1 /*
   2  * Copyright (c) 2011, 2022, Oracle and/or its affiliates. All rights reserved.
   3  * Copyright (c) 2017, 2021 SAP SE. All rights reserved.
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This code is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 only, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  *
  24  */
  25 
  26 #include "precompiled.hpp"
  27 #include "cds/metaspaceShared.hpp"
  28 #include "classfile/classLoaderData.hpp"
  29 #include "gc/shared/collectedHeap.hpp"
  30 #include "logging/log.hpp"
  31 #include "logging/logStream.hpp"
  32 #include "memory/classLoaderMetaspace.hpp"
  33 #include "memory/metaspace.hpp"
  34 #include "memory/metaspaceCriticalAllocation.hpp"
  35 #include "memory/metaspace/chunkHeaderPool.hpp"
  36 #include "memory/metaspace/chunkManager.hpp"
  37 #include "memory/metaspace/commitLimiter.hpp"
  38 #include "memory/metaspace/internalStats.hpp"

  39 #include "memory/metaspace/metaspaceCommon.hpp"
  40 #include "memory/metaspace/metaspaceContext.hpp"
  41 #include "memory/metaspace/metaspaceReporter.hpp"
  42 #include "memory/metaspace/metaspaceSettings.hpp"
  43 #include "memory/metaspace/runningCounters.hpp"
  44 #include "memory/metaspace/virtualSpaceList.hpp"
  45 #include "memory/metaspaceTracer.hpp"
  46 #include "memory/metaspaceStats.hpp"
  47 #include "memory/metaspaceUtils.hpp"
  48 #include "memory/resourceArea.hpp"
  49 #include "memory/universe.hpp"
  50 #include "oops/compressedOops.hpp"
  51 #include "prims/jvmtiExport.hpp"
  52 #include "runtime/atomic.hpp"
  53 #include "runtime/globals_extension.hpp"
  54 #include "runtime/init.hpp"
  55 #include "runtime/java.hpp"
  56 #include "services/memTracker.hpp"
  57 #include "utilities/copy.hpp"
  58 #include "utilities/debug.hpp"
  59 #include "utilities/formatBuffer.hpp"
  60 #include "utilities/globalDefinitions.hpp"
  61 
  62 using metaspace::ChunkManager;
  63 using metaspace::CommitLimiter;
  64 using metaspace::MetaspaceContext;
  65 using metaspace::MetaspaceReporter;
  66 using metaspace::RunningCounters;
  67 using metaspace::VirtualSpaceList;
  68 
  69 size_t MetaspaceUtils::used_words() {
  70   return RunningCounters::used_words();
  71 }
  72 
  73 size_t MetaspaceUtils::used_words(Metaspace::MetadataType mdtype) {
  74   return mdtype == Metaspace::ClassType ? RunningCounters::used_words_class() : RunningCounters::used_words_nonclass();
  75 }
  76 
  77 size_t MetaspaceUtils::reserved_words() {
  78   return RunningCounters::reserved_words();
  79 }
  80 
  81 size_t MetaspaceUtils::reserved_words(Metaspace::MetadataType mdtype) {
  82   return mdtype == Metaspace::ClassType ? RunningCounters::reserved_words_class() : RunningCounters::reserved_words_nonclass();
  83 }
  84 
  85 size_t MetaspaceUtils::committed_words() {
  86   return RunningCounters::committed_words();
  87 }
  88 
  89 size_t MetaspaceUtils::committed_words(Metaspace::MetadataType mdtype) {
  90   return mdtype == Metaspace::ClassType ? RunningCounters::committed_words_class() : RunningCounters::committed_words_nonclass();
  91 }
  92 
  93 // Helper for get_statistics()
  94 static void get_values_for(Metaspace::MetadataType mdtype, size_t* reserved, size_t* committed, size_t* used) {
  95 #define w2b(x) (x * sizeof(MetaWord))
  96   if (mdtype == Metaspace::ClassType) {
  97     *reserved = w2b(RunningCounters::reserved_words_class());
  98     *committed = w2b(RunningCounters::committed_words_class());
  99     *used = w2b(RunningCounters::used_words_class());
 100   } else {
 101     *reserved = w2b(RunningCounters::reserved_words_nonclass());
 102     *committed = w2b(RunningCounters::committed_words_nonclass());
 103     *used = w2b(RunningCounters::used_words_nonclass());
 104   }
 105 #undef w2b
 106 }
 107 
 108 // Retrieve all statistics in one go; make sure the values are consistent.
 109 MetaspaceStats MetaspaceUtils::get_statistics(Metaspace::MetadataType mdtype) {
 110 
 111   // Consistency:
 112   // This function reads three values (reserved, committed, used) from different counters. These counters
 113   // may (very rarely) be out of sync. This has been a source for intermittent test errors in the past
 114   //  (see e.g. JDK-8237872, JDK-8151460).
 115   // - reserved and committed counter are updated under protection of Metaspace_lock; an inconsistency
 116   //   between them can be the result of a dirty read.
 117   // - used is an atomic counter updated outside any lock range; there is no way to guarantee
 118   //   a clean read wrt the other two values.
 119   // Reading these values under lock protection would would only help for the first case. Therefore
 120   //   we don't bother and just re-read several times, then give up and correct the values.
 121 
 122   size_t r = 0, c = 0, u = 0; // Note: byte values.
 123   get_values_for(mdtype, &r, &c, &u);
 124   int retries = 10;
 125   // If the first retrieval resulted in inconsistent values, retry a bit...
 126   while ((r < c || c < u) && --retries >= 0) {
 127     get_values_for(mdtype, &r, &c, &u);
 128   }
 129   if (c < u || r < c) { // still inconsistent.
 130     // ... but not endlessly. If we don't get consistent values, correct them on the fly.
 131     // The logic here is that we trust the used counter - its an atomic counter and whatever we see
 132     // must have been the truth once - and from that we reconstruct a likely set of committed/reserved
 133     // values.
 134     metaspace::InternalStats::inc_num_inconsistent_stats();
 135     if (c < u) {
 136       c = align_up(u, Metaspace::commit_alignment());
 137     }
 138     if (r < c) {
 139       r = align_up(c, Metaspace::reserve_alignment());
 140     }
 141   }
 142   return MetaspaceStats(r, c, u);
 143 }
 144 
 145 MetaspaceCombinedStats MetaspaceUtils::get_combined_statistics() {
 146   return MetaspaceCombinedStats(get_statistics(Metaspace::ClassType), get_statistics(Metaspace::NonClassType));
 147 }
 148 
 149 void MetaspaceUtils::print_metaspace_change(const MetaspaceCombinedStats& pre_meta_values) {
 150   // Get values now:
 151   const MetaspaceCombinedStats meta_values = get_combined_statistics();
 152 
 153   // We print used and committed since these are the most useful at-a-glance vitals for Metaspace:
 154   // - used tells you how much memory is actually used for metadata
 155   // - committed tells you how much memory is committed for the purpose of metadata
 156   // The difference between those two would be waste, which can have various forms (freelists,
 157   //   unused parts of committed chunks etc)
 158   //
 159   // Left out is reserved, since this is not as exciting as the first two values: for class space,
 160   // it is a constant (to uninformed users, often confusingly large). For non-class space, it would
 161   // be interesting since free chunks can be uncommitted, but for now it is left out.
 162 
 163   if (Metaspace::using_class_space()) {
 164     log_info(gc, metaspace)(HEAP_CHANGE_FORMAT" "
 165                             HEAP_CHANGE_FORMAT" "
 166                             HEAP_CHANGE_FORMAT,
 167                             HEAP_CHANGE_FORMAT_ARGS("Metaspace",
 168                                                     pre_meta_values.used(),
 169                                                     pre_meta_values.committed(),
 170                                                     meta_values.used(),
 171                                                     meta_values.committed()),
 172                             HEAP_CHANGE_FORMAT_ARGS("NonClass",
 173                                                     pre_meta_values.non_class_used(),
 174                                                     pre_meta_values.non_class_committed(),
 175                                                     meta_values.non_class_used(),
 176                                                     meta_values.non_class_committed()),
 177                             HEAP_CHANGE_FORMAT_ARGS("Class",
 178                                                     pre_meta_values.class_used(),
 179                                                     pre_meta_values.class_committed(),
 180                                                     meta_values.class_used(),
 181                                                     meta_values.class_committed()));
 182   } else {
 183     log_info(gc, metaspace)(HEAP_CHANGE_FORMAT,
 184                             HEAP_CHANGE_FORMAT_ARGS("Metaspace",
 185                                                     pre_meta_values.used(),
 186                                                     pre_meta_values.committed(),
 187                                                     meta_values.used(),
 188                                                     meta_values.committed()));
 189   }
 190 }
 191 
 192 // This will print out a basic metaspace usage report but
 193 // unlike print_report() is guaranteed not to lock or to walk the CLDG.
 194 void MetaspaceUtils::print_basic_report(outputStream* out, size_t scale) {
 195   MetaspaceReporter::print_basic_report(out, scale);
 196 }
 197 
 198 // Prints a report about the current metaspace state.
 199 // Optional parts can be enabled via flags.
 200 // Function will walk the CLDG and will lock the expand lock; if that is not
 201 // convenient, use print_basic_report() instead.
 202 void MetaspaceUtils::print_report(outputStream* out, size_t scale) {
 203   const int flags =
 204       (int)MetaspaceReporter::Option::ShowLoaders |
 205       (int)MetaspaceReporter::Option::BreakDownByChunkType |
 206       (int)MetaspaceReporter::Option::ShowClasses;
 207   MetaspaceReporter::print_report(out, scale, flags);
 208 }
 209 
 210 void MetaspaceUtils::print_on(outputStream* out) {
 211 
 212   // Used from all GCs. It first prints out totals, then, separately, the class space portion.
 213   MetaspaceCombinedStats stats = get_combined_statistics();
 214   out->print_cr(" Metaspace       "
 215                 "used "      SIZE_FORMAT "K, "
 216                 "committed " SIZE_FORMAT "K, "
 217                 "reserved "  SIZE_FORMAT "K",
 218                 stats.used()/K,
 219                 stats.committed()/K,
 220                 stats.reserved()/K);
 221 
 222   if (Metaspace::using_class_space()) {
 223     out->print_cr("  class space    "
 224                   "used "      SIZE_FORMAT "K, "
 225                   "committed " SIZE_FORMAT "K, "
 226                   "reserved "  SIZE_FORMAT "K",
 227                   stats.class_space_stats().used()/K,
 228                   stats.class_space_stats().committed()/K,
 229                   stats.class_space_stats().reserved()/K);
 230   }
 231 }
 232 
 233 #ifdef ASSERT
 234 void MetaspaceUtils::verify() {
 235   if (Metaspace::initialized()) {
 236 
 237     // Verify non-class chunkmanager...
 238     ChunkManager* cm = ChunkManager::chunkmanager_nonclass();
 239     cm->verify();
 240 
 241     // ... and space list.
 242     VirtualSpaceList* vsl = VirtualSpaceList::vslist_nonclass();
 243     vsl->verify();
 244 
 245     if (Metaspace::using_class_space()) {
 246       // If we use compressed class pointers, verify class chunkmanager...
 247       cm = ChunkManager::chunkmanager_class();
 248       cm->verify();
 249 
 250       // ... and class spacelist.
 251       vsl = VirtualSpaceList::vslist_class();
 252       vsl->verify();
 253     }
 254 
 255   }
 256 }
 257 #endif
 258 
 259 ////////////////////////////////7
 260 // MetaspaceGC methods
 261 
 262 volatile size_t MetaspaceGC::_capacity_until_GC = 0;
 263 uint MetaspaceGC::_shrink_factor = 0;
 264 
 265 // VM_CollectForMetadataAllocation is the vm operation used to GC.
 266 // Within the VM operation after the GC the attempt to allocate the metadata
 267 // should succeed.  If the GC did not free enough space for the metaspace
 268 // allocation, the HWM is increased so that another virtualspace will be
 269 // allocated for the metadata.  With perm gen the increase in the perm
 270 // gen had bounds, MinMetaspaceExpansion and MaxMetaspaceExpansion.  The
 271 // metaspace policy uses those as the small and large steps for the HWM.
 272 //
 273 // After the GC the compute_new_size() for MetaspaceGC is called to
 274 // resize the capacity of the metaspaces.  The current implementation
 275 // is based on the flags MinMetaspaceFreeRatio and MaxMetaspaceFreeRatio used
 276 // to resize the Java heap by some GC's.  New flags can be implemented
 277 // if really needed.  MinMetaspaceFreeRatio is used to calculate how much
 278 // free space is desirable in the metaspace capacity to decide how much
 279 // to increase the HWM.  MaxMetaspaceFreeRatio is used to decide how much
 280 // free space is desirable in the metaspace capacity before decreasing
 281 // the HWM.
 282 
 283 // Calculate the amount to increase the high water mark (HWM).
 284 // Increase by a minimum amount (MinMetaspaceExpansion) so that
 285 // another expansion is not requested too soon.  If that is not
 286 // enough to satisfy the allocation, increase by MaxMetaspaceExpansion.
 287 // If that is still not enough, expand by the size of the allocation
 288 // plus some.
 289 size_t MetaspaceGC::delta_capacity_until_GC(size_t bytes) {
 290   size_t min_delta = MinMetaspaceExpansion;
 291   size_t max_delta = MaxMetaspaceExpansion;
 292   size_t delta = align_up(bytes, Metaspace::commit_alignment());
 293 
 294   if (delta <= min_delta) {
 295     delta = min_delta;
 296   } else if (delta <= max_delta) {
 297     // Don't want to hit the high water mark on the next
 298     // allocation so make the delta greater than just enough
 299     // for this allocation.
 300     delta = max_delta;
 301   } else {
 302     // This allocation is large but the next ones are probably not
 303     // so increase by the minimum.
 304     delta = delta + min_delta;
 305   }
 306 
 307   assert_is_aligned(delta, Metaspace::commit_alignment());
 308 
 309   return delta;
 310 }
 311 
 312 size_t MetaspaceGC::capacity_until_GC() {
 313   size_t value = Atomic::load_acquire(&_capacity_until_GC);
 314   assert(value >= MetaspaceSize, "Not initialized properly?");
 315   return value;
 316 }
 317 
 318 // Try to increase the _capacity_until_GC limit counter by v bytes.
 319 // Returns true if it succeeded. It may fail if either another thread
 320 // concurrently increased the limit or the new limit would be larger
 321 // than MaxMetaspaceSize.
 322 // On success, optionally returns new and old metaspace capacity in
 323 // new_cap_until_GC and old_cap_until_GC respectively.
 324 // On error, optionally sets can_retry to indicate whether if there is
 325 // actually enough space remaining to satisfy the request.
 326 bool MetaspaceGC::inc_capacity_until_GC(size_t v, size_t* new_cap_until_GC, size_t* old_cap_until_GC, bool* can_retry) {
 327   assert_is_aligned(v, Metaspace::commit_alignment());
 328 
 329   size_t old_capacity_until_GC = _capacity_until_GC;
 330   size_t new_value = old_capacity_until_GC + v;
 331 
 332   if (new_value < old_capacity_until_GC) {
 333     // The addition wrapped around, set new_value to aligned max value.
 334     new_value = align_down(max_uintx, Metaspace::reserve_alignment());
 335   }
 336 
 337   if (new_value > MaxMetaspaceSize) {
 338     if (can_retry != NULL) {
 339       *can_retry = false;
 340     }
 341     return false;
 342   }
 343 
 344   if (can_retry != NULL) {
 345     *can_retry = true;
 346   }
 347   size_t prev_value = Atomic::cmpxchg(&_capacity_until_GC, old_capacity_until_GC, new_value);
 348 
 349   if (old_capacity_until_GC != prev_value) {
 350     return false;
 351   }
 352 
 353   if (new_cap_until_GC != NULL) {
 354     *new_cap_until_GC = new_value;
 355   }
 356   if (old_cap_until_GC != NULL) {
 357     *old_cap_until_GC = old_capacity_until_GC;
 358   }
 359   return true;
 360 }
 361 
 362 size_t MetaspaceGC::dec_capacity_until_GC(size_t v) {
 363   assert_is_aligned(v, Metaspace::commit_alignment());
 364 
 365   return Atomic::sub(&_capacity_until_GC, v);
 366 }
 367 
 368 void MetaspaceGC::initialize() {
 369   // Set the high-water mark to MaxMetapaceSize during VM initializaton since
 370   // we can't do a GC during initialization.
 371   _capacity_until_GC = MaxMetaspaceSize;
 372 }
 373 
 374 void MetaspaceGC::post_initialize() {
 375   // Reset the high-water mark once the VM initialization is done.
 376   _capacity_until_GC = MAX2(MetaspaceUtils::committed_bytes(), MetaspaceSize);
 377 }
 378 
 379 bool MetaspaceGC::can_expand(size_t word_size, bool is_class) {
 380   // Check if the compressed class space is full.
 381   if (is_class && Metaspace::using_class_space()) {
 382     size_t class_committed = MetaspaceUtils::committed_bytes(Metaspace::ClassType);
 383     if (class_committed + word_size * BytesPerWord > CompressedClassSpaceSize) {
 384       log_trace(gc, metaspace, freelist)("Cannot expand %s metaspace by " SIZE_FORMAT " words (CompressedClassSpaceSize = " SIZE_FORMAT " words)",
 385                 (is_class ? "class" : "non-class"), word_size, CompressedClassSpaceSize / sizeof(MetaWord));
 386       return false;
 387     }
 388   }
 389 
 390   // Check if the user has imposed a limit on the metaspace memory.
 391   size_t committed_bytes = MetaspaceUtils::committed_bytes();
 392   if (committed_bytes + word_size * BytesPerWord > MaxMetaspaceSize) {
 393     log_trace(gc, metaspace, freelist)("Cannot expand %s metaspace by " SIZE_FORMAT " words (MaxMetaspaceSize = " SIZE_FORMAT " words)",
 394               (is_class ? "class" : "non-class"), word_size, MaxMetaspaceSize / sizeof(MetaWord));
 395     return false;
 396   }
 397 
 398   return true;
 399 }
 400 
 401 size_t MetaspaceGC::allowed_expansion() {
 402   size_t committed_bytes = MetaspaceUtils::committed_bytes();
 403   size_t capacity_until_gc = capacity_until_GC();
 404 
 405   assert(capacity_until_gc >= committed_bytes,
 406          "capacity_until_gc: " SIZE_FORMAT " < committed_bytes: " SIZE_FORMAT,
 407          capacity_until_gc, committed_bytes);
 408 
 409   size_t left_until_max  = MaxMetaspaceSize - committed_bytes;
 410   size_t left_until_GC = capacity_until_gc - committed_bytes;
 411   size_t left_to_commit = MIN2(left_until_GC, left_until_max);
 412   log_trace(gc, metaspace, freelist)("allowed expansion words: " SIZE_FORMAT
 413             " (left_until_max: " SIZE_FORMAT ", left_until_GC: " SIZE_FORMAT ".",
 414             left_to_commit / BytesPerWord, left_until_max / BytesPerWord, left_until_GC / BytesPerWord);
 415 
 416   return left_to_commit / BytesPerWord;
 417 }
 418 
 419 void MetaspaceGC::compute_new_size() {
 420   assert(_shrink_factor <= 100, "invalid shrink factor");
 421   uint current_shrink_factor = _shrink_factor;
 422   _shrink_factor = 0;
 423 
 424   // Using committed_bytes() for used_after_gc is an overestimation, since the
 425   // chunk free lists are included in committed_bytes() and the memory in an
 426   // un-fragmented chunk free list is available for future allocations.
 427   // However, if the chunk free lists becomes fragmented, then the memory may
 428   // not be available for future allocations and the memory is therefore "in use".
 429   // Including the chunk free lists in the definition of "in use" is therefore
 430   // necessary. Not including the chunk free lists can cause capacity_until_GC to
 431   // shrink below committed_bytes() and this has caused serious bugs in the past.
 432   const size_t used_after_gc = MetaspaceUtils::committed_bytes();
 433   const size_t capacity_until_GC = MetaspaceGC::capacity_until_GC();
 434 
 435   const double minimum_free_percentage = MinMetaspaceFreeRatio / 100.0;
 436   const double maximum_used_percentage = 1.0 - minimum_free_percentage;
 437 
 438   const double min_tmp = used_after_gc / maximum_used_percentage;
 439   size_t minimum_desired_capacity =
 440     (size_t)MIN2(min_tmp, double(MaxMetaspaceSize));
 441   // Don't shrink less than the initial generation size
 442   minimum_desired_capacity = MAX2(minimum_desired_capacity,
 443                                   MetaspaceSize);
 444 
 445   log_trace(gc, metaspace)("MetaspaceGC::compute_new_size: ");
 446   log_trace(gc, metaspace)("    minimum_free_percentage: %6.2f  maximum_used_percentage: %6.2f",
 447                            minimum_free_percentage, maximum_used_percentage);
 448   log_trace(gc, metaspace)("     used_after_gc       : %6.1fKB", used_after_gc / (double) K);
 449 
 450   size_t shrink_bytes = 0;
 451   if (capacity_until_GC < minimum_desired_capacity) {
 452     // If we have less capacity below the metaspace HWM, then
 453     // increment the HWM.
 454     size_t expand_bytes = minimum_desired_capacity - capacity_until_GC;
 455     expand_bytes = align_up(expand_bytes, Metaspace::commit_alignment());
 456     // Don't expand unless it's significant
 457     if (expand_bytes >= MinMetaspaceExpansion) {
 458       size_t new_capacity_until_GC = 0;
 459       bool succeeded = MetaspaceGC::inc_capacity_until_GC(expand_bytes, &new_capacity_until_GC);
 460       assert(succeeded, "Should always successfully increment HWM when at safepoint");
 461 
 462       Metaspace::tracer()->report_gc_threshold(capacity_until_GC,
 463                                                new_capacity_until_GC,
 464                                                MetaspaceGCThresholdUpdater::ComputeNewSize);
 465       log_trace(gc, metaspace)("    expanding:  minimum_desired_capacity: %6.1fKB  expand_bytes: %6.1fKB  MinMetaspaceExpansion: %6.1fKB  new metaspace HWM:  %6.1fKB",
 466                                minimum_desired_capacity / (double) K,
 467                                expand_bytes / (double) K,
 468                                MinMetaspaceExpansion / (double) K,
 469                                new_capacity_until_GC / (double) K);
 470     }
 471     return;
 472   }
 473 
 474   // No expansion, now see if we want to shrink
 475   // We would never want to shrink more than this
 476   assert(capacity_until_GC >= minimum_desired_capacity,
 477          SIZE_FORMAT " >= " SIZE_FORMAT,
 478          capacity_until_GC, minimum_desired_capacity);
 479   size_t max_shrink_bytes = capacity_until_GC - minimum_desired_capacity;
 480 
 481   // Should shrinking be considered?
 482   if (MaxMetaspaceFreeRatio < 100) {
 483     const double maximum_free_percentage = MaxMetaspaceFreeRatio / 100.0;
 484     const double minimum_used_percentage = 1.0 - maximum_free_percentage;
 485     const double max_tmp = used_after_gc / minimum_used_percentage;
 486     size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(MaxMetaspaceSize));
 487     maximum_desired_capacity = MAX2(maximum_desired_capacity,
 488                                     MetaspaceSize);
 489     log_trace(gc, metaspace)("    maximum_free_percentage: %6.2f  minimum_used_percentage: %6.2f",
 490                              maximum_free_percentage, minimum_used_percentage);
 491     log_trace(gc, metaspace)("    minimum_desired_capacity: %6.1fKB  maximum_desired_capacity: %6.1fKB",
 492                              minimum_desired_capacity / (double) K, maximum_desired_capacity / (double) K);
 493 
 494     assert(minimum_desired_capacity <= maximum_desired_capacity,
 495            "sanity check");
 496 
 497     if (capacity_until_GC > maximum_desired_capacity) {
 498       // Capacity too large, compute shrinking size
 499       shrink_bytes = capacity_until_GC - maximum_desired_capacity;
 500       // We don't want shrink all the way back to initSize if people call
 501       // System.gc(), because some programs do that between "phases" and then
 502       // we'd just have to grow the heap up again for the next phase.  So we
 503       // damp the shrinking: 0% on the first call, 10% on the second call, 40%
 504       // on the third call, and 100% by the fourth call.  But if we recompute
 505       // size without shrinking, it goes back to 0%.
 506       shrink_bytes = shrink_bytes / 100 * current_shrink_factor;
 507 
 508       shrink_bytes = align_down(shrink_bytes, Metaspace::commit_alignment());
 509 
 510       assert(shrink_bytes <= max_shrink_bytes,
 511              "invalid shrink size " SIZE_FORMAT " not <= " SIZE_FORMAT,
 512              shrink_bytes, max_shrink_bytes);
 513       if (current_shrink_factor == 0) {
 514         _shrink_factor = 10;
 515       } else {
 516         _shrink_factor = MIN2(current_shrink_factor * 4, (uint) 100);
 517       }
 518       log_trace(gc, metaspace)("    shrinking:  initThreshold: %.1fK  maximum_desired_capacity: %.1fK",
 519                                MetaspaceSize / (double) K, maximum_desired_capacity / (double) K);
 520       log_trace(gc, metaspace)("    shrink_bytes: %.1fK  current_shrink_factor: %d  new shrink factor: %d  MinMetaspaceExpansion: %.1fK",
 521                                shrink_bytes / (double) K, current_shrink_factor, _shrink_factor, MinMetaspaceExpansion / (double) K);
 522     }
 523   }
 524 
 525   // Don't shrink unless it's significant
 526   if (shrink_bytes >= MinMetaspaceExpansion &&
 527       ((capacity_until_GC - shrink_bytes) >= MetaspaceSize)) {
 528     size_t new_capacity_until_GC = MetaspaceGC::dec_capacity_until_GC(shrink_bytes);
 529     Metaspace::tracer()->report_gc_threshold(capacity_until_GC,
 530                                              new_capacity_until_GC,
 531                                              MetaspaceGCThresholdUpdater::ComputeNewSize);
 532   }
 533 }
 534 
 535 //////  Metaspace methods /////
 536 
 537 const MetaspaceTracer* Metaspace::_tracer = NULL;
 538 
 539 bool Metaspace::initialized() {
 540   return metaspace::MetaspaceContext::context_nonclass() != NULL
 541       LP64_ONLY(&& (using_class_space() ? Metaspace::class_space_is_initialized() : true));
 542 }
 543 
 544 #ifdef _LP64
 545 
 546 void Metaspace::print_compressed_class_space(outputStream* st) {
 547   if (VirtualSpaceList::vslist_class() != NULL) {
 548     MetaWord* base = VirtualSpaceList::vslist_class()->base_of_first_node();
 549     size_t size = VirtualSpaceList::vslist_class()->word_size_of_first_node();
 550     MetaWord* top = base + size;
 551     st->print("Compressed class space mapped at: " PTR_FORMAT "-" PTR_FORMAT ", reserved size: " SIZE_FORMAT,
 552                p2i(base), p2i(top), (top - base) * BytesPerWord);
 553     st->cr();
 554   }
 555 }
 556 
 557 // Given a prereserved space, use that to set up the compressed class space list.
 558 void Metaspace::initialize_class_space(ReservedSpace rs) {
 559   assert(rs.size() >= CompressedClassSpaceSize,
 560          SIZE_FORMAT " != " SIZE_FORMAT, rs.size(), CompressedClassSpaceSize);
 561   assert(using_class_space(), "Must be using class space");
 562 
 563   assert(rs.size() == CompressedClassSpaceSize, SIZE_FORMAT " != " SIZE_FORMAT,
 564          rs.size(), CompressedClassSpaceSize);
 565   assert(is_aligned(rs.base(), Metaspace::reserve_alignment()) &&
 566          is_aligned(rs.size(), Metaspace::reserve_alignment()),
 567          "wrong alignment");
 568 
 569   MetaspaceContext::initialize_class_space_context(rs);
 570 
 571   // This does currently not work because rs may be the result of a split
 572   // operation and NMT seems not to be able to handle splits.
 573   // Will be fixed with JDK-8243535.
 574   // MemTracker::record_virtual_memory_type((address)rs.base(), mtClass);
 575 
 576 }
 577 
 578 // Returns true if class space has been setup (initialize_class_space).
 579 bool Metaspace::class_space_is_initialized() {
 580   return MetaspaceContext::context_class() != NULL;
 581 }
 582 
 583 // Reserve a range of memory at an address suitable for en/decoding narrow
 584 // Klass pointers (see: CompressedClassPointers::is_valid_base()).
 585 // The returned address shall both be suitable as a compressed class pointers
 586 //  base, and aligned to Metaspace::reserve_alignment (which is equal to or a
 587 //  multiple of allocation granularity).
 588 // On error, returns an unreserved space.
 589 ReservedSpace Metaspace::reserve_address_space_for_compressed_classes(size_t size) {
 590 
 591 #if defined(AARCH64) || defined(PPC64)
 592   const size_t alignment = Metaspace::reserve_alignment();
 593 
 594   // AArch64: Try to align metaspace so that we can decode a compressed
 595   // klass with a single MOVK instruction. We can do this iff the
 596   // compressed class base is a multiple of 4G.
 597   // Additionally, above 32G, ensure the lower LogKlassAlignmentInBytes bits
 598   // of the upper 32-bits of the address are zero so we can handle a shift
 599   // when decoding.
 600 
 601   // PPC64: smaller heaps up to 2g will be mapped just below 4g. Then the
 602   // attempt to place the compressed class space just after the heap fails on
 603   // Linux 4.1.42 and higher because the launcher is loaded at 4g
 604   // (ELF_ET_DYN_BASE). In that case we reach here and search the address space
 605   // below 32g to get a zerobased CCS. For simplicity we reuse the search
 606   // strategy for AARCH64.
 607 
 608   static const struct {
 609     address from;
 610     address to;
 611     size_t increment;
 612   } search_ranges[] = {
 613     {  (address)(4*G),   (address)(32*G),   4*G, },
 614     {  (address)(32*G),  (address)(1024*G), (4 << LogKlassAlignmentInBytes) * G },
 615     {  NULL, NULL, 0 }
 616   };
 617 
 618   for (int i = 0; search_ranges[i].from != NULL; i ++) {
 619     address a = search_ranges[i].from;
 620     assert(CompressedKlassPointers::is_valid_base(a), "Sanity");
 621     while (a < search_ranges[i].to) {
 622       ReservedSpace rs(size, Metaspace::reserve_alignment(),
 623                        os::vm_page_size(), (char*)a);
 624       if (rs.is_reserved()) {
 625         assert(a == (address)rs.base(), "Sanity");
 626         return rs;
 627       }
 628       a +=  search_ranges[i].increment;
 629     }
 630   }
 631 #endif // defined(AARCH64) || defined(PPC64)
 632 
 633 #ifdef AARCH64
 634   // Note: on AARCH64, if the code above does not find any good placement, we
 635   // have no recourse. We return an empty space and the VM will exit.
 636   return ReservedSpace();
 637 #else
 638   // Default implementation: Just reserve anywhere.
 639   return ReservedSpace(size, Metaspace::reserve_alignment(), os::vm_page_size(), (char*)NULL);
 640 #endif // AARCH64
 641 }
 642 
 643 #endif // _LP64
 644 
 645 size_t Metaspace::reserve_alignment_words() {
 646   return metaspace::Settings::virtual_space_node_reserve_alignment_words();
 647 }
 648 
 649 size_t Metaspace::commit_alignment_words() {
 650   return metaspace::Settings::commit_granule_words();
 651 }
 652 
 653 void Metaspace::ergo_initialize() {
 654 
 655   // Must happen before using any setting from Settings::---
 656   metaspace::Settings::ergo_initialize();
 657 
 658   // MaxMetaspaceSize and CompressedClassSpaceSize:
 659   //
 660   // MaxMetaspaceSize is the maximum size, in bytes, of memory we are allowed
 661   //  to commit for the Metaspace.
 662   //  It is just a number; a limit we compare against before committing. It
 663   //  does not have to be aligned to anything.
 664   //  It gets used as compare value before attempting to increase the metaspace
 665   //  commit charge. It defaults to max_uintx (unlimited).
 666   //
 667   // CompressedClassSpaceSize is the size, in bytes, of the address range we
 668   //  pre-reserve for the compressed class space (if we use class space).
 669   //  This size has to be aligned to the metaspace reserve alignment (to the
 670   //  size of a root chunk). It gets aligned up from whatever value the caller
 671   //  gave us to the next multiple of root chunk size.
 672   //
 673   // Note: Strictly speaking MaxMetaspaceSize and CompressedClassSpaceSize have
 674   //  very little to do with each other. The notion often encountered:
 675   //  MaxMetaspaceSize = CompressedClassSpaceSize + <non-class metadata size>
 676   //  is subtly wrong: MaxMetaspaceSize can besmaller than CompressedClassSpaceSize,
 677   //  in which case we just would not be able to fully commit the class space range.
 678   //
 679   // We still adjust CompressedClassSpaceSize to reasonable limits, mainly to
 680   //  save on reserved space, and to make ergnonomics less confusing.
 681 
 682   MaxMetaspaceSize = MAX2(MaxMetaspaceSize, commit_alignment());
 683 
 684   if (UseCompressedClassPointers) {
 685     // Let CCS size not be larger than 80% of MaxMetaspaceSize. Note that is
 686     // grossly over-dimensioned for most usage scenarios; typical ratio of
 687     // class space : non class space usage is about 1:6. With many small classes,
 688     // it can get as low as 1:2. It is not a big deal though since ccs is only
 689     // reserved and will be committed on demand only.
 690     size_t max_ccs_size = MaxMetaspaceSize * 0.8;
 691     size_t adjusted_ccs_size = MIN2(CompressedClassSpaceSize, max_ccs_size);
 692 
 693     // CCS must be aligned to root chunk size, and be at least the size of one
 694     //  root chunk.
 695     adjusted_ccs_size = align_up(adjusted_ccs_size, reserve_alignment());
 696     adjusted_ccs_size = MAX2(adjusted_ccs_size, reserve_alignment());
 697 
 698     // Note: re-adjusting may have us left with a CompressedClassSpaceSize
 699     //  larger than MaxMetaspaceSize for very small values of MaxMetaspaceSize.
 700     //  Lets just live with that, its not a big deal.
 701 
 702     if (adjusted_ccs_size != CompressedClassSpaceSize) {
 703       FLAG_SET_ERGO(CompressedClassSpaceSize, adjusted_ccs_size);
 704       log_info(metaspace)("Setting CompressedClassSpaceSize to " SIZE_FORMAT ".",
 705                           CompressedClassSpaceSize);
 706     }
 707   }
 708 
 709   // Set MetaspaceSize, MinMetaspaceExpansion and MaxMetaspaceExpansion
 710   if (MetaspaceSize > MaxMetaspaceSize) {
 711     MetaspaceSize = MaxMetaspaceSize;
 712   }
 713 
 714   MetaspaceSize = align_down_bounded(MetaspaceSize, commit_alignment());
 715 
 716   assert(MetaspaceSize <= MaxMetaspaceSize, "MetaspaceSize should be limited by MaxMetaspaceSize");
 717 
 718   MinMetaspaceExpansion = align_down_bounded(MinMetaspaceExpansion, commit_alignment());
 719   MaxMetaspaceExpansion = align_down_bounded(MaxMetaspaceExpansion, commit_alignment());
 720 
 721 }
 722 
 723 void Metaspace::global_initialize() {
 724   MetaspaceGC::initialize(); // <- since we do not prealloc init chunks anymore is this still needed?
 725 
 726   metaspace::ChunkHeaderPool::initialize();
 727 
 728   if (DumpSharedSpaces) {
 729     assert(!UseSharedSpaces, "sanity");
 730     MetaspaceShared::initialize_for_static_dump();
 731   }
 732 
 733   // If UseCompressedClassPointers=1, we have two cases:
 734   // a) if CDS is active (runtime, Xshare=on), it will create the class space
 735   //    for us, initialize it and set up CompressedKlassPointers encoding.
 736   //    Class space will be reserved above the mapped archives.
 737   // b) if CDS either deactivated (Xshare=off) or a static dump is to be done (Xshare:dump),
 738   //    we will create the class space on our own. It will be placed above the java heap,
 739   //    since we assume it has been placed in low
 740   //    address regions. We may rethink this (see JDK-8244943). Failing that,
 741   //    it will be placed anywhere.
 742 
 743 #if INCLUDE_CDS
 744   // case (a)
 745   if (UseSharedSpaces) {
 746     if (!FLAG_IS_DEFAULT(CompressedClassSpaceBaseAddress)) {
 747       log_warning(metaspace)("CDS active - ignoring CompressedClassSpaceBaseAddress.");
 748     }
 749     MetaspaceShared::initialize_runtime_shared_and_meta_spaces();
 750     // If any of the archived space fails to map, UseSharedSpaces
 751     // is reset to false.
 752   }
 753 #endif // INCLUDE_CDS
 754 
 755 #ifdef _LP64
 756 
 757   if (using_class_space() && !class_space_is_initialized()) {
 758     assert(!UseSharedSpaces, "CDS archive is not mapped at this point");
 759 
 760     // case (b) (No CDS)
 761     ReservedSpace rs;
 762     const size_t size = align_up(CompressedClassSpaceSize, Metaspace::reserve_alignment());
 763     address base = NULL;
 764 
 765     // If CompressedClassSpaceBaseAddress is set, we attempt to force-map class space to
 766     // the given address. This is a debug-only feature aiding tests. Due to the ASLR lottery
 767     // this may fail, in which case the VM will exit after printing an appropriate message.
 768     // Tests using this switch should cope with that.
 769     if (CompressedClassSpaceBaseAddress != 0) {
 770       base = (address)CompressedClassSpaceBaseAddress;
 771       if (!is_aligned(base, Metaspace::reserve_alignment())) {
 772         vm_exit_during_initialization(
 773             err_msg("CompressedClassSpaceBaseAddress=" PTR_FORMAT " invalid "
 774                     "(must be aligned to " SIZE_FORMAT_HEX ").",
 775                     CompressedClassSpaceBaseAddress, Metaspace::reserve_alignment()));
 776       }
 777       rs = ReservedSpace(size, Metaspace::reserve_alignment(),
 778                          os::vm_page_size() /* large */, (char*)base);
 779       if (rs.is_reserved()) {
 780         log_info(metaspace)("Successfully forced class space address to " PTR_FORMAT, p2i(base));
 781       } else {
 782         vm_exit_during_initialization(
 783             err_msg("CompressedClassSpaceBaseAddress=" PTR_FORMAT " given, but reserving class space failed.",
 784                 CompressedClassSpaceBaseAddress));
 785       }
 786     }
 787 
 788     if (!rs.is_reserved()) {
 789       // If UseCompressedOops=1 and the java heap has been placed in coops-friendly
 790       //  territory, i.e. its base is under 32G, then we attempt to place ccs
 791       //  right above the java heap.
 792       // Otherwise the lower 32G are still free. We try to place ccs at the lowest
 793       // allowed mapping address.
 794       base = (UseCompressedOops && (uint64_t)CompressedOops::base() < OopEncodingHeapMax) ?
 795               CompressedOops::end() : (address)HeapBaseMinAddress;
 796       base = align_up(base, Metaspace::reserve_alignment());
 797 
 798       if (base != NULL) {
 799         if (CompressedKlassPointers::is_valid_base(base)) {
 800           rs = ReservedSpace(size, Metaspace::reserve_alignment(),
 801                              os::vm_page_size(), (char*)base);
 802         }
 803       }
 804     }
 805 
 806     // ...failing that, reserve anywhere, but let platform do optimized placement:
 807     if (!rs.is_reserved()) {
 808       rs = Metaspace::reserve_address_space_for_compressed_classes(size);
 809     }
 810 
 811     // ...failing that, give up.
 812     if (!rs.is_reserved()) {
 813       vm_exit_during_initialization(
 814           err_msg("Could not allocate compressed class space: " SIZE_FORMAT " bytes",
 815                    CompressedClassSpaceSize));
 816     }
 817 
 818     // Initialize space
 819     Metaspace::initialize_class_space(rs);
 820 
 821     // Set up compressed class pointer encoding.
 822     CompressedKlassPointers::initialize((address)rs.base(), rs.size());
 823   }
 824 
 825 #endif
 826 
 827   // Initialize non-class virtual space list, and its chunk manager:
 828   MetaspaceContext::initialize_nonclass_space_context();
 829 
 830   _tracer = new MetaspaceTracer();
 831 
 832   // We must prevent the very first address of the ccs from being used to store
 833   // metadata, since that address would translate to a narrow pointer of 0, and the
 834   // VM does not distinguish between "narrow 0 as in NULL" and "narrow 0 as in start
 835   //  of ccs".
 836   // Before Elastic Metaspace that did not happen due to the fact that every Metachunk
 837   // had a header and therefore could not allocate anything at offset 0.
 838 #ifdef _LP64
 839   if (using_class_space()) {
 840     // The simplest way to fix this is to allocate a tiny dummy chunk right at the
 841     // start of ccs and do not use it for anything.
 842     MetaspaceContext::context_class()->cm()->get_chunk(metaspace::chunklevel::HIGHEST_CHUNK_LEVEL);
 843   }
 844 #endif
 845 
 846 #ifdef _LP64
 847   if (UseCompressedClassPointers) {
 848     // Note: "cds" would be a better fit but keep this for backward compatibility.
 849     LogTarget(Info, gc, metaspace) lt;
 850     if (lt.is_enabled()) {
 851       ResourceMark rm;
 852       LogStream ls(lt);
 853       CDS_ONLY(MetaspaceShared::print_on(&ls);)
 854       Metaspace::print_compressed_class_space(&ls);
 855       CompressedKlassPointers::print_mode(&ls);
 856     }
 857   }
 858 #endif
 859 
 860 }
 861 
 862 void Metaspace::post_initialize() {
 863   MetaspaceGC::post_initialize();
 864 }
 865 
 866 size_t Metaspace::max_allocation_word_size() {
 867   return metaspace::chunklevel::MAX_CHUNK_WORD_SIZE;
 868 }
 869 














 870 // This version of Metaspace::allocate does not throw OOM but simply returns NULL, and
 871 // is suitable for calling from non-Java threads.
 872 // Callers are responsible for checking null.
 873 MetaWord* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size,
 874                               MetaspaceObj::Type type) {
 875   assert(word_size <= Metaspace::max_allocation_word_size(),
 876          "allocation size too large (" SIZE_FORMAT ")", word_size);
 877 
 878   assert(loader_data != NULL, "Should never pass around a NULL loader_data. "
 879         "ClassLoaderData::the_null_class_loader_data() should have been used.");
 880 
 881   // Deal with concurrent unloading failed allocation starvation
 882   MetaspaceCriticalAllocation::block_if_concurrent_purge();
 883 
 884   MetadataType mdtype = (type == MetaspaceObj::ClassType) ? ClassType : NonClassType;
 885 
 886   // Try to allocate metadata.
 887   MetaWord* result = loader_data->metaspace_non_null()->allocate(word_size, mdtype);
 888 
 889   if (result != NULL) {
 890     // Zero initialize.
 891     Copy::fill_to_words((HeapWord*)result, word_size, 0);
 892 
 893     log_trace(metaspace)("Metaspace::allocate: type %d return " PTR_FORMAT ".", (int)type, p2i(result));
 894   }
 895 
 896   return result;
 897 }
 898 
 899 MetaWord* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size,
 900                               MetaspaceObj::Type type, TRAPS) {
 901 
 902   if (HAS_PENDING_EXCEPTION) {
 903     assert(false, "Should not allocate with exception pending");
 904     return NULL;  // caller does a CHECK_NULL too
 905   }
 906 
 907   MetaWord* result = allocate(loader_data, word_size, type);
 908 
 909   if (result == NULL) {
 910     MetadataType mdtype = (type == MetaspaceObj::ClassType) ? ClassType : NonClassType;
 911     tracer()->report_metaspace_allocation_failure(loader_data, word_size, type, mdtype);
 912 
 913     // Allocation failed.
 914     if (is_init_completed()) {
 915       // Only start a GC if the bootstrapping has completed.
 916       // Try to clean out some heap memory and retry. This can prevent premature
 917       // expansion of the metaspace.
 918       result = Universe::heap()->satisfy_failed_metadata_allocation(loader_data, word_size, mdtype);
 919     }
 920 
 921     if (result == NULL) {
 922       report_metadata_oome(loader_data, word_size, type, mdtype, THREAD);
 923       assert(HAS_PENDING_EXCEPTION, "sanity");
 924       return NULL;
 925     }
 926 
 927     // Zero initialize.
 928     Copy::fill_to_words((HeapWord*)result, word_size, 0);
 929 
 930     log_trace(metaspace)("Metaspace::allocate: type %d return " PTR_FORMAT ".", (int)type, p2i(result));
 931   }
 932 
 933   return result;
 934 }
 935 
 936 void Metaspace::report_metadata_oome(ClassLoaderData* loader_data, size_t word_size, MetaspaceObj::Type type, MetadataType mdtype, TRAPS) {
 937   tracer()->report_metadata_oom(loader_data, word_size, type, mdtype);
 938 
 939   // If result is still null, we are out of memory.
 940   Log(gc, metaspace, freelist, oom) log;
 941   if (log.is_info()) {
 942     log.info("Metaspace (%s) allocation failed for size " SIZE_FORMAT,
 943              is_class_space_allocation(mdtype) ? "class" : "data", word_size);
 944     ResourceMark rm;
 945     if (log.is_debug()) {
 946       if (loader_data->metaspace_or_null() != NULL) {
 947         LogStream ls(log.debug());
 948         loader_data->print_value_on(&ls);
 949       }
 950     }
 951     LogStream ls(log.info());
 952     // In case of an OOM, log out a short but still useful report.
 953     MetaspaceUtils::print_basic_report(&ls, 0);
 954   }
 955 
 956   bool out_of_compressed_class_space = false;
 957   if (is_class_space_allocation(mdtype)) {
 958     ClassLoaderMetaspace* metaspace = loader_data->metaspace_non_null();
 959     out_of_compressed_class_space =
 960       MetaspaceUtils::committed_bytes(Metaspace::ClassType) +
 961       align_up(word_size * BytesPerWord, 4 * M) >
 962       CompressedClassSpaceSize;
 963   }
 964 
 965   // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support
 966   const char* space_string = out_of_compressed_class_space ?
 967     "Compressed class space" : "Metaspace";
 968 
 969   report_java_out_of_memory(space_string);
 970 
 971   if (JvmtiExport::should_post_resource_exhausted()) {
 972     JvmtiExport::post_resource_exhausted(
 973         JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR,
 974         space_string);
 975   }
 976 
 977   if (!is_init_completed()) {
 978     vm_exit_during_initialization("OutOfMemoryError", space_string);
 979   }
 980 
 981   if (out_of_compressed_class_space) {
 982     THROW_OOP(Universe::out_of_memory_error_class_metaspace());
 983   } else {
 984     THROW_OOP(Universe::out_of_memory_error_metaspace());
 985   }
 986 }
 987 
 988 const char* Metaspace::metadata_type_name(Metaspace::MetadataType mdtype) {
 989   switch (mdtype) {
 990     case Metaspace::ClassType: return "Class";
 991     case Metaspace::NonClassType: return "Metadata";
 992     default:
 993       assert(false, "Got bad mdtype: %d", (int) mdtype);
 994       return NULL;
 995   }
 996 }
 997 
 998 void Metaspace::purge() {
 999   // The MetaspaceCritical_lock is used by a concurrent GC to block out concurrent metaspace
1000   // allocations, that would starve critical metaspace allocations, that are about to throw
1001   // OOM if they fail; they need precedence for correctness.
1002   MutexLocker ml(MetaspaceCritical_lock, Mutex::_no_safepoint_check_flag);
1003   ChunkManager* cm = ChunkManager::chunkmanager_nonclass();
1004   if (cm != NULL) {
1005     cm->purge();
1006   }
1007   if (using_class_space()) {
1008     cm = ChunkManager::chunkmanager_class();
1009     if (cm != NULL) {
1010       cm->purge();
1011     }
1012   }
1013 
1014   MetaspaceCriticalAllocation::satisfy();
1015 }
1016 
1017 bool Metaspace::contains(const void* ptr) {
1018   if (MetaspaceShared::is_in_shared_metaspace(ptr)) {
1019     return true;
1020   }
1021   return contains_non_shared(ptr);
1022 }
1023 
1024 bool Metaspace::contains_non_shared(const void* ptr) {
1025   if (using_class_space() && VirtualSpaceList::vslist_class()->contains((MetaWord*)ptr)) {
1026      return true;
1027   }
1028 
1029   return VirtualSpaceList::vslist_nonclass()->contains((MetaWord*)ptr);
1030 }
--- EOF ---