Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 642:660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
Summary: Use zero based compressed oops if java heap is below 32gb and unscaled compressed oops if java heap is below 4gb.
Reviewed-by: never, twisti, jcoomes, coleenp
author | kvn |
---|---|
date | Thu, 12 Mar 2009 10:37:46 -0700 |
parents | bcedf688d882 |
children | bd441136a5ce |
rev | line source |
---|---|
342 | 1 /* |
470 | 2 * Copyright 2001-2008 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 // Finds the first HeapRegion. | |
46 // No longer used, but might be handy someday. | |
47 | |
48 class FindFirstRegionClosure: public HeapRegionClosure { | |
49 HeapRegion* _a_region; | |
50 public: | |
51 FindFirstRegionClosure() : _a_region(NULL) {} | |
52 bool doHeapRegion(HeapRegion* r) { | |
53 _a_region = r; | |
54 return true; | |
55 } | |
56 HeapRegion* result() { return _a_region; } | |
57 }; | |
58 | |
59 | |
60 class RefineCardTableEntryClosure: public CardTableEntryClosure { | |
61 SuspendibleThreadSet* _sts; | |
62 G1RemSet* _g1rs; | |
63 ConcurrentG1Refine* _cg1r; | |
64 bool _concurrent; | |
65 public: | |
66 RefineCardTableEntryClosure(SuspendibleThreadSet* sts, | |
67 G1RemSet* g1rs, | |
68 ConcurrentG1Refine* cg1r) : | |
69 _sts(sts), _g1rs(g1rs), _cg1r(cg1r), _concurrent(true) | |
70 {} | |
71 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
72 _g1rs->concurrentRefineOneCard(card_ptr, worker_i); | |
73 if (_concurrent && _sts->should_yield()) { | |
74 // Caller will actually yield. | |
75 return false; | |
76 } | |
77 // Otherwise, we finished successfully; return true. | |
78 return true; | |
79 } | |
80 void set_concurrent(bool b) { _concurrent = b; } | |
81 }; | |
82 | |
83 | |
84 class ClearLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
85 int _calls; | |
86 G1CollectedHeap* _g1h; | |
87 CardTableModRefBS* _ctbs; | |
88 int _histo[256]; | |
89 public: | |
90 ClearLoggedCardTableEntryClosure() : | |
91 _calls(0) | |
92 { | |
93 _g1h = G1CollectedHeap::heap(); | |
94 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
95 for (int i = 0; i < 256; i++) _histo[i] = 0; | |
96 } | |
97 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
98 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
99 _calls++; | |
100 unsigned char* ujb = (unsigned char*)card_ptr; | |
101 int ind = (int)(*ujb); | |
102 _histo[ind]++; | |
103 *card_ptr = -1; | |
104 } | |
105 return true; | |
106 } | |
107 int calls() { return _calls; } | |
108 void print_histo() { | |
109 gclog_or_tty->print_cr("Card table value histogram:"); | |
110 for (int i = 0; i < 256; i++) { | |
111 if (_histo[i] != 0) { | |
112 gclog_or_tty->print_cr(" %d: %d", i, _histo[i]); | |
113 } | |
114 } | |
115 } | |
116 }; | |
117 | |
118 class RedirtyLoggedCardTableEntryClosure: public CardTableEntryClosure { | |
119 int _calls; | |
120 G1CollectedHeap* _g1h; | |
121 CardTableModRefBS* _ctbs; | |
122 public: | |
123 RedirtyLoggedCardTableEntryClosure() : | |
124 _calls(0) | |
125 { | |
126 _g1h = G1CollectedHeap::heap(); | |
127 _ctbs = (CardTableModRefBS*)_g1h->barrier_set(); | |
128 } | |
129 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
130 if (_g1h->is_in_reserved(_ctbs->addr_for(card_ptr))) { | |
131 _calls++; | |
132 *card_ptr = 0; | |
133 } | |
134 return true; | |
135 } | |
136 int calls() { return _calls; } | |
137 }; | |
138 | |
616
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139 class RedirtyLoggedCardTableEntryFastClosure : public CardTableEntryClosure { |
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140 public: |
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141 bool do_card_ptr(jbyte* card_ptr, int worker_i) { |
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142 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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143 return true; |
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144 } |
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145 }; |
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146 |
342 | 147 YoungList::YoungList(G1CollectedHeap* g1h) |
148 : _g1h(g1h), _head(NULL), | |
149 _scan_only_head(NULL), _scan_only_tail(NULL), _curr_scan_only(NULL), | |
150 _length(0), _scan_only_length(0), | |
151 _last_sampled_rs_lengths(0), | |
545 | 152 _survivor_head(NULL), _survivor_tail(NULL), _survivor_length(0) |
342 | 153 { |
154 guarantee( check_list_empty(false), "just making sure..." ); | |
155 } | |
156 | |
157 void YoungList::push_region(HeapRegion *hr) { | |
158 assert(!hr->is_young(), "should not already be young"); | |
159 assert(hr->get_next_young_region() == NULL, "cause it should!"); | |
160 | |
161 hr->set_next_young_region(_head); | |
162 _head = hr; | |
163 | |
164 hr->set_young(); | |
165 double yg_surv_rate = _g1h->g1_policy()->predict_yg_surv_rate((int)_length); | |
166 ++_length; | |
167 } | |
168 | |
169 void YoungList::add_survivor_region(HeapRegion* hr) { | |
545 | 170 assert(hr->is_survivor(), "should be flagged as survivor region"); |
342 | 171 assert(hr->get_next_young_region() == NULL, "cause it should!"); |
172 | |
173 hr->set_next_young_region(_survivor_head); | |
174 if (_survivor_head == NULL) { | |
545 | 175 _survivor_tail = hr; |
342 | 176 } |
177 _survivor_head = hr; | |
178 | |
179 ++_survivor_length; | |
180 } | |
181 | |
182 HeapRegion* YoungList::pop_region() { | |
183 while (_head != NULL) { | |
184 assert( length() > 0, "list should not be empty" ); | |
185 HeapRegion* ret = _head; | |
186 _head = ret->get_next_young_region(); | |
187 ret->set_next_young_region(NULL); | |
188 --_length; | |
189 assert(ret->is_young(), "region should be very young"); | |
190 | |
191 // Replace 'Survivor' region type with 'Young'. So the region will | |
192 // be treated as a young region and will not be 'confused' with | |
193 // newly created survivor regions. | |
194 if (ret->is_survivor()) { | |
195 ret->set_young(); | |
196 } | |
197 | |
198 if (!ret->is_scan_only()) { | |
199 return ret; | |
200 } | |
201 | |
202 // scan-only, we'll add it to the scan-only list | |
203 if (_scan_only_tail == NULL) { | |
204 guarantee( _scan_only_head == NULL, "invariant" ); | |
205 | |
206 _scan_only_head = ret; | |
207 _curr_scan_only = ret; | |
208 } else { | |
209 guarantee( _scan_only_head != NULL, "invariant" ); | |
210 _scan_only_tail->set_next_young_region(ret); | |
211 } | |
212 guarantee( ret->get_next_young_region() == NULL, "invariant" ); | |
213 _scan_only_tail = ret; | |
214 | |
215 // no need to be tagged as scan-only any more | |
216 ret->set_young(); | |
217 | |
218 ++_scan_only_length; | |
219 } | |
220 assert( length() == 0, "list should be empty" ); | |
221 return NULL; | |
222 } | |
223 | |
224 void YoungList::empty_list(HeapRegion* list) { | |
225 while (list != NULL) { | |
226 HeapRegion* next = list->get_next_young_region(); | |
227 list->set_next_young_region(NULL); | |
228 list->uninstall_surv_rate_group(); | |
229 list->set_not_young(); | |
230 list = next; | |
231 } | |
232 } | |
233 | |
234 void YoungList::empty_list() { | |
235 assert(check_list_well_formed(), "young list should be well formed"); | |
236 | |
237 empty_list(_head); | |
238 _head = NULL; | |
239 _length = 0; | |
240 | |
241 empty_list(_scan_only_head); | |
242 _scan_only_head = NULL; | |
243 _scan_only_tail = NULL; | |
244 _scan_only_length = 0; | |
245 _curr_scan_only = NULL; | |
246 | |
247 empty_list(_survivor_head); | |
248 _survivor_head = NULL; | |
545 | 249 _survivor_tail = NULL; |
342 | 250 _survivor_length = 0; |
251 | |
252 _last_sampled_rs_lengths = 0; | |
253 | |
254 assert(check_list_empty(false), "just making sure..."); | |
255 } | |
256 | |
257 bool YoungList::check_list_well_formed() { | |
258 bool ret = true; | |
259 | |
260 size_t length = 0; | |
261 HeapRegion* curr = _head; | |
262 HeapRegion* last = NULL; | |
263 while (curr != NULL) { | |
264 if (!curr->is_young() || curr->is_scan_only()) { | |
265 gclog_or_tty->print_cr("### YOUNG REGION "PTR_FORMAT"-"PTR_FORMAT" " | |
266 "incorrectly tagged (%d, %d)", | |
267 curr->bottom(), curr->end(), | |
268 curr->is_young(), curr->is_scan_only()); | |
269 ret = false; | |
270 } | |
271 ++length; | |
272 last = curr; | |
273 curr = curr->get_next_young_region(); | |
274 } | |
275 ret = ret && (length == _length); | |
276 | |
277 if (!ret) { | |
278 gclog_or_tty->print_cr("### YOUNG LIST seems not well formed!"); | |
279 gclog_or_tty->print_cr("### list has %d entries, _length is %d", | |
280 length, _length); | |
281 } | |
282 | |
283 bool scan_only_ret = true; | |
284 length = 0; | |
285 curr = _scan_only_head; | |
286 last = NULL; | |
287 while (curr != NULL) { | |
288 if (!curr->is_young() || curr->is_scan_only()) { | |
289 gclog_or_tty->print_cr("### SCAN-ONLY REGION "PTR_FORMAT"-"PTR_FORMAT" " | |
290 "incorrectly tagged (%d, %d)", | |
291 curr->bottom(), curr->end(), | |
292 curr->is_young(), curr->is_scan_only()); | |
293 scan_only_ret = false; | |
294 } | |
295 ++length; | |
296 last = curr; | |
297 curr = curr->get_next_young_region(); | |
298 } | |
299 scan_only_ret = scan_only_ret && (length == _scan_only_length); | |
300 | |
301 if ( (last != _scan_only_tail) || | |
302 (_scan_only_head == NULL && _scan_only_tail != NULL) || | |
303 (_scan_only_head != NULL && _scan_only_tail == NULL) ) { | |
304 gclog_or_tty->print_cr("## _scan_only_tail is set incorrectly"); | |
305 scan_only_ret = false; | |
306 } | |
307 | |
308 if (_curr_scan_only != NULL && _curr_scan_only != _scan_only_head) { | |
309 gclog_or_tty->print_cr("### _curr_scan_only is set incorrectly"); | |
310 scan_only_ret = false; | |
311 } | |
312 | |
313 if (!scan_only_ret) { | |
314 gclog_or_tty->print_cr("### SCAN-ONLY LIST seems not well formed!"); | |
315 gclog_or_tty->print_cr("### list has %d entries, _scan_only_length is %d", | |
316 length, _scan_only_length); | |
317 } | |
318 | |
319 return ret && scan_only_ret; | |
320 } | |
321 | |
322 bool YoungList::check_list_empty(bool ignore_scan_only_list, | |
323 bool check_sample) { | |
324 bool ret = true; | |
325 | |
326 if (_length != 0) { | |
327 gclog_or_tty->print_cr("### YOUNG LIST should have 0 length, not %d", | |
328 _length); | |
329 ret = false; | |
330 } | |
331 if (check_sample && _last_sampled_rs_lengths != 0) { | |
332 gclog_or_tty->print_cr("### YOUNG LIST has non-zero last sampled RS lengths"); | |
333 ret = false; | |
334 } | |
335 if (_head != NULL) { | |
336 gclog_or_tty->print_cr("### YOUNG LIST does not have a NULL head"); | |
337 ret = false; | |
338 } | |
339 if (!ret) { | |
340 gclog_or_tty->print_cr("### YOUNG LIST does not seem empty"); | |
341 } | |
342 | |
343 if (ignore_scan_only_list) | |
344 return ret; | |
345 | |
346 bool scan_only_ret = true; | |
347 if (_scan_only_length != 0) { | |
348 gclog_or_tty->print_cr("### SCAN-ONLY LIST should have 0 length, not %d", | |
349 _scan_only_length); | |
350 scan_only_ret = false; | |
351 } | |
352 if (_scan_only_head != NULL) { | |
353 gclog_or_tty->print_cr("### SCAN-ONLY LIST does not have a NULL head"); | |
354 scan_only_ret = false; | |
355 } | |
356 if (_scan_only_tail != NULL) { | |
357 gclog_or_tty->print_cr("### SCAN-ONLY LIST does not have a NULL tail"); | |
358 scan_only_ret = false; | |
359 } | |
360 if (!scan_only_ret) { | |
361 gclog_or_tty->print_cr("### SCAN-ONLY LIST does not seem empty"); | |
362 } | |
363 | |
364 return ret && scan_only_ret; | |
365 } | |
366 | |
367 void | |
368 YoungList::rs_length_sampling_init() { | |
369 _sampled_rs_lengths = 0; | |
370 _curr = _head; | |
371 } | |
372 | |
373 bool | |
374 YoungList::rs_length_sampling_more() { | |
375 return _curr != NULL; | |
376 } | |
377 | |
378 void | |
379 YoungList::rs_length_sampling_next() { | |
380 assert( _curr != NULL, "invariant" ); | |
381 _sampled_rs_lengths += _curr->rem_set()->occupied(); | |
382 _curr = _curr->get_next_young_region(); | |
383 if (_curr == NULL) { | |
384 _last_sampled_rs_lengths = _sampled_rs_lengths; | |
385 // gclog_or_tty->print_cr("last sampled RS lengths = %d", _last_sampled_rs_lengths); | |
386 } | |
387 } | |
388 | |
389 void | |
390 YoungList::reset_auxilary_lists() { | |
391 // We could have just "moved" the scan-only list to the young list. | |
392 // However, the scan-only list is ordered according to the region | |
393 // age in descending order, so, by moving one entry at a time, we | |
394 // ensure that it is recreated in ascending order. | |
395 | |
396 guarantee( is_empty(), "young list should be empty" ); | |
397 assert(check_list_well_formed(), "young list should be well formed"); | |
398 | |
399 // Add survivor regions to SurvRateGroup. | |
400 _g1h->g1_policy()->note_start_adding_survivor_regions(); | |
545 | 401 _g1h->g1_policy()->finished_recalculating_age_indexes(true /* is_survivors */); |
342 | 402 for (HeapRegion* curr = _survivor_head; |
403 curr != NULL; | |
404 curr = curr->get_next_young_region()) { | |
405 _g1h->g1_policy()->set_region_survivors(curr); | |
406 } | |
407 _g1h->g1_policy()->note_stop_adding_survivor_regions(); | |
408 | |
409 if (_survivor_head != NULL) { | |
410 _head = _survivor_head; | |
411 _length = _survivor_length + _scan_only_length; | |
545 | 412 _survivor_tail->set_next_young_region(_scan_only_head); |
342 | 413 } else { |
414 _head = _scan_only_head; | |
415 _length = _scan_only_length; | |
416 } | |
417 | |
418 for (HeapRegion* curr = _scan_only_head; | |
419 curr != NULL; | |
420 curr = curr->get_next_young_region()) { | |
421 curr->recalculate_age_in_surv_rate_group(); | |
422 } | |
423 _scan_only_head = NULL; | |
424 _scan_only_tail = NULL; | |
425 _scan_only_length = 0; | |
426 _curr_scan_only = NULL; | |
427 | |
428 _survivor_head = NULL; | |
545 | 429 _survivor_tail = NULL; |
342 | 430 _survivor_length = 0; |
545 | 431 _g1h->g1_policy()->finished_recalculating_age_indexes(false /* is_survivors */); |
342 | 432 |
433 assert(check_list_well_formed(), "young list should be well formed"); | |
434 } | |
435 | |
436 void YoungList::print() { | |
437 HeapRegion* lists[] = {_head, _scan_only_head, _survivor_head}; | |
438 const char* names[] = {"YOUNG", "SCAN-ONLY", "SURVIVOR"}; | |
439 | |
440 for (unsigned int list = 0; list < ARRAY_SIZE(lists); ++list) { | |
441 gclog_or_tty->print_cr("%s LIST CONTENTS", names[list]); | |
442 HeapRegion *curr = lists[list]; | |
443 if (curr == NULL) | |
444 gclog_or_tty->print_cr(" empty"); | |
445 while (curr != NULL) { | |
446 gclog_or_tty->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " | |
447 "age: %4d, y: %d, s-o: %d, surv: %d", | |
448 curr->bottom(), curr->end(), | |
449 curr->top(), | |
450 curr->prev_top_at_mark_start(), | |
451 curr->next_top_at_mark_start(), | |
452 curr->top_at_conc_mark_count(), | |
453 curr->age_in_surv_rate_group_cond(), | |
454 curr->is_young(), | |
455 curr->is_scan_only(), | |
456 curr->is_survivor()); | |
457 curr = curr->get_next_young_region(); | |
458 } | |
459 } | |
460 | |
461 gclog_or_tty->print_cr(""); | |
462 } | |
463 | |
464 void G1CollectedHeap::stop_conc_gc_threads() { | |
465 _cg1r->cg1rThread()->stop(); | |
466 _czft->stop(); | |
467 _cmThread->stop(); | |
468 } | |
469 | |
470 | |
471 void G1CollectedHeap::check_ct_logs_at_safepoint() { | |
472 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
473 CardTableModRefBS* ct_bs = (CardTableModRefBS*)barrier_set(); | |
474 | |
475 // Count the dirty cards at the start. | |
476 CountNonCleanMemRegionClosure count1(this); | |
477 ct_bs->mod_card_iterate(&count1); | |
478 int orig_count = count1.n(); | |
479 | |
480 // First clear the logged cards. | |
481 ClearLoggedCardTableEntryClosure clear; | |
482 dcqs.set_closure(&clear); | |
483 dcqs.apply_closure_to_all_completed_buffers(); | |
484 dcqs.iterate_closure_all_threads(false); | |
485 clear.print_histo(); | |
486 | |
487 // Now ensure that there's no dirty cards. | |
488 CountNonCleanMemRegionClosure count2(this); | |
489 ct_bs->mod_card_iterate(&count2); | |
490 if (count2.n() != 0) { | |
491 gclog_or_tty->print_cr("Card table has %d entries; %d originally", | |
492 count2.n(), orig_count); | |
493 } | |
494 guarantee(count2.n() == 0, "Card table should be clean."); | |
495 | |
496 RedirtyLoggedCardTableEntryClosure redirty; | |
497 JavaThread::dirty_card_queue_set().set_closure(&redirty); | |
498 dcqs.apply_closure_to_all_completed_buffers(); | |
499 dcqs.iterate_closure_all_threads(false); | |
500 gclog_or_tty->print_cr("Log entries = %d, dirty cards = %d.", | |
501 clear.calls(), orig_count); | |
502 guarantee(redirty.calls() == clear.calls(), | |
503 "Or else mechanism is broken."); | |
504 | |
505 CountNonCleanMemRegionClosure count3(this); | |
506 ct_bs->mod_card_iterate(&count3); | |
507 if (count3.n() != orig_count) { | |
508 gclog_or_tty->print_cr("Should have restored them all: orig = %d, final = %d.", | |
509 orig_count, count3.n()); | |
510 guarantee(count3.n() >= orig_count, "Should have restored them all."); | |
511 } | |
512 | |
513 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
514 } | |
515 | |
516 // Private class members. | |
517 | |
518 G1CollectedHeap* G1CollectedHeap::_g1h; | |
519 | |
520 // Private methods. | |
521 | |
522 // Finds a HeapRegion that can be used to allocate a given size of block. | |
523 | |
524 | |
525 HeapRegion* G1CollectedHeap::newAllocRegion_work(size_t word_size, | |
526 bool do_expand, | |
527 bool zero_filled) { | |
528 ConcurrentZFThread::note_region_alloc(); | |
529 HeapRegion* res = alloc_free_region_from_lists(zero_filled); | |
530 if (res == NULL && do_expand) { | |
531 expand(word_size * HeapWordSize); | |
532 res = alloc_free_region_from_lists(zero_filled); | |
533 assert(res == NULL || | |
534 (!res->isHumongous() && | |
535 (!zero_filled || | |
536 res->zero_fill_state() == HeapRegion::Allocated)), | |
537 "Alloc Regions must be zero filled (and non-H)"); | |
538 } | |
539 if (res != NULL && res->is_empty()) _free_regions--; | |
540 assert(res == NULL || | |
541 (!res->isHumongous() && | |
542 (!zero_filled || | |
543 res->zero_fill_state() == HeapRegion::Allocated)), | |
544 "Non-young alloc Regions must be zero filled (and non-H)"); | |
545 | |
546 if (G1TraceRegions) { | |
547 if (res != NULL) { | |
548 gclog_or_tty->print_cr("new alloc region %d:["PTR_FORMAT", "PTR_FORMAT"], " | |
549 "top "PTR_FORMAT, | |
550 res->hrs_index(), res->bottom(), res->end(), res->top()); | |
551 } | |
552 } | |
553 | |
554 return res; | |
555 } | |
556 | |
557 HeapRegion* G1CollectedHeap::newAllocRegionWithExpansion(int purpose, | |
558 size_t word_size, | |
559 bool zero_filled) { | |
560 HeapRegion* alloc_region = NULL; | |
561 if (_gc_alloc_region_counts[purpose] < g1_policy()->max_regions(purpose)) { | |
562 alloc_region = newAllocRegion_work(word_size, true, zero_filled); | |
563 if (purpose == GCAllocForSurvived && alloc_region != NULL) { | |
545 | 564 alloc_region->set_survivor(); |
342 | 565 } |
566 ++_gc_alloc_region_counts[purpose]; | |
567 } else { | |
568 g1_policy()->note_alloc_region_limit_reached(purpose); | |
569 } | |
570 return alloc_region; | |
571 } | |
572 | |
573 // If could fit into free regions w/o expansion, try. | |
574 // Otherwise, if can expand, do so. | |
575 // Otherwise, if using ex regions might help, try with ex given back. | |
576 HeapWord* G1CollectedHeap::humongousObjAllocate(size_t word_size) { | |
577 assert(regions_accounted_for(), "Region leakage!"); | |
578 | |
579 // We can't allocate H regions while cleanupComplete is running, since | |
580 // some of the regions we find to be empty might not yet be added to the | |
581 // unclean list. (If we're already at a safepoint, this call is | |
582 // unnecessary, not to mention wrong.) | |
583 if (!SafepointSynchronize::is_at_safepoint()) | |
584 wait_for_cleanup_complete(); | |
585 | |
586 size_t num_regions = | |
587 round_to(word_size, HeapRegion::GrainWords) / HeapRegion::GrainWords; | |
588 | |
589 // Special case if < one region??? | |
590 | |
591 // Remember the ft size. | |
592 size_t x_size = expansion_regions(); | |
593 | |
594 HeapWord* res = NULL; | |
595 bool eliminated_allocated_from_lists = false; | |
596 | |
597 // Can the allocation potentially fit in the free regions? | |
598 if (free_regions() >= num_regions) { | |
599 res = _hrs->obj_allocate(word_size); | |
600 } | |
601 if (res == NULL) { | |
602 // Try expansion. | |
603 size_t fs = _hrs->free_suffix(); | |
604 if (fs + x_size >= num_regions) { | |
605 expand((num_regions - fs) * HeapRegion::GrainBytes); | |
606 res = _hrs->obj_allocate(word_size); | |
607 assert(res != NULL, "This should have worked."); | |
608 } else { | |
609 // Expansion won't help. Are there enough free regions if we get rid | |
610 // of reservations? | |
611 size_t avail = free_regions(); | |
612 if (avail >= num_regions) { | |
613 res = _hrs->obj_allocate(word_size); | |
614 if (res != NULL) { | |
615 remove_allocated_regions_from_lists(); | |
616 eliminated_allocated_from_lists = true; | |
617 } | |
618 } | |
619 } | |
620 } | |
621 if (res != NULL) { | |
622 // Increment by the number of regions allocated. | |
623 // FIXME: Assumes regions all of size GrainBytes. | |
624 #ifndef PRODUCT | |
625 mr_bs()->verify_clean_region(MemRegion(res, res + num_regions * | |
626 HeapRegion::GrainWords)); | |
627 #endif | |
628 if (!eliminated_allocated_from_lists) | |
629 remove_allocated_regions_from_lists(); | |
630 _summary_bytes_used += word_size * HeapWordSize; | |
631 _free_regions -= num_regions; | |
632 _num_humongous_regions += (int) num_regions; | |
633 } | |
634 assert(regions_accounted_for(), "Region Leakage"); | |
635 return res; | |
636 } | |
637 | |
638 HeapWord* | |
639 G1CollectedHeap::attempt_allocation_slow(size_t word_size, | |
640 bool permit_collection_pause) { | |
641 HeapWord* res = NULL; | |
642 HeapRegion* allocated_young_region = NULL; | |
643 | |
644 assert( SafepointSynchronize::is_at_safepoint() || | |
645 Heap_lock->owned_by_self(), "pre condition of the call" ); | |
646 | |
647 if (isHumongous(word_size)) { | |
648 // Allocation of a humongous object can, in a sense, complete a | |
649 // partial region, if the previous alloc was also humongous, and | |
650 // caused the test below to succeed. | |
651 if (permit_collection_pause) | |
652 do_collection_pause_if_appropriate(word_size); | |
653 res = humongousObjAllocate(word_size); | |
654 assert(_cur_alloc_region == NULL | |
655 || !_cur_alloc_region->isHumongous(), | |
656 "Prevent a regression of this bug."); | |
657 | |
658 } else { | |
354
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659 // We may have concurrent cleanup working at the time. Wait for it |
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660 // to complete. In the future we would probably want to make the |
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661 // concurrent cleanup truly concurrent by decoupling it from the |
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662 // allocation. |
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663 if (!SafepointSynchronize::is_at_safepoint()) |
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664 wait_for_cleanup_complete(); |
342 | 665 // If we do a collection pause, this will be reset to a non-NULL |
666 // value. If we don't, nulling here ensures that we allocate a new | |
667 // region below. | |
668 if (_cur_alloc_region != NULL) { | |
669 // We're finished with the _cur_alloc_region. | |
670 _summary_bytes_used += _cur_alloc_region->used(); | |
671 _cur_alloc_region = NULL; | |
672 } | |
673 assert(_cur_alloc_region == NULL, "Invariant."); | |
674 // Completion of a heap region is perhaps a good point at which to do | |
675 // a collection pause. | |
676 if (permit_collection_pause) | |
677 do_collection_pause_if_appropriate(word_size); | |
678 // Make sure we have an allocation region available. | |
679 if (_cur_alloc_region == NULL) { | |
680 if (!SafepointSynchronize::is_at_safepoint()) | |
681 wait_for_cleanup_complete(); | |
682 bool next_is_young = should_set_young_locked(); | |
683 // If the next region is not young, make sure it's zero-filled. | |
684 _cur_alloc_region = newAllocRegion(word_size, !next_is_young); | |
685 if (_cur_alloc_region != NULL) { | |
686 _summary_bytes_used -= _cur_alloc_region->used(); | |
687 if (next_is_young) { | |
688 set_region_short_lived_locked(_cur_alloc_region); | |
689 allocated_young_region = _cur_alloc_region; | |
690 } | |
691 } | |
692 } | |
693 assert(_cur_alloc_region == NULL || !_cur_alloc_region->isHumongous(), | |
694 "Prevent a regression of this bug."); | |
695 | |
696 // Now retry the allocation. | |
697 if (_cur_alloc_region != NULL) { | |
698 res = _cur_alloc_region->allocate(word_size); | |
699 } | |
700 } | |
701 | |
702 // NOTE: fails frequently in PRT | |
703 assert(regions_accounted_for(), "Region leakage!"); | |
704 | |
705 if (res != NULL) { | |
706 if (!SafepointSynchronize::is_at_safepoint()) { | |
707 assert( permit_collection_pause, "invariant" ); | |
708 assert( Heap_lock->owned_by_self(), "invariant" ); | |
709 Heap_lock->unlock(); | |
710 } | |
711 | |
712 if (allocated_young_region != NULL) { | |
713 HeapRegion* hr = allocated_young_region; | |
714 HeapWord* bottom = hr->bottom(); | |
715 HeapWord* end = hr->end(); | |
716 MemRegion mr(bottom, end); | |
717 ((CardTableModRefBS*)_g1h->barrier_set())->dirty(mr); | |
718 } | |
719 } | |
720 | |
721 assert( SafepointSynchronize::is_at_safepoint() || | |
722 (res == NULL && Heap_lock->owned_by_self()) || | |
723 (res != NULL && !Heap_lock->owned_by_self()), | |
724 "post condition of the call" ); | |
725 | |
726 return res; | |
727 } | |
728 | |
729 HeapWord* | |
730 G1CollectedHeap::mem_allocate(size_t word_size, | |
731 bool is_noref, | |
732 bool is_tlab, | |
733 bool* gc_overhead_limit_was_exceeded) { | |
734 debug_only(check_for_valid_allocation_state()); | |
735 assert(no_gc_in_progress(), "Allocation during gc not allowed"); | |
736 HeapWord* result = NULL; | |
737 | |
738 // Loop until the allocation is satisified, | |
739 // or unsatisfied after GC. | |
740 for (int try_count = 1; /* return or throw */; try_count += 1) { | |
741 int gc_count_before; | |
742 { | |
743 Heap_lock->lock(); | |
744 result = attempt_allocation(word_size); | |
745 if (result != NULL) { | |
746 // attempt_allocation should have unlocked the heap lock | |
747 assert(is_in(result), "result not in heap"); | |
748 return result; | |
749 } | |
750 // Read the gc count while the heap lock is held. | |
751 gc_count_before = SharedHeap::heap()->total_collections(); | |
752 Heap_lock->unlock(); | |
753 } | |
754 | |
755 // Create the garbage collection operation... | |
756 VM_G1CollectForAllocation op(word_size, | |
757 gc_count_before); | |
758 | |
759 // ...and get the VM thread to execute it. | |
760 VMThread::execute(&op); | |
761 if (op.prologue_succeeded()) { | |
762 result = op.result(); | |
763 assert(result == NULL || is_in(result), "result not in heap"); | |
764 return result; | |
765 } | |
766 | |
767 // Give a warning if we seem to be looping forever. | |
768 if ((QueuedAllocationWarningCount > 0) && | |
769 (try_count % QueuedAllocationWarningCount == 0)) { | |
770 warning("G1CollectedHeap::mem_allocate_work retries %d times", | |
771 try_count); | |
772 } | |
773 } | |
774 } | |
775 | |
776 void G1CollectedHeap::abandon_cur_alloc_region() { | |
777 if (_cur_alloc_region != NULL) { | |
778 // We're finished with the _cur_alloc_region. | |
779 if (_cur_alloc_region->is_empty()) { | |
780 _free_regions++; | |
781 free_region(_cur_alloc_region); | |
782 } else { | |
783 _summary_bytes_used += _cur_alloc_region->used(); | |
784 } | |
785 _cur_alloc_region = NULL; | |
786 } | |
787 } | |
788 | |
789 class PostMCRemSetClearClosure: public HeapRegionClosure { | |
790 ModRefBarrierSet* _mr_bs; | |
791 public: | |
792 PostMCRemSetClearClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
793 bool doHeapRegion(HeapRegion* r) { | |
794 r->reset_gc_time_stamp(); | |
795 if (r->continuesHumongous()) | |
796 return false; | |
797 HeapRegionRemSet* hrrs = r->rem_set(); | |
798 if (hrrs != NULL) hrrs->clear(); | |
799 // You might think here that we could clear just the cards | |
800 // corresponding to the used region. But no: if we leave a dirty card | |
801 // in a region we might allocate into, then it would prevent that card | |
802 // from being enqueued, and cause it to be missed. | |
803 // Re: the performance cost: we shouldn't be doing full GC anyway! | |
804 _mr_bs->clear(MemRegion(r->bottom(), r->end())); | |
805 return false; | |
806 } | |
807 }; | |
808 | |
809 | |
810 class PostMCRemSetInvalidateClosure: public HeapRegionClosure { | |
811 ModRefBarrierSet* _mr_bs; | |
812 public: | |
813 PostMCRemSetInvalidateClosure(ModRefBarrierSet* mr_bs) : _mr_bs(mr_bs) {} | |
814 bool doHeapRegion(HeapRegion* r) { | |
815 if (r->continuesHumongous()) return false; | |
816 if (r->used_region().word_size() != 0) { | |
817 _mr_bs->invalidate(r->used_region(), true /*whole heap*/); | |
818 } | |
819 return false; | |
820 } | |
821 }; | |
822 | |
823 void G1CollectedHeap::do_collection(bool full, bool clear_all_soft_refs, | |
824 size_t word_size) { | |
825 ResourceMark rm; | |
826 | |
827 if (full && DisableExplicitGC) { | |
828 gclog_or_tty->print("\n\n\nDisabling Explicit GC\n\n\n"); | |
829 return; | |
830 } | |
831 | |
832 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
833 assert(Thread::current() == VMThread::vm_thread(), "should be in vm thread"); | |
834 | |
835 if (GC_locker::is_active()) { | |
836 return; // GC is disabled (e.g. JNI GetXXXCritical operation) | |
837 } | |
838 | |
839 { | |
840 IsGCActiveMark x; | |
841 | |
842 // Timing | |
843 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); | |
844 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
845 TraceTime t(full ? "Full GC (System.gc())" : "Full GC", PrintGC, true, gclog_or_tty); | |
846 | |
847 double start = os::elapsedTime(); | |
848 GCOverheadReporter::recordSTWStart(start); | |
849 g1_policy()->record_full_collection_start(); | |
850 | |
851 gc_prologue(true); | |
852 increment_total_collections(); | |
853 | |
854 size_t g1h_prev_used = used(); | |
855 assert(used() == recalculate_used(), "Should be equal"); | |
856 | |
857 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
858 HandleMark hm; // Discard invalid handles created during verification | |
859 prepare_for_verify(); | |
860 gclog_or_tty->print(" VerifyBeforeGC:"); | |
861 Universe::verify(true); | |
862 } | |
863 assert(regions_accounted_for(), "Region leakage!"); | |
864 | |
865 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
866 | |
867 // We want to discover references, but not process them yet. | |
868 // This mode is disabled in | |
869 // instanceRefKlass::process_discovered_references if the | |
870 // generation does some collection work, or | |
871 // instanceRefKlass::enqueue_discovered_references if the | |
872 // generation returns without doing any work. | |
873 ref_processor()->disable_discovery(); | |
874 ref_processor()->abandon_partial_discovery(); | |
875 ref_processor()->verify_no_references_recorded(); | |
876 | |
877 // Abandon current iterations of concurrent marking and concurrent | |
878 // refinement, if any are in progress. | |
879 concurrent_mark()->abort(); | |
880 | |
881 // Make sure we'll choose a new allocation region afterwards. | |
882 abandon_cur_alloc_region(); | |
883 assert(_cur_alloc_region == NULL, "Invariant."); | |
884 g1_rem_set()->as_HRInto_G1RemSet()->cleanupHRRS(); | |
885 tear_down_region_lists(); | |
886 set_used_regions_to_need_zero_fill(); | |
887 if (g1_policy()->in_young_gc_mode()) { | |
888 empty_young_list(); | |
889 g1_policy()->set_full_young_gcs(true); | |
890 } | |
891 | |
892 // Temporarily make reference _discovery_ single threaded (non-MT). | |
893 ReferenceProcessorMTMutator rp_disc_ser(ref_processor(), false); | |
894 | |
895 // Temporarily make refs discovery atomic | |
896 ReferenceProcessorAtomicMutator rp_disc_atomic(ref_processor(), true); | |
897 | |
898 // Temporarily clear _is_alive_non_header | |
899 ReferenceProcessorIsAliveMutator rp_is_alive_null(ref_processor(), NULL); | |
900 | |
901 ref_processor()->enable_discovery(); | |
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902 ref_processor()->setup_policy(clear_all_soft_refs); |
342 | 903 |
904 // Do collection work | |
905 { | |
906 HandleMark hm; // Discard invalid handles created during gc | |
907 G1MarkSweep::invoke_at_safepoint(ref_processor(), clear_all_soft_refs); | |
908 } | |
909 // Because freeing humongous regions may have added some unclean | |
910 // regions, it is necessary to tear down again before rebuilding. | |
911 tear_down_region_lists(); | |
912 rebuild_region_lists(); | |
913 | |
914 _summary_bytes_used = recalculate_used(); | |
915 | |
916 ref_processor()->enqueue_discovered_references(); | |
917 | |
918 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
919 | |
920 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { | |
921 HandleMark hm; // Discard invalid handles created during verification | |
922 gclog_or_tty->print(" VerifyAfterGC:"); | |
923 Universe::verify(false); | |
924 } | |
925 NOT_PRODUCT(ref_processor()->verify_no_references_recorded()); | |
926 | |
927 reset_gc_time_stamp(); | |
928 // Since everything potentially moved, we will clear all remembered | |
929 // sets, and clear all cards. Later we will also cards in the used | |
930 // portion of the heap after the resizing (which could be a shrinking.) | |
931 // We will also reset the GC time stamps of the regions. | |
932 PostMCRemSetClearClosure rs_clear(mr_bs()); | |
933 heap_region_iterate(&rs_clear); | |
934 | |
935 // Resize the heap if necessary. | |
936 resize_if_necessary_after_full_collection(full ? 0 : word_size); | |
937 | |
938 // Since everything potentially moved, we will clear all remembered | |
939 // sets, but also dirty all cards corresponding to used regions. | |
940 PostMCRemSetInvalidateClosure rs_invalidate(mr_bs()); | |
941 heap_region_iterate(&rs_invalidate); | |
942 if (_cg1r->use_cache()) { | |
943 _cg1r->clear_and_record_card_counts(); | |
944 _cg1r->clear_hot_cache(); | |
945 } | |
946 | |
947 if (PrintGC) { | |
948 print_size_transition(gclog_or_tty, g1h_prev_used, used(), capacity()); | |
949 } | |
950 | |
951 if (true) { // FIXME | |
952 // Ask the permanent generation to adjust size for full collections | |
953 perm()->compute_new_size(); | |
954 } | |
955 | |
956 double end = os::elapsedTime(); | |
957 GCOverheadReporter::recordSTWEnd(end); | |
958 g1_policy()->record_full_collection_end(); | |
959 | |
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960 #ifdef TRACESPINNING |
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961 ParallelTaskTerminator::print_termination_counts(); |
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962 #endif |
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963 |
342 | 964 gc_epilogue(true); |
965 | |
966 // Abandon concurrent refinement. This must happen last: in the | |
967 // dirty-card logging system, some cards may be dirty by weak-ref | |
968 // processing, and may be enqueued. But the whole card table is | |
969 // dirtied, so this should abandon those logs, and set "do_traversal" | |
970 // to true. | |
971 concurrent_g1_refine()->set_pya_restart(); | |
616
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972 assert(!G1DeferredRSUpdate |
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973 || (G1DeferredRSUpdate && (dirty_card_queue_set().completed_buffers_num() == 0)), "Should not be any"); |
342 | 974 assert(regions_accounted_for(), "Region leakage!"); |
975 } | |
976 | |
977 if (g1_policy()->in_young_gc_mode()) { | |
978 _young_list->reset_sampled_info(); | |
979 assert( check_young_list_empty(false, false), | |
980 "young list should be empty at this point"); | |
981 } | |
982 } | |
983 | |
984 void G1CollectedHeap::do_full_collection(bool clear_all_soft_refs) { | |
985 do_collection(true, clear_all_soft_refs, 0); | |
986 } | |
987 | |
988 // This code is mostly copied from TenuredGeneration. | |
989 void | |
990 G1CollectedHeap:: | |
991 resize_if_necessary_after_full_collection(size_t word_size) { | |
992 assert(MinHeapFreeRatio <= MaxHeapFreeRatio, "sanity check"); | |
993 | |
994 // Include the current allocation, if any, and bytes that will be | |
995 // pre-allocated to support collections, as "used". | |
996 const size_t used_after_gc = used(); | |
997 const size_t capacity_after_gc = capacity(); | |
998 const size_t free_after_gc = capacity_after_gc - used_after_gc; | |
999 | |
1000 // We don't have floating point command-line arguments | |
1001 const double minimum_free_percentage = (double) MinHeapFreeRatio / 100; | |
1002 const double maximum_used_percentage = 1.0 - minimum_free_percentage; | |
1003 const double maximum_free_percentage = (double) MaxHeapFreeRatio / 100; | |
1004 const double minimum_used_percentage = 1.0 - maximum_free_percentage; | |
1005 | |
1006 size_t minimum_desired_capacity = (size_t) (used_after_gc / maximum_used_percentage); | |
1007 size_t maximum_desired_capacity = (size_t) (used_after_gc / minimum_used_percentage); | |
1008 | |
1009 // Don't shrink less than the initial size. | |
1010 minimum_desired_capacity = | |
1011 MAX2(minimum_desired_capacity, | |
1012 collector_policy()->initial_heap_byte_size()); | |
1013 maximum_desired_capacity = | |
1014 MAX2(maximum_desired_capacity, | |
1015 collector_policy()->initial_heap_byte_size()); | |
1016 | |
1017 // We are failing here because minimum_desired_capacity is | |
1018 assert(used_after_gc <= minimum_desired_capacity, "sanity check"); | |
1019 assert(minimum_desired_capacity <= maximum_desired_capacity, "sanity check"); | |
1020 | |
1021 if (PrintGC && Verbose) { | |
1022 const double free_percentage = ((double)free_after_gc) / capacity(); | |
1023 gclog_or_tty->print_cr("Computing new size after full GC "); | |
1024 gclog_or_tty->print_cr(" " | |
1025 " minimum_free_percentage: %6.2f", | |
1026 minimum_free_percentage); | |
1027 gclog_or_tty->print_cr(" " | |
1028 " maximum_free_percentage: %6.2f", | |
1029 maximum_free_percentage); | |
1030 gclog_or_tty->print_cr(" " | |
1031 " capacity: %6.1fK" | |
1032 " minimum_desired_capacity: %6.1fK" | |
1033 " maximum_desired_capacity: %6.1fK", | |
1034 capacity() / (double) K, | |
1035 minimum_desired_capacity / (double) K, | |
1036 maximum_desired_capacity / (double) K); | |
1037 gclog_or_tty->print_cr(" " | |
1038 " free_after_gc : %6.1fK" | |
1039 " used_after_gc : %6.1fK", | |
1040 free_after_gc / (double) K, | |
1041 used_after_gc / (double) K); | |
1042 gclog_or_tty->print_cr(" " | |
1043 " free_percentage: %6.2f", | |
1044 free_percentage); | |
1045 } | |
1046 if (capacity() < minimum_desired_capacity) { | |
1047 // Don't expand unless it's significant | |
1048 size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; | |
1049 expand(expand_bytes); | |
1050 if (PrintGC && Verbose) { | |
1051 gclog_or_tty->print_cr(" expanding:" | |
1052 " minimum_desired_capacity: %6.1fK" | |
1053 " expand_bytes: %6.1fK", | |
1054 minimum_desired_capacity / (double) K, | |
1055 expand_bytes / (double) K); | |
1056 } | |
1057 | |
1058 // No expansion, now see if we want to shrink | |
1059 } else if (capacity() > maximum_desired_capacity) { | |
1060 // Capacity too large, compute shrinking size | |
1061 size_t shrink_bytes = capacity_after_gc - maximum_desired_capacity; | |
1062 shrink(shrink_bytes); | |
1063 if (PrintGC && Verbose) { | |
1064 gclog_or_tty->print_cr(" " | |
1065 " shrinking:" | |
1066 " initSize: %.1fK" | |
1067 " maximum_desired_capacity: %.1fK", | |
1068 collector_policy()->initial_heap_byte_size() / (double) K, | |
1069 maximum_desired_capacity / (double) K); | |
1070 gclog_or_tty->print_cr(" " | |
1071 " shrink_bytes: %.1fK", | |
1072 shrink_bytes / (double) K); | |
1073 } | |
1074 } | |
1075 } | |
1076 | |
1077 | |
1078 HeapWord* | |
1079 G1CollectedHeap::satisfy_failed_allocation(size_t word_size) { | |
1080 HeapWord* result = NULL; | |
1081 | |
1082 // In a G1 heap, we're supposed to keep allocation from failing by | |
1083 // incremental pauses. Therefore, at least for now, we'll favor | |
1084 // expansion over collection. (This might change in the future if we can | |
1085 // do something smarter than full collection to satisfy a failed alloc.) | |
1086 | |
1087 result = expand_and_allocate(word_size); | |
1088 if (result != NULL) { | |
1089 assert(is_in(result), "result not in heap"); | |
1090 return result; | |
1091 } | |
1092 | |
1093 // OK, I guess we have to try collection. | |
1094 | |
1095 do_collection(false, false, word_size); | |
1096 | |
1097 result = attempt_allocation(word_size, /*permit_collection_pause*/false); | |
1098 | |
1099 if (result != NULL) { | |
1100 assert(is_in(result), "result not in heap"); | |
1101 return result; | |
1102 } | |
1103 | |
1104 // Try collecting soft references. | |
1105 do_collection(false, true, word_size); | |
1106 result = attempt_allocation(word_size, /*permit_collection_pause*/false); | |
1107 if (result != NULL) { | |
1108 assert(is_in(result), "result not in heap"); | |
1109 return result; | |
1110 } | |
1111 | |
1112 // What else? We might try synchronous finalization later. If the total | |
1113 // space available is large enough for the allocation, then a more | |
1114 // complete compaction phase than we've tried so far might be | |
1115 // appropriate. | |
1116 return NULL; | |
1117 } | |
1118 | |
1119 // Attempting to expand the heap sufficiently | |
1120 // to support an allocation of the given "word_size". If | |
1121 // successful, perform the allocation and return the address of the | |
1122 // allocated block, or else "NULL". | |
1123 | |
1124 HeapWord* G1CollectedHeap::expand_and_allocate(size_t word_size) { | |
1125 size_t expand_bytes = word_size * HeapWordSize; | |
1126 if (expand_bytes < MinHeapDeltaBytes) { | |
1127 expand_bytes = MinHeapDeltaBytes; | |
1128 } | |
1129 expand(expand_bytes); | |
1130 assert(regions_accounted_for(), "Region leakage!"); | |
1131 HeapWord* result = attempt_allocation(word_size, false /* permit_collection_pause */); | |
1132 return result; | |
1133 } | |
1134 | |
1135 size_t G1CollectedHeap::free_region_if_totally_empty(HeapRegion* hr) { | |
1136 size_t pre_used = 0; | |
1137 size_t cleared_h_regions = 0; | |
1138 size_t freed_regions = 0; | |
1139 UncleanRegionList local_list; | |
1140 free_region_if_totally_empty_work(hr, pre_used, cleared_h_regions, | |
1141 freed_regions, &local_list); | |
1142 | |
1143 finish_free_region_work(pre_used, cleared_h_regions, freed_regions, | |
1144 &local_list); | |
1145 return pre_used; | |
1146 } | |
1147 | |
1148 void | |
1149 G1CollectedHeap::free_region_if_totally_empty_work(HeapRegion* hr, | |
1150 size_t& pre_used, | |
1151 size_t& cleared_h, | |
1152 size_t& freed_regions, | |
1153 UncleanRegionList* list, | |
1154 bool par) { | |
1155 assert(!hr->continuesHumongous(), "should have filtered these out"); | |
1156 size_t res = 0; | |
1157 if (!hr->popular() && hr->used() > 0 && hr->garbage_bytes() == hr->used()) { | |
1158 if (!hr->is_young()) { | |
1159 if (G1PolicyVerbose > 0) | |
1160 gclog_or_tty->print_cr("Freeing empty region "PTR_FORMAT "(" SIZE_FORMAT " bytes)" | |
1161 " during cleanup", hr, hr->used()); | |
1162 free_region_work(hr, pre_used, cleared_h, freed_regions, list, par); | |
1163 } | |
1164 } | |
1165 } | |
1166 | |
1167 // FIXME: both this and shrink could probably be more efficient by | |
1168 // doing one "VirtualSpace::expand_by" call rather than several. | |
1169 void G1CollectedHeap::expand(size_t expand_bytes) { | |
1170 size_t old_mem_size = _g1_storage.committed_size(); | |
1171 // We expand by a minimum of 1K. | |
1172 expand_bytes = MAX2(expand_bytes, (size_t)K); | |
1173 size_t aligned_expand_bytes = | |
1174 ReservedSpace::page_align_size_up(expand_bytes); | |
1175 aligned_expand_bytes = align_size_up(aligned_expand_bytes, | |
1176 HeapRegion::GrainBytes); | |
1177 expand_bytes = aligned_expand_bytes; | |
1178 while (expand_bytes > 0) { | |
1179 HeapWord* base = (HeapWord*)_g1_storage.high(); | |
1180 // Commit more storage. | |
1181 bool successful = _g1_storage.expand_by(HeapRegion::GrainBytes); | |
1182 if (!successful) { | |
1183 expand_bytes = 0; | |
1184 } else { | |
1185 expand_bytes -= HeapRegion::GrainBytes; | |
1186 // Expand the committed region. | |
1187 HeapWord* high = (HeapWord*) _g1_storage.high(); | |
1188 _g1_committed.set_end(high); | |
1189 // Create a new HeapRegion. | |
1190 MemRegion mr(base, high); | |
1191 bool is_zeroed = !_g1_max_committed.contains(base); | |
1192 HeapRegion* hr = new HeapRegion(_bot_shared, mr, is_zeroed); | |
1193 | |
1194 // Now update max_committed if necessary. | |
1195 _g1_max_committed.set_end(MAX2(_g1_max_committed.end(), high)); | |
1196 | |
1197 // Add it to the HeapRegionSeq. | |
1198 _hrs->insert(hr); | |
1199 // Set the zero-fill state, according to whether it's already | |
1200 // zeroed. | |
1201 { | |
1202 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
1203 if (is_zeroed) { | |
1204 hr->set_zero_fill_complete(); | |
1205 put_free_region_on_list_locked(hr); | |
1206 } else { | |
1207 hr->set_zero_fill_needed(); | |
1208 put_region_on_unclean_list_locked(hr); | |
1209 } | |
1210 } | |
1211 _free_regions++; | |
1212 // And we used up an expansion region to create it. | |
1213 _expansion_regions--; | |
1214 // Tell the cardtable about it. | |
1215 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
1216 // And the offset table as well. | |
1217 _bot_shared->resize(_g1_committed.word_size()); | |
1218 } | |
1219 } | |
1220 if (Verbose && PrintGC) { | |
1221 size_t new_mem_size = _g1_storage.committed_size(); | |
1222 gclog_or_tty->print_cr("Expanding garbage-first heap from %ldK by %ldK to %ldK", | |
1223 old_mem_size/K, aligned_expand_bytes/K, | |
1224 new_mem_size/K); | |
1225 } | |
1226 } | |
1227 | |
1228 void G1CollectedHeap::shrink_helper(size_t shrink_bytes) | |
1229 { | |
1230 size_t old_mem_size = _g1_storage.committed_size(); | |
1231 size_t aligned_shrink_bytes = | |
1232 ReservedSpace::page_align_size_down(shrink_bytes); | |
1233 aligned_shrink_bytes = align_size_down(aligned_shrink_bytes, | |
1234 HeapRegion::GrainBytes); | |
1235 size_t num_regions_deleted = 0; | |
1236 MemRegion mr = _hrs->shrink_by(aligned_shrink_bytes, num_regions_deleted); | |
1237 | |
1238 assert(mr.end() == (HeapWord*)_g1_storage.high(), "Bad shrink!"); | |
1239 if (mr.byte_size() > 0) | |
1240 _g1_storage.shrink_by(mr.byte_size()); | |
1241 assert(mr.start() == (HeapWord*)_g1_storage.high(), "Bad shrink!"); | |
1242 | |
1243 _g1_committed.set_end(mr.start()); | |
1244 _free_regions -= num_regions_deleted; | |
1245 _expansion_regions += num_regions_deleted; | |
1246 | |
1247 // Tell the cardtable about it. | |
1248 Universe::heap()->barrier_set()->resize_covered_region(_g1_committed); | |
1249 | |
1250 // And the offset table as well. | |
1251 _bot_shared->resize(_g1_committed.word_size()); | |
1252 | |
1253 HeapRegionRemSet::shrink_heap(n_regions()); | |
1254 | |
1255 if (Verbose && PrintGC) { | |
1256 size_t new_mem_size = _g1_storage.committed_size(); | |
1257 gclog_or_tty->print_cr("Shrinking garbage-first heap from %ldK by %ldK to %ldK", | |
1258 old_mem_size/K, aligned_shrink_bytes/K, | |
1259 new_mem_size/K); | |
1260 } | |
1261 } | |
1262 | |
1263 void G1CollectedHeap::shrink(size_t shrink_bytes) { | |
1264 release_gc_alloc_regions(); | |
1265 tear_down_region_lists(); // We will rebuild them in a moment. | |
1266 shrink_helper(shrink_bytes); | |
1267 rebuild_region_lists(); | |
1268 } | |
1269 | |
1270 // Public methods. | |
1271 | |
1272 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
1273 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
1274 #endif // _MSC_VER | |
1275 | |
1276 | |
1277 G1CollectedHeap::G1CollectedHeap(G1CollectorPolicy* policy_) : | |
1278 SharedHeap(policy_), | |
1279 _g1_policy(policy_), | |
1280 _ref_processor(NULL), | |
1281 _process_strong_tasks(new SubTasksDone(G1H_PS_NumElements)), | |
1282 _bot_shared(NULL), | |
1283 _par_alloc_during_gc_lock(Mutex::leaf, "par alloc during GC lock"), | |
1284 _objs_with_preserved_marks(NULL), _preserved_marks_of_objs(NULL), | |
1285 _evac_failure_scan_stack(NULL) , | |
1286 _mark_in_progress(false), | |
1287 _cg1r(NULL), _czft(NULL), _summary_bytes_used(0), | |
1288 _cur_alloc_region(NULL), | |
1289 _refine_cte_cl(NULL), | |
1290 _free_region_list(NULL), _free_region_list_size(0), | |
1291 _free_regions(0), | |
1292 _popular_object_boundary(NULL), | |
1293 _cur_pop_hr_index(0), | |
1294 _popular_regions_to_be_evacuated(NULL), | |
1295 _pop_obj_rc_at_copy(), | |
1296 _full_collection(false), | |
1297 _unclean_region_list(), | |
1298 _unclean_regions_coming(false), | |
1299 _young_list(new YoungList(this)), | |
1300 _gc_time_stamp(0), | |
526 | 1301 _surviving_young_words(NULL), |
1302 _in_cset_fast_test(NULL), | |
1303 _in_cset_fast_test_base(NULL) | |
342 | 1304 { |
1305 _g1h = this; // To catch bugs. | |
1306 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
1307 vm_exit_during_initialization("Failed necessary allocation."); | |
1308 } | |
1309 int n_queues = MAX2((int)ParallelGCThreads, 1); | |
1310 _task_queues = new RefToScanQueueSet(n_queues); | |
1311 | |
1312 int n_rem_sets = HeapRegionRemSet::num_par_rem_sets(); | |
1313 assert(n_rem_sets > 0, "Invariant."); | |
1314 | |
1315 HeapRegionRemSetIterator** iter_arr = | |
1316 NEW_C_HEAP_ARRAY(HeapRegionRemSetIterator*, n_queues); | |
1317 for (int i = 0; i < n_queues; i++) { | |
1318 iter_arr[i] = new HeapRegionRemSetIterator(); | |
1319 } | |
1320 _rem_set_iterator = iter_arr; | |
1321 | |
1322 for (int i = 0; i < n_queues; i++) { | |
1323 RefToScanQueue* q = new RefToScanQueue(); | |
1324 q->initialize(); | |
1325 _task_queues->register_queue(i, q); | |
1326 } | |
1327 | |
1328 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
1329 _gc_alloc_regions[ap] = NULL; | |
1330 _gc_alloc_region_counts[ap] = 0; | |
1331 } | |
1332 guarantee(_task_queues != NULL, "task_queues allocation failure."); | |
1333 } | |
1334 | |
1335 jint G1CollectedHeap::initialize() { | |
1336 os::enable_vtime(); | |
1337 | |
1338 // Necessary to satisfy locking discipline assertions. | |
1339 | |
1340 MutexLocker x(Heap_lock); | |
1341 | |
1342 // While there are no constraints in the GC code that HeapWordSize | |
1343 // be any particular value, there are multiple other areas in the | |
1344 // system which believe this to be true (e.g. oop->object_size in some | |
1345 // cases incorrectly returns the size in wordSize units rather than | |
1346 // HeapWordSize). | |
1347 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
1348 | |
1349 size_t init_byte_size = collector_policy()->initial_heap_byte_size(); | |
1350 size_t max_byte_size = collector_policy()->max_heap_byte_size(); | |
1351 | |
1352 // Ensure that the sizes are properly aligned. | |
1353 Universe::check_alignment(init_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
1354 Universe::check_alignment(max_byte_size, HeapRegion::GrainBytes, "g1 heap"); | |
1355 | |
1356 // We allocate this in any case, but only do no work if the command line | |
1357 // param is off. | |
1358 _cg1r = new ConcurrentG1Refine(); | |
1359 | |
1360 // Reserve the maximum. | |
1361 PermanentGenerationSpec* pgs = collector_policy()->permanent_generation(); | |
1362 // Includes the perm-gen. | |
642
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1363 |
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1364 const size_t total_reserved = max_byte_size + pgs->max_size(); |
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1365 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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1366 |
342 | 1367 ReservedSpace heap_rs(max_byte_size + pgs->max_size(), |
1368 HeapRegion::GrainBytes, | |
642
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1369 false /*ism*/, addr); |
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1370 |
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1371 if (UseCompressedOops) { |
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1372 if (addr != NULL && !heap_rs.is_reserved()) { |
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1373 // Failed to reserve at specified address - the requested memory |
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1374 // region is taken already, for example, by 'java' launcher. |
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1375 // Try again to reserver heap higher. |
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1376 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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1377 ReservedSpace heap_rs0(total_reserved, HeapRegion::GrainBytes, |
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1378 false /*ism*/, addr); |
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1379 if (addr != NULL && !heap_rs0.is_reserved()) { |
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1380 // Failed to reserve at specified address again - give up. |
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1381 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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1382 assert(addr == NULL, ""); |
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1383 ReservedSpace heap_rs1(total_reserved, HeapRegion::GrainBytes, |
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1384 false /*ism*/, addr); |
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1385 heap_rs = heap_rs1; |
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1386 } else { |
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1387 heap_rs = heap_rs0; |
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1388 } |
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1389 } |
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1390 } |
342 | 1391 |
1392 if (!heap_rs.is_reserved()) { | |
1393 vm_exit_during_initialization("Could not reserve enough space for object heap"); | |
1394 return JNI_ENOMEM; | |
1395 } | |
1396 | |
1397 // It is important to do this in a way such that concurrent readers can't | |
1398 // temporarily think somethings in the heap. (I've actually seen this | |
1399 // happen in asserts: DLD.) | |
1400 _reserved.set_word_size(0); | |
1401 _reserved.set_start((HeapWord*)heap_rs.base()); | |
1402 _reserved.set_end((HeapWord*)(heap_rs.base() + heap_rs.size())); | |
1403 | |
1404 _expansion_regions = max_byte_size/HeapRegion::GrainBytes; | |
1405 | |
1406 _num_humongous_regions = 0; | |
1407 | |
1408 // Create the gen rem set (and barrier set) for the entire reserved region. | |
1409 _rem_set = collector_policy()->create_rem_set(_reserved, 2); | |
1410 set_barrier_set(rem_set()->bs()); | |
1411 if (barrier_set()->is_a(BarrierSet::ModRef)) { | |
1412 _mr_bs = (ModRefBarrierSet*)_barrier_set; | |
1413 } else { | |
1414 vm_exit_during_initialization("G1 requires a mod ref bs."); | |
1415 return JNI_ENOMEM; | |
1416 } | |
1417 | |
1418 // Also create a G1 rem set. | |
1419 if (G1UseHRIntoRS) { | |
1420 if (mr_bs()->is_a(BarrierSet::CardTableModRef)) { | |
1421 _g1_rem_set = new HRInto_G1RemSet(this, (CardTableModRefBS*)mr_bs()); | |
1422 } else { | |
1423 vm_exit_during_initialization("G1 requires a cardtable mod ref bs."); | |
1424 return JNI_ENOMEM; | |
1425 } | |
1426 } else { | |
1427 _g1_rem_set = new StupidG1RemSet(this); | |
1428 } | |
1429 | |
1430 // Carve out the G1 part of the heap. | |
1431 | |
1432 ReservedSpace g1_rs = heap_rs.first_part(max_byte_size); | |
1433 _g1_reserved = MemRegion((HeapWord*)g1_rs.base(), | |
1434 g1_rs.size()/HeapWordSize); | |
1435 ReservedSpace perm_gen_rs = heap_rs.last_part(max_byte_size); | |
1436 | |
1437 _perm_gen = pgs->init(perm_gen_rs, pgs->init_size(), rem_set()); | |
1438 | |
1439 _g1_storage.initialize(g1_rs, 0); | |
1440 _g1_committed = MemRegion((HeapWord*)_g1_storage.low(), (size_t) 0); | |
1441 _g1_max_committed = _g1_committed; | |
393 | 1442 _hrs = new HeapRegionSeq(_expansion_regions); |
342 | 1443 guarantee(_hrs != NULL, "Couldn't allocate HeapRegionSeq"); |
1444 guarantee(_cur_alloc_region == NULL, "from constructor"); | |
1445 | |
1446 _bot_shared = new G1BlockOffsetSharedArray(_reserved, | |
1447 heap_word_size(init_byte_size)); | |
1448 | |
1449 _g1h = this; | |
1450 | |
1451 // Create the ConcurrentMark data structure and thread. | |
1452 // (Must do this late, so that "max_regions" is defined.) | |
1453 _cm = new ConcurrentMark(heap_rs, (int) max_regions()); | |
1454 _cmThread = _cm->cmThread(); | |
1455 | |
1456 // ...and the concurrent zero-fill thread, if necessary. | |
1457 if (G1ConcZeroFill) { | |
1458 _czft = new ConcurrentZFThread(); | |
1459 } | |
1460 | |
1461 | |
1462 | |
1463 // Allocate the popular regions; take them off free lists. | |
1464 size_t pop_byte_size = G1NumPopularRegions * HeapRegion::GrainBytes; | |
1465 expand(pop_byte_size); | |
1466 _popular_object_boundary = | |
1467 _g1_reserved.start() + (G1NumPopularRegions * HeapRegion::GrainWords); | |
1468 for (int i = 0; i < G1NumPopularRegions; i++) { | |
1469 HeapRegion* hr = newAllocRegion(HeapRegion::GrainWords); | |
1470 // assert(hr != NULL && hr->bottom() < _popular_object_boundary, | |
1471 // "Should be enough, and all should be below boundary."); | |
1472 hr->set_popular(true); | |
1473 } | |
1474 assert(_cur_pop_hr_index == 0, "Start allocating at the first region."); | |
1475 | |
1476 // Initialize the from_card cache structure of HeapRegionRemSet. | |
1477 HeapRegionRemSet::init_heap(max_regions()); | |
1478 | |
1479 // Now expand into the rest of the initial heap size. | |
1480 expand(init_byte_size - pop_byte_size); | |
1481 | |
1482 // Perform any initialization actions delegated to the policy. | |
1483 g1_policy()->init(); | |
1484 | |
1485 g1_policy()->note_start_of_mark_thread(); | |
1486 | |
1487 _refine_cte_cl = | |
1488 new RefineCardTableEntryClosure(ConcurrentG1RefineThread::sts(), | |
1489 g1_rem_set(), | |
1490 concurrent_g1_refine()); | |
1491 JavaThread::dirty_card_queue_set().set_closure(_refine_cte_cl); | |
1492 | |
1493 JavaThread::satb_mark_queue_set().initialize(SATB_Q_CBL_mon, | |
1494 SATB_Q_FL_lock, | |
1495 0, | |
1496 Shared_SATB_Q_lock); | |
1497 if (G1RSBarrierUseQueue) { | |
1498 JavaThread::dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, | |
1499 DirtyCardQ_FL_lock, | |
1500 G1DirtyCardQueueMax, | |
1501 Shared_DirtyCardQ_lock); | |
1502 } | |
616
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1503 if (G1DeferredRSUpdate) { |
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1504 dirty_card_queue_set().initialize(DirtyCardQ_CBL_mon, |
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1505 DirtyCardQ_FL_lock, |
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1506 0, |
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1507 Shared_DirtyCardQ_lock, |
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1508 &JavaThread::dirty_card_queue_set()); |
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1509 } |
342 | 1510 // In case we're keeping closure specialization stats, initialize those |
1511 // counts and that mechanism. | |
1512 SpecializationStats::clear(); | |
1513 | |
1514 _gc_alloc_region_list = NULL; | |
1515 | |
1516 // Do later initialization work for concurrent refinement. | |
1517 _cg1r->init(); | |
1518 | |
1519 const char* group_names[] = { "CR", "ZF", "CM", "CL" }; | |
1520 GCOverheadReporter::initGCOverheadReporter(4, group_names); | |
1521 | |
1522 return JNI_OK; | |
1523 } | |
1524 | |
1525 void G1CollectedHeap::ref_processing_init() { | |
1526 SharedHeap::ref_processing_init(); | |
1527 MemRegion mr = reserved_region(); | |
1528 _ref_processor = ReferenceProcessor::create_ref_processor( | |
1529 mr, // span | |
1530 false, // Reference discovery is not atomic | |
1531 // (though it shouldn't matter here.) | |
1532 true, // mt_discovery | |
1533 NULL, // is alive closure: need to fill this in for efficiency | |
1534 ParallelGCThreads, | |
1535 ParallelRefProcEnabled, | |
1536 true); // Setting next fields of discovered | |
1537 // lists requires a barrier. | |
1538 } | |
1539 | |
1540 size_t G1CollectedHeap::capacity() const { | |
1541 return _g1_committed.byte_size(); | |
1542 } | |
1543 | |
1544 void G1CollectedHeap::iterate_dirty_card_closure(bool concurrent, | |
1545 int worker_i) { | |
1546 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
1547 int n_completed_buffers = 0; | |
1548 while (dcqs.apply_closure_to_completed_buffer(worker_i, 0, true)) { | |
1549 n_completed_buffers++; | |
1550 } | |
1551 g1_policy()->record_update_rs_processed_buffers(worker_i, | |
1552 (double) n_completed_buffers); | |
1553 dcqs.clear_n_completed_buffers(); | |
1554 // Finish up the queue... | |
1555 if (worker_i == 0) concurrent_g1_refine()->clean_up_cache(worker_i, | |
1556 g1_rem_set()); | |
1557 assert(!dcqs.completed_buffers_exist_dirty(), "Completed buffers exist!"); | |
1558 } | |
1559 | |
1560 | |
1561 // Computes the sum of the storage used by the various regions. | |
1562 | |
1563 size_t G1CollectedHeap::used() const { | |
1564 assert(Heap_lock->owner() != NULL, | |
1565 "Should be owned on this thread's behalf."); | |
1566 size_t result = _summary_bytes_used; | |
1567 if (_cur_alloc_region != NULL) | |
1568 result += _cur_alloc_region->used(); | |
1569 return result; | |
1570 } | |
1571 | |
1572 class SumUsedClosure: public HeapRegionClosure { | |
1573 size_t _used; | |
1574 public: | |
1575 SumUsedClosure() : _used(0) {} | |
1576 bool doHeapRegion(HeapRegion* r) { | |
1577 if (!r->continuesHumongous()) { | |
1578 _used += r->used(); | |
1579 } | |
1580 return false; | |
1581 } | |
1582 size_t result() { return _used; } | |
1583 }; | |
1584 | |
1585 size_t G1CollectedHeap::recalculate_used() const { | |
1586 SumUsedClosure blk; | |
1587 _hrs->iterate(&blk); | |
1588 return blk.result(); | |
1589 } | |
1590 | |
1591 #ifndef PRODUCT | |
1592 class SumUsedRegionsClosure: public HeapRegionClosure { | |
1593 size_t _num; | |
1594 public: | |
1595 // _num is set to 1 to account for the popular region | |
1596 SumUsedRegionsClosure() : _num(G1NumPopularRegions) {} | |
1597 bool doHeapRegion(HeapRegion* r) { | |
1598 if (r->continuesHumongous() || r->used() > 0 || r->is_gc_alloc_region()) { | |
1599 _num += 1; | |
1600 } | |
1601 return false; | |
1602 } | |
1603 size_t result() { return _num; } | |
1604 }; | |
1605 | |
1606 size_t G1CollectedHeap::recalculate_used_regions() const { | |
1607 SumUsedRegionsClosure blk; | |
1608 _hrs->iterate(&blk); | |
1609 return blk.result(); | |
1610 } | |
1611 #endif // PRODUCT | |
1612 | |
1613 size_t G1CollectedHeap::unsafe_max_alloc() { | |
1614 if (_free_regions > 0) return HeapRegion::GrainBytes; | |
1615 // otherwise, is there space in the current allocation region? | |
1616 | |
1617 // We need to store the current allocation region in a local variable | |
1618 // here. The problem is that this method doesn't take any locks and | |
1619 // there may be other threads which overwrite the current allocation | |
1620 // region field. attempt_allocation(), for example, sets it to NULL | |
1621 // and this can happen *after* the NULL check here but before the call | |
1622 // to free(), resulting in a SIGSEGV. Note that this doesn't appear | |
1623 // to be a problem in the optimized build, since the two loads of the | |
1624 // current allocation region field are optimized away. | |
1625 HeapRegion* car = _cur_alloc_region; | |
1626 | |
1627 // FIXME: should iterate over all regions? | |
1628 if (car == NULL) { | |
1629 return 0; | |
1630 } | |
1631 return car->free(); | |
1632 } | |
1633 | |
1634 void G1CollectedHeap::collect(GCCause::Cause cause) { | |
1635 // The caller doesn't have the Heap_lock | |
1636 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
1637 MutexLocker ml(Heap_lock); | |
1638 collect_locked(cause); | |
1639 } | |
1640 | |
1641 void G1CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { | |
1642 assert(Thread::current()->is_VM_thread(), "Precondition#1"); | |
1643 assert(Heap_lock->is_locked(), "Precondition#2"); | |
1644 GCCauseSetter gcs(this, cause); | |
1645 switch (cause) { | |
1646 case GCCause::_heap_inspection: | |
1647 case GCCause::_heap_dump: { | |
1648 HandleMark hm; | |
1649 do_full_collection(false); // don't clear all soft refs | |
1650 break; | |
1651 } | |
1652 default: // XXX FIX ME | |
1653 ShouldNotReachHere(); // Unexpected use of this function | |
1654 } | |
1655 } | |
1656 | |
1657 | |
1658 void G1CollectedHeap::collect_locked(GCCause::Cause cause) { | |
1659 // Don't want to do a GC until cleanup is completed. | |
1660 wait_for_cleanup_complete(); | |
1661 | |
1662 // Read the GC count while holding the Heap_lock | |
1663 int gc_count_before = SharedHeap::heap()->total_collections(); | |
1664 { | |
1665 MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back | |
1666 VM_G1CollectFull op(gc_count_before, cause); | |
1667 VMThread::execute(&op); | |
1668 } | |
1669 } | |
1670 | |
1671 bool G1CollectedHeap::is_in(const void* p) const { | |
1672 if (_g1_committed.contains(p)) { | |
1673 HeapRegion* hr = _hrs->addr_to_region(p); | |
1674 return hr->is_in(p); | |
1675 } else { | |
1676 return _perm_gen->as_gen()->is_in(p); | |
1677 } | |
1678 } | |
1679 | |
1680 // Iteration functions. | |
1681 | |
1682 // Iterates an OopClosure over all ref-containing fields of objects | |
1683 // within a HeapRegion. | |
1684 | |
1685 class IterateOopClosureRegionClosure: public HeapRegionClosure { | |
1686 MemRegion _mr; | |
1687 OopClosure* _cl; | |
1688 public: | |
1689 IterateOopClosureRegionClosure(MemRegion mr, OopClosure* cl) | |
1690 : _mr(mr), _cl(cl) {} | |
1691 bool doHeapRegion(HeapRegion* r) { | |
1692 if (! r->continuesHumongous()) { | |
1693 r->oop_iterate(_cl); | |
1694 } | |
1695 return false; | |
1696 } | |
1697 }; | |
1698 | |
1699 void G1CollectedHeap::oop_iterate(OopClosure* cl) { | |
1700 IterateOopClosureRegionClosure blk(_g1_committed, cl); | |
1701 _hrs->iterate(&blk); | |
1702 } | |
1703 | |
1704 void G1CollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl) { | |
1705 IterateOopClosureRegionClosure blk(mr, cl); | |
1706 _hrs->iterate(&blk); | |
1707 } | |
1708 | |
1709 // Iterates an ObjectClosure over all objects within a HeapRegion. | |
1710 | |
1711 class IterateObjectClosureRegionClosure: public HeapRegionClosure { | |
1712 ObjectClosure* _cl; | |
1713 public: | |
1714 IterateObjectClosureRegionClosure(ObjectClosure* cl) : _cl(cl) {} | |
1715 bool doHeapRegion(HeapRegion* r) { | |
1716 if (! r->continuesHumongous()) { | |
1717 r->object_iterate(_cl); | |
1718 } | |
1719 return false; | |
1720 } | |
1721 }; | |
1722 | |
1723 void G1CollectedHeap::object_iterate(ObjectClosure* cl) { | |
1724 IterateObjectClosureRegionClosure blk(cl); | |
1725 _hrs->iterate(&blk); | |
1726 } | |
1727 | |
1728 void G1CollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { | |
1729 // FIXME: is this right? | |
1730 guarantee(false, "object_iterate_since_last_GC not supported by G1 heap"); | |
1731 } | |
1732 | |
1733 // Calls a SpaceClosure on a HeapRegion. | |
1734 | |
1735 class SpaceClosureRegionClosure: public HeapRegionClosure { | |
1736 SpaceClosure* _cl; | |
1737 public: | |
1738 SpaceClosureRegionClosure(SpaceClosure* cl) : _cl(cl) {} | |
1739 bool doHeapRegion(HeapRegion* r) { | |
1740 _cl->do_space(r); | |
1741 return false; | |
1742 } | |
1743 }; | |
1744 | |
1745 void G1CollectedHeap::space_iterate(SpaceClosure* cl) { | |
1746 SpaceClosureRegionClosure blk(cl); | |
1747 _hrs->iterate(&blk); | |
1748 } | |
1749 | |
1750 void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) { | |
1751 _hrs->iterate(cl); | |
1752 } | |
1753 | |
1754 void G1CollectedHeap::heap_region_iterate_from(HeapRegion* r, | |
1755 HeapRegionClosure* cl) { | |
1756 _hrs->iterate_from(r, cl); | |
1757 } | |
1758 | |
1759 void | |
1760 G1CollectedHeap::heap_region_iterate_from(int idx, HeapRegionClosure* cl) { | |
1761 _hrs->iterate_from(idx, cl); | |
1762 } | |
1763 | |
1764 HeapRegion* G1CollectedHeap::region_at(size_t idx) { return _hrs->at(idx); } | |
1765 | |
1766 void | |
1767 G1CollectedHeap::heap_region_par_iterate_chunked(HeapRegionClosure* cl, | |
1768 int worker, | |
1769 jint claim_value) { | |
355 | 1770 const size_t regions = n_regions(); |
1771 const size_t worker_num = (ParallelGCThreads > 0 ? ParallelGCThreads : 1); | |
1772 // try to spread out the starting points of the workers | |
1773 const size_t start_index = regions / worker_num * (size_t) worker; | |
1774 | |
1775 // each worker will actually look at all regions | |
1776 for (size_t count = 0; count < regions; ++count) { | |
1777 const size_t index = (start_index + count) % regions; | |
1778 assert(0 <= index && index < regions, "sanity"); | |
1779 HeapRegion* r = region_at(index); | |
1780 // we'll ignore "continues humongous" regions (we'll process them | |
1781 // when we come across their corresponding "start humongous" | |
1782 // region) and regions already claimed | |
1783 if (r->claim_value() == claim_value || r->continuesHumongous()) { | |
1784 continue; | |
1785 } | |
1786 // OK, try to claim it | |
342 | 1787 if (r->claimHeapRegion(claim_value)) { |
355 | 1788 // success! |
1789 assert(!r->continuesHumongous(), "sanity"); | |
1790 if (r->startsHumongous()) { | |
1791 // If the region is "starts humongous" we'll iterate over its | |
1792 // "continues humongous" first; in fact we'll do them | |
1793 // first. The order is important. In on case, calling the | |
1794 // closure on the "starts humongous" region might de-allocate | |
1795 // and clear all its "continues humongous" regions and, as a | |
1796 // result, we might end up processing them twice. So, we'll do | |
1797 // them first (notice: most closures will ignore them anyway) and | |
1798 // then we'll do the "starts humongous" region. | |
1799 for (size_t ch_index = index + 1; ch_index < regions; ++ch_index) { | |
1800 HeapRegion* chr = region_at(ch_index); | |
1801 | |
1802 // if the region has already been claimed or it's not | |
1803 // "continues humongous" we're done | |
1804 if (chr->claim_value() == claim_value || | |
1805 !chr->continuesHumongous()) { | |
1806 break; | |
1807 } | |
1808 | |
1809 // Noone should have claimed it directly. We can given | |
1810 // that we claimed its "starts humongous" region. | |
1811 assert(chr->claim_value() != claim_value, "sanity"); | |
1812 assert(chr->humongous_start_region() == r, "sanity"); | |
1813 | |
1814 if (chr->claimHeapRegion(claim_value)) { | |
1815 // we should always be able to claim it; noone else should | |
1816 // be trying to claim this region | |
1817 | |
1818 bool res2 = cl->doHeapRegion(chr); | |
1819 assert(!res2, "Should not abort"); | |
1820 | |
1821 // Right now, this holds (i.e., no closure that actually | |
1822 // does something with "continues humongous" regions | |
1823 // clears them). We might have to weaken it in the future, | |
1824 // but let's leave these two asserts here for extra safety. | |
1825 assert(chr->continuesHumongous(), "should still be the case"); | |
1826 assert(chr->humongous_start_region() == r, "sanity"); | |
1827 } else { | |
1828 guarantee(false, "we should not reach here"); | |
1829 } | |
1830 } | |
1831 } | |
1832 | |
1833 assert(!r->continuesHumongous(), "sanity"); | |
1834 bool res = cl->doHeapRegion(r); | |
1835 assert(!res, "Should not abort"); | |
1836 } | |
1837 } | |
1838 } | |
1839 | |
390 | 1840 class ResetClaimValuesClosure: public HeapRegionClosure { |
1841 public: | |
1842 bool doHeapRegion(HeapRegion* r) { | |
1843 r->set_claim_value(HeapRegion::InitialClaimValue); | |
1844 return false; | |
1845 } | |
1846 }; | |
1847 | |
1848 void | |
1849 G1CollectedHeap::reset_heap_region_claim_values() { | |
1850 ResetClaimValuesClosure blk; | |
1851 heap_region_iterate(&blk); | |
1852 } | |
1853 | |
355 | 1854 #ifdef ASSERT |
1855 // This checks whether all regions in the heap have the correct claim | |
1856 // value. I also piggy-backed on this a check to ensure that the | |
1857 // humongous_start_region() information on "continues humongous" | |
1858 // regions is correct. | |
1859 | |
1860 class CheckClaimValuesClosure : public HeapRegionClosure { | |
1861 private: | |
1862 jint _claim_value; | |
1863 size_t _failures; | |
1864 HeapRegion* _sh_region; | |
1865 public: | |
1866 CheckClaimValuesClosure(jint claim_value) : | |
1867 _claim_value(claim_value), _failures(0), _sh_region(NULL) { } | |
1868 bool doHeapRegion(HeapRegion* r) { | |
1869 if (r->claim_value() != _claim_value) { | |
1870 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
1871 "claim value = %d, should be %d", | |
1872 r->bottom(), r->end(), r->claim_value(), | |
1873 _claim_value); | |
1874 ++_failures; | |
1875 } | |
1876 if (!r->isHumongous()) { | |
1877 _sh_region = NULL; | |
1878 } else if (r->startsHumongous()) { | |
1879 _sh_region = r; | |
1880 } else if (r->continuesHumongous()) { | |
1881 if (r->humongous_start_region() != _sh_region) { | |
1882 gclog_or_tty->print_cr("Region ["PTR_FORMAT","PTR_FORMAT"), " | |
1883 "HS = "PTR_FORMAT", should be "PTR_FORMAT, | |
1884 r->bottom(), r->end(), | |
1885 r->humongous_start_region(), | |
1886 _sh_region); | |
1887 ++_failures; | |
342 | 1888 } |
1889 } | |
355 | 1890 return false; |
1891 } | |
1892 size_t failures() { | |
1893 return _failures; | |
1894 } | |
1895 }; | |
1896 | |
1897 bool G1CollectedHeap::check_heap_region_claim_values(jint claim_value) { | |
1898 CheckClaimValuesClosure cl(claim_value); | |
1899 heap_region_iterate(&cl); | |
1900 return cl.failures() == 0; | |
1901 } | |
1902 #endif // ASSERT | |
342 | 1903 |
1904 void G1CollectedHeap::collection_set_iterate(HeapRegionClosure* cl) { | |
1905 HeapRegion* r = g1_policy()->collection_set(); | |
1906 while (r != NULL) { | |
1907 HeapRegion* next = r->next_in_collection_set(); | |
1908 if (cl->doHeapRegion(r)) { | |
1909 cl->incomplete(); | |
1910 return; | |
1911 } | |
1912 r = next; | |
1913 } | |
1914 } | |
1915 | |
1916 void G1CollectedHeap::collection_set_iterate_from(HeapRegion* r, | |
1917 HeapRegionClosure *cl) { | |
1918 assert(r->in_collection_set(), | |
1919 "Start region must be a member of the collection set."); | |
1920 HeapRegion* cur = r; | |
1921 while (cur != NULL) { | |
1922 HeapRegion* next = cur->next_in_collection_set(); | |
1923 if (cl->doHeapRegion(cur) && false) { | |
1924 cl->incomplete(); | |
1925 return; | |
1926 } | |
1927 cur = next; | |
1928 } | |
1929 cur = g1_policy()->collection_set(); | |
1930 while (cur != r) { | |
1931 HeapRegion* next = cur->next_in_collection_set(); | |
1932 if (cl->doHeapRegion(cur) && false) { | |
1933 cl->incomplete(); | |
1934 return; | |
1935 } | |
1936 cur = next; | |
1937 } | |
1938 } | |
1939 | |
1940 CompactibleSpace* G1CollectedHeap::first_compactible_space() { | |
1941 return _hrs->length() > 0 ? _hrs->at(0) : NULL; | |
1942 } | |
1943 | |
1944 | |
1945 Space* G1CollectedHeap::space_containing(const void* addr) const { | |
1946 Space* res = heap_region_containing(addr); | |
1947 if (res == NULL) | |
1948 res = perm_gen()->space_containing(addr); | |
1949 return res; | |
1950 } | |
1951 | |
1952 HeapWord* G1CollectedHeap::block_start(const void* addr) const { | |
1953 Space* sp = space_containing(addr); | |
1954 if (sp != NULL) { | |
1955 return sp->block_start(addr); | |
1956 } | |
1957 return NULL; | |
1958 } | |
1959 | |
1960 size_t G1CollectedHeap::block_size(const HeapWord* addr) const { | |
1961 Space* sp = space_containing(addr); | |
1962 assert(sp != NULL, "block_size of address outside of heap"); | |
1963 return sp->block_size(addr); | |
1964 } | |
1965 | |
1966 bool G1CollectedHeap::block_is_obj(const HeapWord* addr) const { | |
1967 Space* sp = space_containing(addr); | |
1968 return sp->block_is_obj(addr); | |
1969 } | |
1970 | |
1971 bool G1CollectedHeap::supports_tlab_allocation() const { | |
1972 return true; | |
1973 } | |
1974 | |
1975 size_t G1CollectedHeap::tlab_capacity(Thread* ignored) const { | |
1976 return HeapRegion::GrainBytes; | |
1977 } | |
1978 | |
1979 size_t G1CollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { | |
1980 // Return the remaining space in the cur alloc region, but not less than | |
1981 // the min TLAB size. | |
1982 // Also, no more than half the region size, since we can't allow tlabs to | |
1983 // grow big enough to accomodate humongous objects. | |
1984 | |
1985 // We need to story it locally, since it might change between when we | |
1986 // test for NULL and when we use it later. | |
1987 ContiguousSpace* cur_alloc_space = _cur_alloc_region; | |
1988 if (cur_alloc_space == NULL) { | |
1989 return HeapRegion::GrainBytes/2; | |
1990 } else { | |
1991 return MAX2(MIN2(cur_alloc_space->free(), | |
1992 (size_t)(HeapRegion::GrainBytes/2)), | |
1993 (size_t)MinTLABSize); | |
1994 } | |
1995 } | |
1996 | |
1997 HeapWord* G1CollectedHeap::allocate_new_tlab(size_t size) { | |
1998 bool dummy; | |
1999 return G1CollectedHeap::mem_allocate(size, false, true, &dummy); | |
2000 } | |
2001 | |
2002 bool G1CollectedHeap::allocs_are_zero_filled() { | |
2003 return false; | |
2004 } | |
2005 | |
2006 size_t G1CollectedHeap::large_typearray_limit() { | |
2007 // FIXME | |
2008 return HeapRegion::GrainBytes/HeapWordSize; | |
2009 } | |
2010 | |
2011 size_t G1CollectedHeap::max_capacity() const { | |
2012 return _g1_committed.byte_size(); | |
2013 } | |
2014 | |
2015 jlong G1CollectedHeap::millis_since_last_gc() { | |
2016 // assert(false, "NYI"); | |
2017 return 0; | |
2018 } | |
2019 | |
2020 | |
2021 void G1CollectedHeap::prepare_for_verify() { | |
2022 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
2023 ensure_parsability(false); | |
2024 } | |
2025 g1_rem_set()->prepare_for_verify(); | |
2026 } | |
2027 | |
2028 class VerifyLivenessOopClosure: public OopClosure { | |
2029 G1CollectedHeap* g1h; | |
2030 public: | |
2031 VerifyLivenessOopClosure(G1CollectedHeap* _g1h) { | |
2032 g1h = _g1h; | |
2033 } | |
2034 void do_oop(narrowOop *p) { | |
2035 guarantee(false, "NYI"); | |
2036 } | |
2037 void do_oop(oop *p) { | |
2038 oop obj = *p; | |
2039 assert(obj == NULL || !g1h->is_obj_dead(obj), | |
2040 "Dead object referenced by a not dead object"); | |
2041 } | |
2042 }; | |
2043 | |
2044 class VerifyObjsInRegionClosure: public ObjectClosure { | |
2045 G1CollectedHeap* _g1h; | |
2046 size_t _live_bytes; | |
2047 HeapRegion *_hr; | |
2048 public: | |
2049 VerifyObjsInRegionClosure(HeapRegion *hr) : _live_bytes(0), _hr(hr) { | |
2050 _g1h = G1CollectedHeap::heap(); | |
2051 } | |
2052 void do_object(oop o) { | |
2053 VerifyLivenessOopClosure isLive(_g1h); | |
2054 assert(o != NULL, "Huh?"); | |
2055 if (!_g1h->is_obj_dead(o)) { | |
2056 o->oop_iterate(&isLive); | |
2057 if (!_hr->obj_allocated_since_prev_marking(o)) | |
2058 _live_bytes += (o->size() * HeapWordSize); | |
2059 } | |
2060 } | |
2061 size_t live_bytes() { return _live_bytes; } | |
2062 }; | |
2063 | |
2064 class PrintObjsInRegionClosure : public ObjectClosure { | |
2065 HeapRegion *_hr; | |
2066 G1CollectedHeap *_g1; | |
2067 public: | |
2068 PrintObjsInRegionClosure(HeapRegion *hr) : _hr(hr) { | |
2069 _g1 = G1CollectedHeap::heap(); | |
2070 }; | |
2071 | |
2072 void do_object(oop o) { | |
2073 if (o != NULL) { | |
2074 HeapWord *start = (HeapWord *) o; | |
2075 size_t word_sz = o->size(); | |
2076 gclog_or_tty->print("\nPrinting obj "PTR_FORMAT" of size " SIZE_FORMAT | |
2077 " isMarkedPrev %d isMarkedNext %d isAllocSince %d\n", | |
2078 (void*) o, word_sz, | |
2079 _g1->isMarkedPrev(o), | |
2080 _g1->isMarkedNext(o), | |
2081 _hr->obj_allocated_since_prev_marking(o)); | |
2082 HeapWord *end = start + word_sz; | |
2083 HeapWord *cur; | |
2084 int *val; | |
2085 for (cur = start; cur < end; cur++) { | |
2086 val = (int *) cur; | |
2087 gclog_or_tty->print("\t "PTR_FORMAT":"PTR_FORMAT"\n", val, *val); | |
2088 } | |
2089 } | |
2090 } | |
2091 }; | |
2092 | |
2093 class VerifyRegionClosure: public HeapRegionClosure { | |
2094 public: | |
2095 bool _allow_dirty; | |
390 | 2096 bool _par; |
2097 VerifyRegionClosure(bool allow_dirty, bool par = false) | |
2098 : _allow_dirty(allow_dirty), _par(par) {} | |
342 | 2099 bool doHeapRegion(HeapRegion* r) { |
390 | 2100 guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue, |
2101 "Should be unclaimed at verify points."); | |
342 | 2102 if (r->isHumongous()) { |
2103 if (r->startsHumongous()) { | |
2104 // Verify the single H object. | |
2105 oop(r->bottom())->verify(); | |
2106 size_t word_sz = oop(r->bottom())->size(); | |
2107 guarantee(r->top() == r->bottom() + word_sz, | |
2108 "Only one object in a humongous region"); | |
2109 } | |
2110 } else { | |
2111 VerifyObjsInRegionClosure not_dead_yet_cl(r); | |
2112 r->verify(_allow_dirty); | |
2113 r->object_iterate(¬_dead_yet_cl); | |
2114 guarantee(r->max_live_bytes() >= not_dead_yet_cl.live_bytes(), | |
2115 "More live objects than counted in last complete marking."); | |
2116 } | |
2117 return false; | |
2118 } | |
2119 }; | |
2120 | |
2121 class VerifyRootsClosure: public OopsInGenClosure { | |
2122 private: | |
2123 G1CollectedHeap* _g1h; | |
2124 bool _failures; | |
2125 | |
2126 public: | |
2127 VerifyRootsClosure() : | |
2128 _g1h(G1CollectedHeap::heap()), _failures(false) { } | |
2129 | |
2130 bool failures() { return _failures; } | |
2131 | |
2132 void do_oop(narrowOop* p) { | |
2133 guarantee(false, "NYI"); | |
2134 } | |
2135 | |
2136 void do_oop(oop* p) { | |
2137 oop obj = *p; | |
2138 if (obj != NULL) { | |
2139 if (_g1h->is_obj_dead(obj)) { | |
2140 gclog_or_tty->print_cr("Root location "PTR_FORMAT" " | |
2141 "points to dead obj "PTR_FORMAT, p, (void*) obj); | |
2142 obj->print_on(gclog_or_tty); | |
2143 _failures = true; | |
2144 } | |
2145 } | |
2146 } | |
2147 }; | |
2148 | |
390 | 2149 // This is the task used for parallel heap verification. |
2150 | |
2151 class G1ParVerifyTask: public AbstractGangTask { | |
2152 private: | |
2153 G1CollectedHeap* _g1h; | |
2154 bool _allow_dirty; | |
2155 | |
2156 public: | |
2157 G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty) : | |
2158 AbstractGangTask("Parallel verify task"), | |
2159 _g1h(g1h), _allow_dirty(allow_dirty) { } | |
2160 | |
2161 void work(int worker_i) { | |
2162 VerifyRegionClosure blk(_allow_dirty, true); | |
2163 _g1h->heap_region_par_iterate_chunked(&blk, worker_i, | |
2164 HeapRegion::ParVerifyClaimValue); | |
2165 } | |
2166 }; | |
2167 | |
342 | 2168 void G1CollectedHeap::verify(bool allow_dirty, bool silent) { |
2169 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) { | |
2170 if (!silent) { gclog_or_tty->print("roots "); } | |
2171 VerifyRootsClosure rootsCl; | |
2172 process_strong_roots(false, | |
2173 SharedHeap::SO_AllClasses, | |
2174 &rootsCl, | |
2175 &rootsCl); | |
2176 rem_set()->invalidate(perm_gen()->used_region(), false); | |
2177 if (!silent) { gclog_or_tty->print("heapRegions "); } | |
390 | 2178 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) { |
2179 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2180 "sanity check"); | |
2181 | |
2182 G1ParVerifyTask task(this, allow_dirty); | |
2183 int n_workers = workers()->total_workers(); | |
2184 set_par_threads(n_workers); | |
2185 workers()->run_task(&task); | |
2186 set_par_threads(0); | |
2187 | |
2188 assert(check_heap_region_claim_values(HeapRegion::ParVerifyClaimValue), | |
2189 "sanity check"); | |
2190 | |
2191 reset_heap_region_claim_values(); | |
2192 | |
2193 assert(check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2194 "sanity check"); | |
2195 } else { | |
2196 VerifyRegionClosure blk(allow_dirty); | |
2197 _hrs->iterate(&blk); | |
2198 } | |
342 | 2199 if (!silent) gclog_or_tty->print("remset "); |
2200 rem_set()->verify(); | |
2201 guarantee(!rootsCl.failures(), "should not have had failures"); | |
2202 } else { | |
2203 if (!silent) gclog_or_tty->print("(SKIPPING roots, heapRegions, remset) "); | |
2204 } | |
2205 } | |
2206 | |
2207 class PrintRegionClosure: public HeapRegionClosure { | |
2208 outputStream* _st; | |
2209 public: | |
2210 PrintRegionClosure(outputStream* st) : _st(st) {} | |
2211 bool doHeapRegion(HeapRegion* r) { | |
2212 r->print_on(_st); | |
2213 return false; | |
2214 } | |
2215 }; | |
2216 | |
2217 void G1CollectedHeap::print() const { print_on(gclog_or_tty); } | |
2218 | |
2219 void G1CollectedHeap::print_on(outputStream* st) const { | |
2220 PrintRegionClosure blk(st); | |
2221 _hrs->iterate(&blk); | |
2222 } | |
2223 | |
2224 void G1CollectedHeap::print_gc_threads_on(outputStream* st) const { | |
2225 if (ParallelGCThreads > 0) { | |
2226 workers()->print_worker_threads(); | |
2227 } | |
2228 st->print("\"G1 concurrent mark GC Thread\" "); | |
2229 _cmThread->print(); | |
2230 st->cr(); | |
2231 st->print("\"G1 concurrent refinement GC Thread\" "); | |
2232 _cg1r->cg1rThread()->print_on(st); | |
2233 st->cr(); | |
2234 st->print("\"G1 zero-fill GC Thread\" "); | |
2235 _czft->print_on(st); | |
2236 st->cr(); | |
2237 } | |
2238 | |
2239 void G1CollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
2240 if (ParallelGCThreads > 0) { | |
2241 workers()->threads_do(tc); | |
2242 } | |
2243 tc->do_thread(_cmThread); | |
2244 tc->do_thread(_cg1r->cg1rThread()); | |
2245 tc->do_thread(_czft); | |
2246 } | |
2247 | |
2248 void G1CollectedHeap::print_tracing_info() const { | |
2249 concurrent_g1_refine()->print_final_card_counts(); | |
2250 | |
2251 // We'll overload this to mean "trace GC pause statistics." | |
2252 if (TraceGen0Time || TraceGen1Time) { | |
2253 // The "G1CollectorPolicy" is keeping track of these stats, so delegate | |
2254 // to that. | |
2255 g1_policy()->print_tracing_info(); | |
2256 } | |
2257 if (SummarizeG1RSStats) { | |
2258 g1_rem_set()->print_summary_info(); | |
2259 } | |
2260 if (SummarizeG1ConcMark) { | |
2261 concurrent_mark()->print_summary_info(); | |
2262 } | |
2263 if (SummarizeG1ZFStats) { | |
2264 ConcurrentZFThread::print_summary_info(); | |
2265 } | |
2266 if (G1SummarizePopularity) { | |
2267 print_popularity_summary_info(); | |
2268 } | |
2269 g1_policy()->print_yg_surv_rate_info(); | |
2270 | |
2271 GCOverheadReporter::printGCOverhead(); | |
2272 | |
2273 SpecializationStats::print(); | |
2274 } | |
2275 | |
2276 | |
2277 int G1CollectedHeap::addr_to_arena_id(void* addr) const { | |
2278 HeapRegion* hr = heap_region_containing(addr); | |
2279 if (hr == NULL) { | |
2280 return 0; | |
2281 } else { | |
2282 return 1; | |
2283 } | |
2284 } | |
2285 | |
2286 G1CollectedHeap* G1CollectedHeap::heap() { | |
2287 assert(_sh->kind() == CollectedHeap::G1CollectedHeap, | |
2288 "not a garbage-first heap"); | |
2289 return _g1h; | |
2290 } | |
2291 | |
2292 void G1CollectedHeap::gc_prologue(bool full /* Ignored */) { | |
2293 if (PrintHeapAtGC){ | |
2294 gclog_or_tty->print_cr(" {Heap before GC collections=%d:", total_collections()); | |
2295 Universe::print(); | |
2296 } | |
2297 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); | |
2298 // Call allocation profiler | |
2299 AllocationProfiler::iterate_since_last_gc(); | |
2300 // Fill TLAB's and such | |
2301 ensure_parsability(true); | |
2302 } | |
2303 | |
2304 void G1CollectedHeap::gc_epilogue(bool full /* Ignored */) { | |
2305 // FIXME: what is this about? | |
2306 // I'm ignoring the "fill_newgen()" call if "alloc_event_enabled" | |
2307 // is set. | |
2308 COMPILER2_PRESENT(assert(DerivedPointerTable::is_empty(), | |
2309 "derived pointer present")); | |
2310 | |
2311 if (PrintHeapAtGC){ | |
2312 gclog_or_tty->print_cr(" Heap after GC collections=%d:", total_collections()); | |
2313 Universe::print(); | |
2314 gclog_or_tty->print("} "); | |
2315 } | |
2316 } | |
2317 | |
2318 void G1CollectedHeap::do_collection_pause() { | |
2319 // Read the GC count while holding the Heap_lock | |
2320 // we need to do this _before_ wait_for_cleanup_complete(), to | |
2321 // ensure that we do not give up the heap lock and potentially | |
2322 // pick up the wrong count | |
2323 int gc_count_before = SharedHeap::heap()->total_collections(); | |
2324 | |
2325 // Don't want to do a GC pause while cleanup is being completed! | |
2326 wait_for_cleanup_complete(); | |
2327 | |
2328 g1_policy()->record_stop_world_start(); | |
2329 { | |
2330 MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back | |
2331 VM_G1IncCollectionPause op(gc_count_before); | |
2332 VMThread::execute(&op); | |
2333 } | |
2334 } | |
2335 | |
2336 void | |
2337 G1CollectedHeap::doConcurrentMark() { | |
2338 if (G1ConcMark) { | |
2339 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); | |
2340 if (!_cmThread->in_progress()) { | |
2341 _cmThread->set_started(); | |
2342 CGC_lock->notify(); | |
2343 } | |
2344 } | |
2345 } | |
2346 | |
2347 class VerifyMarkedObjsClosure: public ObjectClosure { | |
2348 G1CollectedHeap* _g1h; | |
2349 public: | |
2350 VerifyMarkedObjsClosure(G1CollectedHeap* g1h) : _g1h(g1h) {} | |
2351 void do_object(oop obj) { | |
2352 assert(obj->mark()->is_marked() ? !_g1h->is_obj_dead(obj) : true, | |
2353 "markandsweep mark should agree with concurrent deadness"); | |
2354 } | |
2355 }; | |
2356 | |
2357 void | |
2358 G1CollectedHeap::checkConcurrentMark() { | |
2359 VerifyMarkedObjsClosure verifycl(this); | |
2360 // MutexLockerEx x(getMarkBitMapLock(), | |
2361 // Mutex::_no_safepoint_check_flag); | |
2362 object_iterate(&verifycl); | |
2363 } | |
2364 | |
2365 void G1CollectedHeap::do_sync_mark() { | |
2366 _cm->checkpointRootsInitial(); | |
2367 _cm->markFromRoots(); | |
2368 _cm->checkpointRootsFinal(false); | |
2369 } | |
2370 | |
2371 // <NEW PREDICTION> | |
2372 | |
2373 double G1CollectedHeap::predict_region_elapsed_time_ms(HeapRegion *hr, | |
2374 bool young) { | |
2375 return _g1_policy->predict_region_elapsed_time_ms(hr, young); | |
2376 } | |
2377 | |
2378 void G1CollectedHeap::check_if_region_is_too_expensive(double | |
2379 predicted_time_ms) { | |
2380 _g1_policy->check_if_region_is_too_expensive(predicted_time_ms); | |
2381 } | |
2382 | |
2383 size_t G1CollectedHeap::pending_card_num() { | |
2384 size_t extra_cards = 0; | |
2385 JavaThread *curr = Threads::first(); | |
2386 while (curr != NULL) { | |
2387 DirtyCardQueue& dcq = curr->dirty_card_queue(); | |
2388 extra_cards += dcq.size(); | |
2389 curr = curr->next(); | |
2390 } | |
2391 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
2392 size_t buffer_size = dcqs.buffer_size(); | |
2393 size_t buffer_num = dcqs.completed_buffers_num(); | |
2394 return buffer_size * buffer_num + extra_cards; | |
2395 } | |
2396 | |
2397 size_t G1CollectedHeap::max_pending_card_num() { | |
2398 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
2399 size_t buffer_size = dcqs.buffer_size(); | |
2400 size_t buffer_num = dcqs.completed_buffers_num(); | |
2401 int thread_num = Threads::number_of_threads(); | |
2402 return (buffer_num + thread_num) * buffer_size; | |
2403 } | |
2404 | |
2405 size_t G1CollectedHeap::cards_scanned() { | |
2406 HRInto_G1RemSet* g1_rset = (HRInto_G1RemSet*) g1_rem_set(); | |
2407 return g1_rset->cardsScanned(); | |
2408 } | |
2409 | |
2410 void | |
2411 G1CollectedHeap::setup_surviving_young_words() { | |
2412 guarantee( _surviving_young_words == NULL, "pre-condition" ); | |
2413 size_t array_length = g1_policy()->young_cset_length(); | |
2414 _surviving_young_words = NEW_C_HEAP_ARRAY(size_t, array_length); | |
2415 if (_surviving_young_words == NULL) { | |
2416 vm_exit_out_of_memory(sizeof(size_t) * array_length, | |
2417 "Not enough space for young surv words summary."); | |
2418 } | |
2419 memset(_surviving_young_words, 0, array_length * sizeof(size_t)); | |
2420 for (size_t i = 0; i < array_length; ++i) { | |
2421 guarantee( _surviving_young_words[i] == 0, "invariant" ); | |
2422 } | |
2423 } | |
2424 | |
2425 void | |
2426 G1CollectedHeap::update_surviving_young_words(size_t* surv_young_words) { | |
2427 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
2428 size_t array_length = g1_policy()->young_cset_length(); | |
2429 for (size_t i = 0; i < array_length; ++i) | |
2430 _surviving_young_words[i] += surv_young_words[i]; | |
2431 } | |
2432 | |
2433 void | |
2434 G1CollectedHeap::cleanup_surviving_young_words() { | |
2435 guarantee( _surviving_young_words != NULL, "pre-condition" ); | |
2436 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words); | |
2437 _surviving_young_words = NULL; | |
2438 } | |
2439 | |
2440 // </NEW PREDICTION> | |
2441 | |
2442 void | |
2443 G1CollectedHeap::do_collection_pause_at_safepoint(HeapRegion* popular_region) { | |
2444 char verbose_str[128]; | |
2445 sprintf(verbose_str, "GC pause "); | |
2446 if (popular_region != NULL) | |
2447 strcat(verbose_str, "(popular)"); | |
2448 else if (g1_policy()->in_young_gc_mode()) { | |
2449 if (g1_policy()->full_young_gcs()) | |
2450 strcat(verbose_str, "(young)"); | |
2451 else | |
2452 strcat(verbose_str, "(partial)"); | |
2453 } | |
2454 bool reset_should_initiate_conc_mark = false; | |
2455 if (popular_region != NULL && g1_policy()->should_initiate_conc_mark()) { | |
2456 // we currently do not allow an initial mark phase to be piggy-backed | |
2457 // on a popular pause | |
2458 reset_should_initiate_conc_mark = true; | |
2459 g1_policy()->unset_should_initiate_conc_mark(); | |
2460 } | |
2461 if (g1_policy()->should_initiate_conc_mark()) | |
2462 strcat(verbose_str, " (initial-mark)"); | |
2463 | |
2464 GCCauseSetter x(this, (popular_region == NULL ? | |
2465 GCCause::_g1_inc_collection_pause : | |
2466 GCCause::_g1_pop_region_collection_pause)); | |
2467 | |
2468 // if PrintGCDetails is on, we'll print long statistics information | |
2469 // in the collector policy code, so let's not print this as the output | |
2470 // is messy if we do. | |
2471 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); | |
2472 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
2473 TraceTime t(verbose_str, PrintGC && !PrintGCDetails, true, gclog_or_tty); | |
2474 | |
2475 ResourceMark rm; | |
2476 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
2477 assert(Thread::current() == VMThread::vm_thread(), "should be in vm thread"); | |
2478 guarantee(!is_gc_active(), "collection is not reentrant"); | |
2479 assert(regions_accounted_for(), "Region leakage!"); | |
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2481 increment_gc_time_stamp(); |
342 | 2482 |
2483 if (g1_policy()->in_young_gc_mode()) { | |
2484 assert(check_young_list_well_formed(), | |
2485 "young list should be well formed"); | |
2486 } | |
2487 | |
2488 if (GC_locker::is_active()) { | |
2489 return; // GC is disabled (e.g. JNI GetXXXCritical operation) | |
2490 } | |
2491 | |
2492 bool abandoned = false; | |
2493 { // Call to jvmpi::post_class_unload_events must occur outside of active GC | |
2494 IsGCActiveMark x; | |
2495 | |
2496 gc_prologue(false); | |
2497 increment_total_collections(); | |
2498 | |
2499 #if G1_REM_SET_LOGGING | |
2500 gclog_or_tty->print_cr("\nJust chose CS, heap:"); | |
2501 print(); | |
2502 #endif | |
2503 | |
2504 if (VerifyBeforeGC && total_collections() >= VerifyGCStartAt) { | |
2505 HandleMark hm; // Discard invalid handles created during verification | |
2506 prepare_for_verify(); | |
2507 gclog_or_tty->print(" VerifyBeforeGC:"); | |
2508 Universe::verify(false); | |
2509 } | |
2510 | |
2511 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
2512 | |
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2513 // We want to turn off ref discovery, if necessary, and turn it back on |
342 | 2514 // on again later if we do. |
2515 bool was_enabled = ref_processor()->discovery_enabled(); | |
2516 if (was_enabled) ref_processor()->disable_discovery(); | |
2517 | |
2518 // Forget the current alloc region (we might even choose it to be part | |
2519 // of the collection set!). | |
2520 abandon_cur_alloc_region(); | |
2521 | |
2522 // The elapsed time induced by the start time below deliberately elides | |
2523 // the possible verification above. | |
2524 double start_time_sec = os::elapsedTime(); | |
2525 GCOverheadReporter::recordSTWStart(start_time_sec); | |
2526 size_t start_used_bytes = used(); | |
2527 if (!G1ConcMark) { | |
2528 do_sync_mark(); | |
2529 } | |
2530 | |
2531 g1_policy()->record_collection_pause_start(start_time_sec, | |
2532 start_used_bytes); | |
2533 | |
526 | 2534 guarantee(_in_cset_fast_test == NULL, "invariant"); |
2535 guarantee(_in_cset_fast_test_base == NULL, "invariant"); | |
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2536 _in_cset_fast_test_length = max_regions(); |
526 | 2537 _in_cset_fast_test_base = |
2538 NEW_C_HEAP_ARRAY(bool, _in_cset_fast_test_length); | |
2539 memset(_in_cset_fast_test_base, false, | |
2540 _in_cset_fast_test_length * sizeof(bool)); | |
2541 // We're biasing _in_cset_fast_test to avoid subtracting the | |
2542 // beginning of the heap every time we want to index; basically | |
2543 // it's the same with what we do with the card table. | |
2544 _in_cset_fast_test = _in_cset_fast_test_base - | |
2545 ((size_t) _g1_reserved.start() >> HeapRegion::LogOfHRGrainBytes); | |
2546 | |
342 | 2547 #if SCAN_ONLY_VERBOSE |
2548 _young_list->print(); | |
2549 #endif // SCAN_ONLY_VERBOSE | |
2550 | |
2551 if (g1_policy()->should_initiate_conc_mark()) { | |
2552 concurrent_mark()->checkpointRootsInitialPre(); | |
2553 } | |
2554 save_marks(); | |
2555 | |
605 | 2556 // We must do this before any possible evacuation that should propagate |
342 | 2557 // marks, including evacuation of popular objects in a popular pause. |
2558 if (mark_in_progress()) { | |
2559 double start_time_sec = os::elapsedTime(); | |
2560 | |
2561 _cm->drainAllSATBBuffers(); | |
2562 double finish_mark_ms = (os::elapsedTime() - start_time_sec) * 1000.0; | |
2563 g1_policy()->record_satb_drain_time(finish_mark_ms); | |
2564 | |
2565 } | |
2566 // Record the number of elements currently on the mark stack, so we | |
2567 // only iterate over these. (Since evacuation may add to the mark | |
2568 // stack, doing more exposes race conditions.) If no mark is in | |
2569 // progress, this will be zero. | |
2570 _cm->set_oops_do_bound(); | |
2571 | |
2572 assert(regions_accounted_for(), "Region leakage."); | |
2573 | |
2574 bool abandoned = false; | |
2575 | |
2576 if (mark_in_progress()) | |
2577 concurrent_mark()->newCSet(); | |
2578 | |
2579 // Now choose the CS. | |
2580 if (popular_region == NULL) { | |
2581 g1_policy()->choose_collection_set(); | |
2582 } else { | |
2583 // We may be evacuating a single region (for popularity). | |
2584 g1_policy()->record_popular_pause_preamble_start(); | |
2585 popularity_pause_preamble(popular_region); | |
2586 g1_policy()->record_popular_pause_preamble_end(); | |
2587 abandoned = (g1_policy()->collection_set() == NULL); | |
2588 // Now we allow more regions to be added (we have to collect | |
2589 // all popular regions). | |
2590 if (!abandoned) { | |
2591 g1_policy()->choose_collection_set(popular_region); | |
2592 } | |
2593 } | |
2594 // We may abandon a pause if we find no region that will fit in the MMU | |
2595 // pause. | |
2596 abandoned = (g1_policy()->collection_set() == NULL); | |
2597 | |
2598 // Nothing to do if we were unable to choose a collection set. | |
2599 if (!abandoned) { | |
2600 #if G1_REM_SET_LOGGING | |
2601 gclog_or_tty->print_cr("\nAfter pause, heap:"); | |
2602 print(); | |
2603 #endif | |
2604 | |
2605 setup_surviving_young_words(); | |
2606 | |
2607 // Set up the gc allocation regions. | |
2608 get_gc_alloc_regions(); | |
2609 | |
2610 // Actually do the work... | |
2611 evacuate_collection_set(); | |
2612 free_collection_set(g1_policy()->collection_set()); | |
2613 g1_policy()->clear_collection_set(); | |
2614 | |
526 | 2615 FREE_C_HEAP_ARRAY(bool, _in_cset_fast_test_base); |
2616 // this is more for peace of mind; we're nulling them here and | |
2617 // we're expecting them to be null at the beginning of the next GC | |
2618 _in_cset_fast_test = NULL; | |
2619 _in_cset_fast_test_base = NULL; | |
2620 | |
342 | 2621 if (popular_region != NULL) { |
2622 // We have to wait until now, because we don't want the region to | |
2623 // be rescheduled for pop-evac during RS update. | |
2624 popular_region->set_popular_pending(false); | |
2625 } | |
2626 | |
2627 release_gc_alloc_regions(); | |
2628 | |
2629 cleanup_surviving_young_words(); | |
2630 | |
2631 if (g1_policy()->in_young_gc_mode()) { | |
2632 _young_list->reset_sampled_info(); | |
2633 assert(check_young_list_empty(true), | |
2634 "young list should be empty"); | |
2635 | |
2636 #if SCAN_ONLY_VERBOSE | |
2637 _young_list->print(); | |
2638 #endif // SCAN_ONLY_VERBOSE | |
2639 | |
545 | 2640 g1_policy()->record_survivor_regions(_young_list->survivor_length(), |
2641 _young_list->first_survivor_region(), | |
2642 _young_list->last_survivor_region()); | |
342 | 2643 _young_list->reset_auxilary_lists(); |
2644 } | |
2645 } else { | |
2646 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
2647 } | |
2648 | |
2649 if (evacuation_failed()) { | |
2650 _summary_bytes_used = recalculate_used(); | |
2651 } else { | |
2652 // The "used" of the the collection set have already been subtracted | |
2653 // when they were freed. Add in the bytes evacuated. | |
2654 _summary_bytes_used += g1_policy()->bytes_in_to_space(); | |
2655 } | |
2656 | |
2657 if (g1_policy()->in_young_gc_mode() && | |
2658 g1_policy()->should_initiate_conc_mark()) { | |
2659 concurrent_mark()->checkpointRootsInitialPost(); | |
2660 set_marking_started(); | |
2661 doConcurrentMark(); | |
2662 } | |
2663 | |
2664 #if SCAN_ONLY_VERBOSE | |
2665 _young_list->print(); | |
2666 #endif // SCAN_ONLY_VERBOSE | |
2667 | |
2668 double end_time_sec = os::elapsedTime(); | |
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2669 double pause_time_ms = (end_time_sec - start_time_sec) * MILLIUNITS; |
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2670 g1_policy()->record_pause_time_ms(pause_time_ms); |
342 | 2671 GCOverheadReporter::recordSTWEnd(end_time_sec); |
2672 g1_policy()->record_collection_pause_end(popular_region != NULL, | |
2673 abandoned); | |
2674 | |
2675 assert(regions_accounted_for(), "Region leakage."); | |
2676 | |
2677 if (VerifyAfterGC && total_collections() >= VerifyGCStartAt) { | |
2678 HandleMark hm; // Discard invalid handles created during verification | |
2679 gclog_or_tty->print(" VerifyAfterGC:"); | |
2680 Universe::verify(false); | |
2681 } | |
2682 | |
2683 if (was_enabled) ref_processor()->enable_discovery(); | |
2684 | |
2685 { | |
2686 size_t expand_bytes = g1_policy()->expansion_amount(); | |
2687 if (expand_bytes > 0) { | |
2688 size_t bytes_before = capacity(); | |
2689 expand(expand_bytes); | |
2690 } | |
2691 } | |
2692 | |
546
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2693 if (mark_in_progress()) { |
342 | 2694 concurrent_mark()->update_g1_committed(); |
546
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2695 } |
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2696 |
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2697 #ifdef TRACESPINNING |
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2698 ParallelTaskTerminator::print_termination_counts(); |
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2699 #endif |
342 | 2700 |
2701 gc_epilogue(false); | |
2702 } | |
2703 | |
2704 assert(verify_region_lists(), "Bad region lists."); | |
2705 | |
2706 if (reset_should_initiate_conc_mark) | |
2707 g1_policy()->set_should_initiate_conc_mark(); | |
2708 | |
2709 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { | |
2710 gclog_or_tty->print_cr("Stopping after GC #%d", ExitAfterGCNum); | |
2711 print_tracing_info(); | |
2712 vm_exit(-1); | |
2713 } | |
2714 } | |
2715 | |
2716 void G1CollectedHeap::set_gc_alloc_region(int purpose, HeapRegion* r) { | |
2717 assert(purpose >= 0 && purpose < GCAllocPurposeCount, "invalid purpose"); | |
2718 HeapWord* original_top = NULL; | |
2719 if (r != NULL) | |
2720 original_top = r->top(); | |
2721 | |
2722 // We will want to record the used space in r as being there before gc. | |
2723 // One we install it as a GC alloc region it's eligible for allocation. | |
2724 // So record it now and use it later. | |
2725 size_t r_used = 0; | |
2726 if (r != NULL) { | |
2727 r_used = r->used(); | |
2728 | |
2729 if (ParallelGCThreads > 0) { | |
2730 // need to take the lock to guard against two threads calling | |
2731 // get_gc_alloc_region concurrently (very unlikely but...) | |
2732 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
2733 r->save_marks(); | |
2734 } | |
2735 } | |
2736 HeapRegion* old_alloc_region = _gc_alloc_regions[purpose]; | |
2737 _gc_alloc_regions[purpose] = r; | |
2738 if (old_alloc_region != NULL) { | |
2739 // Replace aliases too. | |
2740 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
2741 if (_gc_alloc_regions[ap] == old_alloc_region) { | |
2742 _gc_alloc_regions[ap] = r; | |
2743 } | |
2744 } | |
2745 } | |
2746 if (r != NULL) { | |
2747 push_gc_alloc_region(r); | |
2748 if (mark_in_progress() && original_top != r->next_top_at_mark_start()) { | |
2749 // We are using a region as a GC alloc region after it has been used | |
2750 // as a mutator allocation region during the current marking cycle. | |
2751 // The mutator-allocated objects are currently implicitly marked, but | |
2752 // when we move hr->next_top_at_mark_start() forward at the the end | |
2753 // of the GC pause, they won't be. We therefore mark all objects in | |
2754 // the "gap". We do this object-by-object, since marking densely | |
2755 // does not currently work right with marking bitmap iteration. This | |
2756 // means we rely on TLAB filling at the start of pauses, and no | |
2757 // "resuscitation" of filled TLAB's. If we want to do this, we need | |
2758 // to fix the marking bitmap iteration. | |
2759 HeapWord* curhw = r->next_top_at_mark_start(); | |
2760 HeapWord* t = original_top; | |
2761 | |
2762 while (curhw < t) { | |
2763 oop cur = (oop)curhw; | |
2764 // We'll assume parallel for generality. This is rare code. | |
2765 concurrent_mark()->markAndGrayObjectIfNecessary(cur); // can't we just mark them? | |
2766 curhw = curhw + cur->size(); | |
2767 } | |
2768 assert(curhw == t, "Should have parsed correctly."); | |
2769 } | |
2770 if (G1PolicyVerbose > 1) { | |
2771 gclog_or_tty->print("New alloc region ["PTR_FORMAT", "PTR_FORMAT", " PTR_FORMAT") " | |
2772 "for survivors:", r->bottom(), original_top, r->end()); | |
2773 r->print(); | |
2774 } | |
2775 g1_policy()->record_before_bytes(r_used); | |
2776 } | |
2777 } | |
2778 | |
2779 void G1CollectedHeap::push_gc_alloc_region(HeapRegion* hr) { | |
2780 assert(Thread::current()->is_VM_thread() || | |
2781 par_alloc_during_gc_lock()->owned_by_self(), "Precondition"); | |
2782 assert(!hr->is_gc_alloc_region() && !hr->in_collection_set(), | |
2783 "Precondition."); | |
2784 hr->set_is_gc_alloc_region(true); | |
2785 hr->set_next_gc_alloc_region(_gc_alloc_region_list); | |
2786 _gc_alloc_region_list = hr; | |
2787 } | |
2788 | |
2789 #ifdef G1_DEBUG | |
2790 class FindGCAllocRegion: public HeapRegionClosure { | |
2791 public: | |
2792 bool doHeapRegion(HeapRegion* r) { | |
2793 if (r->is_gc_alloc_region()) { | |
2794 gclog_or_tty->print_cr("Region %d ["PTR_FORMAT"...] is still a gc_alloc_region.", | |
2795 r->hrs_index(), r->bottom()); | |
2796 } | |
2797 return false; | |
2798 } | |
2799 }; | |
2800 #endif // G1_DEBUG | |
2801 | |
2802 void G1CollectedHeap::forget_alloc_region_list() { | |
2803 assert(Thread::current()->is_VM_thread(), "Precondition"); | |
2804 while (_gc_alloc_region_list != NULL) { | |
2805 HeapRegion* r = _gc_alloc_region_list; | |
2806 assert(r->is_gc_alloc_region(), "Invariant."); | |
2807 _gc_alloc_region_list = r->next_gc_alloc_region(); | |
2808 r->set_next_gc_alloc_region(NULL); | |
2809 r->set_is_gc_alloc_region(false); | |
545 | 2810 if (r->is_survivor()) { |
2811 if (r->is_empty()) { | |
2812 r->set_not_young(); | |
2813 } else { | |
2814 _young_list->add_survivor_region(r); | |
2815 } | |
2816 } | |
342 | 2817 if (r->is_empty()) { |
2818 ++_free_regions; | |
2819 } | |
2820 } | |
2821 #ifdef G1_DEBUG | |
2822 FindGCAllocRegion fa; | |
2823 heap_region_iterate(&fa); | |
2824 #endif // G1_DEBUG | |
2825 } | |
2826 | |
2827 | |
2828 bool G1CollectedHeap::check_gc_alloc_regions() { | |
2829 // TODO: allocation regions check | |
2830 return true; | |
2831 } | |
2832 | |
2833 void G1CollectedHeap::get_gc_alloc_regions() { | |
2834 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
2835 // Create new GC alloc regions. | |
2836 HeapRegion* alloc_region = _gc_alloc_regions[ap]; | |
2837 // Clear this alloc region, so that in case it turns out to be | |
2838 // unacceptable, we end up with no allocation region, rather than a bad | |
2839 // one. | |
2840 _gc_alloc_regions[ap] = NULL; | |
2841 if (alloc_region == NULL || alloc_region->in_collection_set()) { | |
2842 // Can't re-use old one. Allocate a new one. | |
2843 alloc_region = newAllocRegionWithExpansion(ap, 0); | |
2844 } | |
2845 if (alloc_region != NULL) { | |
2846 set_gc_alloc_region(ap, alloc_region); | |
2847 } | |
2848 } | |
2849 // Set alternative regions for allocation purposes that have reached | |
2850 // thier limit. | |
2851 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
2852 GCAllocPurpose alt_purpose = g1_policy()->alternative_purpose(ap); | |
2853 if (_gc_alloc_regions[ap] == NULL && alt_purpose != ap) { | |
2854 _gc_alloc_regions[ap] = _gc_alloc_regions[alt_purpose]; | |
2855 } | |
2856 } | |
2857 assert(check_gc_alloc_regions(), "alloc regions messed up"); | |
2858 } | |
2859 | |
2860 void G1CollectedHeap::release_gc_alloc_regions() { | |
2861 // We keep a separate list of all regions that have been alloc regions in | |
2862 // the current collection pause. Forget that now. | |
2863 forget_alloc_region_list(); | |
2864 | |
2865 // The current alloc regions contain objs that have survived | |
2866 // collection. Make them no longer GC alloc regions. | |
2867 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
2868 HeapRegion* r = _gc_alloc_regions[ap]; | |
2869 if (r != NULL && r->is_empty()) { | |
2870 { | |
2871 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
2872 r->set_zero_fill_complete(); | |
2873 put_free_region_on_list_locked(r); | |
2874 } | |
2875 } | |
2876 // set_gc_alloc_region will also NULLify all aliases to the region | |
2877 set_gc_alloc_region(ap, NULL); | |
2878 _gc_alloc_region_counts[ap] = 0; | |
2879 } | |
2880 } | |
2881 | |
2882 void G1CollectedHeap::init_for_evac_failure(OopsInHeapRegionClosure* cl) { | |
2883 _drain_in_progress = false; | |
2884 set_evac_failure_closure(cl); | |
2885 _evac_failure_scan_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
2886 } | |
2887 | |
2888 void G1CollectedHeap::finalize_for_evac_failure() { | |
2889 assert(_evac_failure_scan_stack != NULL && | |
2890 _evac_failure_scan_stack->length() == 0, | |
2891 "Postcondition"); | |
2892 assert(!_drain_in_progress, "Postcondition"); | |
2893 // Don't have to delete, since the scan stack is a resource object. | |
2894 _evac_failure_scan_stack = NULL; | |
2895 } | |
2896 | |
2897 | |
2898 | |
2899 // *** Sequential G1 Evacuation | |
2900 | |
2901 HeapWord* G1CollectedHeap::allocate_during_gc(GCAllocPurpose purpose, size_t word_size) { | |
2902 HeapRegion* alloc_region = _gc_alloc_regions[purpose]; | |
2903 // let the caller handle alloc failure | |
2904 if (alloc_region == NULL) return NULL; | |
2905 assert(isHumongous(word_size) || !alloc_region->isHumongous(), | |
2906 "Either the object is humongous or the region isn't"); | |
2907 HeapWord* block = alloc_region->allocate(word_size); | |
2908 if (block == NULL) { | |
2909 block = allocate_during_gc_slow(purpose, alloc_region, false, word_size); | |
2910 } | |
2911 return block; | |
2912 } | |
2913 | |
2914 class G1IsAliveClosure: public BoolObjectClosure { | |
2915 G1CollectedHeap* _g1; | |
2916 public: | |
2917 G1IsAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
2918 void do_object(oop p) { assert(false, "Do not call."); } | |
2919 bool do_object_b(oop p) { | |
2920 // It is reachable if it is outside the collection set, or is inside | |
2921 // and forwarded. | |
2922 | |
2923 #ifdef G1_DEBUG | |
2924 gclog_or_tty->print_cr("is alive "PTR_FORMAT" in CS %d forwarded %d overall %d", | |
2925 (void*) p, _g1->obj_in_cs(p), p->is_forwarded(), | |
2926 !_g1->obj_in_cs(p) || p->is_forwarded()); | |
2927 #endif // G1_DEBUG | |
2928 | |
2929 return !_g1->obj_in_cs(p) || p->is_forwarded(); | |
2930 } | |
2931 }; | |
2932 | |
2933 class G1KeepAliveClosure: public OopClosure { | |
2934 G1CollectedHeap* _g1; | |
2935 public: | |
2936 G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
2937 void do_oop(narrowOop* p) { | |
2938 guarantee(false, "NYI"); | |
2939 } | |
2940 void do_oop(oop* p) { | |
2941 oop obj = *p; | |
2942 #ifdef G1_DEBUG | |
2943 if (PrintGC && Verbose) { | |
2944 gclog_or_tty->print_cr("keep alive *"PTR_FORMAT" = "PTR_FORMAT" "PTR_FORMAT, | |
2945 p, (void*) obj, (void*) *p); | |
2946 } | |
2947 #endif // G1_DEBUG | |
2948 | |
2949 if (_g1->obj_in_cs(obj)) { | |
2950 assert( obj->is_forwarded(), "invariant" ); | |
2951 *p = obj->forwardee(); | |
2952 | |
2953 #ifdef G1_DEBUG | |
2954 gclog_or_tty->print_cr(" in CSet: moved "PTR_FORMAT" -> "PTR_FORMAT, | |
2955 (void*) obj, (void*) *p); | |
2956 #endif // G1_DEBUG | |
2957 } | |
2958 } | |
2959 }; | |
2960 | |
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2961 class UpdateRSetImmediate : public OopsInHeapRegionClosure { |
342 | 2962 private: |
2963 G1CollectedHeap* _g1; | |
2964 G1RemSet* _g1_rem_set; | |
2965 public: | |
616
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2966 UpdateRSetImmediate(G1CollectedHeap* g1) : |
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2967 _g1(g1), _g1_rem_set(g1->g1_rem_set()) {} |
342 | 2968 |
2969 void do_oop(narrowOop* p) { | |
2970 guarantee(false, "NYI"); | |
2971 } | |
2972 void do_oop(oop* p) { | |
2973 assert(_from->is_in_reserved(p), "paranoia"); | |
616
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2974 if (*p != NULL && !_from->is_survivor()) { |
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2975 _g1_rem_set->par_write_ref(_from, p, 0); |
342 | 2976 } |
2977 } | |
2978 }; | |
2979 | |
616
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2980 class UpdateRSetDeferred : public OopsInHeapRegionClosure { |
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2981 private: |
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2982 G1CollectedHeap* _g1; |
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2983 DirtyCardQueue *_dcq; |
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2984 CardTableModRefBS* _ct_bs; |
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2985 |
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2986 public: |
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2987 UpdateRSetDeferred(G1CollectedHeap* g1, DirtyCardQueue* dcq) : |
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2988 _g1(g1), _ct_bs((CardTableModRefBS*)_g1->barrier_set()), _dcq(dcq) {} |
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2989 |
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2990 void do_oop(narrowOop* p) { |
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2991 guarantee(false, "NYI"); |
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2992 } |
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2993 void do_oop(oop* p) { |
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2994 assert(_from->is_in_reserved(p), "paranoia"); |
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2995 if (!_from->is_in_reserved(*p) && !_from->is_survivor()) { |
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2996 size_t card_index = _ct_bs->index_for(p); |
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2997 if (_ct_bs->mark_card_deferred(card_index)) { |
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2998 _dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index)); |
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2999 } |
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3000 } |
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3001 } |
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3002 }; |
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3003 |
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3004 |
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3005 |
342 | 3006 class RemoveSelfPointerClosure: public ObjectClosure { |
3007 private: | |
3008 G1CollectedHeap* _g1; | |
3009 ConcurrentMark* _cm; | |
3010 HeapRegion* _hr; | |
3011 size_t _prev_marked_bytes; | |
3012 size_t _next_marked_bytes; | |
616
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3013 OopsInHeapRegionClosure *_cl; |
342 | 3014 public: |
616
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3015 RemoveSelfPointerClosure(G1CollectedHeap* g1, OopsInHeapRegionClosure* cl) : |
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3016 _g1(g1), _cm(_g1->concurrent_mark()), _prev_marked_bytes(0), |
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3017 _next_marked_bytes(0), _cl(cl) {} |
342 | 3018 |
3019 size_t prev_marked_bytes() { return _prev_marked_bytes; } | |
3020 size_t next_marked_bytes() { return _next_marked_bytes; } | |
3021 | |
352
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3022 // The original idea here was to coalesce evacuated and dead objects. |
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3023 // However that caused complications with the block offset table (BOT). |
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3024 // In particular if there were two TLABs, one of them partially refined. |
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3025 // |----- TLAB_1--------|----TLAB_2-~~~(partially refined part)~~~| |
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3026 // The BOT entries of the unrefined part of TLAB_2 point to the start |
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3027 // of TLAB_2. If the last object of the TLAB_1 and the first object |
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3028 // of TLAB_2 are coalesced, then the cards of the unrefined part |
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3029 // would point into middle of the filler object. |
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3030 // |
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3031 // The current approach is to not coalesce and leave the BOT contents intact. |
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3032 void do_object(oop obj) { |
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3033 if (obj->is_forwarded() && obj->forwardee() == obj) { |
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3034 // The object failed to move. |
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3035 assert(!_g1->is_obj_dead(obj), "We should not be preserving dead objs."); |
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3036 _cm->markPrev(obj); |
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3037 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
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3038 _prev_marked_bytes += (obj->size() * HeapWordSize); |
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3039 if (_g1->mark_in_progress() && !_g1->is_obj_ill(obj)) { |
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3040 _cm->markAndGrayObjectIfNecessary(obj); |
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3041 } |
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3042 obj->set_mark(markOopDesc::prototype()); |
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3043 // While we were processing RSet buffers during the |
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3044 // collection, we actually didn't scan any cards on the |
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3045 // collection set, since we didn't want to update remebered |
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3046 // sets with entries that point into the collection set, given |
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3047 // that live objects fromthe collection set are about to move |
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3048 // and such entries will be stale very soon. This change also |
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3049 // dealt with a reliability issue which involved scanning a |
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3050 // card in the collection set and coming across an array that |
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3051 // was being chunked and looking malformed. The problem is |
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3052 // that, if evacuation fails, we might have remembered set |
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3053 // entries missing given that we skipped cards on the |
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3054 // collection set. So, we'll recreate such entries now. |
616
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3055 obj->oop_iterate(_cl); |
352
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3056 assert(_cm->isPrevMarked(obj), "Should be marked!"); |
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3057 } else { |
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3058 // The object has been either evacuated or is dead. Fill it with a |
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3059 // dummy object. |
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3060 MemRegion mr((HeapWord*)obj, obj->size()); |
481
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3061 CollectedHeap::fill_with_object(mr); |
342 | 3062 _cm->clearRangeBothMaps(mr); |
3063 } | |
3064 } | |
3065 }; | |
3066 | |
3067 void G1CollectedHeap::remove_self_forwarding_pointers() { | |
616
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3068 UpdateRSetImmediate immediate_update(_g1h); |
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3069 DirtyCardQueue dcq(&_g1h->dirty_card_queue_set()); |
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3070 UpdateRSetDeferred deferred_update(_g1h, &dcq); |
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3071 OopsInHeapRegionClosure *cl; |
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3072 if (G1DeferredRSUpdate) { |
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3073 cl = &deferred_update; |
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3074 } else { |
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3075 cl = &immediate_update; |
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3076 } |
342 | 3077 HeapRegion* cur = g1_policy()->collection_set(); |
3078 while (cur != NULL) { | |
3079 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
3080 | |
616
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3081 RemoveSelfPointerClosure rspc(_g1h, cl); |
342 | 3082 if (cur->evacuation_failed()) { |
3083 assert(cur->in_collection_set(), "bad CS"); | |
616
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3084 cl->set_region(cur); |
342 | 3085 cur->object_iterate(&rspc); |
3086 | |
3087 // A number of manipulations to make the TAMS be the current top, | |
3088 // and the marked bytes be the ones observed in the iteration. | |
3089 if (_g1h->concurrent_mark()->at_least_one_mark_complete()) { | |
3090 // The comments below are the postconditions achieved by the | |
3091 // calls. Note especially the last such condition, which says that | |
3092 // the count of marked bytes has been properly restored. | |
3093 cur->note_start_of_marking(false); | |
3094 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
3095 cur->add_to_marked_bytes(rspc.prev_marked_bytes()); | |
3096 // _next_marked_bytes == prev_marked_bytes. | |
3097 cur->note_end_of_marking(); | |
3098 // _prev_top_at_mark_start == top(), | |
3099 // _prev_marked_bytes == prev_marked_bytes | |
3100 } | |
3101 // If there is no mark in progress, we modified the _next variables | |
3102 // above needlessly, but harmlessly. | |
3103 if (_g1h->mark_in_progress()) { | |
3104 cur->note_start_of_marking(false); | |
3105 // _next_top_at_mark_start == top, _next_marked_bytes == 0 | |
3106 // _next_marked_bytes == next_marked_bytes. | |
3107 } | |
3108 | |
3109 // Now make sure the region has the right index in the sorted array. | |
3110 g1_policy()->note_change_in_marked_bytes(cur); | |
3111 } | |
3112 cur = cur->next_in_collection_set(); | |
3113 } | |
3114 assert(g1_policy()->assertMarkedBytesDataOK(), "Should be!"); | |
3115 | |
3116 // Now restore saved marks, if any. | |
3117 if (_objs_with_preserved_marks != NULL) { | |
3118 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
3119 assert(_objs_with_preserved_marks->length() == | |
3120 _preserved_marks_of_objs->length(), "Both or none."); | |
3121 guarantee(_objs_with_preserved_marks->length() == | |
3122 _preserved_marks_of_objs->length(), "Both or none."); | |
3123 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
3124 oop obj = _objs_with_preserved_marks->at(i); | |
3125 markOop m = _preserved_marks_of_objs->at(i); | |
3126 obj->set_mark(m); | |
3127 } | |
3128 // Delete the preserved marks growable arrays (allocated on the C heap). | |
3129 delete _objs_with_preserved_marks; | |
3130 delete _preserved_marks_of_objs; | |
3131 _objs_with_preserved_marks = NULL; | |
3132 _preserved_marks_of_objs = NULL; | |
3133 } | |
3134 } | |
3135 | |
3136 void G1CollectedHeap::push_on_evac_failure_scan_stack(oop obj) { | |
3137 _evac_failure_scan_stack->push(obj); | |
3138 } | |
3139 | |
3140 void G1CollectedHeap::drain_evac_failure_scan_stack() { | |
3141 assert(_evac_failure_scan_stack != NULL, "precondition"); | |
3142 | |
3143 while (_evac_failure_scan_stack->length() > 0) { | |
3144 oop obj = _evac_failure_scan_stack->pop(); | |
3145 _evac_failure_closure->set_region(heap_region_containing(obj)); | |
3146 obj->oop_iterate_backwards(_evac_failure_closure); | |
3147 } | |
3148 } | |
3149 | |
3150 void G1CollectedHeap::handle_evacuation_failure(oop old) { | |
3151 markOop m = old->mark(); | |
3152 // forward to self | |
3153 assert(!old->is_forwarded(), "precondition"); | |
3154 | |
3155 old->forward_to(old); | |
3156 handle_evacuation_failure_common(old, m); | |
3157 } | |
3158 | |
3159 oop | |
3160 G1CollectedHeap::handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, | |
3161 oop old) { | |
3162 markOop m = old->mark(); | |
3163 oop forward_ptr = old->forward_to_atomic(old); | |
3164 if (forward_ptr == NULL) { | |
3165 // Forward-to-self succeeded. | |
3166 if (_evac_failure_closure != cl) { | |
3167 MutexLockerEx x(EvacFailureStack_lock, Mutex::_no_safepoint_check_flag); | |
3168 assert(!_drain_in_progress, | |
3169 "Should only be true while someone holds the lock."); | |
3170 // Set the global evac-failure closure to the current thread's. | |
3171 assert(_evac_failure_closure == NULL, "Or locking has failed."); | |
3172 set_evac_failure_closure(cl); | |
3173 // Now do the common part. | |
3174 handle_evacuation_failure_common(old, m); | |
3175 // Reset to NULL. | |
3176 set_evac_failure_closure(NULL); | |
3177 } else { | |
3178 // The lock is already held, and this is recursive. | |
3179 assert(_drain_in_progress, "This should only be the recursive case."); | |
3180 handle_evacuation_failure_common(old, m); | |
3181 } | |
3182 return old; | |
3183 } else { | |
3184 // Someone else had a place to copy it. | |
3185 return forward_ptr; | |
3186 } | |
3187 } | |
3188 | |
3189 void G1CollectedHeap::handle_evacuation_failure_common(oop old, markOop m) { | |
3190 set_evacuation_failed(true); | |
3191 | |
3192 preserve_mark_if_necessary(old, m); | |
3193 | |
3194 HeapRegion* r = heap_region_containing(old); | |
3195 if (!r->evacuation_failed()) { | |
3196 r->set_evacuation_failed(true); | |
3197 if (G1TraceRegions) { | |
3198 gclog_or_tty->print("evacuation failed in heap region "PTR_FORMAT" " | |
3199 "["PTR_FORMAT","PTR_FORMAT")\n", | |
3200 r, r->bottom(), r->end()); | |
3201 } | |
3202 } | |
3203 | |
3204 push_on_evac_failure_scan_stack(old); | |
3205 | |
3206 if (!_drain_in_progress) { | |
3207 // prevent recursion in copy_to_survivor_space() | |
3208 _drain_in_progress = true; | |
3209 drain_evac_failure_scan_stack(); | |
3210 _drain_in_progress = false; | |
3211 } | |
3212 } | |
3213 | |
3214 void G1CollectedHeap::preserve_mark_if_necessary(oop obj, markOop m) { | |
3215 if (m != markOopDesc::prototype()) { | |
3216 if (_objs_with_preserved_marks == NULL) { | |
3217 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
3218 _objs_with_preserved_marks = | |
3219 new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
3220 _preserved_marks_of_objs = | |
3221 new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
3222 } | |
3223 _objs_with_preserved_marks->push(obj); | |
3224 _preserved_marks_of_objs->push(m); | |
3225 } | |
3226 } | |
3227 | |
3228 // *** Parallel G1 Evacuation | |
3229 | |
3230 HeapWord* G1CollectedHeap::par_allocate_during_gc(GCAllocPurpose purpose, | |
3231 size_t word_size) { | |
3232 HeapRegion* alloc_region = _gc_alloc_regions[purpose]; | |
3233 // let the caller handle alloc failure | |
3234 if (alloc_region == NULL) return NULL; | |
3235 | |
3236 HeapWord* block = alloc_region->par_allocate(word_size); | |
3237 if (block == NULL) { | |
3238 MutexLockerEx x(par_alloc_during_gc_lock(), | |
3239 Mutex::_no_safepoint_check_flag); | |
3240 block = allocate_during_gc_slow(purpose, alloc_region, true, word_size); | |
3241 } | |
3242 return block; | |
3243 } | |
3244 | |
545 | 3245 void G1CollectedHeap::retire_alloc_region(HeapRegion* alloc_region, |
3246 bool par) { | |
3247 // Another thread might have obtained alloc_region for the given | |
3248 // purpose, and might be attempting to allocate in it, and might | |
3249 // succeed. Therefore, we can't do the "finalization" stuff on the | |
3250 // region below until we're sure the last allocation has happened. | |
3251 // We ensure this by allocating the remaining space with a garbage | |
3252 // object. | |
3253 if (par) par_allocate_remaining_space(alloc_region); | |
3254 // Now we can do the post-GC stuff on the region. | |
3255 alloc_region->note_end_of_copying(); | |
3256 g1_policy()->record_after_bytes(alloc_region->used()); | |
3257 } | |
3258 | |
342 | 3259 HeapWord* |
3260 G1CollectedHeap::allocate_during_gc_slow(GCAllocPurpose purpose, | |
3261 HeapRegion* alloc_region, | |
3262 bool par, | |
3263 size_t word_size) { | |
3264 HeapWord* block = NULL; | |
3265 // In the parallel case, a previous thread to obtain the lock may have | |
3266 // already assigned a new gc_alloc_region. | |
3267 if (alloc_region != _gc_alloc_regions[purpose]) { | |
3268 assert(par, "But should only happen in parallel case."); | |
3269 alloc_region = _gc_alloc_regions[purpose]; | |
3270 if (alloc_region == NULL) return NULL; | |
3271 block = alloc_region->par_allocate(word_size); | |
3272 if (block != NULL) return block; | |
3273 // Otherwise, continue; this new region is empty, too. | |
3274 } | |
3275 assert(alloc_region != NULL, "We better have an allocation region"); | |
545 | 3276 retire_alloc_region(alloc_region, par); |
342 | 3277 |
3278 if (_gc_alloc_region_counts[purpose] >= g1_policy()->max_regions(purpose)) { | |
3279 // Cannot allocate more regions for the given purpose. | |
3280 GCAllocPurpose alt_purpose = g1_policy()->alternative_purpose(purpose); | |
3281 // Is there an alternative? | |
3282 if (purpose != alt_purpose) { | |
3283 HeapRegion* alt_region = _gc_alloc_regions[alt_purpose]; | |
3284 // Has not the alternative region been aliased? | |
545 | 3285 if (alloc_region != alt_region && alt_region != NULL) { |
342 | 3286 // Try to allocate in the alternative region. |
3287 if (par) { | |
3288 block = alt_region->par_allocate(word_size); | |
3289 } else { | |
3290 block = alt_region->allocate(word_size); | |
3291 } | |
3292 // Make an alias. | |
3293 _gc_alloc_regions[purpose] = _gc_alloc_regions[alt_purpose]; | |
545 | 3294 if (block != NULL) { |
3295 return block; | |
3296 } | |
3297 retire_alloc_region(alt_region, par); | |
342 | 3298 } |
3299 // Both the allocation region and the alternative one are full | |
3300 // and aliased, replace them with a new allocation region. | |
3301 purpose = alt_purpose; | |
3302 } else { | |
3303 set_gc_alloc_region(purpose, NULL); | |
3304 return NULL; | |
3305 } | |
3306 } | |
3307 | |
3308 // Now allocate a new region for allocation. | |
3309 alloc_region = newAllocRegionWithExpansion(purpose, word_size, false /*zero_filled*/); | |
3310 | |
3311 // let the caller handle alloc failure | |
3312 if (alloc_region != NULL) { | |
3313 | |
3314 assert(check_gc_alloc_regions(), "alloc regions messed up"); | |
3315 assert(alloc_region->saved_mark_at_top(), | |
3316 "Mark should have been saved already."); | |
3317 // We used to assert that the region was zero-filled here, but no | |
3318 // longer. | |
3319 | |
3320 // This must be done last: once it's installed, other regions may | |
3321 // allocate in it (without holding the lock.) | |
3322 set_gc_alloc_region(purpose, alloc_region); | |
3323 | |
3324 if (par) { | |
3325 block = alloc_region->par_allocate(word_size); | |
3326 } else { | |
3327 block = alloc_region->allocate(word_size); | |
3328 } | |
3329 // Caller handles alloc failure. | |
3330 } else { | |
3331 // This sets other apis using the same old alloc region to NULL, also. | |
3332 set_gc_alloc_region(purpose, NULL); | |
3333 } | |
3334 return block; // May be NULL. | |
3335 } | |
3336 | |
3337 void G1CollectedHeap::par_allocate_remaining_space(HeapRegion* r) { | |
3338 HeapWord* block = NULL; | |
3339 size_t free_words; | |
3340 do { | |
3341 free_words = r->free()/HeapWordSize; | |
3342 // If there's too little space, no one can allocate, so we're done. | |
3343 if (free_words < (size_t)oopDesc::header_size()) return; | |
3344 // Otherwise, try to claim it. | |
3345 block = r->par_allocate(free_words); | |
3346 } while (block == NULL); | |
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3347 fill_with_object(block, free_words); |
342 | 3348 } |
3349 | |
3350 #define use_local_bitmaps 1 | |
3351 #define verify_local_bitmaps 0 | |
3352 | |
3353 #ifndef PRODUCT | |
3354 | |
3355 class GCLabBitMap; | |
3356 class GCLabBitMapClosure: public BitMapClosure { | |
3357 private: | |
3358 ConcurrentMark* _cm; | |
3359 GCLabBitMap* _bitmap; | |
3360 | |
3361 public: | |
3362 GCLabBitMapClosure(ConcurrentMark* cm, | |
3363 GCLabBitMap* bitmap) { | |
3364 _cm = cm; | |
3365 _bitmap = bitmap; | |
3366 } | |
3367 | |
3368 virtual bool do_bit(size_t offset); | |
3369 }; | |
3370 | |
3371 #endif // PRODUCT | |
3372 | |
3373 #define oop_buffer_length 256 | |
3374 | |
3375 class GCLabBitMap: public BitMap { | |
3376 private: | |
3377 ConcurrentMark* _cm; | |
3378 | |
3379 int _shifter; | |
3380 size_t _bitmap_word_covers_words; | |
3381 | |
3382 // beginning of the heap | |
3383 HeapWord* _heap_start; | |
3384 | |
3385 // this is the actual start of the GCLab | |
3386 HeapWord* _real_start_word; | |
3387 | |
3388 // this is the actual end of the GCLab | |
3389 HeapWord* _real_end_word; | |
3390 | |
3391 // this is the first word, possibly located before the actual start | |
3392 // of the GCLab, that corresponds to the first bit of the bitmap | |
3393 HeapWord* _start_word; | |
3394 | |
3395 // size of a GCLab in words | |
3396 size_t _gclab_word_size; | |
3397 | |
3398 static int shifter() { | |
3399 return MinObjAlignment - 1; | |
3400 } | |
3401 | |
3402 // how many heap words does a single bitmap word corresponds to? | |
3403 static size_t bitmap_word_covers_words() { | |
3404 return BitsPerWord << shifter(); | |
3405 } | |
3406 | |
3407 static size_t gclab_word_size() { | |
3408 return ParallelGCG1AllocBufferSize / HeapWordSize; | |
3409 } | |
3410 | |
3411 static size_t bitmap_size_in_bits() { | |
3412 size_t bits_in_bitmap = gclab_word_size() >> shifter(); | |
3413 // We are going to ensure that the beginning of a word in this | |
3414 // bitmap also corresponds to the beginning of a word in the | |
3415 // global marking bitmap. To handle the case where a GCLab | |
3416 // starts from the middle of the bitmap, we need to add enough | |
3417 // space (i.e. up to a bitmap word) to ensure that we have | |
3418 // enough bits in the bitmap. | |
3419 return bits_in_bitmap + BitsPerWord - 1; | |
3420 } | |
3421 public: | |
3422 GCLabBitMap(HeapWord* heap_start) | |
3423 : BitMap(bitmap_size_in_bits()), | |
3424 _cm(G1CollectedHeap::heap()->concurrent_mark()), | |
3425 _shifter(shifter()), | |
3426 _bitmap_word_covers_words(bitmap_word_covers_words()), | |
3427 _heap_start(heap_start), | |
3428 _gclab_word_size(gclab_word_size()), | |
3429 _real_start_word(NULL), | |
3430 _real_end_word(NULL), | |
3431 _start_word(NULL) | |
3432 { | |
3433 guarantee( size_in_words() >= bitmap_size_in_words(), | |
3434 "just making sure"); | |
3435 } | |
3436 | |
3437 inline unsigned heapWordToOffset(HeapWord* addr) { | |
3438 unsigned offset = (unsigned) pointer_delta(addr, _start_word) >> _shifter; | |
3439 assert(offset < size(), "offset should be within bounds"); | |
3440 return offset; | |
3441 } | |
3442 | |
3443 inline HeapWord* offsetToHeapWord(size_t offset) { | |
3444 HeapWord* addr = _start_word + (offset << _shifter); | |
3445 assert(_real_start_word <= addr && addr < _real_end_word, "invariant"); | |
3446 return addr; | |
3447 } | |
3448 | |
3449 bool fields_well_formed() { | |
3450 bool ret1 = (_real_start_word == NULL) && | |
3451 (_real_end_word == NULL) && | |
3452 (_start_word == NULL); | |
3453 if (ret1) | |
3454 return true; | |
3455 | |
3456 bool ret2 = _real_start_word >= _start_word && | |
3457 _start_word < _real_end_word && | |
3458 (_real_start_word + _gclab_word_size) == _real_end_word && | |
3459 (_start_word + _gclab_word_size + _bitmap_word_covers_words) | |
3460 > _real_end_word; | |
3461 return ret2; | |
3462 } | |
3463 | |
3464 inline bool mark(HeapWord* addr) { | |
3465 guarantee(use_local_bitmaps, "invariant"); | |
3466 assert(fields_well_formed(), "invariant"); | |
3467 | |
3468 if (addr >= _real_start_word && addr < _real_end_word) { | |
3469 assert(!isMarked(addr), "should not have already been marked"); | |
3470 | |
3471 // first mark it on the bitmap | |
3472 at_put(heapWordToOffset(addr), true); | |
3473 | |
3474 return true; | |
3475 } else { | |
3476 return false; | |
3477 } | |
3478 } | |
3479 | |
3480 inline bool isMarked(HeapWord* addr) { | |
3481 guarantee(use_local_bitmaps, "invariant"); | |
3482 assert(fields_well_formed(), "invariant"); | |
3483 | |
3484 return at(heapWordToOffset(addr)); | |
3485 } | |
3486 | |
3487 void set_buffer(HeapWord* start) { | |
3488 guarantee(use_local_bitmaps, "invariant"); | |
3489 clear(); | |
3490 | |
3491 assert(start != NULL, "invariant"); | |
3492 _real_start_word = start; | |
3493 _real_end_word = start + _gclab_word_size; | |
3494 | |
3495 size_t diff = | |
3496 pointer_delta(start, _heap_start) % _bitmap_word_covers_words; | |
3497 _start_word = start - diff; | |
3498 | |
3499 assert(fields_well_formed(), "invariant"); | |
3500 } | |
3501 | |
3502 #ifndef PRODUCT | |
3503 void verify() { | |
3504 // verify that the marks have been propagated | |
3505 GCLabBitMapClosure cl(_cm, this); | |
3506 iterate(&cl); | |
3507 } | |
3508 #endif // PRODUCT | |
3509 | |
3510 void retire() { | |
3511 guarantee(use_local_bitmaps, "invariant"); | |
3512 assert(fields_well_formed(), "invariant"); | |
3513 | |
3514 if (_start_word != NULL) { | |
3515 CMBitMap* mark_bitmap = _cm->nextMarkBitMap(); | |
3516 | |
3517 // this means that the bitmap was set up for the GCLab | |
3518 assert(_real_start_word != NULL && _real_end_word != NULL, "invariant"); | |
3519 | |
3520 mark_bitmap->mostly_disjoint_range_union(this, | |
3521 0, // always start from the start of the bitmap | |
3522 _start_word, | |
3523 size_in_words()); | |
3524 _cm->grayRegionIfNecessary(MemRegion(_real_start_word, _real_end_word)); | |
3525 | |
3526 #ifndef PRODUCT | |
3527 if (use_local_bitmaps && verify_local_bitmaps) | |
3528 verify(); | |
3529 #endif // PRODUCT | |
3530 } else { | |
3531 assert(_real_start_word == NULL && _real_end_word == NULL, "invariant"); | |
3532 } | |
3533 } | |
3534 | |
3535 static size_t bitmap_size_in_words() { | |
3536 return (bitmap_size_in_bits() + BitsPerWord - 1) / BitsPerWord; | |
3537 } | |
3538 }; | |
3539 | |
3540 #ifndef PRODUCT | |
3541 | |
3542 bool GCLabBitMapClosure::do_bit(size_t offset) { | |
3543 HeapWord* addr = _bitmap->offsetToHeapWord(offset); | |
3544 guarantee(_cm->isMarked(oop(addr)), "it should be!"); | |
3545 return true; | |
3546 } | |
3547 | |
3548 #endif // PRODUCT | |
3549 | |
3550 class G1ParGCAllocBuffer: public ParGCAllocBuffer { | |
3551 private: | |
3552 bool _retired; | |
3553 bool _during_marking; | |
3554 GCLabBitMap _bitmap; | |
3555 | |
3556 public: | |
3557 G1ParGCAllocBuffer() : | |
3558 ParGCAllocBuffer(ParallelGCG1AllocBufferSize / HeapWordSize), | |
3559 _during_marking(G1CollectedHeap::heap()->mark_in_progress()), | |
3560 _bitmap(G1CollectedHeap::heap()->reserved_region().start()), | |
3561 _retired(false) | |
3562 { } | |
3563 | |
3564 inline bool mark(HeapWord* addr) { | |
3565 guarantee(use_local_bitmaps, "invariant"); | |
3566 assert(_during_marking, "invariant"); | |
3567 return _bitmap.mark(addr); | |
3568 } | |
3569 | |
3570 inline void set_buf(HeapWord* buf) { | |
3571 if (use_local_bitmaps && _during_marking) | |
3572 _bitmap.set_buffer(buf); | |
3573 ParGCAllocBuffer::set_buf(buf); | |
3574 _retired = false; | |
3575 } | |
3576 | |
3577 inline void retire(bool end_of_gc, bool retain) { | |
3578 if (_retired) | |
3579 return; | |
3580 if (use_local_bitmaps && _during_marking) { | |
3581 _bitmap.retire(); | |
3582 } | |
3583 ParGCAllocBuffer::retire(end_of_gc, retain); | |
3584 _retired = true; | |
3585 } | |
3586 }; | |
3587 | |
3588 | |
3589 class G1ParScanThreadState : public StackObj { | |
3590 protected: | |
3591 G1CollectedHeap* _g1h; | |
3592 RefToScanQueue* _refs; | |
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3593 DirtyCardQueue _dcq; |
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3594 CardTableModRefBS* _ct_bs; |
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3595 G1RemSet* _g1_rem; |
342 | 3596 |
3597 typedef GrowableArray<oop*> OverflowQueue; | |
3598 OverflowQueue* _overflowed_refs; | |
3599 | |
3600 G1ParGCAllocBuffer _alloc_buffers[GCAllocPurposeCount]; | |
545 | 3601 ageTable _age_table; |
342 | 3602 |
3603 size_t _alloc_buffer_waste; | |
3604 size_t _undo_waste; | |
3605 | |
3606 OopsInHeapRegionClosure* _evac_failure_cl; | |
3607 G1ParScanHeapEvacClosure* _evac_cl; | |
3608 G1ParScanPartialArrayClosure* _partial_scan_cl; | |
3609 | |
3610 int _hash_seed; | |
3611 int _queue_num; | |
3612 | |
3613 int _term_attempts; | |
3614 #if G1_DETAILED_STATS | |
3615 int _pushes, _pops, _steals, _steal_attempts; | |
3616 int _overflow_pushes; | |
3617 #endif | |
3618 | |
3619 double _start; | |
3620 double _start_strong_roots; | |
3621 double _strong_roots_time; | |
3622 double _start_term; | |
3623 double _term_time; | |
3624 | |
3625 // Map from young-age-index (0 == not young, 1 is youngest) to | |
3626 // surviving words. base is what we get back from the malloc call | |
3627 size_t* _surviving_young_words_base; | |
3628 // this points into the array, as we use the first few entries for padding | |
3629 size_t* _surviving_young_words; | |
3630 | |
3631 #define PADDING_ELEM_NUM (64 / sizeof(size_t)) | |
3632 | |
3633 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; } | |
3634 | |
3635 void add_to_undo_waste(size_t waste) { _undo_waste += waste; } | |
3636 | |
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3637 DirtyCardQueue& dirty_card_queue() { return _dcq; } |
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3638 CardTableModRefBS* ctbs() { return _ct_bs; } |
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3639 |
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3640 void immediate_rs_update(HeapRegion* from, oop* p, int tid) { |
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3641 _g1_rem->par_write_ref(from, p, tid); |
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3642 } |
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3643 |
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3644 void deferred_rs_update(HeapRegion* from, oop* p, int tid) { |
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3645 // If the new value of the field points to the same region or |
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3646 // is the to-space, we don't need to include it in the Rset updates. |
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3647 if (!from->is_in_reserved(*p) && !from->is_survivor()) { |
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3648 size_t card_index = ctbs()->index_for(p); |
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3649 // If the card hasn't been added to the buffer, do it. |
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3650 if (ctbs()->mark_card_deferred(card_index)) { |
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3651 dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index)); |
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3652 } |
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3653 } |
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3654 } |
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3655 |
342 | 3656 public: |
3657 G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num) | |
3658 : _g1h(g1h), | |
3659 _refs(g1h->task_queue(queue_num)), | |
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3660 _dcq(&g1h->dirty_card_queue_set()), |
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3661 _ct_bs((CardTableModRefBS*)_g1h->barrier_set()), |
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3662 _g1_rem(g1h->g1_rem_set()), |
342 | 3663 _hash_seed(17), _queue_num(queue_num), |
3664 _term_attempts(0), | |
545 | 3665 _age_table(false), |
342 | 3666 #if G1_DETAILED_STATS |
3667 _pushes(0), _pops(0), _steals(0), | |
3668 _steal_attempts(0), _overflow_pushes(0), | |
3669 #endif | |
3670 _strong_roots_time(0), _term_time(0), | |
3671 _alloc_buffer_waste(0), _undo_waste(0) | |
3672 { | |
3673 // we allocate G1YoungSurvRateNumRegions plus one entries, since | |
3674 // we "sacrifice" entry 0 to keep track of surviving bytes for | |
3675 // non-young regions (where the age is -1) | |
3676 // We also add a few elements at the beginning and at the end in | |
3677 // an attempt to eliminate cache contention | |
3678 size_t real_length = 1 + _g1h->g1_policy()->young_cset_length(); | |
3679 size_t array_length = PADDING_ELEM_NUM + | |
3680 real_length + | |
3681 PADDING_ELEM_NUM; | |
3682 _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length); | |
3683 if (_surviving_young_words_base == NULL) | |
3684 vm_exit_out_of_memory(array_length * sizeof(size_t), | |
3685 "Not enough space for young surv histo."); | |
3686 _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM; | |
3687 memset(_surviving_young_words, 0, real_length * sizeof(size_t)); | |
3688 | |
3689 _overflowed_refs = new OverflowQueue(10); | |
3690 | |
3691 _start = os::elapsedTime(); | |
3692 } | |
3693 | |
3694 ~G1ParScanThreadState() { | |
3695 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base); | |
3696 } | |
3697 | |
3698 RefToScanQueue* refs() { return _refs; } | |
3699 OverflowQueue* overflowed_refs() { return _overflowed_refs; } | |
545 | 3700 ageTable* age_table() { return &_age_table; } |
3701 | |
3702 G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose) { | |
342 | 3703 return &_alloc_buffers[purpose]; |
3704 } | |
3705 | |
3706 size_t alloc_buffer_waste() { return _alloc_buffer_waste; } | |
3707 size_t undo_waste() { return _undo_waste; } | |
3708 | |
3709 void push_on_queue(oop* ref) { | |
526 | 3710 assert(ref != NULL, "invariant"); |
3711 assert(has_partial_array_mask(ref) || _g1h->obj_in_cs(*ref), "invariant"); | |
3712 | |
342 | 3713 if (!refs()->push(ref)) { |
3714 overflowed_refs()->push(ref); | |
3715 IF_G1_DETAILED_STATS(note_overflow_push()); | |
3716 } else { | |
3717 IF_G1_DETAILED_STATS(note_push()); | |
3718 } | |
3719 } | |
3720 | |
3721 void pop_from_queue(oop*& ref) { | |
3722 if (!refs()->pop_local(ref)) { | |
3723 ref = NULL; | |
3724 } else { | |
526 | 3725 assert(ref != NULL, "invariant"); |
3726 assert(has_partial_array_mask(ref) || _g1h->obj_in_cs(*ref), | |
3727 "invariant"); | |
3728 | |
342 | 3729 IF_G1_DETAILED_STATS(note_pop()); |
3730 } | |
3731 } | |
3732 | |
3733 void pop_from_overflow_queue(oop*& ref) { | |
3734 ref = overflowed_refs()->pop(); | |
3735 } | |
3736 | |
3737 int refs_to_scan() { return refs()->size(); } | |
3738 int overflowed_refs_to_scan() { return overflowed_refs()->length(); } | |
3739 | |
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3740 void update_rs(HeapRegion* from, oop* p, int tid) { |
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3741 if (G1DeferredRSUpdate) { |
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3742 deferred_rs_update(from, p, tid); |
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3743 } else { |
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3744 immediate_rs_update(from, p, tid); |
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3745 } |
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3746 } |
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3747 |
342 | 3748 HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) { |
3749 | |
3750 HeapWord* obj = NULL; | |
3751 if (word_sz * 100 < | |
3752 (size_t)(ParallelGCG1AllocBufferSize / HeapWordSize) * | |
3753 ParallelGCBufferWastePct) { | |
3754 G1ParGCAllocBuffer* alloc_buf = alloc_buffer(purpose); | |
3755 add_to_alloc_buffer_waste(alloc_buf->words_remaining()); | |
3756 alloc_buf->retire(false, false); | |
3757 | |
3758 HeapWord* buf = | |
3759 _g1h->par_allocate_during_gc(purpose, ParallelGCG1AllocBufferSize / HeapWordSize); | |
3760 if (buf == NULL) return NULL; // Let caller handle allocation failure. | |
3761 // Otherwise. | |
3762 alloc_buf->set_buf(buf); | |
3763 | |
3764 obj = alloc_buf->allocate(word_sz); | |
3765 assert(obj != NULL, "buffer was definitely big enough..."); | |
526 | 3766 } else { |
342 | 3767 obj = _g1h->par_allocate_during_gc(purpose, word_sz); |
3768 } | |
3769 return obj; | |
3770 } | |
3771 | |
3772 HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) { | |
3773 HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz); | |
3774 if (obj != NULL) return obj; | |
3775 return allocate_slow(purpose, word_sz); | |
3776 } | |
3777 | |
3778 void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) { | |
3779 if (alloc_buffer(purpose)->contains(obj)) { | |
3780 guarantee(alloc_buffer(purpose)->contains(obj + word_sz - 1), | |
3781 "should contain whole object"); | |
3782 alloc_buffer(purpose)->undo_allocation(obj, word_sz); | |
481
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3783 } else { |
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3784 CollectedHeap::fill_with_object(obj, word_sz); |
342 | 3785 add_to_undo_waste(word_sz); |
3786 } | |
3787 } | |
3788 | |
3789 void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) { | |
3790 _evac_failure_cl = evac_failure_cl; | |
3791 } | |
3792 OopsInHeapRegionClosure* evac_failure_closure() { | |
3793 return _evac_failure_cl; | |
3794 } | |
3795 | |
3796 void set_evac_closure(G1ParScanHeapEvacClosure* evac_cl) { | |
3797 _evac_cl = evac_cl; | |
3798 } | |
3799 | |
3800 void set_partial_scan_closure(G1ParScanPartialArrayClosure* partial_scan_cl) { | |
3801 _partial_scan_cl = partial_scan_cl; | |
3802 } | |
3803 | |
3804 int* hash_seed() { return &_hash_seed; } | |
3805 int queue_num() { return _queue_num; } | |
3806 | |
3807 int term_attempts() { return _term_attempts; } | |
3808 void note_term_attempt() { _term_attempts++; } | |
3809 | |
3810 #if G1_DETAILED_STATS | |
3811 int pushes() { return _pushes; } | |
3812 int pops() { return _pops; } | |
3813 int steals() { return _steals; } | |
3814 int steal_attempts() { return _steal_attempts; } | |
3815 int overflow_pushes() { return _overflow_pushes; } | |
3816 | |
3817 void note_push() { _pushes++; } | |
3818 void note_pop() { _pops++; } | |
3819 void note_steal() { _steals++; } | |
3820 void note_steal_attempt() { _steal_attempts++; } | |
3821 void note_overflow_push() { _overflow_pushes++; } | |
3822 #endif | |
3823 | |
3824 void start_strong_roots() { | |
3825 _start_strong_roots = os::elapsedTime(); | |
3826 } | |
3827 void end_strong_roots() { | |
3828 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); | |
3829 } | |
3830 double strong_roots_time() { return _strong_roots_time; } | |
3831 | |
3832 void start_term_time() { | |
3833 note_term_attempt(); | |
3834 _start_term = os::elapsedTime(); | |
3835 } | |
3836 void end_term_time() { | |
3837 _term_time += (os::elapsedTime() - _start_term); | |
3838 } | |
3839 double term_time() { return _term_time; } | |
3840 | |
3841 double elapsed() { | |
3842 return os::elapsedTime() - _start; | |
3843 } | |
3844 | |
3845 size_t* surviving_young_words() { | |
3846 // We add on to hide entry 0 which accumulates surviving words for | |
3847 // age -1 regions (i.e. non-young ones) | |
3848 return _surviving_young_words; | |
3849 } | |
3850 | |
3851 void retire_alloc_buffers() { | |
3852 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { | |
3853 size_t waste = _alloc_buffers[ap].words_remaining(); | |
3854 add_to_alloc_buffer_waste(waste); | |
3855 _alloc_buffers[ap].retire(true, false); | |
3856 } | |
3857 } | |
3858 | |
526 | 3859 private: |
3860 void deal_with_reference(oop* ref_to_scan) { | |
3861 if (has_partial_array_mask(ref_to_scan)) { | |
3862 _partial_scan_cl->do_oop_nv(ref_to_scan); | |
3863 } else { | |
3864 // Note: we can use "raw" versions of "region_containing" because | |
3865 // "obj_to_scan" is definitely in the heap, and is not in a | |
3866 // humongous region. | |
3867 HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan); | |
3868 _evac_cl->set_region(r); | |
3869 _evac_cl->do_oop_nv(ref_to_scan); | |
3870 } | |
3871 } | |
3872 | |
3873 public: | |
342 | 3874 void trim_queue() { |
526 | 3875 // I've replicated the loop twice, first to drain the overflow |
3876 // queue, second to drain the task queue. This is better than | |
3877 // having a single loop, which checks both conditions and, inside | |
3878 // it, either pops the overflow queue or the task queue, as each | |
3879 // loop is tighter. Also, the decision to drain the overflow queue | |
3880 // first is not arbitrary, as the overflow queue is not visible | |
3881 // to the other workers, whereas the task queue is. So, we want to | |
3882 // drain the "invisible" entries first, while allowing the other | |
3883 // workers to potentially steal the "visible" entries. | |
3884 | |
342 | 3885 while (refs_to_scan() > 0 || overflowed_refs_to_scan() > 0) { |
526 | 3886 while (overflowed_refs_to_scan() > 0) { |
3887 oop *ref_to_scan = NULL; | |
342 | 3888 pop_from_overflow_queue(ref_to_scan); |
526 | 3889 assert(ref_to_scan != NULL, "invariant"); |
3890 // We shouldn't have pushed it on the queue if it was not | |
3891 // pointing into the CSet. | |
3892 assert(ref_to_scan != NULL, "sanity"); | |
3893 assert(has_partial_array_mask(ref_to_scan) || | |
3894 _g1h->obj_in_cs(*ref_to_scan), "sanity"); | |
3895 | |
3896 deal_with_reference(ref_to_scan); | |
342 | 3897 } |
526 | 3898 |
3899 while (refs_to_scan() > 0) { | |
3900 oop *ref_to_scan = NULL; | |
3901 pop_from_queue(ref_to_scan); | |
3902 | |
3903 if (ref_to_scan != NULL) { | |
3904 // We shouldn't have pushed it on the queue if it was not | |
3905 // pointing into the CSet. | |
3906 assert(has_partial_array_mask(ref_to_scan) || | |
3907 _g1h->obj_in_cs(*ref_to_scan), "sanity"); | |
3908 | |
3909 deal_with_reference(ref_to_scan); | |
342 | 3910 } |
3911 } | |
3912 } | |
3913 } | |
3914 }; | |
3915 | |
3916 G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : | |
3917 _g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()), | |
3918 _par_scan_state(par_scan_state) { } | |
3919 | |
3920 // This closure is applied to the fields of the objects that have just been copied. | |
3921 // Should probably be made inline and moved in g1OopClosures.inline.hpp. | |
3922 void G1ParScanClosure::do_oop_nv(oop* p) { | |
3923 oop obj = *p; | |
526 | 3924 |
342 | 3925 if (obj != NULL) { |
526 | 3926 if (_g1->in_cset_fast_test(obj)) { |
3927 // We're not going to even bother checking whether the object is | |
3928 // already forwarded or not, as this usually causes an immediate | |
3929 // stall. We'll try to prefetch the object (for write, given that | |
3930 // we might need to install the forwarding reference) and we'll | |
3931 // get back to it when pop it from the queue | |
3932 Prefetch::write(obj->mark_addr(), 0); | |
3933 Prefetch::read(obj->mark_addr(), (HeapWordSize*2)); | |
3934 | |
3935 // slightly paranoid test; I'm trying to catch potential | |
3936 // problems before we go into push_on_queue to know where the | |
3937 // problem is coming from | |
3938 assert(obj == *p, "the value of *p should not have changed"); | |
3939 _par_scan_state->push_on_queue(p); | |
3940 } else { | |
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3941 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
342 | 3942 } |
3943 } | |
3944 } | |
3945 | |
3946 void G1ParCopyHelper::mark_forwardee(oop* p) { | |
3947 // This is called _after_ do_oop_work has been called, hence after | |
3948 // the object has been relocated to its new location and *p points | |
3949 // to its new location. | |
3950 | |
3951 oop thisOop = *p; | |
3952 if (thisOop != NULL) { | |
3953 assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(thisOop)), | |
3954 "shouldn't still be in the CSet if evacuation didn't fail."); | |
3955 HeapWord* addr = (HeapWord*)thisOop; | |
3956 if (_g1->is_in_g1_reserved(addr)) | |
3957 _cm->grayRoot(oop(addr)); | |
3958 } | |
3959 } | |
3960 | |
3961 oop G1ParCopyHelper::copy_to_survivor_space(oop old) { | |
3962 size_t word_sz = old->size(); | |
3963 HeapRegion* from_region = _g1->heap_region_containing_raw(old); | |
3964 // +1 to make the -1 indexes valid... | |
3965 int young_index = from_region->young_index_in_cset()+1; | |
3966 assert( (from_region->is_young() && young_index > 0) || | |
3967 (!from_region->is_young() && young_index == 0), "invariant" ); | |
3968 G1CollectorPolicy* g1p = _g1->g1_policy(); | |
3969 markOop m = old->mark(); | |
545 | 3970 int age = m->has_displaced_mark_helper() ? m->displaced_mark_helper()->age() |
3971 : m->age(); | |
3972 GCAllocPurpose alloc_purpose = g1p->evacuation_destination(from_region, age, | |
342 | 3973 word_sz); |
3974 HeapWord* obj_ptr = _par_scan_state->allocate(alloc_purpose, word_sz); | |
3975 oop obj = oop(obj_ptr); | |
3976 | |
3977 if (obj_ptr == NULL) { | |
3978 // This will either forward-to-self, or detect that someone else has | |
3979 // installed a forwarding pointer. | |
3980 OopsInHeapRegionClosure* cl = _par_scan_state->evac_failure_closure(); | |
3981 return _g1->handle_evacuation_failure_par(cl, old); | |
3982 } | |
3983 | |
526 | 3984 // We're going to allocate linearly, so might as well prefetch ahead. |
3985 Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes); | |
3986 | |
342 | 3987 oop forward_ptr = old->forward_to_atomic(obj); |
3988 if (forward_ptr == NULL) { | |
3989 Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz); | |
526 | 3990 if (g1p->track_object_age(alloc_purpose)) { |
3991 // We could simply do obj->incr_age(). However, this causes a | |
3992 // performance issue. obj->incr_age() will first check whether | |
3993 // the object has a displaced mark by checking its mark word; | |
3994 // getting the mark word from the new location of the object | |
3995 // stalls. So, given that we already have the mark word and we | |
3996 // are about to install it anyway, it's better to increase the | |
3997 // age on the mark word, when the object does not have a | |
3998 // displaced mark word. We're not expecting many objects to have | |
3999 // a displaced marked word, so that case is not optimized | |
4000 // further (it could be...) and we simply call obj->incr_age(). | |
4001 | |
4002 if (m->has_displaced_mark_helper()) { | |
4003 // in this case, we have to install the mark word first, | |
4004 // otherwise obj looks to be forwarded (the old mark word, | |
4005 // which contains the forward pointer, was copied) | |
4006 obj->set_mark(m); | |
4007 obj->incr_age(); | |
4008 } else { | |
4009 m = m->incr_age(); | |
545 | 4010 obj->set_mark(m); |
526 | 4011 } |
545 | 4012 _par_scan_state->age_table()->add(obj, word_sz); |
4013 } else { | |
4014 obj->set_mark(m); | |
526 | 4015 } |
4016 | |
342 | 4017 // preserve "next" mark bit |
4018 if (_g1->mark_in_progress() && !_g1->is_obj_ill(old)) { | |
4019 if (!use_local_bitmaps || | |
4020 !_par_scan_state->alloc_buffer(alloc_purpose)->mark(obj_ptr)) { | |
4021 // if we couldn't mark it on the local bitmap (this happens when | |
4022 // the object was not allocated in the GCLab), we have to bite | |
4023 // the bullet and do the standard parallel mark | |
4024 _cm->markAndGrayObjectIfNecessary(obj); | |
4025 } | |
4026 #if 1 | |
4027 if (_g1->isMarkedNext(old)) { | |
4028 _cm->nextMarkBitMap()->parClear((HeapWord*)old); | |
4029 } | |
4030 #endif | |
4031 } | |
4032 | |
4033 size_t* surv_young_words = _par_scan_state->surviving_young_words(); | |
4034 surv_young_words[young_index] += word_sz; | |
4035 | |
4036 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) { | |
4037 arrayOop(old)->set_length(0); | |
526 | 4038 _par_scan_state->push_on_queue(set_partial_array_mask(old)); |
342 | 4039 } else { |
526 | 4040 // No point in using the slower heap_region_containing() method, |
4041 // given that we know obj is in the heap. | |
4042 _scanner->set_region(_g1->heap_region_containing_raw(obj)); | |
342 | 4043 obj->oop_iterate_backwards(_scanner); |
4044 } | |
4045 } else { | |
4046 _par_scan_state->undo_allocation(alloc_purpose, obj_ptr, word_sz); | |
4047 obj = forward_ptr; | |
4048 } | |
4049 return obj; | |
4050 } | |
4051 | |
526 | 4052 template<bool do_gen_barrier, G1Barrier barrier, |
4053 bool do_mark_forwardee, bool skip_cset_test> | |
4054 void G1ParCopyClosure<do_gen_barrier, barrier, | |
4055 do_mark_forwardee, skip_cset_test>::do_oop_work(oop* p) { | |
342 | 4056 oop obj = *p; |
4057 assert(barrier != G1BarrierRS || obj != NULL, | |
4058 "Precondition: G1BarrierRS implies obj is nonNull"); | |
4059 | |
526 | 4060 // The only time we skip the cset test is when we're scanning |
4061 // references popped from the queue. And we only push on the queue | |
4062 // references that we know point into the cset, so no point in | |
4063 // checking again. But we'll leave an assert here for peace of mind. | |
4064 assert(!skip_cset_test || _g1->obj_in_cs(obj), "invariant"); | |
4065 | |
4066 // here the null check is implicit in the cset_fast_test() test | |
4067 if (skip_cset_test || _g1->in_cset_fast_test(obj)) { | |
342 | 4068 #if G1_REM_SET_LOGGING |
526 | 4069 gclog_or_tty->print_cr("Loc "PTR_FORMAT" contains pointer "PTR_FORMAT" " |
4070 "into CS.", p, (void*) obj); | |
342 | 4071 #endif |
526 | 4072 if (obj->is_forwarded()) { |
4073 *p = obj->forwardee(); | |
4074 } else { | |
4075 *p = copy_to_survivor_space(obj); | |
342 | 4076 } |
526 | 4077 // When scanning the RS, we only care about objs in CS. |
4078 if (barrier == G1BarrierRS) { | |
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4079 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
342 | 4080 } |
526 | 4081 } |
4082 | |
4083 // When scanning moved objs, must look at all oops. | |
4084 if (barrier == G1BarrierEvac && obj != NULL) { | |
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4085 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); |
526 | 4086 } |
4087 | |
4088 if (do_gen_barrier && obj != NULL) { | |
4089 par_do_barrier(p); | |
4090 } | |
4091 } | |
4092 | |
4093 template void G1ParCopyClosure<false, G1BarrierEvac, false, true>::do_oop_work(oop* p); | |
4094 | |
4095 template<class T> void G1ParScanPartialArrayClosure::process_array_chunk( | |
342 | 4096 oop obj, int start, int end) { |
4097 // process our set of indices (include header in first chunk) | |
4098 assert(start < end, "invariant"); | |
4099 T* const base = (T*)objArrayOop(obj)->base(); | |
526 | 4100 T* const start_addr = (start == 0) ? (T*) obj : base + start; |
342 | 4101 T* const end_addr = base + end; |
4102 MemRegion mr((HeapWord*)start_addr, (HeapWord*)end_addr); | |
4103 _scanner.set_region(_g1->heap_region_containing(obj)); | |
4104 obj->oop_iterate(&_scanner, mr); | |
4105 } | |
4106 | |
4107 void G1ParScanPartialArrayClosure::do_oop_nv(oop* p) { | |
4108 assert(!UseCompressedOops, "Needs to be fixed to work with compressed oops"); | |
526 | 4109 assert(has_partial_array_mask(p), "invariant"); |
4110 oop old = clear_partial_array_mask(p); | |
342 | 4111 assert(old->is_objArray(), "must be obj array"); |
4112 assert(old->is_forwarded(), "must be forwarded"); | |
4113 assert(Universe::heap()->is_in_reserved(old), "must be in heap."); | |
4114 | |
4115 objArrayOop obj = objArrayOop(old->forwardee()); | |
4116 assert((void*)old != (void*)old->forwardee(), "self forwarding here?"); | |
4117 // Process ParGCArrayScanChunk elements now | |
4118 // and push the remainder back onto queue | |
4119 int start = arrayOop(old)->length(); | |
4120 int end = obj->length(); | |
4121 int remainder = end - start; | |
4122 assert(start <= end, "just checking"); | |
4123 if (remainder > 2 * ParGCArrayScanChunk) { | |
4124 // Test above combines last partial chunk with a full chunk | |
4125 end = start + ParGCArrayScanChunk; | |
4126 arrayOop(old)->set_length(end); | |
4127 // Push remainder. | |
526 | 4128 _par_scan_state->push_on_queue(set_partial_array_mask(old)); |
342 | 4129 } else { |
4130 // Restore length so that the heap remains parsable in | |
4131 // case of evacuation failure. | |
4132 arrayOop(old)->set_length(end); | |
4133 } | |
4134 | |
4135 // process our set of indices (include header in first chunk) | |
4136 process_array_chunk<oop>(obj, start, end); | |
4137 } | |
4138 | |
4139 int G1ScanAndBalanceClosure::_nq = 0; | |
4140 | |
4141 class G1ParEvacuateFollowersClosure : public VoidClosure { | |
4142 protected: | |
4143 G1CollectedHeap* _g1h; | |
4144 G1ParScanThreadState* _par_scan_state; | |
4145 RefToScanQueueSet* _queues; | |
4146 ParallelTaskTerminator* _terminator; | |
4147 | |
4148 G1ParScanThreadState* par_scan_state() { return _par_scan_state; } | |
4149 RefToScanQueueSet* queues() { return _queues; } | |
4150 ParallelTaskTerminator* terminator() { return _terminator; } | |
4151 | |
4152 public: | |
4153 G1ParEvacuateFollowersClosure(G1CollectedHeap* g1h, | |
4154 G1ParScanThreadState* par_scan_state, | |
4155 RefToScanQueueSet* queues, | |
4156 ParallelTaskTerminator* terminator) | |
4157 : _g1h(g1h), _par_scan_state(par_scan_state), | |
4158 _queues(queues), _terminator(terminator) {} | |
4159 | |
4160 void do_void() { | |
4161 G1ParScanThreadState* pss = par_scan_state(); | |
4162 while (true) { | |
4163 oop* ref_to_scan; | |
4164 pss->trim_queue(); | |
4165 IF_G1_DETAILED_STATS(pss->note_steal_attempt()); | |
4166 if (queues()->steal(pss->queue_num(), | |
4167 pss->hash_seed(), | |
4168 ref_to_scan)) { | |
4169 IF_G1_DETAILED_STATS(pss->note_steal()); | |
526 | 4170 |
4171 // slightly paranoid tests; I'm trying to catch potential | |
4172 // problems before we go into push_on_queue to know where the | |
4173 // problem is coming from | |
4174 assert(ref_to_scan != NULL, "invariant"); | |
4175 assert(has_partial_array_mask(ref_to_scan) || | |
4176 _g1h->obj_in_cs(*ref_to_scan), "invariant"); | |
342 | 4177 pss->push_on_queue(ref_to_scan); |
4178 continue; | |
4179 } | |
4180 pss->start_term_time(); | |
4181 if (terminator()->offer_termination()) break; | |
4182 pss->end_term_time(); | |
4183 } | |
4184 pss->end_term_time(); | |
4185 pss->retire_alloc_buffers(); | |
4186 } | |
4187 }; | |
4188 | |
4189 class G1ParTask : public AbstractGangTask { | |
4190 protected: | |
4191 G1CollectedHeap* _g1h; | |
4192 RefToScanQueueSet *_queues; | |
4193 ParallelTaskTerminator _terminator; | |
4194 | |
4195 Mutex _stats_lock; | |
4196 Mutex* stats_lock() { return &_stats_lock; } | |
4197 | |
4198 size_t getNCards() { | |
4199 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
4200 / G1BlockOffsetSharedArray::N_bytes; | |
4201 } | |
4202 | |
4203 public: | |
4204 G1ParTask(G1CollectedHeap* g1h, int workers, RefToScanQueueSet *task_queues) | |
4205 : AbstractGangTask("G1 collection"), | |
4206 _g1h(g1h), | |
4207 _queues(task_queues), | |
4208 _terminator(workers, _queues), | |
4209 _stats_lock(Mutex::leaf, "parallel G1 stats lock", true) | |
4210 {} | |
4211 | |
4212 RefToScanQueueSet* queues() { return _queues; } | |
4213 | |
4214 RefToScanQueue *work_queue(int i) { | |
4215 return queues()->queue(i); | |
4216 } | |
4217 | |
4218 void work(int i) { | |
4219 ResourceMark rm; | |
4220 HandleMark hm; | |
4221 | |
526 | 4222 G1ParScanThreadState pss(_g1h, i); |
4223 G1ParScanHeapEvacClosure scan_evac_cl(_g1h, &pss); | |
4224 G1ParScanHeapEvacFailureClosure evac_failure_cl(_g1h, &pss); | |
4225 G1ParScanPartialArrayClosure partial_scan_cl(_g1h, &pss); | |
342 | 4226 |
4227 pss.set_evac_closure(&scan_evac_cl); | |
4228 pss.set_evac_failure_closure(&evac_failure_cl); | |
4229 pss.set_partial_scan_closure(&partial_scan_cl); | |
4230 | |
4231 G1ParScanExtRootClosure only_scan_root_cl(_g1h, &pss); | |
4232 G1ParScanPermClosure only_scan_perm_cl(_g1h, &pss); | |
4233 G1ParScanHeapRSClosure only_scan_heap_rs_cl(_g1h, &pss); | |
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4234 |
342 | 4235 G1ParScanAndMarkExtRootClosure scan_mark_root_cl(_g1h, &pss); |
4236 G1ParScanAndMarkPermClosure scan_mark_perm_cl(_g1h, &pss); | |
4237 G1ParScanAndMarkHeapRSClosure scan_mark_heap_rs_cl(_g1h, &pss); | |
4238 | |
4239 OopsInHeapRegionClosure *scan_root_cl; | |
4240 OopsInHeapRegionClosure *scan_perm_cl; | |
4241 OopsInHeapRegionClosure *scan_so_cl; | |
4242 | |
4243 if (_g1h->g1_policy()->should_initiate_conc_mark()) { | |
4244 scan_root_cl = &scan_mark_root_cl; | |
4245 scan_perm_cl = &scan_mark_perm_cl; | |
4246 scan_so_cl = &scan_mark_heap_rs_cl; | |
4247 } else { | |
4248 scan_root_cl = &only_scan_root_cl; | |
4249 scan_perm_cl = &only_scan_perm_cl; | |
4250 scan_so_cl = &only_scan_heap_rs_cl; | |
4251 } | |
4252 | |
4253 pss.start_strong_roots(); | |
4254 _g1h->g1_process_strong_roots(/* not collecting perm */ false, | |
4255 SharedHeap::SO_AllClasses, | |
4256 scan_root_cl, | |
4257 &only_scan_heap_rs_cl, | |
4258 scan_so_cl, | |
4259 scan_perm_cl, | |
4260 i); | |
4261 pss.end_strong_roots(); | |
4262 { | |
4263 double start = os::elapsedTime(); | |
4264 G1ParEvacuateFollowersClosure evac(_g1h, &pss, _queues, &_terminator); | |
4265 evac.do_void(); | |
4266 double elapsed_ms = (os::elapsedTime()-start)*1000.0; | |
4267 double term_ms = pss.term_time()*1000.0; | |
4268 _g1h->g1_policy()->record_obj_copy_time(i, elapsed_ms-term_ms); | |
4269 _g1h->g1_policy()->record_termination_time(i, term_ms); | |
4270 } | |
545 | 4271 if (G1UseSurvivorSpace) { |
4272 _g1h->g1_policy()->record_thread_age_table(pss.age_table()); | |
4273 } | |
342 | 4274 _g1h->update_surviving_young_words(pss.surviving_young_words()+1); |
4275 | |
4276 // Clean up any par-expanded rem sets. | |
4277 HeapRegionRemSet::par_cleanup(); | |
4278 | |
4279 MutexLocker x(stats_lock()); | |
4280 if (ParallelGCVerbose) { | |
4281 gclog_or_tty->print("Thread %d complete:\n", i); | |
4282 #if G1_DETAILED_STATS | |
4283 gclog_or_tty->print(" Pushes: %7d Pops: %7d Overflows: %7d Steals %7d (in %d attempts)\n", | |
4284 pss.pushes(), | |
4285 pss.pops(), | |
4286 pss.overflow_pushes(), | |
4287 pss.steals(), | |
4288 pss.steal_attempts()); | |
4289 #endif | |
4290 double elapsed = pss.elapsed(); | |
4291 double strong_roots = pss.strong_roots_time(); | |
4292 double term = pss.term_time(); | |
4293 gclog_or_tty->print(" Elapsed: %7.2f ms.\n" | |
4294 " Strong roots: %7.2f ms (%6.2f%%)\n" | |
4295 " Termination: %7.2f ms (%6.2f%%) (in %d entries)\n", | |
4296 elapsed * 1000.0, | |
4297 strong_roots * 1000.0, (strong_roots*100.0/elapsed), | |
4298 term * 1000.0, (term*100.0/elapsed), | |
4299 pss.term_attempts()); | |
4300 size_t total_waste = pss.alloc_buffer_waste() + pss.undo_waste(); | |
4301 gclog_or_tty->print(" Waste: %8dK\n" | |
4302 " Alloc Buffer: %8dK\n" | |
4303 " Undo: %8dK\n", | |
4304 (total_waste * HeapWordSize) / K, | |
4305 (pss.alloc_buffer_waste() * HeapWordSize) / K, | |
4306 (pss.undo_waste() * HeapWordSize) / K); | |
4307 } | |
4308 | |
4309 assert(pss.refs_to_scan() == 0, "Task queue should be empty"); | |
4310 assert(pss.overflowed_refs_to_scan() == 0, "Overflow queue should be empty"); | |
4311 } | |
4312 }; | |
4313 | |
4314 // *** Common G1 Evacuation Stuff | |
4315 | |
4316 class G1CountClosure: public OopsInHeapRegionClosure { | |
4317 public: | |
4318 int n; | |
4319 G1CountClosure() : n(0) {} | |
4320 void do_oop(narrowOop* p) { | |
4321 guarantee(false, "NYI"); | |
4322 } | |
4323 void do_oop(oop* p) { | |
4324 oop obj = *p; | |
4325 assert(obj != NULL && G1CollectedHeap::heap()->obj_in_cs(obj), | |
4326 "Rem set closure called on non-rem-set pointer."); | |
4327 n++; | |
4328 } | |
4329 }; | |
4330 | |
4331 static G1CountClosure count_closure; | |
4332 | |
4333 void | |
4334 G1CollectedHeap:: | |
4335 g1_process_strong_roots(bool collecting_perm_gen, | |
4336 SharedHeap::ScanningOption so, | |
4337 OopClosure* scan_non_heap_roots, | |
4338 OopsInHeapRegionClosure* scan_rs, | |
4339 OopsInHeapRegionClosure* scan_so, | |
4340 OopsInGenClosure* scan_perm, | |
4341 int worker_i) { | |
4342 // First scan the strong roots, including the perm gen. | |
4343 double ext_roots_start = os::elapsedTime(); | |
4344 double closure_app_time_sec = 0.0; | |
4345 | |
4346 BufferingOopClosure buf_scan_non_heap_roots(scan_non_heap_roots); | |
4347 BufferingOopsInGenClosure buf_scan_perm(scan_perm); | |
4348 buf_scan_perm.set_generation(perm_gen()); | |
4349 | |
4350 process_strong_roots(collecting_perm_gen, so, | |
4351 &buf_scan_non_heap_roots, | |
4352 &buf_scan_perm); | |
4353 // Finish up any enqueued closure apps. | |
4354 buf_scan_non_heap_roots.done(); | |
4355 buf_scan_perm.done(); | |
4356 double ext_roots_end = os::elapsedTime(); | |
4357 g1_policy()->reset_obj_copy_time(worker_i); | |
4358 double obj_copy_time_sec = | |
4359 buf_scan_non_heap_roots.closure_app_seconds() + | |
4360 buf_scan_perm.closure_app_seconds(); | |
4361 g1_policy()->record_obj_copy_time(worker_i, obj_copy_time_sec * 1000.0); | |
4362 double ext_root_time_ms = | |
4363 ((ext_roots_end - ext_roots_start) - obj_copy_time_sec) * 1000.0; | |
4364 g1_policy()->record_ext_root_scan_time(worker_i, ext_root_time_ms); | |
4365 | |
4366 // Scan strong roots in mark stack. | |
4367 if (!_process_strong_tasks->is_task_claimed(G1H_PS_mark_stack_oops_do)) { | |
4368 concurrent_mark()->oops_do(scan_non_heap_roots); | |
4369 } | |
4370 double mark_stack_scan_ms = (os::elapsedTime() - ext_roots_end) * 1000.0; | |
4371 g1_policy()->record_mark_stack_scan_time(worker_i, mark_stack_scan_ms); | |
4372 | |
4373 // XXX What should this be doing in the parallel case? | |
4374 g1_policy()->record_collection_pause_end_CH_strong_roots(); | |
4375 if (G1VerifyRemSet) { | |
4376 // :::: FIXME :::: | |
4377 // The stupid remembered set doesn't know how to filter out dead | |
4378 // objects, which the smart one does, and so when it is created | |
4379 // and then compared the number of entries in each differs and | |
4380 // the verification code fails. | |
4381 guarantee(false, "verification code is broken, see note"); | |
4382 | |
4383 // Let's make sure that the current rem set agrees with the stupidest | |
4384 // one possible! | |
4385 bool refs_enabled = ref_processor()->discovery_enabled(); | |
4386 if (refs_enabled) ref_processor()->disable_discovery(); | |
4387 StupidG1RemSet stupid(this); | |
4388 count_closure.n = 0; | |
4389 stupid.oops_into_collection_set_do(&count_closure, worker_i); | |
4390 int stupid_n = count_closure.n; | |
4391 count_closure.n = 0; | |
4392 g1_rem_set()->oops_into_collection_set_do(&count_closure, worker_i); | |
4393 guarantee(count_closure.n == stupid_n, "Old and new rem sets differ."); | |
4394 gclog_or_tty->print_cr("\nFound %d pointers in heap RS.", count_closure.n); | |
4395 if (refs_enabled) ref_processor()->enable_discovery(); | |
4396 } | |
4397 if (scan_so != NULL) { | |
4398 scan_scan_only_set(scan_so, worker_i); | |
4399 } | |
4400 // Now scan the complement of the collection set. | |
4401 if (scan_rs != NULL) { | |
4402 g1_rem_set()->oops_into_collection_set_do(scan_rs, worker_i); | |
4403 } | |
4404 // Finish with the ref_processor roots. | |
4405 if (!_process_strong_tasks->is_task_claimed(G1H_PS_refProcessor_oops_do)) { | |
4406 ref_processor()->oops_do(scan_non_heap_roots); | |
4407 } | |
4408 g1_policy()->record_collection_pause_end_G1_strong_roots(); | |
4409 _process_strong_tasks->all_tasks_completed(); | |
4410 } | |
4411 | |
4412 void | |
4413 G1CollectedHeap::scan_scan_only_region(HeapRegion* r, | |
4414 OopsInHeapRegionClosure* oc, | |
4415 int worker_i) { | |
4416 HeapWord* startAddr = r->bottom(); | |
4417 HeapWord* endAddr = r->used_region().end(); | |
4418 | |
4419 oc->set_region(r); | |
4420 | |
4421 HeapWord* p = r->bottom(); | |
4422 HeapWord* t = r->top(); | |
4423 guarantee( p == r->next_top_at_mark_start(), "invariant" ); | |
4424 while (p < t) { | |
4425 oop obj = oop(p); | |
4426 p += obj->oop_iterate(oc); | |
4427 } | |
4428 } | |
4429 | |
4430 void | |
4431 G1CollectedHeap::scan_scan_only_set(OopsInHeapRegionClosure* oc, | |
4432 int worker_i) { | |
4433 double start = os::elapsedTime(); | |
4434 | |
4435 BufferingOopsInHeapRegionClosure boc(oc); | |
4436 | |
4437 FilterInHeapRegionAndIntoCSClosure scan_only(this, &boc); | |
4438 FilterAndMarkInHeapRegionAndIntoCSClosure scan_and_mark(this, &boc, concurrent_mark()); | |
4439 | |
4440 OopsInHeapRegionClosure *foc; | |
4441 if (g1_policy()->should_initiate_conc_mark()) | |
4442 foc = &scan_and_mark; | |
4443 else | |
4444 foc = &scan_only; | |
4445 | |
4446 HeapRegion* hr; | |
4447 int n = 0; | |
4448 while ((hr = _young_list->par_get_next_scan_only_region()) != NULL) { | |
4449 scan_scan_only_region(hr, foc, worker_i); | |
4450 ++n; | |
4451 } | |
4452 boc.done(); | |
4453 | |
4454 double closure_app_s = boc.closure_app_seconds(); | |
4455 g1_policy()->record_obj_copy_time(worker_i, closure_app_s * 1000.0); | |
4456 double ms = (os::elapsedTime() - start - closure_app_s)*1000.0; | |
4457 g1_policy()->record_scan_only_time(worker_i, ms, n); | |
4458 } | |
4459 | |
4460 void | |
4461 G1CollectedHeap::g1_process_weak_roots(OopClosure* root_closure, | |
4462 OopClosure* non_root_closure) { | |
4463 SharedHeap::process_weak_roots(root_closure, non_root_closure); | |
4464 } | |
4465 | |
4466 | |
4467 class SaveMarksClosure: public HeapRegionClosure { | |
4468 public: | |
4469 bool doHeapRegion(HeapRegion* r) { | |
4470 r->save_marks(); | |
4471 return false; | |
4472 } | |
4473 }; | |
4474 | |
4475 void G1CollectedHeap::save_marks() { | |
4476 if (ParallelGCThreads == 0) { | |
4477 SaveMarksClosure sm; | |
4478 heap_region_iterate(&sm); | |
4479 } | |
4480 // We do this even in the parallel case | |
4481 perm_gen()->save_marks(); | |
4482 } | |
4483 | |
4484 void G1CollectedHeap::evacuate_collection_set() { | |
4485 set_evacuation_failed(false); | |
4486 | |
4487 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
4488 concurrent_g1_refine()->set_use_cache(false); | |
4489 int n_workers = (ParallelGCThreads > 0 ? workers()->total_workers() : 1); | |
4490 set_par_threads(n_workers); | |
4491 G1ParTask g1_par_task(this, n_workers, _task_queues); | |
4492 | |
4493 init_for_evac_failure(NULL); | |
4494 | |
4495 change_strong_roots_parity(); // In preparation for parallel strong roots. | |
4496 rem_set()->prepare_for_younger_refs_iterate(true); | |
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4497 |
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4498 assert(dirty_card_queue_set().completed_buffers_num() == 0, "Should be empty"); |
342 | 4499 double start_par = os::elapsedTime(); |
4500 if (ParallelGCThreads > 0) { | |
4501 // The individual threads will set their evac-failure closures. | |
4502 workers()->run_task(&g1_par_task); | |
4503 } else { | |
4504 g1_par_task.work(0); | |
4505 } | |
4506 | |
4507 double par_time = (os::elapsedTime() - start_par) * 1000.0; | |
4508 g1_policy()->record_par_time(par_time); | |
4509 set_par_threads(0); | |
4510 // Is this the right thing to do here? We don't save marks | |
4511 // on individual heap regions when we allocate from | |
4512 // them in parallel, so this seems like the correct place for this. | |
545 | 4513 retire_all_alloc_regions(); |
342 | 4514 { |
4515 G1IsAliveClosure is_alive(this); | |
4516 G1KeepAliveClosure keep_alive(this); | |
4517 JNIHandles::weak_oops_do(&is_alive, &keep_alive); | |
4518 } | |
4519 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); | |
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4520 |
342 | 4521 concurrent_g1_refine()->set_use_cache(true); |
4522 | |
4523 finalize_for_evac_failure(); | |
4524 | |
4525 // Must do this before removing self-forwarding pointers, which clears | |
4526 // the per-region evac-failure flags. | |
4527 concurrent_mark()->complete_marking_in_collection_set(); | |
4528 | |
4529 if (evacuation_failed()) { | |
4530 remove_self_forwarding_pointers(); | |
4531 if (PrintGCDetails) { | |
4532 gclog_or_tty->print(" (evacuation failed)"); | |
4533 } else if (PrintGC) { | |
4534 gclog_or_tty->print("--"); | |
4535 } | |
4536 } | |
4537 | |
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4538 if (G1DeferredRSUpdate) { |
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4539 RedirtyLoggedCardTableEntryFastClosure redirty; |
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4540 dirty_card_queue_set().set_closure(&redirty); |
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4541 dirty_card_queue_set().apply_closure_to_all_completed_buffers(); |
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4542 JavaThread::dirty_card_queue_set().merge_bufferlists(&dirty_card_queue_set()); |
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4543 assert(dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
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4544 } |
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4545 |
342 | 4546 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
4547 } | |
4548 | |
4549 void G1CollectedHeap::free_region(HeapRegion* hr) { | |
4550 size_t pre_used = 0; | |
4551 size_t cleared_h_regions = 0; | |
4552 size_t freed_regions = 0; | |
4553 UncleanRegionList local_list; | |
4554 | |
4555 HeapWord* start = hr->bottom(); | |
4556 HeapWord* end = hr->prev_top_at_mark_start(); | |
4557 size_t used_bytes = hr->used(); | |
4558 size_t live_bytes = hr->max_live_bytes(); | |
4559 if (used_bytes > 0) { | |
4560 guarantee( live_bytes <= used_bytes, "invariant" ); | |
4561 } else { | |
4562 guarantee( live_bytes == 0, "invariant" ); | |
4563 } | |
4564 | |
4565 size_t garbage_bytes = used_bytes - live_bytes; | |
4566 if (garbage_bytes > 0) | |
4567 g1_policy()->decrease_known_garbage_bytes(garbage_bytes); | |
4568 | |
4569 free_region_work(hr, pre_used, cleared_h_regions, freed_regions, | |
4570 &local_list); | |
4571 finish_free_region_work(pre_used, cleared_h_regions, freed_regions, | |
4572 &local_list); | |
4573 } | |
4574 | |
4575 void | |
4576 G1CollectedHeap::free_region_work(HeapRegion* hr, | |
4577 size_t& pre_used, | |
4578 size_t& cleared_h_regions, | |
4579 size_t& freed_regions, | |
4580 UncleanRegionList* list, | |
4581 bool par) { | |
4582 assert(!hr->popular(), "should not free popular regions"); | |
4583 pre_used += hr->used(); | |
4584 if (hr->isHumongous()) { | |
4585 assert(hr->startsHumongous(), | |
4586 "Only the start of a humongous region should be freed."); | |
4587 int ind = _hrs->find(hr); | |
4588 assert(ind != -1, "Should have an index."); | |
4589 // Clear the start region. | |
4590 hr->hr_clear(par, true /*clear_space*/); | |
4591 list->insert_before_head(hr); | |
4592 cleared_h_regions++; | |
4593 freed_regions++; | |
4594 // Clear any continued regions. | |
4595 ind++; | |
4596 while ((size_t)ind < n_regions()) { | |
4597 HeapRegion* hrc = _hrs->at(ind); | |
4598 if (!hrc->continuesHumongous()) break; | |
4599 // Otherwise, does continue the H region. | |
4600 assert(hrc->humongous_start_region() == hr, "Huh?"); | |
4601 hrc->hr_clear(par, true /*clear_space*/); | |
4602 cleared_h_regions++; | |
4603 freed_regions++; | |
4604 list->insert_before_head(hrc); | |
4605 ind++; | |
4606 } | |
4607 } else { | |
4608 hr->hr_clear(par, true /*clear_space*/); | |
4609 list->insert_before_head(hr); | |
4610 freed_regions++; | |
4611 // If we're using clear2, this should not be enabled. | |
4612 // assert(!hr->in_cohort(), "Can't be both free and in a cohort."); | |
4613 } | |
4614 } | |
4615 | |
4616 void G1CollectedHeap::finish_free_region_work(size_t pre_used, | |
4617 size_t cleared_h_regions, | |
4618 size_t freed_regions, | |
4619 UncleanRegionList* list) { | |
4620 if (list != NULL && list->sz() > 0) { | |
4621 prepend_region_list_on_unclean_list(list); | |
4622 } | |
4623 // Acquire a lock, if we're parallel, to update possibly-shared | |
4624 // variables. | |
4625 Mutex* lock = (n_par_threads() > 0) ? ParGCRareEvent_lock : NULL; | |
4626 { | |
4627 MutexLockerEx x(lock, Mutex::_no_safepoint_check_flag); | |
4628 _summary_bytes_used -= pre_used; | |
4629 _num_humongous_regions -= (int) cleared_h_regions; | |
4630 _free_regions += freed_regions; | |
4631 } | |
4632 } | |
4633 | |
4634 | |
4635 void G1CollectedHeap::dirtyCardsForYoungRegions(CardTableModRefBS* ct_bs, HeapRegion* list) { | |
4636 while (list != NULL) { | |
4637 guarantee( list->is_young(), "invariant" ); | |
4638 | |
4639 HeapWord* bottom = list->bottom(); | |
4640 HeapWord* end = list->end(); | |
4641 MemRegion mr(bottom, end); | |
4642 ct_bs->dirty(mr); | |
4643 | |
4644 list = list->get_next_young_region(); | |
4645 } | |
4646 } | |
4647 | |
4648 void G1CollectedHeap::cleanUpCardTable() { | |
4649 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (barrier_set()); | |
4650 double start = os::elapsedTime(); | |
4651 | |
4652 ct_bs->clear(_g1_committed); | |
4653 | |
4654 // now, redirty the cards of the scan-only and survivor regions | |
4655 // (it seemed faster to do it this way, instead of iterating over | |
4656 // all regions and then clearing / dirtying as approprite) | |
4657 dirtyCardsForYoungRegions(ct_bs, _young_list->first_scan_only_region()); | |
4658 dirtyCardsForYoungRegions(ct_bs, _young_list->first_survivor_region()); | |
4659 | |
4660 double elapsed = os::elapsedTime() - start; | |
4661 g1_policy()->record_clear_ct_time( elapsed * 1000.0); | |
4662 } | |
4663 | |
4664 | |
4665 void G1CollectedHeap::do_collection_pause_if_appropriate(size_t word_size) { | |
4666 // First do any popular regions. | |
4667 HeapRegion* hr; | |
4668 while ((hr = popular_region_to_evac()) != NULL) { | |
4669 evac_popular_region(hr); | |
4670 } | |
4671 // Now do heuristic pauses. | |
4672 if (g1_policy()->should_do_collection_pause(word_size)) { | |
4673 do_collection_pause(); | |
4674 } | |
4675 } | |
4676 | |
4677 void G1CollectedHeap::free_collection_set(HeapRegion* cs_head) { | |
4678 double young_time_ms = 0.0; | |
4679 double non_young_time_ms = 0.0; | |
4680 | |
4681 G1CollectorPolicy* policy = g1_policy(); | |
4682 | |
4683 double start_sec = os::elapsedTime(); | |
4684 bool non_young = true; | |
4685 | |
4686 HeapRegion* cur = cs_head; | |
4687 int age_bound = -1; | |
4688 size_t rs_lengths = 0; | |
4689 | |
4690 while (cur != NULL) { | |
4691 if (non_young) { | |
4692 if (cur->is_young()) { | |
4693 double end_sec = os::elapsedTime(); | |
4694 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
4695 non_young_time_ms += elapsed_ms; | |
4696 | |
4697 start_sec = os::elapsedTime(); | |
4698 non_young = false; | |
4699 } | |
4700 } else { | |
4701 if (!cur->is_on_free_list()) { | |
4702 double end_sec = os::elapsedTime(); | |
4703 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
4704 young_time_ms += elapsed_ms; | |
4705 | |
4706 start_sec = os::elapsedTime(); | |
4707 non_young = true; | |
4708 } | |
4709 } | |
4710 | |
4711 rs_lengths += cur->rem_set()->occupied(); | |
4712 | |
4713 HeapRegion* next = cur->next_in_collection_set(); | |
4714 assert(cur->in_collection_set(), "bad CS"); | |
4715 cur->set_next_in_collection_set(NULL); | |
4716 cur->set_in_collection_set(false); | |
4717 | |
4718 if (cur->is_young()) { | |
4719 int index = cur->young_index_in_cset(); | |
4720 guarantee( index != -1, "invariant" ); | |
4721 guarantee( (size_t)index < policy->young_cset_length(), "invariant" ); | |
4722 size_t words_survived = _surviving_young_words[index]; | |
4723 cur->record_surv_words_in_group(words_survived); | |
4724 } else { | |
4725 int index = cur->young_index_in_cset(); | |
4726 guarantee( index == -1, "invariant" ); | |
4727 } | |
4728 | |
4729 assert( (cur->is_young() && cur->young_index_in_cset() > -1) || | |
4730 (!cur->is_young() && cur->young_index_in_cset() == -1), | |
4731 "invariant" ); | |
4732 | |
4733 if (!cur->evacuation_failed()) { | |
4734 // And the region is empty. | |
4735 assert(!cur->is_empty(), | |
4736 "Should not have empty regions in a CS."); | |
4737 free_region(cur); | |
4738 } else { | |
4739 guarantee( !cur->is_scan_only(), "should not be scan only" ); | |
4740 cur->uninstall_surv_rate_group(); | |
4741 if (cur->is_young()) | |
4742 cur->set_young_index_in_cset(-1); | |
4743 cur->set_not_young(); | |
4744 cur->set_evacuation_failed(false); | |
4745 } | |
4746 cur = next; | |
4747 } | |
4748 | |
4749 policy->record_max_rs_lengths(rs_lengths); | |
4750 policy->cset_regions_freed(); | |
4751 | |
4752 double end_sec = os::elapsedTime(); | |
4753 double elapsed_ms = (end_sec - start_sec) * 1000.0; | |
4754 if (non_young) | |
4755 non_young_time_ms += elapsed_ms; | |
4756 else | |
4757 young_time_ms += elapsed_ms; | |
4758 | |
4759 policy->record_young_free_cset_time_ms(young_time_ms); | |
4760 policy->record_non_young_free_cset_time_ms(non_young_time_ms); | |
4761 } | |
4762 | |
4763 HeapRegion* | |
4764 G1CollectedHeap::alloc_region_from_unclean_list_locked(bool zero_filled) { | |
4765 assert(ZF_mon->owned_by_self(), "Precondition"); | |
4766 HeapRegion* res = pop_unclean_region_list_locked(); | |
4767 if (res != NULL) { | |
4768 assert(!res->continuesHumongous() && | |
4769 res->zero_fill_state() != HeapRegion::Allocated, | |
4770 "Only free regions on unclean list."); | |
4771 if (zero_filled) { | |
4772 res->ensure_zero_filled_locked(); | |
4773 res->set_zero_fill_allocated(); | |
4774 } | |
4775 } | |
4776 return res; | |
4777 } | |
4778 | |
4779 HeapRegion* G1CollectedHeap::alloc_region_from_unclean_list(bool zero_filled) { | |
4780 MutexLockerEx zx(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4781 return alloc_region_from_unclean_list_locked(zero_filled); | |
4782 } | |
4783 | |
4784 void G1CollectedHeap::put_region_on_unclean_list(HeapRegion* r) { | |
4785 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4786 put_region_on_unclean_list_locked(r); | |
4787 if (should_zf()) ZF_mon->notify_all(); // Wake up ZF thread. | |
4788 } | |
4789 | |
4790 void G1CollectedHeap::set_unclean_regions_coming(bool b) { | |
4791 MutexLockerEx x(Cleanup_mon); | |
4792 set_unclean_regions_coming_locked(b); | |
4793 } | |
4794 | |
4795 void G1CollectedHeap::set_unclean_regions_coming_locked(bool b) { | |
4796 assert(Cleanup_mon->owned_by_self(), "Precondition"); | |
4797 _unclean_regions_coming = b; | |
4798 // Wake up mutator threads that might be waiting for completeCleanup to | |
4799 // finish. | |
4800 if (!b) Cleanup_mon->notify_all(); | |
4801 } | |
4802 | |
4803 void G1CollectedHeap::wait_for_cleanup_complete() { | |
4804 MutexLockerEx x(Cleanup_mon); | |
4805 wait_for_cleanup_complete_locked(); | |
4806 } | |
4807 | |
4808 void G1CollectedHeap::wait_for_cleanup_complete_locked() { | |
4809 assert(Cleanup_mon->owned_by_self(), "precondition"); | |
4810 while (_unclean_regions_coming) { | |
4811 Cleanup_mon->wait(); | |
4812 } | |
4813 } | |
4814 | |
4815 void | |
4816 G1CollectedHeap::put_region_on_unclean_list_locked(HeapRegion* r) { | |
4817 assert(ZF_mon->owned_by_self(), "precondition."); | |
4818 _unclean_region_list.insert_before_head(r); | |
4819 } | |
4820 | |
4821 void | |
4822 G1CollectedHeap::prepend_region_list_on_unclean_list(UncleanRegionList* list) { | |
4823 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4824 prepend_region_list_on_unclean_list_locked(list); | |
4825 if (should_zf()) ZF_mon->notify_all(); // Wake up ZF thread. | |
4826 } | |
4827 | |
4828 void | |
4829 G1CollectedHeap:: | |
4830 prepend_region_list_on_unclean_list_locked(UncleanRegionList* list) { | |
4831 assert(ZF_mon->owned_by_self(), "precondition."); | |
4832 _unclean_region_list.prepend_list(list); | |
4833 } | |
4834 | |
4835 HeapRegion* G1CollectedHeap::pop_unclean_region_list_locked() { | |
4836 assert(ZF_mon->owned_by_self(), "precondition."); | |
4837 HeapRegion* res = _unclean_region_list.pop(); | |
4838 if (res != NULL) { | |
4839 // Inform ZF thread that there's a new unclean head. | |
4840 if (_unclean_region_list.hd() != NULL && should_zf()) | |
4841 ZF_mon->notify_all(); | |
4842 } | |
4843 return res; | |
4844 } | |
4845 | |
4846 HeapRegion* G1CollectedHeap::peek_unclean_region_list_locked() { | |
4847 assert(ZF_mon->owned_by_self(), "precondition."); | |
4848 return _unclean_region_list.hd(); | |
4849 } | |
4850 | |
4851 | |
4852 bool G1CollectedHeap::move_cleaned_region_to_free_list_locked() { | |
4853 assert(ZF_mon->owned_by_self(), "Precondition"); | |
4854 HeapRegion* r = peek_unclean_region_list_locked(); | |
4855 if (r != NULL && r->zero_fill_state() == HeapRegion::ZeroFilled) { | |
4856 // Result of below must be equal to "r", since we hold the lock. | |
4857 (void)pop_unclean_region_list_locked(); | |
4858 put_free_region_on_list_locked(r); | |
4859 return true; | |
4860 } else { | |
4861 return false; | |
4862 } | |
4863 } | |
4864 | |
4865 bool G1CollectedHeap::move_cleaned_region_to_free_list() { | |
4866 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4867 return move_cleaned_region_to_free_list_locked(); | |
4868 } | |
4869 | |
4870 | |
4871 void G1CollectedHeap::put_free_region_on_list_locked(HeapRegion* r) { | |
4872 assert(ZF_mon->owned_by_self(), "precondition."); | |
4873 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
4874 assert(r->zero_fill_state() == HeapRegion::ZeroFilled, | |
4875 "Regions on free list must be zero filled"); | |
4876 assert(!r->isHumongous(), "Must not be humongous."); | |
4877 assert(r->is_empty(), "Better be empty"); | |
4878 assert(!r->is_on_free_list(), | |
4879 "Better not already be on free list"); | |
4880 assert(!r->is_on_unclean_list(), | |
4881 "Better not already be on unclean list"); | |
4882 r->set_on_free_list(true); | |
4883 r->set_next_on_free_list(_free_region_list); | |
4884 _free_region_list = r; | |
4885 _free_region_list_size++; | |
4886 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
4887 } | |
4888 | |
4889 void G1CollectedHeap::put_free_region_on_list(HeapRegion* r) { | |
4890 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4891 put_free_region_on_list_locked(r); | |
4892 } | |
4893 | |
4894 HeapRegion* G1CollectedHeap::pop_free_region_list_locked() { | |
4895 assert(ZF_mon->owned_by_self(), "precondition."); | |
4896 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
4897 HeapRegion* res = _free_region_list; | |
4898 if (res != NULL) { | |
4899 _free_region_list = res->next_from_free_list(); | |
4900 _free_region_list_size--; | |
4901 res->set_on_free_list(false); | |
4902 res->set_next_on_free_list(NULL); | |
4903 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
4904 } | |
4905 return res; | |
4906 } | |
4907 | |
4908 | |
4909 HeapRegion* G1CollectedHeap::alloc_free_region_from_lists(bool zero_filled) { | |
4910 // By self, or on behalf of self. | |
4911 assert(Heap_lock->is_locked(), "Precondition"); | |
4912 HeapRegion* res = NULL; | |
4913 bool first = true; | |
4914 while (res == NULL) { | |
4915 if (zero_filled || !first) { | |
4916 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4917 res = pop_free_region_list_locked(); | |
4918 if (res != NULL) { | |
4919 assert(!res->zero_fill_is_allocated(), | |
4920 "No allocated regions on free list."); | |
4921 res->set_zero_fill_allocated(); | |
4922 } else if (!first) { | |
4923 break; // We tried both, time to return NULL. | |
4924 } | |
4925 } | |
4926 | |
4927 if (res == NULL) { | |
4928 res = alloc_region_from_unclean_list(zero_filled); | |
4929 } | |
4930 assert(res == NULL || | |
4931 !zero_filled || | |
4932 res->zero_fill_is_allocated(), | |
4933 "We must have allocated the region we're returning"); | |
4934 first = false; | |
4935 } | |
4936 return res; | |
4937 } | |
4938 | |
4939 void G1CollectedHeap::remove_allocated_regions_from_lists() { | |
4940 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4941 { | |
4942 HeapRegion* prev = NULL; | |
4943 HeapRegion* cur = _unclean_region_list.hd(); | |
4944 while (cur != NULL) { | |
4945 HeapRegion* next = cur->next_from_unclean_list(); | |
4946 if (cur->zero_fill_is_allocated()) { | |
4947 // Remove from the list. | |
4948 if (prev == NULL) { | |
4949 (void)_unclean_region_list.pop(); | |
4950 } else { | |
4951 _unclean_region_list.delete_after(prev); | |
4952 } | |
4953 cur->set_on_unclean_list(false); | |
4954 cur->set_next_on_unclean_list(NULL); | |
4955 } else { | |
4956 prev = cur; | |
4957 } | |
4958 cur = next; | |
4959 } | |
4960 assert(_unclean_region_list.sz() == unclean_region_list_length(), | |
4961 "Inv"); | |
4962 } | |
4963 | |
4964 { | |
4965 HeapRegion* prev = NULL; | |
4966 HeapRegion* cur = _free_region_list; | |
4967 while (cur != NULL) { | |
4968 HeapRegion* next = cur->next_from_free_list(); | |
4969 if (cur->zero_fill_is_allocated()) { | |
4970 // Remove from the list. | |
4971 if (prev == NULL) { | |
4972 _free_region_list = cur->next_from_free_list(); | |
4973 } else { | |
4974 prev->set_next_on_free_list(cur->next_from_free_list()); | |
4975 } | |
4976 cur->set_on_free_list(false); | |
4977 cur->set_next_on_free_list(NULL); | |
4978 _free_region_list_size--; | |
4979 } else { | |
4980 prev = cur; | |
4981 } | |
4982 cur = next; | |
4983 } | |
4984 assert(_free_region_list_size == free_region_list_length(), "Inv"); | |
4985 } | |
4986 } | |
4987 | |
4988 bool G1CollectedHeap::verify_region_lists() { | |
4989 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
4990 return verify_region_lists_locked(); | |
4991 } | |
4992 | |
4993 bool G1CollectedHeap::verify_region_lists_locked() { | |
4994 HeapRegion* unclean = _unclean_region_list.hd(); | |
4995 while (unclean != NULL) { | |
4996 guarantee(unclean->is_on_unclean_list(), "Well, it is!"); | |
4997 guarantee(!unclean->is_on_free_list(), "Well, it shouldn't be!"); | |
4998 guarantee(unclean->zero_fill_state() != HeapRegion::Allocated, | |
4999 "Everything else is possible."); | |
5000 unclean = unclean->next_from_unclean_list(); | |
5001 } | |
5002 guarantee(_unclean_region_list.sz() == unclean_region_list_length(), "Inv"); | |
5003 | |
5004 HeapRegion* free_r = _free_region_list; | |
5005 while (free_r != NULL) { | |
5006 assert(free_r->is_on_free_list(), "Well, it is!"); | |
5007 assert(!free_r->is_on_unclean_list(), "Well, it shouldn't be!"); | |
5008 switch (free_r->zero_fill_state()) { | |
5009 case HeapRegion::NotZeroFilled: | |
5010 case HeapRegion::ZeroFilling: | |
5011 guarantee(false, "Should not be on free list."); | |
5012 break; | |
5013 default: | |
5014 // Everything else is possible. | |
5015 break; | |
5016 } | |
5017 free_r = free_r->next_from_free_list(); | |
5018 } | |
5019 guarantee(_free_region_list_size == free_region_list_length(), "Inv"); | |
5020 // If we didn't do an assertion... | |
5021 return true; | |
5022 } | |
5023 | |
5024 size_t G1CollectedHeap::free_region_list_length() { | |
5025 assert(ZF_mon->owned_by_self(), "precondition."); | |
5026 size_t len = 0; | |
5027 HeapRegion* cur = _free_region_list; | |
5028 while (cur != NULL) { | |
5029 len++; | |
5030 cur = cur->next_from_free_list(); | |
5031 } | |
5032 return len; | |
5033 } | |
5034 | |
5035 size_t G1CollectedHeap::unclean_region_list_length() { | |
5036 assert(ZF_mon->owned_by_self(), "precondition."); | |
5037 return _unclean_region_list.length(); | |
5038 } | |
5039 | |
5040 size_t G1CollectedHeap::n_regions() { | |
5041 return _hrs->length(); | |
5042 } | |
5043 | |
5044 size_t G1CollectedHeap::max_regions() { | |
5045 return | |
5046 (size_t)align_size_up(g1_reserved_obj_bytes(), HeapRegion::GrainBytes) / | |
5047 HeapRegion::GrainBytes; | |
5048 } | |
5049 | |
5050 size_t G1CollectedHeap::free_regions() { | |
5051 /* Possibly-expensive assert. | |
5052 assert(_free_regions == count_free_regions(), | |
5053 "_free_regions is off."); | |
5054 */ | |
5055 return _free_regions; | |
5056 } | |
5057 | |
5058 bool G1CollectedHeap::should_zf() { | |
5059 return _free_region_list_size < (size_t) G1ConcZFMaxRegions; | |
5060 } | |
5061 | |
5062 class RegionCounter: public HeapRegionClosure { | |
5063 size_t _n; | |
5064 public: | |
5065 RegionCounter() : _n(0) {} | |
5066 bool doHeapRegion(HeapRegion* r) { | |
5067 if (r->is_empty() && !r->popular()) { | |
5068 assert(!r->isHumongous(), "H regions should not be empty."); | |
5069 _n++; | |
5070 } | |
5071 return false; | |
5072 } | |
5073 int res() { return (int) _n; } | |
5074 }; | |
5075 | |
5076 size_t G1CollectedHeap::count_free_regions() { | |
5077 RegionCounter rc; | |
5078 heap_region_iterate(&rc); | |
5079 size_t n = rc.res(); | |
5080 if (_cur_alloc_region != NULL && _cur_alloc_region->is_empty()) | |
5081 n--; | |
5082 return n; | |
5083 } | |
5084 | |
5085 size_t G1CollectedHeap::count_free_regions_list() { | |
5086 size_t n = 0; | |
5087 size_t o = 0; | |
5088 ZF_mon->lock_without_safepoint_check(); | |
5089 HeapRegion* cur = _free_region_list; | |
5090 while (cur != NULL) { | |
5091 cur = cur->next_from_free_list(); | |
5092 n++; | |
5093 } | |
5094 size_t m = unclean_region_list_length(); | |
5095 ZF_mon->unlock(); | |
5096 return n + m; | |
5097 } | |
5098 | |
5099 bool G1CollectedHeap::should_set_young_locked() { | |
5100 assert(heap_lock_held_for_gc(), | |
5101 "the heap lock should already be held by or for this thread"); | |
5102 return (g1_policy()->in_young_gc_mode() && | |
5103 g1_policy()->should_add_next_region_to_young_list()); | |
5104 } | |
5105 | |
5106 void G1CollectedHeap::set_region_short_lived_locked(HeapRegion* hr) { | |
5107 assert(heap_lock_held_for_gc(), | |
5108 "the heap lock should already be held by or for this thread"); | |
5109 _young_list->push_region(hr); | |
5110 g1_policy()->set_region_short_lived(hr); | |
5111 } | |
5112 | |
5113 class NoYoungRegionsClosure: public HeapRegionClosure { | |
5114 private: | |
5115 bool _success; | |
5116 public: | |
5117 NoYoungRegionsClosure() : _success(true) { } | |
5118 bool doHeapRegion(HeapRegion* r) { | |
5119 if (r->is_young()) { | |
5120 gclog_or_tty->print_cr("Region ["PTR_FORMAT", "PTR_FORMAT") tagged as young", | |
5121 r->bottom(), r->end()); | |
5122 _success = false; | |
5123 } | |
5124 return false; | |
5125 } | |
5126 bool success() { return _success; } | |
5127 }; | |
5128 | |
5129 bool G1CollectedHeap::check_young_list_empty(bool ignore_scan_only_list, | |
5130 bool check_sample) { | |
5131 bool ret = true; | |
5132 | |
5133 ret = _young_list->check_list_empty(ignore_scan_only_list, check_sample); | |
5134 if (!ignore_scan_only_list) { | |
5135 NoYoungRegionsClosure closure; | |
5136 heap_region_iterate(&closure); | |
5137 ret = ret && closure.success(); | |
5138 } | |
5139 | |
5140 return ret; | |
5141 } | |
5142 | |
5143 void G1CollectedHeap::empty_young_list() { | |
5144 assert(heap_lock_held_for_gc(), | |
5145 "the heap lock should already be held by or for this thread"); | |
5146 assert(g1_policy()->in_young_gc_mode(), "should be in young GC mode"); | |
5147 | |
5148 _young_list->empty_list(); | |
5149 } | |
5150 | |
5151 bool G1CollectedHeap::all_alloc_regions_no_allocs_since_save_marks() { | |
5152 bool no_allocs = true; | |
5153 for (int ap = 0; ap < GCAllocPurposeCount && no_allocs; ++ap) { | |
5154 HeapRegion* r = _gc_alloc_regions[ap]; | |
5155 no_allocs = r == NULL || r->saved_mark_at_top(); | |
5156 } | |
5157 return no_allocs; | |
5158 } | |
5159 | |
545 | 5160 void G1CollectedHeap::retire_all_alloc_regions() { |
342 | 5161 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
5162 HeapRegion* r = _gc_alloc_regions[ap]; | |
5163 if (r != NULL) { | |
5164 // Check for aliases. | |
5165 bool has_processed_alias = false; | |
5166 for (int i = 0; i < ap; ++i) { | |
5167 if (_gc_alloc_regions[i] == r) { | |
5168 has_processed_alias = true; | |
5169 break; | |
5170 } | |
5171 } | |
5172 if (!has_processed_alias) { | |
545 | 5173 retire_alloc_region(r, false /* par */); |
342 | 5174 } |
5175 } | |
5176 } | |
5177 } | |
5178 | |
5179 | |
5180 // Done at the start of full GC. | |
5181 void G1CollectedHeap::tear_down_region_lists() { | |
5182 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
5183 while (pop_unclean_region_list_locked() != NULL) ; | |
5184 assert(_unclean_region_list.hd() == NULL && _unclean_region_list.sz() == 0, | |
5185 "Postconditions of loop.") | |
5186 while (pop_free_region_list_locked() != NULL) ; | |
5187 assert(_free_region_list == NULL, "Postcondition of loop."); | |
5188 if (_free_region_list_size != 0) { | |
5189 gclog_or_tty->print_cr("Size is %d.", _free_region_list_size); | |
5190 print(); | |
5191 } | |
5192 assert(_free_region_list_size == 0, "Postconditions of loop."); | |
5193 } | |
5194 | |
5195 | |
5196 class RegionResetter: public HeapRegionClosure { | |
5197 G1CollectedHeap* _g1; | |
5198 int _n; | |
5199 public: | |
5200 RegionResetter() : _g1(G1CollectedHeap::heap()), _n(0) {} | |
5201 bool doHeapRegion(HeapRegion* r) { | |
5202 if (r->continuesHumongous()) return false; | |
5203 if (r->top() > r->bottom()) { | |
5204 if (r->top() < r->end()) { | |
5205 Copy::fill_to_words(r->top(), | |
5206 pointer_delta(r->end(), r->top())); | |
5207 } | |
5208 r->set_zero_fill_allocated(); | |
5209 } else { | |
5210 assert(r->is_empty(), "tautology"); | |
5211 if (r->popular()) { | |
5212 if (r->zero_fill_state() != HeapRegion::Allocated) { | |
5213 r->ensure_zero_filled_locked(); | |
5214 r->set_zero_fill_allocated(); | |
5215 } | |
5216 } else { | |
5217 _n++; | |
5218 switch (r->zero_fill_state()) { | |
5219 case HeapRegion::NotZeroFilled: | |
5220 case HeapRegion::ZeroFilling: | |
5221 _g1->put_region_on_unclean_list_locked(r); | |
5222 break; | |
5223 case HeapRegion::Allocated: | |
5224 r->set_zero_fill_complete(); | |
5225 // no break; go on to put on free list. | |
5226 case HeapRegion::ZeroFilled: | |
5227 _g1->put_free_region_on_list_locked(r); | |
5228 break; | |
5229 } | |
5230 } | |
5231 } | |
5232 return false; | |
5233 } | |
5234 | |
5235 int getFreeRegionCount() {return _n;} | |
5236 }; | |
5237 | |
5238 // Done at the end of full GC. | |
5239 void G1CollectedHeap::rebuild_region_lists() { | |
5240 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
5241 // This needs to go at the end of the full GC. | |
5242 RegionResetter rs; | |
5243 heap_region_iterate(&rs); | |
5244 _free_regions = rs.getFreeRegionCount(); | |
5245 // Tell the ZF thread it may have work to do. | |
5246 if (should_zf()) ZF_mon->notify_all(); | |
5247 } | |
5248 | |
5249 class UsedRegionsNeedZeroFillSetter: public HeapRegionClosure { | |
5250 G1CollectedHeap* _g1; | |
5251 int _n; | |
5252 public: | |
5253 UsedRegionsNeedZeroFillSetter() : _g1(G1CollectedHeap::heap()), _n(0) {} | |
5254 bool doHeapRegion(HeapRegion* r) { | |
5255 if (r->continuesHumongous()) return false; | |
5256 if (r->top() > r->bottom()) { | |
5257 // There are assertions in "set_zero_fill_needed()" below that | |
5258 // require top() == bottom(), so this is technically illegal. | |
5259 // We'll skirt the law here, by making that true temporarily. | |
5260 DEBUG_ONLY(HeapWord* save_top = r->top(); | |
5261 r->set_top(r->bottom())); | |
5262 r->set_zero_fill_needed(); | |
5263 DEBUG_ONLY(r->set_top(save_top)); | |
5264 } | |
5265 return false; | |
5266 } | |
5267 }; | |
5268 | |
5269 // Done at the start of full GC. | |
5270 void G1CollectedHeap::set_used_regions_to_need_zero_fill() { | |
5271 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
5272 // This needs to go at the end of the full GC. | |
5273 UsedRegionsNeedZeroFillSetter rs; | |
5274 heap_region_iterate(&rs); | |
5275 } | |
5276 | |
5277 class CountObjClosure: public ObjectClosure { | |
5278 size_t _n; | |
5279 public: | |
5280 CountObjClosure() : _n(0) {} | |
5281 void do_object(oop obj) { _n++; } | |
5282 size_t n() { return _n; } | |
5283 }; | |
5284 | |
5285 size_t G1CollectedHeap::pop_object_used_objs() { | |
5286 size_t sum_objs = 0; | |
5287 for (int i = 0; i < G1NumPopularRegions; i++) { | |
5288 CountObjClosure cl; | |
5289 _hrs->at(i)->object_iterate(&cl); | |
5290 sum_objs += cl.n(); | |
5291 } | |
5292 return sum_objs; | |
5293 } | |
5294 | |
5295 size_t G1CollectedHeap::pop_object_used_bytes() { | |
5296 size_t sum_bytes = 0; | |
5297 for (int i = 0; i < G1NumPopularRegions; i++) { | |
5298 sum_bytes += _hrs->at(i)->used(); | |
5299 } | |
5300 return sum_bytes; | |
5301 } | |
5302 | |
5303 | |
5304 static int nq = 0; | |
5305 | |
5306 HeapWord* G1CollectedHeap::allocate_popular_object(size_t word_size) { | |
5307 while (_cur_pop_hr_index < G1NumPopularRegions) { | |
5308 HeapRegion* cur_pop_region = _hrs->at(_cur_pop_hr_index); | |
5309 HeapWord* res = cur_pop_region->allocate(word_size); | |
5310 if (res != NULL) { | |
5311 // We account for popular objs directly in the used summary: | |
5312 _summary_bytes_used += (word_size * HeapWordSize); | |
5313 return res; | |
5314 } | |
5315 // Otherwise, try the next region (first making sure that we remember | |
5316 // the last "top" value as the "next_top_at_mark_start", so that | |
5317 // objects made popular during markings aren't automatically considered | |
5318 // live). | |
5319 cur_pop_region->note_end_of_copying(); | |
5320 // Otherwise, try the next region. | |
5321 _cur_pop_hr_index++; | |
5322 } | |
5323 // XXX: For now !!! | |
5324 vm_exit_out_of_memory(word_size, | |
5325 "Not enough pop obj space (To Be Fixed)"); | |
5326 return NULL; | |
5327 } | |
5328 | |
5329 class HeapRegionList: public CHeapObj { | |
5330 public: | |
5331 HeapRegion* hr; | |
5332 HeapRegionList* next; | |
5333 }; | |
5334 | |
5335 void G1CollectedHeap::schedule_popular_region_evac(HeapRegion* r) { | |
5336 // This might happen during parallel GC, so protect by this lock. | |
5337 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
5338 // We don't schedule regions whose evacuations are already pending, or | |
5339 // are already being evacuated. | |
5340 if (!r->popular_pending() && !r->in_collection_set()) { | |
5341 r->set_popular_pending(true); | |
5342 if (G1TracePopularity) { | |
5343 gclog_or_tty->print_cr("Scheduling region "PTR_FORMAT" " | |
5344 "["PTR_FORMAT", "PTR_FORMAT") for pop-object evacuation.", | |
5345 r, r->bottom(), r->end()); | |
5346 } | |
5347 HeapRegionList* hrl = new HeapRegionList; | |
5348 hrl->hr = r; | |
5349 hrl->next = _popular_regions_to_be_evacuated; | |
5350 _popular_regions_to_be_evacuated = hrl; | |
5351 } | |
5352 } | |
5353 | |
5354 HeapRegion* G1CollectedHeap::popular_region_to_evac() { | |
5355 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
5356 HeapRegion* res = NULL; | |
5357 while (_popular_regions_to_be_evacuated != NULL && res == NULL) { | |
5358 HeapRegionList* hrl = _popular_regions_to_be_evacuated; | |
5359 _popular_regions_to_be_evacuated = hrl->next; | |
5360 res = hrl->hr; | |
5361 // The G1RSPopLimit may have increased, so recheck here... | |
5362 if (res->rem_set()->occupied() < (size_t) G1RSPopLimit) { | |
5363 // Hah: don't need to schedule. | |
5364 if (G1TracePopularity) { | |
5365 gclog_or_tty->print_cr("Unscheduling region "PTR_FORMAT" " | |
5366 "["PTR_FORMAT", "PTR_FORMAT") " | |
5367 "for pop-object evacuation (size %d < limit %d)", | |
5368 res, res->bottom(), res->end(), | |
5369 res->rem_set()->occupied(), G1RSPopLimit); | |
5370 } | |
5371 res->set_popular_pending(false); | |
5372 res = NULL; | |
5373 } | |
5374 // We do not reset res->popular() here; if we did so, it would allow | |
5375 // the region to be "rescheduled" for popularity evacuation. Instead, | |
5376 // this is done in the collection pause, with the world stopped. | |
5377 // So the invariant is that the regions in the list have the popularity | |
5378 // boolean set, but having the boolean set does not imply membership | |
5379 // on the list (though there can at most one such pop-pending region | |
5380 // not on the list at any time). | |
5381 delete hrl; | |
5382 } | |
5383 return res; | |
5384 } | |
5385 | |
5386 void G1CollectedHeap::evac_popular_region(HeapRegion* hr) { | |
5387 while (true) { | |
5388 // Don't want to do a GC pause while cleanup is being completed! | |
5389 wait_for_cleanup_complete(); | |
5390 | |
5391 // Read the GC count while holding the Heap_lock | |
5392 int gc_count_before = SharedHeap::heap()->total_collections(); | |
5393 g1_policy()->record_stop_world_start(); | |
5394 | |
5395 { | |
5396 MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back | |
5397 VM_G1PopRegionCollectionPause op(gc_count_before, hr); | |
5398 VMThread::execute(&op); | |
5399 | |
5400 // If the prolog succeeded, we didn't do a GC for this. | |
5401 if (op.prologue_succeeded()) break; | |
5402 } | |
5403 // Otherwise we didn't. We should recheck the size, though, since | |
5404 // the limit may have increased... | |
5405 if (hr->rem_set()->occupied() < (size_t) G1RSPopLimit) { | |
5406 hr->set_popular_pending(false); | |
5407 break; | |
5408 } | |
5409 } | |
5410 } | |
5411 | |
5412 void G1CollectedHeap::atomic_inc_obj_rc(oop obj) { | |
5413 Atomic::inc(obj_rc_addr(obj)); | |
5414 } | |
5415 | |
5416 class CountRCClosure: public OopsInHeapRegionClosure { | |
5417 G1CollectedHeap* _g1h; | |
5418 bool _parallel; | |
5419 public: | |
5420 CountRCClosure(G1CollectedHeap* g1h) : | |
5421 _g1h(g1h), _parallel(ParallelGCThreads > 0) | |
5422 {} | |
5423 void do_oop(narrowOop* p) { | |
5424 guarantee(false, "NYI"); | |
5425 } | |
5426 void do_oop(oop* p) { | |
5427 oop obj = *p; | |
5428 assert(obj != NULL, "Precondition."); | |
5429 if (_parallel) { | |
5430 // We go sticky at the limit to avoid excess contention. | |
5431 // If we want to track the actual RC's further, we'll need to keep a | |
5432 // per-thread hash table or something for the popular objects. | |
5433 if (_g1h->obj_rc(obj) < G1ObjPopLimit) { | |
5434 _g1h->atomic_inc_obj_rc(obj); | |
5435 } | |
5436 } else { | |
5437 _g1h->inc_obj_rc(obj); | |
5438 } | |
5439 } | |
5440 }; | |
5441 | |
5442 class EvacPopObjClosure: public ObjectClosure { | |
5443 G1CollectedHeap* _g1h; | |
5444 size_t _pop_objs; | |
5445 size_t _max_rc; | |
5446 public: | |
5447 EvacPopObjClosure(G1CollectedHeap* g1h) : | |
5448 _g1h(g1h), _pop_objs(0), _max_rc(0) {} | |
5449 | |
5450 void do_object(oop obj) { | |
5451 size_t rc = _g1h->obj_rc(obj); | |
5452 _max_rc = MAX2(rc, _max_rc); | |
5453 if (rc >= (size_t) G1ObjPopLimit) { | |
5454 _g1h->_pop_obj_rc_at_copy.add((double)rc); | |
5455 size_t word_sz = obj->size(); | |
5456 HeapWord* new_pop_loc = _g1h->allocate_popular_object(word_sz); | |
5457 oop new_pop_obj = (oop)new_pop_loc; | |
5458 Copy::aligned_disjoint_words((HeapWord*)obj, new_pop_loc, word_sz); | |
5459 obj->forward_to(new_pop_obj); | |
5460 G1ScanAndBalanceClosure scan_and_balance(_g1h); | |
5461 new_pop_obj->oop_iterate_backwards(&scan_and_balance); | |
5462 // preserve "next" mark bit if marking is in progress. | |
5463 if (_g1h->mark_in_progress() && !_g1h->is_obj_ill(obj)) { | |
5464 _g1h->concurrent_mark()->markAndGrayObjectIfNecessary(new_pop_obj); | |
5465 } | |
5466 | |
5467 if (G1TracePopularity) { | |
5468 gclog_or_tty->print_cr("Found obj " PTR_FORMAT " of word size " SIZE_FORMAT | |
5469 " pop (%d), move to " PTR_FORMAT, | |
5470 (void*) obj, word_sz, | |
5471 _g1h->obj_rc(obj), (void*) new_pop_obj); | |
5472 } | |
5473 _pop_objs++; | |
5474 } | |
5475 } | |
5476 size_t pop_objs() { return _pop_objs; } | |
5477 size_t max_rc() { return _max_rc; } | |
5478 }; | |
5479 | |
5480 class G1ParCountRCTask : public AbstractGangTask { | |
5481 G1CollectedHeap* _g1h; | |
5482 BitMap _bm; | |
5483 | |
5484 size_t getNCards() { | |
5485 return (_g1h->capacity() + G1BlockOffsetSharedArray::N_bytes - 1) | |
5486 / G1BlockOffsetSharedArray::N_bytes; | |
5487 } | |
5488 CountRCClosure _count_rc_closure; | |
5489 public: | |
5490 G1ParCountRCTask(G1CollectedHeap* g1h) : | |
5491 AbstractGangTask("G1 Par RC Count task"), | |
5492 _g1h(g1h), _bm(getNCards()), _count_rc_closure(g1h) | |
5493 {} | |
5494 | |
5495 void work(int i) { | |
5496 ResourceMark rm; | |
5497 HandleMark hm; | |
5498 _g1h->g1_rem_set()->oops_into_collection_set_do(&_count_rc_closure, i); | |
5499 } | |
5500 }; | |
5501 | |
5502 void G1CollectedHeap::popularity_pause_preamble(HeapRegion* popular_region) { | |
5503 // We're evacuating a single region (for popularity). | |
5504 if (G1TracePopularity) { | |
5505 gclog_or_tty->print_cr("Doing pop region pause for ["PTR_FORMAT", "PTR_FORMAT")", | |
5506 popular_region->bottom(), popular_region->end()); | |
5507 } | |
5508 g1_policy()->set_single_region_collection_set(popular_region); | |
5509 size_t max_rc; | |
5510 if (!compute_reference_counts_and_evac_popular(popular_region, | |
5511 &max_rc)) { | |
5512 // We didn't evacuate any popular objects. | |
5513 // We increase the RS popularity limit, to prevent this from | |
5514 // happening in the future. | |
5515 if (G1RSPopLimit < (1 << 30)) { | |
5516 G1RSPopLimit *= 2; | |
5517 } | |
5518 // For now, interesting enough for a message: | |
5519 #if 1 | |
5520 gclog_or_tty->print_cr("In pop region pause for ["PTR_FORMAT", "PTR_FORMAT"), " | |
5521 "failed to find a pop object (max = %d).", | |
5522 popular_region->bottom(), popular_region->end(), | |
5523 max_rc); | |
5524 gclog_or_tty->print_cr("Increased G1RSPopLimit to %d.", G1RSPopLimit); | |
5525 #endif // 0 | |
5526 // Also, we reset the collection set to NULL, to make the rest of | |
5527 // the collection do nothing. | |
5528 assert(popular_region->next_in_collection_set() == NULL, | |
5529 "should be single-region."); | |
5530 popular_region->set_in_collection_set(false); | |
5531 popular_region->set_popular_pending(false); | |
5532 g1_policy()->clear_collection_set(); | |
5533 } | |
5534 } | |
5535 | |
5536 bool G1CollectedHeap:: | |
5537 compute_reference_counts_and_evac_popular(HeapRegion* popular_region, | |
5538 size_t* max_rc) { | |
5539 HeapWord* rc_region_bot; | |
5540 HeapWord* rc_region_end; | |
5541 | |
5542 // Set up the reference count region. | |
5543 HeapRegion* rc_region = newAllocRegion(HeapRegion::GrainWords); | |
5544 if (rc_region != NULL) { | |
5545 rc_region_bot = rc_region->bottom(); | |
5546 rc_region_end = rc_region->end(); | |
5547 } else { | |
5548 rc_region_bot = NEW_C_HEAP_ARRAY(HeapWord, HeapRegion::GrainWords); | |
5549 if (rc_region_bot == NULL) { | |
5550 vm_exit_out_of_memory(HeapRegion::GrainWords, | |
5551 "No space for RC region."); | |
5552 } | |
5553 rc_region_end = rc_region_bot + HeapRegion::GrainWords; | |
5554 } | |
5555 | |
5556 if (G1TracePopularity) | |
5557 gclog_or_tty->print_cr("RC region is ["PTR_FORMAT", "PTR_FORMAT")", | |
5558 rc_region_bot, rc_region_end); | |
5559 if (rc_region_bot > popular_region->bottom()) { | |
5560 _rc_region_above = true; | |
5561 _rc_region_diff = | |
5562 pointer_delta(rc_region_bot, popular_region->bottom(), 1); | |
5563 } else { | |
5564 assert(rc_region_bot < popular_region->bottom(), "Can't be equal."); | |
5565 _rc_region_above = false; | |
5566 _rc_region_diff = | |
5567 pointer_delta(popular_region->bottom(), rc_region_bot, 1); | |
5568 } | |
5569 g1_policy()->record_pop_compute_rc_start(); | |
5570 // Count external references. | |
5571 g1_rem_set()->prepare_for_oops_into_collection_set_do(); | |
5572 if (ParallelGCThreads > 0) { | |
5573 | |
5574 set_par_threads(workers()->total_workers()); | |
5575 G1ParCountRCTask par_count_rc_task(this); | |
5576 workers()->run_task(&par_count_rc_task); | |
5577 set_par_threads(0); | |
5578 | |
5579 } else { | |
5580 CountRCClosure count_rc_closure(this); | |
5581 g1_rem_set()->oops_into_collection_set_do(&count_rc_closure, 0); | |
5582 } | |
5583 g1_rem_set()->cleanup_after_oops_into_collection_set_do(); | |
5584 g1_policy()->record_pop_compute_rc_end(); | |
5585 | |
5586 // Now evacuate popular objects. | |
5587 g1_policy()->record_pop_evac_start(); | |
5588 EvacPopObjClosure evac_pop_obj_cl(this); | |
5589 popular_region->object_iterate(&evac_pop_obj_cl); | |
5590 *max_rc = evac_pop_obj_cl.max_rc(); | |
5591 | |
5592 // Make sure the last "top" value of the current popular region is copied | |
5593 // as the "next_top_at_mark_start", so that objects made popular during | |
5594 // markings aren't automatically considered live. | |
5595 HeapRegion* cur_pop_region = _hrs->at(_cur_pop_hr_index); | |
5596 cur_pop_region->note_end_of_copying(); | |
5597 | |
5598 if (rc_region != NULL) { | |
5599 free_region(rc_region); | |
5600 } else { | |
5601 FREE_C_HEAP_ARRAY(HeapWord, rc_region_bot); | |
5602 } | |
5603 g1_policy()->record_pop_evac_end(); | |
5604 | |
5605 return evac_pop_obj_cl.pop_objs() > 0; | |
5606 } | |
5607 | |
5608 class CountPopObjInfoClosure: public HeapRegionClosure { | |
5609 size_t _objs; | |
5610 size_t _bytes; | |
5611 | |
5612 class CountObjClosure: public ObjectClosure { | |
5613 int _n; | |
5614 public: | |
5615 CountObjClosure() : _n(0) {} | |
5616 void do_object(oop obj) { _n++; } | |
5617 size_t n() { return _n; } | |
5618 }; | |
5619 | |
5620 public: | |
5621 CountPopObjInfoClosure() : _objs(0), _bytes(0) {} | |
5622 bool doHeapRegion(HeapRegion* r) { | |
5623 _bytes += r->used(); | |
5624 CountObjClosure blk; | |
5625 r->object_iterate(&blk); | |
5626 _objs += blk.n(); | |
5627 return false; | |
5628 } | |
5629 size_t objs() { return _objs; } | |
5630 size_t bytes() { return _bytes; } | |
5631 }; | |
5632 | |
5633 | |
5634 void G1CollectedHeap::print_popularity_summary_info() const { | |
5635 CountPopObjInfoClosure blk; | |
5636 for (int i = 0; i <= _cur_pop_hr_index; i++) { | |
5637 blk.doHeapRegion(_hrs->at(i)); | |
5638 } | |
5639 gclog_or_tty->print_cr("\nPopular objects: %d objs, %d bytes.", | |
5640 blk.objs(), blk.bytes()); | |
5641 gclog_or_tty->print_cr(" RC at copy = [avg = %5.2f, max = %5.2f, sd = %5.2f].", | |
5642 _pop_obj_rc_at_copy.avg(), | |
5643 _pop_obj_rc_at_copy.maximum(), | |
5644 _pop_obj_rc_at_copy.sd()); | |
5645 } | |
5646 | |
5647 void G1CollectedHeap::set_refine_cte_cl_concurrency(bool concurrent) { | |
5648 _refine_cte_cl->set_concurrent(concurrent); | |
5649 } | |
5650 | |
5651 #ifndef PRODUCT | |
5652 | |
5653 class PrintHeapRegionClosure: public HeapRegionClosure { | |
5654 public: | |
5655 bool doHeapRegion(HeapRegion *r) { | |
5656 gclog_or_tty->print("Region: "PTR_FORMAT":", r); | |
5657 if (r != NULL) { | |
5658 if (r->is_on_free_list()) | |
5659 gclog_or_tty->print("Free "); | |
5660 if (r->is_young()) | |
5661 gclog_or_tty->print("Young "); | |
5662 if (r->isHumongous()) | |
5663 gclog_or_tty->print("Is Humongous "); | |
5664 r->print(); | |
5665 } | |
5666 return false; | |
5667 } | |
5668 }; | |
5669 | |
5670 class SortHeapRegionClosure : public HeapRegionClosure { | |
5671 size_t young_regions,free_regions, unclean_regions; | |
5672 size_t hum_regions, count; | |
5673 size_t unaccounted, cur_unclean, cur_alloc; | |
5674 size_t total_free; | |
5675 HeapRegion* cur; | |
5676 public: | |
5677 SortHeapRegionClosure(HeapRegion *_cur) : cur(_cur), young_regions(0), | |
5678 free_regions(0), unclean_regions(0), | |
5679 hum_regions(0), | |
5680 count(0), unaccounted(0), | |
5681 cur_alloc(0), total_free(0) | |
5682 {} | |
5683 bool doHeapRegion(HeapRegion *r) { | |
5684 count++; | |
5685 if (r->is_on_free_list()) free_regions++; | |
5686 else if (r->is_on_unclean_list()) unclean_regions++; | |
5687 else if (r->isHumongous()) hum_regions++; | |
5688 else if (r->is_young()) young_regions++; | |
5689 else if (r == cur) cur_alloc++; | |
5690 else unaccounted++; | |
5691 return false; | |
5692 } | |
5693 void print() { | |
5694 total_free = free_regions + unclean_regions; | |
5695 gclog_or_tty->print("%d regions\n", count); | |
5696 gclog_or_tty->print("%d free: free_list = %d unclean = %d\n", | |
5697 total_free, free_regions, unclean_regions); | |
5698 gclog_or_tty->print("%d humongous %d young\n", | |
5699 hum_regions, young_regions); | |
5700 gclog_or_tty->print("%d cur_alloc\n", cur_alloc); | |
5701 gclog_or_tty->print("UHOH unaccounted = %d\n", unaccounted); | |
5702 } | |
5703 }; | |
5704 | |
5705 void G1CollectedHeap::print_region_counts() { | |
5706 SortHeapRegionClosure sc(_cur_alloc_region); | |
5707 PrintHeapRegionClosure cl; | |
5708 heap_region_iterate(&cl); | |
5709 heap_region_iterate(&sc); | |
5710 sc.print(); | |
5711 print_region_accounting_info(); | |
5712 }; | |
5713 | |
5714 bool G1CollectedHeap::regions_accounted_for() { | |
5715 // TODO: regions accounting for young/survivor/tenured | |
5716 return true; | |
5717 } | |
5718 | |
5719 bool G1CollectedHeap::print_region_accounting_info() { | |
5720 gclog_or_tty->print_cr("P regions: %d.", G1NumPopularRegions); | |
5721 gclog_or_tty->print_cr("Free regions: %d (count: %d count list %d) (clean: %d unclean: %d).", | |
5722 free_regions(), | |
5723 count_free_regions(), count_free_regions_list(), | |
5724 _free_region_list_size, _unclean_region_list.sz()); | |
5725 gclog_or_tty->print_cr("cur_alloc: %d.", | |
5726 (_cur_alloc_region == NULL ? 0 : 1)); | |
5727 gclog_or_tty->print_cr("H regions: %d.", _num_humongous_regions); | |
5728 | |
5729 // TODO: check regions accounting for young/survivor/tenured | |
5730 return true; | |
5731 } | |
5732 | |
5733 bool G1CollectedHeap::is_in_closed_subset(const void* p) const { | |
5734 HeapRegion* hr = heap_region_containing(p); | |
5735 if (hr == NULL) { | |
5736 return is_in_permanent(p); | |
5737 } else { | |
5738 return hr->is_in(p); | |
5739 } | |
5740 } | |
5741 #endif // PRODUCT | |
5742 | |
5743 void G1CollectedHeap::g1_unimplemented() { | |
5744 // Unimplemented(); | |
5745 } | |
5746 | |
5747 | |
5748 // Local Variables: *** | |
5749 // c-indentation-style: gnu *** | |
5750 // End: *** |