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* reserved_rgn = (VMMemRegion*)current();
127
128 // we don't have anything yet
129 if (reserved_rgn == NULL) {
130 return insert_record(rec);
131 }
132
133 assert(reserved_rgn->is_reserved_region(), "Sanity check");
134 // duplicated records
135 if (reserved_rgn->is_same_region(rec)) {
136 return true;
137 }
138 // an attached JNI thread can exit without detaching the thread, that results
139 // JVM to leak JavaThread object (JDK-8001743)
140 if (CheckJNICalls) {
141 guarantee(FLAGS_TO_MEMORY_TYPE(reserved_rgn->flags()) != mtThreadStack ||
142 !reserved_rgn->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_rgn->flags()) == mtThreadStack ||
147 reserved_rgn->base() > rec->addr(), "Just check: locate()");
148 assert(FLAGS_TO_MEMORY_TYPE(reserved_rgn->flags()) == mtThreadStack ||
149 !reserved_rgn->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 #ifdef ASSERT
265 VMMemRegion* next_reg = (VMMemRegion*)peek_next();
266 // should not have any committed memory in this reserved region
267 assert(next_reg == NULL || !next_reg->is_committed_region(), "Sanity check");
268 #endif
269 if (rec->is_same_region(cur)) {
270 remove();
271 } else if (rec->addr() == cur->addr() ||
272 rec->addr() + rec->size() == cur->addr() + cur->size()) {
273 // released region is at either end of this region
274 cur->exclude_region(rec->addr(), rec->size());
275 } else { // split the reserved region and release the middle
276 address high_addr = cur->addr() + cur->size();
277 size_t sz = high_addr - rec->addr();
278 cur->exclude_region(rec->addr(), sz);
279 sz = high_addr - rec->addr() - rec->size();
280 if (MemTracker::track_callsite()) {
281 MemPointerRecordEx tmp(rec->addr() + rec->size(), cur->flags(), sz,
282 ((VMMemRegionEx*)cur)->pc());
283 return insert_reserved_region(&tmp);
284 } else {
285 MemPointerRecord tmp(rec->addr() + rec->size(), cur->flags(), sz);
286 return insert_reserved_region(&tmp);
287 }
288 }
289 return true;
290 }
291
292 bool VMMemPointerIterator::insert_reserved_region(MemPointerRecord* rec) {
293 // skip all 'commit' records associated with previous reserved region
294 VMMemRegion* p = (VMMemRegion*)next();
295 while (p != NULL && p->is_committed_region() &&
296 p->base() + p->size() < rec->addr()) {
297 p = (VMMemRegion*)next();
298 }
299 return insert_record(rec);
300 }
301
302 bool VMMemPointerIterator::split_reserved_region(VMMemRegion* rgn, address new_rgn_addr, size_t new_rgn_size) {
303 assert(rgn->contains_region(new_rgn_addr, new_rgn_size), "Not fully contained");
304 address pc = (MemTracker::track_callsite() ? ((VMMemRegionEx*)rgn)->pc() : NULL);
305 if (rgn->base() == new_rgn_addr) { // new region is at the beginning of the region
306 size_t sz = rgn->size() - new_rgn_size;
307 // the original region becomes 'new' region
308 rgn->exclude_region(new_rgn_addr + new_rgn_size, sz);
309 // remaining becomes next region
310 MemPointerRecordEx next_rgn(new_rgn_addr + new_rgn_size, rgn->flags(), sz, pc);
311 return insert_reserved_region(&next_rgn);
312 } else if (rgn->base() + rgn->size() == new_rgn_addr + new_rgn_size) {
313 rgn->exclude_region(new_rgn_addr, new_rgn_size);
314 MemPointerRecordEx next_rgn(new_rgn_addr, rgn->flags(), new_rgn_size, pc);
315 return insert_reserved_region(&next_rgn);
316 } else {
317 // the orginal region will be split into three
318 address rgn_high_addr = rgn->base() + rgn->size();
319 // first region
320 rgn->exclude_region(new_rgn_addr, (rgn_high_addr - new_rgn_addr));
321 // the second region is the new region
322 MemPointerRecordEx new_rgn(new_rgn_addr, rgn->flags(), new_rgn_size, pc);
323 if (!insert_reserved_region(&new_rgn)) return false;
324 // the remaining region
325 MemPointerRecordEx rem_rgn(new_rgn_addr + new_rgn_size, rgn->flags(),
326 rgn_high_addr - (new_rgn_addr + new_rgn_size), pc);
327 return insert_reserved_region(&rem_rgn);
328 }
329 }
330
331 static int sort_in_seq_order(const void* p1, const void* p2) {
332 assert(p1 != NULL && p2 != NULL, "Sanity check");
333 const MemPointerRecord* mp1 = (MemPointerRecord*)p1;
334 const MemPointerRecord* mp2 = (MemPointerRecord*)p2;
335 return (mp1->seq() - mp2->seq());
336 }
337
338 bool StagingArea::init() {
339 if (MemTracker::track_callsite()) {
340 _malloc_data = new (std::nothrow)MemPointerArrayImpl<SeqMemPointerRecordEx>();
341 _vm_data = new (std::nothrow)MemPointerArrayImpl<SeqMemPointerRecordEx>();
342 } else {
343 _malloc_data = new (std::nothrow)MemPointerArrayImpl<SeqMemPointerRecord>();
344 _vm_data = new (std::nothrow)MemPointerArrayImpl<SeqMemPointerRecord>();
345 }
346
347 if (_malloc_data != NULL && _vm_data != NULL &&
348 !_malloc_data->out_of_memory() &&
349 !_vm_data->out_of_memory()) {
350 return true;
351 } else {
352 if (_malloc_data != NULL) delete _malloc_data;
353 if (_vm_data != NULL) delete _vm_data;
354 _malloc_data = NULL;
355 _vm_data = NULL;
356 return false;
357 }
358 }
359
360
361 VMRecordIterator StagingArea::virtual_memory_record_walker() {
362 MemPointerArray* arr = vm_data();
363 // sort into seq number order
364 arr->sort((FN_SORT)sort_in_seq_order);
365 return VMRecordIterator(arr);
366 }
367
368
369 MemSnapshot::MemSnapshot() {
370 if (MemTracker::track_callsite()) {
371 _alloc_ptrs = new (std::nothrow) MemPointerArrayImpl<MemPointerRecordEx>();
372 _vm_ptrs = new (std::nothrow)MemPointerArrayImpl<VMMemRegionEx>(64, true);
373 } else {
374 _alloc_ptrs = new (std::nothrow) MemPointerArrayImpl<MemPointerRecord>();
375 _vm_ptrs = new (std::nothrow)MemPointerArrayImpl<VMMemRegion>(64, true);
376 }
377
378 _staging_area.init();
379 _lock = new (std::nothrow) Mutex(Monitor::max_nonleaf - 1, "memSnapshotLock");
380 NOT_PRODUCT(_untracked_count = 0;)
381 }
382
383 MemSnapshot::~MemSnapshot() {
384 assert(MemTracker::shutdown_in_progress(), "native memory tracking still on");
385 {
386 MutexLockerEx locker(_lock);
387 if (_alloc_ptrs != NULL) {
388 delete _alloc_ptrs;
389 _alloc_ptrs = NULL;
390 }
391
392 if (_vm_ptrs != NULL) {
393 delete _vm_ptrs;
394 _vm_ptrs = NULL;
395 }
396 }
397
398 if (_lock != NULL) {
399 delete _lock;
400 _lock = NULL;
401 }
402 }
403
404 void MemSnapshot::copy_pointer(MemPointerRecord* dest, const MemPointerRecord* src) {
405 assert(dest != NULL && src != NULL, "Just check");
406 assert(dest->addr() == src->addr(), "Just check");
407
408 MEMFLAGS flags = dest->flags();
409
410 if (MemTracker::track_callsite()) {
411 *(MemPointerRecordEx*)dest = *(MemPointerRecordEx*)src;
412 } else {
413 *dest = *src;
414 }
415 }
416
417
418 // merge a per-thread memory recorder to the staging area
419 bool MemSnapshot::merge(MemRecorder* rec) {
420 assert(rec != NULL && !rec->out_of_memory(), "Just check");
421
422 SequencedRecordIterator itr(rec->pointer_itr());
423
424 MutexLockerEx lock(_lock, true);
425 MemPointerIterator malloc_staging_itr(_staging_area.malloc_data());
426 MemPointerRecord *p1, *p2;
427 p1 = (MemPointerRecord*) itr.current();
428 while (p1 != NULL) {
429 if (p1->is_vm_pointer()) {
430 // we don't do anything with virtual memory records during merge
431 if (!_staging_area.vm_data()->append(p1)) {
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 p2 = (MemPointerRecord*)malloc_staging_itr.locate(p1->addr());
438 // we have not seen this memory block, so just add to staging area
439 if (p2 == NULL) {
440 if (!malloc_staging_itr.insert(p1)) {
441 return false;
442 }
443 } else if (p1->addr() == p2->addr()) {
444 MemPointerRecord* staging_next = (MemPointerRecord*)malloc_staging_itr.peek_next();
445 // a memory block can have many tagging records, find right one to replace or
446 // right position to insert
447 while (staging_next != NULL && staging_next->addr() == p1->addr()) {
448 if ((staging_next->flags() & MemPointerRecord::tag_masks) <=
449 (p1->flags() & MemPointerRecord::tag_masks)) {
450 p2 = (MemPointerRecord*)malloc_staging_itr.next();
451 staging_next = (MemPointerRecord*)malloc_staging_itr.peek_next();
452 } else {
453 break;
454 }
455 }
456 int df = (p1->flags() & MemPointerRecord::tag_masks) -
457 (p2->flags() & MemPointerRecord::tag_masks);
458 if (df == 0) {
459 assert(p1->seq() > 0, "not sequenced");
460 assert(p2->seq() > 0, "not sequenced");
461 if (p1->seq() > p2->seq()) {
462 copy_pointer(p2, p1);
463 }
464 } else if (df < 0) {
465 if (!malloc_staging_itr.insert(p1)) {
466 return false;
467 }
468 } else {
469 if (!malloc_staging_itr.insert_after(p1)) {
470 return false;
471 }
472 }
473 } else if (p1->addr() < p2->addr()) {
474 if (!malloc_staging_itr.insert(p1)) {
475 return false;
476 }
477 } else {
478 if (!malloc_staging_itr.insert_after(p1)) {
479 return false;
480 }
481 }
482 }
483 p1 = (MemPointerRecord*)itr.next();
484 }
485 NOT_PRODUCT(void check_staging_data();)
486 return true;
487 }
488
489
490
491 // promote data to next generation
492 bool MemSnapshot::promote() {
493 assert(_alloc_ptrs != NULL && _vm_ptrs != NULL, "Just check");
494 assert(_staging_area.malloc_data() != NULL && _staging_area.vm_data() != NULL,
495 "Just check");
496 MutexLockerEx lock(_lock, true);
497
498 MallocRecordIterator malloc_itr = _staging_area.malloc_record_walker();
499 bool promoted = false;
500 if (promote_malloc_records(&malloc_itr)) {
501 VMRecordIterator vm_itr = _staging_area.virtual_memory_record_walker();
502 if (promote_virtual_memory_records(&vm_itr)) {
503 promoted = true;
504 }
505 }
506
507 NOT_PRODUCT(check_malloc_pointers();)
508 _staging_area.clear();
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_size_record(),
522 "Sanity check");
523 // update block states
524 if (new_rec->is_allocation_record() || new_rec->is_arena_size_record()) {
525 copy_pointer(matched_rec, new_rec);
526 } else {
527 // a deallocation record
528 assert(new_rec->is_deallocation_record(), "Sanity check");
529 // an arena record can be followed by a size record, we need to remove both
530 if (matched_rec->is_arena_record()) {
531 MemPointerRecord* next = (MemPointerRecord*)malloc_snapshot_itr.peek_next();
532 if (next->is_arena_size_record()) {
533 // it has to match the arena record
534 assert(next->is_size_record_of_arena(matched_rec), "Sanity check");
535 malloc_snapshot_itr.remove();
536 }
537 }
538 // the memory is deallocated, remove related record(s)
539 malloc_snapshot_itr.remove();
540 }
541 } else {
542 // it is a new record, insert into snapshot
543 if (new_rec->is_arena_size_record()) {
544 MemPointerRecord* prev = (MemPointerRecord*)malloc_snapshot_itr.peek_prev();
545 if (prev == NULL || !prev->is_arena_record() || !new_rec->is_size_record_of_arena(prev)) {
546 // no matched arena record, ignore the size record
547 new_rec = NULL;
548 }
549 }
550 // only 'live' record can go into snapshot
551 if (new_rec != NULL) {
552 if (new_rec->is_allocation_record() || new_rec->is_arena_size_record()) {
553 if (matched_rec != NULL && new_rec->addr() > matched_rec->addr()) {
554 if (!malloc_snapshot_itr.insert_after(new_rec)) {
555 return false;
556 }
557 } else {
558 if (!malloc_snapshot_itr.insert(new_rec)) {
559 return false;
560 }
561 }
562 }
563 #ifndef PRODUCT
564 else if (!has_allocation_record(new_rec->addr())) {
565 // NMT can not track some startup memory, which is allocated before NMT is on
566 _untracked_count ++;
567 }
568 #endif
569 }
570 }
571 new_rec = (MemPointerRecord*)itr->next();
572 }
573 return true;
574 }
575
576 bool MemSnapshot::promote_virtual_memory_records(MemPointerArrayIterator* itr) {
577 VMMemPointerIterator vm_snapshot_itr(_vm_ptrs);
578 MemPointerRecord* new_rec = (MemPointerRecord*)itr->current();
579 VMMemRegion* reserved_rec;
580 while (new_rec != NULL) {
581 assert(new_rec->is_vm_pointer(), "Sanity check");
582
583 // locate a reserved region that contains the specified address, or
584 // the nearest reserved region has base address just above the specified
585 // address
586 reserved_rec = (VMMemRegion*)vm_snapshot_itr.locate(new_rec->addr());
587 if (reserved_rec != NULL && reserved_rec->contains_region(new_rec)) {
588 // snapshot can only have 'live' records
589 assert(reserved_rec->is_reserved_region(), "Sanity check");
590 if (new_rec->is_allocation_record()) {
591 if (!reserved_rec->is_same_region(new_rec)) {
592 // only deal with split a bigger reserved region into smaller regions.
593 // So far, CDS is the only use case.
594 if (!vm_snapshot_itr.split_reserved_region(reserved_rec, new_rec->addr(), new_rec->size())) {
595 return false;
596 }
597 }
598 } else if (new_rec->is_uncommit_record()) {
599 if (!vm_snapshot_itr.remove_uncommitted_region(new_rec)) {
600 return false;
601 }
602 } else if (new_rec->is_commit_record()) {
603 // insert or expand existing committed region to cover this
604 // newly committed region
605 if (!vm_snapshot_itr.add_committed_region(new_rec)) {
606 return false;
607 }
608 } else if (new_rec->is_deallocation_record()) {
609 // release part or all memory region
610 if (!vm_snapshot_itr.remove_released_region(new_rec)) {
611 return false;
612 }
613 } else if (new_rec->is_type_tagging_record()) {
614 // tag this reserved virtual memory range to a memory type. Can not re-tag a memory range
615 // to different type.
616 assert(FLAGS_TO_MEMORY_TYPE(reserved_rec->flags()) == mtNone ||
617 FLAGS_TO_MEMORY_TYPE(reserved_rec->flags()) == FLAGS_TO_MEMORY_TYPE(new_rec->flags()),
618 "Sanity check");
619 reserved_rec->tag(new_rec->flags());
620 } else {
621 ShouldNotReachHere();
622 }
623 } else {
624 /*
625 * The assertion failure indicates mis-matched virtual memory records. The likely
626 * scenario is, that some virtual memory operations are not going through os::xxxx_memory()
627 * api, which have to be tracked manually. (perfMemory is an example).
628 */
629 assert(new_rec->is_allocation_record(), "Sanity check");
630 if (!vm_snapshot_itr.add_reserved_region(new_rec)) {
631 return false;
632 }
633 }
634 new_rec = (MemPointerRecord*)itr->next();
635 }
636 return true;
637 }
638
639 #ifndef PRODUCT
640 void MemSnapshot::print_snapshot_stats(outputStream* st) {
641 st->print_cr("Snapshot:");
642 st->print_cr("\tMalloced: %d/%d [%5.2f%%] %dKB", _alloc_ptrs->length(), _alloc_ptrs->capacity(),
643 (100.0 * (float)_alloc_ptrs->length()) / (float)_alloc_ptrs->capacity(), _alloc_ptrs->instance_size()/K);
644
645 st->print_cr("\tVM: %d/%d [%5.2f%%] %dKB", _vm_ptrs->length(), _vm_ptrs->capacity(),
646 (100.0 * (float)_vm_ptrs->length()) / (float)_vm_ptrs->capacity(), _vm_ptrs->instance_size()/K);
647
648 st->print_cr("\tMalloc staging Area: %d/%d [%5.2f%%] %dKB", _staging_area.malloc_data()->length(),
649 _staging_area.malloc_data()->capacity(),
650 (100.0 * (float)_staging_area.malloc_data()->length()) / (float)_staging_area.malloc_data()->capacity(),
651 _staging_area.malloc_data()->instance_size()/K);
652
653 st->print_cr("\tVirtual memory staging Area: %d/%d [%5.2f%%] %dKB", _staging_area.vm_data()->length(),
654 _staging_area.vm_data()->capacity(),
655 (100.0 * (float)_staging_area.vm_data()->length()) / (float)_staging_area.vm_data()->capacity(),
656 _staging_area.vm_data()->instance_size()/K);
657
658 st->print_cr("\tUntracked allocation: %d", _untracked_count);
659 }
660
661 void MemSnapshot::check_malloc_pointers() {
662 MemPointerArrayIteratorImpl mItr(_alloc_ptrs);
663 MemPointerRecord* p = (MemPointerRecord*)mItr.current();
664 MemPointerRecord* prev = NULL;
665 while (p != NULL) {
666 if (prev != NULL) {
667 assert(p->addr() >= prev->addr(), "sorting order");
668 }
669 prev = p;
670 p = (MemPointerRecord*)mItr.next();
671 }
672 }
673
674 bool MemSnapshot::has_allocation_record(address addr) {
675 MemPointerArrayIteratorImpl itr(_staging_area.malloc_data());
676 MemPointerRecord* cur = (MemPointerRecord*)itr.current();
677 while (cur != NULL) {
678 if (cur->addr() == addr && cur->is_allocation_record()) {
679 return true;
680 }
681 cur = (MemPointerRecord*)itr.next();
682 }
683 return false;
684 }
685 #endif // PRODUCT
686
687 #ifdef ASSERT
688 void MemSnapshot::check_staging_data() {
689 MemPointerArrayIteratorImpl itr(_staging_area.malloc_data());
690 MemPointerRecord* cur = (MemPointerRecord*)itr.current();
691 MemPointerRecord* next = (MemPointerRecord*)itr.next();
692 while (next != NULL) {
693 assert((next->addr() > cur->addr()) ||
694 ((next->flags() & MemPointerRecord::tag_masks) >
695 (cur->flags() & MemPointerRecord::tag_masks)),
696 "sorting order");
697 cur = next;
698 next = (MemPointerRecord*)itr.next();
699 }
700
701 MemPointerArrayIteratorImpl vm_itr(_staging_area.vm_data());
702 cur = (MemPointerRecord*)vm_itr.current();
703 while (cur != NULL) {
704 assert(cur->is_vm_pointer(), "virtual memory pointer only");
705 cur = (MemPointerRecord*)vm_itr.next();
706 }
707 }
708
709 void MemSnapshot::dump_all_vm_pointers() {
710 MemPointerArrayIteratorImpl itr(_vm_ptrs);
711 VMMemRegion* ptr = (VMMemRegion*)itr.current();
712 tty->print_cr("dump virtual memory pointers:");
713 while (ptr != NULL) {
714 if (ptr->is_committed_region()) {
715 tty->print("\t");
716 }
717 tty->print("[" PTR_FORMAT " - " PTR_FORMAT "] [%x]", ptr->addr(),
718 (ptr->addr() + ptr->size()), ptr->flags());
719
720 if (MemTracker::track_callsite()) {
721 VMMemRegionEx* ex = (VMMemRegionEx*)ptr;
722 if (ex->pc() != NULL) {
723 char buf[1024];
724 if (os::dll_address_to_function_name(ex->pc(), buf, sizeof(buf), NULL)) {
725 tty->print_cr("\t%s", buf);
726 } else {
727 tty->print_cr("");
728 }
729 }
730 }
731
732 ptr = (VMMemRegion*)itr.next();
733 }
734 tty->flush();
735 }
736 #endif // ASSERT
737