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src/hotspot/share/memory/metaspace.cpp

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rev 57380 : [mq]: metaspace-improvement


  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 "aot/aotLoader.hpp"
  27 #include "classfile/classLoaderDataGraph.hpp"
  28 #include "gc/shared/collectedHeap.hpp"
  29 #include "logging/log.hpp"
  30 #include "logging/logStream.hpp"
  31 #include "memory/filemap.hpp"
  32 #include "memory/metaspace.hpp"
  33 #include "memory/metaspace/chunkManager.hpp"

  34 #include "memory/metaspace/metachunk.hpp"
  35 #include "memory/metaspace/metaspaceCommon.hpp"
  36 #include "memory/metaspace/printCLDMetaspaceInfoClosure.hpp"
  37 #include "memory/metaspace/spaceManager.hpp"
  38 #include "memory/metaspace/virtualSpaceList.hpp"
  39 #include "memory/metaspaceShared.hpp"
  40 #include "memory/metaspaceTracer.hpp"
  41 #include "memory/universe.hpp"
  42 #include "oops/compressedOops.hpp"
  43 #include "runtime/init.hpp"
  44 #include "runtime/orderAccess.hpp"
  45 #include "services/memTracker.hpp"
  46 #include "utilities/copy.hpp"
  47 #include "utilities/debug.hpp"
  48 #include "utilities/formatBuffer.hpp"
  49 #include "utilities/globalDefinitions.hpp"
  50 #include "utilities/vmError.hpp"
  51 
  52 
  53 using namespace metaspace;
  54 
  55 MetaWord* last_allocated = 0;
  56 
  57 size_t Metaspace::_compressed_class_space_size;
  58 const MetaspaceTracer* Metaspace::_tracer = NULL;
  59 
  60 DEBUG_ONLY(bool Metaspace::_frozen = false;)
  61 
  62 static const char* space_type_name(Metaspace::MetaspaceType t) {
  63   const char* s = NULL;
  64   switch (t) {
  65     case Metaspace::StandardMetaspaceType: s = "Standard"; break;
  66     case Metaspace::BootMetaspaceType: s = "Boot"; break;
  67     case Metaspace::UnsafeAnonymousMetaspaceType: s = "UnsafeAnonymous"; break;
  68     case Metaspace::ReflectionMetaspaceType: s = "Reflection"; break;
  69     default: ShouldNotReachHere();
  70   }
  71   return s;
  72 }
  73 
  74 volatile size_t MetaspaceGC::_capacity_until_GC = 0;
  75 uint MetaspaceGC::_shrink_factor = 0;
  76 bool MetaspaceGC::_should_concurrent_collect = false;
  77 
  78 // BlockFreelist methods
  79 
  80 // VirtualSpaceNode methods
  81 
  82 // MetaspaceGC methods
  83 
  84 // VM_CollectForMetadataAllocation is the vm operation used to GC.
  85 // Within the VM operation after the GC the attempt to allocate the metadata
  86 // should succeed.  If the GC did not free enough space for the metaspace
  87 // allocation, the HWM is increased so that another virtualspace will be
  88 // allocated for the metadata.  With perm gen the increase in the perm
  89 // gen had bounds, MinMetaspaceExpansion and MaxMetaspaceExpansion.  The
  90 // metaspace policy uses those as the small and large steps for the HWM.
  91 //
  92 // After the GC the compute_new_size() for MetaspaceGC is called to
  93 // resize the capacity of the metaspaces.  The current implementation
  94 // is based on the flags MinMetaspaceFreeRatio and MaxMetaspaceFreeRatio used
  95 // to resize the Java heap by some GC's.  New flags can be implemented
  96 // if really needed.  MinMetaspaceFreeRatio is used to calculate how much
  97 // free space is desirable in the metaspace capacity to decide how much
  98 // to increase the HWM.  MaxMetaspaceFreeRatio is used to decide how much
  99 // free space is desirable in the metaspace capacity before decreasing
 100 // the HWM.
 101 
 102 // Calculate the amount to increase the high water mark (HWM).
 103 // Increase by a minimum amount (MinMetaspaceExpansion) so that
 104 // another expansion is not requested too soon.  If that is not
 105 // enough to satisfy the allocation, increase by MaxMetaspaceExpansion.
 106 // If that is still not enough, expand by the size of the allocation
 107 // plus some.
 108 size_t MetaspaceGC::delta_capacity_until_GC(size_t bytes) {
 109   size_t min_delta = MinMetaspaceExpansion;
 110   size_t max_delta = MaxMetaspaceExpansion;
 111   size_t delta = align_up(bytes, Metaspace::commit_alignment());
 112 
 113   if (delta <= min_delta) {
 114     delta = min_delta;
 115   } else if (delta <= max_delta) {
 116     // Don't want to hit the high water mark on the next
 117     // allocation so make the delta greater than just enough
 118     // for this allocation.
 119     delta = max_delta;
 120   } else {
 121     // This allocation is large but the next ones are probably not
 122     // so increase by the minimum.
 123     delta = delta + min_delta;
 124   }
 125 
 126   assert_is_aligned(delta, Metaspace::commit_alignment());
 127 
 128   return delta;
 129 }
 130 
 131 size_t MetaspaceGC::capacity_until_GC() {
 132   size_t value = OrderAccess::load_acquire(&_capacity_until_GC);
 133   assert(value >= MetaspaceSize, "Not initialized properly?");
 134   return value;
 135 }
 136 
 137 // Try to increase the _capacity_until_GC limit counter by v bytes.
 138 // Returns true if it succeeded. It may fail if either another thread
 139 // concurrently increased the limit or the new limit would be larger
 140 // than MaxMetaspaceSize.
 141 // On success, optionally returns new and old metaspace capacity in
 142 // new_cap_until_GC and old_cap_until_GC respectively.
 143 // On error, optionally sets can_retry to indicate whether if there is
 144 // actually enough space remaining to satisfy the request.
 145 bool MetaspaceGC::inc_capacity_until_GC(size_t v, size_t* new_cap_until_GC, size_t* old_cap_until_GC, bool* can_retry) {
 146   assert_is_aligned(v, Metaspace::commit_alignment());
 147 
 148   size_t old_capacity_until_GC = _capacity_until_GC;
 149   size_t new_value = old_capacity_until_GC + v;
 150 
 151   if (new_value < old_capacity_until_GC) {
 152     // The addition wrapped around, set new_value to aligned max value.
 153     new_value = align_down(max_uintx, Metaspace::commit_alignment());
 154   }
 155 
 156   if (new_value > MaxMetaspaceSize) {
 157     if (can_retry != NULL) {
 158       *can_retry = false;
 159     }
 160     return false;
 161   }
 162 
 163   if (can_retry != NULL) {
 164     *can_retry = true;
 165   }
 166   size_t prev_value = Atomic::cmpxchg(new_value, &_capacity_until_GC, old_capacity_until_GC);
 167 
 168   if (old_capacity_until_GC != prev_value) {
 169     return false;
 170   }
 171 
 172   if (new_cap_until_GC != NULL) {
 173     *new_cap_until_GC = new_value;
 174   }
 175   if (old_cap_until_GC != NULL) {
 176     *old_cap_until_GC = old_capacity_until_GC;
 177   }
 178   return true;
 179 }
 180 
 181 size_t MetaspaceGC::dec_capacity_until_GC(size_t v) {
 182   assert_is_aligned(v, Metaspace::commit_alignment());
 183 
 184   return Atomic::sub(v, &_capacity_until_GC);
 185 }
 186 
 187 void MetaspaceGC::initialize() {
 188   // Set the high-water mark to MaxMetapaceSize during VM initializaton since
 189   // we can't do a GC during initialization.
 190   _capacity_until_GC = MaxMetaspaceSize;
 191 }
 192 
 193 void MetaspaceGC::post_initialize() {
 194   // Reset the high-water mark once the VM initialization is done.
 195   _capacity_until_GC = MAX2(MetaspaceUtils::committed_bytes(), MetaspaceSize);
 196 }
 197 
 198 bool MetaspaceGC::can_expand(size_t word_size, bool is_class) {
 199   // Check if the compressed class space is full.
 200   if (is_class && Metaspace::using_class_space()) {
 201     size_t class_committed = MetaspaceUtils::committed_bytes(Metaspace::ClassType);
 202     if (class_committed + word_size * BytesPerWord > CompressedClassSpaceSize) {
 203       log_trace(gc, metaspace, freelist)("Cannot expand %s metaspace by " SIZE_FORMAT " words (CompressedClassSpaceSize = " SIZE_FORMAT " words)",
 204                 (is_class ? "class" : "non-class"), word_size, CompressedClassSpaceSize / sizeof(MetaWord));
 205       return false;
 206     }
 207   }
 208 
 209   // Check if the user has imposed a limit on the metaspace memory.
 210   size_t committed_bytes = MetaspaceUtils::committed_bytes();
 211   if (committed_bytes + word_size * BytesPerWord > MaxMetaspaceSize) {
 212     log_trace(gc, metaspace, freelist)("Cannot expand %s metaspace by " SIZE_FORMAT " words (MaxMetaspaceSize = " SIZE_FORMAT " words)",
 213               (is_class ? "class" : "non-class"), word_size, MaxMetaspaceSize / sizeof(MetaWord));
 214     return false;
 215   }
 216 
 217   return true;
 218 }
 219 
 220 size_t MetaspaceGC::allowed_expansion() {
 221   size_t committed_bytes = MetaspaceUtils::committed_bytes();
 222   size_t capacity_until_gc = capacity_until_GC();
 223 
 224   assert(capacity_until_gc >= committed_bytes,
 225          "capacity_until_gc: " SIZE_FORMAT " < committed_bytes: " SIZE_FORMAT,
 226          capacity_until_gc, committed_bytes);
 227 
 228   size_t left_until_max  = MaxMetaspaceSize - committed_bytes;
 229   size_t left_until_GC = capacity_until_gc - committed_bytes;
 230   size_t left_to_commit = MIN2(left_until_GC, left_until_max);
 231   log_trace(gc, metaspace, freelist)("allowed expansion words: " SIZE_FORMAT
 232             " (left_until_max: " SIZE_FORMAT ", left_until_GC: " SIZE_FORMAT ".",
 233             left_to_commit / BytesPerWord, left_until_max / BytesPerWord, left_until_GC / BytesPerWord);
 234 
 235   return left_to_commit / BytesPerWord;
 236 }
 237 
 238 void MetaspaceGC::compute_new_size() {
 239   assert(_shrink_factor <= 100, "invalid shrink factor");
 240   uint current_shrink_factor = _shrink_factor;
 241   _shrink_factor = 0;
 242 
 243   // Using committed_bytes() for used_after_gc is an overestimation, since the
 244   // chunk free lists are included in committed_bytes() and the memory in an
 245   // un-fragmented chunk free list is available for future allocations.
 246   // However, if the chunk free lists becomes fragmented, then the memory may
 247   // not be available for future allocations and the memory is therefore "in use".
 248   // Including the chunk free lists in the definition of "in use" is therefore
 249   // necessary. Not including the chunk free lists can cause capacity_until_GC to
 250   // shrink below committed_bytes() and this has caused serious bugs in the past.
 251   const size_t used_after_gc = MetaspaceUtils::committed_bytes();
 252   const size_t capacity_until_GC = MetaspaceGC::capacity_until_GC();
 253 
 254   const double minimum_free_percentage = MinMetaspaceFreeRatio / 100.0;
 255   const double maximum_used_percentage = 1.0 - minimum_free_percentage;
 256 
 257   const double min_tmp = used_after_gc / maximum_used_percentage;
 258   size_t minimum_desired_capacity =
 259     (size_t)MIN2(min_tmp, double(MaxMetaspaceSize));
 260   // Don't shrink less than the initial generation size
 261   minimum_desired_capacity = MAX2(minimum_desired_capacity,
 262                                   MetaspaceSize);
 263 
 264   log_trace(gc, metaspace)("MetaspaceGC::compute_new_size: ");
 265   log_trace(gc, metaspace)("    minimum_free_percentage: %6.2f  maximum_used_percentage: %6.2f",
 266                            minimum_free_percentage, maximum_used_percentage);
 267   log_trace(gc, metaspace)("     used_after_gc       : %6.1fKB", used_after_gc / (double) K);
 268 
 269 
 270   size_t shrink_bytes = 0;
 271   if (capacity_until_GC < minimum_desired_capacity) {
 272     // If we have less capacity below the metaspace HWM, then
 273     // increment the HWM.
 274     size_t expand_bytes = minimum_desired_capacity - capacity_until_GC;
 275     expand_bytes = align_up(expand_bytes, Metaspace::commit_alignment());
 276     // Don't expand unless it's significant
 277     if (expand_bytes >= MinMetaspaceExpansion) {
 278       size_t new_capacity_until_GC = 0;
 279       bool succeeded = MetaspaceGC::inc_capacity_until_GC(expand_bytes, &new_capacity_until_GC);
 280       assert(succeeded, "Should always succesfully increment HWM when at safepoint");
 281 
 282       Metaspace::tracer()->report_gc_threshold(capacity_until_GC,
 283                                                new_capacity_until_GC,
 284                                                MetaspaceGCThresholdUpdater::ComputeNewSize);
 285       log_trace(gc, metaspace)("    expanding:  minimum_desired_capacity: %6.1fKB  expand_bytes: %6.1fKB  MinMetaspaceExpansion: %6.1fKB  new metaspace HWM:  %6.1fKB",
 286                                minimum_desired_capacity / (double) K,
 287                                expand_bytes / (double) K,
 288                                MinMetaspaceExpansion / (double) K,
 289                                new_capacity_until_GC / (double) K);
 290     }
 291     return;
 292   }
 293 
 294   // No expansion, now see if we want to shrink
 295   // We would never want to shrink more than this
 296   assert(capacity_until_GC >= minimum_desired_capacity,
 297          SIZE_FORMAT " >= " SIZE_FORMAT,
 298          capacity_until_GC, minimum_desired_capacity);
 299   size_t max_shrink_bytes = capacity_until_GC - minimum_desired_capacity;
 300 
 301   // Should shrinking be considered?
 302   if (MaxMetaspaceFreeRatio < 100) {
 303     const double maximum_free_percentage = MaxMetaspaceFreeRatio / 100.0;
 304     const double minimum_used_percentage = 1.0 - maximum_free_percentage;
 305     const double max_tmp = used_after_gc / minimum_used_percentage;
 306     size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(MaxMetaspaceSize));
 307     maximum_desired_capacity = MAX2(maximum_desired_capacity,
 308                                     MetaspaceSize);
 309     log_trace(gc, metaspace)("    maximum_free_percentage: %6.2f  minimum_used_percentage: %6.2f",
 310                              maximum_free_percentage, minimum_used_percentage);
 311     log_trace(gc, metaspace)("    minimum_desired_capacity: %6.1fKB  maximum_desired_capacity: %6.1fKB",
 312                              minimum_desired_capacity / (double) K, maximum_desired_capacity / (double) K);
 313 
 314     assert(minimum_desired_capacity <= maximum_desired_capacity,
 315            "sanity check");
 316 
 317     if (capacity_until_GC > maximum_desired_capacity) {
 318       // Capacity too large, compute shrinking size
 319       shrink_bytes = capacity_until_GC - maximum_desired_capacity;
 320       // We don't want shrink all the way back to initSize if people call
 321       // System.gc(), because some programs do that between "phases" and then
 322       // we'd just have to grow the heap up again for the next phase.  So we
 323       // damp the shrinking: 0% on the first call, 10% on the second call, 40%
 324       // on the third call, and 100% by the fourth call.  But if we recompute
 325       // size without shrinking, it goes back to 0%.
 326       shrink_bytes = shrink_bytes / 100 * current_shrink_factor;
 327 
 328       shrink_bytes = align_down(shrink_bytes, Metaspace::commit_alignment());
 329 
 330       assert(shrink_bytes <= max_shrink_bytes,
 331              "invalid shrink size " SIZE_FORMAT " not <= " SIZE_FORMAT,
 332              shrink_bytes, max_shrink_bytes);
 333       if (current_shrink_factor == 0) {
 334         _shrink_factor = 10;
 335       } else {
 336         _shrink_factor = MIN2(current_shrink_factor * 4, (uint) 100);
 337       }
 338       log_trace(gc, metaspace)("    shrinking:  initThreshold: %.1fK  maximum_desired_capacity: %.1fK",
 339                                MetaspaceSize / (double) K, maximum_desired_capacity / (double) K);
 340       log_trace(gc, metaspace)("    shrink_bytes: %.1fK  current_shrink_factor: %d  new shrink factor: %d  MinMetaspaceExpansion: %.1fK",
 341                                shrink_bytes / (double) K, current_shrink_factor, _shrink_factor, MinMetaspaceExpansion / (double) K);
 342     }
 343   }
 344 
 345   // Don't shrink unless it's significant
 346   if (shrink_bytes >= MinMetaspaceExpansion &&
 347       ((capacity_until_GC - shrink_bytes) >= MetaspaceSize)) {
 348     size_t new_capacity_until_GC = MetaspaceGC::dec_capacity_until_GC(shrink_bytes);
 349     Metaspace::tracer()->report_gc_threshold(capacity_until_GC,
 350                                              new_capacity_until_GC,
 351                                              MetaspaceGCThresholdUpdater::ComputeNewSize);
 352   }
 353 }
 354 
 355 // MetaspaceUtils
 356 size_t MetaspaceUtils::_capacity_words [Metaspace:: MetadataTypeCount] = {0, 0};
 357 size_t MetaspaceUtils::_overhead_words [Metaspace:: MetadataTypeCount] = {0, 0};
 358 volatile size_t MetaspaceUtils::_used_words [Metaspace:: MetadataTypeCount] = {0, 0};
 359 
 360 // Collect used metaspace statistics. This involves walking the CLDG. The resulting
 361 // output will be the accumulated values for all live metaspaces.
 362 // Note: method does not do any locking.
 363 void MetaspaceUtils::collect_statistics(ClassLoaderMetaspaceStatistics* out) {
 364   out->reset();
 365   ClassLoaderDataGraphMetaspaceIterator iter;
 366    while (iter.repeat()) {
 367      ClassLoaderMetaspace* msp = iter.get_next();
 368      if (msp != NULL) {
 369        msp->add_to_statistics(out);
 370      }
 371    }
 372 }
 373 


 514                 used_bytes()/K,
 515                 capacity_bytes()/K,
 516                 committed_bytes()/K,
 517                 reserved_bytes()/K);
 518 
 519   if (Metaspace::using_class_space()) {
 520     Metaspace::MetadataType ct = Metaspace::ClassType;
 521     out->print_cr("  class space    "
 522                   "used "      SIZE_FORMAT "K, "
 523                   "capacity "  SIZE_FORMAT "K, "
 524                   "committed " SIZE_FORMAT "K, "
 525                   "reserved "  SIZE_FORMAT "K",
 526                   used_bytes(ct)/K,
 527                   capacity_bytes(ct)/K,
 528                   committed_bytes(ct)/K,
 529                   reserved_bytes(ct)/K);
 530   }
 531 }
 532 
 533 
 534 void MetaspaceUtils::print_vs(outputStream* out, size_t scale) {
 535   const size_t reserved_nonclass_words = reserved_bytes(Metaspace::NonClassType) / sizeof(MetaWord);
 536   const size_t committed_nonclass_words = committed_bytes(Metaspace::NonClassType) / sizeof(MetaWord);
 537   {
 538     if (Metaspace::using_class_space()) {
 539       out->print("  Non-class space:  ");
 540     }
 541     print_scaled_words(out, reserved_nonclass_words, scale, 7);
 542     out->print(" reserved, ");
 543     print_scaled_words_and_percentage(out, committed_nonclass_words, reserved_nonclass_words, scale, 7);
 544     out->print_cr(" committed ");
 545 
 546     if (Metaspace::using_class_space()) {
 547       const size_t reserved_class_words = reserved_bytes(Metaspace::ClassType) / sizeof(MetaWord);
 548       const size_t committed_class_words = committed_bytes(Metaspace::ClassType) / sizeof(MetaWord);
 549       out->print("      Class space:  ");
 550       print_scaled_words(out, reserved_class_words, scale, 7);
 551       out->print(" reserved, ");
 552       print_scaled_words_and_percentage(out, committed_class_words, reserved_class_words, scale, 7);
 553       out->print_cr(" committed ");
 554 
 555       const size_t reserved_words = reserved_nonclass_words + reserved_class_words;
 556       const size_t committed_words = committed_nonclass_words + committed_class_words;
 557       out->print("             Both:  ");
 558       print_scaled_words(out, reserved_words, scale, 7);
 559       out->print(" reserved, ");
 560       print_scaled_words_and_percentage(out, committed_words, reserved_words, scale, 7);
 561       out->print_cr(" committed ");
 562     }
 563   }
 564 }
 565 
 566 static void print_basic_switches(outputStream* out, size_t scale) {
 567   out->print("MaxMetaspaceSize: ");
 568   if (MaxMetaspaceSize >= (max_uintx) - (2 * os::vm_page_size())) {
 569     // aka "very big". Default is max_uintx, but due to rounding in arg parsing the real
 570     // value is smaller.
 571     out->print("unlimited");
 572   } else {
 573     print_human_readable_size(out, MaxMetaspaceSize, scale);
 574   }
 575   out->cr();
 576   if (Metaspace::using_class_space()) {
 577     out->print("CompressedClassSpaceSize: ");
 578     print_human_readable_size(out, CompressedClassSpaceSize, scale);
 579   }
 580   out->cr();
 581 }
 582 
 583 // This will print out a basic metaspace usage report but
 584 // unlike print_report() is guaranteed not to lock or to walk the CLDG.
 585 void MetaspaceUtils::print_basic_report(outputStream* out, size_t scale) {
 586 
 587   if (!Metaspace::initialized()) {
 588     out->print_cr("Metaspace not yet initialized.");
 589     return;
 590   }
 591 
 592   out->cr();
 593   out->print_cr("Usage:");
 594 
 595   if (Metaspace::using_class_space()) {
 596     out->print("  Non-class:  ");
 597   }
 598 
 599   // In its most basic form, we do not require walking the CLDG. Instead, just print the running totals from
 600   // MetaspaceUtils.
 601   const size_t cap_nc = MetaspaceUtils::capacity_words(Metaspace::NonClassType);
 602   const size_t overhead_nc = MetaspaceUtils::overhead_words(Metaspace::NonClassType);
 603   const size_t used_nc = MetaspaceUtils::used_words(Metaspace::NonClassType);
 604   const size_t free_and_waste_nc = cap_nc - overhead_nc - used_nc;
 605 
 606   print_scaled_words(out, cap_nc, scale, 5);
 607   out->print(" capacity, ");
 608   print_scaled_words_and_percentage(out, used_nc, cap_nc, scale, 5);
 609   out->print(" used, ");
 610   print_scaled_words_and_percentage(out, free_and_waste_nc, cap_nc, scale, 5);
 611   out->print(" free+waste, ");
 612   print_scaled_words_and_percentage(out, overhead_nc, cap_nc, scale, 5);
 613   out->print(" overhead. ");
 614   out->cr();
 615 
 616   if (Metaspace::using_class_space()) {
 617     const size_t cap_c = MetaspaceUtils::capacity_words(Metaspace::ClassType);
 618     const size_t overhead_c = MetaspaceUtils::overhead_words(Metaspace::ClassType);
 619     const size_t used_c = MetaspaceUtils::used_words(Metaspace::ClassType);
 620     const size_t free_and_waste_c = cap_c - overhead_c - used_c;
 621     out->print("      Class:  ");
 622     print_scaled_words(out, cap_c, scale, 5);
 623     out->print(" capacity, ");
 624     print_scaled_words_and_percentage(out, used_c, cap_c, scale, 5);
 625     out->print(" used, ");
 626     print_scaled_words_and_percentage(out, free_and_waste_c, cap_c, scale, 5);
 627     out->print(" free+waste, ");
 628     print_scaled_words_and_percentage(out, overhead_c, cap_c, scale, 5);
 629     out->print(" overhead. ");
 630     out->cr();
 631 
 632     out->print("       Both:  ");
 633     const size_t cap = cap_nc + cap_c;
 634 
 635     print_scaled_words(out, cap, scale, 5);
 636     out->print(" capacity, ");
 637     print_scaled_words_and_percentage(out, used_nc + used_c, cap, scale, 5);
 638     out->print(" used, ");
 639     print_scaled_words_and_percentage(out, free_and_waste_nc + free_and_waste_c, cap, scale, 5);
 640     out->print(" free+waste, ");
 641     print_scaled_words_and_percentage(out, overhead_nc + overhead_c, cap, scale, 5);
 642     out->print(" overhead. ");
 643     out->cr();
 644   }
 645 
 646   out->cr();
 647   out->print_cr("Virtual space:");
 648 
 649   print_vs(out, scale);
 650 
 651   out->cr();
 652   out->print_cr("Chunk freelists:");
 653 
 654   if (Metaspace::using_class_space()) {
 655     out->print("   Non-Class:  ");
 656   }
 657   print_human_readable_size(out, Metaspace::chunk_manager_metadata()->free_chunks_total_bytes(), scale);
 658   out->cr();
 659   if (Metaspace::using_class_space()) {
 660     out->print("       Class:  ");
 661     print_human_readable_size(out, Metaspace::chunk_manager_class()->free_chunks_total_bytes(), scale);
 662     out->cr();
 663     out->print("        Both:  ");
 664     print_human_readable_size(out, Metaspace::chunk_manager_class()->free_chunks_total_bytes() +
 665                               Metaspace::chunk_manager_metadata()->free_chunks_total_bytes(), scale);
 666     out->cr();
 667   }
 668 
 669   out->cr();
 670 
 671   // Print basic settings
 672   print_basic_switches(out, scale);
 673 
 674   out->cr();
 675 
 676 }
 677 
 678 void MetaspaceUtils::print_report(outputStream* out, size_t scale, int flags) {
 679 
 680   if (!Metaspace::initialized()) {
 681     out->print_cr("Metaspace not yet initialized.");
 682     return;
 683   }
 684 
 685   const bool print_loaders = (flags & rf_show_loaders) > 0;
 686   const bool print_classes = (flags & rf_show_classes) > 0;
 687   const bool print_by_chunktype = (flags & rf_break_down_by_chunktype) > 0;
 688   const bool print_by_spacetype = (flags & rf_break_down_by_spacetype) > 0;
 689 
 690   // Some report options require walking the class loader data graph.
 691   PrintCLDMetaspaceInfoClosure cl(out, scale, print_loaders, print_classes, print_by_chunktype);
 692   if (print_loaders) {
 693     out->cr();
 694     out->print_cr("Usage per loader:");
 695     out->cr();
 696   }
 697 
 698   ClassLoaderDataGraph::loaded_cld_do(&cl); // collect data and optionally print
 699 
 700   // Print totals, broken up by space type.
 701   if (print_by_spacetype) {
 702     out->cr();
 703     out->print_cr("Usage per space type:");
 704     out->cr();
 705     for (int space_type = (int)Metaspace::ZeroMetaspaceType;
 706          space_type < (int)Metaspace::MetaspaceTypeCount; space_type ++)
 707     {
 708       uintx num_loaders = cl._num_loaders_by_spacetype[space_type];
 709       uintx num_classes = cl._num_classes_by_spacetype[space_type];
 710       out->print("%s - " UINTX_FORMAT " %s",
 711         space_type_name((Metaspace::MetaspaceType)space_type),
 712         num_loaders, loaders_plural(num_loaders));
 713       if (num_classes > 0) {
 714         out->print(", ");
 715         print_number_of_classes(out, num_classes, cl._num_classes_shared_by_spacetype[space_type]);
 716         out->print(":");
 717         cl._stats_by_spacetype[space_type].print_on(out, scale, print_by_chunktype);
 718       } else {
 719         out->print(".");
 720         out->cr();
 721       }
 722       out->cr();
 723     }
 724   }
 725 
 726   // Print totals for in-use data:
 727   out->cr();
 728   {
 729     uintx num_loaders = cl._num_loaders;
 730     out->print("Total Usage - " UINTX_FORMAT " %s, ",
 731       num_loaders, loaders_plural(num_loaders));
 732     print_number_of_classes(out, cl._num_classes, cl._num_classes_shared);
 733     out->print(":");
 734     cl._stats_total.print_on(out, scale, print_by_chunktype);
 735     out->cr();
 736   }
 737 
 738   // -- Print Virtual space.
 739   out->cr();
 740   out->print_cr("Virtual space:");
 741 
 742   print_vs(out, scale);
 743 
 744   // -- Print VirtualSpaceList details.
 745   if ((flags & rf_show_vslist) > 0) {
 746     out->cr();
 747     out->print_cr("Virtual space list%s:", Metaspace::using_class_space() ? "s" : "");
 748 
 749     if (Metaspace::using_class_space()) {
 750       out->print_cr("   Non-Class:");
 751     }
 752     Metaspace::space_list()->print_on(out, scale);
 753     if (Metaspace::using_class_space()) {
 754       out->print_cr("       Class:");
 755       Metaspace::class_space_list()->print_on(out, scale);
 756     }
 757   }
 758   out->cr();
 759 
 760   // -- Print VirtualSpaceList map.
 761   if ((flags & rf_show_vsmap) > 0) {
 762     out->cr();
 763     out->print_cr("Virtual space map:");
 764 
 765     if (Metaspace::using_class_space()) {
 766       out->print_cr("   Non-Class:");
 767     }
 768     Metaspace::space_list()->print_map(out);
 769     if (Metaspace::using_class_space()) {
 770       out->print_cr("       Class:");
 771       Metaspace::class_space_list()->print_map(out);
 772     }
 773   }
 774   out->cr();
 775 
 776   // -- Print Freelists (ChunkManager) details
 777   out->cr();
 778   out->print_cr("Chunk freelist%s:", Metaspace::using_class_space() ? "s" : "");
 779 
 780   ChunkManagerStatistics non_class_cm_stat;
 781   Metaspace::chunk_manager_metadata()->collect_statistics(&non_class_cm_stat);
 782 
 783   if (Metaspace::using_class_space()) {
 784     out->print_cr("   Non-Class:");
 785   }
 786   non_class_cm_stat.print_on(out, scale);
 787 
 788   if (Metaspace::using_class_space()) {
 789     ChunkManagerStatistics class_cm_stat;
 790     Metaspace::chunk_manager_class()->collect_statistics(&class_cm_stat);
 791     out->print_cr("       Class:");
 792     class_cm_stat.print_on(out, scale);
 793   }
 794 
 795   // As a convenience, print a summary of common waste.
 796   out->cr();
 797   out->print("Waste ");
 798   // For all wastages, print percentages from total. As total use the total size of memory committed for metaspace.
 799   const size_t committed_words = committed_bytes() / BytesPerWord;
 800 
 801   out->print("(percentages refer to total committed size ");
 802   print_scaled_words(out, committed_words, scale);
 803   out->print_cr("):");
 804 
 805   // Print space committed but not yet used by any class loader
 806   const size_t unused_words_in_vs = MetaspaceUtils::free_in_vs_bytes() / BytesPerWord;
 807   out->print("              Committed unused: ");
 808   print_scaled_words_and_percentage(out, unused_words_in_vs, committed_words, scale, 6);
 809   out->cr();
 810 
 811   // Print waste for in-use chunks.
 812   UsedChunksStatistics ucs_nonclass = cl._stats_total.nonclass_sm_stats().totals();
 813   UsedChunksStatistics ucs_class = cl._stats_total.class_sm_stats().totals();
 814   UsedChunksStatistics ucs_all;
 815   ucs_all.add(ucs_nonclass);
 816   ucs_all.add(ucs_class);
 817 
 818   out->print("        Waste in chunks in use: ");
 819   print_scaled_words_and_percentage(out, ucs_all.waste(), committed_words, scale, 6);
 820   out->cr();
 821   out->print("         Free in chunks in use: ");
 822   print_scaled_words_and_percentage(out, ucs_all.free(), committed_words, scale, 6);
 823   out->cr();
 824   out->print("     Overhead in chunks in use: ");
 825   print_scaled_words_and_percentage(out, ucs_all.overhead(), committed_words, scale, 6);
 826   out->cr();
 827 
 828   // Print waste in free chunks.
 829   const size_t total_capacity_in_free_chunks =
 830       Metaspace::chunk_manager_metadata()->free_chunks_total_words() +
 831      (Metaspace::using_class_space() ? Metaspace::chunk_manager_class()->free_chunks_total_words() : 0);
 832   out->print("                In free chunks: ");
 833   print_scaled_words_and_percentage(out, total_capacity_in_free_chunks, committed_words, scale, 6);
 834   out->cr();
 835 
 836   // Print waste in deallocated blocks.
 837   const uintx free_blocks_num =
 838       cl._stats_total.nonclass_sm_stats().free_blocks_num() +
 839       cl._stats_total.class_sm_stats().free_blocks_num();
 840   const size_t free_blocks_cap_words =
 841       cl._stats_total.nonclass_sm_stats().free_blocks_cap_words() +
 842       cl._stats_total.class_sm_stats().free_blocks_cap_words();
 843   out->print("Deallocated from chunks in use: ");
 844   print_scaled_words_and_percentage(out, free_blocks_cap_words, committed_words, scale, 6);
 845   out->print(" (" UINTX_FORMAT " blocks)", free_blocks_num);
 846   out->cr();
 847 
 848   // Print total waste.
 849   const size_t total_waste = ucs_all.waste() + ucs_all.free() + ucs_all.overhead() + total_capacity_in_free_chunks
 850       + free_blocks_cap_words + unused_words_in_vs;
 851   out->print("                       -total-: ");
 852   print_scaled_words_and_percentage(out, total_waste, committed_words, scale, 6);
 853   out->cr();
 854 
 855   // Print internal statistics
 856 #ifdef ASSERT
 857   out->cr();
 858   out->cr();
 859   out->print_cr("Internal statistics:");
 860   out->cr();
 861   out->print_cr("Number of allocations: " UINTX_FORMAT ".", g_internal_statistics.num_allocs);
 862   out->print_cr("Number of space births: " UINTX_FORMAT ".", g_internal_statistics.num_metaspace_births);
 863   out->print_cr("Number of space deaths: " UINTX_FORMAT ".", g_internal_statistics.num_metaspace_deaths);
 864   out->print_cr("Number of virtual space node births: " UINTX_FORMAT ".", g_internal_statistics.num_vsnodes_created);
 865   out->print_cr("Number of virtual space node deaths: " UINTX_FORMAT ".", g_internal_statistics.num_vsnodes_purged);
 866   out->print_cr("Number of times virtual space nodes were expanded: " UINTX_FORMAT ".", g_internal_statistics.num_committed_space_expanded);
 867   out->print_cr("Number of deallocations: " UINTX_FORMAT " (" UINTX_FORMAT " external).", g_internal_statistics.num_deallocs, g_internal_statistics.num_external_deallocs);
 868   out->print_cr("Allocations from deallocated blocks: " UINTX_FORMAT ".", g_internal_statistics.num_allocs_from_deallocated_blocks);
 869   out->print_cr("Number of chunks added to freelist: " UINTX_FORMAT ".",
 870                 g_internal_statistics.num_chunks_added_to_freelist);
 871   out->print_cr("Number of chunks removed from freelist: " UINTX_FORMAT ".",
 872                 g_internal_statistics.num_chunks_removed_from_freelist);
 873   out->print_cr("Number of chunk merges: " UINTX_FORMAT ", split-ups: " UINTX_FORMAT ".",
 874                 g_internal_statistics.num_chunk_merges, g_internal_statistics.num_chunk_splits);
 875 
 876   out->cr();
 877 #endif
 878 
 879   // Print some interesting settings
 880   out->cr();
 881   out->cr();
 882   print_basic_switches(out, scale);
 883 
 884   out->cr();
 885   out->print("InitialBootClassLoaderMetaspaceSize: ");
 886   print_human_readable_size(out, InitialBootClassLoaderMetaspaceSize, scale);
 887 
 888   out->cr();
 889   out->cr();
 890 
 891 } // MetaspaceUtils::print_report()
 892 
 893 // Prints an ASCII representation of the given space.
 894 void MetaspaceUtils::print_metaspace_map(outputStream* out, Metaspace::MetadataType mdtype) {
 895   MutexLocker cl(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag);
 896   const bool for_class = mdtype == Metaspace::ClassType ? true : false;
 897   VirtualSpaceList* const vsl = for_class ? Metaspace::class_space_list() : Metaspace::space_list();
 898   if (vsl != NULL) {
 899     if (for_class) {
 900       if (!Metaspace::using_class_space()) {
 901         out->print_cr("No Class Space.");
 902         return;
 903       }
 904       out->print_raw("---- Metaspace Map (Class Space) ----");
 905     } else {
 906       out->print_raw("---- Metaspace Map (Non-Class Space) ----");
 907     }
 908     // Print legend:
 909     out->cr();
 910     out->print_cr("Chunk Types (uppercase chunks are in use): x-specialized, s-small, m-medium, h-humongous.");
 911     out->cr();


 940     Metaspace::MetadataType mdtype = (Metaspace::MetadataType)i;
 941     UsedChunksStatistics chunk_stat = total_stat.sm_stats(mdtype).totals();
 942     if (capacity_words(mdtype) != chunk_stat.cap() ||
 943         used_words(mdtype) != chunk_stat.used() ||
 944         overhead_words(mdtype) != chunk_stat.overhead()) {
 945       mismatch = true;
 946       tty->print_cr("MetaspaceUtils::verify_metrics: counter mismatch for mdtype=%u:", mdtype);
 947       tty->print_cr("Expected cap " SIZE_FORMAT ", used " SIZE_FORMAT ", overhead " SIZE_FORMAT ".",
 948                     capacity_words(mdtype), used_words(mdtype), overhead_words(mdtype));
 949       tty->print_cr("Got cap " SIZE_FORMAT ", used " SIZE_FORMAT ", overhead " SIZE_FORMAT ".",
 950                     chunk_stat.cap(), chunk_stat.used(), chunk_stat.overhead());
 951       tty->flush();
 952     }
 953   }
 954   assert(mismatch == false, "MetaspaceUtils::verify_metrics: counter mismatch.");
 955 #endif
 956 }
 957 
 958 // Metaspace methods
 959 
 960 size_t Metaspace::_first_chunk_word_size = 0;
 961 size_t Metaspace::_first_class_chunk_word_size = 0;
 962 
 963 size_t Metaspace::_commit_alignment = 0;
 964 size_t Metaspace::_reserve_alignment = 0;
 965 
 966 VirtualSpaceList* Metaspace::_space_list = NULL;
 967 VirtualSpaceList* Metaspace::_class_space_list = NULL;
 968 
 969 ChunkManager* Metaspace::_chunk_manager_metadata = NULL;
 970 ChunkManager* Metaspace::_chunk_manager_class = NULL;
 971 
 972 bool Metaspace::_initialized = false;
 973 
 974 #define VIRTUALSPACEMULTIPLIER 2
 975 
 976 #ifdef _LP64
 977 static const uint64_t UnscaledClassSpaceMax = (uint64_t(max_juint) + 1);
 978 
 979 void Metaspace::set_narrow_klass_base_and_shift(address metaspace_base, address cds_base) {
 980   assert(!DumpSharedSpaces, "narrow_klass is set by MetaspaceShared class.");
 981   // Figure out the narrow_klass_base and the narrow_klass_shift.  The
 982   // narrow_klass_base is the lower of the metaspace base and the cds base
 983   // (if cds is enabled).  The narrow_klass_shift depends on the distance
 984   // between the lower base and higher address.
 985   address lower_base;


1161   st->print_cr("Narrow klass base: " PTR_FORMAT ", Narrow klass shift: %d",
1162                p2i(CompressedKlassPointers::base()), CompressedKlassPointers::shift());
1163   if (_class_space_list != NULL) {
1164     address base = (address)_class_space_list->current_virtual_space()->bottom();
1165     st->print("Compressed class space size: " SIZE_FORMAT " Address: " PTR_FORMAT,
1166                  compressed_class_space_size(), p2i(base));
1167     if (requested_addr != 0) {
1168       st->print(" Req Addr: " PTR_FORMAT, p2i(requested_addr));
1169     }
1170     st->cr();
1171   }
1172 }
1173 
1174 // For UseCompressedClassPointers the class space is reserved above the top of
1175 // the Java heap.  The argument passed in is at the base of the compressed space.
1176 void Metaspace::initialize_class_space(ReservedSpace rs) {
1177   // The reserved space size may be bigger because of alignment, esp with UseLargePages
1178   assert(rs.size() >= CompressedClassSpaceSize,
1179          SIZE_FORMAT " != " SIZE_FORMAT, rs.size(), CompressedClassSpaceSize);
1180   assert(using_class_space(), "Must be using class space");
1181   _class_space_list = new VirtualSpaceList(rs);
1182   _chunk_manager_class = new ChunkManager(true/*is_class*/);
1183 
1184   if (!_class_space_list->initialization_succeeded()) {
1185     vm_exit_during_initialization("Failed to setup compressed class space virtual space list.");
1186   }
1187 }
1188 
1189 #endif
1190 
1191 void Metaspace::ergo_initialize() {
1192   if (DumpSharedSpaces) {
1193     // Using large pages when dumping the shared archive is currently not implemented.
1194     FLAG_SET_ERGO(UseLargePagesInMetaspace, false);
1195   }
1196 
1197   size_t page_size = os::vm_page_size();
1198   if (UseLargePages && UseLargePagesInMetaspace) {
1199     page_size = os::large_page_size();
1200   }
1201 
1202   _commit_alignment  = page_size;
1203   _reserve_alignment = MAX2(page_size, (size_t)os::vm_allocation_granularity());





1204 
1205   // Do not use FLAG_SET_ERGO to update MaxMetaspaceSize, since this will
1206   // override if MaxMetaspaceSize was set on the command line or not.
1207   // This information is needed later to conform to the specification of the
1208   // java.lang.management.MemoryUsage API.
1209   //
1210   // Ideally, we would be able to set the default value of MaxMetaspaceSize in
1211   // globals.hpp to the aligned value, but this is not possible, since the
1212   // alignment depends on other flags being parsed.
1213   MaxMetaspaceSize = align_down_bounded(MaxMetaspaceSize, _reserve_alignment);
1214 
1215   if (MetaspaceSize > MaxMetaspaceSize) {
1216     MetaspaceSize = MaxMetaspaceSize;
1217   }
1218 
1219   MetaspaceSize = align_down_bounded(MetaspaceSize, _commit_alignment);
1220 
1221   assert(MetaspaceSize <= MaxMetaspaceSize, "MetaspaceSize should be limited by MaxMetaspaceSize");
1222 
1223   MinMetaspaceExpansion = align_down_bounded(MinMetaspaceExpansion, _commit_alignment);


1229   size_t min_metaspace_sz =
1230       VIRTUALSPACEMULTIPLIER * InitialBootClassLoaderMetaspaceSize;
1231   if (UseCompressedClassPointers) {
1232     if ((min_metaspace_sz + CompressedClassSpaceSize) >  MaxMetaspaceSize) {
1233       if (min_metaspace_sz >= MaxMetaspaceSize) {
1234         vm_exit_during_initialization("MaxMetaspaceSize is too small.");
1235       } else {
1236         FLAG_SET_ERGO(CompressedClassSpaceSize,
1237                       MaxMetaspaceSize - min_metaspace_sz);
1238       }
1239     }
1240   } else if (min_metaspace_sz >= MaxMetaspaceSize) {
1241     FLAG_SET_ERGO(InitialBootClassLoaderMetaspaceSize,
1242                   min_metaspace_sz);
1243   }
1244 
1245   set_compressed_class_space_size(CompressedClassSpaceSize);
1246 }
1247 
1248 void Metaspace::global_initialize() {
1249   MetaspaceGC::initialize();
1250 
1251 #if INCLUDE_CDS
1252   if (DumpSharedSpaces) {
1253     MetaspaceShared::initialize_dumptime_shared_and_meta_spaces();
1254   } else if (UseSharedSpaces) {
1255     // If any of the archived space fails to map, UseSharedSpaces
1256     // is reset to false. Fall through to the
1257     // (!DumpSharedSpaces && !UseSharedSpaces) case to set up class
1258     // metaspace.
1259     MetaspaceShared::initialize_runtime_shared_and_meta_spaces();
1260   }
1261 
1262   if (DynamicDumpSharedSpaces && !UseSharedSpaces) {
1263     vm_exit_during_initialization("DynamicDumpSharedSpaces is unsupported when base CDS archive is not loaded", NULL);
1264   }
1265 
1266   if (!DumpSharedSpaces && !UseSharedSpaces)
1267 #endif // INCLUDE_CDS
1268   {


1269 #ifdef _LP64
1270     if (using_class_space()) {
1271       char* base = (char*)align_up(Universe::heap()->reserved_region().end(), _reserve_alignment);
1272       allocate_metaspace_compressed_klass_ptrs(base, 0);
1273     }
1274 #endif // _LP64
1275   }
1276 
1277   // Initialize these before initializing the VirtualSpaceList
1278   _first_chunk_word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord;
1279   _first_chunk_word_size = align_word_size_up(_first_chunk_word_size);
1280   // Make the first class chunk bigger than a medium chunk so it's not put
1281   // on the medium chunk list.   The next chunk will be small and progress
1282   // from there.  This size calculated by -version.
1283   _first_class_chunk_word_size = MIN2((size_t)MediumChunk*6,
1284                                      (CompressedClassSpaceSize/BytesPerWord)*2);
1285   _first_class_chunk_word_size = align_word_size_up(_first_class_chunk_word_size);
1286   // Arbitrarily set the initial virtual space to a multiple
1287   // of the boot class loader size.
1288   size_t word_size = VIRTUALSPACEMULTIPLIER * _first_chunk_word_size;
1289   word_size = align_up(word_size, Metaspace::reserve_alignment_words());
1290 
1291   // Initialize the list of virtual spaces.
1292   _space_list = new VirtualSpaceList(word_size);
1293   _chunk_manager_metadata = new ChunkManager(false/*metaspace*/);
1294 
1295   if (!_space_list->initialization_succeeded()) {
1296     vm_exit_during_initialization("Unable to setup metadata virtual space list.", NULL);
1297   }
1298 
1299   _tracer = new MetaspaceTracer();
1300 
1301   _initialized = true;
1302 
1303 }
1304 
1305 void Metaspace::post_initialize() {
1306   MetaspaceGC::post_initialize();
1307 }
1308 
1309 void Metaspace::verify_global_initialization() {
1310   assert(space_list() != NULL, "Metadata VirtualSpaceList has not been initialized");
1311   assert(chunk_manager_metadata() != NULL, "Metadata ChunkManager has not been initialized");
1312 
1313   if (using_class_space()) {
1314     assert(class_space_list() != NULL, "Class VirtualSpaceList has not been initialized");
1315     assert(chunk_manager_class() != NULL, "Class ChunkManager has not been initialized");
1316   }
1317 }
1318 
1319 size_t Metaspace::align_word_size_up(size_t word_size) {
1320   size_t byte_size = word_size * wordSize;
1321   return ReservedSpace::allocation_align_size_up(byte_size) / wordSize;
1322 }
1323 
1324 MetaWord* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size,
1325                               MetaspaceObj::Type type, TRAPS) {
1326   assert(!_frozen, "sanity");
1327   assert(!(DumpSharedSpaces && THREAD->is_VM_thread()), "sanity");
1328 
1329   if (HAS_PENDING_EXCEPTION) {
1330     assert(false, "Should not allocate with exception pending");
1331     return NULL;  // caller does a CHECK_NULL too
1332   }
1333 
1334   assert(loader_data != NULL, "Should never pass around a NULL loader_data. "
1335         "ClassLoaderData::the_null_class_loader_data() should have been used.");
1336 
1337   MetadataType mdtype = (type == MetaspaceObj::ClassType) ? ClassType : NonClassType;
1338 
1339   // Try to allocate metadata.
1340   MetaWord* result = loader_data->metaspace_non_null()->allocate(word_size, mdtype);
1341 
1342   if (result == NULL) {


1441                  Mutex::_no_safepoint_check_flag);
1442   purge(NonClassType);
1443   if (using_class_space()) {
1444     purge(ClassType);
1445   }
1446 }
1447 
1448 bool Metaspace::contains(const void* ptr) {
1449   if (MetaspaceShared::is_in_shared_metaspace(ptr)) {
1450     return true;
1451   }
1452   return contains_non_shared(ptr);
1453 }
1454 
1455 bool Metaspace::contains_non_shared(const void* ptr) {
1456   if (using_class_space() && get_space_list(ClassType)->contains(ptr)) {
1457      return true;
1458   }
1459 
1460   return get_space_list(NonClassType)->contains(ptr);
1461 }
1462 
1463 // ClassLoaderMetaspace
1464 
1465 ClassLoaderMetaspace::ClassLoaderMetaspace(Mutex* lock, Metaspace::MetaspaceType type)
1466   : _space_type(type)
1467   , _lock(lock)
1468   , _vsm(NULL)
1469   , _class_vsm(NULL)
1470 {
1471   initialize(lock, type);
1472 }
1473 
1474 ClassLoaderMetaspace::~ClassLoaderMetaspace() {
1475   Metaspace::assert_not_frozen();
1476   DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_metaspace_deaths));
1477   delete _vsm;
1478   if (Metaspace::using_class_space()) {
1479     delete _class_vsm;
1480   }
1481 }
1482 
1483 void ClassLoaderMetaspace::initialize_first_chunk(Metaspace::MetaspaceType type, Metaspace::MetadataType mdtype) {
1484   Metachunk* chunk = get_initialization_chunk(type, mdtype);
1485   if (chunk != NULL) {
1486     // Add to this manager's list of chunks in use and make it the current_chunk().
1487     get_space_manager(mdtype)->add_chunk(chunk, true);
1488   }
1489 }
1490 
1491 Metachunk* ClassLoaderMetaspace::get_initialization_chunk(Metaspace::MetaspaceType type, Metaspace::MetadataType mdtype) {
1492   size_t chunk_word_size = get_space_manager(mdtype)->get_initial_chunk_size(type);
1493 
1494   // Get a chunk from the chunk freelist
1495   Metachunk* chunk = Metaspace::get_chunk_manager(mdtype)->chunk_freelist_allocate(chunk_word_size);
1496 
1497   if (chunk == NULL) {
1498     chunk = Metaspace::get_space_list(mdtype)->get_new_chunk(chunk_word_size,
1499                                                   get_space_manager(mdtype)->medium_chunk_bunch());
1500   }
1501 
1502   return chunk;
1503 }
1504 
1505 void ClassLoaderMetaspace::initialize(Mutex* lock, Metaspace::MetaspaceType type) {
1506   Metaspace::verify_global_initialization();
1507 
1508   DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_metaspace_births));
1509 
1510   // Allocate SpaceManager for metadata objects.
1511   _vsm = new SpaceManager(Metaspace::NonClassType, type, lock);
1512 
1513   if (Metaspace::using_class_space()) {
1514     // Allocate SpaceManager for classes.
1515     _class_vsm = new SpaceManager(Metaspace::ClassType, type, lock);
1516   }
1517 
1518   MutexLocker cl(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag);
1519 
1520   // Allocate chunk for metadata objects
1521   initialize_first_chunk(type, Metaspace::NonClassType);
1522 
1523   // Allocate chunk for class metadata objects
1524   if (Metaspace::using_class_space()) {
1525     initialize_first_chunk(type, Metaspace::ClassType);
1526   }
1527 }
1528 
1529 MetaWord* ClassLoaderMetaspace::allocate(size_t word_size, Metaspace::MetadataType mdtype) {
1530   Metaspace::assert_not_frozen();
1531 
1532   DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_allocs));
1533 
1534   // Don't use class_vsm() unless UseCompressedClassPointers is true.
1535   if (Metaspace::is_class_space_allocation(mdtype)) {
1536     return  class_vsm()->allocate(word_size);
1537   } else {
1538     return  vsm()->allocate(word_size);
1539   }
1540 }
1541 
1542 MetaWord* ClassLoaderMetaspace::expand_and_allocate(size_t word_size, Metaspace::MetadataType mdtype) {
1543   Metaspace::assert_not_frozen();
1544   size_t delta_bytes = MetaspaceGC::delta_capacity_until_GC(word_size * BytesPerWord);
1545   assert(delta_bytes > 0, "Must be");
1546 
1547   size_t before = 0;
1548   size_t after = 0;
1549   bool can_retry = true;
1550   MetaWord* res;
1551   bool incremented;
1552 
1553   // Each thread increments the HWM at most once. Even if the thread fails to increment
1554   // the HWM, an allocation is still attempted. This is because another thread must then
1555   // have incremented the HWM and therefore the allocation might still succeed.
1556   do {
1557     incremented = MetaspaceGC::inc_capacity_until_GC(delta_bytes, &after, &before, &can_retry);
1558     res = allocate(word_size, mdtype);
1559   } while (!incremented && res == NULL && can_retry);
1560 
1561   if (incremented) {
1562     Metaspace::tracer()->report_gc_threshold(before, after,
1563                                   MetaspaceGCThresholdUpdater::ExpandAndAllocate);
1564     log_trace(gc, metaspace)("Increase capacity to GC from " SIZE_FORMAT " to " SIZE_FORMAT, before, after);
1565   }
1566 
1567   return res;
1568 }
1569 
1570 size_t ClassLoaderMetaspace::allocated_blocks_bytes() const {
1571   return (vsm()->used_words() +
1572       (Metaspace::using_class_space() ? class_vsm()->used_words() : 0)) * BytesPerWord;
1573 }
1574 
1575 size_t ClassLoaderMetaspace::allocated_chunks_bytes() const {
1576   return (vsm()->capacity_words() +
1577       (Metaspace::using_class_space() ? class_vsm()->capacity_words() : 0)) * BytesPerWord;
1578 }
1579 
1580 void ClassLoaderMetaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) {
1581   Metaspace::assert_not_frozen();
1582   assert(!SafepointSynchronize::is_at_safepoint()
1583          || Thread::current()->is_VM_thread(), "should be the VM thread");
1584 
1585   DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_external_deallocs));
1586 
1587   MutexLocker ml(vsm()->lock(), Mutex::_no_safepoint_check_flag);
1588 
1589   if (is_class && Metaspace::using_class_space()) {
1590     class_vsm()->deallocate(ptr, word_size);
1591   } else {
1592     vsm()->deallocate(ptr, word_size);
1593   }
1594 }
1595 
1596 size_t ClassLoaderMetaspace::class_chunk_size(size_t word_size) {
1597   assert(Metaspace::using_class_space(), "Has to use class space");
1598   return class_vsm()->calc_chunk_size(word_size);
1599 }
1600 
1601 void ClassLoaderMetaspace::print_on(outputStream* out) const {
1602   // Print both class virtual space counts and metaspace.
1603   if (Verbose) {
1604     vsm()->print_on(out);
1605     if (Metaspace::using_class_space()) {
1606       class_vsm()->print_on(out);
1607     }
1608   }
1609 }
1610 
1611 void ClassLoaderMetaspace::verify() {
1612   vsm()->verify();
1613   if (Metaspace::using_class_space()) {
1614     class_vsm()->verify();
1615   }
1616 }
1617 
1618 void ClassLoaderMetaspace::add_to_statistics_locked(ClassLoaderMetaspaceStatistics* out) const {
1619   assert_lock_strong(lock());
1620   vsm()->add_to_statistics_locked(&out->nonclass_sm_stats());
1621   if (Metaspace::using_class_space()) {
1622     class_vsm()->add_to_statistics_locked(&out->class_sm_stats());
1623   }
1624 }
1625 
1626 void ClassLoaderMetaspace::add_to_statistics(ClassLoaderMetaspaceStatistics* out) const {
1627   MutexLocker cl(lock(), Mutex::_no_safepoint_check_flag);
1628   add_to_statistics_locked(out);
1629 }
1630 
1631 /////////////// Unit tests ///////////////
1632 
1633 struct chunkmanager_statistics_t {
1634   int num_specialized_chunks;
1635   int num_small_chunks;
1636   int num_medium_chunks;
1637   int num_humongous_chunks;
1638 };
1639 
1640 extern void test_metaspace_retrieve_chunkmanager_statistics(Metaspace::MetadataType mdType, chunkmanager_statistics_t* out) {
1641   ChunkManager* const chunk_manager = Metaspace::get_chunk_manager(mdType);
1642   ChunkManagerStatistics stat;
1643   chunk_manager->collect_statistics(&stat);
1644   out->num_specialized_chunks = (int)stat.chunk_stats(SpecializedIndex).num();
1645   out->num_small_chunks = (int)stat.chunk_stats(SmallIndex).num();
1646   out->num_medium_chunks = (int)stat.chunk_stats(MediumIndex).num();
1647   out->num_humongous_chunks = (int)stat.chunk_stats(HumongousIndex).num();
1648 }


  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 "aot/aotLoader.hpp"
  27 #include "classfile/classLoaderDataGraph.hpp"
  28 #include "gc/shared/collectedHeap.hpp"
  29 #include "logging/log.hpp"
  30 #include "logging/logStream.hpp"
  31 #include "memory/filemap.hpp"
  32 #include "memory/metaspace.hpp"
  33 #include "memory/metaspace/chunkManager.hpp"
  34 #include "memory/metaspace/chunkLevel.hpp"
  35 #include "memory/metaspace/metachunk.hpp"

  36 #include "memory/metaspace/printCLDMetaspaceInfoClosure.hpp"
  37 #include "memory/metaspace/spaceManager.hpp"
  38 #include "memory/metaspace/virtualSpaceList.hpp"
  39 #include "memory/metaspaceShared.hpp"
  40 #include "memory/metaspaceTracer.hpp"
  41 #include "memory/universe.hpp"
  42 #include "oops/compressedOops.hpp"
  43 #include "runtime/init.hpp"
  44 #include "runtime/orderAccess.hpp"
  45 #include "services/memTracker.hpp"
  46 #include "utilities/copy.hpp"
  47 #include "utilities/debug.hpp"
  48 #include "utilities/formatBuffer.hpp"
  49 #include "utilities/globalDefinitions.hpp"
  50 #include "utilities/vmError.hpp"
  51 
  52 
  53 using namespace metaspace;
  54 
  55 MetaWord* last_allocated = 0;
  56 
  57 size_t Metaspace::_compressed_class_space_size;
  58 const MetaspaceTracer* Metaspace::_tracer = NULL;
  59 
  60 DEBUG_ONLY(bool Metaspace::_frozen = false;)
  61 













































































































  62 








  63 













































































































































































  64 
  65 // MetaspaceUtils
  66 size_t MetaspaceUtils::_capacity_words [Metaspace:: MetadataTypeCount] = {0, 0};
  67 size_t MetaspaceUtils::_overhead_words [Metaspace:: MetadataTypeCount] = {0, 0};
  68 volatile size_t MetaspaceUtils::_used_words [Metaspace:: MetadataTypeCount] = {0, 0};
  69 
  70 // Collect used metaspace statistics. This involves walking the CLDG. The resulting
  71 // output will be the accumulated values for all live metaspaces.
  72 // Note: method does not do any locking.
  73 void MetaspaceUtils::collect_statistics(ClassLoaderMetaspaceStatistics* out) {
  74   out->reset();
  75   ClassLoaderDataGraphMetaspaceIterator iter;
  76    while (iter.repeat()) {
  77      ClassLoaderMetaspace* msp = iter.get_next();
  78      if (msp != NULL) {
  79        msp->add_to_statistics(out);
  80      }
  81    }
  82 }
  83 


 224                 used_bytes()/K,
 225                 capacity_bytes()/K,
 226                 committed_bytes()/K,
 227                 reserved_bytes()/K);
 228 
 229   if (Metaspace::using_class_space()) {
 230     Metaspace::MetadataType ct = Metaspace::ClassType;
 231     out->print_cr("  class space    "
 232                   "used "      SIZE_FORMAT "K, "
 233                   "capacity "  SIZE_FORMAT "K, "
 234                   "committed " SIZE_FORMAT "K, "
 235                   "reserved "  SIZE_FORMAT "K",
 236                   used_bytes(ct)/K,
 237                   capacity_bytes(ct)/K,
 238                   committed_bytes(ct)/K,
 239                   reserved_bytes(ct)/K);
 240   }
 241 }
 242 
 243 






































































































































































































































































































































































 244 
 245 // Prints an ASCII representation of the given space.
 246 void MetaspaceUtils::print_metaspace_map(outputStream* out, Metaspace::MetadataType mdtype) {
 247   MutexLocker cl(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag);
 248   const bool for_class = mdtype == Metaspace::ClassType ? true : false;
 249   VirtualSpaceList* const vsl = for_class ? Metaspace::class_space_list() : Metaspace::space_list();
 250   if (vsl != NULL) {
 251     if (for_class) {
 252       if (!Metaspace::using_class_space()) {
 253         out->print_cr("No Class Space.");
 254         return;
 255       }
 256       out->print_raw("---- Metaspace Map (Class Space) ----");
 257     } else {
 258       out->print_raw("---- Metaspace Map (Non-Class Space) ----");
 259     }
 260     // Print legend:
 261     out->cr();
 262     out->print_cr("Chunk Types (uppercase chunks are in use): x-specialized, s-small, m-medium, h-humongous.");
 263     out->cr();


 292     Metaspace::MetadataType mdtype = (Metaspace::MetadataType)i;
 293     UsedChunksStatistics chunk_stat = total_stat.sm_stats(mdtype).totals();
 294     if (capacity_words(mdtype) != chunk_stat.cap() ||
 295         used_words(mdtype) != chunk_stat.used() ||
 296         overhead_words(mdtype) != chunk_stat.overhead()) {
 297       mismatch = true;
 298       tty->print_cr("MetaspaceUtils::verify_metrics: counter mismatch for mdtype=%u:", mdtype);
 299       tty->print_cr("Expected cap " SIZE_FORMAT ", used " SIZE_FORMAT ", overhead " SIZE_FORMAT ".",
 300                     capacity_words(mdtype), used_words(mdtype), overhead_words(mdtype));
 301       tty->print_cr("Got cap " SIZE_FORMAT ", used " SIZE_FORMAT ", overhead " SIZE_FORMAT ".",
 302                     chunk_stat.cap(), chunk_stat.used(), chunk_stat.overhead());
 303       tty->flush();
 304     }
 305   }
 306   assert(mismatch == false, "MetaspaceUtils::verify_metrics: counter mismatch.");
 307 #endif
 308 }
 309 
 310 // Metaspace methods
 311 






 312 VirtualSpaceList* Metaspace::_space_list = NULL;
 313 VirtualSpaceList* Metaspace::_class_space_list = NULL;
 314 
 315 ChunkManager* Metaspace::_chunk_manager_metadata = NULL;
 316 ChunkManager* Metaspace::_chunk_manager_class = NULL;
 317 
 318 bool Metaspace::_initialized = false;
 319 
 320 #define VIRTUALSPACEMULTIPLIER 2
 321 
 322 #ifdef _LP64
 323 static const uint64_t UnscaledClassSpaceMax = (uint64_t(max_juint) + 1);
 324 
 325 void Metaspace::set_narrow_klass_base_and_shift(address metaspace_base, address cds_base) {
 326   assert(!DumpSharedSpaces, "narrow_klass is set by MetaspaceShared class.");
 327   // Figure out the narrow_klass_base and the narrow_klass_shift.  The
 328   // narrow_klass_base is the lower of the metaspace base and the cds base
 329   // (if cds is enabled).  The narrow_klass_shift depends on the distance
 330   // between the lower base and higher address.
 331   address lower_base;


 507   st->print_cr("Narrow klass base: " PTR_FORMAT ", Narrow klass shift: %d",
 508                p2i(CompressedKlassPointers::base()), CompressedKlassPointers::shift());
 509   if (_class_space_list != NULL) {
 510     address base = (address)_class_space_list->current_virtual_space()->bottom();
 511     st->print("Compressed class space size: " SIZE_FORMAT " Address: " PTR_FORMAT,
 512                  compressed_class_space_size(), p2i(base));
 513     if (requested_addr != 0) {
 514       st->print(" Req Addr: " PTR_FORMAT, p2i(requested_addr));
 515     }
 516     st->cr();
 517   }
 518 }
 519 
 520 // For UseCompressedClassPointers the class space is reserved above the top of
 521 // the Java heap.  The argument passed in is at the base of the compressed space.
 522 void Metaspace::initialize_class_space(ReservedSpace rs) {
 523   // The reserved space size may be bigger because of alignment, esp with UseLargePages
 524   assert(rs.size() >= CompressedClassSpaceSize,
 525          SIZE_FORMAT " != " SIZE_FORMAT, rs.size(), CompressedClassSpaceSize);
 526   assert(using_class_space(), "Must be using class space");
 527   _class_space_list = new VirtualSpaceList("class space list", rs);
 528   _chunk_manager_class = new ChunkManager("class space chunk manager", _class_space_list);
 529 



 530 }
 531 
 532 #endif
 533 
 534 void Metaspace::ergo_initialize() {
 535   if (DumpSharedSpaces) {
 536     // Using large pages when dumping the shared archive is currently not implemented.
 537     FLAG_SET_ERGO(UseLargePagesInMetaspace, false);
 538   }
 539 
 540   size_t page_size = os::vm_page_size();
 541   if (UseLargePages && UseLargePagesInMetaspace) {
 542     page_size = os::large_page_size();
 543   }
 544 
 545   _commit_alignment  = page_size;
 546 
 547   // Reserve alignment: all Metaspace memory mappings are to be aligned to the size of a root chunk.
 548   assert(is_aligned_to((int)MAX_CHUNK_BYTE_SIZE, os::vm_allocation_granularity()),
 549       "root chunk size must be a multiple of alloc granularity");
 550 
 551   _reserve_alignment = MAX2(page_size, (size_t)MAX_CHUNK_BYTE_SIZE);
 552 
 553   // Do not use FLAG_SET_ERGO to update MaxMetaspaceSize, since this will
 554   // override if MaxMetaspaceSize was set on the command line or not.
 555   // This information is needed later to conform to the specification of the
 556   // java.lang.management.MemoryUsage API.
 557   //
 558   // Ideally, we would be able to set the default value of MaxMetaspaceSize in
 559   // globals.hpp to the aligned value, but this is not possible, since the
 560   // alignment depends on other flags being parsed.
 561   MaxMetaspaceSize = align_down_bounded(MaxMetaspaceSize, _reserve_alignment);
 562 
 563   if (MetaspaceSize > MaxMetaspaceSize) {
 564     MetaspaceSize = MaxMetaspaceSize;
 565   }
 566 
 567   MetaspaceSize = align_down_bounded(MetaspaceSize, _commit_alignment);
 568 
 569   assert(MetaspaceSize <= MaxMetaspaceSize, "MetaspaceSize should be limited by MaxMetaspaceSize");
 570 
 571   MinMetaspaceExpansion = align_down_bounded(MinMetaspaceExpansion, _commit_alignment);


 577   size_t min_metaspace_sz =
 578       VIRTUALSPACEMULTIPLIER * InitialBootClassLoaderMetaspaceSize;
 579   if (UseCompressedClassPointers) {
 580     if ((min_metaspace_sz + CompressedClassSpaceSize) >  MaxMetaspaceSize) {
 581       if (min_metaspace_sz >= MaxMetaspaceSize) {
 582         vm_exit_during_initialization("MaxMetaspaceSize is too small.");
 583       } else {
 584         FLAG_SET_ERGO(CompressedClassSpaceSize,
 585                       MaxMetaspaceSize - min_metaspace_sz);
 586       }
 587     }
 588   } else if (min_metaspace_sz >= MaxMetaspaceSize) {
 589     FLAG_SET_ERGO(InitialBootClassLoaderMetaspaceSize,
 590                   min_metaspace_sz);
 591   }
 592 
 593   set_compressed_class_space_size(CompressedClassSpaceSize);
 594 }
 595 
 596 void Metaspace::global_initialize() {
 597   MetaspaceGC::initialize(); // <- since we do not prealloc init chunks anymore is this still needed?
 598 
 599 #if INCLUDE_CDS
 600   if (DumpSharedSpaces) {
 601     MetaspaceShared::initialize_dumptime_shared_and_meta_spaces();
 602   } else if (UseSharedSpaces) {
 603     // If any of the archived space fails to map, UseSharedSpaces
 604     // is reset to false. Fall through to the
 605     // (!DumpSharedSpaces && !UseSharedSpaces) case to set up class
 606     // metaspace.
 607     MetaspaceShared::initialize_runtime_shared_and_meta_spaces();
 608   }
 609 
 610   if (DynamicDumpSharedSpaces && !UseSharedSpaces) {
 611     vm_exit_during_initialization("DynamicDumpSharedSpaces is unsupported when base CDS archive is not loaded", NULL);
 612   }


 613 #endif // INCLUDE_CDS
 614 
 615   // Initialize class space:
 616   if (CDS_ONLY(!DumpSharedSpaces && !UseSharedSpaces) NOT_CDS(true)) {
 617 #ifdef _LP64
 618     if (using_class_space()) {
 619       char* base = (char*)align_up(Universe::heap()->reserved_region().end(), _reserve_alignment);
 620       allocate_metaspace_compressed_klass_ptrs(base, 0);
 621     }
 622 #endif // _LP64
 623   }
 624 
 625   // Initialize non-class virtual space list, and its chunk manager:
 626   _space_list = new VirtualSpaceList("Non-Class VirtualSpaceList");
 627   _chunk_manager_metadata = new ChunkManager("Non-Class ChunkManager", _space_list);


















 628 
 629   _tracer = new MetaspaceTracer();
 630 
 631   _initialized = true;
 632 
 633 }
 634 
 635 void Metaspace::post_initialize() {
 636   MetaspaceGC::post_initialize();
 637 }
 638 
 639 void Metaspace::verify_global_initialization() {
 640   assert(space_list() != NULL, "Metadata VirtualSpaceList has not been initialized");
 641   assert(chunk_manager_metadata() != NULL, "Metadata ChunkManager has not been initialized");
 642 
 643   if (using_class_space()) {
 644     assert(class_space_list() != NULL, "Class VirtualSpaceList has not been initialized");
 645     assert(chunk_manager_class() != NULL, "Class ChunkManager has not been initialized");
 646   }
 647 }
 648 




 649 
 650 MetaWord* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size,
 651                               MetaspaceObj::Type type, TRAPS) {
 652   assert(!_frozen, "sanity");
 653   assert(!(DumpSharedSpaces && THREAD->is_VM_thread()), "sanity");
 654 
 655   if (HAS_PENDING_EXCEPTION) {
 656     assert(false, "Should not allocate with exception pending");
 657     return NULL;  // caller does a CHECK_NULL too
 658   }
 659 
 660   assert(loader_data != NULL, "Should never pass around a NULL loader_data. "
 661         "ClassLoaderData::the_null_class_loader_data() should have been used.");
 662 
 663   MetadataType mdtype = (type == MetaspaceObj::ClassType) ? ClassType : NonClassType;
 664 
 665   // Try to allocate metadata.
 666   MetaWord* result = loader_data->metaspace_non_null()->allocate(word_size, mdtype);
 667 
 668   if (result == NULL) {


 767                  Mutex::_no_safepoint_check_flag);
 768   purge(NonClassType);
 769   if (using_class_space()) {
 770     purge(ClassType);
 771   }
 772 }
 773 
 774 bool Metaspace::contains(const void* ptr) {
 775   if (MetaspaceShared::is_in_shared_metaspace(ptr)) {
 776     return true;
 777   }
 778   return contains_non_shared(ptr);
 779 }
 780 
 781 bool Metaspace::contains_non_shared(const void* ptr) {
 782   if (using_class_space() && get_space_list(ClassType)->contains(ptr)) {
 783      return true;
 784   }
 785 
 786   return get_space_list(NonClassType)->contains(ptr);








































































































































































 787 }
 788 
 789 /////////////// Unit tests ///////////////
 790 
 791 struct chunkmanager_statistics_t {
 792   int num_specialized_chunks;
 793   int num_small_chunks;
 794   int num_medium_chunks;
 795   int num_humongous_chunks;
 796 };
 797 
 798 extern void test_metaspace_retrieve_chunkmanager_statistics(Metaspace::MetadataType mdType, chunkmanager_statistics_t* out) {
 799   ChunkManager* const chunk_manager = Metaspace::get_chunk_manager(mdType);
 800   ChunkManagerStatistics stat;
 801   chunk_manager->collect_statistics(&stat);
 802   out->num_specialized_chunks = (int)stat.chunk_stats(SpecializedIndex).num();
 803   out->num_small_chunks = (int)stat.chunk_stats(SmallIndex).num();
 804   out->num_medium_chunks = (int)stat.chunk_stats(MediumIndex).num();
 805   out->num_humongous_chunks = (int)stat.chunk_stats(HumongousIndex).num();
 806 }
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