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 266 #ifdef ASSERT 267 VMMemRegion* next_region = (VMMemRegion*)peek_next(); 268 // should not have any committed memory in this reserved region 269 assert(next_region == NULL || !next_region->is_committed_region(), "Sanity check"); 270 #endif 271 remove(); 272 } else if (rec->addr() == cur->addr() || 273 rec->addr() + rec->size() == cur->addr() + cur->size()) { 274 // released region is at either end of this region 275 cur->exclude_region(rec->addr(), rec->size()); 276 assert(check_reserved_region(), "Integrity check"); 277 } else { // split the reserved region and release the middle 278 address high_addr = cur->addr() + cur->size(); 279 size_t sz = high_addr - rec->addr(); 280 cur->exclude_region(rec->addr(), sz); 281 sz = high_addr - rec->addr() - rec->size(); 282 if (MemTracker::track_callsite()) { 283 MemPointerRecordEx tmp(rec->addr() + rec->size(), cur->flags(), sz, 284 ((VMMemRegionEx*)cur)->pc()); 285 bool ret = insert_reserved_region(&tmp); 286 assert(!ret || check_reserved_region(), "Integrity check"); 287 return ret; 288 } else { 289 MemPointerRecord tmp(rec->addr() + rec->size(), cur->flags(), sz); 290 bool ret = insert_reserved_region(&tmp); 291 assert(!ret || check_reserved_region(), "Integrity check"); 292 return ret; 293 } 294 } 295 return true; 296 } 297 298 bool VMMemPointerIterator::insert_reserved_region(MemPointerRecord* rec) { 299 // skip all 'commit' records associated with previous reserved region 300 VMMemRegion* p = (VMMemRegion*)next(); 301 while (p != NULL && p->is_committed_region() && 302 p->base() + p->size() < rec->addr()) { 303 p = (VMMemRegion*)next(); 304 } 305 return insert_record(rec); 306 } 307 308 bool VMMemPointerIterator::split_reserved_region(VMMemRegion* rgn, address new_rgn_addr, size_t new_rgn_size) { 309 assert(rgn->contains_region(new_rgn_addr, new_rgn_size), "Not fully contained"); 310 address pc = (MemTracker::track_callsite() ? ((VMMemRegionEx*)rgn)->pc() : NULL); 311 if (rgn->base() == new_rgn_addr) { // new region is at the beginning of the region 312 size_t sz = rgn->size() - new_rgn_size; 313 // the original region becomes 'new' region 314 rgn->exclude_region(new_rgn_addr + new_rgn_size, sz); 315 // remaining becomes next region 316 MemPointerRecordEx next_rgn(new_rgn_addr + new_rgn_size, rgn->flags(), sz, pc); 317 return insert_reserved_region(&next_rgn); 318 } else if (rgn->base() + rgn->size() == new_rgn_addr + new_rgn_size) { 319 rgn->exclude_region(new_rgn_addr, new_rgn_size); 320 MemPointerRecordEx next_rgn(new_rgn_addr, rgn->flags(), new_rgn_size, pc); 321 return insert_reserved_region(&next_rgn); 322 } else { 323 // the orginal region will be split into three 324 address rgn_high_addr = rgn->base() + rgn->size(); 325 // first region 326 rgn->exclude_region(new_rgn_addr, (rgn_high_addr - new_rgn_addr)); 327 // the second region is the new region 328 MemPointerRecordEx new_rgn(new_rgn_addr, rgn->flags(), new_rgn_size, pc); 329 if (!insert_reserved_region(&new_rgn)) return false; 330 // the remaining region 331 MemPointerRecordEx rem_rgn(new_rgn_addr + new_rgn_size, rgn->flags(), 332 rgn_high_addr - (new_rgn_addr + new_rgn_size), pc); 333 return insert_reserved_region(&rem_rgn); 334 } 335 } 336 337 static int sort_in_seq_order(const void* p1, const void* p2) { 338 assert(p1 != NULL && p2 != NULL, "Sanity check"); 339 const MemPointerRecord* mp1 = (MemPointerRecord*)p1; 340 const MemPointerRecord* mp2 = (MemPointerRecord*)p2; 341 return (mp1->seq() - mp2->seq()); 342 } 343 344 bool StagingArea::init() { 345 if (MemTracker::track_callsite()) { 346 _malloc_data = new (std::nothrow)MemPointerArrayImpl<SeqMemPointerRecordEx>(); 347 _vm_data = new (std::nothrow)MemPointerArrayImpl<SeqMemPointerRecordEx>(); 348 } else { 349 _malloc_data = new (std::nothrow)MemPointerArrayImpl<SeqMemPointerRecord>(); 350 _vm_data = new (std::nothrow)MemPointerArrayImpl<SeqMemPointerRecord>(); 351 } 352 353 if (_malloc_data != NULL && _vm_data != NULL && 354 !_malloc_data->out_of_memory() && 355 !_vm_data->out_of_memory()) { 356 return true; 357 } else { 358 if (_malloc_data != NULL) delete _malloc_data; 359 if (_vm_data != NULL) delete _vm_data; 360 _malloc_data = NULL; 361 _vm_data = NULL; 362 return false; 363 } 364 } 365 366 367 VMRecordIterator StagingArea::virtual_memory_record_walker() { 368 MemPointerArray* arr = vm_data(); 369 // sort into seq number order 370 arr->sort((FN_SORT)sort_in_seq_order); 371 return VMRecordIterator(arr); 372 } 373 374 375 MemSnapshot::MemSnapshot() { 376 if (MemTracker::track_callsite()) { 377 _alloc_ptrs = new (std::nothrow) MemPointerArrayImpl<MemPointerRecordEx>(); 378 _vm_ptrs = new (std::nothrow)MemPointerArrayImpl<VMMemRegionEx>(64, true); 379 } else { 380 _alloc_ptrs = new (std::nothrow) MemPointerArrayImpl<MemPointerRecord>(); 381 _vm_ptrs = new (std::nothrow)MemPointerArrayImpl<VMMemRegion>(64, true); 382 } 383 384 _staging_area.init(); 385 _lock = new (std::nothrow) Mutex(Monitor::max_nonleaf - 1, "memSnapshotLock"); 386 NOT_PRODUCT(_untracked_count = 0;) 387 } 388 389 MemSnapshot::~MemSnapshot() { 390 assert(MemTracker::shutdown_in_progress(), "native memory tracking still on"); 391 { 392 MonitorLockerEx locker(_lock); 393 394 // wakeup all waiters 395 locker.notify_all(); 396 397 if (_alloc_ptrs != NULL) { 398 delete _alloc_ptrs; 399 _alloc_ptrs = NULL; 400 } 401 402 if (_vm_ptrs != NULL) { 403 delete _vm_ptrs; 404 _vm_ptrs = NULL; 405 } 406 } 407 408 if (_lock != NULL) { 409 delete _lock; 410 _lock = NULL; 411 } 412 } 413 414 415 void MemSnapshot::copy_seq_pointer(MemPointerRecord* dest, const MemPointerRecord* src) { 416 assert(dest != NULL && src != NULL, "Just check"); 417 assert(dest->addr() == src->addr(), "Just check"); 418 assert(dest->seq() > 0 && src->seq() > 0, "not sequenced"); 419 420 if (MemTracker::track_callsite()) { 421 *(SeqMemPointerRecordEx*)dest = *(SeqMemPointerRecordEx*)src; 422 } else { 423 *(SeqMemPointerRecord*)dest = *(SeqMemPointerRecord*)src; 424 } 425 } 426 427 void MemSnapshot::assign_pointer(MemPointerRecord*dest, const MemPointerRecord* src) { 428 assert(src != NULL && dest != NULL, "Just check"); 429 assert(dest->seq() == 0 && src->seq() >0, "cast away sequence"); 430 431 if (MemTracker::track_callsite()) { 432 *(MemPointerRecordEx*)dest = *(MemPointerRecordEx*)src; 433 } else { 434 *(MemPointerRecord*)dest = *(MemPointerRecord*)src; 435 } 436 } 437 438 // merge a recorder to the staging area 439 bool MemSnapshot::merge(MemRecorder* rec) { 440 assert(rec != NULL && !rec->out_of_memory(), "Just check"); 441 442 SequencedRecordIterator itr(rec->pointer_itr()); 443 444 MutexLockerEx lock(_lock, true); 445 MemPointerIterator malloc_staging_itr(_staging_area.malloc_data()); 446 MemPointerRecord* incoming_rec = (MemPointerRecord*) itr.current(); 447 MemPointerRecord* matched_rec; 448 449 while (incoming_rec != NULL) { 450 if (incoming_rec->is_vm_pointer()) { 451 // we don't do anything with virtual memory records during merge 452 if (!_staging_area.vm_data()->append(incoming_rec)) { 453 return false; 454 } 455 } else { 456 // locate matched record and/or also position the iterator to proper 457 // location for this incoming record. 458 matched_rec = (MemPointerRecord*)malloc_staging_itr.locate(incoming_rec->addr()); 459 // we have not seen this memory block in this generation, 460 // so just add to staging area 461 if (matched_rec == NULL) { 462 if (!malloc_staging_itr.insert(incoming_rec)) { 463 return false; 464 } 465 } else if (incoming_rec->addr() == matched_rec->addr()) { 466 // whoever has higher sequence number wins 467 if (incoming_rec->seq() > matched_rec->seq()) { 468 copy_seq_pointer(matched_rec, incoming_rec); 469 } 470 } else if (incoming_rec->addr() < matched_rec->addr()) { 471 if (!malloc_staging_itr.insert(incoming_rec)) { 472 return false; 473 } 474 } else { 475 ShouldNotReachHere(); 476 } 477 } 478 incoming_rec = (MemPointerRecord*)itr.next(); 479 } 480 NOT_PRODUCT(void check_staging_data();) 481 return true; 482 } 483 484 485 // promote data to next generation 486 bool MemSnapshot::promote() { 487 assert(_alloc_ptrs != NULL && _vm_ptrs != NULL, "Just check"); 488 assert(_staging_area.malloc_data() != NULL && _staging_area.vm_data() != NULL, 489 "Just check"); 490 MutexLockerEx lock(_lock, true); 491 492 MallocRecordIterator malloc_itr = _staging_area.malloc_record_walker(); 493 bool promoted = false; 494 if (promote_malloc_records(&malloc_itr)) { 495 VMRecordIterator vm_itr = _staging_area.virtual_memory_record_walker(); 496 if (promote_virtual_memory_records(&vm_itr)) { 497 promoted = true; 498 } 499 } 500 501 NOT_PRODUCT(check_malloc_pointers();) 502 _staging_area.clear(); 503 return promoted; 504 } 505 506 bool MemSnapshot::promote_malloc_records(MemPointerArrayIterator* itr) { 507 MemPointerIterator malloc_snapshot_itr(_alloc_ptrs); 508 MemPointerRecord* new_rec = (MemPointerRecord*)itr->current(); 509 MemPointerRecord* matched_rec; 510 while (new_rec != NULL) { 511 matched_rec = (MemPointerRecord*)malloc_snapshot_itr.locate(new_rec->addr()); 512 // found matched memory block 513 if (matched_rec != NULL && new_rec->addr() == matched_rec->addr()) { 514 // snapshot already contains 'live' records 515 assert(matched_rec->is_allocation_record() || matched_rec->is_arena_memory_record(), 516 "Sanity check"); 517 // update block states 518 if (new_rec->is_allocation_record()) { 519 assign_pointer(matched_rec, new_rec); 520 } else if (new_rec->is_arena_memory_record()) { 521 if (new_rec->size() == 0) { 522 // remove size record once size drops to 0 523 malloc_snapshot_itr.remove(); 524 } else { 525 assign_pointer(matched_rec, new_rec); 526 } 527 } else { 528 // a deallocation record 529 assert(new_rec->is_deallocation_record(), "Sanity check"); 530 // an arena record can be followed by a size record, we need to remove both 531 if (matched_rec->is_arena_record()) { 532 MemPointerRecord* next = (MemPointerRecord*)malloc_snapshot_itr.peek_next(); 533 if (next->is_arena_memory_record() && next->is_memory_record_of_arena(matched_rec)) { 534 malloc_snapshot_itr.remove(); 535 } 536 } 537 // the memory is deallocated, remove related record(s) 538 malloc_snapshot_itr.remove(); 539 } 540 } else { 541 // don't insert size 0 record 542 if (new_rec->is_arena_memory_record() && new_rec->size() == 0) { 543 new_rec = NULL; 544 } 545 546 if (new_rec != NULL) { 547 if (new_rec->is_allocation_record() || new_rec->is_arena_memory_record()) { 548 if (matched_rec != NULL && new_rec->addr() > matched_rec->addr()) { 549 if (!malloc_snapshot_itr.insert_after(new_rec)) { 550 return false; 551 } 552 } else { 553 if (!malloc_snapshot_itr.insert(new_rec)) { 554 return false; 555 } 556 } 557 } 558 #ifndef PRODUCT 559 else if (!has_allocation_record(new_rec->addr())) { 560 // NMT can not track some startup memory, which is allocated before NMT is on 561 _untracked_count ++; 562 } 563 #endif 564 } 565 } 566 new_rec = (MemPointerRecord*)itr->next(); 567 } 568 return true; 569 } 570 571 bool MemSnapshot::promote_virtual_memory_records(MemPointerArrayIterator* itr) { 572 VMMemPointerIterator vm_snapshot_itr(_vm_ptrs); 573 MemPointerRecord* new_rec = (MemPointerRecord*)itr->current(); 574 VMMemRegion* reserved_rec; 575 while (new_rec != NULL) { 576 assert(new_rec->is_vm_pointer(), "Sanity check"); 577 578 // locate a reserved region that contains the specified address, or 579 // the nearest reserved region has base address just above the specified 580 // address 581 reserved_rec = (VMMemRegion*)vm_snapshot_itr.locate(new_rec->addr()); 582 if (reserved_rec != NULL && reserved_rec->contains_region(new_rec)) { 583 // snapshot can only have 'live' records 584 assert(reserved_rec->is_reserved_region(), "Sanity check"); 585 if (new_rec->is_allocation_record()) { 586 if (!reserved_rec->is_same_region(new_rec)) { 587 // only deal with split a bigger reserved region into smaller regions. 588 // So far, CDS is the only use case. 589 if (!vm_snapshot_itr.split_reserved_region(reserved_rec, new_rec->addr(), new_rec->size())) { 590 return false; 591 } 592 } 593 } else if (new_rec->is_uncommit_record()) { 594 if (!vm_snapshot_itr.remove_uncommitted_region(new_rec)) { 595 return false; 596 } 597 } else if (new_rec->is_commit_record()) { 598 // insert or expand existing committed region to cover this 599 // newly committed region 600 if (!vm_snapshot_itr.add_committed_region(new_rec)) { 601 return false; 602 } 603 } else if (new_rec->is_deallocation_record()) { 604 // release part or all memory region 605 if (!vm_snapshot_itr.remove_released_region(new_rec)) { 606 return false; 607 } 608 } else if (new_rec->is_type_tagging_record()) { 609 // tag this reserved virtual memory range to a memory type. Can not re-tag a memory range 610 // to different type. 611 assert(FLAGS_TO_MEMORY_TYPE(reserved_rec->flags()) == mtNone || 612 FLAGS_TO_MEMORY_TYPE(reserved_rec->flags()) == FLAGS_TO_MEMORY_TYPE(new_rec->flags()), 613 "Sanity check"); 614 reserved_rec->tag(new_rec->flags()); 615 } else { 616 ShouldNotReachHere(); 617 } 618 } else { 619 /* 620 * The assertion failure indicates mis-matched virtual memory records. The likely 621 * scenario is, that some virtual memory operations are not going through os::xxxx_memory() 622 * api, which have to be tracked manually. (perfMemory is an example). 623 */ 624 assert(new_rec->is_allocation_record(), "Sanity check"); 625 if (!vm_snapshot_itr.add_reserved_region(new_rec)) { 626 return false; 627 } 628 } 629 new_rec = (MemPointerRecord*)itr->next(); 630 } 631 return true; 632 } 633 634 #ifndef PRODUCT 635 void MemSnapshot::print_snapshot_stats(outputStream* st) { 636 st->print_cr("Snapshot:"); 637 st->print_cr("\tMalloced: %d/%d [%5.2f%%] %dKB", _alloc_ptrs->length(), _alloc_ptrs->capacity(), 638 (100.0 * (float)_alloc_ptrs->length()) / (float)_alloc_ptrs->capacity(), _alloc_ptrs->instance_size()/K); 639 640 st->print_cr("\tVM: %d/%d [%5.2f%%] %dKB", _vm_ptrs->length(), _vm_ptrs->capacity(), 641 (100.0 * (float)_vm_ptrs->length()) / (float)_vm_ptrs->capacity(), _vm_ptrs->instance_size()/K); 642 643 st->print_cr("\tMalloc staging Area: %d/%d [%5.2f%%] %dKB", _staging_area.malloc_data()->length(), 644 _staging_area.malloc_data()->capacity(), 645 (100.0 * (float)_staging_area.malloc_data()->length()) / (float)_staging_area.malloc_data()->capacity(), 646 _staging_area.malloc_data()->instance_size()/K); 647 648 st->print_cr("\tVirtual memory staging Area: %d/%d [%5.2f%%] %dKB", _staging_area.vm_data()->length(), 649 _staging_area.vm_data()->capacity(), 650 (100.0 * (float)_staging_area.vm_data()->length()) / (float)_staging_area.vm_data()->capacity(), 651 _staging_area.vm_data()->instance_size()/K); 652 653 st->print_cr("\tUntracked allocation: %d", _untracked_count); 654 } 655 656 void MemSnapshot::check_malloc_pointers() { 657 MemPointerArrayIteratorImpl mItr(_alloc_ptrs); 658 MemPointerRecord* p = (MemPointerRecord*)mItr.current(); 659 MemPointerRecord* prev = NULL; 660 while (p != NULL) { 661 if (prev != NULL) { 662 assert(p->addr() >= prev->addr(), "sorting order"); 663 } 664 prev = p; 665 p = (MemPointerRecord*)mItr.next(); 666 } 667 } 668 669 bool MemSnapshot::has_allocation_record(address addr) { 670 MemPointerArrayIteratorImpl itr(_staging_area.malloc_data()); 671 MemPointerRecord* cur = (MemPointerRecord*)itr.current(); 672 while (cur != NULL) { 673 if (cur->addr() == addr && cur->is_allocation_record()) { 674 return true; 675 } 676 cur = (MemPointerRecord*)itr.next(); 677 } 678 return false; 679 } 680 #endif // PRODUCT 681 682 #ifdef ASSERT 683 void MemSnapshot::check_staging_data() { 684 MemPointerArrayIteratorImpl itr(_staging_area.malloc_data()); 685 MemPointerRecord* cur = (MemPointerRecord*)itr.current(); 686 MemPointerRecord* next = (MemPointerRecord*)itr.next(); 687 while (next != NULL) { 688 assert((next->addr() > cur->addr()) || 689 ((next->flags() & MemPointerRecord::tag_masks) > 690 (cur->flags() & MemPointerRecord::tag_masks)), 691 "sorting order"); 692 cur = next; 693 next = (MemPointerRecord*)itr.next(); 694 } 695 696 MemPointerArrayIteratorImpl vm_itr(_staging_area.vm_data()); 697 cur = (MemPointerRecord*)vm_itr.current(); 698 while (cur != NULL) { 699 assert(cur->is_vm_pointer(), "virtual memory pointer only"); 700 cur = (MemPointerRecord*)vm_itr.next(); 701 } 702 } 703 704 void MemSnapshot::dump_all_vm_pointers() { 705 MemPointerArrayIteratorImpl itr(_vm_ptrs); 706 VMMemRegion* ptr = (VMMemRegion*)itr.current(); 707 tty->print_cr("dump virtual memory pointers:"); 708 while (ptr != NULL) { 709 if (ptr->is_committed_region()) { 710 tty->print("\t"); 711 } 712 tty->print("[" PTR_FORMAT " - " PTR_FORMAT "] [%x]", ptr->addr(), 713 (ptr->addr() + ptr->size()), ptr->flags()); 714 715 if (MemTracker::track_callsite()) { 716 VMMemRegionEx* ex = (VMMemRegionEx*)ptr; 717 if (ex->pc() != NULL) { 718 char buf[1024]; 719 if (os::dll_address_to_function_name(ex->pc(), buf, sizeof(buf), NULL)) { 720 tty->print_cr("\t%s", buf); 721 } else { 722 tty->print_cr(""); 723 } 724 } 725 } 726 727 ptr = (VMMemRegion*)itr.next(); 728 } 729 tty->flush(); 730 } 731 #endif // ASSERT 732