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