1 /* 2 * Copyright (c) 2013, 2019, 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 #include "precompiled.hpp" 25 26 #include "logging/log.hpp" 27 #include "memory/metaspace.hpp" 28 #include "runtime/atomic.hpp" 29 #include "runtime/os.hpp" 30 #include "runtime/threadCritical.hpp" 31 #include "services/memTracker.hpp" 32 #include "services/threadStackTracker.hpp" 33 #include "services/virtualMemoryTracker.hpp" 34 35 size_t VirtualMemorySummary::_snapshot[CALC_OBJ_SIZE_IN_TYPE(VirtualMemorySnapshot, size_t)]; 36 37 void VirtualMemorySummary::initialize() { 38 assert(sizeof(_snapshot) >= sizeof(VirtualMemorySnapshot), "Sanity Check"); 39 // Use placement operator new to initialize static data area. 40 ::new ((void*)_snapshot) VirtualMemorySnapshot(); 41 } 42 43 void VirtualMemorySummary::snapshot(VirtualMemorySnapshot* s) { 44 // Only if thread stack is backed by virtual memory 45 if (ThreadStackTracker::track_as_vm()) { 46 // Snapshot current thread stacks 47 VirtualMemoryTracker::snapshot_thread_stacks(); 48 as_snapshot()->copy_to(s); 49 } 50 } 51 52 SortedLinkedList<ReservedMemoryRegion, compare_reserved_region_base>* VirtualMemoryTracker::_reserved_regions; 53 54 int compare_committed_region(const CommittedMemoryRegion& r1, const CommittedMemoryRegion& r2) { 55 return r1.compare(r2); 56 } 57 58 int compare_reserved_region_base(const ReservedMemoryRegion& r1, const ReservedMemoryRegion& r2) { 59 return r1.compare(r2); 60 } 61 62 static bool is_mergeable_with(CommittedMemoryRegion* rgn, address addr, size_t size, const NativeCallStack& stack) { 63 return rgn->adjacent_to(addr, size) && rgn->call_stack()->equals(stack); 64 } 65 66 static bool is_same_as(CommittedMemoryRegion* rgn, address addr, size_t size, const NativeCallStack& stack) { 67 // It would have made sense to use rgn->equals(...), but equals returns true for overlapping regions. 68 return rgn->same_region(addr, size) && rgn->call_stack()->equals(stack); 69 } 70 71 static LinkedListNode<CommittedMemoryRegion>* find_preceding_node_from(LinkedListNode<CommittedMemoryRegion>* from, address addr) { 72 LinkedListNode<CommittedMemoryRegion>* preceding = NULL; 73 74 for (LinkedListNode<CommittedMemoryRegion>* node = from; node != NULL; node = node->next()) { 75 CommittedMemoryRegion* rgn = node->data(); 76 77 // We searched past the region start. 78 if (rgn->end() > addr) { 79 break; 80 } 81 82 preceding = node; 83 } 84 85 return preceding; 86 } 87 88 static bool try_merge_with(LinkedListNode<CommittedMemoryRegion>* node, address addr, size_t size, const NativeCallStack& stack) { 89 if (node != NULL) { 90 CommittedMemoryRegion* rgn = node->data(); 91 92 if (is_mergeable_with(rgn, addr, size, stack)) { 93 rgn->expand_region(addr, size); 94 return true; 95 } 96 } 97 98 return false; 99 } 100 101 static bool try_merge_with(LinkedListNode<CommittedMemoryRegion>* node, LinkedListNode<CommittedMemoryRegion>* other) { 102 if (other == NULL) { 103 return false; 104 } 105 106 CommittedMemoryRegion* rgn = other->data(); 107 return try_merge_with(node, rgn->base(), rgn->size(), *rgn->call_stack()); 108 } 109 110 bool ReservedMemoryRegion::add_committed_region(address addr, size_t size, const NativeCallStack& stack) { 111 assert(addr != NULL, "Invalid address"); 112 assert(size > 0, "Invalid size"); 113 assert(contain_region(addr, size), "Not contain this region"); 114 115 // Find the region that fully precedes the [addr, addr + size) region. 116 LinkedListNode<CommittedMemoryRegion>* prev = find_preceding_node_from(_committed_regions.head(), addr); 117 LinkedListNode<CommittedMemoryRegion>* next = (prev != NULL ? prev->next() : _committed_regions.head()); 118 119 if (next != NULL) { 120 // Ignore request if region already exists. 121 if (is_same_as(next->data(), addr, size, stack)) { 122 return true; 123 } 124 125 // The new region is after prev, and either overlaps with the 126 // next region (and maybe more regions), or overlaps with no region. 127 if (next->data()->overlap_region(addr, size)) { 128 // Remove _all_ overlapping regions, and parts of regions, 129 // in preparation for the addition of this new region. 130 remove_uncommitted_region(addr, size); 131 132 // The remove could have split a region into two and created a 133 // new prev region. Need to reset the prev and next pointers. 134 prev = find_preceding_node_from((prev != NULL ? prev : _committed_regions.head()), addr); 135 next = (prev != NULL ? prev->next() : _committed_regions.head()); 136 } 137 } 138 139 // At this point the previous overlapping regions have been 140 // cleared, and the full region is guaranteed to be inserted. 141 VirtualMemorySummary::record_committed_memory(size, flag()); 142 143 // Try to merge with prev and possibly next. 144 if (try_merge_with(prev, addr, size, stack)) { 145 if (try_merge_with(prev, next)) { 146 // prev was expanded to contain the new region 147 // and next, need to remove next from the list 148 _committed_regions.remove_after(prev); 149 } 150 151 return true; 152 } 153 154 // Didn't merge with prev, try with next. 155 if (try_merge_with(next, addr, size, stack)) { 156 return true; 157 } 158 159 // Couldn't merge with any regions - create a new region. 160 return add_committed_region(CommittedMemoryRegion(addr, size, stack)); 161 } 162 163 bool ReservedMemoryRegion::remove_uncommitted_region(LinkedListNode<CommittedMemoryRegion>* node, 164 address addr, size_t size) { 165 assert(addr != NULL, "Invalid address"); 166 assert(size > 0, "Invalid size"); 167 168 CommittedMemoryRegion* rgn = node->data(); 169 assert(rgn->contain_region(addr, size), "Has to be contained"); 170 assert(!rgn->same_region(addr, size), "Can not be the same region"); 171 172 if (rgn->base() == addr || 173 rgn->end() == addr + size) { 174 rgn->exclude_region(addr, size); 175 return true; 176 } else { 177 // split this region 178 address top =rgn->end(); 179 // use this region for lower part 180 size_t exclude_size = rgn->end() - addr; 181 rgn->exclude_region(addr, exclude_size); 182 183 // higher part 184 address high_base = addr + size; 185 size_t high_size = top - high_base; 186 187 CommittedMemoryRegion high_rgn(high_base, high_size, *rgn->call_stack()); 188 LinkedListNode<CommittedMemoryRegion>* high_node = _committed_regions.add(high_rgn); 189 assert(high_node == NULL || node->next() == high_node, "Should be right after"); 190 return (high_node != NULL); 191 } 192 193 return false; 194 } 195 196 bool ReservedMemoryRegion::remove_uncommitted_region(address addr, size_t sz) { 197 assert(addr != NULL, "Invalid address"); 198 assert(sz > 0, "Invalid size"); 199 200 CommittedMemoryRegion del_rgn(addr, sz, *call_stack()); 201 address end = addr + sz; 202 203 LinkedListNode<CommittedMemoryRegion>* head = _committed_regions.head(); 204 LinkedListNode<CommittedMemoryRegion>* prev = NULL; 205 CommittedMemoryRegion* crgn; 206 207 while (head != NULL) { 208 crgn = head->data(); 209 210 if (crgn->same_region(addr, sz)) { 211 VirtualMemorySummary::record_uncommitted_memory(crgn->size(), flag()); 212 _committed_regions.remove_after(prev); 213 return true; 214 } 215 216 // del_rgn contains crgn 217 if (del_rgn.contain_region(crgn->base(), crgn->size())) { 218 VirtualMemorySummary::record_uncommitted_memory(crgn->size(), flag()); 219 head = head->next(); 220 _committed_regions.remove_after(prev); 221 continue; // don't update head or prev 222 } 223 224 // Found addr in the current crgn. There are 2 subcases: 225 if (crgn->contain_address(addr)) { 226 227 // (1) Found addr+size in current crgn as well. (del_rgn is contained in crgn) 228 if (crgn->contain_address(end - 1)) { 229 VirtualMemorySummary::record_uncommitted_memory(sz, flag()); 230 return remove_uncommitted_region(head, addr, sz); // done! 231 } else { 232 // (2) Did not find del_rgn's end in crgn. 233 size_t size = crgn->end() - del_rgn.base(); 234 crgn->exclude_region(addr, size); 235 VirtualMemorySummary::record_uncommitted_memory(size, flag()); 236 } 237 238 } else if (crgn->contain_address(end - 1)) { 239 // Found del_rgn's end, but not its base addr. 240 size_t size = del_rgn.end() - crgn->base(); 241 crgn->exclude_region(crgn->base(), size); 242 VirtualMemorySummary::record_uncommitted_memory(size, flag()); 243 return true; // should be done if the list is sorted properly! 244 } 245 246 prev = head; 247 head = head->next(); 248 } 249 250 return true; 251 } 252 253 void ReservedMemoryRegion::move_committed_regions(address addr, ReservedMemoryRegion& rgn) { 254 assert(addr != NULL, "Invalid address"); 255 256 // split committed regions 257 LinkedListNode<CommittedMemoryRegion>* head = 258 _committed_regions.head(); 259 LinkedListNode<CommittedMemoryRegion>* prev = NULL; 260 261 while (head != NULL) { 262 if (head->data()->base() >= addr) { 263 break; 264 } 265 prev = head; 266 head = head->next(); 267 } 268 269 if (head != NULL) { 270 if (prev != NULL) { 271 prev->set_next(head->next()); 272 } else { 273 _committed_regions.set_head(NULL); 274 } 275 } 276 277 rgn._committed_regions.set_head(head); 278 } 279 280 size_t ReservedMemoryRegion::committed_size() const { 281 size_t committed = 0; 282 LinkedListNode<CommittedMemoryRegion>* head = 283 _committed_regions.head(); 284 while (head != NULL) { 285 committed += head->data()->size(); 286 head = head->next(); 287 } 288 return committed; 289 } 290 291 void ReservedMemoryRegion::set_flag(MEMFLAGS f) { 292 assert((flag() == mtNone || flag() == f), "Overwrite memory type"); 293 if (flag() != f) { 294 VirtualMemorySummary::move_reserved_memory(flag(), f, size()); 295 VirtualMemorySummary::move_committed_memory(flag(), f, committed_size()); 296 _flag = f; 297 } 298 } 299 300 address ReservedMemoryRegion::thread_stack_uncommitted_bottom() const { 301 assert(flag() == mtThreadStack, "Only for thread stack"); 302 LinkedListNode<CommittedMemoryRegion>* head = _committed_regions.head(); 303 address bottom = base(); 304 address top = base() + size(); 305 while (head != NULL) { 306 address committed_top = head->data()->base() + head->data()->size(); 307 if (committed_top < top) { 308 // committed stack guard pages, skip them 309 bottom = head->data()->base() + head->data()->size(); 310 head = head->next(); 311 } else { 312 assert(top == committed_top, "Sanity"); 313 break; 314 } 315 } 316 317 return bottom; 318 } 319 320 bool VirtualMemoryTracker::initialize(NMT_TrackingLevel level) { 321 if (level >= NMT_summary) { 322 VirtualMemorySummary::initialize(); 323 } 324 return true; 325 } 326 327 bool VirtualMemoryTracker::late_initialize(NMT_TrackingLevel level) { 328 if (level >= NMT_summary) { 329 _reserved_regions = new (std::nothrow, ResourceObj::C_HEAP, mtNMT) 330 SortedLinkedList<ReservedMemoryRegion, compare_reserved_region_base>(); 331 return (_reserved_regions != NULL); 332 } 333 return true; 334 } 335 336 bool VirtualMemoryTracker::add_reserved_region(address base_addr, size_t size, 337 const NativeCallStack& stack, MEMFLAGS flag) { 338 assert(base_addr != NULL, "Invalid address"); 339 assert(size > 0, "Invalid size"); 340 assert(_reserved_regions != NULL, "Sanity check"); 341 ReservedMemoryRegion rgn(base_addr, size, stack, flag); 342 ReservedMemoryRegion* reserved_rgn = _reserved_regions->find(rgn); 343 344 if (reserved_rgn == NULL) { 345 VirtualMemorySummary::record_reserved_memory(size, flag); 346 return _reserved_regions->add(rgn) != NULL; 347 } else { 348 if (reserved_rgn->same_region(base_addr, size)) { 349 reserved_rgn->set_call_stack(stack); 350 reserved_rgn->set_flag(flag); 351 return true; 352 } else if (reserved_rgn->adjacent_to(base_addr, size)) { 353 VirtualMemorySummary::record_reserved_memory(size, flag); 354 reserved_rgn->expand_region(base_addr, size); 355 reserved_rgn->set_call_stack(stack); 356 return true; 357 } else { 358 // Overlapped reservation. 359 // It can happen when the regions are thread stacks, as JNI 360 // thread does not detach from VM before exits, and leads to 361 // leak JavaThread object 362 if (reserved_rgn->flag() == mtThreadStack) { 363 guarantee(!CheckJNICalls, "Attached JNI thread exited without being detached"); 364 // Overwrite with new region 365 366 // Release old region 367 VirtualMemorySummary::record_uncommitted_memory(reserved_rgn->committed_size(), reserved_rgn->flag()); 368 VirtualMemorySummary::record_released_memory(reserved_rgn->size(), reserved_rgn->flag()); 369 370 // Add new region 371 VirtualMemorySummary::record_reserved_memory(rgn.size(), flag); 372 373 *reserved_rgn = rgn; 374 return true; 375 } 376 377 // CDS mapping region. 378 // CDS reserves the whole region for mapping CDS archive, then maps each section into the region. 379 // NMT reports CDS as a whole. 380 if (reserved_rgn->flag() == mtClassShared) { 381 assert(reserved_rgn->contain_region(base_addr, size), "Reserved CDS region should contain this mapping region"); 382 return true; 383 } 384 385 // Mapped CDS string region. 386 // The string region(s) is part of the java heap. 387 if (reserved_rgn->flag() == mtJavaHeap) { 388 assert(reserved_rgn->contain_region(base_addr, size), "Reserved heap region should contain this mapping region"); 389 return true; 390 } 391 392 ShouldNotReachHere(); 393 return false; 394 } 395 } 396 } 397 398 void VirtualMemoryTracker::set_reserved_region_type(address addr, MEMFLAGS flag) { 399 assert(addr != NULL, "Invalid address"); 400 assert(_reserved_regions != NULL, "Sanity check"); 401 402 ReservedMemoryRegion rgn(addr, 1); 403 ReservedMemoryRegion* reserved_rgn = _reserved_regions->find(rgn); 404 if (reserved_rgn != NULL) { 405 assert(reserved_rgn->contain_address(addr), "Containment"); 406 if (reserved_rgn->flag() != flag) { 407 assert(reserved_rgn->flag() == mtNone, "Overwrite memory type"); 408 reserved_rgn->set_flag(flag); 409 } 410 } 411 } 412 413 bool VirtualMemoryTracker::add_committed_region(address addr, size_t size, 414 const NativeCallStack& stack) { 415 assert(addr != NULL, "Invalid address"); 416 assert(size > 0, "Invalid size"); 417 assert(_reserved_regions != NULL, "Sanity check"); 418 419 ReservedMemoryRegion rgn(addr, size); 420 ReservedMemoryRegion* reserved_rgn = _reserved_regions->find(rgn); 421 422 assert(reserved_rgn != NULL, "No reserved region"); 423 assert(reserved_rgn->contain_region(addr, size), "Not completely contained"); 424 bool result = reserved_rgn->add_committed_region(addr, size, stack); 425 return result; 426 } 427 428 bool VirtualMemoryTracker::remove_uncommitted_region(address addr, size_t size) { 429 assert(addr != NULL, "Invalid address"); 430 assert(size > 0, "Invalid size"); 431 assert(_reserved_regions != NULL, "Sanity check"); 432 433 ReservedMemoryRegion rgn(addr, size); 434 ReservedMemoryRegion* reserved_rgn = _reserved_regions->find(rgn); 435 assert(reserved_rgn != NULL, "No reserved region"); 436 assert(reserved_rgn->contain_region(addr, size), "Not completely contained"); 437 bool result = reserved_rgn->remove_uncommitted_region(addr, size); 438 return result; 439 } 440 441 bool VirtualMemoryTracker::remove_released_region(address addr, size_t size) { 442 assert(addr != NULL, "Invalid address"); 443 assert(size > 0, "Invalid size"); 444 assert(_reserved_regions != NULL, "Sanity check"); 445 446 ReservedMemoryRegion rgn(addr, size); 447 ReservedMemoryRegion* reserved_rgn = _reserved_regions->find(rgn); 448 449 assert(reserved_rgn != NULL, "No reserved region"); 450 451 // uncommit regions within the released region 452 if (!reserved_rgn->remove_uncommitted_region(addr, size)) { 453 return false; 454 } 455 456 if (reserved_rgn->flag() == mtClassShared && 457 reserved_rgn->contain_region(addr, size) && 458 !reserved_rgn->same_region(addr, size)) { 459 // This is an unmapped CDS region, which is part of the reserved shared 460 // memory region. 461 // See special handling in VirtualMemoryTracker::add_reserved_region also. 462 return true; 463 } 464 465 VirtualMemorySummary::record_released_memory(size, reserved_rgn->flag()); 466 467 if (reserved_rgn->same_region(addr, size)) { 468 return _reserved_regions->remove(rgn); 469 } else { 470 assert(reserved_rgn->contain_region(addr, size), "Not completely contained"); 471 if (reserved_rgn->base() == addr || 472 reserved_rgn->end() == addr + size) { 473 reserved_rgn->exclude_region(addr, size); 474 return true; 475 } else { 476 address top = reserved_rgn->end(); 477 address high_base = addr + size; 478 ReservedMemoryRegion high_rgn(high_base, top - high_base, 479 *reserved_rgn->call_stack(), reserved_rgn->flag()); 480 481 // use original region for lower region 482 reserved_rgn->exclude_region(addr, top - addr); 483 LinkedListNode<ReservedMemoryRegion>* new_rgn = _reserved_regions->add(high_rgn); 484 if (new_rgn == NULL) { 485 return false; 486 } else { 487 reserved_rgn->move_committed_regions(addr, *new_rgn->data()); 488 return true; 489 } 490 } 491 } 492 } 493 494 // Iterate the range, find committed region within its bound. 495 class RegionIterator : public StackObj { 496 private: 497 const address _start; 498 const size_t _size; 499 500 address _current_start; 501 size_t _current_size; 502 public: 503 RegionIterator(address start, size_t size) : 504 _start(start), _size(size), _current_start(start), _current_size(size) { 505 } 506 507 // return true if committed region is found 508 bool next_committed(address& start, size_t& size); 509 private: 510 address end() const { return _start + _size; } 511 }; 512 513 bool RegionIterator::next_committed(address& committed_start, size_t& committed_size) { 514 if (end() <= _current_start) return false; 515 516 const size_t page_sz = os::vm_page_size(); 517 assert(_current_start + _current_size == end(), "Must be"); 518 if (os::committed_in_range(_current_start, _current_size, committed_start, committed_size)) { 519 assert(committed_start != NULL, "Must be"); 520 assert(committed_size > 0 && is_aligned(committed_size, os::vm_page_size()), "Must be"); 521 522 size_t remaining_size = (_current_start + _current_size) - (committed_start + committed_size); 523 _current_start = committed_start + committed_size; 524 _current_size = remaining_size; 525 return true; 526 } else { 527 return false; 528 } 529 } 530 531 // Walk all known thread stacks, snapshot their committed ranges. 532 class SnapshotThreadStackWalker : public VirtualMemoryWalker { 533 public: 534 SnapshotThreadStackWalker() {} 535 536 bool do_allocation_site(const ReservedMemoryRegion* rgn) { 537 if (rgn->flag() == mtThreadStack) { 538 address stack_bottom = rgn->thread_stack_uncommitted_bottom(); 539 address committed_start; 540 size_t committed_size; 541 size_t stack_size = rgn->base() + rgn->size() - stack_bottom; 542 543 ReservedMemoryRegion* region = const_cast<ReservedMemoryRegion*>(rgn); 544 NativeCallStack ncs; // empty stack 545 546 RegionIterator itr(stack_bottom, stack_size); 547 DEBUG_ONLY(bool found_stack = false;) 548 while (itr.next_committed(committed_start, committed_size)) { 549 assert(committed_start != NULL, "Should not be null"); 550 assert(committed_size > 0, "Should not be 0"); 551 region->add_committed_region(committed_start, committed_size, ncs); 552 DEBUG_ONLY(found_stack = true;) 553 } 554 #ifdef ASSERT 555 if (!found_stack) { 556 log_debug(thread)("Thread exited without proper cleanup, may leak thread object"); 557 } 558 #endif 559 } 560 return true; 561 } 562 }; 563 564 void VirtualMemoryTracker::snapshot_thread_stacks() { 565 SnapshotThreadStackWalker walker; 566 walk_virtual_memory(&walker); 567 } 568 569 bool VirtualMemoryTracker::walk_virtual_memory(VirtualMemoryWalker* walker) { 570 assert(_reserved_regions != NULL, "Sanity check"); 571 ThreadCritical tc; 572 // Check that the _reserved_regions haven't been deleted. 573 if (_reserved_regions != NULL) { 574 LinkedListNode<ReservedMemoryRegion>* head = _reserved_regions->head(); 575 while (head != NULL) { 576 const ReservedMemoryRegion* rgn = head->peek(); 577 if (!walker->do_allocation_site(rgn)) { 578 return false; 579 } 580 head = head->next(); 581 } 582 } 583 return true; 584 } 585 586 // Transition virtual memory tracking level. 587 bool VirtualMemoryTracker::transition(NMT_TrackingLevel from, NMT_TrackingLevel to) { 588 assert (from != NMT_minimal, "cannot convert from the lowest tracking level to anything"); 589 if (to == NMT_minimal) { 590 assert(from == NMT_summary || from == NMT_detail, "Just check"); 591 // Clean up virtual memory tracking data structures. 592 ThreadCritical tc; 593 // Check for potential race with other thread calling transition 594 if (_reserved_regions != NULL) { 595 delete _reserved_regions; 596 _reserved_regions = NULL; 597 } 598 } 599 600 return true; 601 } 602 603 // Metaspace Support 604 MetaspaceSnapshot::MetaspaceSnapshot() { 605 for (int index = (int)Metaspace::ClassType; index < (int)Metaspace::MetadataTypeCount; index ++) { 606 Metaspace::MetadataType type = (Metaspace::MetadataType)index; 607 assert_valid_metadata_type(type); 608 _reserved_in_bytes[type] = 0; 609 _committed_in_bytes[type] = 0; 610 _used_in_bytes[type] = 0; 611 _free_in_bytes[type] = 0; 612 } 613 } 614 615 void MetaspaceSnapshot::snapshot(Metaspace::MetadataType type, MetaspaceSnapshot& mss) { 616 assert_valid_metadata_type(type); 617 618 mss._reserved_in_bytes[type] = MetaspaceUtils::reserved_bytes(type); 619 mss._committed_in_bytes[type] = MetaspaceUtils::committed_bytes(type); 620 mss._used_in_bytes[type] = MetaspaceUtils::used_bytes(type); 621 622 size_t free_in_bytes = (MetaspaceUtils::capacity_bytes(type) - MetaspaceUtils::used_bytes(type)) 623 + MetaspaceUtils::free_chunks_total_bytes(type) 624 + MetaspaceUtils::free_in_vs_bytes(type); 625 mss._free_in_bytes[type] = free_in_bytes; 626 } 627 628 void MetaspaceSnapshot::snapshot(MetaspaceSnapshot& mss) { 629 snapshot(Metaspace::ClassType, mss); 630 if (Metaspace::using_class_space()) { 631 snapshot(Metaspace::NonClassType, mss); 632 } 633 }