Thu, 24 May 2018 17:06:56 +0800
Merge
1 /*
2 * Copyright (c) 2001, 2016, Oracle and/or its affiliates. All rights reserved.
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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "gc_implementation/g1/concurrentG1Refine.hpp"
27 #include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp"
28 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
29 #include "gc_implementation/g1/heapRegionRemSet.hpp"
30 #include "gc_implementation/g1/heapRegionManager.inline.hpp"
31 #include "memory/allocation.hpp"
32 #include "memory/padded.inline.hpp"
33 #include "memory/space.inline.hpp"
34 #include "oops/oop.inline.hpp"
35 #include "utilities/bitMap.inline.hpp"
36 #include "utilities/globalDefinitions.hpp"
37 #include "utilities/growableArray.hpp"
39 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
41 class PerRegionTable: public CHeapObj<mtGC> {
42 friend class OtherRegionsTable;
43 friend class HeapRegionRemSetIterator;
45 HeapRegion* _hr;
46 BitMap _bm;
47 jint _occupied;
49 // next pointer for free/allocated 'all' list
50 PerRegionTable* _next;
52 // prev pointer for the allocated 'all' list
53 PerRegionTable* _prev;
55 // next pointer in collision list
56 PerRegionTable * _collision_list_next;
58 // Global free list of PRTs
59 static PerRegionTable* _free_list;
61 protected:
62 // We need access in order to union things into the base table.
63 BitMap* bm() { return &_bm; }
65 void recount_occupied() {
66 _occupied = (jint) bm()->count_one_bits();
67 }
69 PerRegionTable(HeapRegion* hr) :
70 _hr(hr),
71 _occupied(0),
72 _bm(HeapRegion::CardsPerRegion, false /* in-resource-area */),
73 _collision_list_next(NULL), _next(NULL), _prev(NULL)
74 {}
76 void add_card_work(CardIdx_t from_card, bool par) {
77 if (!_bm.at(from_card)) {
78 if (par) {
79 if (_bm.par_at_put(from_card, 1)) {
80 Atomic::inc(&_occupied);
81 }
82 } else {
83 _bm.at_put(from_card, 1);
84 _occupied++;
85 }
86 }
87 }
89 void add_reference_work(OopOrNarrowOopStar from, bool par) {
90 // Must make this robust in case "from" is not in "_hr", because of
91 // concurrency.
93 if (G1TraceHeapRegionRememberedSet) {
94 gclog_or_tty->print_cr(" PRT::Add_reference_work(" PTR_FORMAT "->" PTR_FORMAT").",
95 from,
96 UseCompressedOops
97 ? (void *)oopDesc::load_decode_heap_oop((narrowOop*)from)
98 : (void *)oopDesc::load_decode_heap_oop((oop*)from));
99 }
101 HeapRegion* loc_hr = hr();
102 // If the test below fails, then this table was reused concurrently
103 // with this operation. This is OK, since the old table was coarsened,
104 // and adding a bit to the new table is never incorrect.
105 // If the table used to belong to a continues humongous region and is
106 // now reused for the corresponding start humongous region, we need to
107 // make sure that we detect this. Thus, we call is_in_reserved_raw()
108 // instead of just is_in_reserved() here.
109 if (loc_hr->is_in_reserved_raw(from)) {
110 size_t hw_offset = pointer_delta((HeapWord*)from, loc_hr->bottom());
111 CardIdx_t from_card = (CardIdx_t)
112 hw_offset >> (CardTableModRefBS::card_shift - LogHeapWordSize);
114 assert(0 <= from_card && (size_t)from_card < HeapRegion::CardsPerRegion,
115 "Must be in range.");
116 add_card_work(from_card, par);
117 }
118 }
120 public:
122 HeapRegion* hr() const {
123 return (HeapRegion*) OrderAccess::load_ptr_acquire(&_hr);
124 }
126 jint occupied() const {
127 // Overkill, but if we ever need it...
128 // guarantee(_occupied == _bm.count_one_bits(), "Check");
129 return _occupied;
130 }
132 void init(HeapRegion* hr, bool clear_links_to_all_list) {
133 if (clear_links_to_all_list) {
134 set_next(NULL);
135 set_prev(NULL);
136 }
137 _collision_list_next = NULL;
138 _occupied = 0;
139 _bm.clear();
140 // Make sure that the bitmap clearing above has been finished before publishing
141 // this PRT to concurrent threads.
142 OrderAccess::release_store_ptr(&_hr, hr);
143 }
145 void add_reference(OopOrNarrowOopStar from) {
146 add_reference_work(from, /*parallel*/ true);
147 }
149 void seq_add_reference(OopOrNarrowOopStar from) {
150 add_reference_work(from, /*parallel*/ false);
151 }
153 void scrub(CardTableModRefBS* ctbs, BitMap* card_bm) {
154 HeapWord* hr_bot = hr()->bottom();
155 size_t hr_first_card_index = ctbs->index_for(hr_bot);
156 bm()->set_intersection_at_offset(*card_bm, hr_first_card_index);
157 recount_occupied();
158 }
160 void add_card(CardIdx_t from_card_index) {
161 add_card_work(from_card_index, /*parallel*/ true);
162 }
164 void seq_add_card(CardIdx_t from_card_index) {
165 add_card_work(from_card_index, /*parallel*/ false);
166 }
168 // (Destructively) union the bitmap of the current table into the given
169 // bitmap (which is assumed to be of the same size.)
170 void union_bitmap_into(BitMap* bm) {
171 bm->set_union(_bm);
172 }
174 // Mem size in bytes.
175 size_t mem_size() const {
176 return sizeof(PerRegionTable) + _bm.size_in_words() * HeapWordSize;
177 }
179 // Requires "from" to be in "hr()".
180 bool contains_reference(OopOrNarrowOopStar from) const {
181 assert(hr()->is_in_reserved(from), "Precondition.");
182 size_t card_ind = pointer_delta(from, hr()->bottom(),
183 CardTableModRefBS::card_size);
184 return _bm.at(card_ind);
185 }
187 // Bulk-free the PRTs from prt to last, assumes that they are
188 // linked together using their _next field.
189 static void bulk_free(PerRegionTable* prt, PerRegionTable* last) {
190 while (true) {
191 PerRegionTable* fl = _free_list;
192 last->set_next(fl);
193 PerRegionTable* res = (PerRegionTable*) Atomic::cmpxchg_ptr(prt, &_free_list, fl);
194 if (res == fl) {
195 return;
196 }
197 }
198 ShouldNotReachHere();
199 }
201 static void free(PerRegionTable* prt) {
202 bulk_free(prt, prt);
203 }
205 // Returns an initialized PerRegionTable instance.
206 static PerRegionTable* alloc(HeapRegion* hr) {
207 PerRegionTable* fl = _free_list;
208 while (fl != NULL) {
209 PerRegionTable* nxt = fl->next();
210 PerRegionTable* res =
211 (PerRegionTable*)
212 Atomic::cmpxchg_ptr(nxt, &_free_list, fl);
213 if (res == fl) {
214 fl->init(hr, true);
215 return fl;
216 } else {
217 fl = _free_list;
218 }
219 }
220 assert(fl == NULL, "Loop condition.");
221 return new PerRegionTable(hr);
222 }
224 PerRegionTable* next() const { return _next; }
225 void set_next(PerRegionTable* next) { _next = next; }
226 PerRegionTable* prev() const { return _prev; }
227 void set_prev(PerRegionTable* prev) { _prev = prev; }
229 // Accessor and Modification routines for the pointer for the
230 // singly linked collision list that links the PRTs within the
231 // OtherRegionsTable::_fine_grain_regions hash table.
232 //
233 // It might be useful to also make the collision list doubly linked
234 // to avoid iteration over the collisions list during scrubbing/deletion.
235 // OTOH there might not be many collisions.
237 PerRegionTable* collision_list_next() const {
238 return _collision_list_next;
239 }
241 void set_collision_list_next(PerRegionTable* next) {
242 _collision_list_next = next;
243 }
245 PerRegionTable** collision_list_next_addr() {
246 return &_collision_list_next;
247 }
249 static size_t fl_mem_size() {
250 PerRegionTable* cur = _free_list;
251 size_t res = 0;
252 while (cur != NULL) {
253 res += cur->mem_size();
254 cur = cur->next();
255 }
256 return res;
257 }
259 static void test_fl_mem_size();
260 };
262 PerRegionTable* PerRegionTable::_free_list = NULL;
264 size_t OtherRegionsTable::_max_fine_entries = 0;
265 size_t OtherRegionsTable::_mod_max_fine_entries_mask = 0;
266 size_t OtherRegionsTable::_fine_eviction_stride = 0;
267 size_t OtherRegionsTable::_fine_eviction_sample_size = 0;
269 OtherRegionsTable::OtherRegionsTable(HeapRegion* hr, Mutex* m) :
270 _g1h(G1CollectedHeap::heap()),
271 _hr(hr), _m(m),
272 _coarse_map(G1CollectedHeap::heap()->max_regions(),
273 false /* in-resource-area */),
274 _fine_grain_regions(NULL),
275 _first_all_fine_prts(NULL), _last_all_fine_prts(NULL),
276 _n_fine_entries(0), _n_coarse_entries(0),
277 _fine_eviction_start(0),
278 _sparse_table(hr)
279 {
280 typedef PerRegionTable* PerRegionTablePtr;
282 if (_max_fine_entries == 0) {
283 assert(_mod_max_fine_entries_mask == 0, "Both or none.");
284 size_t max_entries_log = (size_t)log2_long((jlong)G1RSetRegionEntries);
285 _max_fine_entries = (size_t)1 << max_entries_log;
286 _mod_max_fine_entries_mask = _max_fine_entries - 1;
288 assert(_fine_eviction_sample_size == 0
289 && _fine_eviction_stride == 0, "All init at same time.");
290 _fine_eviction_sample_size = MAX2((size_t)4, max_entries_log);
291 _fine_eviction_stride = _max_fine_entries / _fine_eviction_sample_size;
292 }
294 _fine_grain_regions = NEW_C_HEAP_ARRAY3(PerRegionTablePtr, _max_fine_entries,
295 mtGC, CURRENT_PC, AllocFailStrategy::RETURN_NULL);
297 if (_fine_grain_regions == NULL) {
298 vm_exit_out_of_memory(sizeof(void*)*_max_fine_entries, OOM_MALLOC_ERROR,
299 "Failed to allocate _fine_grain_entries.");
300 }
302 for (size_t i = 0; i < _max_fine_entries; i++) {
303 _fine_grain_regions[i] = NULL;
304 }
305 }
307 void OtherRegionsTable::link_to_all(PerRegionTable* prt) {
308 // We always append to the beginning of the list for convenience;
309 // the order of entries in this list does not matter.
310 if (_first_all_fine_prts != NULL) {
311 assert(_first_all_fine_prts->prev() == NULL, "invariant");
312 _first_all_fine_prts->set_prev(prt);
313 prt->set_next(_first_all_fine_prts);
314 } else {
315 // this is the first element we insert. Adjust the "last" pointer
316 _last_all_fine_prts = prt;
317 assert(prt->next() == NULL, "just checking");
318 }
319 // the new element is always the first element without a predecessor
320 prt->set_prev(NULL);
321 _first_all_fine_prts = prt;
323 assert(prt->prev() == NULL, "just checking");
324 assert(_first_all_fine_prts == prt, "just checking");
325 assert((_first_all_fine_prts == NULL && _last_all_fine_prts == NULL) ||
326 (_first_all_fine_prts != NULL && _last_all_fine_prts != NULL),
327 "just checking");
328 assert(_last_all_fine_prts == NULL || _last_all_fine_prts->next() == NULL,
329 "just checking");
330 assert(_first_all_fine_prts == NULL || _first_all_fine_prts->prev() == NULL,
331 "just checking");
332 }
334 void OtherRegionsTable::unlink_from_all(PerRegionTable* prt) {
335 if (prt->prev() != NULL) {
336 assert(_first_all_fine_prts != prt, "just checking");
337 prt->prev()->set_next(prt->next());
338 // removing the last element in the list?
339 if (_last_all_fine_prts == prt) {
340 _last_all_fine_prts = prt->prev();
341 }
342 } else {
343 assert(_first_all_fine_prts == prt, "just checking");
344 _first_all_fine_prts = prt->next();
345 // list is empty now?
346 if (_first_all_fine_prts == NULL) {
347 _last_all_fine_prts = NULL;
348 }
349 }
351 if (prt->next() != NULL) {
352 prt->next()->set_prev(prt->prev());
353 }
355 prt->set_next(NULL);
356 prt->set_prev(NULL);
358 assert((_first_all_fine_prts == NULL && _last_all_fine_prts == NULL) ||
359 (_first_all_fine_prts != NULL && _last_all_fine_prts != NULL),
360 "just checking");
361 assert(_last_all_fine_prts == NULL || _last_all_fine_prts->next() == NULL,
362 "just checking");
363 assert(_first_all_fine_prts == NULL || _first_all_fine_prts->prev() == NULL,
364 "just checking");
365 }
367 int** FromCardCache::_cache = NULL;
368 uint FromCardCache::_max_regions = 0;
369 size_t FromCardCache::_static_mem_size = 0;
371 void FromCardCache::initialize(uint n_par_rs, uint max_num_regions) {
372 guarantee(_cache == NULL, "Should not call this multiple times");
374 _max_regions = max_num_regions;
375 _cache = Padded2DArray<int, mtGC>::create_unfreeable(n_par_rs,
376 _max_regions,
377 &_static_mem_size);
379 invalidate(0, _max_regions);
380 }
382 void FromCardCache::invalidate(uint start_idx, size_t new_num_regions) {
383 guarantee((size_t)start_idx + new_num_regions <= max_uintx,
384 err_msg("Trying to invalidate beyond maximum region, from %u size "SIZE_FORMAT,
385 start_idx, new_num_regions));
386 for (uint i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) {
387 uint end_idx = (start_idx + (uint)new_num_regions);
388 assert(end_idx <= _max_regions, "Must be within max.");
389 for (uint j = start_idx; j < end_idx; j++) {
390 set(i, j, InvalidCard);
391 }
392 }
393 }
395 #ifndef PRODUCT
396 void FromCardCache::print(outputStream* out) {
397 for (uint i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) {
398 for (uint j = 0; j < _max_regions; j++) {
399 out->print_cr("_from_card_cache["UINT32_FORMAT"]["UINT32_FORMAT"] = "INT32_FORMAT".",
400 i, j, at(i, j));
401 }
402 }
403 }
404 #endif
406 void FromCardCache::clear(uint region_idx) {
407 uint num_par_remsets = HeapRegionRemSet::num_par_rem_sets();
408 for (uint i = 0; i < num_par_remsets; i++) {
409 set(i, region_idx, InvalidCard);
410 }
411 }
413 void OtherRegionsTable::initialize(uint max_regions) {
414 FromCardCache::initialize(HeapRegionRemSet::num_par_rem_sets(), max_regions);
415 }
417 void OtherRegionsTable::invalidate(uint start_idx, size_t num_regions) {
418 FromCardCache::invalidate(start_idx, num_regions);
419 }
421 void OtherRegionsTable::print_from_card_cache() {
422 FromCardCache::print();
423 }
425 void OtherRegionsTable::add_reference(OopOrNarrowOopStar from, int tid) {
426 uint cur_hrm_ind = hr()->hrm_index();
428 if (G1TraceHeapRegionRememberedSet) {
429 gclog_or_tty->print_cr("ORT::add_reference_work(" PTR_FORMAT "->" PTR_FORMAT ").",
430 from,
431 UseCompressedOops
432 ? (void *)oopDesc::load_decode_heap_oop((narrowOop*)from)
433 : (void *)oopDesc::load_decode_heap_oop((oop*)from));
434 }
436 int from_card = (int)(uintptr_t(from) >> CardTableModRefBS::card_shift);
438 if (G1TraceHeapRegionRememberedSet) {
439 gclog_or_tty->print_cr("Table for [" PTR_FORMAT "...): card %d (cache = "INT32_FORMAT")",
440 hr()->bottom(), from_card,
441 FromCardCache::at((uint)tid, cur_hrm_ind));
442 }
444 if (FromCardCache::contains_or_replace((uint)tid, cur_hrm_ind, from_card)) {
445 if (G1TraceHeapRegionRememberedSet) {
446 gclog_or_tty->print_cr(" from-card cache hit.");
447 }
448 assert(contains_reference(from), err_msg("We just found " PTR_FORMAT " in the FromCardCache", from));
449 return;
450 }
452 // Note that this may be a continued H region.
453 HeapRegion* from_hr = _g1h->heap_region_containing_raw(from);
454 RegionIdx_t from_hrm_ind = (RegionIdx_t) from_hr->hrm_index();
456 // If the region is already coarsened, return.
457 if (_coarse_map.at(from_hrm_ind)) {
458 if (G1TraceHeapRegionRememberedSet) {
459 gclog_or_tty->print_cr(" coarse map hit.");
460 }
461 assert(contains_reference(from), err_msg("We just found " PTR_FORMAT " in the Coarse table", from));
462 return;
463 }
465 // Otherwise find a per-region table to add it to.
466 size_t ind = from_hrm_ind & _mod_max_fine_entries_mask;
467 PerRegionTable* prt = find_region_table(ind, from_hr);
468 if (prt == NULL) {
469 MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag);
470 // Confirm that it's really not there...
471 prt = find_region_table(ind, from_hr);
472 if (prt == NULL) {
474 uintptr_t from_hr_bot_card_index =
475 uintptr_t(from_hr->bottom())
476 >> CardTableModRefBS::card_shift;
477 CardIdx_t card_index = from_card - from_hr_bot_card_index;
478 assert(0 <= card_index && (size_t)card_index < HeapRegion::CardsPerRegion,
479 "Must be in range.");
480 if (G1HRRSUseSparseTable &&
481 _sparse_table.add_card(from_hrm_ind, card_index)) {
482 if (G1RecordHRRSOops) {
483 HeapRegionRemSet::record(hr(), from);
484 if (G1TraceHeapRegionRememberedSet) {
485 gclog_or_tty->print(" Added card " PTR_FORMAT " to region "
486 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n",
487 align_size_down(uintptr_t(from),
488 CardTableModRefBS::card_size),
489 hr()->bottom(), from);
490 }
491 }
492 if (G1TraceHeapRegionRememberedSet) {
493 gclog_or_tty->print_cr(" added card to sparse table.");
494 }
495 assert(contains_reference_locked(from), err_msg("We just added " PTR_FORMAT " to the Sparse table", from));
496 return;
497 } else {
498 if (G1TraceHeapRegionRememberedSet) {
499 gclog_or_tty->print_cr(" [tid %d] sparse table entry "
500 "overflow(f: %d, t: %u)",
501 tid, from_hrm_ind, cur_hrm_ind);
502 }
503 }
505 if (_n_fine_entries == _max_fine_entries) {
506 prt = delete_region_table();
507 // There is no need to clear the links to the 'all' list here:
508 // prt will be reused immediately, i.e. remain in the 'all' list.
509 prt->init(from_hr, false /* clear_links_to_all_list */);
510 } else {
511 prt = PerRegionTable::alloc(from_hr);
512 link_to_all(prt);
513 }
515 PerRegionTable* first_prt = _fine_grain_regions[ind];
516 prt->set_collision_list_next(first_prt);
517 _fine_grain_regions[ind] = prt;
518 _n_fine_entries++;
520 if (G1HRRSUseSparseTable) {
521 // Transfer from sparse to fine-grain.
522 SparsePRTEntry *sprt_entry = _sparse_table.get_entry(from_hrm_ind);
523 assert(sprt_entry != NULL, "There should have been an entry");
524 for (int i = 0; i < SparsePRTEntry::cards_num(); i++) {
525 CardIdx_t c = sprt_entry->card(i);
526 if (c != SparsePRTEntry::NullEntry) {
527 prt->add_card(c);
528 }
529 }
530 // Now we can delete the sparse entry.
531 bool res = _sparse_table.delete_entry(from_hrm_ind);
532 assert(res, "It should have been there.");
533 }
534 }
535 assert(prt != NULL && prt->hr() == from_hr, "consequence");
536 }
537 // Note that we can't assert "prt->hr() == from_hr", because of the
538 // possibility of concurrent reuse. But see head comment of
539 // OtherRegionsTable for why this is OK.
540 assert(prt != NULL, "Inv");
542 prt->add_reference(from);
544 if (G1RecordHRRSOops) {
545 HeapRegionRemSet::record(hr(), from);
546 if (G1TraceHeapRegionRememberedSet) {
547 gclog_or_tty->print("Added card " PTR_FORMAT " to region "
548 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n",
549 align_size_down(uintptr_t(from),
550 CardTableModRefBS::card_size),
551 hr()->bottom(), from);
552 }
553 }
554 assert(contains_reference(from), err_msg("We just added " PTR_FORMAT " to the PRT", from));
555 }
557 PerRegionTable*
558 OtherRegionsTable::find_region_table(size_t ind, HeapRegion* hr) const {
559 assert(0 <= ind && ind < _max_fine_entries, "Preconditions.");
560 PerRegionTable* prt = _fine_grain_regions[ind];
561 while (prt != NULL && prt->hr() != hr) {
562 prt = prt->collision_list_next();
563 }
564 // Loop postcondition is the method postcondition.
565 return prt;
566 }
568 jint OtherRegionsTable::_n_coarsenings = 0;
570 PerRegionTable* OtherRegionsTable::delete_region_table() {
571 assert(_m->owned_by_self(), "Precondition");
572 assert(_n_fine_entries == _max_fine_entries, "Precondition");
573 PerRegionTable* max = NULL;
574 jint max_occ = 0;
575 PerRegionTable** max_prev = NULL;
576 size_t max_ind;
578 size_t i = _fine_eviction_start;
579 for (size_t k = 0; k < _fine_eviction_sample_size; k++) {
580 size_t ii = i;
581 // Make sure we get a non-NULL sample.
582 while (_fine_grain_regions[ii] == NULL) {
583 ii++;
584 if (ii == _max_fine_entries) ii = 0;
585 guarantee(ii != i, "We must find one.");
586 }
587 PerRegionTable** prev = &_fine_grain_regions[ii];
588 PerRegionTable* cur = *prev;
589 while (cur != NULL) {
590 jint cur_occ = cur->occupied();
591 if (max == NULL || cur_occ > max_occ) {
592 max = cur;
593 max_prev = prev;
594 max_ind = i;
595 max_occ = cur_occ;
596 }
597 prev = cur->collision_list_next_addr();
598 cur = cur->collision_list_next();
599 }
600 i = i + _fine_eviction_stride;
601 if (i >= _n_fine_entries) i = i - _n_fine_entries;
602 }
604 _fine_eviction_start++;
606 if (_fine_eviction_start >= _n_fine_entries) {
607 _fine_eviction_start -= _n_fine_entries;
608 }
610 guarantee(max != NULL, "Since _n_fine_entries > 0");
611 guarantee(max_prev != NULL, "Since max != NULL.");
613 // Set the corresponding coarse bit.
614 size_t max_hrm_index = (size_t) max->hr()->hrm_index();
615 if (!_coarse_map.at(max_hrm_index)) {
616 _coarse_map.at_put(max_hrm_index, true);
617 _n_coarse_entries++;
618 if (G1TraceHeapRegionRememberedSet) {
619 gclog_or_tty->print("Coarsened entry in region [" PTR_FORMAT "...] "
620 "for region [" PTR_FORMAT "...] (%d coarse entries).\n",
621 hr()->bottom(),
622 max->hr()->bottom(),
623 _n_coarse_entries);
624 }
625 }
627 // Unsplice.
628 *max_prev = max->collision_list_next();
629 Atomic::inc(&_n_coarsenings);
630 _n_fine_entries--;
631 return max;
632 }
635 // At present, this must be called stop-world single-threaded.
636 void OtherRegionsTable::scrub(CardTableModRefBS* ctbs,
637 BitMap* region_bm, BitMap* card_bm) {
638 // First eliminated garbage regions from the coarse map.
639 if (G1RSScrubVerbose) {
640 gclog_or_tty->print_cr("Scrubbing region %u:", hr()->hrm_index());
641 }
643 assert(_coarse_map.size() == region_bm->size(), "Precondition");
644 if (G1RSScrubVerbose) {
645 gclog_or_tty->print(" Coarse map: before = "SIZE_FORMAT"...",
646 _n_coarse_entries);
647 }
648 _coarse_map.set_intersection(*region_bm);
649 _n_coarse_entries = _coarse_map.count_one_bits();
650 if (G1RSScrubVerbose) {
651 gclog_or_tty->print_cr(" after = "SIZE_FORMAT".", _n_coarse_entries);
652 }
654 // Now do the fine-grained maps.
655 for (size_t i = 0; i < _max_fine_entries; i++) {
656 PerRegionTable* cur = _fine_grain_regions[i];
657 PerRegionTable** prev = &_fine_grain_regions[i];
658 while (cur != NULL) {
659 PerRegionTable* nxt = cur->collision_list_next();
660 // If the entire region is dead, eliminate.
661 if (G1RSScrubVerbose) {
662 gclog_or_tty->print_cr(" For other region %u:",
663 cur->hr()->hrm_index());
664 }
665 if (!region_bm->at((size_t) cur->hr()->hrm_index())) {
666 *prev = nxt;
667 cur->set_collision_list_next(NULL);
668 _n_fine_entries--;
669 if (G1RSScrubVerbose) {
670 gclog_or_tty->print_cr(" deleted via region map.");
671 }
672 unlink_from_all(cur);
673 PerRegionTable::free(cur);
674 } else {
675 // Do fine-grain elimination.
676 if (G1RSScrubVerbose) {
677 gclog_or_tty->print(" occ: before = %4d.", cur->occupied());
678 }
679 cur->scrub(ctbs, card_bm);
680 if (G1RSScrubVerbose) {
681 gclog_or_tty->print_cr(" after = %4d.", cur->occupied());
682 }
683 // Did that empty the table completely?
684 if (cur->occupied() == 0) {
685 *prev = nxt;
686 cur->set_collision_list_next(NULL);
687 _n_fine_entries--;
688 unlink_from_all(cur);
689 PerRegionTable::free(cur);
690 } else {
691 prev = cur->collision_list_next_addr();
692 }
693 }
694 cur = nxt;
695 }
696 }
697 // Since we may have deleted a from_card_cache entry from the RS, clear
698 // the FCC.
699 clear_fcc();
700 }
702 bool OtherRegionsTable::occupancy_less_or_equal_than(size_t limit) const {
703 if (limit <= (size_t)G1RSetSparseRegionEntries) {
704 return occ_coarse() == 0 && _first_all_fine_prts == NULL && occ_sparse() <= limit;
705 } else {
706 // Current uses of this method may only use values less than G1RSetSparseRegionEntries
707 // for the limit. The solution, comparing against occupied() would be too slow
708 // at this time.
709 Unimplemented();
710 return false;
711 }
712 }
714 bool OtherRegionsTable::is_empty() const {
715 return occ_sparse() == 0 && occ_coarse() == 0 && _first_all_fine_prts == NULL;
716 }
718 size_t OtherRegionsTable::occupied() const {
719 size_t sum = occ_fine();
720 sum += occ_sparse();
721 sum += occ_coarse();
722 return sum;
723 }
725 size_t OtherRegionsTable::occ_fine() const {
726 size_t sum = 0;
728 size_t num = 0;
729 PerRegionTable * cur = _first_all_fine_prts;
730 while (cur != NULL) {
731 sum += cur->occupied();
732 cur = cur->next();
733 num++;
734 }
735 guarantee(num == _n_fine_entries, "just checking");
736 return sum;
737 }
739 size_t OtherRegionsTable::occ_coarse() const {
740 return (_n_coarse_entries * HeapRegion::CardsPerRegion);
741 }
743 size_t OtherRegionsTable::occ_sparse() const {
744 return _sparse_table.occupied();
745 }
747 size_t OtherRegionsTable::mem_size() const {
748 size_t sum = 0;
749 // all PRTs are of the same size so it is sufficient to query only one of them.
750 if (_first_all_fine_prts != NULL) {
751 assert(_last_all_fine_prts != NULL &&
752 _first_all_fine_prts->mem_size() == _last_all_fine_prts->mem_size(), "check that mem_size() is constant");
753 sum += _first_all_fine_prts->mem_size() * _n_fine_entries;
754 }
755 sum += (sizeof(PerRegionTable*) * _max_fine_entries);
756 sum += (_coarse_map.size_in_words() * HeapWordSize);
757 sum += (_sparse_table.mem_size());
758 sum += sizeof(OtherRegionsTable) - sizeof(_sparse_table); // Avoid double counting above.
759 return sum;
760 }
762 size_t OtherRegionsTable::static_mem_size() {
763 return FromCardCache::static_mem_size();
764 }
766 size_t OtherRegionsTable::fl_mem_size() {
767 return PerRegionTable::fl_mem_size();
768 }
770 void OtherRegionsTable::clear_fcc() {
771 FromCardCache::clear(hr()->hrm_index());
772 }
774 void OtherRegionsTable::clear() {
775 // if there are no entries, skip this step
776 if (_first_all_fine_prts != NULL) {
777 guarantee(_first_all_fine_prts != NULL && _last_all_fine_prts != NULL, "just checking");
778 PerRegionTable::bulk_free(_first_all_fine_prts, _last_all_fine_prts);
779 memset(_fine_grain_regions, 0, _max_fine_entries * sizeof(_fine_grain_regions[0]));
780 } else {
781 guarantee(_first_all_fine_prts == NULL && _last_all_fine_prts == NULL, "just checking");
782 }
784 _first_all_fine_prts = _last_all_fine_prts = NULL;
785 _sparse_table.clear();
786 _coarse_map.clear();
787 _n_fine_entries = 0;
788 _n_coarse_entries = 0;
790 clear_fcc();
791 }
793 bool OtherRegionsTable::del_single_region_table(size_t ind,
794 HeapRegion* hr) {
795 assert(0 <= ind && ind < _max_fine_entries, "Preconditions.");
796 PerRegionTable** prev_addr = &_fine_grain_regions[ind];
797 PerRegionTable* prt = *prev_addr;
798 while (prt != NULL && prt->hr() != hr) {
799 prev_addr = prt->collision_list_next_addr();
800 prt = prt->collision_list_next();
801 }
802 if (prt != NULL) {
803 assert(prt->hr() == hr, "Loop postcondition.");
804 *prev_addr = prt->collision_list_next();
805 unlink_from_all(prt);
806 PerRegionTable::free(prt);
807 _n_fine_entries--;
808 return true;
809 } else {
810 return false;
811 }
812 }
814 bool OtherRegionsTable::contains_reference(OopOrNarrowOopStar from) const {
815 // Cast away const in this case.
816 MutexLockerEx x((Mutex*)_m, Mutex::_no_safepoint_check_flag);
817 return contains_reference_locked(from);
818 }
820 bool OtherRegionsTable::contains_reference_locked(OopOrNarrowOopStar from) const {
821 HeapRegion* hr = _g1h->heap_region_containing_raw(from);
822 RegionIdx_t hr_ind = (RegionIdx_t) hr->hrm_index();
823 // Is this region in the coarse map?
824 if (_coarse_map.at(hr_ind)) return true;
826 PerRegionTable* prt = find_region_table(hr_ind & _mod_max_fine_entries_mask,
827 hr);
828 if (prt != NULL) {
829 return prt->contains_reference(from);
831 } else {
832 uintptr_t from_card =
833 (uintptr_t(from) >> CardTableModRefBS::card_shift);
834 uintptr_t hr_bot_card_index =
835 uintptr_t(hr->bottom()) >> CardTableModRefBS::card_shift;
836 assert(from_card >= hr_bot_card_index, "Inv");
837 CardIdx_t card_index = from_card - hr_bot_card_index;
838 assert(0 <= card_index && (size_t)card_index < HeapRegion::CardsPerRegion,
839 "Must be in range.");
840 return _sparse_table.contains_card(hr_ind, card_index);
841 }
842 }
844 void
845 OtherRegionsTable::do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task) {
846 _sparse_table.do_cleanup_work(hrrs_cleanup_task);
847 }
849 // Determines how many threads can add records to an rset in parallel.
850 // This can be done by either mutator threads together with the
851 // concurrent refinement threads or GC threads.
852 uint HeapRegionRemSet::num_par_rem_sets() {
853 return MAX2(DirtyCardQueueSet::num_par_ids() + ConcurrentG1Refine::thread_num(), (uint)ParallelGCThreads);
854 }
856 HeapRegionRemSet::HeapRegionRemSet(G1BlockOffsetSharedArray* bosa,
857 HeapRegion* hr)
858 : _bosa(bosa),
859 _m(Mutex::leaf, FormatBuffer<128>("HeapRegionRemSet lock #%u", hr->hrm_index()), true),
860 _code_roots(), _other_regions(hr, &_m), _iter_state(Unclaimed), _iter_claimed(0) {
861 reset_for_par_iteration();
862 }
864 void HeapRegionRemSet::setup_remset_size() {
865 // Setup sparse and fine-grain tables sizes.
866 // table_size = base * (log(region_size / 1M) + 1)
867 const int LOG_M = 20;
868 int region_size_log_mb = MAX2(HeapRegion::LogOfHRGrainBytes - LOG_M, 0);
869 if (FLAG_IS_DEFAULT(G1RSetSparseRegionEntries)) {
870 G1RSetSparseRegionEntries = G1RSetSparseRegionEntriesBase * (region_size_log_mb + 1);
871 }
872 if (FLAG_IS_DEFAULT(G1RSetRegionEntries)) {
873 G1RSetRegionEntries = G1RSetRegionEntriesBase * (region_size_log_mb + 1);
874 }
875 guarantee(G1RSetSparseRegionEntries > 0 && G1RSetRegionEntries > 0 , "Sanity");
876 }
878 bool HeapRegionRemSet::claim_iter() {
879 if (_iter_state != Unclaimed) return false;
880 jint res = Atomic::cmpxchg(Claimed, (jint*)(&_iter_state), Unclaimed);
881 return (res == Unclaimed);
882 }
884 void HeapRegionRemSet::set_iter_complete() {
885 _iter_state = Complete;
886 }
888 bool HeapRegionRemSet::iter_is_complete() {
889 return _iter_state == Complete;
890 }
892 #ifndef PRODUCT
893 void HeapRegionRemSet::print() {
894 HeapRegionRemSetIterator iter(this);
895 size_t card_index;
896 while (iter.has_next(card_index)) {
897 HeapWord* card_start =
898 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index);
899 gclog_or_tty->print_cr(" Card " PTR_FORMAT, card_start);
900 }
901 if (iter.n_yielded() != occupied()) {
902 gclog_or_tty->print_cr("Yielded disagrees with occupied:");
903 gclog_or_tty->print_cr(" %6d yielded (%6d coarse, %6d fine).",
904 iter.n_yielded(),
905 iter.n_yielded_coarse(), iter.n_yielded_fine());
906 gclog_or_tty->print_cr(" %6d occ (%6d coarse, %6d fine).",
907 occupied(), occ_coarse(), occ_fine());
908 }
909 guarantee(iter.n_yielded() == occupied(),
910 "We should have yielded all the represented cards.");
911 }
912 #endif
914 void HeapRegionRemSet::cleanup() {
915 SparsePRT::cleanup_all();
916 }
918 void HeapRegionRemSet::clear() {
919 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag);
920 clear_locked();
921 }
923 void HeapRegionRemSet::clear_locked() {
924 _code_roots.clear();
925 _other_regions.clear();
926 assert(occupied_locked() == 0, "Should be clear.");
927 reset_for_par_iteration();
928 }
930 void HeapRegionRemSet::reset_for_par_iteration() {
931 _iter_state = Unclaimed;
932 _iter_claimed = 0;
933 // It's good to check this to make sure that the two methods are in sync.
934 assert(verify_ready_for_par_iteration(), "post-condition");
935 }
937 void HeapRegionRemSet::scrub(CardTableModRefBS* ctbs,
938 BitMap* region_bm, BitMap* card_bm) {
939 _other_regions.scrub(ctbs, region_bm, card_bm);
940 }
942 // Code roots support
943 //
944 // The code root set is protected by two separate locking schemes
945 // When at safepoint the per-hrrs lock must be held during modifications
946 // except when doing a full gc.
947 // When not at safepoint the CodeCache_lock must be held during modifications.
948 // When concurrent readers access the contains() function
949 // (during the evacuation phase) no removals are allowed.
951 void HeapRegionRemSet::add_strong_code_root(nmethod* nm) {
952 assert(nm != NULL, "sanity");
953 // Optimistic unlocked contains-check
954 if (!_code_roots.contains(nm)) {
955 MutexLockerEx ml(&_m, Mutex::_no_safepoint_check_flag);
956 add_strong_code_root_locked(nm);
957 }
958 }
960 void HeapRegionRemSet::add_strong_code_root_locked(nmethod* nm) {
961 assert(nm != NULL, "sanity");
962 _code_roots.add(nm);
963 }
965 void HeapRegionRemSet::remove_strong_code_root(nmethod* nm) {
966 assert(nm != NULL, "sanity");
967 assert_locked_or_safepoint(CodeCache_lock);
969 MutexLockerEx ml(CodeCache_lock->owned_by_self() ? NULL : &_m, Mutex::_no_safepoint_check_flag);
970 _code_roots.remove(nm);
972 // Check that there were no duplicates
973 guarantee(!_code_roots.contains(nm), "duplicate entry found");
974 }
976 void HeapRegionRemSet::strong_code_roots_do(CodeBlobClosure* blk) const {
977 _code_roots.nmethods_do(blk);
978 }
980 void HeapRegionRemSet::clean_strong_code_roots(HeapRegion* hr) {
981 _code_roots.clean(hr);
982 }
984 size_t HeapRegionRemSet::strong_code_roots_mem_size() {
985 return _code_roots.mem_size();
986 }
988 HeapRegionRemSetIterator:: HeapRegionRemSetIterator(HeapRegionRemSet* hrrs) :
989 _hrrs(hrrs),
990 _g1h(G1CollectedHeap::heap()),
991 _coarse_map(&hrrs->_other_regions._coarse_map),
992 _bosa(hrrs->bosa()),
993 _is(Sparse),
994 // Set these values so that we increment to the first region.
995 _coarse_cur_region_index(-1),
996 _coarse_cur_region_cur_card(HeapRegion::CardsPerRegion-1),
997 _cur_card_in_prt(HeapRegion::CardsPerRegion),
998 _fine_cur_prt(NULL),
999 _n_yielded_coarse(0),
1000 _n_yielded_fine(0),
1001 _n_yielded_sparse(0),
1002 _sparse_iter(&hrrs->_other_regions._sparse_table) {}
1004 bool HeapRegionRemSetIterator::coarse_has_next(size_t& card_index) {
1005 if (_hrrs->_other_regions._n_coarse_entries == 0) return false;
1006 // Go to the next card.
1007 _coarse_cur_region_cur_card++;
1008 // Was the last the last card in the current region?
1009 if (_coarse_cur_region_cur_card == HeapRegion::CardsPerRegion) {
1010 // Yes: find the next region. This may leave _coarse_cur_region_index
1011 // Set to the last index, in which case there are no more coarse
1012 // regions.
1013 _coarse_cur_region_index =
1014 (int) _coarse_map->get_next_one_offset(_coarse_cur_region_index + 1);
1015 if ((size_t)_coarse_cur_region_index < _coarse_map->size()) {
1016 _coarse_cur_region_cur_card = 0;
1017 HeapWord* r_bot =
1018 _g1h->region_at((uint) _coarse_cur_region_index)->bottom();
1019 _cur_region_card_offset = _bosa->index_for(r_bot);
1020 } else {
1021 return false;
1022 }
1023 }
1024 // If we didn't return false above, then we can yield a card.
1025 card_index = _cur_region_card_offset + _coarse_cur_region_cur_card;
1026 return true;
1027 }
1029 bool HeapRegionRemSetIterator::fine_has_next(size_t& card_index) {
1030 if (fine_has_next()) {
1031 _cur_card_in_prt =
1032 _fine_cur_prt->_bm.get_next_one_offset(_cur_card_in_prt + 1);
1033 }
1034 if (_cur_card_in_prt == HeapRegion::CardsPerRegion) {
1035 // _fine_cur_prt may still be NULL in case if there are not PRTs at all for
1036 // the remembered set.
1037 if (_fine_cur_prt == NULL || _fine_cur_prt->next() == NULL) {
1038 return false;
1039 }
1040 PerRegionTable* next_prt = _fine_cur_prt->next();
1041 switch_to_prt(next_prt);
1042 _cur_card_in_prt = _fine_cur_prt->_bm.get_next_one_offset(_cur_card_in_prt + 1);
1043 }
1045 card_index = _cur_region_card_offset + _cur_card_in_prt;
1046 guarantee(_cur_card_in_prt < HeapRegion::CardsPerRegion,
1047 err_msg("Card index "SIZE_FORMAT" must be within the region", _cur_card_in_prt));
1048 return true;
1049 }
1051 bool HeapRegionRemSetIterator::fine_has_next() {
1052 return _cur_card_in_prt != HeapRegion::CardsPerRegion;
1053 }
1055 void HeapRegionRemSetIterator::switch_to_prt(PerRegionTable* prt) {
1056 assert(prt != NULL, "Cannot switch to NULL prt");
1057 _fine_cur_prt = prt;
1059 HeapWord* r_bot = _fine_cur_prt->hr()->bottom();
1060 _cur_region_card_offset = _bosa->index_for(r_bot);
1062 // The bitmap scan for the PRT always scans from _cur_region_cur_card + 1.
1063 // To avoid special-casing this start case, and not miss the first bitmap
1064 // entry, initialize _cur_region_cur_card with -1 instead of 0.
1065 _cur_card_in_prt = (size_t)-1;
1066 }
1068 bool HeapRegionRemSetIterator::has_next(size_t& card_index) {
1069 switch (_is) {
1070 case Sparse: {
1071 if (_sparse_iter.has_next(card_index)) {
1072 _n_yielded_sparse++;
1073 return true;
1074 }
1075 // Otherwise, deliberate fall-through
1076 _is = Fine;
1077 PerRegionTable* initial_fine_prt = _hrrs->_other_regions._first_all_fine_prts;
1078 if (initial_fine_prt != NULL) {
1079 switch_to_prt(_hrrs->_other_regions._first_all_fine_prts);
1080 }
1081 }
1082 case Fine:
1083 if (fine_has_next(card_index)) {
1084 _n_yielded_fine++;
1085 return true;
1086 }
1087 // Otherwise, deliberate fall-through
1088 _is = Coarse;
1089 case Coarse:
1090 if (coarse_has_next(card_index)) {
1091 _n_yielded_coarse++;
1092 return true;
1093 }
1094 // Otherwise...
1095 break;
1096 }
1097 assert(ParallelGCThreads > 1 ||
1098 n_yielded() == _hrrs->occupied(),
1099 "Should have yielded all the cards in the rem set "
1100 "(in the non-par case).");
1101 return false;
1102 }
1106 OopOrNarrowOopStar* HeapRegionRemSet::_recorded_oops = NULL;
1107 HeapWord** HeapRegionRemSet::_recorded_cards = NULL;
1108 HeapRegion** HeapRegionRemSet::_recorded_regions = NULL;
1109 int HeapRegionRemSet::_n_recorded = 0;
1111 HeapRegionRemSet::Event* HeapRegionRemSet::_recorded_events = NULL;
1112 int* HeapRegionRemSet::_recorded_event_index = NULL;
1113 int HeapRegionRemSet::_n_recorded_events = 0;
1115 void HeapRegionRemSet::record(HeapRegion* hr, OopOrNarrowOopStar f) {
1116 if (_recorded_oops == NULL) {
1117 assert(_n_recorded == 0
1118 && _recorded_cards == NULL
1119 && _recorded_regions == NULL,
1120 "Inv");
1121 _recorded_oops = NEW_C_HEAP_ARRAY(OopOrNarrowOopStar, MaxRecorded, mtGC);
1122 _recorded_cards = NEW_C_HEAP_ARRAY(HeapWord*, MaxRecorded, mtGC);
1123 _recorded_regions = NEW_C_HEAP_ARRAY(HeapRegion*, MaxRecorded, mtGC);
1124 }
1125 if (_n_recorded == MaxRecorded) {
1126 gclog_or_tty->print_cr("Filled up 'recorded' (%d).", MaxRecorded);
1127 } else {
1128 _recorded_cards[_n_recorded] =
1129 (HeapWord*)align_size_down(uintptr_t(f),
1130 CardTableModRefBS::card_size);
1131 _recorded_oops[_n_recorded] = f;
1132 _recorded_regions[_n_recorded] = hr;
1133 _n_recorded++;
1134 }
1135 }
1137 void HeapRegionRemSet::record_event(Event evnt) {
1138 if (!G1RecordHRRSEvents) return;
1140 if (_recorded_events == NULL) {
1141 assert(_n_recorded_events == 0
1142 && _recorded_event_index == NULL,
1143 "Inv");
1144 _recorded_events = NEW_C_HEAP_ARRAY(Event, MaxRecordedEvents, mtGC);
1145 _recorded_event_index = NEW_C_HEAP_ARRAY(int, MaxRecordedEvents, mtGC);
1146 }
1147 if (_n_recorded_events == MaxRecordedEvents) {
1148 gclog_or_tty->print_cr("Filled up 'recorded_events' (%d).", MaxRecordedEvents);
1149 } else {
1150 _recorded_events[_n_recorded_events] = evnt;
1151 _recorded_event_index[_n_recorded_events] = _n_recorded;
1152 _n_recorded_events++;
1153 }
1154 }
1156 void HeapRegionRemSet::print_event(outputStream* str, Event evnt) {
1157 switch (evnt) {
1158 case Event_EvacStart:
1159 str->print("Evac Start");
1160 break;
1161 case Event_EvacEnd:
1162 str->print("Evac End");
1163 break;
1164 case Event_RSUpdateEnd:
1165 str->print("RS Update End");
1166 break;
1167 }
1168 }
1170 void HeapRegionRemSet::print_recorded() {
1171 int cur_evnt = 0;
1172 Event cur_evnt_kind = Event_illegal;
1173 int cur_evnt_ind = 0;
1174 if (_n_recorded_events > 0) {
1175 cur_evnt_kind = _recorded_events[cur_evnt];
1176 cur_evnt_ind = _recorded_event_index[cur_evnt];
1177 }
1179 for (int i = 0; i < _n_recorded; i++) {
1180 while (cur_evnt < _n_recorded_events && i == cur_evnt_ind) {
1181 gclog_or_tty->print("Event: ");
1182 print_event(gclog_or_tty, cur_evnt_kind);
1183 gclog_or_tty->cr();
1184 cur_evnt++;
1185 if (cur_evnt < MaxRecordedEvents) {
1186 cur_evnt_kind = _recorded_events[cur_evnt];
1187 cur_evnt_ind = _recorded_event_index[cur_evnt];
1188 }
1189 }
1190 gclog_or_tty->print("Added card " PTR_FORMAT " to region [" PTR_FORMAT "...]"
1191 " for ref " PTR_FORMAT ".\n",
1192 _recorded_cards[i], _recorded_regions[i]->bottom(),
1193 _recorded_oops[i]);
1194 }
1195 }
1197 void HeapRegionRemSet::reset_for_cleanup_tasks() {
1198 SparsePRT::reset_for_cleanup_tasks();
1199 }
1201 void HeapRegionRemSet::do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task) {
1202 _other_regions.do_cleanup_work(hrrs_cleanup_task);
1203 }
1205 void
1206 HeapRegionRemSet::finish_cleanup_task(HRRSCleanupTask* hrrs_cleanup_task) {
1207 SparsePRT::finish_cleanup_task(hrrs_cleanup_task);
1208 }
1210 #ifndef PRODUCT
1211 void PerRegionTable::test_fl_mem_size() {
1212 PerRegionTable* dummy = alloc(NULL);
1214 size_t min_prt_size = sizeof(void*) + dummy->bm()->size_in_words() * HeapWordSize;
1215 assert(dummy->mem_size() > min_prt_size,
1216 err_msg("PerRegionTable memory usage is suspiciously small, only has "SIZE_FORMAT" bytes. "
1217 "Should be at least "SIZE_FORMAT" bytes.", dummy->mem_size(), min_prt_size));
1218 free(dummy);
1219 guarantee(dummy->mem_size() == fl_mem_size(), "fl_mem_size() does not return the correct element size");
1220 // try to reset the state
1221 _free_list = NULL;
1222 delete dummy;
1223 }
1225 void HeapRegionRemSet::test_prt() {
1226 PerRegionTable::test_fl_mem_size();
1227 }
1229 void HeapRegionRemSet::test() {
1230 os::sleep(Thread::current(), (jlong)5000, false);
1231 G1CollectedHeap* g1h = G1CollectedHeap::heap();
1233 // Run with "-XX:G1LogRSetRegionEntries=2", so that 1 and 5 end up in same
1234 // hash bucket.
1235 HeapRegion* hr0 = g1h->region_at(0);
1236 HeapRegion* hr1 = g1h->region_at(1);
1237 HeapRegion* hr2 = g1h->region_at(5);
1238 HeapRegion* hr3 = g1h->region_at(6);
1239 HeapRegion* hr4 = g1h->region_at(7);
1240 HeapRegion* hr5 = g1h->region_at(8);
1242 HeapWord* hr1_start = hr1->bottom();
1243 HeapWord* hr1_mid = hr1_start + HeapRegion::GrainWords/2;
1244 HeapWord* hr1_last = hr1->end() - 1;
1246 HeapWord* hr2_start = hr2->bottom();
1247 HeapWord* hr2_mid = hr2_start + HeapRegion::GrainWords/2;
1248 HeapWord* hr2_last = hr2->end() - 1;
1250 HeapWord* hr3_start = hr3->bottom();
1251 HeapWord* hr3_mid = hr3_start + HeapRegion::GrainWords/2;
1252 HeapWord* hr3_last = hr3->end() - 1;
1254 HeapRegionRemSet* hrrs = hr0->rem_set();
1256 // Make three references from region 0x101...
1257 hrrs->add_reference((OopOrNarrowOopStar)hr1_start);
1258 hrrs->add_reference((OopOrNarrowOopStar)hr1_mid);
1259 hrrs->add_reference((OopOrNarrowOopStar)hr1_last);
1261 hrrs->add_reference((OopOrNarrowOopStar)hr2_start);
1262 hrrs->add_reference((OopOrNarrowOopStar)hr2_mid);
1263 hrrs->add_reference((OopOrNarrowOopStar)hr2_last);
1265 hrrs->add_reference((OopOrNarrowOopStar)hr3_start);
1266 hrrs->add_reference((OopOrNarrowOopStar)hr3_mid);
1267 hrrs->add_reference((OopOrNarrowOopStar)hr3_last);
1269 // Now cause a coarsening.
1270 hrrs->add_reference((OopOrNarrowOopStar)hr4->bottom());
1271 hrrs->add_reference((OopOrNarrowOopStar)hr5->bottom());
1273 // Now, does iteration yield these three?
1274 HeapRegionRemSetIterator iter(hrrs);
1275 size_t sum = 0;
1276 size_t card_index;
1277 while (iter.has_next(card_index)) {
1278 HeapWord* card_start =
1279 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index);
1280 gclog_or_tty->print_cr(" Card " PTR_FORMAT ".", card_start);
1281 sum++;
1282 }
1283 guarantee(sum == 11 - 3 + 2048, "Failure");
1284 guarantee(sum == hrrs->occupied(), "Failure");
1285 }
1286 #endif