1 /*
2 * Copyright (c) 2012, 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 */
24
25 #include "precompiled.hpp"
26 #include "runtime/mutexLocker.hpp"
27 #include "utilities/decoder.hpp"
28 #include "services/memBaseline.hpp"
29 #include "services/memPtr.hpp"
30 #include "services/memPtrArray.hpp"
31 #include "services/memSnapshot.hpp"
32 #include "services/memTracker.hpp"
33
34 #ifdef ASSERT
35
36 void decode_pointer_record(MemPointerRecord* rec) {
37 tty->print("Pointer: [" PTR_FORMAT " - " PTR_FORMAT "] size = %d bytes", rec->addr(),
38 rec->addr() + rec->size(), (int)rec->size());
39 tty->print(" type = %s", MemBaseline::type2name(FLAGS_TO_MEMORY_TYPE(rec->flags())));
40 if (rec->is_vm_pointer()) {
41 if (rec->is_allocation_record()) {
42 tty->print_cr(" (reserve)");
43 } else if (rec->is_commit_record()) {
44 tty->print_cr(" (commit)");
45 } else if (rec->is_uncommit_record()) {
46 tty->print_cr(" (uncommit)");
47 } else if (rec->is_deallocation_record()) {
48 tty->print_cr(" (release)");
49 } else {
50 tty->print_cr(" (tag)");
51 }
52 } else {
53 if (rec->is_arena_memory_record()) {
54 tty->print_cr(" (arena size)");
55 } else if (rec->is_allocation_record()) {
56 tty->print_cr(" (malloc)");
57 } else {
58 tty->print_cr(" (free)");
59 }
60 }
61 if (MemTracker::track_callsite()) {
62 char buf[1024];
63 address pc = ((MemPointerRecordEx*)rec)->pc();
64 if (pc != NULL && os::dll_address_to_function_name(pc, buf, sizeof(buf), NULL)) {
65 tty->print_cr("\tfrom %s", buf);
66 } else {
67 tty->print_cr("\tcould not decode pc = " PTR_FORMAT "", pc);
68 }
69 }
70 }
71
72 void decode_vm_region_record(VMMemRegion* rec) {
73 tty->print("VM Region [" PTR_FORMAT " - " PTR_FORMAT "]", rec->addr(),
74 rec->addr() + rec->size());
75 tty->print(" type = %s", MemBaseline::type2name(FLAGS_TO_MEMORY_TYPE(rec->flags())));
76 if (rec->is_allocation_record()) {
77 tty->print_cr(" (reserved)");
78 } else if (rec->is_commit_record()) {
79 tty->print_cr(" (committed)");
80 } else {
81 ShouldNotReachHere();
82 }
83 if (MemTracker::track_callsite()) {
84 char buf[1024];
85 address pc = ((VMMemRegionEx*)rec)->pc();
86 if (pc != NULL && os::dll_address_to_function_name(pc, buf, sizeof(buf), NULL)) {
87 tty->print_cr("\tfrom %s", buf);
88 } else {
89 tty->print_cr("\tcould not decode pc = " PTR_FORMAT "", pc);
90 }
91
92 }
93 }
94
95 #endif
96
97
98 bool VMMemPointerIterator::insert_record(MemPointerRecord* rec) {
99 VMMemRegionEx new_rec;
100 assert(rec->is_allocation_record() || rec->is_commit_record(),
101 "Sanity check");
102 if (MemTracker::track_callsite()) {
103 new_rec.init((MemPointerRecordEx*)rec);
104 } else {
105 new_rec.init(rec);
106 }
107 return insert(&new_rec);
108 }
109
110 bool VMMemPointerIterator::insert_record_after(MemPointerRecord* rec) {
111 VMMemRegionEx new_rec;
112 assert(rec->is_allocation_record() || rec->is_commit_record(),
113 "Sanity check");
114 if (MemTracker::track_callsite()) {
115 new_rec.init((MemPointerRecordEx*)rec);
116 } else {
117 new_rec.init(rec);
118 }
119 return insert_after(&new_rec);
120 }
121
122 // we don't consolidate reserved regions, since they may be categorized
123 // in different types.
124 bool VMMemPointerIterator::add_reserved_region(MemPointerRecord* rec) {
125 assert(rec->is_allocation_record(), "Sanity check");
126 VMMemRegion* reserved_region = (VMMemRegion*)current();
127
128 // we don't have anything yet
129 if (reserved_region == NULL) {
130 return insert_record(rec);
131 }
132
133 assert(reserved_region->is_reserved_region(), "Sanity check");
134 // duplicated records
135 if (reserved_region->is_same_region(rec)) {
136 return true;
137 }
138 // Overlapping stack regions indicate that a JNI thread failed to
139 // detach from the VM before exiting. This leaks the JavaThread object.
140 if (CheckJNICalls) {
141 guarantee(FLAGS_TO_MEMORY_TYPE(reserved_region->flags()) != mtThreadStack ||
142 !reserved_region->overlaps_region(rec),
143 "Attached JNI thread exited without being detached");
144 }
145 // otherwise, we should not have overlapping reserved regions
146 assert(FLAGS_TO_MEMORY_TYPE(reserved_region->flags()) == mtThreadStack ||
147 reserved_region->base() > rec->addr(), "Just check: locate()");
148 assert(FLAGS_TO_MEMORY_TYPE(reserved_region->flags()) == mtThreadStack ||
149 !reserved_region->overlaps_region(rec), "overlapping reserved regions");
150
151 return insert_record(rec);
152 }
153
154 // we do consolidate committed regions
155 bool VMMemPointerIterator::add_committed_region(MemPointerRecord* rec) {
156 assert(rec->is_commit_record(), "Sanity check");
157 VMMemRegion* reserved_rgn = (VMMemRegion*)current();
158 assert(reserved_rgn->is_reserved_region() && reserved_rgn->contains_region(rec),
159 "Sanity check");
160
161 // thread's native stack is always marked as "committed", ignore
162 // the "commit" operation for creating stack guard pages
163 if (FLAGS_TO_MEMORY_TYPE(reserved_rgn->flags()) == mtThreadStack &&
164 FLAGS_TO_MEMORY_TYPE(rec->flags()) != mtThreadStack) {
165 return true;
166 }
167
168 // if the reserved region has any committed regions
169 VMMemRegion* committed_rgn = (VMMemRegion*)next();
170 while (committed_rgn != NULL && committed_rgn->is_committed_region()) {
171 // duplicated commit records
172 if(committed_rgn->contains_region(rec)) {
173 return true;
174 } else if (committed_rgn->overlaps_region(rec)) {
175 // overlaps front part
176 if (rec->addr() < committed_rgn->addr()) {
177 committed_rgn->expand_region(rec->addr(),
178 committed_rgn->addr() - rec->addr());
179 } else {
180 // overlaps tail part
181 address committed_rgn_end = committed_rgn->addr() +
182 committed_rgn->size();
183 assert(committed_rgn_end < rec->addr() + rec->size(),
184 "overlap tail part");
185 committed_rgn->expand_region(committed_rgn_end,
186 (rec->addr() + rec->size()) - committed_rgn_end);
187 }
188 } else if (committed_rgn->base() + committed_rgn->size() == rec->addr()) {
189 // adjunct each other
190 committed_rgn->expand_region(rec->addr(), rec->size());
191 VMMemRegion* next_reg = (VMMemRegion*)next();
192 // see if we can consolidate next committed region
193 if (next_reg != NULL && next_reg->is_committed_region() &&
194 next_reg->base() == committed_rgn->base() + committed_rgn->size()) {
195 committed_rgn->expand_region(next_reg->base(), next_reg->size());
196 // delete merged region
197 remove();
198 }
199 return true;
200 } else if (committed_rgn->base() > rec->addr()) {
201 // found the location, insert this committed region
202 return insert_record(rec);
203 }
204 committed_rgn = (VMMemRegion*)next();
205 }
206 return insert_record(rec);
207 }
208
209 bool VMMemPointerIterator::remove_uncommitted_region(MemPointerRecord* rec) {
210 assert(rec->is_uncommit_record(), "sanity check");
211 VMMemRegion* cur;
212 cur = (VMMemRegion*)current();
213 assert(cur->is_reserved_region() && cur->contains_region(rec),
214 "Sanity check");
215 // thread's native stack is always marked as "committed", ignore
216 // the "commit" operation for creating stack guard pages
217 if (FLAGS_TO_MEMORY_TYPE(cur->flags()) == mtThreadStack &&
218 FLAGS_TO_MEMORY_TYPE(rec->flags()) != mtThreadStack) {
219 return true;
220 }
221
222 cur = (VMMemRegion*)next();
223 while (cur != NULL && cur->is_committed_region()) {
224 // region already uncommitted, must be due to duplicated record
225 if (cur->addr() >= rec->addr() + rec->size()) {
226 break;
227 } else if (cur->contains_region(rec)) {
228 // uncommit whole region
229 if (cur->is_same_region(rec)) {
230 remove();
231 break;
232 } else if (rec->addr() == cur->addr() ||
233 rec->addr() + rec->size() == cur->addr() + cur->size()) {
234 // uncommitted from either end of current memory region.
235 cur->exclude_region(rec->addr(), rec->size());
236 break;
237 } else { // split the committed region and release the middle
238 address high_addr = cur->addr() + cur->size();
239 size_t sz = high_addr - rec->addr();
240 cur->exclude_region(rec->addr(), sz);
241 sz = high_addr - (rec->addr() + rec->size());
242 if (MemTracker::track_callsite()) {
243 MemPointerRecordEx tmp(rec->addr() + rec->size(), cur->flags(), sz,
244 ((VMMemRegionEx*)cur)->pc());
245 return insert_record_after(&tmp);
246 } else {
247 MemPointerRecord tmp(rec->addr() + rec->size(), cur->flags(), sz);
248 return insert_record_after(&tmp);
249 }
250 }
251 }
252 cur = (VMMemRegion*)next();
253 }
254
255 // we may not find committed record due to duplicated records
256 return true;
257 }
258
259 bool VMMemPointerIterator::remove_released_region(MemPointerRecord* rec) {
260 assert(rec->is_deallocation_record(), "Sanity check");
261 VMMemRegion* cur = (VMMemRegion*)current();
262 assert(cur->is_reserved_region() && cur->contains_region(rec),
263 "Sanity check");
264 if (rec->is_same_region(cur)) {
265 // release whole reserved region and all committed regions within the reserved region
266 #ifdef ASSERT
267 address low_addr = cur->addr();
268 address high_addr = low_addr + cur->size();
269 #endif
270 remove();
271 // remove committed regions within the reserved region
272 VMMemRegion* next_region = (VMMemRegion*)current();
273 while (next_region != NULL && next_region->is_committed_region()) {
274 assert(next_region->addr() >= low_addr &&
275 next_region->addr() + next_region->size() <= high_addr,
276 "Range check");
277 remove();
278 next_region = (VMMemRegion*)current();
279 }
280 } else if (rec->addr() == cur->addr() ||
281 rec->addr() + rec->size() == cur->addr() + cur->size()) {
282 // released region is at either end of this region
283 cur->exclude_region(rec->addr(), rec->size());
284 assert(check_reserved_region(), "Integrity check");
285 } else { // split the reserved region and release the middle
286 address high_addr = cur->addr() + cur->size();
287 size_t sz = high_addr - rec->addr();
288 cur->exclude_region(rec->addr(), sz);
289 sz = high_addr - rec->addr() - rec->size();
290 if (MemTracker::track_callsite()) {
291 MemPointerRecordEx tmp(rec->addr() + rec->size(), cur->flags(), sz,
292 ((VMMemRegionEx*)cur)->pc());
293 bool ret = insert_reserved_region(&tmp);
294 assert(!ret || check_reserved_region(), "Integrity check");
295 return ret;
296 } else {
297 MemPointerRecord tmp(rec->addr() + rec->size(), cur->flags(), sz);
298 bool ret = insert_reserved_region(&tmp);
299 assert(!ret || check_reserved_region(), "Integrity check");
300 return ret;
301 }
302 }
303 return true;
304 }
305
306 bool VMMemPointerIterator::insert_reserved_region(MemPointerRecord* rec) {
307 // skip all 'commit' records associated with previous reserved region
308 VMMemRegion* p = (VMMemRegion*)next();
309 while (p != NULL && p->is_committed_region() &&
310 p->base() + p->size() < rec->addr()) {
311 p = (VMMemRegion*)next();
312 }
313 return insert_record(rec);
314 }
315
316 bool VMMemPointerIterator::split_reserved_region(VMMemRegion* rgn, address new_rgn_addr, size_t new_rgn_size) {
317 assert(rgn->contains_region(new_rgn_addr, new_rgn_size), "Not fully contained");
318 address pc = (MemTracker::track_callsite() ? ((VMMemRegionEx*)rgn)->pc() : NULL);
319 if (rgn->base() == new_rgn_addr) { // new region is at the beginning of the region
320 size_t sz = rgn->size() - new_rgn_size;
321 // the original region becomes 'new' region
322 rgn->exclude_region(new_rgn_addr + new_rgn_size, sz);
323 // remaining becomes next region
324 MemPointerRecordEx next_rgn(new_rgn_addr + new_rgn_size, rgn->flags(), sz, pc);
325 return insert_reserved_region(&next_rgn);
326 } else if (rgn->base() + rgn->size() == new_rgn_addr + new_rgn_size) {
327 rgn->exclude_region(new_rgn_addr, new_rgn_size);
328 MemPointerRecordEx next_rgn(new_rgn_addr, rgn->flags(), new_rgn_size, pc);
329 return insert_reserved_region(&next_rgn);
330 } else {
331 // the orginal region will be split into three
332 address rgn_high_addr = rgn->base() + rgn->size();
333 // first region
334 rgn->exclude_region(new_rgn_addr, (rgn_high_addr - new_rgn_addr));
335 // the second region is the new region
336 MemPointerRecordEx new_rgn(new_rgn_addr, rgn->flags(), new_rgn_size, pc);
337 if (!insert_reserved_region(&new_rgn)) return false;
338 // the remaining region
339 MemPointerRecordEx rem_rgn(new_rgn_addr + new_rgn_size, rgn->flags(),
340 rgn_high_addr - (new_rgn_addr + new_rgn_size), pc);
341 return insert_reserved_region(&rem_rgn);
342 }
343 }
344
345 static int sort_in_seq_order(const void* p1, const void* p2) {
346 assert(p1 != NULL && p2 != NULL, "Sanity check");
347 const MemPointerRecord* mp1 = (MemPointerRecord*)p1;
348 const MemPointerRecord* mp2 = (MemPointerRecord*)p2;
349 return (mp1->seq() - mp2->seq());
350 }
351
352 bool StagingArea::init() {
353 if (MemTracker::track_callsite()) {
354 _malloc_data = new (std::nothrow)MemPointerArrayImpl<SeqMemPointerRecordEx>();
355 _vm_data = new (std::nothrow)MemPointerArrayImpl<SeqMemPointerRecordEx>();
356 } else {
357 _malloc_data = new (std::nothrow)MemPointerArrayImpl<SeqMemPointerRecord>();
358 _vm_data = new (std::nothrow)MemPointerArrayImpl<SeqMemPointerRecord>();
359 }
360
361 if (_malloc_data != NULL && _vm_data != NULL &&
362 !_malloc_data->out_of_memory() &&
363 !_vm_data->out_of_memory()) {
364 return true;
365 } else {
366 if (_malloc_data != NULL) delete _malloc_data;
367 if (_vm_data != NULL) delete _vm_data;
368 _malloc_data = NULL;
369 _vm_data = NULL;
370 return false;
371 }
372 }
373
374
375 VMRecordIterator StagingArea::virtual_memory_record_walker() {
376 MemPointerArray* arr = vm_data();
377 // sort into seq number order
378 arr->sort((FN_SORT)sort_in_seq_order);
379 return VMRecordIterator(arr);
380 }
381
382
383 MemSnapshot::MemSnapshot() {
384 if (MemTracker::track_callsite()) {
385 _alloc_ptrs = new (std::nothrow) MemPointerArrayImpl<MemPointerRecordEx>();
386 _vm_ptrs = new (std::nothrow)MemPointerArrayImpl<VMMemRegionEx>(64, true);
387 } else {
388 _alloc_ptrs = new (std::nothrow) MemPointerArrayImpl<MemPointerRecord>();
389 _vm_ptrs = new (std::nothrow)MemPointerArrayImpl<VMMemRegion>(64, true);
390 }
391
392 _staging_area.init();
393 _lock = new (std::nothrow) Mutex(Monitor::max_nonleaf - 1, "memSnapshotLock");
394 NOT_PRODUCT(_untracked_count = 0;)
395 _number_of_classes = 0;
396 }
397
398 MemSnapshot::~MemSnapshot() {
399 assert(MemTracker::shutdown_in_progress(), "native memory tracking still on");
400 {
401 MutexLockerEx locker(_lock);
402 if (_alloc_ptrs != NULL) {
403 delete _alloc_ptrs;
404 _alloc_ptrs = NULL;
405 }
406
407 if (_vm_ptrs != NULL) {
408 delete _vm_ptrs;
409 _vm_ptrs = NULL;
410 }
411 }
412
413 if (_lock != NULL) {
414 delete _lock;
415 _lock = NULL;
416 }
417 }
418
419
420 void MemSnapshot::copy_seq_pointer(MemPointerRecord* dest, const MemPointerRecord* src) {
421 assert(dest != NULL && src != NULL, "Just check");
422 assert(dest->addr() == src->addr(), "Just check");
423 assert(dest->seq() > 0 && src->seq() > 0, "not sequenced");
424
425 if (MemTracker::track_callsite()) {
426 *(SeqMemPointerRecordEx*)dest = *(SeqMemPointerRecordEx*)src;
427 } else {
428 *(SeqMemPointerRecord*)dest = *(SeqMemPointerRecord*)src;
429 }
430 }
431
432 void MemSnapshot::assign_pointer(MemPointerRecord*dest, const MemPointerRecord* src) {
433 assert(src != NULL && dest != NULL, "Just check");
434 assert(dest->seq() == 0 && src->seq() >0, "cast away sequence");
435
436 if (MemTracker::track_callsite()) {
437 *(MemPointerRecordEx*)dest = *(MemPointerRecordEx*)src;
438 } else {
439 *(MemPointerRecord*)dest = *(MemPointerRecord*)src;
440 }
441 }
442
443 // merge a recorder to the staging area
444 bool MemSnapshot::merge(MemRecorder* rec) {
445 assert(rec != NULL && !rec->out_of_memory(), "Just check");
446
447 SequencedRecordIterator itr(rec->pointer_itr());
448
449 MutexLockerEx lock(_lock, true);
450 MemPointerIterator malloc_staging_itr(_staging_area.malloc_data());
451 MemPointerRecord* incoming_rec = (MemPointerRecord*) itr.current();
452 MemPointerRecord* matched_rec;
453
454 while (incoming_rec != NULL) {
455 if (incoming_rec->is_vm_pointer()) {
456 // we don't do anything with virtual memory records during merge
457 if (!_staging_area.vm_data()->append(incoming_rec)) {
458 return false;
459 }
460 } else {
461 // locate matched record and/or also position the iterator to proper
462 // location for this incoming record.
463 matched_rec = (MemPointerRecord*)malloc_staging_itr.locate(incoming_rec->addr());
464 // we have not seen this memory block in this generation,
465 // so just add to staging area
466 if (matched_rec == NULL) {
467 if (!malloc_staging_itr.insert(incoming_rec)) {
468 return false;
469 }
470 } else if (incoming_rec->addr() == matched_rec->addr()) {
471 // whoever has higher sequence number wins
472 if (incoming_rec->seq() > matched_rec->seq()) {
473 copy_seq_pointer(matched_rec, incoming_rec);
474 }
475 } else if (incoming_rec->addr() < matched_rec->addr()) {
476 if (!malloc_staging_itr.insert(incoming_rec)) {
477 return false;
478 }
479 } else {
480 ShouldNotReachHere();
481 }
482 }
483 incoming_rec = (MemPointerRecord*)itr.next();
484 }
485 NOT_PRODUCT(void check_staging_data();)
486 return true;
487 }
488
489
490 // promote data to next generation
491 bool MemSnapshot::promote(int number_of_classes) {
492 assert(_alloc_ptrs != NULL && _vm_ptrs != NULL, "Just check");
493 assert(_staging_area.malloc_data() != NULL && _staging_area.vm_data() != NULL,
494 "Just check");
495 MutexLockerEx lock(_lock, true);
496
497 MallocRecordIterator malloc_itr = _staging_area.malloc_record_walker();
498 bool promoted = false;
499 if (promote_malloc_records(&malloc_itr)) {
500 VMRecordIterator vm_itr = _staging_area.virtual_memory_record_walker();
501 if (promote_virtual_memory_records(&vm_itr)) {
502 promoted = true;
503 }
504 }
505
506 NOT_PRODUCT(check_malloc_pointers();)
507 _staging_area.clear();
508 _number_of_classes = number_of_classes;
509 return promoted;
510 }
511
512 bool MemSnapshot::promote_malloc_records(MemPointerArrayIterator* itr) {
513 MemPointerIterator malloc_snapshot_itr(_alloc_ptrs);
514 MemPointerRecord* new_rec = (MemPointerRecord*)itr->current();
515 MemPointerRecord* matched_rec;
516 while (new_rec != NULL) {
517 matched_rec = (MemPointerRecord*)malloc_snapshot_itr.locate(new_rec->addr());
518 // found matched memory block
519 if (matched_rec != NULL && new_rec->addr() == matched_rec->addr()) {
520 // snapshot already contains 'live' records
521 assert(matched_rec->is_allocation_record() || matched_rec->is_arena_memory_record(),
522 "Sanity check");
523 // update block states
524 if (new_rec->is_allocation_record()) {
525 assign_pointer(matched_rec, new_rec);
526 } else if (new_rec->is_arena_memory_record()) {
527 if (new_rec->size() == 0) {
528 // remove size record once size drops to 0
529 malloc_snapshot_itr.remove();
530 } else {
531 assign_pointer(matched_rec, new_rec);
532 }
533 } else {
534 // a deallocation record
535 assert(new_rec->is_deallocation_record(), "Sanity check");
536 // an arena record can be followed by a size record, we need to remove both
537 if (matched_rec->is_arena_record()) {
538 MemPointerRecord* next = (MemPointerRecord*)malloc_snapshot_itr.peek_next();
539 if (next != NULL && next->is_arena_memory_record() &&
540 next->is_memory_record_of_arena(matched_rec)) {
541 malloc_snapshot_itr.remove();
542 }
543 }
544 // the memory is deallocated, remove related record(s)
545 malloc_snapshot_itr.remove();
546 }
547 } else {
548 // don't insert size 0 record
549 if (new_rec->is_arena_memory_record() && new_rec->size() == 0) {
550 new_rec = NULL;
551 }
552
553 if (new_rec != NULL) {
554 if (new_rec->is_allocation_record() || new_rec->is_arena_memory_record()) {
555 if (matched_rec != NULL && new_rec->addr() > matched_rec->addr()) {
556 if (!malloc_snapshot_itr.insert_after(new_rec)) {
557 return false;
558 }
559 } else {
560 if (!malloc_snapshot_itr.insert(new_rec)) {
561 return false;
562 }
563 }
564 }
565 #ifndef PRODUCT
566 else if (!has_allocation_record(new_rec->addr())) {
567 // NMT can not track some startup memory, which is allocated before NMT is on
568 _untracked_count ++;
569 }
570 #endif
571 }
572 }
573 new_rec = (MemPointerRecord*)itr->next();
574 }
575 return true;
576 }
577
578 bool MemSnapshot::promote_virtual_memory_records(MemPointerArrayIterator* itr) {
579 VMMemPointerIterator vm_snapshot_itr(_vm_ptrs);
580 MemPointerRecord* new_rec = (MemPointerRecord*)itr->current();
581 VMMemRegion* reserved_rec;
582 while (new_rec != NULL) {
583 assert(new_rec->is_vm_pointer(), "Sanity check");
584
585 // locate a reserved region that contains the specified address, or
586 // the nearest reserved region has base address just above the specified
587 // address
588 reserved_rec = (VMMemRegion*)vm_snapshot_itr.locate(new_rec->addr());
589 if (reserved_rec != NULL && reserved_rec->contains_region(new_rec)) {
590 // snapshot can only have 'live' records
591 assert(reserved_rec->is_reserved_region(), "Sanity check");
592 if (new_rec->is_allocation_record()) {
593 if (!reserved_rec->is_same_region(new_rec)) {
594 // only deal with split a bigger reserved region into smaller regions.
595 // So far, CDS is the only use case.
596 if (!vm_snapshot_itr.split_reserved_region(reserved_rec, new_rec->addr(), new_rec->size())) {
597 return false;
598 }
599 }
600 } else if (new_rec->is_uncommit_record()) {
601 if (!vm_snapshot_itr.remove_uncommitted_region(new_rec)) {
602 return false;
603 }
604 } else if (new_rec->is_commit_record()) {
605 // insert or expand existing committed region to cover this
606 // newly committed region
607 if (!vm_snapshot_itr.add_committed_region(new_rec)) {
608 return false;
609 }
610 } else if (new_rec->is_deallocation_record()) {
611 // release part or all memory region
612 if (!vm_snapshot_itr.remove_released_region(new_rec)) {
613 return false;
614 }
615 } else if (new_rec->is_type_tagging_record()) {
616 // tag this reserved virtual memory range to a memory type. Can not re-tag a memory range
617 // to different type.
618 assert(FLAGS_TO_MEMORY_TYPE(reserved_rec->flags()) == mtNone ||
619 FLAGS_TO_MEMORY_TYPE(reserved_rec->flags()) == FLAGS_TO_MEMORY_TYPE(new_rec->flags()),
620 "Sanity check");
621 reserved_rec->tag(new_rec->flags());
622 } else {
623 ShouldNotReachHere();
624 }
625 } else {
626 /*
627 * The assertion failure indicates mis-matched virtual memory records. The likely
628 * scenario is, that some virtual memory operations are not going through os::xxxx_memory()
629 * api, which have to be tracked manually. (perfMemory is an example).
630 */
631 assert(new_rec->is_allocation_record(), "Sanity check");
632 if (!vm_snapshot_itr.add_reserved_region(new_rec)) {
633 return false;
634 }
635 }
636 new_rec = (MemPointerRecord*)itr->next();
637 }
638 return true;
639 }
640
641 #ifndef PRODUCT
642 void MemSnapshot::print_snapshot_stats(outputStream* st) {
643 st->print_cr("Snapshot:");
644 st->print_cr("\tMalloced: %d/%d [%5.2f%%] %dKB", _alloc_ptrs->length(), _alloc_ptrs->capacity(),
645 (100.0 * (float)_alloc_ptrs->length()) / (float)_alloc_ptrs->capacity(), _alloc_ptrs->instance_size()/K);
646
647 st->print_cr("\tVM: %d/%d [%5.2f%%] %dKB", _vm_ptrs->length(), _vm_ptrs->capacity(),
648 (100.0 * (float)_vm_ptrs->length()) / (float)_vm_ptrs->capacity(), _vm_ptrs->instance_size()/K);
649
650 st->print_cr("\tMalloc staging Area: %d/%d [%5.2f%%] %dKB", _staging_area.malloc_data()->length(),
651 _staging_area.malloc_data()->capacity(),
652 (100.0 * (float)_staging_area.malloc_data()->length()) / (float)_staging_area.malloc_data()->capacity(),
653 _staging_area.malloc_data()->instance_size()/K);
654
655 st->print_cr("\tVirtual memory staging Area: %d/%d [%5.2f%%] %dKB", _staging_area.vm_data()->length(),
656 _staging_area.vm_data()->capacity(),
657 (100.0 * (float)_staging_area.vm_data()->length()) / (float)_staging_area.vm_data()->capacity(),
658 _staging_area.vm_data()->instance_size()/K);
659
660 st->print_cr("\tUntracked allocation: %d", _untracked_count);
661 }
662
663 void MemSnapshot::check_malloc_pointers() {
664 MemPointerArrayIteratorImpl mItr(_alloc_ptrs);
665 MemPointerRecord* p = (MemPointerRecord*)mItr.current();
666 MemPointerRecord* prev = NULL;
667 while (p != NULL) {
668 if (prev != NULL) {
669 assert(p->addr() >= prev->addr(), "sorting order");
670 }
671 prev = p;
672 p = (MemPointerRecord*)mItr.next();
673 }
674 }
675
676 bool MemSnapshot::has_allocation_record(address addr) {
677 MemPointerArrayIteratorImpl itr(_staging_area.malloc_data());
678 MemPointerRecord* cur = (MemPointerRecord*)itr.current();
679 while (cur != NULL) {
680 if (cur->addr() == addr && cur->is_allocation_record()) {
681 return true;
682 }
683 cur = (MemPointerRecord*)itr.next();
684 }
685 return false;
686 }
687 #endif // PRODUCT
688
689 #ifdef ASSERT
690 void MemSnapshot::check_staging_data() {
691 MemPointerArrayIteratorImpl itr(_staging_area.malloc_data());
692 MemPointerRecord* cur = (MemPointerRecord*)itr.current();
693 MemPointerRecord* next = (MemPointerRecord*)itr.next();
694 while (next != NULL) {
695 assert((next->addr() > cur->addr()) ||
696 ((next->flags() & MemPointerRecord::tag_masks) >
697 (cur->flags() & MemPointerRecord::tag_masks)),
698 "sorting order");
699 cur = next;
700 next = (MemPointerRecord*)itr.next();
701 }
702
703 MemPointerArrayIteratorImpl vm_itr(_staging_area.vm_data());
704 cur = (MemPointerRecord*)vm_itr.current();
705 while (cur != NULL) {
706 assert(cur->is_vm_pointer(), "virtual memory pointer only");
707 cur = (MemPointerRecord*)vm_itr.next();
708 }
709 }
710
711 void MemSnapshot::dump_all_vm_pointers() {
712 MemPointerArrayIteratorImpl itr(_vm_ptrs);
713 VMMemRegion* ptr = (VMMemRegion*)itr.current();
714 tty->print_cr("dump virtual memory pointers:");
715 while (ptr != NULL) {
716 if (ptr->is_committed_region()) {
717 tty->print("\t");
718 }
719 tty->print("[" PTR_FORMAT " - " PTR_FORMAT "] [%x]", ptr->addr(),
720 (ptr->addr() + ptr->size()), ptr->flags());
721
722 if (MemTracker::track_callsite()) {
723 VMMemRegionEx* ex = (VMMemRegionEx*)ptr;
724 if (ex->pc() != NULL) {
725 char buf[1024];
726 if (os::dll_address_to_function_name(ex->pc(), buf, sizeof(buf), NULL)) {
727 tty->print_cr("\t%s", buf);
728 } else {
729 tty->print_cr("");
730 }
731 }
732 }
733
734 ptr = (VMMemRegion*)itr.next();
735 }
736 tty->flush();
737 }
738 #endif // ASSERT
739