | |
523 clear.print_histo(); | |
524 | |
525 // Now ensure that there's no dirty cards. | |
526 CountNonCleanMemRegionClosure count2(this); | |
527 ct_bs->mod_card_iterate(&count2); | |
528 if (count2.n() != 0) { | |
529 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
530 count2.n(), orig_count); | |
531 } | |
532 guarantee(count2.n() == 0, "Card table should be clean."); | |
533 | |
534 RedirtyLoggedCardTableEntryClosure redirty; | |
535 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
536 dcqs.apply_closure_to_all_completed_buffers(); | |
537 dcqs.iterate_closure_all_threads(false); | |
538 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
539 clear.calls(), orig_count); | |
540 guarantee(redirty.calls() == clear.calls(), | |
541 "Or else mechanism is broken."); | |
542 | |
543 CountNonCleanMemRegionClosure count3(this); | |
544 ct_bs->mod_card_iterate(&count3); | |
545 if (count3.n() != orig_count) { | |
546 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
547 orig_count, count3.n()); | |
548 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
549 } | |
550 | |
551 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
552 } | |
553 | |
554 // Private class members. | |
555 | |
556 G1CollectedHeap* G1CollectedHeap::_g1h; | |
557 | |
558 // Private methods. | |
559 | |
560 // Finds a HeapRegion that can be used to allocate a given size of block. | |
561 | |
562 | |
563 HeapRegion* G1CollectedHeap::newAllocRegion_work(size_t word_size, | |
564 bool do_expand, | |
565 bool zero_filled) { | |
566 ConcurrentZFThread::note_region_alloc(); | |
567 HeapRegion* res = alloc_free_region_from_lists(zero_filled); | |
568 if (res == NULL && do_expand) { | |
569 expand(word_size * HeapWordSize); | |
570 res = alloc_free_region_from_lists(zero_filled); | |
571 assert(res == NULL || | |
572 (!res->isHumongous() && | |
573 (!zero_filled || | |
574 res->zero_fill_state() == HeapRegion::Allocated)), | |
575 "Alloc Regions must be zero filled (and non-H)"); | |
576 } | |
577 if (res != NULL && res->is_empty()) _free_regions--; | |
578 assert(res == NULL || | |
579 (!res->isHumongous() && | |
580 (!zero_filled || | |
581 res->zero_fill_state() == HeapRegion::Allocated)), | |
582 "Non-young alloc Regions must be zero filled (and non-H)"); | |
583 | |
751 | 584 if (G1PrintRegions) { |
342 | 585 if (res != NULL) { |
586 gclog_or_tty->print_cr("new alloc region %d:["PTR_FORMAT", "PTR_FORMAT"], " | |
587 "top "PTR_FORMAT, | |
588 res->hrs_index(), res->bottom(), res->end(), res->top()); | |
589 } | |
590 } | |
591 | |
592 return res; | |
593 } | |
594 | |
595 HeapRegion* G1CollectedHeap::newAllocRegionWithExpansion(int purpose, | |
596 size_t word_size, | |
597 bool zero_filled) { | |
598 HeapRegion* alloc_region = NULL; | |
599 if (_gc_alloc_region_counts[purpose] < g1_policy()->max_regions(purpose)) { | |
600 alloc_region = newAllocRegion_work(word_size, true, zero_filled); | |
601 if (purpose == GCAllocForSurvived && alloc_region != NULL) { | |
545 | 602 alloc_region->set_survivor(); |
342 | 603 } |
604 ++_gc_alloc_region_counts[purpose]; | |
605 } else { | |
606 g1_policy()->note_alloc_region_limit_reached(purpose); | |
607 } | |
608 return alloc_region; | |
609 } | |
610 | |
611 // If could fit into free regions w/o expansion, try. | |
612 // Otherwise, if can expand, do so. | |
613 // Otherwise, if using ex regions might help, try with ex given back. | |
614 HeapWord* G1CollectedHeap::humongousObjAllocate(size_t word_size) { | |
615 assert(regions_accounted_for(), "Region leakage!"); | |
616 | |
617 // We can't allocate H regions while cleanupComplete is running, since | |
618 // some of the regions we find to be empty might not yet be added to the | |
619 // unclean list. (If we're already at a safepoint, this call is | |
620 // unnecessary, not to mention wrong.) | |
621 if (!SafepointSynchronize::is_at_safepoint()) | |
622 wait_for_cleanup_complete(); | |
623 | |
624 size_t num_regions = | |
625 round_to(word_size, HeapRegion::GrainWords) / HeapRegion::GrainWords; | |
626 | |
627 // Special case if < one region??? | |
628 | |
629 // Remember the ft size. | |
630 size_t x_size = expansion_regions(); | |
631 | |
632 HeapWord* res = NULL; | |
633 bool eliminated_allocated_from_lists = false; | |
634 | |
635 // Can the allocation potentially fit in the free regions? | |
636 if (free_regions() >= num_regions) { | |
637 res = _hrs->obj_allocate(word_size); | |
638 } | |
639 if (res == NULL) { | |
640 // Try expansion. | |
641 size_t fs = _hrs->free_suffix(); | |
642 if (fs + x_size >= num_regions) { | |
643 expand((num_regions - fs) * HeapRegion::GrainBytes); | |
644 res = _hrs->obj_allocate(word_size); | |
645 assert(res != NULL, "This should have worked."); | |
646 } else { | |
647 // Expansion won't help. Are there enough free regions if we get rid | |
648 // of reservations? | |
649 size_t avail = free_regions(); | |
650 if (avail >= num_regions) { | |
651 res = _hrs->obj_allocate(word_size); | |
652 if (res != NULL) { | |
653 remove_allocated_regions_from_lists(); | |
654 eliminated_allocated_from_lists = true; | |
655 } | |
656 } | |
657 } | |
658 } | |
659 if (res != NULL) { | |
660 // Increment by the number of regions allocated. | |
661 // FIXME: Assumes regions all of size GrainBytes. | |
662 #ifndef PRODUCT | |
663 mr_bs()->verify_clean_region(MemRegion(res, res + num_regions * | |
664 HeapRegion::GrainWords)); | |
665 #endif | |
666 if (!eliminated_allocated_from_lists) | |
667 remove_allocated_regions_from_lists(); | |
668 _summary_bytes_used += word_size * HeapWordSize; | |
669 _free_regions -= num_regions; | |
670 _num_humongous_regions += (int) num_regions; | |
671 } | |
672 assert(regions_accounted_for(), "Region Leakage"); | |
673 return res; | |
674 } | |
675 | |
676 HeapWord* | |
677 G1CollectedHeap::attempt_allocation_slow(size_t word_size, | |
678 bool permit_collection_pause) { | |
679 HeapWord* res = NULL; | |
680 HeapRegion* allocated_young_region = NULL; | |
681 | |
682 assert( SafepointSynchronize::is_at_safepoint() || | |
683 Heap_lock->owned_by_self(), "pre condition of the call" ); | |
684 | |
685 if (isHumongous(word_size)) { | |
686 // Allocation of a humongous object can, in a sense, complete a | |
687 // partial region, if the previous alloc was also humongous, and | |
688 // caused the test below to succeed. | |
689 if (permit_collection_pause) | |
690 do_collection_pause_if_appropriate(word_size); | |
691 res = humongousObjAllocate(word_size); | |
692 assert(_cur_alloc_region == NULL | |
693 || !_cur_alloc_region->isHumongous(), | |
694 "Prevent a regression of this bug."); | |
695 | |
696 } else { | |
354
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697 // We may have concurrent cleanup working at the time. Wait for it |
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698 // to complete. In the future we would probably want to make the |
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699 // concurrent cleanup truly concurrent by decoupling it from the |
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700 // allocation. |
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701 if (!SafepointSynchronize::is_at_safepoint()) |
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702 wait_for_cleanup_complete(); |
342 | 703 // If we do a collection pause, this will be reset to a non-NULL |
704 // value. If we don't, nulling here ensures that we allocate a new | |
705 // region below. | |
706 if (_cur_alloc_region != NULL) { | |
707 // We're finished with the _cur_alloc_region. | |
708 _summary_bytes_used += _cur_alloc_region->used(); | |
709 _cur_alloc_region = NULL; | |
710 } | |
711 assert(_cur_alloc_region == NULL, "Invariant."); | |
712 // Completion of a heap region is perhaps a good point at which to do | |
713 // a collection pause. | |
714 if (permit_collection_pause) | |
715 do_collection_pause_if_appropriate(word_size); | |
716 // Make sure we have an allocation region available. | |
717 if (_cur_alloc_region == NULL) { | |
718 if (!SafepointSynchronize::is_at_safepoint()) | |
719 wait_for_cleanup_complete(); | |
720 bool next_is_young = should_set_young_locked(); | |
721 // If the next region is not young, make sure it's zero-filled. | |
722 _cur_alloc_region = newAllocRegion(word_size, !next_is_young); | |
723 if (_cur_alloc_region != NULL) { | |
724 _summary_bytes_used -= _cur_alloc_region->used(); | |
725 if (next_is_young) { | |
726 set_region_short_lived_locked(_cur_alloc_region); | |
727 allocated_young_region = _cur_alloc_region; | |
728 } | |
729 } | |
730 } | |
731 assert(_cur_alloc_region == NULL || !_cur_alloc_region->isHumongous(), | |
732 "Prevent a regression of this bug."); | |
733 | |
734 // Now retry the allocation. | |
735 if (_cur_alloc_region != NULL) { | |
736 res = _cur_alloc_region->allocate(word_size); | |
737 } | |
738 } | |
739 | |
740 // NOTE: fails frequently in PRT | |
741 assert(regions_accounted_for(), "Region leakage!"); | |
742 | |
743 if (res != NULL) { | |
744 if (!SafepointSynchronize::is_at_safepoint()) { | |
745 assert( permit_collection_pause, "invariant" ); | |
746 assert( Heap_lock->owned_by_self(), "invariant" ); | |
747 Heap_lock->unlock(); | |
748 } | |
749 | |
750 if (allocated_young_region != NULL) { | |
751 HeapRegion* hr = allocated_young_region; | |
752 HeapWord* bottom = hr->bottom(); | |
753 HeapWord* end = hr->end(); | |
754 MemRegion mr(bottom, end); | |
755 ((CardTableModRefBS*)_g1h->barrier_set())->dirty(mr); | |
756 } | |
757 } | |
758 | |
759 assert( SafepointSynchronize::is_at_safepoint() || | |
760 (res == NULL && Heap_lock->owned_by_self()) || | |
761 (res != NULL && !Heap_lock->owned_by_self()), | |
762 "post condition of the call" ); | |
763 | |
764 return res; | |
765 } | |
766 | |
767 HeapWord* | |
768 G1CollectedHeap::mem_allocate(size_t word_size, | |
769 bool is_noref, | |
770 bool is_tlab, | |
771 bool* gc_overhead_limit_was_exceeded) { | |
772 debug_only(check_for_valid_allocation_state()); | |
773 assert(no_gc_in_progress(), "Allocation during gc not allowed"); | |
774 HeapWord* result = NULL; | |
775 | |
776 // Loop until the allocation is satisified, | |
777 // or unsatisfied after GC. | |
778 for (int try_count = 1; /* return or throw */; try_count += 1) { | |
779 int gc_count_before; | |
780 { | |
781 Heap_lock->lock(); | |
782 result = attempt_allocation(word_size); | |
783 if (result != NULL) { | |
784 // attempt_allocation should have unlocked the heap lock | |
785 assert(is_in(result), "result not in heap"); | |
786 return result; | |
787 } | |
788 // Read the gc count while the heap lock is held. | |
789 gc_count_before = SharedHeap::heap()->total_collections(); | |
790 Heap_lock->unlock(); | |
791 } | |
792 | |
793 // Create the garbage collection operation... | |
794 VM_G1CollectForAllocation op(word_size, | |
795 gc_count_before); | |
796 | |
797 // ...and get the VM thread to execute it. | |
798 VMThread::execute(&op); | |
799 if (op.prologue_succeeded()) { | |
800 result = op.result(); | |
801 assert(result == NULL || is_in(result), "result not in heap"); | |
802 return result; | |
803 } | |
804 | |
805 // Give a warning if we seem to be looping forever. | |
806 if ((QueuedAllocationWarningCount > 0) && | |
807 (try_count % QueuedAllocationWarningCount == 0)) { | |
808 warning("G1CollectedHeap::mem_allocate_work retries %d times", | |
809 try_count); | |
810 } | |
811 } | |
812 } | |
813 | |
814 void G1CollectedHeap::abandon_cur_alloc_region() { | |
815 if (_cur_alloc_region != NULL) { | |
816 // We're finished with the _cur_alloc_region. | |
817 if (_cur_alloc_region->is_empty()) { | |
818 _free_regions++; | |
819 free_region(_cur_alloc_region); | |
820 } else { | |
821 _summary_bytes_used += _cur_alloc_region->used(); | |
822 } | |
823 _cur_alloc_region = NULL; | |
824 } | |
825 } | |
826 | |
636 | 827 void G1CollectedHeap::abandon_gc_alloc_regions() { |
828 // first, make sure that the GC alloc region list is empty (it should!) | |
829 assert(_gc_alloc_region_list == NULL, "invariant"); | |
830 release_gc_alloc_regions(true /* totally */); | |
831 } | |
832 | |
342 | 833 class PostMCRemSetClearClosure: public HeapRegionClosure { |
834 ModRefBarrierSet* _mr_bs; | |
835 public: | |
836 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
837 bool doHeapRegion(HeapRegion* r) { | |
838 r->reset_gc_time_stamp(); | |
839 if (r->continuesHumongous()) | |
840 return false; | |
841 HeapRegionRemSet* hrrs = r->rem_set(); | |
842 if (hrrs != NULL) hrrs->clear(); | |
843 // You might think here that we could clear just the cards | |
844 // corresponding to the used region. But no: if we leave a dirty card | |
845 // in a region we might allocate into, then it would prevent that card | |
846 // from being enqueued, and cause it to be missed. | |
847 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
848 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
849 return false; | |
850 } | |
851 }; | |
852 | |
853 | |
854 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
855 ModRefBarrierSet* _mr_bs; | |
856 public: | |
857 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
858 bool doHeapRegion(HeapRegion* r) { | |
859 if (r->continuesHumongous()) return false; | |
860 if (r->used_region().word_size() != 0) { | |
861 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
862 } | |
863 return false; | |
864 } | |
865 }; | |
866 | |
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867 class RebuildRSOutOfRegionClosure: public HeapRegionClosure { |
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868 G1CollectedHeap* _g1h; |
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869 UpdateRSOopClosure _cl; |
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870 int _worker_i; |
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871 public: |
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872 RebuildRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
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873 _cl(g1->g1_rem_set()->as_HRInto_G1RemSet(), worker_i), |
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874 _worker_i(worker_i), |
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875 _g1h(g1) |
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876 { } |
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877 bool doHeapRegion(HeapRegion* r) { |
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878 if (!r->continuesHumongous()) { |
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879 _cl.set_from(r); |
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880 r->oop_iterate(&_cl); |
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881 } |
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882 return false; |
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883 } |
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884 }; |
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885 |
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886 class ParRebuildRSTask: public AbstractGangTask { |
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887 G1CollectedHeap* _g1; |
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888 public: |
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889 ParRebuildRSTask(G1CollectedHeap* g1) |
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890 : AbstractGangTask("ParRebuildRSTask"), |
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891 _g1(g1) |
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892 { } |
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893 |
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894 void work(int i) { |
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895 RebuildRSOutOfRegionClosure rebuild_rs(_g1, i); |
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896 _g1->heap_region_par_iterate_chunked(&rebuild_rs, i, |
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897 HeapRegion::RebuildRSClaimValue); |
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898 } |
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899 }; |
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900 |
342 | 901 void G1CollectedHeap::do_collection(bool full, bool clear_all_soft_refs, |
902 size_t word_size) { | |
903 ResourceMark rm; | |
904 | |
838
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905 if (PrintHeapAtGC) { |
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906 Universe::print_heap_before_gc(); |
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907 } |
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908 |
342 | 909 if (full && DisableExplicitGC) { |
910 gclog_or_tty->print("\n\n\nDisabling Explicit GC\n\n\n"); | |
911 return; | |
912 } | |
913 | |
914 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
915 assert(Thread::current() == VMThread::vm_thread(), "should be in vm thread"); | |
916 | |
917 if (GC_locker::is_active()) { | |
918 return; // GC is disabled (e.g. JNI GetXXXCritical operation) | |
919 } | |
920 | |
921 { | |
922 IsGCActiveMark x; | |
923 | |
924 // Timing | |
925 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); | |
926 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
927 TraceTime t(full ? "Full GC (System.gc())" : "Full GC", PrintGC, true, gclog_or_tty); | |
928 | |
929 double start = os::elapsedTime(); | |
930 g1_policy()->record_full_collection_start(); | |
931 | |
932 gc_prologue(true); | |
838
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933 increment_total_collections(true /* full gc */); |
342 | 934 |
935 size_t g1h_prev_used = used(); | |
936 assert(used() == recalculate_used(), "Should be equal"); | |
937 | |
938 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
939 HandleMark hm; // Discard invalid handles created during verification | |
940 prepare_for_verify(); | |
941 gclog_or_tty->print(" VerifyBeforeGC:"); | |
942 Universe::verify(true); | |
943 } | |
944 assert(regions_accounted_for(), "Region leakage!"); | |
945 | |
946 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
947 | |
948 // We want to discover references, but not process them yet. | |
949 // This mode is disabled in | |
950 // instanceRefKlass::process_discovered_references if the | |
951 // generation does some collection work, or | |
952 // instanceRefKlass::enqueue_discovered_references if the | |
953 // generation returns without doing any work. | |
954 ref_processor()->disable_discovery(); | |
955 ref_processor()->abandon_partial_discovery(); | |
956 ref_processor()->verify_no_references_recorded(); | |
957 | |
958 // Abandon current iterations of concurrent marking and concurrent | |
959 // refinement, if any are in progress. | |
960 concurrent_mark()->abort(); | |
961 | |
962 // Make sure we'll choose a new allocation region afterwards. | |
963 abandon_cur_alloc_region(); | |
636 | 964 abandon_gc_alloc_regions(); |
342 | 965 assert(_cur_alloc_region == NULL, "Invariant."); |
966 g1_rem_set()->as_HRInto_G1RemSet()->cleanupHRRS(); | |
967 tear_down_region_lists(); | |
968 set_used_regions_to_need_zero_fill(); | |
969 if (g1_policy()->in_young_gc_mode()) { | |
970 empty_young_list(); | |
971 g1_policy()->set_full_young_gcs(true); | |
972 } | |
973 | |
974 // Temporarily make reference _discovery_ single threaded (non-MT). | |
975 ReferenceProcessorMTMutator rp_disc_ser(ref_processor(), false); | |
976 | |
977 // Temporarily make refs discovery atomic | |
978 ReferenceProcessorAtomicMutator rp_disc_atomic(ref_processor(), true); | |
979 | |
980 // Temporarily clear _is_alive_non_header | |
981 ReferenceProcessorIsAliveMutator rp_is_alive_null(ref_processor(), NULL); | |
982 | |
983 ref_processor()->enable_discovery(); | |
457
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984 ref_processor()->setup_policy(clear_all_soft_refs); |
342 | 985 |
986 // Do collection work | |
987 { | |
988 HandleMark hm; // Discard invalid handles created during gc | |
989 G1MarkSweep::invoke_at_safepoint(ref_processor(), clear_all_soft_refs); | |
990 } | |
991 // Because freeing humongous regions may have added some unclean | |
992 // regions, it is necessary to tear down again before rebuilding. | |
993 tear_down_region_lists(); | |
994 rebuild_region_lists(); | |
995 | |
996 _summary_bytes_used = recalculate_used(); | |
997 | |
998 ref_processor()->enqueue_discovered_references(); | |
999 | |
1000 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
1001 | |
1002 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { | |
1003 HandleMark hm; // Discard invalid handles created during verification | |
1004 gclog_or_tty->print(" VerifyAfterGC:"); | |
637
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1005 prepare_for_verify(); |
342 | 1006 Universe::verify(false); |
1007 } | |
1008 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); | |
1009 | |
1010 reset_gc_time_stamp(); | |
1011 // Since everything potentially moved, we will clear all remembered | |
626
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1012 // sets, and clear all cards. Later we will rebuild remebered |
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1013 // sets. We will also reset the GC time stamps of the regions. |
342 | 1014 PostMCRemSetClearClosure rs_clear(mr_bs()); |
1015 heap_region_iterate(&rs_clear); | |
1016 | |
1017 // Resize the heap if necessary. | |
1018 resize_if_necessary_after_full_collection(full ? 0 : word_size); | |
1019 | |
1020 if (_cg1r->use_cache()) { | |
1021 _cg1r->clear_and_record_card_counts(); | |
1022 _cg1r->clear_hot_cache(); | |
1023 } | |
1024 | |
626
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1025 // Rebuild remembered sets of all regions. |
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1026 if (ParallelGCThreads > 0) { |
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1027 ParRebuildRSTask rebuild_rs_task(this); |
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1028 assert(check_heap_region_claim_values( |
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1029 HeapRegion::InitialClaimValue), "sanity check"); |
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1030 set_par_threads(workers()->total_workers()); |
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1031 workers()->run_task(&rebuild_rs_task); |
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1032 set_par_threads(0); |
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1033 assert(check_heap_region_claim_values( |
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1034 HeapRegion::RebuildRSClaimValue), "sanity check"); |
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1035 reset_heap_region_claim_values(); |
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1036 } else { |
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1037 RebuildRSOutOfRegionClosure rebuild_rs(this); |
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1038 heap_region_iterate(&rebuild_rs); |
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1039 } |
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1040 |
342 | 1041 if (PrintGC) { |
1042 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); | |
1043 } | |
1044 | |
1045 if (true) { // FIXME | |
1046 // Ask the permanent generation to adjust size for full collections | |
1047 perm()->compute_new_size(); | |
1048 } | |
1049 | |
1050 double end = os::elapsedTime(); | |
1051 g1_policy()->record_full_collection_end(); | |
1052 | |
546
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1053 #ifdef TRACESPINNING |
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1054 ParallelTaskTerminator::print_termination_counts(); |
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1055 #endif |
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1056 |
342 | 1057 gc_epilogue(true); |
1058 | |
794 | 1059 // Discard all rset updates |
1060 JavaThread::dirty_card_queue_set().abandon_logs(); | |
616
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1061 assert(!G1DeferredRSUpdate |
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1062 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
342 | 1063 assert(regions_accounted_for(), "Region leakage!"); |
1064 } | |
1065 | |
1066 if (g1_policy()->in_young_gc_mode()) { | |
1067 _young_list->reset_sampled_info(); | |
1068 assert( check_young_list_empty(false, false), | |
1069 "young list should be empty at this point"); | |
1070 } | |
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1071 |
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1072 if (PrintHeapAtGC) { |
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1073 Universe::print_heap_after_gc(); |
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1074 } |
342 | 1075 } |
1076 | |
1077 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
1078 do_collection(true, clear_all_soft_refs, 0); | |
1079 } | |
1080 | |
1081 // This code is mostly copied from TenuredGeneration. | |
1082 void | |
1083 G1CollectedHeap:: | |
1084 resize_if_necessary_after_full_collection(size_t word_size) { | |
1085 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
1086 | |
1087 // Include the current allocation, if any, and bytes that will be | |
1088 // pre-allocated to support collections, as "used". | |
1089 const size_t used_after_gc = used(); | |
1090 const size_t capacity_after_gc = capacity(); | |
1091 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
1092 | |
1093 // We don't have floating point command-line arguments | |
1094 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100; | |
1095 const double maximum_used_percentage = 1.0 - minimum_free_percentage; | |
1096 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100; | |
1097 const double minimum_used_percentage = 1.0 - maximum_free_percentage; | |
1098 | |
1099 size_t minimum_desired_capacity = (size_t) (used_after_gc / maximum_used_percentage); | |
1100 size_t maximum_desired_capacity = (size_t) (used_after_gc / minimum_used_percentage); | |
1101 | |
1102 // Don't shrink less than the initial size. | |
1103 minimum_desired_capacity = | |
1104 MAX2(minimum_desired_capacity, | |
1105 collector_policy()->initial_heap_byte_size()); | |
1106 maximum_desired_capacity = | |
1107 MAX2(maximum_desired_capacity, | |
1108 collector_policy()->initial_heap_byte_size()); | |
1109 | |
1110 // We are failing here because minimum_desired_capacity is | |
1111 assert(used_after_gc <= minimum_desired_capacity, "sanity check"); | |
1112 assert(minimum_desired_capacity <= maximum_desired_capacity, "sanity check"); | |
1113 | |
1114 if (PrintGC && Verbose) { | |
1115 const double free_percentage = ((double)free_after_gc) / capacity(); | |
1116 gclog_or_tty->print_cr("Computing new size after full GC "); | |
1117 gclog_or_tty->print_cr(" " | |
1118 " minimum_free_percentage: %6.2f", | |
1119 minimum_free_percentage); | |
1120 gclog_or_tty->print_cr(" " | |
1121 " maximum_free_percentage: %6.2f", | |
1122 maximum_free_percentage); | |
1123 gclog_or_tty->print_cr(" " | |
1124 " capacity: %6.1fK" | |
1125 " minimum_desired_capacity: %6.1fK" | |
1126 " maximum_desired_capacity: %6.1fK", | |
1127 capacity() / (double) K, | |
1128 minimum_desired_capacity / (double) K, | |
1129 maximum_desired_capacity / (double) K); | |
1130 gclog_or_tty->print_cr(" " | |
1131 " free_after_gc : %6.1fK" | |
1132 " used_after_gc : %6.1fK", | |
1133 free_after_gc / (double) K, | |
1134 used_after_gc / (double) K); | |
1135 gclog_or_tty->print_cr(" " | |
1136 " free_percentage: %6.2f", | |
1137 free_percentage); | |
1138 } | |
1139 if (capacity() < minimum_desired_capacity) { | |
1140 // Don't expand unless it's significant | |
1141 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
1142 expand(expand_bytes); | |
1143 if (PrintGC && Verbose) { | |
1144 gclog_or_tty->print_cr(" expanding:" | |
1145 " minimum_desired_capacity: %6.1fK" | |
1146 " expand_bytes: %6.1fK", | |
1147 minimum_desired_capacity / (double) K, | |
1148 expand_bytes / (double) K); | |
1149 } | |
1150 | |
1151 // No expansion, now see if we want to shrink | |
1152 } else if (capacity() > maximum_desired_capacity) { | |
1153 // Capacity too large, compute shrinking size | |
1154 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
1155 shrink(shrink_bytes); | |
1156 if (PrintGC && Verbose) { | |
1157 gclog_or_tty->print_cr(" " | |
1158 " shrinking:" | |
1159 " initSize: %.1fK" | |
1160 " maximum_desired_capacity: %.1fK", | |
1161 collector_policy()->initial_heap_byte_size() / (double) K, | |
1162 maximum_desired_capacity / (double) K); | |
1163 gclog_or_tty->print_cr(" " | |
1164 " shrink_bytes: %.1fK", | |
1165 shrink_bytes / (double) K); | |
1166 } | |
1167 } | |
1168 } | |
1169 | |
1170 | |
1171 HeapWord* | |
1172 G1CollectedHeap::satisfy_failed_allocation(size_t word_size) { | |
1173 HeapWord* result = NULL; | |
1174 | |
1175 // In a G1 heap, we're supposed to keep allocation from failing by | |
1176 // incremental pauses. Therefore, at least for now, we'll favor | |
1177 // expansion over collection. (This might change in the future if we can | |
1178 // do something smarter than full collection to satisfy a failed alloc.) | |
1179 | |
1180 result = expand_and_allocate(word_size); | |
1181 if (result != NULL) { | |
1182 assert(is_in(result), "result not in heap"); | |
1183 return result; | |
1184 } | |
1185 | |
1186 // OK, I guess we have to try collection. | |
1187 | |
1188 do_collection(false, false, word_size); | |
1189 | |
1190 result = attempt_allocation(word_size, /*permit_collection_pause*/false); | |
1191 | |
1192 if (result != NULL) { | |
1193 assert(is_in(result), "result not in heap"); | |
1194 return result; | |
1195 } | |
1196 | |
1197 // Try collecting soft references. | |
1198 do_collection(false, true, word_size); | |
1199 result = attempt_allocation(word_size, /*permit_collection_pause*/false); | |
1200 if (result != NULL) { | |
1201 assert(is_in(result), "result not in heap"); | |
1202 return result; | |
1203 } | |
1204 | |
1205 // What else? We might try synchronous finalization later. If the total | |
1206 // space available is large enough for the allocation, then a more | |
1207 // complete compaction phase than we've tried so far might be | |
1208 // appropriate. | |
1209 return NULL; | |
1210 } | |
1211 | |
1212 // Attempting to expand the heap sufficiently | |
1213 // to support an allocation of the given "word_size". If | |
1214 // successful, perform the allocation and return the address of the | |
1215 // allocated block, or else "NULL". | |
1216 | |
1217 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
1218 size_t expand_bytes = word_size * HeapWordSize; | |
1219 if (expand_bytes < MinHeapDeltaBytes) { | |
1220 expand_bytes = MinHeapDeltaBytes; | |
1221 } | |
1222 expand(expand_bytes); | |
1223 assert(regions_accounted_for(), "Region leakage!"); | |
1224 HeapWord* result = attempt_allocation(word_size, false /* permit_collection_pause */); | |
1225 return result; | |
1226 } | |
1227 | |
1228 size_t G1CollectedHeap::free_region_if_totally_empty(HeapRegion* hr) { | |
1229 size_t pre_used = 0; | |
1230 size_t cleared_h_regions = 0; | |
1231 size_t freed_regions = 0; | |
1232 UncleanRegionList local_list; | |
1233 free_region_if_totally_empty_work(hr, pre_used, cleared_h_regions, | |
1234 freed_regions, &local_list); | |
1235 | |
1236 finish_free_region_work(pre_used, cleared_h_regions, freed_regions, | |
1237 &local_list); | |
1238 return pre_used; | |
1239 } | |
1240 | |
1241 void | |
1242 G1CollectedHeap::free_region_if_totally_empty_work(HeapRegion* hr, | |
1243 size_t& pre_used, | |
1244 size_t& cleared_h, | |
1245 size_t& freed_regions, | |
1246 UncleanRegionList* list, | |
1247 bool par) { | |
1248 assert(!hr->continuesHumongous(), "should have filtered these out"); | |
1249 size_t res = 0; | |
677 | 1250 if (hr->used() > 0 && hr->garbage_bytes() == hr->used() && |
1251 !hr->is_young()) { | |
1252 if (G1PolicyVerbose > 0) | |
1253 gclog_or_tty->print_cr("Freeing empty region "PTR_FORMAT "(" SIZE_FORMAT " bytes)" | |
1254 " during cleanup", hr, hr->used()); | |
1255 free_region_work(hr, pre_used, cleared_h, freed_regions, list, par); | |
342 | 1256 } |
1257 } | |
1258 | |
1259 // FIXME: both this and shrink could probably be more efficient by | |
1260 // doing one "VirtualSpace::expand_by" call rather than several. | |
1261 void G1CollectedHeap::expand(size_t expand_bytes) { | |
1262 size_t old_mem_size = _g1_storage.committed_size(); | |
1263 // We expand by a minimum of 1K. | |
1264 expand_bytes = MAX2(expand_bytes, (size_t)K); | |
1265 size_t aligned_expand_bytes = | |
1266 ReservedSpace::page_align_size_up(expand_bytes); | |
1267 aligned_expand_bytes = align_size_up(aligned_expand_bytes, | |
1268 HeapRegion::GrainBytes); | |
1269 expand_bytes = aligned_expand_bytes; | |
1270 while (expand_bytes > 0) { | |
1271 HeapWord* base = (HeapWord*)_g1_storage.high(); | |
1272 // Commit more storage. | |
1273 bool successful = _g1_storage.expand_by(HeapRegion::GrainBytes); | |
1274 if (!successful) { | |
1275 expand_bytes = 0; | |
1276 } else { | |
1277 expand_bytes -= HeapRegion::GrainBytes; | |
1278 // Expand the committed region. | |
1279 HeapWord* high = (HeapWord*) _g1_storage.high(); | |
1280 _g1_committed.set_end(high); | |
1281 // Create a new HeapRegion. | |
1282 MemRegion mr(base, high); | |
1283 bool is_zeroed = !_g1_max_committed.contains(base); | |
1284 HeapRegion* hr = new HeapRegion(_bot_shared, mr, is_zeroed); | |
1285 | |
1286 // Now update max_committed if necessary. | |
1287 _g1_max_committed.set_end(MAX2(_g1_max_committed.end(), high)); | |
1288 | |
1289 // Add it to the HeapRegionSeq. | |
1290 _hrs->insert(hr); | |
1291 // Set the zero-fill state, according to whether it's already | |
1292 // zeroed. | |
1293 { | |
1294 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
1295 if (is_zeroed) { | |
1296 hr->set_zero_fill_complete(); | |
1297 put_free_region_on_list_locked(hr); | |
1298 } else { | |
1299 hr->set_zero_fill_needed(); | |
1300 put_region_on_unclean_list_locked(hr); | |
1301 } | |
1302 } | |
1303 _free_regions++; | |
1304 // And we used up an expansion region to create it. | |
1305 _expansion_regions--; | |
1306 // Tell the cardtable about it. | |
1307 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
1308 // And the offset table as well. | |
1309 _bot_shared->resize(_g1_committed.word_size()); | |
1310 } | |
1311 } | |
1312 if (Verbose && PrintGC) { | |
1313 size_t new_mem_size = _g1_storage.committed_size(); | |
1314 gclog_or_tty->print_cr("Expanding garbage-first heap from %ldK by %ldK to %ldK", | |
1315 old_mem_size/K, aligned_expand_bytes/K, | |
1316 new_mem_size/K); | |
1317 } | |
1318 } | |
1319 | |
1320 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) | |
1321 { | |
1322 size_t old_mem_size = _g1_storage.committed_size(); | |
1323 size_t aligned_shrink_bytes = | |
1324 ReservedSpace::page_align_size_down(shrink_bytes); | |
1325 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
1326 HeapRegion::GrainBytes); | |
1327 size_t num_regions_deleted = 0; | |
1328 MemRegion mr = _hrs->shrink_by(aligned_shrink_bytes, num_regions_deleted); | |
1329 | |
1330 assert(mr.end() == (HeapWord*)_g1_storage.high(), "Bad shrink!"); | |
1331 if (mr.byte_size() > 0) | |
1332 _g1_storage.shrink_by(mr.byte_size()); | |
1333 assert(mr.start() == (HeapWord*)_g1_storage.high(), "Bad shrink!"); | |
1334 | |
1335 _g1_committed.set_end(mr.start()); | |
1336 _free_regions -= num_regions_deleted; | |
1337 _expansion_regions += num_regions_deleted; | |
1338 | |
1339 // Tell the cardtable about it. | |
1340 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
1341 | |
1342 // And the offset table as well. | |
1343 _bot_shared->resize(_g1_committed.word_size()); | |
1344 | |
1345 HeapRegionRemSet::shrink_heap(n_regions()); | |
1346 | |
1347 if (Verbose && PrintGC) { | |
1348 size_t new_mem_size = _g1_storage.committed_size(); | |
1349 gclog_or_tty->print_cr("Shrinking garbage-first heap from %ldK by %ldK to %ldK", | |
1350 old_mem_size/K, aligned_shrink_bytes/K, | |
1351 new_mem_size/K); | |
1352 } | |
1353 } | |
1354 | |
1355 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
636 | 1356 release_gc_alloc_regions(true /* totally */); |
342 | 1357 tear_down_region_lists(); // We will rebuild them in a moment. |
1358 shrink_helper(shrink_bytes); | |
1359 rebuild_region_lists(); | |
1360 } | |
1361 | |
1362 // Public methods. | |
1363 | |
1364 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
1365 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
1366 #endif // _MSC_VER | |
1367 | |
1368 | |
1369 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
1370 SharedHeap(policy_), | |
1371 _g1_policy(policy_), | |
1372 _ref_processor(NULL), | |
1373 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), | |
1374 _bot_shared(NULL), | |
1375 _par_alloc_during_gc_lock(Mutex::leaf, "par alloc during GC lock"), | |
1376 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
1377 _evac_failure_scan_stack(NULL) , | |
1378 _mark_in_progress(false), | |
1379 _cg1r(NULL), _czft(NULL), _summary_bytes_used(0), | |
1380 _cur_alloc_region(NULL), | |
1381 _refine_cte_cl(NULL), | |
1382 _free_region_list(NULL), _free_region_list_size(0), | |
1383 _free_regions(0), | |
1384 _full_collection(false), | |
1385 _unclean_region_list(), | |
1386 _unclean_regions_coming(false), | |
1387 _young_list(new YoungList(this)), | |
1388 _gc_time_stamp(0), | |
526 | 1389 _surviving_young_words(NULL), |
1390 _in_cset_fast_test(NULL), | |
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1391 _in_cset_fast_test_base(NULL), |
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1392 _dirty_cards_region_list(NULL) { |
342 | 1393 _g1h = this; // To catch bugs. |
1394 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
1395 vm_exit_during_initialization("Failed necessary allocation."); | |
1396 } | |
1397 int n_queues = MAX2((int)ParallelGCThreads, 1); | |
1398 _task_queues = new RefToScanQueueSet(n_queues); | |
1399 | |
1400 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
1401 assert(n_rem_sets > 0, "Invariant."); | |
1402 | |
1403 HeapRegionRemSetIterator** iter_arr = | |
1404 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
1405 for (int i = 0; i < n_queues; i++) { | |
1406 iter_arr[i] = new HeapRegionRemSetIterator(); | |
1407 } | |
1408 _rem_set_iterator = iter_arr; | |
1409 | |
1410 for (int i = 0; i < n_queues; i++) { | |
1411 RefToScanQueue* q = new RefToScanQueue(); | |
1412 q->initialize(); | |
1413 _task_queues->register_queue(i, q); | |
1414 } | |
1415 | |
1416 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
636 | 1417 _gc_alloc_regions[ap] = NULL; |
1418 _gc_alloc_region_counts[ap] = 0; | |
1419 _retained_gc_alloc_regions[ap] = NULL; | |
1420 // by default, we do not retain a GC alloc region for each ap; | |
1421 // we'll override this, when appropriate, below | |
1422 _retain_gc_alloc_region[ap] = false; | |
1423 } | |
1424 | |
1425 // We will try to remember the last half-full tenured region we | |
1426 // allocated to at the end of a collection so that we can re-use it | |
1427 // during the next collection. | |
1428 _retain_gc_alloc_region[GCAllocForTenured] = true; | |
1429 | |
342 | 1430 guarantee(_task_queues != NULL, "task_queues allocation failure."); |
1431 } | |
1432 | |
1433 jint G1CollectedHeap::initialize() { | |
1434 os::enable_vtime(); | |
1435 | |
1436 // Necessary to satisfy locking discipline assertions. | |
1437 | |
1438 MutexLocker x(Heap_lock); | |
1439 | |
1440 // While there are no constraints in the GC code that HeapWordSize | |
1441 // be any particular value, there are multiple other areas in the | |
1442 // system which believe this to be true (e.g. oop->object_size in some | |
1443 // cases incorrectly returns the size in wordSize units rather than | |
1444 // HeapWordSize). | |
1445 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
1446 | |
1447 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
1448 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
1449 | |
1450 // Ensure that the sizes are properly aligned. | |
1451 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
1452 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
1453 | |
1454 // We allocate this in any case, but only do no work if the command line | |
1455 // param is off. | |
1456 _cg1r = new ConcurrentG1Refine(); | |
1457 | |
1458 // Reserve the maximum. | |
1459 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
1460 // Includes the perm-gen. | |
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1461 |
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1462 const size_t total_reserved = max_byte_size + pgs->max_size(); |
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1463 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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1464 |
342 | 1465 ReservedSpace heap_rs(max_byte_size + pgs->max_size(), |
1466 HeapRegion::GrainBytes, | |
642
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1467 false /*ism*/, addr); |
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1468 |
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1469 if (UseCompressedOops) { |
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1470 if (addr != NULL && !heap_rs.is_reserved()) { |
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1471 // Failed to reserve at specified address - the requested memory |
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1472 // region is taken already, for example, by 'java' launcher. |
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1473 // Try again to reserver heap higher. |
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1474 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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1475 ReservedSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
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1476 false /*ism*/, addr); |
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1477 if (addr != NULL && !heap_rs0.is_reserved()) { |
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1478 // Failed to reserve at specified address again - give up. |
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1479 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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1480 assert(addr == NULL, ""); |
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1481 ReservedSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
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1482 false /*ism*/, addr); |
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1483 heap_rs = heap_rs1; |
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1484 } else { |
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1485 heap_rs = heap_rs0; |
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1486 } |
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1487 } |
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1488 } |
342 | 1489 |
1490 if (!heap_rs.is_reserved()) { | |
1491 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
1492 return JNI_ENOMEM; | |
1493 } | |
1494 | |
1495 // It is important to do this in a way such that concurrent readers can't | |
1496 // temporarily think somethings in the heap. (I've actually seen this | |
1497 // happen in asserts: DLD.) | |
1498 _reserved.set_word_size(0); | |
1499 _reserved.set_start((HeapWord*)heap_rs.base()); | |
1500 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
1501 | |
1502 _expansion_regions = max_byte_size/HeapRegion::GrainBytes; | |
1503 | |
1504 _num_humongous_regions = 0; | |
1505 | |
1506 // Create the gen rem set (and barrier set) for the entire reserved region. | |
1507 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
1508 set_barrier_set(rem_set()->bs()); | |
1509 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
1510 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
1511 } else { | |
1512 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
1513 return JNI_ENOMEM; | |
1514 } | |
1515 | |
1516 // Also create a G1 rem set. | |
1517 if (G1UseHRIntoRS) { | |
1518 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { | |
1519 _g1_rem_set = new HRInto_G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
1520 } else { | |
1521 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); | |
1522 return JNI_ENOMEM; | |
1523 } | |
1524 } else { | |
1525 _g1_rem_set = new StupidG1RemSet(this); | |
1526 } | |
1527 | |
1528 // Carve out the G1 part of the heap. | |
1529 | |
1530 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
1531 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
1532 g1_rs.size()/HeapWordSize); | |
1533 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
1534 | |
1535 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
1536 | |
1537 _g1_storage.initialize(g1_rs, 0); | |
1538 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
1539 _g1_max_committed = _g1_committed; | |
393 | 1540 _hrs = new HeapRegionSeq(_expansion_regions); |
342 | 1541 guarantee(_hrs != NULL, "Couldn't allocate HeapRegionSeq"); |
1542 guarantee(_cur_alloc_region == NULL, "from constructor"); | |
1543 | |
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1544 // 6843694 - ensure that the maximum region index can fit |
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1545 // in the remembered set structures. |
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1546 const size_t max_region_idx = ((size_t)1 << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; |
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1547 guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); |
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1548 |
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1549 const size_t cards_per_region = HeapRegion::GrainBytes >> CardTableModRefBS::card_shift; |
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1550 size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1; |
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1551 guarantee(cards_per_region < max_cards_per_region, "too many cards per region"); |
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1552 |
342 | 1553 _bot_shared = new G1BlockOffsetSharedArray(_reserved, |
1554 heap_word_size(init_byte_size)); | |
1555 | |
1556 _g1h = this; | |
1557 | |
1558 // Create the ConcurrentMark data structure and thread. | |
1559 // (Must do this late, so that "max_regions" is defined.) | |
1560 _cm = new ConcurrentMark(heap_rs, (int) max_regions()); | |
1561 _cmThread = _cm->cmThread(); | |
1562 | |
1563 // ...and the concurrent zero-fill thread, if necessary. | |
1564 if (G1ConcZeroFill) { | |
1565 _czft = new ConcurrentZFThread(); | |
1566 } | |
1567 | |
1568 // Initialize the from_card cache structure of HeapRegionRemSet. | |
1569 HeapRegionRemSet::init_heap(max_regions()); | |
1570 | |
677 | 1571 // Now expand into the initial heap size. |
1572 expand(init_byte_size); | |
342 | 1573 |
1574 // Perform any initialization actions delegated to the policy. | |
1575 g1_policy()->init(); | |
1576 | |
1577 g1_policy()->note_start_of_mark_thread(); | |
1578 | |
1579 _refine_cte_cl = | |
1580 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
1581 g1_rem_set(), | |
1582 concurrent_g1_refine()); | |
1583 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
1584 | |
1585 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
1586 SATB_Q_FL_lock, | |
1587 0, | |
1588 Shared_SATB_Q_lock); | |
794 | 1589 |
1590 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
1591 DirtyCardQ_FL_lock, | |
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1592 G1UpdateBufferQueueMaxLength, |
794 | 1593 Shared_DirtyCardQ_lock); |
1594 | |
616
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1595 if (G1DeferredRSUpdate) { |
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1596 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
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1597 DirtyCardQ_FL_lock, |
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1598 0, |
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1599 Shared_DirtyCardQ_lock, |
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1600 &JavaThread::dirty_card_queue_set()); |
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1601 } |
342 | 1602 // In case we're keeping closure specialization stats, initialize those |
1603 // counts and that mechanism. | |
1604 SpecializationStats::clear(); | |
1605 | |
1606 _gc_alloc_region_list = NULL; | |
1607 | |
1608 // Do later initialization work for concurrent refinement. | |
1609 _cg1r->init(); | |
1610 | |
1611 return JNI_OK; | |
1612 } | |
1613 | |
1614 void G1CollectedHeap::ref_processing_init() { | |
1615 SharedHeap::ref_processing_init(); | |
1616 MemRegion mr = reserved_region(); | |
1617 _ref_processor = ReferenceProcessor::create_ref_processor( | |
1618 mr, // span | |
1619 false, // Reference discovery is not atomic | |
1620 // (though it shouldn't matter here.) | |
1621 true, // mt_discovery | |
1622 NULL, // is alive closure: need to fill this in for efficiency | |
1623 ParallelGCThreads, | |
1624 ParallelRefProcEnabled, | |
1625 true); // Setting next fields of discovered | |
1626 // lists requires a barrier. | |
1627 } | |
1628 | |
1629 size_t G1CollectedHeap::capacity() const { | |
1630 return _g1_committed.byte_size(); | |
1631 } | |
1632 | |
1633 void G1CollectedHeap::iterate_dirty_card_closure(bool concurrent, | |
1634 int worker_i) { | |
889 | 1635 // Clean cards in the hot card cache |
1636 concurrent_g1_refine()->clean_up_cache(worker_i, g1_rem_set()); | |
1637 | |
342 | 1638 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
1639 int n_completed_buffers = 0; | |
1640 while (dcqs.apply_closure_to_completed_buffer(worker_i, 0, true)) { | |
1641 n_completed_buffers++; | |
1642 } | |
1643 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
1644 (double) n_completed_buffers); | |
1645 dcqs.clear_n_completed_buffers(); | |
1646 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
1647 } | |
1648 | |
1649 | |
1650 // Computes the sum of the storage used by the various regions. | |
1651 | |
1652 size_t G1CollectedHeap::used() const { | |
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1653 assert(Heap_lock->owner() != NULL, |
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1654 "Should be owned on this thread's behalf."); |
342 | 1655 size_t result = _summary_bytes_used; |
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1656 // Read only once in case it is set to NULL concurrently |
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1657 HeapRegion* hr = _cur_alloc_region; |
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1658 if (hr != NULL) |
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1659 result += hr->used(); |
342 | 1660 return result; |
1661 } | |
1662 | |
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1663 size_t G1CollectedHeap::used_unlocked() const { |
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1664 size_t result = _summary_bytes_used; |
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1665 return result; |
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1666 } |
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1667 |
342 | 1668 class SumUsedClosure: public HeapRegionClosure { |
1669 size_t _used; | |
1670 public: | |
1671 SumUsedClosure() : _used(0) {} | |
1672 bool doHeapRegion(HeapRegion* r) { | |
1673 if (!r->continuesHumongous()) { | |
1674 _used += r->used(); | |
1675 } | |
1676 return false; | |
1677 } | |
1678 size_t result() { return _used; } | |
1679 }; | |
1680 | |
1681 size_t G1CollectedHeap::recalculate_used() const { | |
1682 SumUsedClosure blk; | |
1683 _hrs->iterate(&blk); | |
1684 return blk.result(); | |
1685 } | |
1686 | |
1687 #ifndef PRODUCT | |
1688 class SumUsedRegionsClosure: public HeapRegionClosure { | |
1689 size_t _num; | |
1690 public: | |
677 | 1691 SumUsedRegionsClosure() : _num(0) {} |
342 | 1692 bool doHeapRegion(HeapRegion* r) { |
1693 if (r->continuesHumongous() || r->used() > 0 || r->is_gc_alloc_region()) { | |
1694 _num += 1; | |
1695 } | |
1696 return false; | |
1697 } | |
1698 size_t result() { return _num; } | |
1699 }; | |
1700 | |
1701 size_t G1CollectedHeap::recalculate_used_regions() const { | |
1702 SumUsedRegionsClosure blk; | |
1703 _hrs->iterate(&blk); | |
1704 return blk.result(); | |
1705 } | |
1706 #endif // PRODUCT | |
1707 | |
1708 size_t G1CollectedHeap::unsafe_max_alloc() { | |
1709 if (_free_regions > 0) return HeapRegion::GrainBytes; | |
1710 // otherwise, is there space in the current allocation region? | |
1711 | |
1712 // We need to store the current allocation region in a local variable | |
1713 // here. The problem is that this method doesn't take any locks and | |
1714 // there may be other threads which overwrite the current allocation | |
1715 // region field. attempt_allocation(), for example, sets it to NULL | |
1716 // and this can happen *after* the NULL check here but before the call | |
1717 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
1718 // to be a problem in the optimized build, since the two loads of the | |
1719 // current allocation region field are optimized away. | |
1720 HeapRegion* car = _cur_alloc_region; | |
1721 | |
1722 // FIXME: should iterate over all regions? | |
1723 if (car == NULL) { | |
1724 return 0; | |
1725 } | |
1726 return car->free(); | |
1727 } | |
1728 | |
1729 void G1CollectedHeap::collect(GCCause::Cause cause) { | |
1730 // The caller doesn't have the Heap_lock | |
1731 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
1732 MutexLocker ml(Heap_lock); | |
1733 collect_locked(cause); | |
1734 } | |
1735 | |
1736 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { | |
1737 assert(Thread::current()->is_VM_thread(), "Precondition#1"); | |
1738 assert(Heap_lock->is_locked(), "Precondition#2"); | |
1739 GCCauseSetter gcs(this, cause); | |
1740 switch (cause) { | |
1741 case GCCause::_heap_inspection: | |
1742 case GCCause::_heap_dump: { | |
1743 HandleMark hm; | |
1744 do_full_collection(false); // don't clear all soft refs | |
1745 break; | |
1746 } | |
1747 default: // XXX FIX ME | |
1748 ShouldNotReachHere(); // Unexpected use of this function | |
1749 } | |
1750 } | |
1751 | |
1752 | |
1753 void G1CollectedHeap::collect_locked(GCCause::Cause cause) { | |
1754 // Don't want to do a GC until cleanup is completed. | |
1755 wait_for_cleanup_complete(); | |
1756 | |
1757 // Read the GC count while holding the Heap_lock | |
1758 int gc_count_before = SharedHeap::heap()->total_collections(); | |
1759 { | |
1760 MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back | |
1761 VM_G1CollectFull op(gc_count_before, cause); | |
1762 VMThread::execute(&op); | |
1763 } | |
1764 } | |
1765 | |
1766 bool G1CollectedHeap::is_in(const void* p) const { | |
1767 if (_g1_committed.contains(p)) { | |
1768 HeapRegion* hr = _hrs->addr_to_region(p); | |
1769 return hr->is_in(p); | |
1770 } else { | |
1771 return _perm_gen->as_gen()->is_in(p); | |
1772 } | |
1773 } | |
1774 | |
1775 // Iteration functions. | |
1776 | |
1777 // Iterates an OopClosure over all ref-containing fields of objects | |
1778 // within a HeapRegion. | |
1779 | |
1780 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
1781 MemRegion _mr; | |
1782 OopClosure* _cl; | |
1783 public: | |
1784 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
1785 : _mr(mr), _cl(cl) {} | |
1786 bool doHeapRegion(HeapRegion* r) { | |
1787 if (! r->continuesHumongous()) { | |
1788 r->oop_iterate(_cl); | |
1789 } | |
1790 return false; | |
1791 } | |
1792 }; | |
1793 | |
678 | 1794 void G1CollectedHeap::oop_iterate(OopClosure* cl, bool do_perm) { |
342 | 1795 IterateOopClosureRegionClosure blk(_g1_committed, cl); |
1796 _hrs->iterate(&blk); | |
678 | 1797 if (do_perm) { |
1798 perm_gen()->oop_iterate(cl); | |
1799 } | |
342 | 1800 } |
1801 | |
678 | 1802 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm) { |
342 | 1803 IterateOopClosureRegionClosure blk(mr, cl); |
1804 _hrs->iterate(&blk); | |
678 | 1805 if (do_perm) { |
1806 perm_gen()->oop_iterate(cl); | |
1807 } | |
342 | 1808 } |
1809 | |
1810 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
1811 | |
1812 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
1813 ObjectClosure* _cl; | |
1814 public: | |
1815 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
1816 bool doHeapRegion(HeapRegion* r) { | |
1817 if (! r->continuesHumongous()) { | |
1818 r->object_iterate(_cl); | |
1819 } | |
1820 return false; | |
1821 } | |
1822 }; | |
1823 | |
678 | 1824 void G1CollectedHeap::object_iterate(ObjectClosure* cl, bool do_perm) { |
342 | 1825 IterateObjectClosureRegionClosure blk(cl); |
1826 _hrs->iterate(&blk); | |
678 | 1827 if (do_perm) { |
1828 perm_gen()->object_iterate(cl); | |
1829 } | |
342 | 1830 } |
1831 | |
1832 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
1833 // FIXME: is this right? | |
1834 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
1835 } | |
1836 | |
1837 // Calls a SpaceClosure on a HeapRegion. | |
1838 | |
1839 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
1840 SpaceClosure* _cl; | |
1841 public: | |
1842 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
1843 bool doHeapRegion(HeapRegion* r) { | |
1844 _cl->do_space(r); | |
1845 return false; | |
1846 } | |
1847 }; | |
1848 | |
1849 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
1850 SpaceClosureRegionClosure blk(cl); | |
1851 _hrs->iterate(&blk); | |
1852 } | |
1853 | |
1854 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) { | |
1855 _hrs->iterate(cl); | |
1856 } | |
1857 | |
1858 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
1859 HeapRegionClosure* cl) { | |
1860 _hrs->iterate_from(r, cl); | |
1861 } | |
1862 | |
1863 void | |
1864 G1CollectedHeap::heap_region_iterate_from(int idx, HeapRegionClosure* cl) { | |
1865 _hrs->iterate_from(idx, cl); | |
1866 } | |
1867 | |
1868 HeapRegion* G1CollectedHeap::region_at(size_t idx) { return _hrs->at(idx); } | |
1869 | |
1870 void | |
1871 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
1872 int worker, | |
1873 jint claim_value) { | |
355 | 1874 const size_t regions = n_regions(); |
1875 const size_t worker_num = (ParallelGCThreads > 0 ? ParallelGCThreads : 1); | |
1876 // try to spread out the starting points of the workers | |
1877 const size_t start_index = regions / worker_num * (size_t) worker; | |
1878 | |
1879 // each worker will actually look at all regions | |
1880 for (size_t count = 0; count < regions; ++count) { | |
1881 const size_t index = (start_index + count) % regions; | |
1882 assert(0 <= index && index < regions, "sanity"); | |
1883 HeapRegion* r = region_at(index); | |
1884 // we'll ignore "continues humongous" regions (we'll process them | |
1885 // when we come across their corresponding "start humongous" | |
1886 // region) and regions already claimed | |
1887 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
1888 continue; | |
1889 } | |
1890 // OK, try to claim it | |
342 | 1891 if (r->claimHeapRegion(claim_value)) { |
355 | 1892 // success! |
1893 assert(!r->continuesHumongous(), "sanity"); | |
1894 if (r->startsHumongous()) { | |
1895 // If the region is "starts humongous" we'll iterate over its | |
1896 // "continues humongous" first; in fact we'll do them | |
1897 // first. The order is important. In on case, calling the | |
1898 // closure on the "starts humongous" region might de-allocate | |
1899 // and clear all its "continues humongous" regions and, as a | |
1900 // result, we might end up processing them twice. So, we'll do | |
1901 // them first (notice: most closures will ignore them anyway) and | |
1902 // then we'll do the "starts humongous" region. | |
1903 for (size_t ch_index = index + 1; ch_index < regions; ++ch_index) { | |
1904 HeapRegion* chr = region_at(ch_index); | |
1905 | |
1906 // if the region has already been claimed or it's not | |
1907 // "continues humongous" we're done | |
1908 if (chr->claim_value() == claim_value || | |
1909 !chr->continuesHumongous()) { | |
1910 break; | |
1911 } | |
1912 | |
1913 // Noone should have claimed it directly. We can given | |
1914 // that we claimed its "starts humongous" region. | |
1915 assert(chr->claim_value() != claim_value, "sanity"); | |
1916 assert(chr->humongous_start_region() == r, "sanity"); | |
1917 | |
1918 if (chr->claimHeapRegion(claim_value)) { | |
1919 // we should always be able to claim it; noone else should | |
1920 // be trying to claim this region | |
1921 | |
1922 bool res2 = cl->doHeapRegion(chr); | |
1923 assert(!res2, "Should not abort"); | |
1924 | |
1925 // Right now, this holds (i.e., no closure that actually | |
1926 // does something with "continues humongous" regions | |
1927 // clears them). We might have to weaken it in the future, | |
1928 // but let's leave these two asserts here for extra safety. | |
1929 assert(chr->continuesHumongous(), "should still be the case"); | |
1930 assert(chr->humongous_start_region() == r, "sanity"); | |
1931 } else { | |
1932 guarantee(false, "we should not reach here"); | |
1933 } | |
1934 } | |
1935 } | |
1936 | |
1937 assert(!r->continuesHumongous(), "sanity"); | |
1938 bool res = cl->doHeapRegion(r); | |
1939 assert(!res, "Should not abort"); | |
1940 } | |
1941 } | |
1942 } | |
1943 | |
390 | 1944 class ResetClaimValuesClosure: public HeapRegionClosure { |
1945 public: | |
1946 bool doHeapRegion(HeapRegion* r) { | |
1947 r->set_claim_value(HeapRegion::InitialClaimValue); | |
1948 return false; | |
1949 } | |
1950 }; | |
1951 | |
1952 void | |
1953 G1CollectedHeap::reset_heap_region_claim_values() { | |
1954 ResetClaimValuesClosure blk; | |
1955 heap_region_iterate(&blk); | |
1956 } | |
1957 | |
355 | 1958 #ifdef ASSERT |
1959 // This checks whether all regions in the heap have the correct claim | |
1960 // value. I also piggy-backed on this a check to ensure that the | |
1961 // humongous_start_region() information on "continues humongous" | |
1962 // regions is correct. | |
1963 | |
1964 class CheckClaimValuesClosure : public HeapRegionClosure { | |
1965 private: | |
1966 jint _claim_value; | |
1967 size_t _failures; | |
1968 HeapRegion* _sh_region; | |
1969 public: | |
1970 CheckClaimValuesClosure(jint claim_value) : | |
1971 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
1972 bool doHeapRegion(HeapRegion* r) { | |
1973 if (r->claim_value() != _claim_value) { | |
1974 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
1975 "claim value = %d, should be %d", | |
1976 r->bottom(), r->end(), r->claim_value(), | |
1977 _claim_value); | |
1978 ++_failures; | |
1979 } | |
1980 if (!r->isHumongous()) { | |
1981 _sh_region = NULL; | |
1982 } else if (r->startsHumongous()) { | |
1983 _sh_region = r; | |
1984 } else if (r->continuesHumongous()) { | |
1985 if (r->humongous_start_region() != _sh_region) { | |
1986 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
1987 "HS = "PTR_FORMAT", should be "PTR_FORMAT, | |
1988 r->bottom(), r->end(), | |
1989 r->humongous_start_region(), | |
1990 _sh_region); | |
1991 ++_failures; | |
342 | 1992 } |
1993 } | |
355 | 1994 return false; |
1995 } | |
1996 size_t failures() { | |
1997 return _failures; | |
1998 } | |
1999 }; | |
2000 | |
2001 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
2002 CheckClaimValuesClosure cl(claim_value); | |
2003 heap_region_iterate(&cl); | |
2004 return cl.failures() == 0; | |
2005 } | |
2006 #endif // ASSERT | |
342 | 2007 |
2008 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { | |
2009 HeapRegion* r = g1_policy()->collection_set(); | |
2010 while (r != NULL) { | |
2011 HeapRegion* next = r->next_in_collection_set(); | |
2012 if (cl->doHeapRegion(r)) { | |
2013 cl->incomplete(); | |
2014 return; | |
2015 } | |
2016 r = next; | |
2017 } | |
2018 } | |
2019 | |
2020 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
2021 HeapRegionClosure *cl) { | |
2022 assert(r->in_collection_set(), | |
2023 "Start region must be a member of the collection set."); | |
2024 HeapRegion* cur = r; | |
2025 while (cur != NULL) { | |
2026 HeapRegion* next = cur->next_in_collection_set(); | |
2027 if (cl->doHeapRegion(cur) && false) { | |
2028 cl->incomplete(); | |
2029 return; | |
2030 } | |
2031 cur = next; | |
2032 } | |
2033 cur = g1_policy()->collection_set(); | |
2034 while (cur != r) { | |
2035 HeapRegion* next = cur->next_in_collection_set(); | |
2036 if (cl->doHeapRegion(cur) && false) { | |
2037 cl->incomplete(); | |
2038 return; | |
2039 } | |
2040 cur = next; | |
2041 } | |
2042 } | |
2043 | |
2044 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
2045 return _hrs->length() > 0 ? _hrs->at(0) : NULL; | |
2046 } | |
2047 | |
2048 | |
2049 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
2050 Space* res = heap_region_containing(addr); | |
2051 if (res == NULL) | |
2052 res = perm_gen()->space_containing(addr); | |
2053 return res; | |
2054 } | |
2055 | |
2056 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
2057 Space* sp = space_containing(addr); | |
2058 if (sp != NULL) { | |
2059 return sp->block_start(addr); | |
2060 } | |
2061 return NULL; | |
2062 } | |
2063 | |
2064 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
2065 Space* sp = space_containing(addr); | |
2066 assert(sp != NULL, "block_size of address outside of heap"); | |
2067 return sp->block_size(addr); | |
2068 } | |
2069 | |
2070 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
2071 Space* sp = space_containing(addr); | |
2072 return sp->block_is_obj(addr); | |
2073 } | |
2074 | |
2075 bool G1CollectedHeap::supports_tlab_allocation() const { | |
2076 return true; | |
2077 } | |
2078 | |
2079 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
2080 return HeapRegion::GrainBytes; | |
2081 } | |
2082 | |
2083 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
2084 // Return the remaining space in the cur alloc region, but not less than | |
2085 // the min TLAB size. | |
2086 // Also, no more than half the region size, since we can't allow tlabs to | |
2087 // grow big enough to accomodate humongous objects. | |
2088 | |
2089 // We need to story it locally, since it might change between when we | |
2090 // test for NULL and when we use it later. | |
2091 ContiguousSpace* cur_alloc_space = _cur_alloc_region; | |
2092 if (cur_alloc_space == NULL) { | |
2093 return HeapRegion::GrainBytes/2; | |
2094 } else { | |
2095 return MAX2(MIN2(cur_alloc_space->free(), | |
2096 (size_t)(HeapRegion::GrainBytes/2)), | |
2097 (size_t)MinTLABSize); | |
2098 } | |
2099 } | |
2100 | |
2101 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t size) { | |
2102 bool dummy; | |
2103 return G1CollectedHeap::mem_allocate(size, false, true, &dummy); | |
2104 } | |
2105 | |
2106 bool G1CollectedHeap::allocs_are_zero_filled() { | |
2107 return false; | |
2108 } | |
2109 | |
2110 size_t G1CollectedHeap::large_typearray_limit() { | |
2111 // FIXME | |
2112 return HeapRegion::GrainBytes/HeapWordSize; | |
2113 } | |
2114 | |
2115 size_t G1CollectedHeap::max_capacity() const { | |
2116 return _g1_committed.byte_size(); | |
2117 } | |
2118 | |
2119 jlong G1CollectedHeap::millis_since_last_gc() { | |
2120 // assert(false, "NYI"); | |
2121 return 0; | |
2122 } | |
2123 | |
2124 | |
2125 void G1CollectedHeap::prepare_for_verify() { | |
2126 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
2127 ensure_parsability(false); | |
2128 } | |
2129 g1_rem_set()->prepare_for_verify(); | |
2130 } | |
2131 | |
2132 class VerifyLivenessOopClosure: public OopClosure { | |
2133 G1CollectedHeap* g1h; | |
2134 public: | |
2135 VerifyLivenessOopClosure(G1CollectedHeap* _g1h) { | |
2136 g1h = _g1h; | |
2137 } | |
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2138 void do_oop(narrowOop *p) { do_oop_work(p); } |
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2139 void do_oop( oop *p) { do_oop_work(p); } |
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2140 |
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2141 template <class T> void do_oop_work(T *p) { |
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2142 oop obj = oopDesc::load_decode_heap_oop(p); |
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2143 guarantee(obj == NULL || !g1h->is_obj_dead(obj), |
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2144 "Dead object referenced by a not dead object"); |
342 | 2145 } |
2146 }; | |
2147 | |
2148 class VerifyObjsInRegionClosure: public ObjectClosure { | |
811 | 2149 private: |
342 | 2150 G1CollectedHeap* _g1h; |
2151 size_t _live_bytes; | |
2152 HeapRegion *_hr; | |
811 | 2153 bool _use_prev_marking; |
342 | 2154 public: |
811 | 2155 // use_prev_marking == true -> use "prev" marking information, |
2156 // use_prev_marking == false -> use "next" marking information | |
2157 VerifyObjsInRegionClosure(HeapRegion *hr, bool use_prev_marking) | |
2158 : _live_bytes(0), _hr(hr), _use_prev_marking(use_prev_marking) { | |
342 | 2159 _g1h = G1CollectedHeap::heap(); |
2160 } | |
2161 void do_object(oop o) { | |
2162 VerifyLivenessOopClosure isLive(_g1h); | |
2163 assert(o != NULL, "Huh?"); | |
811 | 2164 if (!_g1h->is_obj_dead_cond(o, _use_prev_marking)) { |
342 | 2165 o->oop_iterate(&isLive); |
2166 if (!_hr->obj_allocated_since_prev_marking(o)) | |
2167 _live_bytes += (o->size() * HeapWordSize); | |
2168 } | |
2169 } | |
2170 size_t live_bytes() { return _live_bytes; } | |
2171 }; | |
2172 | |
2173 class PrintObjsInRegionClosure : public ObjectClosure { | |
2174 HeapRegion *_hr; | |
2175 G1CollectedHeap *_g1; | |
2176 public: | |
2177 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
2178 _g1 = G1CollectedHeap::heap(); | |
2179 }; | |
2180 | |
2181 void do_object(oop o) { | |
2182 if (o != NULL) { | |
2183 HeapWord *start = (HeapWord *) o; | |
2184 size_t word_sz = o->size(); | |
2185 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
2186 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
2187 (void*) o, word_sz, | |
2188 _g1->isMarkedPrev(o), | |
2189 _g1->isMarkedNext(o), | |
2190 _hr->obj_allocated_since_prev_marking(o)); | |
2191 HeapWord *end = start + word_sz; | |
2192 HeapWord *cur; | |
2193 int *val; | |
2194 for (cur = start; cur < end; cur++) { | |
2195 val = (int *) cur; | |
2196 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
2197 } | |
2198 } | |
2199 } | |
2200 }; | |
2201 | |
2202 class VerifyRegionClosure: public HeapRegionClosure { | |
811 | 2203 private: |
342 | 2204 bool _allow_dirty; |
390 | 2205 bool _par; |
811 | 2206 bool _use_prev_marking; |
2207 public: | |
2208 // use_prev_marking == true -> use "prev" marking information, | |
2209 // use_prev_marking == false -> use "next" marking information | |
2210 VerifyRegionClosure(bool allow_dirty, bool par, bool use_prev_marking) | |
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2211 : _allow_dirty(allow_dirty), |
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2212 _par(par), |
811 | 2213 _use_prev_marking(use_prev_marking) {} |
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2214 |
342 | 2215 bool doHeapRegion(HeapRegion* r) { |
390 | 2216 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
2217 "Should be unclaimed at verify points."); | |
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2218 if (!r->continuesHumongous()) { |
811 | 2219 VerifyObjsInRegionClosure not_dead_yet_cl(r, _use_prev_marking); |
2220 r->verify(_allow_dirty, _use_prev_marking); | |
342 | 2221 r->object_iterate(¬_dead_yet_cl); |
2222 guarantee(r->max_live_bytes() >= not_dead_yet_cl.live_bytes(), | |
2223 "More live objects than counted in last complete marking."); | |
2224 } | |
2225 return false; | |
2226 } | |
2227 }; | |
2228 | |
2229 class VerifyRootsClosure: public OopsInGenClosure { | |
2230 private: | |
2231 G1CollectedHeap* _g1h; | |
2232 bool _failures; | |
811 | 2233 bool _use_prev_marking; |
342 | 2234 public: |
811 | 2235 // use_prev_marking == true -> use "prev" marking information, |
2236 // use_prev_marking == false -> use "next" marking information | |
2237 VerifyRootsClosure(bool use_prev_marking) : | |
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2238 _g1h(G1CollectedHeap::heap()), |
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2239 _failures(false), |
811 | 2240 _use_prev_marking(use_prev_marking) { } |
342 | 2241 |
2242 bool failures() { return _failures; } | |
2243 | |
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2244 template <class T> void do_oop_nv(T* p) { |
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2245 T heap_oop = oopDesc::load_heap_oop(p); |
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2246 if (!oopDesc::is_null(heap_oop)) { |
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2247 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
811 | 2248 if (_g1h->is_obj_dead_cond(obj, _use_prev_marking)) { |
342 | 2249 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " |
2250 "points to dead obj "PTR_FORMAT, p, (void*) obj); | |
2251 obj->print_on(gclog_or_tty); | |
2252 _failures = true; | |
2253 } | |
2254 } | |
2255 } | |
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2256 |
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2257 void do_oop(oop* p) { do_oop_nv(p); } |
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2258 void do_oop(narrowOop* p) { do_oop_nv(p); } |
342 | 2259 }; |
2260 | |
390 | 2261 // This is the task used for parallel heap verification. |
2262 | |
2263 class G1ParVerifyTask: public AbstractGangTask { | |
2264 private: | |
2265 G1CollectedHeap* _g1h; | |
2266 bool _allow_dirty; | |
811 | 2267 bool _use_prev_marking; |
390 | 2268 |
2269 public: | |
811 | 2270 // use_prev_marking == true -> use "prev" marking information, |
2271 // use_prev_marking == false -> use "next" marking information | |
2272 G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty, | |
2273 bool use_prev_marking) : | |
390 | 2274 AbstractGangTask("Parallel verify task"), |
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2275 _g1h(g1h), |
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2276 _allow_dirty(allow_dirty), |
811 | 2277 _use_prev_marking(use_prev_marking) { } |
390 | 2278 |
2279 void work(int worker_i) { | |
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2280 HandleMark hm; |
811 | 2281 VerifyRegionClosure blk(_allow_dirty, true, _use_prev_marking); |
390 | 2282 _g1h->heap_region_par_iterate_chunked(&blk, worker_i, |
2283 HeapRegion::ParVerifyClaimValue); | |
2284 } | |
2285 }; | |
2286 | |
342 | 2287 void G1CollectedHeap::verify(bool allow_dirty, bool silent) { |
811 | 2288 verify(allow_dirty, silent, /* use_prev_marking */ true); |
2289 } | |
2290 | |
2291 void G1CollectedHeap::verify(bool allow_dirty, | |
2292 bool silent, | |
2293 bool use_prev_marking) { | |
342 | 2294 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { |
2295 if (!silent) { gclog_or_tty->print("roots "); } | |
811 | 2296 VerifyRootsClosure rootsCl(use_prev_marking); |
342 | 2297 process_strong_roots(false, |
2298 SharedHeap::SO_AllClasses, | |
2299 &rootsCl, | |
2300 &rootsCl); | |
2301 rem_set()->invalidate(perm_gen()->used_region(), false); | |
2302 if (!silent) { gclog_or_tty->print("heapRegions "); } | |
390 | 2303 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
2304 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2305 "sanity check"); | |
2306 | |
811 | 2307 G1ParVerifyTask task(this, allow_dirty, use_prev_marking); |
390 | 2308 int n_workers = workers()->total_workers(); |
2309 set_par_threads(n_workers); | |
2310 workers()->run_task(&task); | |
2311 set_par_threads(0); | |
2312 | |
2313 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), | |
2314 "sanity check"); | |
2315 | |
2316 reset_heap_region_claim_values(); | |
2317 | |
2318 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2319 "sanity check"); | |
2320 } else { | |
811 | 2321 VerifyRegionClosure blk(allow_dirty, false, use_prev_marking); |
390 | 2322 _hrs->iterate(&blk); |
2323 } | |
342 | 2324 if (!silent) gclog_or_tty->print("remset "); |
2325 rem_set()->verify(); | |
2326 guarantee(!rootsCl.failures(), "should not have had failures"); | |
2327 } else { | |
2328 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
2329 } | |
2330 } | |
2331 | |
2332 class PrintRegionClosure: public HeapRegionClosure { | |
2333 outputStream* _st; | |
2334 public: | |
2335 PrintRegionClosure(outputStream* st) : _st(st) {} | |
2336 bool doHeapRegion(HeapRegion* r) { | |
2337 r->print_on(_st); | |
2338 return false; | |
2339 } | |
2340 }; | |
2341 | |
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2342 void G1CollectedHeap::print() const { print_on(tty); } |
342 | 2343 |
2344 void G1CollectedHeap::print_on(outputStream* st) const { | |
838
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2345 print_on(st, PrintHeapAtGCExtended); |
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2346 } |
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2347 |
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2348 void G1CollectedHeap::print_on(outputStream* st, bool extended) const { |
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2349 st->print(" %-20s", "garbage-first heap"); |
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2350 st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
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2351 capacity()/K, used_unlocked()/K); |
838
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2352 st->print(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", |
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2353 _g1_storage.low_boundary(), |
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2354 _g1_storage.high(), |
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2355 _g1_storage.high_boundary()); |
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2356 st->cr(); |
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2357 st->print(" region size " SIZE_FORMAT "K, ", |
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2358 HeapRegion::GrainBytes/K); |
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2359 size_t young_regions = _young_list->length(); |
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2360 st->print(SIZE_FORMAT " young (" SIZE_FORMAT "K), ", |
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2361 young_regions, young_regions * HeapRegion::GrainBytes / K); |
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2362 size_t survivor_regions = g1_policy()->recorded_survivor_regions(); |
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2363 st->print(SIZE_FORMAT " survivors (" SIZE_FORMAT "K)", |
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2364 survivor_regions, survivor_regions * HeapRegion::GrainBytes / K); |
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2365 st->cr(); |
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2366 perm()->as_gen()->print_on(st); |
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2367 if (extended) { |
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2368 print_on_extended(st); |
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2369 } |
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2370 } |
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2371 |
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2372 void G1CollectedHeap::print_on_extended(outputStream* st) const { |
342 | 2373 PrintRegionClosure blk(st); |
2374 _hrs->iterate(&blk); | |
2375 } | |
2376 | |
794 | 2377 class PrintOnThreadsClosure : public ThreadClosure { |
2378 outputStream* _st; | |
2379 public: | |
2380 PrintOnThreadsClosure(outputStream* st) : _st(st) { } | |
2381 virtual void do_thread(Thread *t) { | |
2382 t->print_on(_st); | |
2383 } | |
2384 }; | |
2385 | |
342 | 2386 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { |
2387 if (ParallelGCThreads > 0) { | |
2388 workers()->print_worker_threads(); | |
2389 } | |
2390 st->print("\"G1 concurrent mark GC Thread\" "); | |
2391 _cmThread->print(); | |
2392 st->cr(); | |
794 | 2393 st->print("\"G1 concurrent refinement GC Threads\" "); |
2394 PrintOnThreadsClosure p(st); | |
2395 _cg1r->threads_do(&p); | |
342 | 2396 st->cr(); |
2397 st->print("\"G1 zero-fill GC Thread\" "); | |
2398 _czft->print_on(st); | |
2399 st->cr(); | |
2400 } | |
2401 | |
2402 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
2403 if (ParallelGCThreads > 0) { | |
2404 workers()->threads_do(tc); | |
2405 } | |
2406 tc->do_thread(_cmThread); | |
794 | 2407 _cg1r->threads_do(tc); |
342 | 2408 tc->do_thread(_czft); |
2409 } | |
2410 | |
2411 void G1CollectedHeap::print_tracing_info() const { | |
2412 // We'll overload this to mean "trace GC pause statistics." | |
2413 if (TraceGen0Time || TraceGen1Time) { | |
2414 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
2415 // to that. | |
2416 g1_policy()->print_tracing_info(); | |
2417 } | |
751 | 2418 if (G1SummarizeRSetStats) { |
342 | 2419 g1_rem_set()->print_summary_info(); |
2420 } | |
751 | 2421 if (G1SummarizeConcurrentMark) { |
342 | 2422 concurrent_mark()->print_summary_info(); |
2423 } | |
751 | 2424 if (G1SummarizeZFStats) { |
342 | 2425 ConcurrentZFThread::print_summary_info(); |
2426 } | |
2427 g1_policy()->print_yg_surv_rate_info(); | |
2428 | |
2429 SpecializationStats::print(); | |
2430 } | |
2431 | |
2432 | |
2433 int G1CollectedHeap::addr_to_arena_id(void* addr) const { | |
2434 HeapRegion* hr = heap_region_containing(addr); | |
2435 if (hr == NULL) { | |
2436 return 0; | |
2437 } else { | |
2438 return 1; | |
2439 } | |
2440 } | |
2441 | |
2442 G1CollectedHeap* G1CollectedHeap::heap() { | |
2443 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
2444 "not a garbage-first heap"); | |
2445 return _g1h; | |
2446 } | |
2447 | |
2448 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
2449 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); | |
2450 // Call allocation profiler | |
2451 AllocationProfiler::iterate_since_last_gc(); | |
2452 // Fill TLAB's and such | |
2453 ensure_parsability(true); | |
2454 } | |
2455 | |
2456 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
2457 // FIXME: what is this about? | |
2458 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
2459 // is set. | |
2460 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
2461 "derived pointer present")); | |
2462 } | |
2463 | |
2464 void G1CollectedHeap::do_collection_pause() { | |
2465 // Read the GC count while holding the Heap_lock | |
2466 // we need to do this _before_ wait_for_cleanup_complete(), to | |
2467 // ensure that we do not give up the heap lock and potentially | |
2468 // pick up the wrong count | |
2469 int gc_count_before = SharedHeap::heap()->total_collections(); | |
2470 | |
2471 // Don't want to do a GC pause while cleanup is being completed! | |
2472 wait_for_cleanup_complete(); | |
2473 | |
2474 g1_policy()->record_stop_world_start(); | |
2475 { | |
2476 MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back | |
2477 VM_G1IncCollectionPause op(gc_count_before); | |
2478 VMThread::execute(&op); | |
2479 } | |
2480 } | |
2481 | |
2482 void | |
2483 G1CollectedHeap::doConcurrentMark() { | |
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2484 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
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2485 if (!_cmThread->in_progress()) { |
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2486 _cmThread->set_started(); |
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2487 CGC_lock->notify(); |
342 | 2488 } |
2489 } | |
2490 | |
2491 class VerifyMarkedObjsClosure: public ObjectClosure { | |
2492 G1CollectedHeap* _g1h; | |
2493 public: | |
2494 VerifyMarkedObjsClosure(G1CollectedHeap* g1h) : _g1h(g1h) {} | |
2495 void do_object(oop obj) { | |
2496 assert(obj->mark()->is_marked() ? !_g1h->is_obj_dead(obj) : true, | |
2497 "markandsweep mark should agree with concurrent deadness"); | |
2498 } | |
2499 }; | |
2500 | |
2501 void | |
2502 G1CollectedHeap::checkConcurrentMark() { | |
2503 VerifyMarkedObjsClosure verifycl(this); | |
2504 // MutexLockerEx x(getMarkBitMapLock(), | |
2505 // Mutex::_no_safepoint_check_flag); | |
678 | 2506 object_iterate(&verifycl, false); |
342 | 2507 } |
2508 | |
2509 void G1CollectedHeap::do_sync_mark() { | |
2510 _cm->checkpointRootsInitial(); | |
2511 _cm->markFromRoots(); | |
2512 _cm->checkpointRootsFinal(false); | |
2513 } | |
2514 | |
2515 // <NEW PREDICTION> | |
2516 | |
2517 double G1CollectedHeap::predict_region_elapsed_time_ms(HeapRegion *hr, | |
2518 bool young) { | |
2519 return _g1_policy->predict_region_elapsed_time_ms(hr, young); | |
2520 } | |
2521 | |
2522 void G1CollectedHeap::check_if_region_is_too_expensive(double | |
2523 predicted_time_ms) { | |
2524 _g1_policy->check_if_region_is_too_expensive(predicted_time_ms); | |
2525 } | |
2526 | |
2527 size_t G1CollectedHeap::pending_card_num() { | |
2528 size_t extra_cards = 0; | |
2529 JavaThread *curr = Threads::first(); | |
2530 while (curr != NULL) { | |
2531 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
2532 extra_cards += dcq.size(); | |
2533 curr = curr->next(); | |
2534 } | |
2535 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
2536 size_t buffer_size = dcqs.buffer_size(); | |
2537 size_t buffer_num = dcqs.completed_buffers_num(); | |
2538 return buffer_size * buffer_num + extra_cards; | |
2539 } | |
2540 | |
2541 size_t G1CollectedHeap::max_pending_card_num() { | |
2542 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
2543 size_t buffer_size = dcqs.buffer_size(); | |
2544 size_t buffer_num = dcqs.completed_buffers_num(); | |
2545 int thread_num = Threads::number_of_threads(); | |
2546 return (buffer_num + thread_num) * buffer_size; | |
2547 } | |
2548 | |
2549 size_t G1CollectedHeap::cards_scanned() { | |
2550 HRInto_G1RemSet* g1_rset = (HRInto_G1RemSet*) g1_rem_set(); | |
2551 return g1_rset->cardsScanned(); | |
2552 } | |
2553 | |
2554 void | |
2555 G1CollectedHeap::setup_surviving_young_words() { | |
2556 guarantee( _surviving_young_words == NULL, "pre-condition" ); | |
2557 size_t array_length = g1_policy()->young_cset_length(); | |
2558 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, array_length); | |
2559 if (_surviving_young_words == NULL) { | |
2560 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
2561 "Not enough space for young surv words summary."); | |
2562 } | |
2563 memset(_surviving_young_words, 0, array_length * sizeof(size_t)); | |
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2564 #ifdef ASSERT |
342 | 2565 for (size_t i = 0; i < array_length; ++i) { |
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2566 assert( _surviving_young_words[i] == 0, "memset above" ); |
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2567 } |
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2568 #endif // !ASSERT |
342 | 2569 } |
2570 | |
2571 void | |
2572 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
2573 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
2574 size_t array_length = g1_policy()->young_cset_length(); | |
2575 for (size_t i = 0; i < array_length; ++i) | |
2576 _surviving_young_words[i] += surv_young_words[i]; | |
2577 } | |
2578 | |
2579 void | |
2580 G1CollectedHeap::cleanup_surviving_young_words() { | |
2581 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
2582 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
2583 _surviving_young_words = NULL; | |
2584 } | |
2585 | |
2586 // </NEW PREDICTION> | |
2587 | |
2588 void | |
677 | 2589 G1CollectedHeap::do_collection_pause_at_safepoint() { |
838
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2590 if (PrintHeapAtGC) { |
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2591 Universe::print_heap_before_gc(); |
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2592 } |
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2593 |
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2594 { |
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2595 char verbose_str[128]; |
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2596 sprintf(verbose_str, "GC pause "); |
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2597 if (g1_policy()->in_young_gc_mode()) { |
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2598 if (g1_policy()->full_young_gcs()) |
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2599 strcat(verbose_str, "(young)"); |
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2600 else |
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2601 strcat(verbose_str, "(partial)"); |
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2602 } |
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2603 if (g1_policy()->should_initiate_conc_mark()) |
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2604 strcat(verbose_str, " (initial-mark)"); |
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2605 |
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2606 GCCauseSetter x(this, GCCause::_g1_inc_collection_pause); |
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2607 |
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2608 // if PrintGCDetails is on, we'll print long statistics information |
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2609 // in the collector policy code, so let's not print this as the output |
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2610 // is messy if we do. |
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2611 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
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2612 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); |
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2613 TraceTime t(verbose_str, PrintGC && !PrintGCDetails, true, gclog_or_tty); |
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2614 |
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2615 ResourceMark rm; |
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2616 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); |
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2617 assert(Thread::current() == VMThread::vm_thread(), "should be in vm thread"); |
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2618 guarantee(!is_gc_active(), "collection is not reentrant"); |
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2619 assert(regions_accounted_for(), "Region leakage!"); |
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2620 |
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2621 increment_gc_time_stamp(); |
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2622 |
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2623 if (g1_policy()->in_young_gc_mode()) { |
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2624 assert(check_young_list_well_formed(), |
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2625 "young list should be well formed"); |
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2626 } |
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2627 |
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2628 if (GC_locker::is_active()) { |
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2629 return; // GC is disabled (e.g. JNI GetXXXCritical operation) |
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2630 } |
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2631 |
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2632 bool abandoned = false; |
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2633 { // Call to jvmpi::post_class_unload_events must occur outside of active GC |
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2634 IsGCActiveMark x; |
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2635 |
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2636 gc_prologue(false); |
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2637 increment_total_collections(false /* full gc */); |
342 | 2638 |
2639 #if G1_REM_SET_LOGGING | |
838
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2640 gclog_or_tty->print_cr("\nJust chose CS, heap:"); |
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2641 print(); |
342 | 2642 #endif |
2643 | |
838
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2644 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { |
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2645 HandleMark hm; // Discard invalid handles created during verification |
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2646 prepare_for_verify(); |
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2647 gclog_or_tty->print(" VerifyBeforeGC:"); |
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2648 Universe::verify(false); |
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2649 } |
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2650 |
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2651 COMPILER2_PRESENT(DerivedPointerTable::clear()); |
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2652 |
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2653 // We want to turn off ref discovery, if necessary, and turn it back on |
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2654 // on again later if we do. XXX Dubious: why is discovery disabled? |
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2655 bool was_enabled = ref_processor()->discovery_enabled(); |
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2656 if (was_enabled) ref_processor()->disable_discovery(); |
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2657 |
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2658 // Forget the current alloc region (we might even choose it to be part |
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2659 // of the collection set!). |
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2660 abandon_cur_alloc_region(); |
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2661 |
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2662 // The elapsed time induced by the start time below deliberately elides |
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2663 // the possible verification above. |
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2664 double start_time_sec = os::elapsedTime(); |
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2665 size_t start_used_bytes = used(); |
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2666 |
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2667 g1_policy()->record_collection_pause_start(start_time_sec, |
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2668 start_used_bytes); |
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2669 |
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|
2670 guarantee(_in_cset_fast_test == NULL, "invariant"); |
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2671 guarantee(_in_cset_fast_test_base == NULL, "invariant"); |
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2672 _in_cset_fast_test_length = max_regions(); |
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2673 _in_cset_fast_test_base = |
526 | 2674 NEW_C_HEAP_ARRAY(bool, _in_cset_fast_test_length); |
838
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2675 memset(_in_cset_fast_test_base, false, |
526 | 2676 _in_cset_fast_test_length * sizeof(bool)); |
838
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2677 // We're biasing _in_cset_fast_test to avoid subtracting the |
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2678 // beginning of the heap every time we want to index; basically |
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2679 // it's the same with what we do with the card table. |
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2680 _in_cset_fast_test = _in_cset_fast_test_base - |
526 | 2681 ((size_t) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); |
2682 | |
342 | 2683 #if SCAN_ONLY_VERBOSE |
838
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2684 _young_list->print(); |
342 | 2685 #endif // SCAN_ONLY_VERBOSE |
2686 | |
838
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2687 if (g1_policy()->should_initiate_conc_mark()) { |
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2688 concurrent_mark()->checkpointRootsInitialPre(); |
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2689 } |
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2690 save_marks(); |
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2691 |
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2692 // We must do this before any possible evacuation that should propagate |
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2693 // marks. |
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2694 if (mark_in_progress()) { |
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2695 double start_time_sec = os::elapsedTime(); |
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2696 |
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2697 _cm->drainAllSATBBuffers(); |
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2698 double finish_mark_ms = (os::elapsedTime() - start_time_sec) * 1000.0; |
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2699 g1_policy()->record_satb_drain_time(finish_mark_ms); |
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2700 } |
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|
2701 // Record the number of elements currently on the mark stack, so we |
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2702 // only iterate over these. (Since evacuation may add to the mark |
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2703 // stack, doing more exposes race conditions.) If no mark is in |
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2704 // progress, this will be zero. |
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2705 _cm->set_oops_do_bound(); |
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2706 |
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|
2707 assert(regions_accounted_for(), "Region leakage."); |
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2708 |
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2709 if (mark_in_progress()) |
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2710 concurrent_mark()->newCSet(); |
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2711 |
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2712 // Now choose the CS. |
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2713 g1_policy()->choose_collection_set(); |
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2714 |
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2715 // We may abandon a pause if we find no region that will fit in the MMU |
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2716 // pause. |
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2717 bool abandoned = (g1_policy()->collection_set() == NULL); |
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2718 |
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2719 // Nothing to do if we were unable to choose a collection set. |
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2720 if (!abandoned) { |
342 | 2721 #if G1_REM_SET_LOGGING |
838
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2722 gclog_or_tty->print_cr("\nAfter pause, heap:"); |
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2723 print(); |
342 | 2724 #endif |
2725 | |
838
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2726 setup_surviving_young_words(); |
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2727 |
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2728 // Set up the gc allocation regions. |
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2729 get_gc_alloc_regions(); |
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2730 |
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|
2731 // Actually do the work... |
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2732 evacuate_collection_set(); |
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2733 free_collection_set(g1_policy()->collection_set()); |
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2734 g1_policy()->clear_collection_set(); |
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2735 |
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|
2736 FREE_C_HEAP_ARRAY(bool, _in_cset_fast_test_base); |
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2737 // this is more for peace of mind; we're nulling them here and |
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2738 // we're expecting them to be null at the beginning of the next GC |
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2739 _in_cset_fast_test = NULL; |
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2740 _in_cset_fast_test_base = NULL; |
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|
2741 |
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|
2742 cleanup_surviving_young_words(); |
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|
2743 |
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|
2744 if (g1_policy()->in_young_gc_mode()) { |
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|
2745 _young_list->reset_sampled_info(); |
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2746 assert(check_young_list_empty(true), |
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|
2747 "young list should be empty"); |
342 | 2748 |
2749 #if SCAN_ONLY_VERBOSE | |
838
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|
2750 _young_list->print(); |
342 | 2751 #endif // SCAN_ONLY_VERBOSE |
2752 | |
838
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|
2753 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
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|
2754 _young_list->first_survivor_region(), |
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|
2755 _young_list->last_survivor_region()); |
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|
2756 _young_list->reset_auxilary_lists(); |
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|
2757 } |
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|
2758 } else { |
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|
2759 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
342 | 2760 } |
838
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|
2761 |
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|
2762 if (evacuation_failed()) { |
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2763 _summary_bytes_used = recalculate_used(); |
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|
2764 } else { |
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|
2765 // The "used" of the the collection set have already been subtracted |
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2766 // when they were freed. Add in the bytes evacuated. |
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|
2767 _summary_bytes_used += g1_policy()->bytes_in_to_space(); |
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|
2768 } |
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|
2769 |
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|
2770 if (g1_policy()->in_young_gc_mode() && |
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|
2771 g1_policy()->should_initiate_conc_mark()) { |
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2772 concurrent_mark()->checkpointRootsInitialPost(); |
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|
2773 set_marking_started(); |
845
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2774 // CAUTION: after the doConcurrentMark() call below, |
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|
2775 // the concurrent marking thread(s) could be running |
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|
2776 // concurrently with us. Make sure that anything after |
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2777 // this point does not assume that we are the only GC thread |
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2778 // running. Note: of course, the actual marking work will |
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|
2779 // not start until the safepoint itself is released in |
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|
2780 // ConcurrentGCThread::safepoint_desynchronize(). |
838
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2781 doConcurrentMark(); |
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2782 } |
342 | 2783 |
2784 #if SCAN_ONLY_VERBOSE | |
838
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|
2785 _young_list->print(); |
342 | 2786 #endif // SCAN_ONLY_VERBOSE |
2787 | |
838
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|
2788 double end_time_sec = os::elapsedTime(); |
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2789 double pause_time_ms = (end_time_sec - start_time_sec) * MILLIUNITS; |
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|
2790 g1_policy()->record_pause_time_ms(pause_time_ms); |
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|
2791 g1_policy()->record_collection_pause_end(abandoned); |
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2792 |
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|
2793 assert(regions_accounted_for(), "Region leakage."); |
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2794 |
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2795 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { |
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2796 HandleMark hm; // Discard invalid handles created during verification |
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2797 gclog_or_tty->print(" VerifyAfterGC:"); |
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2798 prepare_for_verify(); |
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2799 Universe::verify(false); |
342 | 2800 } |
838
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2801 |
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2802 if (was_enabled) ref_processor()->enable_discovery(); |
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2803 |
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2804 { |
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2805 size_t expand_bytes = g1_policy()->expansion_amount(); |
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2806 if (expand_bytes > 0) { |
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2807 size_t bytes_before = capacity(); |
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2808 expand(expand_bytes); |
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2809 } |
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2810 } |
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2811 |
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2812 if (mark_in_progress()) { |
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2813 concurrent_mark()->update_g1_committed(); |
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2814 } |
546
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2815 |
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2816 #ifdef TRACESPINNING |
838
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2817 ParallelTaskTerminator::print_termination_counts(); |
546
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2818 #endif |
342 | 2819 |
838
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2820 gc_epilogue(false); |
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2821 } |
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2822 |
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2823 assert(verify_region_lists(), "Bad region lists."); |
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2824 |
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2825 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
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2826 gclog_or_tty->print_cr("Stopping after GC #%d", ExitAfterGCNum); |
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2827 print_tracing_info(); |
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2828 vm_exit(-1); |
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2829 } |
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2830 } |
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2831 |
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2832 if (PrintHeapAtGC) { |
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2833 Universe::print_heap_after_gc(); |
342 | 2834 } |
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2835 if (G1SummarizeRSetStats && |
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2836 (G1SummarizeRSetStatsPeriod > 0) && |
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2837 (total_collections() % G1SummarizeRSetStatsPeriod == 0)) { |
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2838 g1_rem_set()->print_summary_info(); |
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2839 } |
342 | 2840 } |
2841 | |
2842 void G1CollectedHeap::set_gc_alloc_region(int purpose, HeapRegion* r) { | |
2843 assert(purpose >= 0 && purpose < GCAllocPurposeCount, "invalid purpose"); | |
636 | 2844 // make sure we don't call set_gc_alloc_region() multiple times on |
2845 // the same region | |
2846 assert(r == NULL || !r->is_gc_alloc_region(), | |
2847 "shouldn't already be a GC alloc region"); | |
342 | 2848 HeapWord* original_top = NULL; |
2849 if (r != NULL) | |
2850 original_top = r->top(); | |
2851 | |
2852 // We will want to record the used space in r as being there before gc. | |
2853 // One we install it as a GC alloc region it's eligible for allocation. | |
2854 // So record it now and use it later. | |
2855 size_t r_used = 0; | |
2856 if (r != NULL) { | |
2857 r_used = r->used(); | |
2858 | |
2859 if (ParallelGCThreads > 0) { | |
2860 // need to take the lock to guard against two threads calling | |
2861 // get_gc_alloc_region concurrently (very unlikely but...) | |
2862 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
2863 r->save_marks(); | |
2864 } | |
2865 } | |
2866 HeapRegion* old_alloc_region = _gc_alloc_regions[purpose]; | |
2867 _gc_alloc_regions[purpose] = r; | |
2868 if (old_alloc_region != NULL) { | |
2869 // Replace aliases too. | |
2870 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
2871 if (_gc_alloc_regions[ap] == old_alloc_region) { | |
2872 _gc_alloc_regions[ap] = r; | |
2873 } | |
2874 } | |
2875 } | |
2876 if (r != NULL) { | |
2877 push_gc_alloc_region(r); | |
2878 if (mark_in_progress() && original_top != r->next_top_at_mark_start()) { | |
2879 // We are using a region as a GC alloc region after it has been used | |
2880 // as a mutator allocation region during the current marking cycle. | |
2881 // The mutator-allocated objects are currently implicitly marked, but | |
2882 // when we move hr->next_top_at_mark_start() forward at the the end | |
2883 // of the GC pause, they won't be. We therefore mark all objects in | |
2884 // the "gap". We do this object-by-object, since marking densely | |
2885 // does not currently work right with marking bitmap iteration. This | |
2886 // means we rely on TLAB filling at the start of pauses, and no | |
2887 // "resuscitation" of filled TLAB's. If we want to do this, we need | |
2888 // to fix the marking bitmap iteration. | |
2889 HeapWord* curhw = r->next_top_at_mark_start(); | |
2890 HeapWord* t = original_top; | |
2891 | |
2892 while (curhw < t) { | |
2893 oop cur = (oop)curhw; | |
2894 // We'll assume parallel for generality. This is rare code. | |
2895 concurrent_mark()->markAndGrayObjectIfNecessary(cur); // can't we just mark them? | |
2896 curhw = curhw + cur->size(); | |
2897 } | |
2898 assert(curhw == t, "Should have parsed correctly."); | |
2899 } | |
2900 if (G1PolicyVerbose > 1) { | |
2901 gclog_or_tty->print("New alloc region ["PTR_FORMAT", "PTR_FORMAT", " PTR_FORMAT") " | |
2902 "for survivors:", r->bottom(), original_top, r->end()); | |
2903 r->print(); | |
2904 } | |
2905 g1_policy()->record_before_bytes(r_used); | |
2906 } | |
2907 } | |
2908 | |
2909 void G1CollectedHeap::push_gc_alloc_region(HeapRegion* hr) { | |
2910 assert(Thread::current()->is_VM_thread() || | |
2911 par_alloc_during_gc_lock()->owned_by_self(), "Precondition"); | |
2912 assert(!hr->is_gc_alloc_region() && !hr->in_collection_set(), | |
2913 "Precondition."); | |
2914 hr->set_is_gc_alloc_region(true); | |
2915 hr->set_next_gc_alloc_region(_gc_alloc_region_list); | |
2916 _gc_alloc_region_list = hr; | |
2917 } | |
2918 | |
2919 #ifdef G1_DEBUG | |
2920 class FindGCAllocRegion: public HeapRegionClosure { | |
2921 public: | |
2922 bool doHeapRegion(HeapRegion* r) { | |
2923 if (r->is_gc_alloc_region()) { | |
2924 gclog_or_tty->print_cr("Region %d ["PTR_FORMAT"...] is still a gc_alloc_region.", | |
2925 r->hrs_index(), r->bottom()); | |
2926 } | |
2927 return false; | |
2928 } | |
2929 }; | |
2930 #endif // G1_DEBUG | |
2931 | |
2932 void G1CollectedHeap::forget_alloc_region_list() { | |
2933 assert(Thread::current()->is_VM_thread(), "Precondition"); | |
2934 while (_gc_alloc_region_list != NULL) { | |
2935 HeapRegion* r = _gc_alloc_region_list; | |
2936 assert(r->is_gc_alloc_region(), "Invariant."); | |
637
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2937 // We need HeapRegion::oops_on_card_seq_iterate_careful() to work on |
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2938 // newly allocated data in order to be able to apply deferred updates |
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2939 // before the GC is done for verification purposes (i.e to allow |
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2940 // G1HRRSFlushLogBuffersOnVerify). It's safe thing to do after the |
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2941 // collection. |
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2942 r->ContiguousSpace::set_saved_mark(); |
342 | 2943 _gc_alloc_region_list = r->next_gc_alloc_region(); |
2944 r->set_next_gc_alloc_region(NULL); | |
2945 r->set_is_gc_alloc_region(false); | |
545 | 2946 if (r->is_survivor()) { |
2947 if (r->is_empty()) { | |
2948 r->set_not_young(); | |
2949 } else { | |
2950 _young_list->add_survivor_region(r); | |
2951 } | |
2952 } | |
342 | 2953 if (r->is_empty()) { |
2954 ++_free_regions; | |
2955 } | |
2956 } | |
2957 #ifdef G1_DEBUG | |
2958 FindGCAllocRegion fa; | |
2959 heap_region_iterate(&fa); | |
2960 #endif // G1_DEBUG | |
2961 } | |
2962 | |
2963 | |
2964 bool G1CollectedHeap::check_gc_alloc_regions() { | |
2965 // TODO: allocation regions check | |
2966 return true; | |
2967 } | |
2968 | |
2969 void G1CollectedHeap::get_gc_alloc_regions() { | |
636 | 2970 // First, let's check that the GC alloc region list is empty (it should) |
2971 assert(_gc_alloc_region_list == NULL, "invariant"); | |
2972 | |
342 | 2973 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
636 | 2974 assert(_gc_alloc_regions[ap] == NULL, "invariant"); |
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2975 assert(_gc_alloc_region_counts[ap] == 0, "invariant"); |
636 | 2976 |
342 | 2977 // Create new GC alloc regions. |
636 | 2978 HeapRegion* alloc_region = _retained_gc_alloc_regions[ap]; |
2979 _retained_gc_alloc_regions[ap] = NULL; | |
2980 | |
2981 if (alloc_region != NULL) { | |
2982 assert(_retain_gc_alloc_region[ap], "only way to retain a GC region"); | |
2983 | |
2984 // let's make sure that the GC alloc region is not tagged as such | |
2985 // outside a GC operation | |
2986 assert(!alloc_region->is_gc_alloc_region(), "sanity"); | |
2987 | |
2988 if (alloc_region->in_collection_set() || | |
2989 alloc_region->top() == alloc_region->end() || | |
2990 alloc_region->top() == alloc_region->bottom()) { | |
2991 // we will discard the current GC alloc region if it's in the | |
2992 // collection set (it can happen!), if it's already full (no | |
2993 // point in using it), or if it's empty (this means that it | |
2994 // was emptied during a cleanup and it should be on the free | |
2995 // list now). | |
2996 | |
2997 alloc_region = NULL; | |
2998 } | |
2999 } | |
3000 | |
3001 if (alloc_region == NULL) { | |
3002 // we will get a new GC alloc region | |
342 | 3003 alloc_region = newAllocRegionWithExpansion(ap, 0); |
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3004 } else { |
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3005 // the region was retained from the last collection |
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3006 ++_gc_alloc_region_counts[ap]; |
342 | 3007 } |
636 | 3008 |
342 | 3009 if (alloc_region != NULL) { |
636 | 3010 assert(_gc_alloc_regions[ap] == NULL, "pre-condition"); |
342 | 3011 set_gc_alloc_region(ap, alloc_region); |
3012 } | |
636 | 3013 |
3014 assert(_gc_alloc_regions[ap] == NULL || | |
3015 _gc_alloc_regions[ap]->is_gc_alloc_region(), | |
3016 "the GC alloc region should be tagged as such"); | |
3017 assert(_gc_alloc_regions[ap] == NULL || | |
3018 _gc_alloc_regions[ap] == _gc_alloc_region_list, | |
3019 "the GC alloc region should be the same as the GC alloc list head"); | |
342 | 3020 } |
3021 // Set alternative regions for allocation purposes that have reached | |
636 | 3022 // their limit. |
342 | 3023 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
3024 GCAllocPurpose alt_purpose = g1_policy()->alternative_purpose(ap); | |
3025 if (_gc_alloc_regions[ap] == NULL && alt_purpose != ap) { | |
3026 _gc_alloc_regions[ap] = _gc_alloc_regions[alt_purpose]; | |
3027 } | |
3028 } | |
3029 assert(check_gc_alloc_regions(), "alloc regions messed up"); | |
3030 } | |
3031 | |
636 | 3032 void G1CollectedHeap::release_gc_alloc_regions(bool totally) { |
342 | 3033 // We keep a separate list of all regions that have been alloc regions in |
636 | 3034 // the current collection pause. Forget that now. This method will |
3035 // untag the GC alloc regions and tear down the GC alloc region | |
3036 // list. It's desirable that no regions are tagged as GC alloc | |
3037 // outside GCs. | |
342 | 3038 forget_alloc_region_list(); |
3039 | |
3040 // The current alloc regions contain objs that have survived | |
3041 // collection. Make them no longer GC alloc regions. | |
3042 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
3043 HeapRegion* r = _gc_alloc_regions[ap]; | |
636 | 3044 _retained_gc_alloc_regions[ap] = NULL; |
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3045 _gc_alloc_region_counts[ap] = 0; |
636 | 3046 |
3047 if (r != NULL) { | |
3048 // we retain nothing on _gc_alloc_regions between GCs | |
3049 set_gc_alloc_region(ap, NULL); | |
3050 | |
3051 if (r->is_empty()) { | |
3052 // we didn't actually allocate anything in it; let's just put | |
3053 // it on the free list | |
342 | 3054 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); |
3055 r->set_zero_fill_complete(); | |
3056 put_free_region_on_list_locked(r); | |
636 | 3057 } else if (_retain_gc_alloc_region[ap] && !totally) { |
3058 // retain it so that we can use it at the beginning of the next GC | |
3059 _retained_gc_alloc_regions[ap] = r; | |
342 | 3060 } |
3061 } | |
636 | 3062 } |
3063 } | |
3064 | |
3065 #ifndef PRODUCT | |
3066 // Useful for debugging | |
3067 | |
3068 void G1CollectedHeap::print_gc_alloc_regions() { | |
3069 gclog_or_tty->print_cr("GC alloc regions"); | |
3070 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
3071 HeapRegion* r = _gc_alloc_regions[ap]; | |
3072 if (r == NULL) { | |
3073 gclog_or_tty->print_cr(" %2d : "PTR_FORMAT, ap, NULL); | |
3074 } else { | |
3075 gclog_or_tty->print_cr(" %2d : "PTR_FORMAT" "SIZE_FORMAT, | |
3076 ap, r->bottom(), r->used()); | |
3077 } | |
3078 } | |
3079 } | |
3080 #endif // PRODUCT | |
342 | 3081 |
3082 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
3083 _drain_in_progress = false; | |
3084 set_evac_failure_closure(cl); | |
3085 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
3086 } | |
3087 | |
3088 void G1CollectedHeap::finalize_for_evac_failure() { | |
3089 assert(_evac_failure_scan_stack != NULL && | |
3090 _evac_failure_scan_stack->length() == 0, | |
3091 "Postcondition"); | |
3092 assert(!_drain_in_progress, "Postcondition"); | |
3093 // Don't have to delete, since the scan stack is a resource object. | |
3094 _evac_failure_scan_stack = NULL; | |
3095 } | |
3096 | |
3097 | |
3098 | |
3099 // *** Sequential G1 Evacuation | |
3100 | |
3101 HeapWord* G1CollectedHeap::allocate_during_gc(GCAllocPurpose purpose, size_t word_size) { | |
3102 HeapRegion* alloc_region = _gc_alloc_regions[purpose]; | |
3103 // let the caller handle alloc failure | |
3104 if (alloc_region == NULL) return NULL; | |
3105 assert(isHumongous(word_size) || !alloc_region->isHumongous(), | |
3106 "Either the object is humongous or the region isn't"); | |
3107 HeapWord* block = alloc_region->allocate(word_size); | |
3108 if (block == NULL) { | |
3109 block = allocate_during_gc_slow(purpose, alloc_region, false, word_size); | |
3110 } | |
3111 return block; | |
3112 } | |
3113 | |
3114 class G1IsAliveClosure: public BoolObjectClosure { | |
3115 G1CollectedHeap* _g1; | |
3116 public: | |
3117 G1IsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
3118 void do_object(oop p) { assert(false, "Do not call."); } | |
3119 bool do_object_b(oop p) { | |
3120 // It is reachable if it is outside the collection set, or is inside | |
3121 // and forwarded. | |
3122 | |
3123 #ifdef G1_DEBUG | |
3124 gclog_or_tty->print_cr("is alive "PTR_FORMAT" in CS %d forwarded %d overall %d", | |
3125 (void*) p, _g1->obj_in_cs(p), p->is_forwarded(), | |
3126 !_g1->obj_in_cs(p) || p->is_forwarded()); | |
3127 #endif // G1_DEBUG | |
3128 | |
3129 return !_g1->obj_in_cs(p) || p->is_forwarded(); | |
3130 } | |
3131 }; | |
3132 | |
3133 class G1KeepAliveClosure: public OopClosure { | |
3134 G1CollectedHeap* _g1; | |
3135 public: | |
3136 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
845
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3137 void do_oop(narrowOop* p) { guarantee(false, "Not needed"); } |
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3138 void do_oop( oop* p) { |
342 | 3139 oop obj = *p; |
3140 #ifdef G1_DEBUG | |
3141 if (PrintGC && Verbose) { | |
3142 gclog_or_tty->print_cr("keep alive *"PTR_FORMAT" = "PTR_FORMAT" "PTR_FORMAT, | |
3143 p, (void*) obj, (void*) *p); | |
3144 } | |
3145 #endif // G1_DEBUG | |
3146 | |
3147 if (_g1->obj_in_cs(obj)) { | |
3148 assert( obj->is_forwarded(), "invariant" ); | |
3149 *p = obj->forwardee(); | |
3150 #ifdef G1_DEBUG | |
3151 gclog_or_tty->print_cr(" in CSet: moved "PTR_FORMAT" -> "PTR_FORMAT, | |
3152 (void*) obj, (void*) *p); | |
3153 #endif // G1_DEBUG | |
3154 } | |
3155 } | |
3156 }; | |
3157 | |
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3158 class UpdateRSetImmediate : public OopsInHeapRegionClosure { |
342 | 3159 private: |
3160 G1CollectedHeap* _g1; | |
3161 G1RemSet* _g1_rem_set; | |
3162 public: | |
616
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3163 UpdateRSetImmediate(G1CollectedHeap* g1) : |
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3164 _g1(g1), _g1_rem_set(g1->g1_rem_set()) {} |
342 | 3165 |
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3166 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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3167 virtual void do_oop( oop* p) { do_oop_work(p); } |
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3168 template <class T> void do_oop_work(T* p) { |
342 | 3169 assert(_from->is_in_reserved(p), "paranoia"); |
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3170 T heap_oop = oopDesc::load_heap_oop(p); |
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3171 if (!oopDesc::is_null(heap_oop) && !_from->is_survivor()) { |
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3172 _g1_rem_set->par_write_ref(_from, p, 0); |
342 | 3173 } |
3174 } | |
3175 }; | |
3176 | |
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3177 class UpdateRSetDeferred : public OopsInHeapRegionClosure { |
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3178 private: |
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3179 G1CollectedHeap* _g1; |
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3180 DirtyCardQueue *_dcq; |
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3181 CardTableModRefBS* _ct_bs; |
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3182 |
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3183 public: |
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3184 UpdateRSetDeferred(G1CollectedHeap* g1, DirtyCardQueue* dcq) : |
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3185 _g1(g1), _ct_bs((CardTableModRefBS*)_g1->barrier_set()), _dcq(dcq) {} |
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3186 |
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3187 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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3188 virtual void do_oop( oop* p) { do_oop_work(p); } |
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3189 template <class T> void do_oop_work(T* p) { |
616
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3190 assert(_from->is_in_reserved(p), "paranoia"); |
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3191 if (!_from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && |
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3192 !_from->is_survivor()) { |
616
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3193 size_t card_index = _ct_bs->index_for(p); |
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3194 if (_ct_bs->mark_card_deferred(card_index)) { |
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3195 _dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index)); |
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3196 } |
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3197 } |
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3198 } |
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3199 }; |
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3200 |
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3201 |
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3202 |
342 | 3203 class RemoveSelfPointerClosure: public ObjectClosure { |
3204 private: | |
3205 G1CollectedHeap* _g1; | |
3206 ConcurrentMark* _cm; | |
3207 HeapRegion* _hr; | |
3208 size_t _prev_marked_bytes; | |
3209 size_t _next_marked_bytes; | |
616
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3210 OopsInHeapRegionClosure *_cl; |
342 | 3211 public: |
616
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3212 RemoveSelfPointerClosure(G1CollectedHeap* g1, OopsInHeapRegionClosure* cl) : |
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3213 _g1(g1), _cm(_g1->concurrent_mark()), _prev_marked_bytes(0), |
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3214 _next_marked_bytes(0), _cl(cl) {} |
342 | 3215 |
3216 size_t prev_marked_bytes() { return _prev_marked_bytes; } | |
3217 size_t next_marked_bytes() { return _next_marked_bytes; } | |
3218 | |
352
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3219 // The original idea here was to coalesce evacuated and dead objects. |
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3220 // However that caused complications with the block offset table (BOT). |
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3221 // In particular if there were two TLABs, one of them partially refined. |
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3222 // |----- TLAB_1--------|----TLAB_2-~~~(partially refined part)~~~| |
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3223 // The BOT entries of the unrefined part of TLAB_2 point to the start |
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3224 // of TLAB_2. If the last object of the TLAB_1 and the first object |
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3225 // of TLAB_2 are coalesced, then the cards of the unrefined part |
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3226 // would point into middle of the filler object. |
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3227 // |
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3228 // The current approach is to not coalesce and leave the BOT contents intact. |
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3229 void do_object(oop obj) { |
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3230 if (obj->is_forwarded() && obj->forwardee() == obj) { |
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3231 // The object failed to move. |
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3232 assert(!_g1->is_obj_dead(obj), "We should not be preserving dead objs."); |
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3233 _cm->markPrev(obj); |
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3234 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
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3235 _prev_marked_bytes += (obj->size() * HeapWordSize); |
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3236 if (_g1->mark_in_progress() && !_g1->is_obj_ill(obj)) { |
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3237 _cm->markAndGrayObjectIfNecessary(obj); |
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3238 } |
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3239 obj->set_mark(markOopDesc::prototype()); |
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3240 // While we were processing RSet buffers during the |
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3241 // collection, we actually didn't scan any cards on the |
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3242 // collection set, since we didn't want to update remebered |
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3243 // sets with entries that point into the collection set, given |
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3244 // that live objects fromthe collection set are about to move |
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3245 // and such entries will be stale very soon. This change also |
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3246 // dealt with a reliability issue which involved scanning a |
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3247 // card in the collection set and coming across an array that |
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3248 // was being chunked and looking malformed. The problem is |
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3249 // that, if evacuation fails, we might have remembered set |
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3250 // entries missing given that we skipped cards on the |
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3251 // collection set. So, we'll recreate such entries now. |
616
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3252 obj->oop_iterate(_cl); |
352
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3253 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
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3254 } else { |
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3255 // The object has been either evacuated or is dead. Fill it with a |
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3256 // dummy object. |
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3257 MemRegion mr((HeapWord*)obj, obj->size()); |
481
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3258 CollectedHeap::fill_with_object(mr); |
342 | 3259 _cm->clearRangeBothMaps(mr); |
3260 } | |
3261 } | |
3262 }; | |
3263 | |
3264 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
616
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3265 UpdateRSetImmediate immediate_update(_g1h); |
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3266 DirtyCardQueue dcq(&_g1h->dirty_card_queue_set()); |
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3267 UpdateRSetDeferred deferred_update(_g1h, &dcq); |
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3268 OopsInHeapRegionClosure *cl; |
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3269 if (G1DeferredRSUpdate) { |
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3270 cl = &deferred_update; |
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3271 } else { |
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3272 cl = &immediate_update; |
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3273 } |
342 | 3274 HeapRegion* cur = g1_policy()->collection_set(); |
3275 while (cur != NULL) { | |
3276 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
3277 | |
616
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3278 RemoveSelfPointerClosure rspc(_g1h, cl); |
342 | 3279 if (cur->evacuation_failed()) { |
3280 assert(cur->in_collection_set(), "bad CS"); | |
616
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3281 cl->set_region(cur); |
342 | 3282 cur->object_iterate(&rspc); |
3283 | |
3284 // A number of manipulations to make the TAMS be the current top, | |
3285 // and the marked bytes be the ones observed in the iteration. | |
3286 if (_g1h->concurrent_mark()->at_least_one_mark_complete()) { | |
3287 // The comments below are the postconditions achieved by the | |
3288 // calls. Note especially the last such condition, which says that | |
3289 // the count of marked bytes has been properly restored. | |
3290 cur->note_start_of_marking(false); | |
3291 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
3292 cur->add_to_marked_bytes(rspc.prev_marked_bytes()); | |
3293 // _next_marked_bytes == prev_marked_bytes. | |
3294 cur->note_end_of_marking(); | |
3295 // _prev_top_at_mark_start == top(), | |
3296 // _prev_marked_bytes == prev_marked_bytes | |
3297 } | |
3298 // If there is no mark in progress, we modified the _next variables | |
3299 // above needlessly, but harmlessly. | |
3300 if (_g1h->mark_in_progress()) { | |
3301 cur->note_start_of_marking(false); | |
3302 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
3303 // _next_marked_bytes == next_marked_bytes. | |
3304 } | |
3305 | |
3306 // Now make sure the region has the right index in the sorted array. | |
3307 g1_policy()->note_change_in_marked_bytes(cur); | |
3308 } | |
3309 cur = cur->next_in_collection_set(); | |
3310 } | |
3311 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
3312 | |
3313 // Now restore saved marks, if any. | |
3314 if (_objs_with_preserved_marks != NULL) { | |
3315 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
3316 assert(_objs_with_preserved_marks->length() == | |
3317 _preserved_marks_of_objs->length(), "Both or none."); | |
3318 guarantee(_objs_with_preserved_marks->length() == | |
3319 _preserved_marks_of_objs->length(), "Both or none."); | |
3320 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
3321 oop obj = _objs_with_preserved_marks->at(i); | |
3322 markOop m = _preserved_marks_of_objs->at(i); | |
3323 obj->set_mark(m); | |
3324 } | |
3325 // Delete the preserved marks growable arrays (allocated on the C heap). | |
3326 delete _objs_with_preserved_marks; | |
3327 delete _preserved_marks_of_objs; | |
3328 _objs_with_preserved_marks = NULL; | |
3329 _preserved_marks_of_objs = NULL; | |
3330 } | |
3331 } | |
3332 | |
3333 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
3334 _evac_failure_scan_stack->push(obj); | |
3335 } | |
3336 | |
3337 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
3338 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
3339 | |
3340 while (_evac_failure_scan_stack->length() > 0) { | |
3341 oop obj = _evac_failure_scan_stack->pop(); | |
3342 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
3343 obj->oop_iterate_backwards(_evac_failure_closure); | |
3344 } | |
3345 } | |
3346 | |
3347 void G1CollectedHeap::handle_evacuation_failure(oop old) { | |
3348 markOop m = old->mark(); | |
3349 // forward to self | |
3350 assert(!old->is_forwarded(), "precondition"); | |
3351 | |
3352 old->forward_to(old); | |
3353 handle_evacuation_failure_common(old, m); | |
3354 } | |
3355 | |
3356 oop | |
3357 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
3358 oop old) { | |
3359 markOop m = old->mark(); | |
3360 oop forward_ptr = old->forward_to_atomic(old); | |
3361 if (forward_ptr == NULL) { | |
3362 // Forward-to-self succeeded. | |
3363 if (_evac_failure_closure != cl) { | |
3364 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
3365 assert(!_drain_in_progress, | |
3366 "Should only be true while someone holds the lock."); | |
3367 // Set the global evac-failure closure to the current thread's. | |
3368 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
3369 set_evac_failure_closure(cl); | |
3370 // Now do the common part. | |
3371 handle_evacuation_failure_common(old, m); | |
3372 // Reset to NULL. | |
3373 set_evac_failure_closure(NULL); | |
3374 } else { | |
3375 // The lock is already held, and this is recursive. | |
3376 assert(_drain_in_progress, "This should only be the recursive case."); | |
3377 handle_evacuation_failure_common(old, m); | |
3378 } | |
3379 return old; | |
3380 } else { | |
3381 // Someone else had a place to copy it. | |
3382 return forward_ptr; | |
3383 } | |
3384 } | |
3385 | |
3386 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
3387 set_evacuation_failed(true); | |
3388 | |
3389 preserve_mark_if_necessary(old, m); | |
3390 | |
3391 HeapRegion* r = heap_region_containing(old); | |
3392 if (!r->evacuation_failed()) { | |
3393 r->set_evacuation_failed(true); | |
751 | 3394 if (G1PrintRegions) { |
342 | 3395 gclog_or_tty->print("evacuation failed in heap region "PTR_FORMAT" " |
3396 "["PTR_FORMAT","PTR_FORMAT")\n", | |
3397 r, r->bottom(), r->end()); | |
3398 } | |
3399 } | |
3400 | |
3401 push_on_evac_failure_scan_stack(old); | |
3402 | |
3403 if (!_drain_in_progress) { | |
3404 // prevent recursion in copy_to_survivor_space() | |
3405 _drain_in_progress = true; | |
3406 drain_evac_failure_scan_stack(); | |
3407 _drain_in_progress = false; | |
3408 } | |
3409 } | |
3410 | |
3411 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
3412 if (m != markOopDesc::prototype()) { | |
3413 if (_objs_with_preserved_marks == NULL) { | |
3414 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
3415 _objs_with_preserved_marks = | |
3416 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
3417 _preserved_marks_of_objs = | |
3418 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
3419 } | |
3420 _objs_with_preserved_marks->push(obj); | |
3421 _preserved_marks_of_objs->push(m); | |
3422 } | |
3423 } | |
3424 | |
3425 // *** Parallel G1 Evacuation | |
3426 | |
3427 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
3428 size_t word_size) { | |
3429 HeapRegion* alloc_region = _gc_alloc_regions[purpose]; | |
3430 // let the caller handle alloc failure | |
3431 if (alloc_region == NULL) return NULL; | |
3432 | |
3433 HeapWord* block = alloc_region->par_allocate(word_size); | |
3434 if (block == NULL) { | |
3435 MutexLockerEx x(par_alloc_during_gc_lock(), | |
3436 Mutex::_no_safepoint_check_flag); | |
3437 block = allocate_during_gc_slow(purpose, alloc_region, true, word_size); | |
3438 } | |
3439 return block; | |
3440 } | |
3441 | |
545 | 3442 void G1CollectedHeap::retire_alloc_region(HeapRegion* alloc_region, |
3443 bool par) { | |
3444 // Another thread might have obtained alloc_region for the given | |
3445 // purpose, and might be attempting to allocate in it, and might | |
3446 // succeed. Therefore, we can't do the "finalization" stuff on the | |
3447 // region below until we're sure the last allocation has happened. | |
3448 // We ensure this by allocating the remaining space with a garbage | |
3449 // object. | |
3450 if (par) par_allocate_remaining_space(alloc_region); | |
3451 // Now we can do the post-GC stuff on the region. | |
3452 alloc_region->note_end_of_copying(); | |
3453 g1_policy()->record_after_bytes(alloc_region->used()); | |
3454 } | |
3455 | |
342 | 3456 HeapWord* |
3457 G1CollectedHeap::allocate_during_gc_slow(GCAllocPurpose purpose, | |
3458 HeapRegion* alloc_region, | |
3459 bool par, | |
3460 size_t word_size) { | |
3461 HeapWord* block = NULL; | |
3462 // In the parallel case, a previous thread to obtain the lock may have | |
3463 // already assigned a new gc_alloc_region. | |
3464 if (alloc_region != _gc_alloc_regions[purpose]) { | |
3465 assert(par, "But should only happen in parallel case."); | |
3466 alloc_region = _gc_alloc_regions[purpose]; | |
3467 if (alloc_region == NULL) return NULL; | |
3468 block = alloc_region->par_allocate(word_size); | |
3469 if (block != NULL) return block; | |
3470 // Otherwise, continue; this new region is empty, too. | |
3471 } | |
3472 assert(alloc_region != NULL, "We better have an allocation region"); | |
545 | 3473 retire_alloc_region(alloc_region, par); |
342 | 3474 |
3475 if (_gc_alloc_region_counts[purpose] >= g1_policy()->max_regions(purpose)) { | |
3476 // Cannot allocate more regions for the given purpose. | |
3477 GCAllocPurpose alt_purpose = g1_policy()->alternative_purpose(purpose); | |
3478 // Is there an alternative? | |
3479 if (purpose != alt_purpose) { | |
3480 HeapRegion* alt_region = _gc_alloc_regions[alt_purpose]; | |
3481 // Has not the alternative region been aliased? | |
545 | 3482 if (alloc_region != alt_region && alt_region != NULL) { |
342 | 3483 // Try to allocate in the alternative region. |
3484 if (par) { | |
3485 block = alt_region->par_allocate(word_size); | |
3486 } else { | |
3487 block = alt_region->allocate(word_size); | |
3488 } | |
3489 // Make an alias. | |
3490 _gc_alloc_regions[purpose] = _gc_alloc_regions[alt_purpose]; | |
545 | 3491 if (block != NULL) { |
3492 return block; | |
3493 } | |
3494 retire_alloc_region(alt_region, par); | |
342 | 3495 } |
3496 // Both the allocation region and the alternative one are full | |
3497 // and aliased, replace them with a new allocation region. | |
3498 purpose = alt_purpose; | |
3499 } else { | |
3500 set_gc_alloc_region(purpose, NULL); | |
3501 return NULL; | |
3502 } | |
3503 } | |
3504 | |
3505 // Now allocate a new region for allocation. | |
3506 alloc_region = newAllocRegionWithExpansion(purpose, word_size, false /*zero_filled*/); | |
3507 | |
3508 // let the caller handle alloc failure | |
3509 if (alloc_region != NULL) { | |
3510 | |
3511 assert(check_gc_alloc_regions(), "alloc regions messed up"); | |
3512 assert(alloc_region->saved_mark_at_top(), | |
3513 "Mark should have been saved already."); | |
3514 // We used to assert that the region was zero-filled here, but no | |
3515 // longer. | |
3516 | |
3517 // This must be done last: once it's installed, other regions may | |
3518 // allocate in it (without holding the lock.) | |
3519 set_gc_alloc_region(purpose, alloc_region); | |
3520 | |
3521 if (par) { | |
3522 block = alloc_region->par_allocate(word_size); | |
3523 } else { | |
3524 block = alloc_region->allocate(word_size); | |
3525 } | |
3526 // Caller handles alloc failure. | |
3527 } else { | |
3528 // This sets other apis using the same old alloc region to NULL, also. | |
3529 set_gc_alloc_region(purpose, NULL); | |
3530 } | |
3531 return block; // May be NULL. | |
3532 } | |
3533 | |
3534 void G1CollectedHeap::par_allocate_remaining_space(HeapRegion* r) { | |
3535 HeapWord* block = NULL; | |
3536 size_t free_words; | |
3537 do { | |
3538 free_words = r->free()/HeapWordSize; | |
3539 // If there's too little space, no one can allocate, so we're done. | |
3540 if (free_words < (size_t)oopDesc::header_size()) return; | |
3541 // Otherwise, try to claim it. | |
3542 block = r->par_allocate(free_words); | |
3543 } while (block == NULL); | |
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3544 fill_with_object(block, free_words); |
342 | 3545 } |
3546 | |
3547 #ifndef PRODUCT | |
3548 bool GCLabBitMapClosure::do_bit(size_t offset) { | |
3549 HeapWord* addr = _bitmap->offsetToHeapWord(offset); | |
3550 guarantee(_cm->isMarked(oop(addr)), "it should be!"); | |
3551 return true; | |
3552 } | |
3553 #endif // PRODUCT | |
3554 | |
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3555 G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num) |
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3556 : _g1h(g1h), |
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3557 _refs(g1h->task_queue(queue_num)), |
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3558 _dcq(&g1h->dirty_card_queue_set()), |
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3559 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
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3560 _g1_rem(g1h->g1_rem_set()), |
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3561 _hash_seed(17), _queue_num(queue_num), |
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3562 _term_attempts(0), |
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3563 _age_table(false), |
342 | 3564 #if G1_DETAILED_STATS |
845
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3565 _pushes(0), _pops(0), _steals(0), |
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3566 _steal_attempts(0), _overflow_pushes(0), |
342 | 3567 #endif |
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3568 _strong_roots_time(0), _term_time(0), |
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3569 _alloc_buffer_waste(0), _undo_waste(0) |
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3570 { |
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3571 // we allocate G1YoungSurvRateNumRegions plus one entries, since |
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3572 // we "sacrifice" entry 0 to keep track of surviving bytes for |
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3573 // non-young regions (where the age is -1) |
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3574 // We also add a few elements at the beginning and at the end in |
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3575 // an attempt to eliminate cache contention |
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3576 size_t real_length = 1 + _g1h->g1_policy()->young_cset_length(); |
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3577 size_t array_length = PADDING_ELEM_NUM + |
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3578 real_length + |
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3579 PADDING_ELEM_NUM; |
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3580 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length); |
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3581 if (_surviving_young_words_base == NULL) |
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3582 vm_exit_out_of_memory(array_length * sizeof(size_t), |
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3583 "Not enough space for young surv histo."); |
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3584 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; |
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3585 memset(_surviving_young_words, 0, real_length * sizeof(size_t)); |
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3586 |
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3587 _overflowed_refs = new OverflowQueue(10); |
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3588 |
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3589 _start = os::elapsedTime(); |
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3590 } |
342 | 3591 |
3592 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : | |
3593 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), | |
3594 _par_scan_state(par_scan_state) { } | |
3595 | |
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3596 template <class T> void G1ParCopyHelper::mark_forwardee(T* p) { |
342 | 3597 // This is called _after_ do_oop_work has been called, hence after |
3598 // the object has been relocated to its new location and *p points | |
3599 // to its new location. | |
3600 | |
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3601 T heap_oop = oopDesc::load_heap_oop(p); |
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3602 if (!oopDesc::is_null(heap_oop)) { |
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3603 oop obj = oopDesc::decode_heap_oop(heap_oop); |
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3604 assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj)), |
342 | 3605 "shouldn't still be in the CSet if evacuation didn't fail."); |
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3606 HeapWord* addr = (HeapWord*)obj; |
342 | 3607 if (_g1->is_in_g1_reserved(addr)) |
3608 _cm->grayRoot(oop(addr)); | |
3609 } | |
3610 } | |
3611 | |
3612 oop G1ParCopyHelper::copy_to_survivor_space(oop old) { | |
3613 size_t word_sz = old->size(); | |
3614 HeapRegion* from_region = _g1->heap_region_containing_raw(old); | |
3615 // +1 to make the -1 indexes valid... | |
3616 int young_index = from_region->young_index_in_cset()+1; | |
3617 assert( (from_region->is_young() && young_index > 0) || | |
3618 (!from_region->is_young() && young_index == 0), "invariant" ); | |
3619 G1CollectorPolicy* g1p = _g1->g1_policy(); | |
3620 markOop m = old->mark(); | |
545 | 3621 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
3622 : m->age(); | |
3623 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
342 | 3624 word_sz); |
3625 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
3626 oop obj = oop(obj_ptr); | |
3627 | |
3628 if (obj_ptr == NULL) { | |
3629 // This will either forward-to-self, or detect that someone else has | |
3630 // installed a forwarding pointer. | |
3631 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
3632 return _g1->handle_evacuation_failure_par(cl, old); | |
3633 } | |
3634 | |
526 | 3635 // We're going to allocate linearly, so might as well prefetch ahead. |
3636 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
3637 | |
342 | 3638 oop forward_ptr = old->forward_to_atomic(obj); |
3639 if (forward_ptr == NULL) { | |
3640 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
526 | 3641 if (g1p->track_object_age(alloc_purpose)) { |
3642 // We could simply do obj->incr_age(). However, this causes a | |
3643 // performance issue. obj->incr_age() will first check whether | |
3644 // the object has a displaced mark by checking its mark word; | |
3645 // getting the mark word from the new location of the object | |
3646 // stalls. So, given that we already have the mark word and we | |
3647 // are about to install it anyway, it's better to increase the | |
3648 // age on the mark word, when the object does not have a | |
3649 // displaced mark word. We're not expecting many objects to have | |
3650 // a displaced marked word, so that case is not optimized | |
3651 // further (it could be...) and we simply call obj->incr_age(). | |
3652 | |
3653 if (m->has_displaced_mark_helper()) { | |
3654 // in this case, we have to install the mark word first, | |
3655 // otherwise obj looks to be forwarded (the old mark word, | |
3656 // which contains the forward pointer, was copied) | |
3657 obj->set_mark(m); | |
3658 obj->incr_age(); | |
3659 } else { | |
3660 m = m->incr_age(); | |
545 | 3661 obj->set_mark(m); |
526 | 3662 } |
545 | 3663 _par_scan_state->age_table()->add(obj, word_sz); |
3664 } else { | |
3665 obj->set_mark(m); | |
526 | 3666 } |
3667 | |
342 | 3668 // preserve "next" mark bit |
3669 if (_g1->mark_in_progress() && !_g1->is_obj_ill(old)) { | |
3670 if (!use_local_bitmaps || | |
3671 !_par_scan_state->alloc_buffer(alloc_purpose)->mark(obj_ptr)) { | |
3672 // if we couldn't mark it on the local bitmap (this happens when | |
3673 // the object was not allocated in the GCLab), we have to bite | |
3674 // the bullet and do the standard parallel mark | |
3675 _cm->markAndGrayObjectIfNecessary(obj); | |
3676 } | |
3677 #if 1 | |
3678 if (_g1->isMarkedNext(old)) { | |
3679 _cm->nextMarkBitMap()->parClear((HeapWord*)old); | |
3680 } | |
3681 #endif | |
3682 } | |
3683 | |
3684 size_t* surv_young_words = _par_scan_state->surviving_young_words(); | |
3685 surv_young_words[young_index] += word_sz; | |
3686 | |
3687 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
3688 arrayOop(old)->set_length(0); | |
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3689 oop* old_p = set_partial_array_mask(old); |
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3690 _par_scan_state->push_on_queue(old_p); |
342 | 3691 } else { |
526 | 3692 // No point in using the slower heap_region_containing() method, |
3693 // given that we know obj is in the heap. | |
3694 _scanner->set_region(_g1->heap_region_containing_raw(obj)); | |
342 | 3695 obj->oop_iterate_backwards(_scanner); |
3696 } | |
3697 } else { | |
3698 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
3699 obj = forward_ptr; | |
3700 } | |
3701 return obj; | |
3702 } | |
3703 | |
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3704 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_forwardee, bool skip_cset_test> |
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3705 template <class T> |
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3706 void G1ParCopyClosure <do_gen_barrier, barrier, do_mark_forwardee, skip_cset_test> |
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3707 ::do_oop_work(T* p) { |
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3708 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 3709 assert(barrier != G1BarrierRS || obj != NULL, |
3710 "Precondition: G1BarrierRS implies obj is nonNull"); | |
3711 | |
526 | 3712 // The only time we skip the cset test is when we're scanning |
3713 // references popped from the queue. And we only push on the queue | |
3714 // references that we know point into the cset, so no point in | |
3715 // checking again. But we'll leave an assert here for peace of mind. | |
3716 assert(!skip_cset_test || _g1->obj_in_cs(obj), "invariant"); | |
3717 | |
3718 // here the null check is implicit in the cset_fast_test() test | |
3719 if (skip_cset_test || _g1->in_cset_fast_test(obj)) { | |
342 | 3720 #if G1_REM_SET_LOGGING |
526 | 3721 gclog_or_tty->print_cr("Loc "PTR_FORMAT" contains pointer "PTR_FORMAT" " |
3722 "into CS.", p, (void*) obj); | |
342 | 3723 #endif |
526 | 3724 if (obj->is_forwarded()) { |
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3725 oopDesc::encode_store_heap_oop(p, obj->forwardee()); |
526 | 3726 } else { |
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3727 oop copy_oop = copy_to_survivor_space(obj); |
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3728 oopDesc::encode_store_heap_oop(p, copy_oop); |
342 | 3729 } |
526 | 3730 // When scanning the RS, we only care about objs in CS. |
3731 if (barrier == G1BarrierRS) { | |
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3732 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
342 | 3733 } |
526 | 3734 } |
3735 | |
3736 // When scanning moved objs, must look at all oops. | |
3737 if (barrier == G1BarrierEvac && obj != NULL) { | |
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3738 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
526 | 3739 } |
3740 | |
3741 if (do_gen_barrier && obj != NULL) { | |
3742 par_do_barrier(p); | |
3743 } | |
3744 } | |
3745 | |
3746 template void G1ParCopyClosure<false, G1BarrierEvac, false, true>::do_oop_work(oop* p); | |
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3747 template void G1ParCopyClosure<false, G1BarrierEvac, false, true>::do_oop_work(narrowOop* p); |
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3748 |
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3749 template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) { |
526 | 3750 assert(has_partial_array_mask(p), "invariant"); |
3751 oop old = clear_partial_array_mask(p); | |
342 | 3752 assert(old->is_objArray(), "must be obj array"); |
3753 assert(old->is_forwarded(), "must be forwarded"); | |
3754 assert(Universe::heap()->is_in_reserved(old), "must be in heap."); | |
3755 | |
3756 objArrayOop obj = objArrayOop(old->forwardee()); | |
3757 assert((void*)old != (void*)old->forwardee(), "self forwarding here?"); | |
3758 // Process ParGCArrayScanChunk elements now | |
3759 // and push the remainder back onto queue | |
3760 int start = arrayOop(old)->length(); | |
3761 int end = obj->length(); | |
3762 int remainder = end - start; | |
3763 assert(start <= end, "just checking"); | |
3764 if (remainder > 2 * ParGCArrayScanChunk) { | |
3765 // Test above combines last partial chunk with a full chunk | |
3766 end = start + ParGCArrayScanChunk; | |
3767 arrayOop(old)->set_length(end); | |
3768 // Push remainder. | |
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3769 oop* old_p = set_partial_array_mask(old); |
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3770 assert(arrayOop(old)->length() < obj->length(), "Empty push?"); |
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3771 _par_scan_state->push_on_queue(old_p); |
342 | 3772 } else { |
3773 // Restore length so that the heap remains parsable in | |
3774 // case of evacuation failure. | |
3775 arrayOop(old)->set_length(end); | |
3776 } | |
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3777 _scanner.set_region(_g1->heap_region_containing_raw(obj)); |
342 | 3778 // process our set of indices (include header in first chunk) |
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3779 obj->oop_iterate_range(&_scanner, start, end); |
342 | 3780 } |
3781 | |
3782 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
3783 protected: | |
3784 G1CollectedHeap* _g1h; | |
3785 G1ParScanThreadState* _par_scan_state; | |
3786 RefToScanQueueSet* _queues; | |
3787 ParallelTaskTerminator* _terminator; | |
3788 | |
3789 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
3790 RefToScanQueueSet* queues() { return _queues; } | |
3791 ParallelTaskTerminator* terminator() { return _terminator; } | |
3792 | |
3793 public: | |
3794 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
3795 G1ParScanThreadState* par_scan_state, | |
3796 RefToScanQueueSet* queues, | |
3797 ParallelTaskTerminator* terminator) | |
3798 : _g1h(g1h), _par_scan_state(par_scan_state), | |
3799 _queues(queues), _terminator(terminator) {} | |
3800 | |
3801 void do_void() { | |
3802 G1ParScanThreadState* pss = par_scan_state(); | |
3803 while (true) { | |
3804 pss->trim_queue(); | |
3805 IF_G1_DETAILED_STATS(pss->note_steal_attempt()); | |
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3806 |
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3807 StarTask stolen_task; |
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3808 if (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) { |
342 | 3809 IF_G1_DETAILED_STATS(pss->note_steal()); |
526 | 3810 |
3811 // slightly paranoid tests; I'm trying to catch potential | |
3812 // problems before we go into push_on_queue to know where the | |
3813 // problem is coming from | |
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3814 assert((oop*)stolen_task != NULL, "Error"); |
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3815 if (stolen_task.is_narrow()) { |
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3816 assert(UseCompressedOops, "Error"); |
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3817 narrowOop* p = (narrowOop*) stolen_task; |
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3818 assert(has_partial_array_mask(p) || |
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3819 _g1h->obj_in_cs(oopDesc::load_decode_heap_oop(p)), "Error"); |
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3820 pss->push_on_queue(p); |
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3821 } else { |
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3822 oop* p = (oop*) stolen_task; |
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3823 assert(has_partial_array_mask(p) || _g1h->obj_in_cs(*p), "Error"); |
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3824 pss->push_on_queue(p); |
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3825 } |
342 | 3826 continue; |
3827 } | |
3828 pss->start_term_time(); | |
3829 if (terminator()->offer_termination()) break; | |
3830 pss->end_term_time(); | |
3831 } | |
3832 pss->end_term_time(); | |
3833 pss->retire_alloc_buffers(); | |
3834 } | |
3835 }; | |
3836 | |
3837 class G1ParTask : public AbstractGangTask { | |
3838 protected: | |
3839 G1CollectedHeap* _g1h; | |
3840 RefToScanQueueSet *_queues; | |
3841 ParallelTaskTerminator _terminator; | |
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3842 int _n_workers; |
342 | 3843 |
3844 Mutex _stats_lock; | |
3845 Mutex* stats_lock() { return &_stats_lock; } | |
3846 | |
3847 size_t getNCards() { | |
3848 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
3849 / G1BlockOffsetSharedArray::N_bytes; | |
3850 } | |
3851 | |
3852 public: | |
3853 G1ParTask(G1CollectedHeap* g1h, int workers, RefToScanQueueSet *task_queues) | |
3854 : AbstractGangTask("G1 collection"), | |
3855 _g1h(g1h), | |
3856 _queues(task_queues), | |
3857 _terminator(workers, _queues), | |
845
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3858 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true), |
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3859 _n_workers(workers) |
342 | 3860 {} |
3861 | |
3862 RefToScanQueueSet* queues() { return _queues; } | |
3863 | |
3864 RefToScanQueue *work_queue(int i) { | |
3865 return queues()->queue(i); | |
3866 } | |
3867 | |
3868 void work(int i) { | |
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3869 if (i >= _n_workers) return; // no work needed this round |
342 | 3870 ResourceMark rm; |
3871 HandleMark hm; | |
3872 | |
526 | 3873 G1ParScanThreadState pss(_g1h, i); |
3874 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss); | |
3875 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss); | |
3876 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss); | |
342 | 3877 |
3878 pss.set_evac_closure(&scan_evac_cl); | |
3879 pss.set_evac_failure_closure(&evac_failure_cl); | |
3880 pss.set_partial_scan_closure(&partial_scan_cl); | |
3881 | |
3882 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss); | |
3883 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss); | |
3884 G1ParScanHeapRSClosure only_scan_heap_rs_cl(_g1h, &pss); | |
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3885 |
342 | 3886 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss); |
3887 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss); | |
3888 G1ParScanAndMarkHeapRSClosure scan_mark_heap_rs_cl(_g1h, &pss); | |
3889 | |
3890 OopsInHeapRegionClosure *scan_root_cl; | |
3891 OopsInHeapRegionClosure *scan_perm_cl; | |
3892 OopsInHeapRegionClosure *scan_so_cl; | |
3893 | |
3894 if (_g1h->g1_policy()->should_initiate_conc_mark()) { | |
3895 scan_root_cl = &scan_mark_root_cl; | |
3896 scan_perm_cl = &scan_mark_perm_cl; | |
3897 scan_so_cl = &scan_mark_heap_rs_cl; | |
3898 } else { | |
3899 scan_root_cl = &only_scan_root_cl; | |
3900 scan_perm_cl = &only_scan_perm_cl; | |
3901 scan_so_cl = &only_scan_heap_rs_cl; | |
3902 } | |
3903 | |
3904 pss.start_strong_roots(); | |
3905 _g1h->g1_process_strong_roots(/* not collecting perm */ false, | |
3906 SharedHeap::SO_AllClasses, | |
3907 scan_root_cl, | |
3908 &only_scan_heap_rs_cl, | |
3909 scan_so_cl, | |
3910 scan_perm_cl, | |
3911 i); | |
3912 pss.end_strong_roots(); | |
3913 { | |
3914 double start = os::elapsedTime(); | |
3915 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); | |
3916 evac.do_void(); | |
3917 double elapsed_ms = (os::elapsedTime()-start)*1000.0; | |
3918 double term_ms = pss.term_time()*1000.0; | |
3919 _g1h->g1_policy()->record_obj_copy_time(i, elapsed_ms-term_ms); | |
3920 _g1h->g1_policy()->record_termination_time(i, term_ms); | |
3921 } | |
751 | 3922 if (G1UseSurvivorSpaces) { |
545 | 3923 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); |
3924 } | |
342 | 3925 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
3926 | |
3927 // Clean up any par-expanded rem sets. | |
3928 HeapRegionRemSet::par_cleanup(); | |
3929 | |
3930 MutexLocker x(stats_lock()); | |
3931 if (ParallelGCVerbose) { | |
3932 gclog_or_tty->print("Thread %d complete:\n", i); | |
3933 #if G1_DETAILED_STATS | |
3934 gclog_or_tty->print(" Pushes: %7d Pops: %7d Overflows: %7d Steals %7d (in %d attempts)\n", | |
3935 pss.pushes(), | |
3936 pss.pops(), | |
3937 pss.overflow_pushes(), | |
3938 pss.steals(), | |
3939 pss.steal_attempts()); | |
3940 #endif | |
3941 double elapsed = pss.elapsed(); | |
3942 double strong_roots = pss.strong_roots_time(); | |
3943 double term = pss.term_time(); | |
3944 gclog_or_tty->print(" Elapsed: %7.2f ms.\n" | |
3945 " Strong roots: %7.2f ms (%6.2f%%)\n" | |
3946 " Termination: %7.2f ms (%6.2f%%) (in %d entries)\n", | |
3947 elapsed * 1000.0, | |
3948 strong_roots * 1000.0, (strong_roots*100.0/elapsed), | |
3949 term * 1000.0, (term*100.0/elapsed), | |
3950 pss.term_attempts()); | |
3951 size_t total_waste = pss.alloc_buffer_waste() + pss.undo_waste(); | |
3952 gclog_or_tty->print(" Waste: %8dK\n" | |
3953 " Alloc Buffer: %8dK\n" | |
3954 " Undo: %8dK\n", | |
3955 (total_waste * HeapWordSize) / K, | |
3956 (pss.alloc_buffer_waste() * HeapWordSize) / K, | |
3957 (pss.undo_waste() * HeapWordSize) / K); | |
3958 } | |
3959 | |
3960 assert(pss.refs_to_scan() == 0, "Task queue should be empty"); | |
3961 assert(pss.overflowed_refs_to_scan() == 0, "Overflow queue should be empty"); | |
3962 } | |
3963 }; | |
3964 | |
3965 // *** Common G1 Evacuation Stuff | |
3966 | |
3967 void | |
3968 G1CollectedHeap:: | |
3969 g1_process_strong_roots(bool collecting_perm_gen, | |
3970 SharedHeap::ScanningOption so, | |
3971 OopClosure* scan_non_heap_roots, | |
3972 OopsInHeapRegionClosure* scan_rs, | |
3973 OopsInHeapRegionClosure* scan_so, | |
3974 OopsInGenClosure* scan_perm, | |
3975 int worker_i) { | |
3976 // First scan the strong roots, including the perm gen. | |
3977 double ext_roots_start = os::elapsedTime(); | |
3978 double closure_app_time_sec = 0.0; | |
3979 | |
3980 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
3981 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
3982 buf_scan_perm.set_generation(perm_gen()); | |
3983 | |
3984 process_strong_roots(collecting_perm_gen, so, | |
3985 &buf_scan_non_heap_roots, | |
3986 &buf_scan_perm); | |
3987 // Finish up any enqueued closure apps. | |
3988 buf_scan_non_heap_roots.done(); | |
3989 buf_scan_perm.done(); | |
3990 double ext_roots_end = os::elapsedTime(); | |
3991 g1_policy()->reset_obj_copy_time(worker_i); | |
3992 double obj_copy_time_sec = | |
3993 buf_scan_non_heap_roots.closure_app_seconds() + | |
3994 buf_scan_perm.closure_app_seconds(); | |
3995 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); | |
3996 double ext_root_time_ms = | |
3997 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
3998 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); | |
3999 | |
4000 // Scan strong roots in mark stack. | |
4001 if (!_process_strong_tasks->is_task_claimed(G1H_PS_mark_stack_oops_do)) { | |
4002 concurrent_mark()->oops_do(scan_non_heap_roots); | |
4003 } | |
4004 double mark_stack_scan_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; | |
4005 g1_policy()->record_mark_stack_scan_time(worker_i, mark_stack_scan_ms); | |
4006 | |
4007 // XXX What should this be doing in the parallel case? | |
4008 g1_policy()->record_collection_pause_end_CH_strong_roots(); | |
4009 if (scan_so != NULL) { | |
4010 scan_scan_only_set(scan_so, worker_i); | |
4011 } | |
4012 // Now scan the complement of the collection set. | |
4013 if (scan_rs != NULL) { | |
4014 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
4015 } | |
4016 // Finish with the ref_processor roots. | |
4017 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { | |
4018 ref_processor()->oops_do(scan_non_heap_roots); | |
4019 } | |
4020 g1_policy()->record_collection_pause_end_G1_strong_roots(); | |
4021 _process_strong_tasks->all_tasks_completed(); | |
4022 } | |
4023 | |
4024 void | |
4025 G1CollectedHeap::scan_scan_only_region(HeapRegion* r, | |
4026 OopsInHeapRegionClosure* oc, | |
4027 int worker_i) { | |
4028 HeapWord* startAddr = r->bottom(); | |
4029 HeapWord* endAddr = r->used_region().end(); | |
4030 | |
4031 oc->set_region(r); | |
4032 | |
4033 HeapWord* p = r->bottom(); | |
4034 HeapWord* t = r->top(); | |
4035 guarantee( p == r->next_top_at_mark_start(), "invariant" ); | |
4036 while (p < t) { | |
4037 oop obj = oop(p); | |
4038 p += obj->oop_iterate(oc); | |
4039 } | |
4040 } | |
4041 | |
4042 void | |
4043 G1CollectedHeap::scan_scan_only_set(OopsInHeapRegionClosure* oc, | |
4044 int worker_i) { | |
4045 double start = os::elapsedTime(); | |
4046 | |
4047 BufferingOopsInHeapRegionClosure boc(oc); | |
4048 | |
4049 FilterInHeapRegionAndIntoCSClosure scan_only(this, &boc); | |
4050 FilterAndMarkInHeapRegionAndIntoCSClosure scan_and_mark(this, &boc, concurrent_mark()); | |
4051 | |
4052 OopsInHeapRegionClosure *foc; | |
4053 if (g1_policy()->should_initiate_conc_mark()) | |
4054 foc = &scan_and_mark; | |
4055 else | |
4056 foc = &scan_only; | |
4057 | |
4058 HeapRegion* hr; | |
4059 int n = 0; | |
4060 while ((hr = _young_list->par_get_next_scan_only_region()) != NULL) { | |
4061 scan_scan_only_region(hr, foc, worker_i); | |
4062 ++n; | |
4063 } | |
4064 boc.done(); | |
4065 | |
4066 double closure_app_s = boc.closure_app_seconds(); | |
4067 g1_policy()->record_obj_copy_time(worker_i, closure_app_s * 1000.0); | |
4068 double ms = (os::elapsedTime() - start - closure_app_s)*1000.0; | |
4069 g1_policy()->record_scan_only_time(worker_i, ms, n); | |
4070 } | |
4071 | |
4072 void | |
4073 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
4074 OopClosure* non_root_closure) { | |
4075 SharedHeap::process_weak_roots(root_closure, non_root_closure); | |
4076 } | |
4077 | |
4078 | |
4079 class SaveMarksClosure: public HeapRegionClosure { | |
4080 public: | |
4081 bool doHeapRegion(HeapRegion* r) { | |
4082 r->save_marks(); | |
4083 return false; | |
4084 } | |
4085 }; | |
4086 | |
4087 void G1CollectedHeap::save_marks() { | |
4088 if (ParallelGCThreads == 0) { | |
4089 SaveMarksClosure sm; | |
4090 heap_region_iterate(&sm); | |
4091 } | |
4092 // We do this even in the parallel case | |
4093 perm_gen()->save_marks(); | |
4094 } | |
4095 | |
4096 void G1CollectedHeap::evacuate_collection_set() { | |
4097 set_evacuation_failed(false); | |
4098 | |
4099 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
4100 concurrent_g1_refine()->set_use_cache(false); | |
889 | 4101 concurrent_g1_refine()->clear_hot_cache_claimed_index(); |
4102 | |
342 | 4103 int n_workers = (ParallelGCThreads > 0 ? workers()->total_workers() : 1); |
4104 set_par_threads(n_workers); | |
4105 G1ParTask g1_par_task(this, n_workers, _task_queues); | |
4106 | |
4107 init_for_evac_failure(NULL); | |
4108 | |
4109 change_strong_roots_parity(); // In preparation for parallel strong roots. | |
4110 rem_set()->prepare_for_younger_refs_iterate(true); | |
616
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4111 |
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4112 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
342 | 4113 double start_par = os::elapsedTime(); |
4114 if (ParallelGCThreads > 0) { | |
4115 // The individual threads will set their evac-failure closures. | |
4116 workers()->run_task(&g1_par_task); | |
4117 } else { | |
4118 g1_par_task.work(0); | |
4119 } | |
4120 | |
4121 double par_time = (os::elapsedTime() - start_par) * 1000.0; | |
4122 g1_policy()->record_par_time(par_time); | |
4123 set_par_threads(0); | |
4124 // Is this the right thing to do here? We don't save marks | |
4125 // on individual heap regions when we allocate from | |
4126 // them in parallel, so this seems like the correct place for this. | |
545 | 4127 retire_all_alloc_regions(); |
342 | 4128 { |
4129 G1IsAliveClosure is_alive(this); | |
4130 G1KeepAliveClosure keep_alive(this); | |
4131 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
4132 } | |
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4133 release_gc_alloc_regions(false /* totally */); |
342 | 4134 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); |
616
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4135 |
889 | 4136 concurrent_g1_refine()->clear_hot_cache(); |
342 | 4137 concurrent_g1_refine()->set_use_cache(true); |
4138 | |
4139 finalize_for_evac_failure(); | |
4140 | |
4141 // Must do this before removing self-forwarding pointers, which clears | |
4142 // the per-region evac-failure flags. | |
4143 concurrent_mark()->complete_marking_in_collection_set(); | |
4144 | |
4145 if (evacuation_failed()) { | |
4146 remove_self_forwarding_pointers(); | |
4147 if (PrintGCDetails) { | |
4148 gclog_or_tty->print(" (evacuation failed)"); | |
4149 } else if (PrintGC) { | |
4150 gclog_or_tty->print("--"); | |
4151 } | |
4152 } | |
4153 | |
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4154 if (G1DeferredRSUpdate) { |
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4155 RedirtyLoggedCardTableEntryFastClosure redirty; |
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4156 dirty_card_queue_set().set_closure(&redirty); |
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4157 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
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4158 JavaThread::dirty_card_queue_set().merge_bufferlists(&dirty_card_queue_set()); |
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4159 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
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4160 } |
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4161 |
342 | 4162 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
4163 } | |
4164 | |
4165 void G1CollectedHeap::free_region(HeapRegion* hr) { | |
4166 size_t pre_used = 0; | |
4167 size_t cleared_h_regions = 0; | |
4168 size_t freed_regions = 0; | |
4169 UncleanRegionList local_list; | |
4170 | |
4171 HeapWord* start = hr->bottom(); | |
4172 HeapWord* end = hr->prev_top_at_mark_start(); | |
4173 size_t used_bytes = hr->used(); | |
4174 size_t live_bytes = hr->max_live_bytes(); | |
4175 if (used_bytes > 0) { | |
4176 guarantee( live_bytes <= used_bytes, "invariant" ); | |
4177 } else { | |
4178 guarantee( live_bytes == 0, "invariant" ); | |
4179 } | |
4180 | |
4181 size_t garbage_bytes = used_bytes - live_bytes; | |
4182 if (garbage_bytes > 0) | |
4183 g1_policy()->decrease_known_garbage_bytes(garbage_bytes); | |
4184 | |
4185 free_region_work(hr, pre_used, cleared_h_regions, freed_regions, | |
4186 &local_list); | |
4187 finish_free_region_work(pre_used, cleared_h_regions, freed_regions, | |
4188 &local_list); | |
4189 } | |
4190 | |
4191 void | |
4192 G1CollectedHeap::free_region_work(HeapRegion* hr, | |
4193 size_t& pre_used, | |
4194 size_t& cleared_h_regions, | |
4195 size_t& freed_regions, | |
4196 UncleanRegionList* list, | |
4197 bool par) { | |
4198 pre_used += hr->used(); | |
4199 if (hr->isHumongous()) { | |
4200 assert(hr->startsHumongous(), | |
4201 "Only the start of a humongous region should be freed."); | |
4202 int ind = _hrs->find(hr); | |
4203 assert(ind != -1, "Should have an index."); | |
4204 // Clear the start region. | |
4205 hr->hr_clear(par, true /*clear_space*/); | |
4206 list->insert_before_head(hr); | |
4207 cleared_h_regions++; | |
4208 freed_regions++; | |
4209 // Clear any continued regions. | |
4210 ind++; | |
4211 while ((size_t)ind < n_regions()) { | |
4212 HeapRegion* hrc = _hrs->at(ind); | |
4213 if (!hrc->continuesHumongous()) break; | |
4214 // Otherwise, does continue the H region. | |
4215 assert(hrc->humongous_start_region() == hr, "Huh?"); | |
4216 hrc->hr_clear(par, true /*clear_space*/); | |
4217 cleared_h_regions++; | |
4218 freed_regions++; | |
4219 list->insert_before_head(hrc); | |
4220 ind++; | |
4221 } | |
4222 } else { | |
4223 hr->hr_clear(par, true /*clear_space*/); | |
4224 list->insert_before_head(hr); | |
4225 freed_regions++; | |
4226 // If we're using clear2, this should not be enabled. | |
4227 // assert(!hr->in_cohort(), "Can't be both free and in a cohort."); | |
4228 } | |
4229 } | |
4230 | |
4231 void G1CollectedHeap::finish_free_region_work(size_t pre_used, | |
4232 size_t cleared_h_regions, | |
4233 size_t freed_regions, | |
4234 UncleanRegionList* list) { | |
4235 if (list != NULL && list->sz() > 0) { | |
4236 prepend_region_list_on_unclean_list(list); | |
4237 } | |
4238 // Acquire a lock, if we're parallel, to update possibly-shared | |
4239 // variables. | |
4240 Mutex* lock = (n_par_threads() > 0) ? ParGCRareEvent_lock : NULL; | |
4241 { | |
4242 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); | |
4243 _summary_bytes_used -= pre_used; | |
4244 _num_humongous_regions -= (int) cleared_h_regions; | |
4245 _free_regions += freed_regions; | |
4246 } | |
4247 } | |
4248 | |
4249 | |
4250 void G1CollectedHeap::dirtyCardsForYoungRegions(CardTableModRefBS* ct_bs, HeapRegion* list) { | |
4251 while (list != NULL) { | |
4252 guarantee( list->is_young(), "invariant" ); | |
4253 | |
4254 HeapWord* bottom = list->bottom(); | |
4255 HeapWord* end = list->end(); | |
4256 MemRegion mr(bottom, end); | |
4257 ct_bs->dirty(mr); | |
4258 | |
4259 list = list->get_next_young_region(); | |
4260 } | |
4261 } | |
4262 | |
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4263 |
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4264 class G1ParCleanupCTTask : public AbstractGangTask { |
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4265 CardTableModRefBS* _ct_bs; |
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4266 G1CollectedHeap* _g1h; |
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4267 HeapRegion* volatile _so_head; |
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4268 HeapRegion* volatile _su_head; |
796
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4269 public: |
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4270 G1ParCleanupCTTask(CardTableModRefBS* ct_bs, |
940
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4271 G1CollectedHeap* g1h, |
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4272 HeapRegion* scan_only_list, |
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4273 HeapRegion* survivor_list) : |
796
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4274 AbstractGangTask("G1 Par Cleanup CT Task"), |
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4275 _ct_bs(ct_bs), |
940
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4276 _g1h(g1h), |
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4277 _so_head(scan_only_list), |
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4278 _su_head(survivor_list) |
796
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4279 { } |
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4280 |
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4281 void work(int i) { |
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4282 HeapRegion* r; |
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4283 while (r = _g1h->pop_dirty_cards_region()) { |
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4284 clear_cards(r); |
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4285 } |
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4286 // Redirty the cards of the scan-only and survivor regions. |
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4287 dirty_list(&this->_so_head); |
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4288 dirty_list(&this->_su_head); |
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4289 } |
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4290 |
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4291 void clear_cards(HeapRegion* r) { |
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4292 // Cards for Survivor and Scan-Only regions will be dirtied later. |
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4293 if (!r->is_scan_only() && !r->is_survivor()) { |
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4294 _ct_bs->clear(MemRegion(r->bottom(), r->end())); |
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4295 } |
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4296 } |
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4297 |
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4298 void dirty_list(HeapRegion* volatile * head_ptr) { |
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4299 HeapRegion* head; |
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4300 do { |
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4301 // Pop region off the list. |
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4302 head = *head_ptr; |
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4303 if (head != NULL) { |
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4304 HeapRegion* r = (HeapRegion*) |
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4305 Atomic::cmpxchg_ptr(head->get_next_young_region(), head_ptr, head); |
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4306 if (r == head) { |
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4307 assert(!r->isHumongous(), "Humongous regions shouldn't be on survivor list"); |
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4308 _ct_bs->dirty(MemRegion(r->bottom(), r->end())); |
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4309 } |
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4310 } |
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4311 } while (*head_ptr != NULL); |
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4312 } |
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4313 }; |
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4314 |
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4315 |
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4316 #ifndef PRODUCT |
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4317 class G1VerifyCardTableCleanup: public HeapRegionClosure { |
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4318 CardTableModRefBS* _ct_bs; |
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4319 public: |
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4320 G1VerifyCardTableCleanup(CardTableModRefBS* ct_bs) |
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4321 : _ct_bs(ct_bs) |
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4322 { } |
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4323 virtual bool doHeapRegion(HeapRegion* r) |
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4324 { |
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4325 MemRegion mr(r->bottom(), r->end()); |
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4326 if (r->is_scan_only() || r->is_survivor()) { |
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4327 _ct_bs->verify_dirty_region(mr); |
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4328 } else { |
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4329 _ct_bs->verify_clean_region(mr); |
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4330 } |
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4331 return false; |
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4332 } |
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4333 }; |
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4334 #endif |
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4335 |
342 | 4336 void G1CollectedHeap::cleanUpCardTable() { |
4337 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
4338 double start = os::elapsedTime(); | |
4339 | |
796
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4340 // Iterate over the dirty cards region list. |
940
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4341 G1ParCleanupCTTask cleanup_task(ct_bs, this, |
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4342 _young_list->first_scan_only_region(), |
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4343 _young_list->first_survivor_region()); |
796
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4344 if (ParallelGCThreads > 0) { |
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4345 set_par_threads(workers()->total_workers()); |
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4346 workers()->run_task(&cleanup_task); |
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4347 set_par_threads(0); |
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4348 } else { |
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4349 while (_dirty_cards_region_list) { |
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4350 HeapRegion* r = _dirty_cards_region_list; |
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4351 cleanup_task.clear_cards(r); |
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4352 _dirty_cards_region_list = r->get_next_dirty_cards_region(); |
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4353 if (_dirty_cards_region_list == r) { |
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4354 // The last region. |
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4355 _dirty_cards_region_list = NULL; |
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4356 } |
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4357 r->set_next_dirty_cards_region(NULL); |
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4358 } |
940
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4359 // now, redirty the cards of the scan-only and survivor regions |
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4360 // (it seemed faster to do it this way, instead of iterating over |
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4361 // all regions and then clearing / dirtying as appropriate) |
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4362 dirtyCardsForYoungRegions(ct_bs, _young_list->first_scan_only_region()); |
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4363 dirtyCardsForYoungRegions(ct_bs, _young_list->first_survivor_region()); |
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4364 } |
342 | 4365 double elapsed = os::elapsedTime() - start; |
4366 g1_policy()->record_clear_ct_time( elapsed * 1000.0); | |
940
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4367 #ifndef PRODUCT |
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4368 if (G1VerifyCTCleanup || VerifyAfterGC) { |
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4369 G1VerifyCardTableCleanup cleanup_verifier(ct_bs); |
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4370 heap_region_iterate(&cleanup_verifier); |
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4371 } |
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4372 #endif |
342 | 4373 } |
4374 | |
4375 void G1CollectedHeap::do_collection_pause_if_appropriate(size_t word_size) { | |
4376 if (g1_policy()->should_do_collection_pause(word_size)) { | |
4377 do_collection_pause(); | |
4378 } | |
4379 } | |
4380 | |
4381 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
4382 double young_time_ms = 0.0; | |
4383 double non_young_time_ms = 0.0; | |
4384 | |
4385 G1CollectorPolicy* policy = g1_policy(); | |
4386 | |
4387 double start_sec = os::elapsedTime(); | |
4388 bool non_young = true; | |
4389 | |
4390 HeapRegion* cur = cs_head; | |
4391 int age_bound = -1; | |
4392 size_t rs_lengths = 0; | |
4393 | |
4394 while (cur != NULL) { | |
4395 if (non_young) { | |
4396 if (cur->is_young()) { | |
4397 double end_sec = os::elapsedTime(); | |
4398 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
4399 non_young_time_ms += elapsed_ms; | |
4400 | |
4401 start_sec = os::elapsedTime(); | |
4402 non_young = false; | |
4403 } | |
4404 } else { | |
4405 if (!cur->is_on_free_list()) { | |
4406 double end_sec = os::elapsedTime(); | |
4407 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
4408 young_time_ms += elapsed_ms; | |
4409 | |
4410 start_sec = os::elapsedTime(); | |
4411 non_young = true; | |
4412 } | |
4413 } | |
4414 | |
4415 rs_lengths += cur->rem_set()->occupied(); | |
4416 | |
4417 HeapRegion* next = cur->next_in_collection_set(); | |
4418 assert(cur->in_collection_set(), "bad CS"); | |
4419 cur->set_next_in_collection_set(NULL); | |
4420 cur->set_in_collection_set(false); | |
4421 | |
4422 if (cur->is_young()) { | |
4423 int index = cur->young_index_in_cset(); | |
4424 guarantee( index != -1, "invariant" ); | |
4425 guarantee( (size_t)index < policy->young_cset_length(), "invariant" ); | |
4426 size_t words_survived = _surviving_young_words[index]; | |
4427 cur->record_surv_words_in_group(words_survived); | |
4428 } else { | |
4429 int index = cur->young_index_in_cset(); | |
4430 guarantee( index == -1, "invariant" ); | |
4431 } | |
4432 | |
4433 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
4434 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
4435 "invariant" ); | |
4436 | |
4437 if (!cur->evacuation_failed()) { | |
4438 // And the region is empty. | |
4439 assert(!cur->is_empty(), | |
4440 "Should not have empty regions in a CS."); | |
4441 free_region(cur); | |
4442 } else { | |
4443 guarantee( !cur->is_scan_only(), "should not be scan only" ); | |
4444 cur->uninstall_surv_rate_group(); | |
4445 if (cur->is_young()) | |
4446 cur->set_young_index_in_cset(-1); | |
4447 cur->set_not_young(); | |
4448 cur->set_evacuation_failed(false); | |
4449 } | |
4450 cur = next; | |
4451 } | |
4452 | |
4453 policy->record_max_rs_lengths(rs_lengths); | |
4454 policy->cset_regions_freed(); | |
4455 | |
4456 double end_sec = os::elapsedTime(); | |
4457 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
4458 if (non_young) | |
4459 non_young_time_ms += elapsed_ms; | |
4460 else | |
4461 young_time_ms += elapsed_ms; | |
4462 | |
4463 policy->record_young_free_cset_time_ms(young_time_ms); | |
4464 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
4465 } | |
4466 | |
4467 HeapRegion* | |
4468 G1CollectedHeap::alloc_region_from_unclean_list_locked(bool zero_filled) { | |
4469 assert(ZF_mon->owned_by_self(), "Precondition"); | |
4470 HeapRegion* res = pop_unclean_region_list_locked(); | |
4471 if (res != NULL) { | |
4472 assert(!res->continuesHumongous() && | |
4473 res->zero_fill_state() != HeapRegion::Allocated, | |
4474 "Only free regions on unclean list."); | |
4475 if (zero_filled) { | |
4476 res->ensure_zero_filled_locked(); | |
4477 res->set_zero_fill_allocated(); | |
4478 } | |
4479 } | |
4480 return res; | |
4481 } | |
4482 | |
4483 HeapRegion* G1CollectedHeap::alloc_region_from_unclean_list(bool zero_filled) { | |
4484 MutexLockerEx zx(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4485 return alloc_region_from_unclean_list_locked(zero_filled); | |
4486 } | |
4487 | |
4488 void G1CollectedHeap::put_region_on_unclean_list(HeapRegion* r) { | |
4489 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4490 put_region_on_unclean_list_locked(r); | |
4491 if (should_zf()) ZF_mon->notify_all(); // Wake up ZF thread. | |
4492 } | |
4493 | |
4494 void G1CollectedHeap::set_unclean_regions_coming(bool b) { | |
4495 MutexLockerEx x(Cleanup_mon); | |
4496 set_unclean_regions_coming_locked(b); | |
4497 } | |
4498 | |
4499 void G1CollectedHeap::set_unclean_regions_coming_locked(bool b) { | |
4500 assert(Cleanup_mon->owned_by_self(), "Precondition"); | |
4501 _unclean_regions_coming = b; | |
4502 // Wake up mutator threads that might be waiting for completeCleanup to | |
4503 // finish. | |
4504 if (!b) Cleanup_mon->notify_all(); | |
4505 } | |
4506 | |
4507 void G1CollectedHeap::wait_for_cleanup_complete() { | |
4508 MutexLockerEx x(Cleanup_mon); | |
4509 wait_for_cleanup_complete_locked(); | |
4510 } | |
4511 | |
4512 void G1CollectedHeap::wait_for_cleanup_complete_locked() { | |
4513 assert(Cleanup_mon->owned_by_self(), "precondition"); | |
4514 while (_unclean_regions_coming) { | |
4515 Cleanup_mon->wait(); | |
4516 } | |
4517 } | |
4518 | |
4519 void | |
4520 G1CollectedHeap::put_region_on_unclean_list_locked(HeapRegion* r) { | |
4521 assert(ZF_mon->owned_by_self(), "precondition."); | |
4522 _unclean_region_list.insert_before_head(r); | |
4523 } | |
4524 | |
4525 void | |
4526 G1CollectedHeap::prepend_region_list_on_unclean_list(UncleanRegionList* list) { | |
4527 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4528 prepend_region_list_on_unclean_list_locked(list); | |
4529 if (should_zf()) ZF_mon->notify_all(); // Wake up ZF thread. | |
4530 } | |
4531 | |
4532 void | |
4533 G1CollectedHeap:: | |
4534 prepend_region_list_on_unclean_list_locked(UncleanRegionList* list) { | |
4535 assert(ZF_mon->owned_by_self(), "precondition."); | |
4536 _unclean_region_list.prepend_list(list); | |
4537 } | |
4538 | |
4539 HeapRegion* G1CollectedHeap::pop_unclean_region_list_locked() { | |
4540 assert(ZF_mon->owned_by_self(), "precondition."); | |
4541 HeapRegion* res = _unclean_region_list.pop(); | |
4542 if (res != NULL) { | |
4543 // Inform ZF thread that there's a new unclean head. | |
4544 if (_unclean_region_list.hd() != NULL && should_zf()) | |
4545 ZF_mon->notify_all(); | |
4546 } | |
4547 return res; | |
4548 } | |
4549 | |
4550 HeapRegion* G1CollectedHeap::peek_unclean_region_list_locked() { | |
4551 assert(ZF_mon->owned_by_self(), "precondition."); | |
4552 return _unclean_region_list.hd(); | |
4553 } | |
4554 | |
4555 | |
4556 bool G1CollectedHeap::move_cleaned_region_to_free_list_locked() { | |
4557 assert(ZF_mon->owned_by_self(), "Precondition"); | |
4558 HeapRegion* r = peek_unclean_region_list_locked(); | |
4559 if (r != NULL && r->zero_fill_state() == HeapRegion::ZeroFilled) { | |
4560 // Result of below must be equal to "r", since we hold the lock. | |
4561 (void)pop_unclean_region_list_locked(); | |
4562 put_free_region_on_list_locked(r); | |
4563 return true; | |
4564 } else { | |
4565 return false; | |
4566 } | |
4567 } | |
4568 | |
4569 bool G1CollectedHeap::move_cleaned_region_to_free_list() { | |
4570 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4571 return move_cleaned_region_to_free_list_locked(); | |
4572 } | |
4573 | |
4574 | |
4575 void G1CollectedHeap::put_free_region_on_list_locked(HeapRegion* r) { | |
4576 assert(ZF_mon->owned_by_self(), "precondition."); | |
4577 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
4578 assert(r->zero_fill_state() == HeapRegion::ZeroFilled, | |
4579 "Regions on free list must be zero filled"); | |
4580 assert(!r->isHumongous(), "Must not be humongous."); | |
4581 assert(r->is_empty(), "Better be empty"); | |
4582 assert(!r->is_on_free_list(), | |
4583 "Better not already be on free list"); | |
4584 assert(!r->is_on_unclean_list(), | |
4585 "Better not already be on unclean list"); | |
4586 r->set_on_free_list(true); | |
4587 r->set_next_on_free_list(_free_region_list); | |
4588 _free_region_list = r; | |
4589 _free_region_list_size++; | |
4590 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
4591 } | |
4592 | |
4593 void G1CollectedHeap::put_free_region_on_list(HeapRegion* r) { | |
4594 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4595 put_free_region_on_list_locked(r); | |
4596 } | |
4597 | |
4598 HeapRegion* G1CollectedHeap::pop_free_region_list_locked() { | |
4599 assert(ZF_mon->owned_by_self(), "precondition."); | |
4600 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
4601 HeapRegion* res = _free_region_list; | |
4602 if (res != NULL) { | |
4603 _free_region_list = res->next_from_free_list(); | |
4604 _free_region_list_size--; | |
4605 res->set_on_free_list(false); | |
4606 res->set_next_on_free_list(NULL); | |
4607 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
4608 } | |
4609 return res; | |
4610 } | |
4611 | |
4612 | |
4613 HeapRegion* G1CollectedHeap::alloc_free_region_from_lists(bool zero_filled) { | |
4614 // By self, or on behalf of self. | |
4615 assert(Heap_lock->is_locked(), "Precondition"); | |
4616 HeapRegion* res = NULL; | |
4617 bool first = true; | |
4618 while (res == NULL) { | |
4619 if (zero_filled || !first) { | |
4620 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4621 res = pop_free_region_list_locked(); | |
4622 if (res != NULL) { | |
4623 assert(!res->zero_fill_is_allocated(), | |
4624 "No allocated regions on free list."); | |
4625 res->set_zero_fill_allocated(); | |
4626 } else if (!first) { | |
4627 break; // We tried both, time to return NULL. | |
4628 } | |
4629 } | |
4630 | |
4631 if (res == NULL) { | |
4632 res = alloc_region_from_unclean_list(zero_filled); | |
4633 } | |
4634 assert(res == NULL || | |
4635 !zero_filled || | |
4636 res->zero_fill_is_allocated(), | |
4637 "We must have allocated the region we're returning"); | |
4638 first = false; | |
4639 } | |
4640 return res; | |
4641 } | |
4642 | |
4643 void G1CollectedHeap::remove_allocated_regions_from_lists() { | |
4644 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4645 { | |
4646 HeapRegion* prev = NULL; | |
4647 HeapRegion* cur = _unclean_region_list.hd(); | |
4648 while (cur != NULL) { | |
4649 HeapRegion* next = cur->next_from_unclean_list(); | |
4650 if (cur->zero_fill_is_allocated()) { | |
4651 // Remove from the list. | |
4652 if (prev == NULL) { | |
4653 (void)_unclean_region_list.pop(); | |
4654 } else { | |
4655 _unclean_region_list.delete_after(prev); | |
4656 } | |
4657 cur->set_on_unclean_list(false); | |
4658 cur->set_next_on_unclean_list(NULL); | |
4659 } else { | |
4660 prev = cur; | |
4661 } | |
4662 cur = next; | |
4663 } | |
4664 assert(_unclean_region_list.sz() == unclean_region_list_length(), | |
4665 "Inv"); | |
4666 } | |
4667 | |
4668 { | |
4669 HeapRegion* prev = NULL; | |
4670 HeapRegion* cur = _free_region_list; | |
4671 while (cur != NULL) { | |
4672 HeapRegion* next = cur->next_from_free_list(); | |
4673 if (cur->zero_fill_is_allocated()) { | |
4674 // Remove from the list. | |
4675 if (prev == NULL) { | |
4676 _free_region_list = cur->next_from_free_list(); | |
4677 } else { | |
4678 prev->set_next_on_free_list(cur->next_from_free_list()); | |
4679 } | |
4680 cur->set_on_free_list(false); | |
4681 cur->set_next_on_free_list(NULL); | |
4682 _free_region_list_size--; | |
4683 } else { | |
4684 prev = cur; | |
4685 } | |
4686 cur = next; | |
4687 } | |
4688 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
4689 } | |
4690 } | |
4691 | |
4692 bool G1CollectedHeap::verify_region_lists() { | |
4693 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4694 return verify_region_lists_locked(); | |
4695 } | |
4696 | |
4697 bool G1CollectedHeap::verify_region_lists_locked() { | |
4698 HeapRegion* unclean = _unclean_region_list.hd(); | |
4699 while (unclean != NULL) { | |
4700 guarantee(unclean->is_on_unclean_list(), "Well, it is!"); | |
4701 guarantee(!unclean->is_on_free_list(), "Well, it shouldn't be!"); | |
4702 guarantee(unclean->zero_fill_state() != HeapRegion::Allocated, | |
4703 "Everything else is possible."); | |
4704 unclean = unclean->next_from_unclean_list(); | |
4705 } | |
4706 guarantee(_unclean_region_list.sz() == unclean_region_list_length(), "Inv"); | |
4707 | |
4708 HeapRegion* free_r = _free_region_list; | |
4709 while (free_r != NULL) { | |
4710 assert(free_r->is_on_free_list(), "Well, it is!"); | |
4711 assert(!free_r->is_on_unclean_list(), "Well, it shouldn't be!"); | |
4712 switch (free_r->zero_fill_state()) { | |
4713 case HeapRegion::NotZeroFilled: | |
4714 case HeapRegion::ZeroFilling: | |
4715 guarantee(false, "Should not be on free list."); | |
4716 break; | |
4717 default: | |
4718 // Everything else is possible. | |
4719 break; | |
4720 } | |
4721 free_r = free_r->next_from_free_list(); | |
4722 } | |
4723 guarantee(_free_region_list_size == free_region_list_length(), "Inv"); | |
4724 // If we didn't do an assertion... | |
4725 return true; | |
4726 } | |
4727 | |
4728 size_t G1CollectedHeap::free_region_list_length() { | |
4729 assert(ZF_mon->owned_by_self(), "precondition."); | |
4730 size_t len = 0; | |
4731 HeapRegion* cur = _free_region_list; | |
4732 while (cur != NULL) { | |
4733 len++; | |
4734 cur = cur->next_from_free_list(); | |
4735 } | |
4736 return len; | |
4737 } | |
4738 | |
4739 size_t G1CollectedHeap::unclean_region_list_length() { | |
4740 assert(ZF_mon->owned_by_self(), "precondition."); | |
4741 return _unclean_region_list.length(); | |
4742 } | |
4743 | |
4744 size_t G1CollectedHeap::n_regions() { | |
4745 return _hrs->length(); | |
4746 } | |
4747 | |
4748 size_t G1CollectedHeap::max_regions() { | |
4749 return | |
4750 (size_t)align_size_up(g1_reserved_obj_bytes(), HeapRegion::GrainBytes) / | |
4751 HeapRegion::GrainBytes; | |
4752 } | |
4753 | |
4754 size_t G1CollectedHeap::free_regions() { | |
4755 /* Possibly-expensive assert. | |
4756 assert(_free_regions == count_free_regions(), | |
4757 "_free_regions is off."); | |
4758 */ | |
4759 return _free_regions; | |
4760 } | |
4761 | |
4762 bool G1CollectedHeap::should_zf() { | |
4763 return _free_region_list_size < (size_t) G1ConcZFMaxRegions; | |
4764 } | |
4765 | |
4766 class RegionCounter: public HeapRegionClosure { | |
4767 size_t _n; | |
4768 public: | |
4769 RegionCounter() : _n(0) {} | |
4770 bool doHeapRegion(HeapRegion* r) { | |
677 | 4771 if (r->is_empty()) { |
342 | 4772 assert(!r->isHumongous(), "H regions should not be empty."); |
4773 _n++; | |
4774 } | |
4775 return false; | |
4776 } | |
4777 int res() { return (int) _n; } | |
4778 }; | |
4779 | |
4780 size_t G1CollectedHeap::count_free_regions() { | |
4781 RegionCounter rc; | |
4782 heap_region_iterate(&rc); | |
4783 size_t n = rc.res(); | |
4784 if (_cur_alloc_region != NULL && _cur_alloc_region->is_empty()) | |
4785 n--; | |
4786 return n; | |
4787 } | |
4788 | |
4789 size_t G1CollectedHeap::count_free_regions_list() { | |
4790 size_t n = 0; | |
4791 size_t o = 0; | |
4792 ZF_mon->lock_without_safepoint_check(); | |
4793 HeapRegion* cur = _free_region_list; | |
4794 while (cur != NULL) { | |
4795 cur = cur->next_from_free_list(); | |
4796 n++; | |
4797 } | |
4798 size_t m = unclean_region_list_length(); | |
4799 ZF_mon->unlock(); | |
4800 return n + m; | |
4801 } | |
4802 | |
4803 bool G1CollectedHeap::should_set_young_locked() { | |
4804 assert(heap_lock_held_for_gc(), | |
4805 "the heap lock should already be held by or for this thread"); | |
4806 return (g1_policy()->in_young_gc_mode() && | |
4807 g1_policy()->should_add_next_region_to_young_list()); | |
4808 } | |
4809 | |
4810 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
4811 assert(heap_lock_held_for_gc(), | |
4812 "the heap lock should already be held by or for this thread"); | |
4813 _young_list->push_region(hr); | |
4814 g1_policy()->set_region_short_lived(hr); | |
4815 } | |
4816 | |
4817 class NoYoungRegionsClosure: public HeapRegionClosure { | |
4818 private: | |
4819 bool _success; | |
4820 public: | |
4821 NoYoungRegionsClosure() : _success(true) { } | |
4822 bool doHeapRegion(HeapRegion* r) { | |
4823 if (r->is_young()) { | |
4824 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
4825 r->bottom(), r->end()); | |
4826 _success = false; | |
4827 } | |
4828 return false; | |
4829 } | |
4830 bool success() { return _success; } | |
4831 }; | |
4832 | |
4833 bool G1CollectedHeap::check_young_list_empty(bool ignore_scan_only_list, | |
4834 bool check_sample) { | |
4835 bool ret = true; | |
4836 | |
4837 ret = _young_list->check_list_empty(ignore_scan_only_list, check_sample); | |
4838 if (!ignore_scan_only_list) { | |
4839 NoYoungRegionsClosure closure; | |
4840 heap_region_iterate(&closure); | |
4841 ret = ret && closure.success(); | |
4842 } | |
4843 | |
4844 return ret; | |
4845 } | |
4846 | |
4847 void G1CollectedHeap::empty_young_list() { | |
4848 assert(heap_lock_held_for_gc(), | |
4849 "the heap lock should already be held by or for this thread"); | |
4850 assert(g1_policy()->in_young_gc_mode(), "should be in young GC mode"); | |
4851 | |
4852 _young_list->empty_list(); | |
4853 } | |
4854 | |
4855 bool G1CollectedHeap::all_alloc_regions_no_allocs_since_save_marks() { | |
4856 bool no_allocs = true; | |
4857 for (int ap = 0; ap < GCAllocPurposeCount && no_allocs; ++ap) { | |
4858 HeapRegion* r = _gc_alloc_regions[ap]; | |
4859 no_allocs = r == NULL || r->saved_mark_at_top(); | |
4860 } | |
4861 return no_allocs; | |
4862 } | |
4863 | |
545 | 4864 void G1CollectedHeap::retire_all_alloc_regions() { |
342 | 4865 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
4866 HeapRegion* r = _gc_alloc_regions[ap]; | |
4867 if (r != NULL) { | |
4868 // Check for aliases. | |
4869 bool has_processed_alias = false; | |
4870 for (int i = 0; i < ap; ++i) { | |
4871 if (_gc_alloc_regions[i] == r) { | |
4872 has_processed_alias = true; | |
4873 break; | |
4874 } | |
4875 } | |
4876 if (!has_processed_alias) { | |
545 | 4877 retire_alloc_region(r, false /* par */); |
342 | 4878 } |
4879 } | |
4880 } | |
4881 } | |
4882 | |
4883 | |
4884 // Done at the start of full GC. | |
4885 void G1CollectedHeap::tear_down_region_lists() { | |
4886 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4887 while (pop_unclean_region_list_locked() != NULL) ; | |
4888 assert(_unclean_region_list.hd() == NULL && _unclean_region_list.sz() == 0, | |
4889 "Postconditions of loop.") | |
4890 while (pop_free_region_list_locked() != NULL) ; | |
4891 assert(_free_region_list == NULL, "Postcondition of loop."); | |
4892 if (_free_region_list_size != 0) { | |
4893 gclog_or_tty->print_cr("Size is %d.", _free_region_list_size); | |
838
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6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
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811
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|
4894 print_on(gclog_or_tty, true /* extended */); |
342 | 4895 } |
4896 assert(_free_region_list_size == 0, "Postconditions of loop."); | |
4897 } | |
4898 | |
4899 | |
4900 class RegionResetter: public HeapRegionClosure { | |
4901 G1CollectedHeap* _g1; | |
4902 int _n; | |
4903 public: | |
4904 RegionResetter() : _g1(G1CollectedHeap::heap()), _n(0) {} | |
4905 bool doHeapRegion(HeapRegion* r) { | |
4906 if (r->continuesHumongous()) return false; | |
4907 if (r->top() > r->bottom()) { | |
4908 if (r->top() < r->end()) { | |
4909 Copy::fill_to_words(r->top(), | |
4910 pointer_delta(r->end(), r->top())); | |
4911 } | |
4912 r->set_zero_fill_allocated(); | |
4913 } else { | |
4914 assert(r->is_empty(), "tautology"); | |
677 | 4915 _n++; |
4916 switch (r->zero_fill_state()) { | |
342 | 4917 case HeapRegion::NotZeroFilled: |
4918 case HeapRegion::ZeroFilling: | |
4919 _g1->put_region_on_unclean_list_locked(r); | |
4920 break; | |
4921 case HeapRegion::Allocated: | |
4922 r->set_zero_fill_complete(); | |
4923 // no break; go on to put on free list. | |
4924 case HeapRegion::ZeroFilled: | |
4925 _g1->put_free_region_on_list_locked(r); | |
4926 break; | |
4927 } | |
4928 } | |
4929 return false; | |
4930 } | |
4931 | |
4932 int getFreeRegionCount() {return _n;} | |
4933 }; | |
4934 | |
4935 // Done at the end of full GC. | |
4936 void G1CollectedHeap::rebuild_region_lists() { | |
4937 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4938 // This needs to go at the end of the full GC. | |
4939 RegionResetter rs; | |
4940 heap_region_iterate(&rs); | |
4941 _free_regions = rs.getFreeRegionCount(); | |
4942 // Tell the ZF thread it may have work to do. | |
4943 if (should_zf()) ZF_mon->notify_all(); | |
4944 } | |
4945 | |
4946 class UsedRegionsNeedZeroFillSetter: public HeapRegionClosure { | |
4947 G1CollectedHeap* _g1; | |
4948 int _n; | |
4949 public: | |
4950 UsedRegionsNeedZeroFillSetter() : _g1(G1CollectedHeap::heap()), _n(0) {} | |
4951 bool doHeapRegion(HeapRegion* r) { | |
4952 if (r->continuesHumongous()) return false; | |
4953 if (r->top() > r->bottom()) { | |
4954 // There are assertions in "set_zero_fill_needed()" below that | |
4955 // require top() == bottom(), so this is technically illegal. | |
4956 // We'll skirt the law here, by making that true temporarily. | |
4957 DEBUG_ONLY(HeapWord* save_top = r->top(); | |
4958 r->set_top(r->bottom())); | |
4959 r->set_zero_fill_needed(); | |
4960 DEBUG_ONLY(r->set_top(save_top)); | |
4961 } | |
4962 return false; | |
4963 } | |
4964 }; | |
4965 | |
4966 // Done at the start of full GC. | |
4967 void G1CollectedHeap::set_used_regions_to_need_zero_fill() { | |
4968 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4969 // This needs to go at the end of the full GC. | |
4970 UsedRegionsNeedZeroFillSetter rs; | |
4971 heap_region_iterate(&rs); | |
4972 } | |
4973 | |
4974 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
4975 _refine_cte_cl->set_concurrent(concurrent); | |
4976 } | |
4977 | |
4978 #ifndef PRODUCT | |
4979 | |
4980 class PrintHeapRegionClosure: public HeapRegionClosure { | |
4981 public: | |
4982 bool doHeapRegion(HeapRegion *r) { | |
4983 gclog_or_tty->print("Region: "PTR_FORMAT":", r); | |
4984 if (r != NULL) { | |
4985 if (r->is_on_free_list()) | |
4986 gclog_or_tty->print("Free "); | |
4987 if (r->is_young()) | |
4988 gclog_or_tty->print("Young "); | |
4989 if (r->isHumongous()) | |
4990 gclog_or_tty->print("Is Humongous "); | |
4991 r->print(); | |
4992 } | |
4993 return false; | |
4994 } | |
4995 }; | |
4996 | |
4997 class SortHeapRegionClosure : public HeapRegionClosure { | |
4998 size_t young_regions,free_regions, unclean_regions; | |
4999 size_t hum_regions, count; | |
5000 size_t unaccounted, cur_unclean, cur_alloc; | |
5001 size_t total_free; | |
5002 HeapRegion* cur; | |
5003 public: | |
5004 SortHeapRegionClosure(HeapRegion *_cur) : cur(_cur), young_regions(0), | |
5005 free_regions(0), unclean_regions(0), | |
5006 hum_regions(0), | |
5007 count(0), unaccounted(0), | |
5008 cur_alloc(0), total_free(0) | |
5009 {} | |
5010 bool doHeapRegion(HeapRegion *r) { | |
5011 count++; | |
5012 if (r->is_on_free_list()) free_regions++; | |
5013 else if (r->is_on_unclean_list()) unclean_regions++; | |
5014 else if (r->isHumongous()) hum_regions++; | |
5015 else if (r->is_young()) young_regions++; | |
5016 else if (r == cur) cur_alloc++; | |
5017 else unaccounted++; | |
5018 return false; | |
5019 } | |
5020 void print() { | |
5021 total_free = free_regions + unclean_regions; | |
5022 gclog_or_tty->print("%d regions\n", count); | |
5023 gclog_or_tty->print("%d free: free_list = %d unclean = %d\n", | |
5024 total_free, free_regions, unclean_regions); | |
5025 gclog_or_tty->print("%d humongous %d young\n", | |
5026 hum_regions, young_regions); | |
5027 gclog_or_tty->print("%d cur_alloc\n", cur_alloc); | |
5028 gclog_or_tty->print("UHOH unaccounted = %d\n", unaccounted); | |
5029 } | |
5030 }; | |
5031 | |
5032 void G1CollectedHeap::print_region_counts() { | |
5033 SortHeapRegionClosure sc(_cur_alloc_region); | |
5034 PrintHeapRegionClosure cl; | |
5035 heap_region_iterate(&cl); | |
5036 heap_region_iterate(&sc); | |
5037 sc.print(); | |
5038 print_region_accounting_info(); | |
5039 }; | |
5040 | |
5041 bool G1CollectedHeap::regions_accounted_for() { | |
5042 // TODO: regions accounting for young/survivor/tenured | |
5043 return true; | |
5044 } | |
5045 | |
5046 bool G1CollectedHeap::print_region_accounting_info() { | |
5047 gclog_or_tty->print_cr("Free regions: %d (count: %d count list %d) (clean: %d unclean: %d).", | |
5048 free_regions(), | |
5049 count_free_regions(), count_free_regions_list(), | |
5050 _free_region_list_size, _unclean_region_list.sz()); | |
5051 gclog_or_tty->print_cr("cur_alloc: %d.", | |
5052 (_cur_alloc_region == NULL ? 0 : 1)); | |
5053 gclog_or_tty->print_cr("H regions: %d.", _num_humongous_regions); | |
5054 | |
5055 // TODO: check regions accounting for young/survivor/tenured | |
5056 return true; | |
5057 } | |
5058 | |
5059 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
5060 HeapRegion* hr = heap_region_containing(p); | |
5061 if (hr == NULL) { | |
5062 return is_in_permanent(p); | |
5063 } else { | |
5064 return hr->is_in(p); | |
5065 } | |
5066 } | |
5067 #endif // PRODUCT | |
5068 | |
5069 void G1CollectedHeap::g1_unimplemented() { | |
5070 // Unimplemented(); | |
5071 } |