jdk8-mips64-public/hotspot: src/share/vm/memory/metaspace.cpp@acf02173a790 (annotated)

src/share/vm/memory/metaspace.cpp@acf02173a790 (annotated)

src/share/vm/memory/metaspace.cpp

Thu, 22 Nov 2018 11:02:39 +0800

author: wanghaomin
date: Thu, 22 Nov 2018 11:02:39 +0800
changeset 9268: acf02173a790
parent 9122: 024be04bb151
child 9448: 73d689add964
permissions: -rw-r--r--

#7856 Compressed class space not allocated in lower regions. [Backport of JDK-8159056]
Reviewed-by: aoqi

 /*
  * Copyright (c) 2011, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "gc_interface/collectedHeap.hpp"
 #include "memory/allocation.hpp"
 #include "memory/binaryTreeDictionary.hpp"
 #include "memory/freeList.hpp"
 #include "memory/collectorPolicy.hpp"
 #include "memory/filemap.hpp"
 #include "memory/freeList.hpp"
 #include "memory/gcLocker.hpp"
 #include "memory/metachunk.hpp"
 #include "memory/metaspace.hpp"
 #include "memory/metaspaceGCThresholdUpdater.hpp"
 #include "memory/metaspaceShared.hpp"
 #include "memory/metaspaceTracer.hpp"
 #include "memory/resourceArea.hpp"
 #include "memory/universe.hpp"
 #include "runtime/atomic.inline.hpp"
 #include "runtime/globals.hpp"
 #include "runtime/init.hpp"
 #include "runtime/java.hpp"
 #include "runtime/mutex.hpp"
 #include "runtime/orderAccess.inline.hpp"
 #include "services/memTracker.hpp"
 #include "services/memoryService.hpp"
 #include "utilities/copy.hpp"
 #include "utilities/debug.hpp"
 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
 typedef BinaryTreeDictionary<Metablock, FreeList<Metablock> > BlockTreeDictionary;
 typedef BinaryTreeDictionary<Metachunk, FreeList<Metachunk> > ChunkTreeDictionary;
 // Set this constant to enable slow integrity checking of the free chunk lists
 const bool metaspace_slow_verify = false;
 size_t const allocation_from_dictionary_limit = 4 * K;
 MetaWord* last_allocated = 0;
 size_t Metaspace::_compressed_class_space_size;
 const MetaspaceTracer* Metaspace::_tracer = NULL;
 // Used in declarations in SpaceManager and ChunkManager
 enum ChunkIndex {
   ZeroIndex = 0,
   SpecializedIndex = ZeroIndex,
   SmallIndex = SpecializedIndex + 1,
   MediumIndex = SmallIndex + 1,
   HumongousIndex = MediumIndex + 1,
   NumberOfFreeLists = 3,
   NumberOfInUseLists = 4
 };
 enum ChunkSizes {    // in words.
   ClassSpecializedChunk = 128,
   SpecializedChunk = 128,
   ClassSmallChunk = 256,
   SmallChunk = 512,
   ClassMediumChunk = 4 * K,
   MediumChunk = 8 * K
 };
 static ChunkIndex next_chunk_index(ChunkIndex i) {
   assert(i < NumberOfInUseLists, "Out of bound");
   return (ChunkIndex) (i+1);
 }
 volatile intptr_t MetaspaceGC::_capacity_until_GC = 0;
 uint MetaspaceGC::_shrink_factor = 0;
 bool MetaspaceGC::_should_concurrent_collect = false;
 typedef class FreeList<Metachunk> ChunkList;
 // Manages the global free lists of chunks.
 class ChunkManager : public CHeapObj<mtInternal> {
   friend class TestVirtualSpaceNodeTest;
   // Free list of chunks of different sizes.
   //   SpecializedChunk
   //   SmallChunk
   //   MediumChunk
   //   HumongousChunk
   ChunkList _free_chunks[NumberOfFreeLists];
   //   HumongousChunk
   ChunkTreeDictionary _humongous_dictionary;
   // ChunkManager in all lists of this type
   size_t _free_chunks_total;
   size_t _free_chunks_count;
   void dec_free_chunks_total(size_t v) {
     assert(_free_chunks_count > 0 &&
              _free_chunks_total > 0,
              "About to go negative");
     Atomic::add_ptr(-1, &_free_chunks_count);
     jlong minus_v = (jlong) - (jlong) v;
     Atomic::add_ptr(minus_v, &_free_chunks_total);
   }
   // Debug support
   size_t sum_free_chunks();
   size_t sum_free_chunks_count();
   void locked_verify_free_chunks_total();
   void slow_locked_verify_free_chunks_total() {
     if (metaspace_slow_verify) {
       locked_verify_free_chunks_total();
     }
   }
   void locked_verify_free_chunks_count();
   void slow_locked_verify_free_chunks_count() {
     if (metaspace_slow_verify) {
       locked_verify_free_chunks_count();
     }
   }
   void verify_free_chunks_count();
  public:
   ChunkManager(size_t specialized_size, size_t small_size, size_t medium_size)
       : _free_chunks_total(0), _free_chunks_count(0) {
     _free_chunks[SpecializedIndex].set_size(specialized_size);
     _free_chunks[SmallIndex].set_size(small_size);
     _free_chunks[MediumIndex].set_size(medium_size);
   }
   // add or delete (return) a chunk to the global freelist.
   Metachunk* chunk_freelist_allocate(size_t word_size);
   // Map a size to a list index assuming that there are lists
   // for special, small, medium, and humongous chunks.
   ChunkIndex list_index(size_t size);
   // Remove the chunk from its freelist.  It is
   // expected to be on one of the _free_chunks[] lists.
   void remove_chunk(Metachunk* chunk);
   // Add the simple linked list of chunks to the freelist of chunks
   // of type index.
   void return_chunks(ChunkIndex index, Metachunk* chunks);
   // Total of the space in the free chunks list
   size_t free_chunks_total_words();
   size_t free_chunks_total_bytes();
   // Number of chunks in the free chunks list
   size_t free_chunks_count();
   void inc_free_chunks_total(size_t v, size_t count = 1) {
     Atomic::add_ptr(count, &_free_chunks_count);
     Atomic::add_ptr(v, &_free_chunks_total);
   }
   ChunkTreeDictionary* humongous_dictionary() {
     return &_humongous_dictionary;
   }
   ChunkList* free_chunks(ChunkIndex index);
   // Returns the list for the given chunk word size.
   ChunkList* find_free_chunks_list(size_t word_size);
   // Remove from a list by size.  Selects list based on size of chunk.
   Metachunk* free_chunks_get(size_t chunk_word_size);
 #define index_bounds_check(index)                                         \
   assert(index == SpecializedIndex ||                                     \
          index == SmallIndex ||                                           \
          index == MediumIndex ||                                          \
          index == HumongousIndex, err_msg("Bad index: %d", (int) index))
   size_t num_free_chunks(ChunkIndex index) const {
     index_bounds_check(index);
     if (index == HumongousIndex) {
       return _humongous_dictionary.total_free_blocks();
     }
     ssize_t count = _free_chunks[index].count();
     return count == -1 ? 0 : (size_t) count;
   }
   size_t size_free_chunks_in_bytes(ChunkIndex index) const {
     index_bounds_check(index);
     size_t word_size = 0;
     if (index == HumongousIndex) {
       word_size = _humongous_dictionary.total_size();
     } else {
       const size_t size_per_chunk_in_words = _free_chunks[index].size();
       word_size = size_per_chunk_in_words * num_free_chunks(index);
     }
     return word_size * BytesPerWord;
   }
   MetaspaceChunkFreeListSummary chunk_free_list_summary() const {
     return MetaspaceChunkFreeListSummary(num_free_chunks(SpecializedIndex),
                                          num_free_chunks(SmallIndex),
                                          num_free_chunks(MediumIndex),
                                          num_free_chunks(HumongousIndex),
                                          size_free_chunks_in_bytes(SpecializedIndex),
                                          size_free_chunks_in_bytes(SmallIndex),
                                          size_free_chunks_in_bytes(MediumIndex),
                                          size_free_chunks_in_bytes(HumongousIndex));
   }
   // Debug support
   void verify();
   void slow_verify() {
     if (metaspace_slow_verify) {
       verify();
     }
   }
   void locked_verify();
   void slow_locked_verify() {
     if (metaspace_slow_verify) {
       locked_verify();
     }
   }
   void verify_free_chunks_total();
   void locked_print_free_chunks(outputStream* st);
   void locked_print_sum_free_chunks(outputStream* st);
   void print_on(outputStream* st) const;
 };
 // Used to manage the free list of Metablocks (a block corresponds
 // to the allocation of a quantum of metadata).
 class BlockFreelist VALUE_OBJ_CLASS_SPEC {
   BlockTreeDictionary* _dictionary;
   // Only allocate and split from freelist if the size of the allocation
   // is at least 1/4th the size of the available block.
   const static int WasteMultiplier = 4;
   // Accessors
   BlockTreeDictionary* dictionary() const { return _dictionary; }
  public:
   BlockFreelist();
   ~BlockFreelist();
   // Get and return a block to the free list
   MetaWord* get_block(size_t word_size);
   void return_block(MetaWord* p, size_t word_size);
   size_t total_size() {
   if (dictionary() == NULL) {
     return 0;
   } else {
     return dictionary()->total_size();
   }
 }
   void print_on(outputStream* st) const;
 };
 // A VirtualSpaceList node.
 class VirtualSpaceNode : public CHeapObj<mtClass> {
   friend class VirtualSpaceList;
   // Link to next VirtualSpaceNode
   VirtualSpaceNode* _next;
   // total in the VirtualSpace
   MemRegion _reserved;
   ReservedSpace _rs;
   VirtualSpace _virtual_space;
   MetaWord* _top;
   // count of chunks contained in this VirtualSpace
   uintx _container_count;
   // Convenience functions to access the _virtual_space
   char* low()  const { return virtual_space()->low(); }
   char* high() const { return virtual_space()->high(); }
   // The first Metachunk will be allocated at the bottom of the
   // VirtualSpace
   Metachunk* first_chunk() { return (Metachunk*) bottom(); }
   // Committed but unused space in the virtual space
   size_t free_words_in_vs() const;
  public:
   VirtualSpaceNode(size_t byte_size);
   VirtualSpaceNode(ReservedSpace rs) : _top(NULL), _next(NULL), _rs(rs), _container_count(0) {}
   ~VirtualSpaceNode();
   // Convenience functions for logical bottom and end
   MetaWord* bottom() const { return (MetaWord*) _virtual_space.low(); }
   MetaWord* end() const { return (MetaWord*) _virtual_space.high(); }
   bool contains(const void* ptr) { return ptr >= low() && ptr < high(); }
   size_t reserved_words() const  { return _virtual_space.reserved_size() / BytesPerWord; }
   size_t committed_words() const { return _virtual_space.actual_committed_size() / BytesPerWord; }
   bool is_pre_committed() const { return _virtual_space.special(); }
   // address of next available space in _virtual_space;
   // Accessors
   VirtualSpaceNode* next() { return _next; }
   void set_next(VirtualSpaceNode* v) { _next = v; }
   void set_reserved(MemRegion const v) { _reserved = v; }
   void set_top(MetaWord* v) { _top = v; }
   // Accessors
   MemRegion* reserved() { return &_reserved; }
   VirtualSpace* virtual_space() const { return (VirtualSpace*) &_virtual_space; }
   // Returns true if "word_size" is available in the VirtualSpace
   bool is_available(size_t word_size) { return word_size <= pointer_delta(end(), _top, sizeof(MetaWord)); }
   MetaWord* top() const { return _top; }
   void inc_top(size_t word_size) { _top += word_size; }
   uintx container_count() { return _container_count; }
   void inc_container_count();
   void dec_container_count();
 #ifdef ASSERT
   uint container_count_slow();
   void verify_container_count();
 #endif
   // used and capacity in this single entry in the list
   size_t used_words_in_vs() const;
   size_t capacity_words_in_vs() const;
   bool initialize();
   // get space from the virtual space
   Metachunk* take_from_committed(size_t chunk_word_size);
   // Allocate a chunk from the virtual space and return it.
   Metachunk* get_chunk_vs(size_t chunk_word_size);
   // Expands/shrinks the committed space in a virtual space.  Delegates
   // to Virtualspace
   bool expand_by(size_t min_words, size_t preferred_words);
   // In preparation for deleting this node, remove all the chunks
   // in the node from any freelist.
   void purge(ChunkManager* chunk_manager);
   // If an allocation doesn't fit in the current node a new node is created.
   // Allocate chunks out of the remaining committed space in this node
   // to avoid wasting that memory.
   // This always adds up because all the chunk sizes are multiples of
   // the smallest chunk size.
   void retire(ChunkManager* chunk_manager);
 #ifdef ASSERT
   // Debug support
   void mangle();
 #endif
   void print_on(outputStream* st) const;
 };
 #define assert_is_ptr_aligned(ptr, alignment) \
   assert(is_ptr_aligned(ptr, alignment),      \
     err_msg(PTR_FORMAT " is not aligned to "  \
       SIZE_FORMAT, ptr, alignment))
 #define assert_is_size_aligned(size, alignment) \
   assert(is_size_aligned(size, alignment),      \
     err_msg(SIZE_FORMAT " is not aligned to "   \
        SIZE_FORMAT, size, alignment))
 // Decide if large pages should be committed when the memory is reserved.
 static bool should_commit_large_pages_when_reserving(size_t bytes) {
   if (UseLargePages && UseLargePagesInMetaspace && !os::can_commit_large_page_memory()) {
     size_t words = bytes / BytesPerWord;
     bool is_class = false; // We never reserve large pages for the class space.
     if (MetaspaceGC::can_expand(words, is_class) &&
         MetaspaceGC::allowed_expansion() >= words) {
       return true;
     }
   }
   return false;
 }
   // byte_size is the size of the associated virtualspace.
 VirtualSpaceNode::VirtualSpaceNode(size_t bytes) : _top(NULL), _next(NULL), _rs(), _container_count(0) {
   assert_is_size_aligned(bytes, Metaspace::reserve_alignment());
 #if INCLUDE_CDS
   // This allocates memory with mmap.  For DumpSharedspaces, try to reserve
   // configurable address, generally at the top of the Java heap so other
   // memory addresses don't conflict.
   if (DumpSharedSpaces) {
     bool large_pages = false; // No large pages when dumping the CDS archive.
     char* shared_base = (char*)align_ptr_up((char*)SharedBaseAddress, Metaspace::reserve_alignment());
     _rs = ReservedSpace(bytes, Metaspace::reserve_alignment(), large_pages, shared_base, 0);
     if (_rs.is_reserved()) {
       assert(shared_base == 0 || _rs.base() == shared_base, "should match");
     } else {
       // Get a mmap region anywhere if the SharedBaseAddress fails.
       _rs = ReservedSpace(bytes, Metaspace::reserve_alignment(), large_pages);
     }
     MetaspaceShared::set_shared_rs(&_rs);
   } else
 #endif
   {
     bool large_pages = should_commit_large_pages_when_reserving(bytes);
     _rs = ReservedSpace(bytes, Metaspace::reserve_alignment(), large_pages);
   }
   if (_rs.is_reserved()) {
     assert(_rs.base() != NULL, "Catch if we get a NULL address");
     assert(_rs.size() != 0, "Catch if we get a 0 size");
     assert_is_ptr_aligned(_rs.base(), Metaspace::reserve_alignment());
     assert_is_size_aligned(_rs.size(), Metaspace::reserve_alignment());
     MemTracker::record_virtual_memory_type((address)_rs.base(), mtClass);
   }
 }
 void VirtualSpaceNode::purge(ChunkManager* chunk_manager) {
   Metachunk* chunk = first_chunk();
   Metachunk* invalid_chunk = (Metachunk*) top();
   while (chunk < invalid_chunk ) {
     assert(chunk->is_tagged_free(), "Should be tagged free");
     MetaWord* next = ((MetaWord*)chunk) + chunk->word_size();
     chunk_manager->remove_chunk(chunk);
     assert(chunk->next() == NULL &&
            chunk->prev() == NULL,
            "Was not removed from its list");
     chunk = (Metachunk*) next;
   }
 }
 #ifdef ASSERT
 uint VirtualSpaceNode::container_count_slow() {
   uint count = 0;
   Metachunk* chunk = first_chunk();
   Metachunk* invalid_chunk = (Metachunk*) top();
   while (chunk < invalid_chunk ) {
     MetaWord* next = ((MetaWord*)chunk) + chunk->word_size();
     // Don't count the chunks on the free lists.  Those are
     // still part of the VirtualSpaceNode but not currently
     // counted.
     if (!chunk->is_tagged_free()) {
       count++;
     }
     chunk = (Metachunk*) next;
   }
   return count;
 }
 #endif
 // List of VirtualSpaces for metadata allocation.
 class VirtualSpaceList : public CHeapObj<mtClass> {
   friend class VirtualSpaceNode;
   enum VirtualSpaceSizes {
     VirtualSpaceSize = 256 * K
   };
   // Head of the list
   VirtualSpaceNode* _virtual_space_list;
   // virtual space currently being used for allocations
   VirtualSpaceNode* _current_virtual_space;
   // Is this VirtualSpaceList used for the compressed class space
   bool _is_class;
   // Sum of reserved and committed memory in the virtual spaces
   size_t _reserved_words;
   size_t _committed_words;
   // Number of virtual spaces
   size_t _virtual_space_count;
   ~VirtualSpaceList();
   VirtualSpaceNode* virtual_space_list() const { return _virtual_space_list; }
   void set_virtual_space_list(VirtualSpaceNode* v) {
     _virtual_space_list = v;
   }
   void set_current_virtual_space(VirtualSpaceNode* v) {
     _current_virtual_space = v;
   }
   void link_vs(VirtualSpaceNode* new_entry);
   // Get another virtual space and add it to the list.  This
   // is typically prompted by a failed attempt to allocate a chunk
   // and is typically followed by the allocation of a chunk.
   bool create_new_virtual_space(size_t vs_word_size);
   // Chunk up the unused committed space in the current
   // virtual space and add the chunks to the free list.
   void retire_current_virtual_space();
  public:
   VirtualSpaceList(size_t word_size);
   VirtualSpaceList(ReservedSpace rs);
   size_t free_bytes();
   Metachunk* get_new_chunk(size_t chunk_word_size,
                            size_t suggested_commit_granularity);
   bool expand_node_by(VirtualSpaceNode* node,
                       size_t min_words,
                       size_t preferred_words);
   bool expand_by(size_t min_words,
                  size_t preferred_words);
   VirtualSpaceNode* current_virtual_space() {
     return _current_virtual_space;
   }
   bool is_class() const { return _is_class; }
   bool initialization_succeeded() { return _virtual_space_list != NULL; }
   size_t reserved_words()  { return _reserved_words; }
   size_t reserved_bytes()  { return reserved_words() * BytesPerWord; }
   size_t committed_words() { return _committed_words; }
   size_t committed_bytes() { return committed_words() * BytesPerWord; }
   void inc_reserved_words(size_t v);
   void dec_reserved_words(size_t v);
   void inc_committed_words(size_t v);
   void dec_committed_words(size_t v);
   void inc_virtual_space_count();
   void dec_virtual_space_count();
   bool contains(const void* ptr);
   // Unlink empty VirtualSpaceNodes and free it.
   void purge(ChunkManager* chunk_manager);
   void print_on(outputStream* st) const;
   class VirtualSpaceListIterator : public StackObj {
     VirtualSpaceNode* _virtual_spaces;
    public:
     VirtualSpaceListIterator(VirtualSpaceNode* virtual_spaces) :
       _virtual_spaces(virtual_spaces) {}
     bool repeat() {
       return _virtual_spaces != NULL;
     }
     VirtualSpaceNode* get_next() {
       VirtualSpaceNode* result = _virtual_spaces;
       if (_virtual_spaces != NULL) {
         _virtual_spaces = _virtual_spaces->next();
       }
       return result;
     }
   };
 };
 class Metadebug : AllStatic {
   // Debugging support for Metaspaces
   static int _allocation_fail_alot_count;
  public:
   static void init_allocation_fail_alot_count();
 #ifdef ASSERT
   static bool test_metadata_failure();
 #endif
 };
 int Metadebug::_allocation_fail_alot_count = 0;
 //  SpaceManager - used by Metaspace to handle allocations
 class SpaceManager : public CHeapObj<mtClass> {
   friend class Metaspace;
   friend class Metadebug;
  private:
   // protects allocations
   Mutex* const _lock;
   // Type of metadata allocated.
   Metaspace::MetadataType _mdtype;
   // List of chunks in use by this SpaceManager.  Allocations
   // are done from the current chunk.  The list is used for deallocating
   // chunks when the SpaceManager is freed.
   Metachunk* _chunks_in_use[NumberOfInUseLists];
   Metachunk* _current_chunk;
   // Number of small chunks to allocate to a manager
   // If class space manager, small chunks are unlimited
   static uint const _small_chunk_limit;
   // Sum of all space in allocated chunks
   size_t _allocated_blocks_words;
   // Sum of all allocated chunks
   size_t _allocated_chunks_words;
   size_t _allocated_chunks_count;
   // Free lists of blocks are per SpaceManager since they
   // are assumed to be in chunks in use by the SpaceManager
   // and all chunks in use by a SpaceManager are freed when
   // the class loader using the SpaceManager is collected.
   BlockFreelist _block_freelists;
   // protects virtualspace and chunk expansions
   static const char*  _expand_lock_name;
   static const int    _expand_lock_rank;
   static Mutex* const _expand_lock;
  private:
   // Accessors
   Metachunk* chunks_in_use(ChunkIndex index) const { return _chunks_in_use[index]; }
   void set_chunks_in_use(ChunkIndex index, Metachunk* v) {
     _chunks_in_use[index] = v;
   }
   BlockFreelist* block_freelists() const {
     return (BlockFreelist*) &_block_freelists;
   }
   Metaspace::MetadataType mdtype() { return _mdtype; }
   VirtualSpaceList* vs_list()   const { return Metaspace::get_space_list(_mdtype); }
   ChunkManager* chunk_manager() const { return Metaspace::get_chunk_manager(_mdtype); }
   Metachunk* current_chunk() const { return _current_chunk; }
   void set_current_chunk(Metachunk* v) {
     _current_chunk = v;
   }
   Metachunk* find_current_chunk(size_t word_size);
   // Add chunk to the list of chunks in use
   void add_chunk(Metachunk* v, bool make_current);
   void retire_current_chunk();
   Mutex* lock() const { return _lock; }
   const char* chunk_size_name(ChunkIndex index) const;
  protected:
   void initialize();
  public:
   SpaceManager(Metaspace::MetadataType mdtype,
                Mutex* lock);
   ~SpaceManager();
   enum ChunkMultiples {
     MediumChunkMultiple = 4
   };
   static size_t specialized_chunk_size(bool is_class) { return is_class ? ClassSpecializedChunk : SpecializedChunk; }
   static size_t small_chunk_size(bool is_class)       { return is_class ? ClassSmallChunk : SmallChunk; }
   static size_t medium_chunk_size(bool is_class)      { return is_class ? ClassMediumChunk : MediumChunk; }
   static size_t smallest_chunk_size(bool is_class)    { return specialized_chunk_size(is_class); }
   // Accessors
   bool is_class() const { return _mdtype == Metaspace::ClassType; }
   size_t specialized_chunk_size() const { return specialized_chunk_size(is_class()); }
   size_t small_chunk_size()       const { return small_chunk_size(is_class()); }
   size_t medium_chunk_size()      const { return medium_chunk_size(is_class()); }
   size_t smallest_chunk_size()    const { return smallest_chunk_size(is_class()); }
   size_t medium_chunk_bunch()     const { return medium_chunk_size() * MediumChunkMultiple; }
   size_t allocated_blocks_words() const { return _allocated_blocks_words; }
   size_t allocated_blocks_bytes() const { return _allocated_blocks_words * BytesPerWord; }
   size_t allocated_chunks_words() const { return _allocated_chunks_words; }
   size_t allocated_chunks_bytes() const { return _allocated_chunks_words * BytesPerWord; }
   size_t allocated_chunks_count() const { return _allocated_chunks_count; }
   bool is_humongous(size_t word_size) { return word_size > medium_chunk_size(); }
   static Mutex* expand_lock() { return _expand_lock; }
   // Increment the per Metaspace and global running sums for Metachunks
   // by the given size.  This is used when a Metachunk to added to
   // the in-use list.
   void inc_size_metrics(size_t words);
   // Increment the per Metaspace and global running sums Metablocks by the given
   // size.  This is used when a Metablock is allocated.
   void inc_used_metrics(size_t words);
   // Delete the portion of the running sums for this SpaceManager. That is,
   // the globals running sums for the Metachunks and Metablocks are
   // decremented for all the Metachunks in-use by this SpaceManager.
   void dec_total_from_size_metrics();
   // Adjust the initial chunk size to match one of the fixed chunk list sizes,
   // or return the unadjusted size if the requested size is humongous.
   static size_t adjust_initial_chunk_size(size_t requested, bool is_class_space);
   size_t adjust_initial_chunk_size(size_t requested) const;
   // Get the initial chunks size for this metaspace type.
   size_t get_initial_chunk_size(Metaspace::MetaspaceType type) const;
   size_t sum_capacity_in_chunks_in_use() const;
   size_t sum_used_in_chunks_in_use() const;
   size_t sum_free_in_chunks_in_use() const;
   size_t sum_waste_in_chunks_in_use() const;
   size_t sum_waste_in_chunks_in_use(ChunkIndex index ) const;
   size_t sum_count_in_chunks_in_use();
   size_t sum_count_in_chunks_in_use(ChunkIndex i);
   Metachunk* get_new_chunk(size_t chunk_word_size);
   // Block allocation and deallocation.
   // Allocates a block from the current chunk
   MetaWord* allocate(size_t word_size);
   // Helper for allocations
   MetaWord* allocate_work(size_t word_size);
   // Returns a block to the per manager freelist
   void deallocate(MetaWord* p, size_t word_size);
   // Based on the allocation size and a minimum chunk size,
   // returned chunk size (for expanding space for chunk allocation).
   size_t calc_chunk_size(size_t allocation_word_size);
   // Called when an allocation from the current chunk fails.
   // Gets a new chunk (may require getting a new virtual space),
   // and allocates from that chunk.
   MetaWord* grow_and_allocate(size_t word_size);
   // Notify memory usage to MemoryService.
   void track_metaspace_memory_usage();
   // debugging support.
   void dump(outputStream* const out) const;
   void print_on(outputStream* st) const;
   void locked_print_chunks_in_use_on(outputStream* st) const;
   void verify();
   void verify_chunk_size(Metachunk* chunk);
   NOT_PRODUCT(void mangle_freed_chunks();)
 #ifdef ASSERT
   void verify_allocated_blocks_words();
 #endif
   size_t get_raw_word_size(size_t word_size) {
     size_t byte_size = word_size * BytesPerWord;
     size_t raw_bytes_size = MAX2(byte_size, sizeof(Metablock));
     raw_bytes_size = align_size_up(raw_bytes_size, Metachunk::object_alignment());
     size_t raw_word_size = raw_bytes_size / BytesPerWord;
     assert(raw_word_size * BytesPerWord == raw_bytes_size, "Size problem");
     return raw_word_size;
   }
 };
 uint const SpaceManager::_small_chunk_limit = 4;
 const char* SpaceManager::_expand_lock_name =
   "SpaceManager chunk allocation lock";
 const int SpaceManager::_expand_lock_rank = Monitor::leaf - 1;
 Mutex* const SpaceManager::_expand_lock =
   new Mutex(SpaceManager::_expand_lock_rank,
             SpaceManager::_expand_lock_name,
             Mutex::_allow_vm_block_flag);
 void VirtualSpaceNode::inc_container_count() {
   assert_lock_strong(SpaceManager::expand_lock());
   _container_count++;
   assert(_container_count == container_count_slow(),
          err_msg("Inconsistency in countainer_count _container_count " SIZE_FORMAT
                  " container_count_slow() " SIZE_FORMAT,
                  _container_count, container_count_slow()));
 }
 void VirtualSpaceNode::dec_container_count() {
   assert_lock_strong(SpaceManager::expand_lock());
   _container_count--;
 }
 #ifdef ASSERT
 void VirtualSpaceNode::verify_container_count() {
   assert(_container_count == container_count_slow(),
     err_msg("Inconsistency in countainer_count _container_count " SIZE_FORMAT
             " container_count_slow() " SIZE_FORMAT, _container_count, container_count_slow()));
 }
 #endif
 // BlockFreelist methods
 BlockFreelist::BlockFreelist() : _dictionary(NULL) {}
 BlockFreelist::~BlockFreelist() {
   if (_dictionary != NULL) {
     if (Verbose && TraceMetadataChunkAllocation) {
       _dictionary->print_free_lists(gclog_or_tty);
     }
     delete _dictionary;
   }
 }
 void BlockFreelist::return_block(MetaWord* p, size_t word_size) {
   Metablock* free_chunk = ::new (p) Metablock(word_size);
   if (dictionary() == NULL) {
    _dictionary = new BlockTreeDictionary();
   }
   dictionary()->return_chunk(free_chunk);
 }
 MetaWord* BlockFreelist::get_block(size_t word_size) {
   if (dictionary() == NULL) {
     return NULL;
   }
   if (word_size < TreeChunk<Metablock, FreeList<Metablock> >::min_size()) {
     // Dark matter.  Too small for dictionary.
     return NULL;
   }
   Metablock* free_block =
     dictionary()->get_chunk(word_size, FreeBlockDictionary<Metablock>::atLeast);
   if (free_block == NULL) {
     return NULL;
   }
   const size_t block_size = free_block->size();
   if (block_size > WasteMultiplier * word_size) {
     return_block((MetaWord*)free_block, block_size);
     return NULL;
   }
   MetaWord* new_block = (MetaWord*)free_block;
   assert(block_size >= word_size, "Incorrect size of block from freelist");
   const size_t unused = block_size - word_size;
   if (unused >= TreeChunk<Metablock, FreeList<Metablock> >::min_size()) {
     return_block(new_block + word_size, unused);
   }
   return new_block;
 }
 void BlockFreelist::print_on(outputStream* st) const {
   if (dictionary() == NULL) {
     return;
   }
   dictionary()->print_free_lists(st);
 }
 // VirtualSpaceNode methods
 VirtualSpaceNode::~VirtualSpaceNode() {
   _rs.release();
 #ifdef ASSERT
   size_t word_size = sizeof(*this) / BytesPerWord;
   Copy::fill_to_words((HeapWord*) this, word_size, 0xf1f1f1f1);
 #endif
 }
 size_t VirtualSpaceNode::used_words_in_vs() const {
   return pointer_delta(top(), bottom(), sizeof(MetaWord));
 }
 // Space committed in the VirtualSpace
 size_t VirtualSpaceNode::capacity_words_in_vs() const {
   return pointer_delta(end(), bottom(), sizeof(MetaWord));
 }
 size_t VirtualSpaceNode::free_words_in_vs() const {
   return pointer_delta(end(), top(), sizeof(MetaWord));
 }
 // Allocates the chunk from the virtual space only.
 // This interface is also used internally for debugging.  Not all
 // chunks removed here are necessarily used for allocation.
 Metachunk* VirtualSpaceNode::take_from_committed(size_t chunk_word_size) {
   // Bottom of the new chunk
   MetaWord* chunk_limit = top();
   assert(chunk_limit != NULL, "Not safe to call this method");
   // The virtual spaces are always expanded by the
   // commit granularity to enforce the following condition.
   // Without this the is_available check will not work correctly.
   assert(_virtual_space.committed_size() == _virtual_space.actual_committed_size(),
       "The committed memory doesn't match the expanded memory.");
   if (!is_available(chunk_word_size)) {
     if (TraceMetadataChunkAllocation) {
       gclog_or_tty->print("VirtualSpaceNode::take_from_committed() not available %d words ", chunk_word_size);
       // Dump some information about the virtual space that is nearly full
       print_on(gclog_or_tty);
     }
     return NULL;
   }
   // Take the space  (bump top on the current virtual space).
   inc_top(chunk_word_size);
   // Initialize the chunk
   Metachunk* result = ::new (chunk_limit) Metachunk(chunk_word_size, this);
   return result;
 }
 // Expand the virtual space (commit more of the reserved space)
 bool VirtualSpaceNode::expand_by(size_t min_words, size_t preferred_words) {
   size_t min_bytes = min_words * BytesPerWord;
   size_t preferred_bytes = preferred_words * BytesPerWord;
   size_t uncommitted = virtual_space()->reserved_size() - virtual_space()->actual_committed_size();
   if (uncommitted < min_bytes) {
     return false;
   }
   size_t commit = MIN2(preferred_bytes, uncommitted);
   bool result = virtual_space()->expand_by(commit, false);
   assert(result, "Failed to commit memory");
   return result;
 }
 Metachunk* VirtualSpaceNode::get_chunk_vs(size_t chunk_word_size) {
   assert_lock_strong(SpaceManager::expand_lock());
   Metachunk* result = take_from_committed(chunk_word_size);
   if (result != NULL) {
     inc_container_count();
   }
   return result;
 }
 bool VirtualSpaceNode::initialize() {
   if (!_rs.is_reserved()) {
     return false;
   }
   // These are necessary restriction to make sure that the virtual space always
   // grows in steps of Metaspace::commit_alignment(). If both base and size are
   // aligned only the middle alignment of the VirtualSpace is used.
   assert_is_ptr_aligned(_rs.base(), Metaspace::commit_alignment());
   assert_is_size_aligned(_rs.size(), Metaspace::commit_alignment());
   // ReservedSpaces marked as special will have the entire memory
   // pre-committed. Setting a committed size will make sure that
   // committed_size and actual_committed_size agrees.
   size_t pre_committed_size = _rs.special() ? _rs.size() : 0;
   bool result = virtual_space()->initialize_with_granularity(_rs, pre_committed_size,
                                             Metaspace::commit_alignment());
   if (result) {
     assert(virtual_space()->committed_size() == virtual_space()->actual_committed_size(),
         "Checking that the pre-committed memory was registered by the VirtualSpace");
     set_top((MetaWord*)virtual_space()->low());
     set_reserved(MemRegion((HeapWord*)_rs.base(),
                  (HeapWord*)(_rs.base() + _rs.size())));
     assert(reserved()->start() == (HeapWord*) _rs.base(),
       err_msg("Reserved start was not set properly " PTR_FORMAT
         " != " PTR_FORMAT, reserved()->start(), _rs.base()));
     assert(reserved()->word_size() == _rs.size() / BytesPerWord,
       err_msg("Reserved size was not set properly " SIZE_FORMAT
         " != " SIZE_FORMAT, reserved()->word_size(),
         _rs.size() / BytesPerWord));
   }
   return result;
 }
 void VirtualSpaceNode::print_on(outputStream* st) const {
   size_t used = used_words_in_vs();
   size_t capacity = capacity_words_in_vs();
   VirtualSpace* vs = virtual_space();
   st->print_cr("   space @ " PTR_FORMAT " " SIZE_FORMAT "K, %3d%% used "
            "[" PTR_FORMAT ", " PTR_FORMAT ", "
            PTR_FORMAT ", " PTR_FORMAT ")",
            vs, capacity / K,
            capacity == 0 ? 0 : used * 100 / capacity,
            bottom(), top(), end(),
            vs->high_boundary());
 }
 #ifdef ASSERT
 void VirtualSpaceNode::mangle() {
   size_t word_size = capacity_words_in_vs();
   Copy::fill_to_words((HeapWord*) low(), word_size, 0xf1f1f1f1);
 }
 #endif // ASSERT
 // VirtualSpaceList methods
 // Space allocated from the VirtualSpace
 VirtualSpaceList::~VirtualSpaceList() {
   VirtualSpaceListIterator iter(virtual_space_list());
   while (iter.repeat()) {
     VirtualSpaceNode* vsl = iter.get_next();
     delete vsl;
   }
 }
 void VirtualSpaceList::inc_reserved_words(size_t v) {
   assert_lock_strong(SpaceManager::expand_lock());
   _reserved_words = _reserved_words + v;
 }
 void VirtualSpaceList::dec_reserved_words(size_t v) {
   assert_lock_strong(SpaceManager::expand_lock());
   _reserved_words = _reserved_words - v;
 }
 #define assert_committed_below_limit()                             \
   assert(MetaspaceAux::committed_bytes() <= MaxMetaspaceSize,      \
       err_msg("Too much committed memory. Committed: " SIZE_FORMAT \
               " limit (MaxMetaspaceSize): " SIZE_FORMAT,           \
           MetaspaceAux::committed_bytes(), MaxMetaspaceSize));
 void VirtualSpaceList::inc_committed_words(size_t v) {
   assert_lock_strong(SpaceManager::expand_lock());
   _committed_words = _committed_words + v;
   assert_committed_below_limit();
 }
 void VirtualSpaceList::dec_committed_words(size_t v) {
   assert_lock_strong(SpaceManager::expand_lock());
   _committed_words = _committed_words - v;
   assert_committed_below_limit();
 }
 void VirtualSpaceList::inc_virtual_space_count() {
   assert_lock_strong(SpaceManager::expand_lock());
   _virtual_space_count++;
 }
 void VirtualSpaceList::dec_virtual_space_count() {
   assert_lock_strong(SpaceManager::expand_lock());
   _virtual_space_count--;
 }
 void ChunkManager::remove_chunk(Metachunk* chunk) {
   size_t word_size = chunk->word_size();
   ChunkIndex index = list_index(word_size);
   if (index != HumongousIndex) {
     free_chunks(index)->remove_chunk(chunk);
   } else {
     humongous_dictionary()->remove_chunk(chunk);
   }
   // Chunk is being removed from the chunks free list.
   dec_free_chunks_total(chunk->word_size());
 }
 // Walk the list of VirtualSpaceNodes and delete
 // nodes with a 0 container_count.  Remove Metachunks in
 // the node from their respective freelists.
 void VirtualSpaceList::purge(ChunkManager* chunk_manager) {
   assert(SafepointSynchronize::is_at_safepoint(), "must be called at safepoint for contains to work");
   assert_lock_strong(SpaceManager::expand_lock());
   // Don't use a VirtualSpaceListIterator because this
   // list is being changed and a straightforward use of an iterator is not safe.
   VirtualSpaceNode* purged_vsl = NULL;
   VirtualSpaceNode* prev_vsl = virtual_space_list();
   VirtualSpaceNode* next_vsl = prev_vsl;
   while (next_vsl != NULL) {
     VirtualSpaceNode* vsl = next_vsl;
     next_vsl = vsl->next();
     // Don't free the current virtual space since it will likely
     // be needed soon.
     if (vsl->container_count() == 0 && vsl != current_virtual_space()) {
       // Unlink it from the list
       if (prev_vsl == vsl) {
         // This is the case of the current node being the first node.
         assert(vsl == virtual_space_list(), "Expected to be the first node");
         set_virtual_space_list(vsl->next());
       } else {
         prev_vsl->set_next(vsl->next());
       }
       vsl->purge(chunk_manager);
       dec_reserved_words(vsl->reserved_words());
       dec_committed_words(vsl->committed_words());
       dec_virtual_space_count();
       purged_vsl = vsl;
       delete vsl;
     } else {
       prev_vsl = vsl;
     }
   }
 #ifdef ASSERT
   if (purged_vsl != NULL) {
     // List should be stable enough to use an iterator here.
     VirtualSpaceListIterator iter(virtual_space_list());
     while (iter.repeat()) {
       VirtualSpaceNode* vsl = iter.get_next();
       assert(vsl != purged_vsl, "Purge of vsl failed");
     }
   }
 #endif
 }
 // This function looks at the mmap regions in the metaspace without locking.
 // The chunks are added with store ordering and not deleted except for at
 // unloading time during a safepoint.
 bool VirtualSpaceList::contains(const void* ptr) {
   // List should be stable enough to use an iterator here because removing virtual
   // space nodes is only allowed at a safepoint.
   VirtualSpaceListIterator iter(virtual_space_list());
   while (iter.repeat()) {
     VirtualSpaceNode* vsn = iter.get_next();
     if (vsn->contains(ptr)) {
       return true;
     }
   }
   return false;
 }
 void VirtualSpaceList::retire_current_virtual_space() {
   assert_lock_strong(SpaceManager::expand_lock());
   VirtualSpaceNode* vsn = current_virtual_space();
   ChunkManager* cm = is_class() ? Metaspace::chunk_manager_class() :
                                   Metaspace::chunk_manager_metadata();
   vsn->retire(cm);
 }
 void VirtualSpaceNode::retire(ChunkManager* chunk_manager) {
   for (int i = (int)MediumIndex; i >= (int)ZeroIndex; --i) {
     ChunkIndex index = (ChunkIndex)i;
     size_t chunk_size = chunk_manager->free_chunks(index)->size();
     while (free_words_in_vs() >= chunk_size) {
       DEBUG_ONLY(verify_container_count();)
       Metachunk* chunk = get_chunk_vs(chunk_size);
       assert(chunk != NULL, "allocation should have been successful");
       chunk_manager->return_chunks(index, chunk);
       chunk_manager->inc_free_chunks_total(chunk_size);
       DEBUG_ONLY(verify_container_count();)
     }
   }
   assert(free_words_in_vs() == 0, "should be empty now");
 }
 VirtualSpaceList::VirtualSpaceList(size_t word_size) :
                                    _is_class(false),
                                    _virtual_space_list(NULL),
                                    _current_virtual_space(NULL),
                                    _reserved_words(0),
                                    _committed_words(0),
                                    _virtual_space_count(0) {
   MutexLockerEx cl(SpaceManager::expand_lock(),
                    Mutex::_no_safepoint_check_flag);
   create_new_virtual_space(word_size);
 }
 VirtualSpaceList::VirtualSpaceList(ReservedSpace rs) :
                                    _is_class(true),
                                    _virtual_space_list(NULL),
                                    _current_virtual_space(NULL),
                                    _reserved_words(0),
                                    _committed_words(0),
                                    _virtual_space_count(0) {
   MutexLockerEx cl(SpaceManager::expand_lock(),
                    Mutex::_no_safepoint_check_flag);
   VirtualSpaceNode* class_entry = new VirtualSpaceNode(rs);
   bool succeeded = class_entry->initialize();
   if (succeeded) {
     link_vs(class_entry);
   }
 }
 size_t VirtualSpaceList::free_bytes() {
   return current_virtual_space()->free_words_in_vs() * BytesPerWord;
 }
 // Allocate another meta virtual space and add it to the list.
 bool VirtualSpaceList::create_new_virtual_space(size_t vs_word_size) {
   assert_lock_strong(SpaceManager::expand_lock());
   if (is_class()) {
     assert(false, "We currently don't support more than one VirtualSpace for"
                   " the compressed class space. The initialization of the"
                   " CCS uses another code path and should not hit this path.");
     return false;
   }
   if (vs_word_size == 0) {
     assert(false, "vs_word_size should always be at least _reserve_alignment large.");
     return false;
   }
   // Reserve the space
   size_t vs_byte_size = vs_word_size * BytesPerWord;
   assert_is_size_aligned(vs_byte_size, Metaspace::reserve_alignment());
   // Allocate the meta virtual space and initialize it.
   VirtualSpaceNode* new_entry = new VirtualSpaceNode(vs_byte_size);
   if (!new_entry->initialize()) {
     delete new_entry;
     return false;
   } else {
     assert(new_entry->reserved_words() == vs_word_size,
         "Reserved memory size differs from requested memory size");
     // ensure lock-free iteration sees fully initialized node
     OrderAccess::storestore();
     link_vs(new_entry);
     return true;
   }
 }
 void VirtualSpaceList::link_vs(VirtualSpaceNode* new_entry) {
   if (virtual_space_list() == NULL) {
       set_virtual_space_list(new_entry);
   } else {
     current_virtual_space()->set_next(new_entry);
   }
   set_current_virtual_space(new_entry);
   inc_reserved_words(new_entry->reserved_words());
   inc_committed_words(new_entry->committed_words());
   inc_virtual_space_count();
 #ifdef ASSERT
   new_entry->mangle();
 #endif
   if (TraceMetavirtualspaceAllocation && Verbose) {
     VirtualSpaceNode* vsl = current_virtual_space();
     vsl->print_on(gclog_or_tty);
   }
 }
 bool VirtualSpaceList::expand_node_by(VirtualSpaceNode* node,
                                       size_t min_words,
                                       size_t preferred_words) {
   size_t before = node->committed_words();
   bool result = node->expand_by(min_words, preferred_words);
   size_t after = node->committed_words();
   // after and before can be the same if the memory was pre-committed.
   assert(after >= before, "Inconsistency");
   inc_committed_words(after - before);
   return result;
 }
 bool VirtualSpaceList::expand_by(size_t min_words, size_t preferred_words) {
   assert_is_size_aligned(min_words,       Metaspace::commit_alignment_words());
   assert_is_size_aligned(preferred_words, Metaspace::commit_alignment_words());
   assert(min_words <= preferred_words, "Invalid arguments");
   if (!MetaspaceGC::can_expand(min_words, this->is_class())) {
     return  false;
   }
   size_t allowed_expansion_words = MetaspaceGC::allowed_expansion();
   if (allowed_expansion_words < min_words) {
     return false;
   }
   size_t max_expansion_words = MIN2(preferred_words, allowed_expansion_words);
   // Commit more memory from the the current virtual space.
   bool vs_expanded = expand_node_by(current_virtual_space(),
                                     min_words,
                                     max_expansion_words);
   if (vs_expanded) {
     return true;
   }
   retire_current_virtual_space();
   // Get another virtual space.
   size_t grow_vs_words = MAX2((size_t)VirtualSpaceSize, preferred_words);
   grow_vs_words = align_size_up(grow_vs_words, Metaspace::reserve_alignment_words());
   if (create_new_virtual_space(grow_vs_words)) {
     if (current_virtual_space()->is_pre_committed()) {
       // The memory was pre-committed, so we are done here.
       assert(min_words <= current_virtual_space()->committed_words(),
           "The new VirtualSpace was pre-committed, so it"
           "should be large enough to fit the alloc request.");
       return true;
     }
     return expand_node_by(current_virtual_space(),
                           min_words,
                           max_expansion_words);
   }
   return false;
 }
 Metachunk* VirtualSpaceList::get_new_chunk(size_t chunk_word_size, size_t suggested_commit_granularity) {
   // Allocate a chunk out of the current virtual space.
   Metachunk* next = current_virtual_space()->get_chunk_vs(chunk_word_size);
   if (next != NULL) {
     return next;
   }
   // The expand amount is currently only determined by the requested sizes
   // and not how much committed memory is left in the current virtual space.
   size_t min_word_size       = align_size_up(chunk_word_size,              Metaspace::commit_alignment_words());
   size_t preferred_word_size = align_size_up(suggested_commit_granularity, Metaspace::commit_alignment_words());
   if (min_word_size >= preferred_word_size) {
     // Can happen when humongous chunks are allocated.
     preferred_word_size = min_word_size;
   }
   bool expanded = expand_by(min_word_size, preferred_word_size);
   if (expanded) {
     next = current_virtual_space()->get_chunk_vs(chunk_word_size);
     assert(next != NULL, "The allocation was expected to succeed after the expansion");
   }
    return next;
 }
 void VirtualSpaceList::print_on(outputStream* st) const {
   if (TraceMetadataChunkAllocation && Verbose) {
     VirtualSpaceListIterator iter(virtual_space_list());
     while (iter.repeat()) {
       VirtualSpaceNode* node = iter.get_next();
       node->print_on(st);
     }
   }
 }
 // MetaspaceGC methods
 // VM_CollectForMetadataAllocation is the vm operation used to GC.
 // Within the VM operation after the GC the attempt to allocate the metadata
 // should succeed.  If the GC did not free enough space for the metaspace
 // allocation, the HWM is increased so that another virtualspace will be
 // allocated for the metadata.  With perm gen the increase in the perm
 // gen had bounds, MinMetaspaceExpansion and MaxMetaspaceExpansion.  The
 // metaspace policy uses those as the small and large steps for the HWM.
 //
 // After the GC the compute_new_size() for MetaspaceGC is called to
 // resize the capacity of the metaspaces.  The current implementation
 // is based on the flags MinMetaspaceFreeRatio and MaxMetaspaceFreeRatio used
 // to resize the Java heap by some GC's.  New flags can be implemented
 // if really needed.  MinMetaspaceFreeRatio is used to calculate how much
 // free space is desirable in the metaspace capacity to decide how much
 // to increase the HWM.  MaxMetaspaceFreeRatio is used to decide how much
 // free space is desirable in the metaspace capacity before decreasing
 // the HWM.
 // Calculate the amount to increase the high water mark (HWM).
 // Increase by a minimum amount (MinMetaspaceExpansion) so that
 // another expansion is not requested too soon.  If that is not
 // enough to satisfy the allocation, increase by MaxMetaspaceExpansion.
 // If that is still not enough, expand by the size of the allocation
 // plus some.
 size_t MetaspaceGC::delta_capacity_until_GC(size_t bytes) {
   size_t min_delta = MinMetaspaceExpansion;
   size_t max_delta = MaxMetaspaceExpansion;
   size_t delta = align_size_up(bytes, Metaspace::commit_alignment());
   if (delta <= min_delta) {
     delta = min_delta;
   } else if (delta <= max_delta) {
     // Don't want to hit the high water mark on the next
     // allocation so make the delta greater than just enough
     // for this allocation.
     delta = max_delta;
   } else {
     // This allocation is large but the next ones are probably not
     // so increase by the minimum.
     delta = delta + min_delta;
   }
   assert_is_size_aligned(delta, Metaspace::commit_alignment());
   return delta;
 }
 size_t MetaspaceGC::capacity_until_GC() {
   size_t value = (size_t)OrderAccess::load_ptr_acquire(&_capacity_until_GC);
   assert(value >= MetaspaceSize, "Not initialied properly?");
   return value;
 }
 bool MetaspaceGC::inc_capacity_until_GC(size_t v, size_t* new_cap_until_GC, size_t* old_cap_until_GC) {
   assert_is_size_aligned(v, Metaspace::commit_alignment());
   size_t capacity_until_GC = (size_t) _capacity_until_GC;
   size_t new_value = capacity_until_GC + v;
   if (new_value < capacity_until_GC) {
     // The addition wrapped around, set new_value to aligned max value.
     new_value = align_size_down(max_uintx, Metaspace::commit_alignment());
   }
   intptr_t expected = (intptr_t) capacity_until_GC;
   intptr_t actual = Atomic::cmpxchg_ptr((intptr_t) new_value, &_capacity_until_GC, expected);
   if (expected != actual) {
     return false;
   }
   if (new_cap_until_GC != NULL) {
     *new_cap_until_GC = new_value;
   }
   if (old_cap_until_GC != NULL) {
     *old_cap_until_GC = capacity_until_GC;
   }
   return true;
 }
 size_t MetaspaceGC::dec_capacity_until_GC(size_t v) {
   assert_is_size_aligned(v, Metaspace::commit_alignment());
   return (size_t)Atomic::add_ptr(-(intptr_t)v, &_capacity_until_GC);
 }
 void MetaspaceGC::initialize() {
   // Set the high-water mark to MaxMetapaceSize during VM initializaton since
   // we can't do a GC during initialization.
   _capacity_until_GC = MaxMetaspaceSize;
 }
 void MetaspaceGC::post_initialize() {
   // Reset the high-water mark once the VM initialization is done.
   _capacity_until_GC = MAX2(MetaspaceAux::committed_bytes(), MetaspaceSize);
 }
 bool MetaspaceGC::can_expand(size_t word_size, bool is_class) {
   // Check if the compressed class space is full.
   if (is_class && Metaspace::using_class_space()) {
     size_t class_committed = MetaspaceAux::committed_bytes(Metaspace::ClassType);
     if (class_committed + word_size * BytesPerWord > CompressedClassSpaceSize) {
       return false;
     }
   }
   // Check if the user has imposed a limit on the metaspace memory.
   size_t committed_bytes = MetaspaceAux::committed_bytes();
   if (committed_bytes + word_size * BytesPerWord > MaxMetaspaceSize) {
     return false;
   }
   return true;
 }
 size_t MetaspaceGC::allowed_expansion() {
   size_t committed_bytes = MetaspaceAux::committed_bytes();
   size_t capacity_until_gc = capacity_until_GC();
   assert(capacity_until_gc >= committed_bytes,
         err_msg("capacity_until_gc: " SIZE_FORMAT " < committed_bytes: " SIZE_FORMAT,
                 capacity_until_gc, committed_bytes));
   size_t left_until_max  = MaxMetaspaceSize - committed_bytes;
   size_t left_until_GC = capacity_until_gc - committed_bytes;
   size_t left_to_commit = MIN2(left_until_GC, left_until_max);
   return left_to_commit / BytesPerWord;
 }
 void MetaspaceGC::compute_new_size() {
   assert(_shrink_factor <= 100, "invalid shrink factor");
   uint current_shrink_factor = _shrink_factor;
   _shrink_factor = 0;
   // Using committed_bytes() for used_after_gc is an overestimation, since the
   // chunk free lists are included in committed_bytes() and the memory in an
   // un-fragmented chunk free list is available for future allocations.
   // However, if the chunk free lists becomes fragmented, then the memory may
   // not be available for future allocations and the memory is therefore "in use".
   // Including the chunk free lists in the definition of "in use" is therefore
   // necessary. Not including the chunk free lists can cause capacity_until_GC to
   // shrink below committed_bytes() and this has caused serious bugs in the past.
   const size_t used_after_gc = MetaspaceAux::committed_bytes();
   const size_t capacity_until_GC = MetaspaceGC::capacity_until_GC();
   const double minimum_free_percentage = MinMetaspaceFreeRatio / 100.0;
   const double maximum_used_percentage = 1.0 - minimum_free_percentage;
   const double min_tmp = used_after_gc / maximum_used_percentage;
   size_t minimum_desired_capacity =
     (size_t)MIN2(min_tmp, double(max_uintx));
   // Don't shrink less than the initial generation size
   minimum_desired_capacity = MAX2(minimum_desired_capacity,
                                   MetaspaceSize);
   if (PrintGCDetails && Verbose) {
     gclog_or_tty->print_cr("\nMetaspaceGC::compute_new_size: ");
     gclog_or_tty->print_cr("  "
                   "  minimum_free_percentage: %6.2f"
                   "  maximum_used_percentage: %6.2f",
                   minimum_free_percentage,
                   maximum_used_percentage);
     gclog_or_tty->print_cr("  "
                   "   used_after_gc       : %6.1fKB",
                   used_after_gc / (double) K);
   }
   size_t shrink_bytes = 0;
   if (capacity_until_GC < minimum_desired_capacity) {
     // If we have less capacity below the metaspace HWM, then
     // increment the HWM.
     size_t expand_bytes = minimum_desired_capacity - capacity_until_GC;
     expand_bytes = align_size_up(expand_bytes, Metaspace::commit_alignment());
     // Don't expand unless it's significant
     if (expand_bytes >= MinMetaspaceExpansion) {
       size_t new_capacity_until_GC = 0;
       bool succeeded = MetaspaceGC::inc_capacity_until_GC(expand_bytes, &new_capacity_until_GC);
       assert(succeeded, "Should always succesfully increment HWM when at safepoint");
       Metaspace::tracer()->report_gc_threshold(capacity_until_GC,
                                                new_capacity_until_GC,
                                                MetaspaceGCThresholdUpdater::ComputeNewSize);
       if (PrintGCDetails && Verbose) {
         gclog_or_tty->print_cr("    expanding:"
                       "  minimum_desired_capacity: %6.1fKB"
                       "  expand_bytes: %6.1fKB"
                       "  MinMetaspaceExpansion: %6.1fKB"
                       "  new metaspace HWM:  %6.1fKB",
                       minimum_desired_capacity / (double) K,
                       expand_bytes / (double) K,
                       MinMetaspaceExpansion / (double) K,
                       new_capacity_until_GC / (double) K);
       }
     }
     return;
   }
   // No expansion, now see if we want to shrink
   // We would never want to shrink more than this
   size_t max_shrink_bytes = capacity_until_GC - minimum_desired_capacity;
   assert(max_shrink_bytes >= 0, err_msg("max_shrink_bytes " SIZE_FORMAT,
     max_shrink_bytes));
   // Should shrinking be considered?
   if (MaxMetaspaceFreeRatio < 100) {
     const double maximum_free_percentage = MaxMetaspaceFreeRatio / 100.0;
     const double minimum_used_percentage = 1.0 - maximum_free_percentage;
     const double max_tmp = used_after_gc / minimum_used_percentage;
     size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(max_uintx));
     maximum_desired_capacity = MAX2(maximum_desired_capacity,
                                     MetaspaceSize);
     if (PrintGCDetails && Verbose) {
       gclog_or_tty->print_cr("  "
                              "  maximum_free_percentage: %6.2f"
                              "  minimum_used_percentage: %6.2f",
                              maximum_free_percentage,
                              minimum_used_percentage);
       gclog_or_tty->print_cr("  "
                              "  minimum_desired_capacity: %6.1fKB"
                              "  maximum_desired_capacity: %6.1fKB",
                              minimum_desired_capacity / (double) K,
                              maximum_desired_capacity / (double) K);
     }
     assert(minimum_desired_capacity <= maximum_desired_capacity,
            "sanity check");
     if (capacity_until_GC > maximum_desired_capacity) {
       // Capacity too large, compute shrinking size
       shrink_bytes = capacity_until_GC - maximum_desired_capacity;
       // We don't want shrink all the way back to initSize if people call
       // System.gc(), because some programs do that between "phases" and then
       // we'd just have to grow the heap up again for the next phase.  So we
       // damp the shrinking: 0% on the first call, 10% on the second call, 40%
       // on the third call, and 100% by the fourth call.  But if we recompute
       // size without shrinking, it goes back to 0%.
       shrink_bytes = shrink_bytes / 100 * current_shrink_factor;
       shrink_bytes = align_size_down(shrink_bytes, Metaspace::commit_alignment());
       assert(shrink_bytes <= max_shrink_bytes,
         err_msg("invalid shrink size " SIZE_FORMAT " not <= " SIZE_FORMAT,
           shrink_bytes, max_shrink_bytes));
       if (current_shrink_factor == 0) {
         _shrink_factor = 10;
       } else {
         _shrink_factor = MIN2(current_shrink_factor * 4, (uint) 100);
       }
       if (PrintGCDetails && Verbose) {
         gclog_or_tty->print_cr("  "
                       "  shrinking:"
                       "  initSize: %.1fK"
                       "  maximum_desired_capacity: %.1fK",
                       MetaspaceSize / (double) K,
                       maximum_desired_capacity / (double) K);
         gclog_or_tty->print_cr("  "
                       "  shrink_bytes: %.1fK"
                       "  current_shrink_factor: %d"
                       "  new shrink factor: %d"
                       "  MinMetaspaceExpansion: %.1fK",
                       shrink_bytes / (double) K,
                       current_shrink_factor,
                       _shrink_factor,
                       MinMetaspaceExpansion / (double) K);
       }
     }
   }
   // Don't shrink unless it's significant
   if (shrink_bytes >= MinMetaspaceExpansion &&
       ((capacity_until_GC - shrink_bytes) >= MetaspaceSize)) {
     size_t new_capacity_until_GC = MetaspaceGC::dec_capacity_until_GC(shrink_bytes);
     Metaspace::tracer()->report_gc_threshold(capacity_until_GC,
                                              new_capacity_until_GC,
                                              MetaspaceGCThresholdUpdater::ComputeNewSize);
   }
 }
 // Metadebug methods
 void Metadebug::init_allocation_fail_alot_count() {
   if (MetadataAllocationFailALot) {
     _allocation_fail_alot_count =
 +(long)((double)MetadataAllocationFailALotInterval*os::random()/(max_jint+1.0));
   }
 }
 #ifdef ASSERT
 bool Metadebug::test_metadata_failure() {
   if (MetadataAllocationFailALot &&
       Threads::is_vm_complete()) {
     if (_allocation_fail_alot_count > 0) {
       _allocation_fail_alot_count--;
     } else {
       if (TraceMetadataChunkAllocation && Verbose) {
         gclog_or_tty->print_cr("Metadata allocation failing for "
                                "MetadataAllocationFailALot");
       }
       init_allocation_fail_alot_count();
       return true;
     }
   }
   return false;
 }
 #endif
 // ChunkManager methods
 size_t ChunkManager::free_chunks_total_words() {
   return _free_chunks_total;
 }
 size_t ChunkManager::free_chunks_total_bytes() {
   return free_chunks_total_words() * BytesPerWord;
 }
 size_t ChunkManager::free_chunks_count() {
 #ifdef ASSERT
   if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) {
     MutexLockerEx cl(SpaceManager::expand_lock(),
                      Mutex::_no_safepoint_check_flag);
     // This lock is only needed in debug because the verification
     // of the _free_chunks_totals walks the list of free chunks
     slow_locked_verify_free_chunks_count();
   }
 #endif
   return _free_chunks_count;
 }
 void ChunkManager::locked_verify_free_chunks_total() {
   assert_lock_strong(SpaceManager::expand_lock());
   assert(sum_free_chunks() == _free_chunks_total,
     err_msg("_free_chunks_total " SIZE_FORMAT " is not the"
            " same as sum " SIZE_FORMAT, _free_chunks_total,
            sum_free_chunks()));
 }
 void ChunkManager::verify_free_chunks_total() {
   MutexLockerEx cl(SpaceManager::expand_lock(),
                      Mutex::_no_safepoint_check_flag);
   locked_verify_free_chunks_total();
 }
 void ChunkManager::locked_verify_free_chunks_count() {
   assert_lock_strong(SpaceManager::expand_lock());
   assert(sum_free_chunks_count() == _free_chunks_count,
     err_msg("_free_chunks_count " SIZE_FORMAT " is not the"
            " same as sum " SIZE_FORMAT, _free_chunks_count,
            sum_free_chunks_count()));
 }
 void ChunkManager::verify_free_chunks_count() {
 #ifdef ASSERT
   MutexLockerEx cl(SpaceManager::expand_lock(),
                      Mutex::_no_safepoint_check_flag);
   locked_verify_free_chunks_count();
 #endif
 }
 void ChunkManager::verify() {
   MutexLockerEx cl(SpaceManager::expand_lock(),
                      Mutex::_no_safepoint_check_flag);
   locked_verify();
 }
 void ChunkManager::locked_verify() {
   locked_verify_free_chunks_count();
   locked_verify_free_chunks_total();
 }
 void ChunkManager::locked_print_free_chunks(outputStream* st) {
   assert_lock_strong(SpaceManager::expand_lock());
   st->print_cr("Free chunk total " SIZE_FORMAT "  count " SIZE_FORMAT,
                 _free_chunks_total, _free_chunks_count);
 }
 void ChunkManager::locked_print_sum_free_chunks(outputStream* st) {
   assert_lock_strong(SpaceManager::expand_lock());
   st->print_cr("Sum free chunk total " SIZE_FORMAT "  count " SIZE_FORMAT,
                 sum_free_chunks(), sum_free_chunks_count());
 }
 ChunkList* ChunkManager::free_chunks(ChunkIndex index) {
   assert(index == SpecializedIndex || index == SmallIndex || index == MediumIndex,
          err_msg("Bad index: %d", (int)index));
   return &_free_chunks[index];
 }
 // These methods that sum the free chunk lists are used in printing
 // methods that are used in product builds.
 size_t ChunkManager::sum_free_chunks() {
   assert_lock_strong(SpaceManager::expand_lock());
   size_t result = 0;
   for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
     ChunkList* list = free_chunks(i);
     if (list == NULL) {
       continue;
     }
     result = result + list->count() * list->size();
   }
   result = result + humongous_dictionary()->total_size();
   return result;
 }
 size_t ChunkManager::sum_free_chunks_count() {
   assert_lock_strong(SpaceManager::expand_lock());
   size_t count = 0;
   for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
     ChunkList* list = free_chunks(i);
     if (list == NULL) {
       continue;
     }
     count = count + list->count();
   }
   count = count + humongous_dictionary()->total_free_blocks();
   return count;
 }
 ChunkList* ChunkManager::find_free_chunks_list(size_t word_size) {
   ChunkIndex index = list_index(word_size);
   assert(index < HumongousIndex, "No humongous list");
   return free_chunks(index);
 }
 Metachunk* ChunkManager::free_chunks_get(size_t word_size) {
   assert_lock_strong(SpaceManager::expand_lock());
   slow_locked_verify();
   Metachunk* chunk = NULL;
   if (list_index(word_size) != HumongousIndex) {
     ChunkList* free_list = find_free_chunks_list(word_size);
     assert(free_list != NULL, "Sanity check");
     chunk = free_list->head();
     if (chunk == NULL) {
       return NULL;
     }
     // Remove the chunk as the head of the list.
     free_list->remove_chunk(chunk);
     if (TraceMetadataChunkAllocation && Verbose) {
       gclog_or_tty->print_cr("ChunkManager::free_chunks_get: free_list "
                              PTR_FORMAT " head " PTR_FORMAT " size " SIZE_FORMAT,
                              free_list, chunk, chunk->word_size());
     }
   } else {
     chunk = humongous_dictionary()->get_chunk(
       word_size,
       FreeBlockDictionary<Metachunk>::atLeast);
     if (chunk == NULL) {
       return NULL;
     }
     if (TraceMetadataHumongousAllocation) {
       size_t waste = chunk->word_size() - word_size;
       gclog_or_tty->print_cr("Free list allocate humongous chunk size "
                              SIZE_FORMAT " for requested size " SIZE_FORMAT
                              " waste " SIZE_FORMAT,
                              chunk->word_size(), word_size, waste);
     }
   }
   // Chunk is being removed from the chunks free list.
   dec_free_chunks_total(chunk->word_size());
   // Remove it from the links to this freelist
   chunk->set_next(NULL);
   chunk->set_prev(NULL);
 #ifdef ASSERT
   // Chunk is no longer on any freelist. Setting to false make container_count_slow()
   // work.
   chunk->set_is_tagged_free(false);
 #endif
   chunk->container()->inc_container_count();
   slow_locked_verify();
   return chunk;
 }
 Metachunk* ChunkManager::chunk_freelist_allocate(size_t word_size) {
   assert_lock_strong(SpaceManager::expand_lock());
   slow_locked_verify();
   // Take from the beginning of the list
   Metachunk* chunk = free_chunks_get(word_size);
   if (chunk == NULL) {
     return NULL;
   }
   assert((word_size <= chunk->word_size()) ||
          (list_index(chunk->word_size()) == HumongousIndex),
          "Non-humongous variable sized chunk");
   if (TraceMetadataChunkAllocation) {
     size_t list_count;
     if (list_index(word_size) < HumongousIndex) {
       ChunkList* list = find_free_chunks_list(word_size);
       list_count = list->count();
     } else {
       list_count = humongous_dictionary()->total_count();
     }
     gclog_or_tty->print("ChunkManager::chunk_freelist_allocate: " PTR_FORMAT " chunk "
                         PTR_FORMAT "  size " SIZE_FORMAT " count " SIZE_FORMAT " ",
                         this, chunk, chunk->word_size(), list_count);
     locked_print_free_chunks(gclog_or_tty);
   }
   return chunk;
 }
 void ChunkManager::print_on(outputStream* out) const {
   if (PrintFLSStatistics != 0) {
     const_cast<ChunkManager *>(this)->humongous_dictionary()->report_statistics();
   }
 }
 // SpaceManager methods
 size_t SpaceManager::adjust_initial_chunk_size(size_t requested, bool is_class_space) {
   size_t chunk_sizes[] = {
       specialized_chunk_size(is_class_space),
       small_chunk_size(is_class_space),
       medium_chunk_size(is_class_space)
   };
   // Adjust up to one of the fixed chunk sizes ...
   for (size_t i = 0; i < ARRAY_SIZE(chunk_sizes); i++) {
     if (requested <= chunk_sizes[i]) {
       return chunk_sizes[i];
     }
   }
   // ... or return the size as a humongous chunk.
   return requested;
 }
 size_t SpaceManager::adjust_initial_chunk_size(size_t requested) const {
   return adjust_initial_chunk_size(requested, is_class());
 }
 size_t SpaceManager::get_initial_chunk_size(Metaspace::MetaspaceType type) const {
   size_t requested;
   if (is_class()) {
     switch (type) {
     case Metaspace::BootMetaspaceType:       requested = Metaspace::first_class_chunk_word_size(); break;
     case Metaspace::ROMetaspaceType:         requested = ClassSpecializedChunk; break;
     case Metaspace::ReadWriteMetaspaceType:  requested = ClassSpecializedChunk; break;
     case Metaspace::AnonymousMetaspaceType:  requested = ClassSpecializedChunk; break;
     case Metaspace::ReflectionMetaspaceType: requested = ClassSpecializedChunk; break;
     default:                                 requested = ClassSmallChunk; break;
     }
   } else {
     switch (type) {
     case Metaspace::BootMetaspaceType:       requested = Metaspace::first_chunk_word_size(); break;
     case Metaspace::ROMetaspaceType:         requested = SharedReadOnlySize / wordSize; break;
     case Metaspace::ReadWriteMetaspaceType:  requested = SharedReadWriteSize / wordSize; break;
     case Metaspace::AnonymousMetaspaceType:  requested = SpecializedChunk; break;
     case Metaspace::ReflectionMetaspaceType: requested = SpecializedChunk; break;
     default:                                 requested = SmallChunk; break;
     }
   }
   // Adjust to one of the fixed chunk sizes (unless humongous)
   const size_t adjusted = adjust_initial_chunk_size(requested);
   assert(adjusted != 0, err_msg("Incorrect initial chunk size. Requested: "
          SIZE_FORMAT " adjusted: " SIZE_FORMAT, requested, adjusted));
   return adjusted;
 }
 size_t SpaceManager::sum_free_in_chunks_in_use() const {
   MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
   size_t free = 0;
   for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
     Metachunk* chunk = chunks_in_use(i);
     while (chunk != NULL) {
       free += chunk->free_word_size();
       chunk = chunk->next();
     }
   }
   return free;
 }
 size_t SpaceManager::sum_waste_in_chunks_in_use() const {
   MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
   size_t result = 0;
   for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
    result += sum_waste_in_chunks_in_use(i);
   }
   return result;
 }
 size_t SpaceManager::sum_waste_in_chunks_in_use(ChunkIndex index) const {
   size_t result = 0;
   Metachunk* chunk = chunks_in_use(index);
   // Count the free space in all the chunk but not the
   // current chunk from which allocations are still being done.
   while (chunk != NULL) {
     if (chunk != current_chunk()) {
       result += chunk->free_word_size();
     }
     chunk = chunk->next();
   }
   return result;
 }
 size_t SpaceManager::sum_capacity_in_chunks_in_use() const {
   // For CMS use "allocated_chunks_words()" which does not need the
   // Metaspace lock.  For the other collectors sum over the
   // lists.  Use both methods as a check that "allocated_chunks_words()"
   // is correct.  That is, sum_capacity_in_chunks() is too expensive
   // to use in the product and allocated_chunks_words() should be used
   // but allow for  checking that allocated_chunks_words() returns the same
   // value as sum_capacity_in_chunks_in_use() which is the definitive
   // answer.
   if (UseConcMarkSweepGC) {
     return allocated_chunks_words();
   } else {
     MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
     size_t sum = 0;
     for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
       Metachunk* chunk = chunks_in_use(i);
       while (chunk != NULL) {
         sum += chunk->word_size();
         chunk = chunk->next();
       }
     }
   return sum;
   }
 }
 size_t SpaceManager::sum_count_in_chunks_in_use() {
   size_t count = 0;
   for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
     count = count + sum_count_in_chunks_in_use(i);
   }
   return count;
 }
 size_t SpaceManager::sum_count_in_chunks_in_use(ChunkIndex i) {
   size_t count = 0;
   Metachunk* chunk = chunks_in_use(i);
   while (chunk != NULL) {
     count++;
     chunk = chunk->next();
   }
   return count;
 }
 size_t SpaceManager::sum_used_in_chunks_in_use() const {
   MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
   size_t used = 0;
   for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
     Metachunk* chunk = chunks_in_use(i);
     while (chunk != NULL) {
       used += chunk->used_word_size();
       chunk = chunk->next();
     }
   }
   return used;
 }
 void SpaceManager::locked_print_chunks_in_use_on(outputStream* st) const {
   for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
     Metachunk* chunk = chunks_in_use(i);
     st->print("SpaceManager: %s " PTR_FORMAT,
                  chunk_size_name(i), chunk);
     if (chunk != NULL) {
       st->print_cr(" free " SIZE_FORMAT,
                    chunk->free_word_size());
     } else {
       st->cr();
     }
   }
   chunk_manager()->locked_print_free_chunks(st);
   chunk_manager()->locked_print_sum_free_chunks(st);
 }
 size_t SpaceManager::calc_chunk_size(size_t word_size) {
   // Decide between a small chunk and a medium chunk.  Up to
   // _small_chunk_limit small chunks can be allocated but
   // once a medium chunk has been allocated, no more small
   // chunks will be allocated.
   size_t chunk_word_size;
   if (chunks_in_use(MediumIndex) == NULL &&
       sum_count_in_chunks_in_use(SmallIndex) < _small_chunk_limit) {
     chunk_word_size = (size_t) small_chunk_size();
     if (word_size + Metachunk::overhead() > small_chunk_size()) {
       chunk_word_size = medium_chunk_size();
     }
   } else {
     chunk_word_size = medium_chunk_size();
   }
   // Might still need a humongous chunk.  Enforce
   // humongous allocations sizes to be aligned up to
   // the smallest chunk size.
   size_t if_humongous_sized_chunk =
     align_size_up(word_size + Metachunk::overhead(),
                   smallest_chunk_size());
   chunk_word_size =
     MAX2((size_t) chunk_word_size, if_humongous_sized_chunk);
   assert(!SpaceManager::is_humongous(word_size) ||
          chunk_word_size == if_humongous_sized_chunk,
          err_msg("Size calculation is wrong, word_size " SIZE_FORMAT
                  " chunk_word_size " SIZE_FORMAT,
                  word_size, chunk_word_size));
   if (TraceMetadataHumongousAllocation &&
       SpaceManager::is_humongous(word_size)) {
     gclog_or_tty->print_cr("Metadata humongous allocation:");
     gclog_or_tty->print_cr("  word_size " PTR_FORMAT, word_size);
     gclog_or_tty->print_cr("  chunk_word_size " PTR_FORMAT,
                            chunk_word_size);
     gclog_or_tty->print_cr("    chunk overhead " PTR_FORMAT,
                            Metachunk::overhead());
   }
   return chunk_word_size;
 }
 void SpaceManager::track_metaspace_memory_usage() {
   if (is_init_completed()) {
     if (is_class()) {
       MemoryService::track_compressed_class_memory_usage();
     }
     MemoryService::track_metaspace_memory_usage();
   }
 }
 MetaWord* SpaceManager::grow_and_allocate(size_t word_size) {
   assert(vs_list()->current_virtual_space() != NULL,
          "Should have been set");
   assert(current_chunk() == NULL ||
          current_chunk()->allocate(word_size) == NULL,
          "Don't need to expand");
   MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
   if (TraceMetadataChunkAllocation && Verbose) {
     size_t words_left = 0;
     size_t words_used = 0;
     if (current_chunk() != NULL) {
       words_left = current_chunk()->free_word_size();
       words_used = current_chunk()->used_word_size();
     }
     gclog_or_tty->print_cr("SpaceManager::grow_and_allocate for " SIZE_FORMAT
                            " words " SIZE_FORMAT " words used " SIZE_FORMAT
                            " words left",
                             word_size, words_used, words_left);
   }
   // Get another chunk out of the virtual space
   size_t chunk_word_size = calc_chunk_size(word_size);
   Metachunk* next = get_new_chunk(chunk_word_size);
   MetaWord* mem = NULL;
   // If a chunk was available, add it to the in-use chunk list
   // and do an allocation from it.
   if (next != NULL) {
     // Add to this manager's list of chunks in use.
     add_chunk(next, false);
     mem = next->allocate(word_size);
   }
   // Track metaspace memory usage statistic.
   track_metaspace_memory_usage();
   return mem;
 }
 void SpaceManager::print_on(outputStream* st) const {
   for (ChunkIndex i = ZeroIndex;
        i < NumberOfInUseLists ;
        i = next_chunk_index(i) ) {
     st->print_cr("  chunks_in_use " PTR_FORMAT " chunk size " PTR_FORMAT,
                  chunks_in_use(i),
                  chunks_in_use(i) == NULL ? 0 : chunks_in_use(i)->word_size());
   }
   st->print_cr("    waste:  Small " SIZE_FORMAT " Medium " SIZE_FORMAT
                " Humongous " SIZE_FORMAT,
                sum_waste_in_chunks_in_use(SmallIndex),
                sum_waste_in_chunks_in_use(MediumIndex),
                sum_waste_in_chunks_in_use(HumongousIndex));
   // block free lists
   if (block_freelists() != NULL) {
     st->print_cr("total in block free lists " SIZE_FORMAT,
       block_freelists()->total_size());
   }
 }
 SpaceManager::SpaceManager(Metaspace::MetadataType mdtype,
                            Mutex* lock) :
   _mdtype(mdtype),
   _allocated_blocks_words(0),
   _allocated_chunks_words(0),
   _allocated_chunks_count(0),
   _lock(lock)
 {
   initialize();
 }
 void SpaceManager::inc_size_metrics(size_t words) {
   assert_lock_strong(SpaceManager::expand_lock());
   // Total of allocated Metachunks and allocated Metachunks count
   // for each SpaceManager
   _allocated_chunks_words = _allocated_chunks_words + words;
   _allocated_chunks_count++;
   // Global total of capacity in allocated Metachunks
   MetaspaceAux::inc_capacity(mdtype(), words);
   // Global total of allocated Metablocks.
   // used_words_slow() includes the overhead in each
   // Metachunk so include it in the used when the
   // Metachunk is first added (so only added once per
   // Metachunk).
   MetaspaceAux::inc_used(mdtype(), Metachunk::overhead());
 }
 void SpaceManager::inc_used_metrics(size_t words) {
   // Add to the per SpaceManager total
   Atomic::add_ptr(words, &_allocated_blocks_words);
   // Add to the global total
   MetaspaceAux::inc_used(mdtype(), words);
 }
 void SpaceManager::dec_total_from_size_metrics() {
   MetaspaceAux::dec_capacity(mdtype(), allocated_chunks_words());
   MetaspaceAux::dec_used(mdtype(), allocated_blocks_words());
   // Also deduct the overhead per Metachunk
   MetaspaceAux::dec_used(mdtype(), allocated_chunks_count() * Metachunk::overhead());
 }
 void SpaceManager::initialize() {
   Metadebug::init_allocation_fail_alot_count();
   for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
     _chunks_in_use[i] = NULL;
   }
   _current_chunk = NULL;
   if (TraceMetadataChunkAllocation && Verbose) {
     gclog_or_tty->print_cr("SpaceManager(): " PTR_FORMAT, this);
   }
 }
 void ChunkManager::return_chunks(ChunkIndex index, Metachunk* chunks) {
   if (chunks == NULL) {
     return;
   }
   ChunkList* list = free_chunks(index);
   assert(list->size() == chunks->word_size(), "Mismatch in chunk sizes");
   assert_lock_strong(SpaceManager::expand_lock());
   Metachunk* cur = chunks;
   // This returns chunks one at a time.  If a new
   // class List can be created that is a base class
   // of FreeList then something like FreeList::prepend()
   // can be used in place of this loop
   while (cur != NULL) {
     assert(cur->container() != NULL, "Container should have been set");
     cur->container()->dec_container_count();
     // Capture the next link before it is changed
     // by the call to return_chunk_at_head();
     Metachunk* next = cur->next();
     DEBUG_ONLY(cur->set_is_tagged_free(true);)
     list->return_chunk_at_head(cur);
     cur = next;
   }
 }
 SpaceManager::~SpaceManager() {
   // This call this->_lock which can't be done while holding expand_lock()
   assert(sum_capacity_in_chunks_in_use() == allocated_chunks_words(),
     err_msg("sum_capacity_in_chunks_in_use() " SIZE_FORMAT
             " allocated_chunks_words() " SIZE_FORMAT,
             sum_capacity_in_chunks_in_use(), allocated_chunks_words()));
   MutexLockerEx fcl(SpaceManager::expand_lock(),
                     Mutex::_no_safepoint_check_flag);
   chunk_manager()->slow_locked_verify();
   dec_total_from_size_metrics();
   if (TraceMetadataChunkAllocation && Verbose) {
     gclog_or_tty->print_cr("~SpaceManager(): " PTR_FORMAT, this);
     locked_print_chunks_in_use_on(gclog_or_tty);
   }
   // Do not mangle freed Metachunks.  The chunk size inside Metachunks
   // is during the freeing of a VirtualSpaceNodes.
   // Have to update before the chunks_in_use lists are emptied
   // below.
   chunk_manager()->inc_free_chunks_total(allocated_chunks_words(),
                                          sum_count_in_chunks_in_use());
   // Add all the chunks in use by this space manager
   // to the global list of free chunks.
   // Follow each list of chunks-in-use and add them to the
   // free lists.  Each list is NULL terminated.
   for (ChunkIndex i = ZeroIndex; i < HumongousIndex; i = next_chunk_index(i)) {
     if (TraceMetadataChunkAllocation && Verbose) {
       gclog_or_tty->print_cr("returned %d %s chunks to freelist",
                              sum_count_in_chunks_in_use(i),
                              chunk_size_name(i));
     }
     Metachunk* chunks = chunks_in_use(i);
     chunk_manager()->return_chunks(i, chunks);
     set_chunks_in_use(i, NULL);
     if (TraceMetadataChunkAllocation && Verbose) {
       gclog_or_tty->print_cr("updated freelist count %d %s",
                              chunk_manager()->free_chunks(i)->count(),
                              chunk_size_name(i));
     }
     assert(i != HumongousIndex, "Humongous chunks are handled explicitly later");
   }
   // The medium chunk case may be optimized by passing the head and
   // tail of the medium chunk list to add_at_head().  The tail is often
   // the current chunk but there are probably exceptions.
   // Humongous chunks
   if (TraceMetadataChunkAllocation && Verbose) {
     gclog_or_tty->print_cr("returned %d %s humongous chunks to dictionary",
                             sum_count_in_chunks_in_use(HumongousIndex),
                             chunk_size_name(HumongousIndex));
     gclog_or_tty->print("Humongous chunk dictionary: ");
   }
   // Humongous chunks are never the current chunk.
   Metachunk* humongous_chunks = chunks_in_use(HumongousIndex);
   while (humongous_chunks != NULL) {
 #ifdef ASSERT
     humongous_chunks->set_is_tagged_free(true);
 #endif
     if (TraceMetadataChunkAllocation && Verbose) {
       gclog_or_tty->print(PTR_FORMAT " (" SIZE_FORMAT ") ",
                           humongous_chunks,
                           humongous_chunks->word_size());
     }
     assert(humongous_chunks->word_size() == (size_t)
            align_size_up(humongous_chunks->word_size(),
                              smallest_chunk_size()),
            err_msg("Humongous chunk size is wrong: word size " SIZE_FORMAT
                    " granularity %d",
                    humongous_chunks->word_size(), smallest_chunk_size()));
     Metachunk* next_humongous_chunks = humongous_chunks->next();
     humongous_chunks->container()->dec_container_count();
     chunk_manager()->humongous_dictionary()->return_chunk(humongous_chunks);
     humongous_chunks = next_humongous_chunks;
   }
   if (TraceMetadataChunkAllocation && Verbose) {
     gclog_or_tty->cr();
     gclog_or_tty->print_cr("updated dictionary count %d %s",
                      chunk_manager()->humongous_dictionary()->total_count(),
                      chunk_size_name(HumongousIndex));
   }
   chunk_manager()->slow_locked_verify();
 }
 const char* SpaceManager::chunk_size_name(ChunkIndex index) const {
   switch (index) {
     case SpecializedIndex:
       return "Specialized";
     case SmallIndex:
       return "Small";
     case MediumIndex:
       return "Medium";
     case HumongousIndex:
       return "Humongous";
     default:
       return NULL;
   }
 }
 ChunkIndex ChunkManager::list_index(size_t size) {
   if (free_chunks(SpecializedIndex)->size() == size) {
     return SpecializedIndex;
   }
   if (free_chunks(SmallIndex)->size() == size) {
     return SmallIndex;
   }
   if (free_chunks(MediumIndex)->size() == size) {
     return MediumIndex;
   }
   assert(size > free_chunks(MediumIndex)->size(), "Not a humongous chunk");
   return HumongousIndex;
 }
 void SpaceManager::deallocate(MetaWord* p, size_t word_size) {
   assert_lock_strong(_lock);
   size_t raw_word_size = get_raw_word_size(word_size);
   size_t min_size = TreeChunk<Metablock, FreeList<Metablock> >::min_size();
   assert(raw_word_size >= min_size,
          err_msg("Should not deallocate dark matter " SIZE_FORMAT "<" SIZE_FORMAT, word_size, min_size));
   block_freelists()->return_block(p, raw_word_size);
 }
 // Adds a chunk to the list of chunks in use.
 void SpaceManager::add_chunk(Metachunk* new_chunk, bool make_current) {
   assert(new_chunk != NULL, "Should not be NULL");
   assert(new_chunk->next() == NULL, "Should not be on a list");
   new_chunk->reset_empty();
   // Find the correct list and and set the current
   // chunk for that list.
   ChunkIndex index = chunk_manager()->list_index(new_chunk->word_size());
   if (index != HumongousIndex) {
     retire_current_chunk();
     set_current_chunk(new_chunk);
     new_chunk->set_next(chunks_in_use(index));
     set_chunks_in_use(index, new_chunk);
   } else {
     // For null class loader data and DumpSharedSpaces, the first chunk isn't
     // small, so small will be null.  Link this first chunk as the current
     // chunk.
     if (make_current) {
       // Set as the current chunk but otherwise treat as a humongous chunk.
       set_current_chunk(new_chunk);
     }
     // Link at head.  The _current_chunk only points to a humongous chunk for
     // the null class loader metaspace (class and data virtual space managers)
     // any humongous chunks so will not point to the tail
     // of the humongous chunks list.
     new_chunk->set_next(chunks_in_use(HumongousIndex));
     set_chunks_in_use(HumongousIndex, new_chunk);
     assert(new_chunk->word_size() > medium_chunk_size(), "List inconsistency");
   }
   // Add to the running sum of capacity
   inc_size_metrics(new_chunk->word_size());
   assert(new_chunk->is_empty(), "Not ready for reuse");
   if (TraceMetadataChunkAllocation && Verbose) {
     gclog_or_tty->print("SpaceManager::add_chunk: %d) ",
                         sum_count_in_chunks_in_use());
     new_chunk->print_on(gclog_or_tty);
     chunk_manager()->locked_print_free_chunks(gclog_or_tty);
   }
 }
 void SpaceManager::retire_current_chunk() {
   if (current_chunk() != NULL) {
     size_t remaining_words = current_chunk()->free_word_size();
     if (remaining_words >= TreeChunk<Metablock, FreeList<Metablock> >::min_size()) {
       block_freelists()->return_block(current_chunk()->allocate(remaining_words), remaining_words);
       inc_used_metrics(remaining_words);
     }
   }
 }
 Metachunk* SpaceManager::get_new_chunk(size_t chunk_word_size) {
   // Get a chunk from the chunk freelist
   Metachunk* next = chunk_manager()->chunk_freelist_allocate(chunk_word_size);
   if (next == NULL) {
     next = vs_list()->get_new_chunk(chunk_word_size,
                                     medium_chunk_bunch());
   }
   if (TraceMetadataHumongousAllocation && next != NULL &&
       SpaceManager::is_humongous(next->word_size())) {
     gclog_or_tty->print_cr("  new humongous chunk word size "
                            PTR_FORMAT, next->word_size());
   }
   return next;
 }
 MetaWord* SpaceManager::allocate(size_t word_size) {
   MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
   size_t raw_word_size = get_raw_word_size(word_size);
   BlockFreelist* fl =  block_freelists();
   MetaWord* p = NULL;
   // Allocation from the dictionary is expensive in the sense that
   // the dictionary has to be searched for a size.  Don't allocate
   // from the dictionary until it starts to get fat.  Is this
   // a reasonable policy?  Maybe an skinny dictionary is fast enough
   // for allocations.  Do some profiling.  JJJ
   if (fl->total_size() > allocation_from_dictionary_limit) {
     p = fl->get_block(raw_word_size);
   }
   if (p == NULL) {
     p = allocate_work(raw_word_size);
   }
   return p;
 }
 // Returns the address of spaced allocated for "word_size".
 // This methods does not know about blocks (Metablocks)
 MetaWord* SpaceManager::allocate_work(size_t word_size) {
   assert_lock_strong(_lock);
 #ifdef ASSERT
   if (Metadebug::test_metadata_failure()) {
     return NULL;
   }
 #endif
   // Is there space in the current chunk?
   MetaWord* result = NULL;
   // For DumpSharedSpaces, only allocate out of the current chunk which is
   // never null because we gave it the size we wanted.   Caller reports out
   // of memory if this returns null.
   if (DumpSharedSpaces) {
     assert(current_chunk() != NULL, "should never happen");
     inc_used_metrics(word_size);
     return current_chunk()->allocate(word_size); // caller handles null result
   }
   if (current_chunk() != NULL) {
     result = current_chunk()->allocate(word_size);
   }
   if (result == NULL) {
     result = grow_and_allocate(word_size);
   }
   if (result != NULL) {
     inc_used_metrics(word_size);
     assert(result != (MetaWord*) chunks_in_use(MediumIndex),
            "Head of the list is being allocated");
   }
   return result;
 }
 void SpaceManager::verify() {
   // If there are blocks in the dictionary, then
   // verfication of chunks does not work since
   // being in the dictionary alters a chunk.
   if (block_freelists()->total_size() == 0) {
     for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
       Metachunk* curr = chunks_in_use(i);
       while (curr != NULL) {
         curr->verify();
         verify_chunk_size(curr);
         curr = curr->next();
       }
     }
   }
 }
 void SpaceManager::verify_chunk_size(Metachunk* chunk) {
   assert(is_humongous(chunk->word_size()) ||
          chunk->word_size() == medium_chunk_size() ||
          chunk->word_size() == small_chunk_size() ||
          chunk->word_size() == specialized_chunk_size(),
          "Chunk size is wrong");
   return;
 }
 #ifdef ASSERT
 void SpaceManager::verify_allocated_blocks_words() {
   // Verification is only guaranteed at a safepoint.
   assert(SafepointSynchronize::is_at_safepoint() || !Universe::is_fully_initialized(),
     "Verification can fail if the applications is running");
   assert(allocated_blocks_words() == sum_used_in_chunks_in_use(),
     err_msg("allocation total is not consistent " SIZE_FORMAT
             " vs " SIZE_FORMAT,
             allocated_blocks_words(), sum_used_in_chunks_in_use()));
 }
 #endif
 void SpaceManager::dump(outputStream* const out) const {
   size_t curr_total = 0;
   size_t waste = 0;
   uint i = 0;
   size_t used = 0;
   size_t capacity = 0;
   // Add up statistics for all chunks in this SpaceManager.
   for (ChunkIndex index = ZeroIndex;
        index < NumberOfInUseLists;
        index = next_chunk_index(index)) {
     for (Metachunk* curr = chunks_in_use(index);
          curr != NULL;
          curr = curr->next()) {
       out->print("%d) ", i++);
       curr->print_on(out);
       curr_total += curr->word_size();
       used += curr->used_word_size();
       capacity += curr->word_size();
       waste += curr->free_word_size() + curr->overhead();;
     }
   }
   if (TraceMetadataChunkAllocation && Verbose) {
     block_freelists()->print_on(out);
   }
   size_t free = current_chunk() == NULL ? 0 : current_chunk()->free_word_size();
   // Free space isn't wasted.
   waste -= free;
   out->print_cr("total of all chunks "  SIZE_FORMAT " used " SIZE_FORMAT
                 " free " SIZE_FORMAT " capacity " SIZE_FORMAT
                 " waste " SIZE_FORMAT, curr_total, used, free, capacity, waste);
 }
 #ifndef PRODUCT
 void SpaceManager::mangle_freed_chunks() {
   for (ChunkIndex index = ZeroIndex;
        index < NumberOfInUseLists;
        index = next_chunk_index(index)) {
     for (Metachunk* curr = chunks_in_use(index);
          curr != NULL;
          curr = curr->next()) {
       curr->mangle();
     }
   }
 }
 #endif // PRODUCT
 // MetaspaceAux
 size_t MetaspaceAux::_capacity_words[] = {0, 0};
 size_t MetaspaceAux::_used_words[] = {0, 0};
 size_t MetaspaceAux::free_bytes(Metaspace::MetadataType mdtype) {
   VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
   return list == NULL ? 0 : list->free_bytes();
 }
 size_t MetaspaceAux::free_bytes() {
   return free_bytes(Metaspace::ClassType) + free_bytes(Metaspace::NonClassType);
 }
 void MetaspaceAux::dec_capacity(Metaspace::MetadataType mdtype, size_t words) {
   assert_lock_strong(SpaceManager::expand_lock());
   assert(words <= capacity_words(mdtype),
     err_msg("About to decrement below 0: words " SIZE_FORMAT
             " is greater than _capacity_words[%u] " SIZE_FORMAT,
             words, mdtype, capacity_words(mdtype)));
   _capacity_words[mdtype] -= words;
 }
 void MetaspaceAux::inc_capacity(Metaspace::MetadataType mdtype, size_t words) {
   assert_lock_strong(SpaceManager::expand_lock());
   // Needs to be atomic
   _capacity_words[mdtype] += words;
 }
 void MetaspaceAux::dec_used(Metaspace::MetadataType mdtype, size_t words) {
   assert(words <= used_words(mdtype),
     err_msg("About to decrement below 0: words " SIZE_FORMAT
             " is greater than _used_words[%u] " SIZE_FORMAT,
             words, mdtype, used_words(mdtype)));
   // For CMS deallocation of the Metaspaces occurs during the
   // sweep which is a concurrent phase.  Protection by the expand_lock()
   // is not enough since allocation is on a per Metaspace basis
   // and protected by the Metaspace lock.
   jlong minus_words = (jlong) - (jlong) words;
   Atomic::add_ptr(minus_words, &_used_words[mdtype]);
 }
 void MetaspaceAux::inc_used(Metaspace::MetadataType mdtype, size_t words) {
   // _used_words tracks allocations for
   // each piece of metadata.  Those allocations are
   // generally done concurrently by different application
   // threads so must be done atomically.
   Atomic::add_ptr(words, &_used_words[mdtype]);
 }
 size_t MetaspaceAux::used_bytes_slow(Metaspace::MetadataType mdtype) {
   size_t used = 0;
   ClassLoaderDataGraphMetaspaceIterator iter;
   while (iter.repeat()) {
     Metaspace* msp = iter.get_next();
     // Sum allocated_blocks_words for each metaspace
     if (msp != NULL) {
       used += msp->used_words_slow(mdtype);
     }
   }
   return used * BytesPerWord;
 }
 size_t MetaspaceAux::free_bytes_slow(Metaspace::MetadataType mdtype) {
   size_t free = 0;
   ClassLoaderDataGraphMetaspaceIterator iter;
   while (iter.repeat()) {
     Metaspace* msp = iter.get_next();
     if (msp != NULL) {
       free += msp->free_words_slow(mdtype);
     }
   }
   return free * BytesPerWord;
 }
 size_t MetaspaceAux::capacity_bytes_slow(Metaspace::MetadataType mdtype) {
   if ((mdtype == Metaspace::ClassType) && !Metaspace::using_class_space()) {
     return 0;
   }
   // Don't count the space in the freelists.  That space will be
   // added to the capacity calculation as needed.
   size_t capacity = 0;
   ClassLoaderDataGraphMetaspaceIterator iter;
   while (iter.repeat()) {
     Metaspace* msp = iter.get_next();
     if (msp != NULL) {
       capacity += msp->capacity_words_slow(mdtype);
     }
   }
   return capacity * BytesPerWord;
 }
 size_t MetaspaceAux::capacity_bytes_slow() {
 #ifdef PRODUCT
   // Use capacity_bytes() in PRODUCT instead of this function.
   guarantee(false, "Should not call capacity_bytes_slow() in the PRODUCT");
 #endif
   size_t class_capacity = capacity_bytes_slow(Metaspace::ClassType);
   size_t non_class_capacity = capacity_bytes_slow(Metaspace::NonClassType);
   assert(capacity_bytes() == class_capacity + non_class_capacity,
       err_msg("bad accounting: capacity_bytes() " SIZE_FORMAT
         " class_capacity + non_class_capacity " SIZE_FORMAT
         " class_capacity " SIZE_FORMAT " non_class_capacity " SIZE_FORMAT,
         capacity_bytes(), class_capacity + non_class_capacity,
         class_capacity, non_class_capacity));
   return class_capacity + non_class_capacity;
 }
 size_t MetaspaceAux::reserved_bytes(Metaspace::MetadataType mdtype) {
   VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
   return list == NULL ? 0 : list->reserved_bytes();
 }
 size_t MetaspaceAux::committed_bytes(Metaspace::MetadataType mdtype) {
   VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
   return list == NULL ? 0 : list->committed_bytes();
 }
 size_t MetaspaceAux::min_chunk_size_words() { return Metaspace::first_chunk_word_size(); }
 size_t MetaspaceAux::free_chunks_total_words(Metaspace::MetadataType mdtype) {
   ChunkManager* chunk_manager = Metaspace::get_chunk_manager(mdtype);
   if (chunk_manager == NULL) {
     return 0;
   }
   chunk_manager->slow_verify();
   return chunk_manager->free_chunks_total_words();
 }
 size_t MetaspaceAux::free_chunks_total_bytes(Metaspace::MetadataType mdtype) {
   return free_chunks_total_words(mdtype) * BytesPerWord;
 }
 size_t MetaspaceAux::free_chunks_total_words() {
   return free_chunks_total_words(Metaspace::ClassType) +
          free_chunks_total_words(Metaspace::NonClassType);
 }
 size_t MetaspaceAux::free_chunks_total_bytes() {
   return free_chunks_total_words() * BytesPerWord;
 }
 bool MetaspaceAux::has_chunk_free_list(Metaspace::MetadataType mdtype) {
   return Metaspace::get_chunk_manager(mdtype) != NULL;
 }
 MetaspaceChunkFreeListSummary MetaspaceAux::chunk_free_list_summary(Metaspace::MetadataType mdtype) {
   if (!has_chunk_free_list(mdtype)) {
     return MetaspaceChunkFreeListSummary();
   }
   const ChunkManager* cm = Metaspace::get_chunk_manager(mdtype);
   return cm->chunk_free_list_summary();
 }
 void MetaspaceAux::print_metaspace_change(size_t prev_metadata_used) {
   gclog_or_tty->print(", [Metaspace:");
   if (PrintGCDetails && Verbose) {
     gclog_or_tty->print(" "  SIZE_FORMAT
                         "->" SIZE_FORMAT
                         "("  SIZE_FORMAT ")",
                         prev_metadata_used,
                         used_bytes(),
                         reserved_bytes());
   } else {
     gclog_or_tty->print(" "  SIZE_FORMAT "K"
                         "->" SIZE_FORMAT "K"
                         "("  SIZE_FORMAT "K)",
                         prev_metadata_used/K,
                         used_bytes()/K,
                         reserved_bytes()/K);
   }
   gclog_or_tty->print("]");
 }
 // This is printed when PrintGCDetails
 void MetaspaceAux::print_on(outputStream* out) {
   Metaspace::MetadataType nct = Metaspace::NonClassType;
   out->print_cr(" Metaspace       "
                 "used "      SIZE_FORMAT "K, "
                 "capacity "  SIZE_FORMAT "K, "
                 "committed " SIZE_FORMAT "K, "
                 "reserved "  SIZE_FORMAT "K",
                 used_bytes()/K,
                 capacity_bytes()/K,
                 committed_bytes()/K,
                 reserved_bytes()/K);
   if (Metaspace::using_class_space()) {
     Metaspace::MetadataType ct = Metaspace::ClassType;
     out->print_cr("  class space    "
                   "used "      SIZE_FORMAT "K, "
                   "capacity "  SIZE_FORMAT "K, "
                   "committed " SIZE_FORMAT "K, "
                   "reserved "  SIZE_FORMAT "K",
                   used_bytes(ct)/K,
                   capacity_bytes(ct)/K,
                   committed_bytes(ct)/K,
                   reserved_bytes(ct)/K);
   }
 }
 // Print information for class space and data space separately.
 // This is almost the same as above.
 void MetaspaceAux::print_on(outputStream* out, Metaspace::MetadataType mdtype) {
   size_t free_chunks_capacity_bytes = free_chunks_total_bytes(mdtype);
   size_t capacity_bytes = capacity_bytes_slow(mdtype);
   size_t used_bytes = used_bytes_slow(mdtype);
   size_t free_bytes = free_bytes_slow(mdtype);
   size_t used_and_free = used_bytes + free_bytes +
                            free_chunks_capacity_bytes;
   out->print_cr("  Chunk accounting: used in chunks " SIZE_FORMAT
              "K + unused in chunks " SIZE_FORMAT "K  + "
              " capacity in free chunks " SIZE_FORMAT "K = " SIZE_FORMAT
              "K  capacity in allocated chunks " SIZE_FORMAT "K",
              used_bytes / K,
              free_bytes / K,
              free_chunks_capacity_bytes / K,
              used_and_free / K,
              capacity_bytes / K);
   // Accounting can only be correct if we got the values during a safepoint
   assert(!SafepointSynchronize::is_at_safepoint() || used_and_free == capacity_bytes, "Accounting is wrong");
 }
 // Print total fragmentation for class metaspaces
 void MetaspaceAux::print_class_waste(outputStream* out) {
   assert(Metaspace::using_class_space(), "class metaspace not used");
   size_t cls_specialized_waste = 0, cls_small_waste = 0, cls_medium_waste = 0;
   size_t cls_specialized_count = 0, cls_small_count = 0, cls_medium_count = 0, cls_humongous_count = 0;
   ClassLoaderDataGraphMetaspaceIterator iter;
   while (iter.repeat()) {
     Metaspace* msp = iter.get_next();
     if (msp != NULL) {
       cls_specialized_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SpecializedIndex);
       cls_specialized_count += msp->class_vsm()->sum_count_in_chunks_in_use(SpecializedIndex);
       cls_small_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SmallIndex);
       cls_small_count += msp->class_vsm()->sum_count_in_chunks_in_use(SmallIndex);
       cls_medium_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(MediumIndex);
       cls_medium_count += msp->class_vsm()->sum_count_in_chunks_in_use(MediumIndex);
       cls_humongous_count += msp->class_vsm()->sum_count_in_chunks_in_use(HumongousIndex);
     }
   }
   out->print_cr(" class: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", "
                 SIZE_FORMAT " small(s) " SIZE_FORMAT ", "
                 SIZE_FORMAT " medium(s) " SIZE_FORMAT ", "
                 "large count " SIZE_FORMAT,
                 cls_specialized_count, cls_specialized_waste,
                 cls_small_count, cls_small_waste,
                 cls_medium_count, cls_medium_waste, cls_humongous_count);
 }
 // Print total fragmentation for data and class metaspaces separately
 void MetaspaceAux::print_waste(outputStream* out) {
   size_t specialized_waste = 0, small_waste = 0, medium_waste = 0;
   size_t specialized_count = 0, small_count = 0, medium_count = 0, humongous_count = 0;
   ClassLoaderDataGraphMetaspaceIterator iter;
   while (iter.repeat()) {
     Metaspace* msp = iter.get_next();
     if (msp != NULL) {
       specialized_waste += msp->vsm()->sum_waste_in_chunks_in_use(SpecializedIndex);
       specialized_count += msp->vsm()->sum_count_in_chunks_in_use(SpecializedIndex);
       small_waste += msp->vsm()->sum_waste_in_chunks_in_use(SmallIndex);
       small_count += msp->vsm()->sum_count_in_chunks_in_use(SmallIndex);
       medium_waste += msp->vsm()->sum_waste_in_chunks_in_use(MediumIndex);
       medium_count += msp->vsm()->sum_count_in_chunks_in_use(MediumIndex);
       humongous_count += msp->vsm()->sum_count_in_chunks_in_use(HumongousIndex);
     }
   }
   out->print_cr("Total fragmentation waste (words) doesn't count free space");
   out->print_cr("  data: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", "
                         SIZE_FORMAT " small(s) " SIZE_FORMAT ", "
                         SIZE_FORMAT " medium(s) " SIZE_FORMAT ", "
                         "large count " SIZE_FORMAT,
              specialized_count, specialized_waste, small_count,
              small_waste, medium_count, medium_waste, humongous_count);
   if (Metaspace::using_class_space()) {
     print_class_waste(out);
   }
 }
 // Dump global metaspace things from the end of ClassLoaderDataGraph
 void MetaspaceAux::dump(outputStream* out) {
   out->print_cr("All Metaspace:");
   out->print("data space: "); print_on(out, Metaspace::NonClassType);
   out->print("class space: "); print_on(out, Metaspace::ClassType);
   print_waste(out);
 }
 void MetaspaceAux::verify_free_chunks() {
   Metaspace::chunk_manager_metadata()->verify();
   if (Metaspace::using_class_space()) {
     Metaspace::chunk_manager_class()->verify();
   }
 }
 void MetaspaceAux::verify_capacity() {
 #ifdef ASSERT
   size_t running_sum_capacity_bytes = capacity_bytes();
   // For purposes of the running sum of capacity, verify against capacity
   size_t capacity_in_use_bytes = capacity_bytes_slow();
   assert(running_sum_capacity_bytes == capacity_in_use_bytes,
     err_msg("capacity_words() * BytesPerWord " SIZE_FORMAT
             " capacity_bytes_slow()" SIZE_FORMAT,
             running_sum_capacity_bytes, capacity_in_use_bytes));
   for (Metaspace::MetadataType i = Metaspace::ClassType;
        i < Metaspace:: MetadataTypeCount;
        i = (Metaspace::MetadataType)(i + 1)) {
     size_t capacity_in_use_bytes = capacity_bytes_slow(i);
     assert(capacity_bytes(i) == capacity_in_use_bytes,
       err_msg("capacity_bytes(%u) " SIZE_FORMAT
               " capacity_bytes_slow(%u)" SIZE_FORMAT,
               i, capacity_bytes(i), i, capacity_in_use_bytes));
   }
 #endif
 }
 void MetaspaceAux::verify_used() {
 #ifdef ASSERT
   size_t running_sum_used_bytes = used_bytes();
   // For purposes of the running sum of used, verify against used
   size_t used_in_use_bytes = used_bytes_slow();
   assert(used_bytes() == used_in_use_bytes,
     err_msg("used_bytes() " SIZE_FORMAT
             " used_bytes_slow()" SIZE_FORMAT,
             used_bytes(), used_in_use_bytes));
   for (Metaspace::MetadataType i = Metaspace::ClassType;
        i < Metaspace:: MetadataTypeCount;
        i = (Metaspace::MetadataType)(i + 1)) {
     size_t used_in_use_bytes = used_bytes_slow(i);
     assert(used_bytes(i) == used_in_use_bytes,
       err_msg("used_bytes(%u) " SIZE_FORMAT
               " used_bytes_slow(%u)" SIZE_FORMAT,
               i, used_bytes(i), i, used_in_use_bytes));
   }
 #endif
 }
 void MetaspaceAux::verify_metrics() {
   verify_capacity();
   verify_used();
 }
 // Metaspace methods
 size_t Metaspace::_first_chunk_word_size = 0;
 size_t Metaspace::_first_class_chunk_word_size = 0;
 size_t Metaspace::_commit_alignment = 0;
 size_t Metaspace::_reserve_alignment = 0;
 Metaspace::Metaspace(Mutex* lock, MetaspaceType type) {
   initialize(lock, type);
 }
 Metaspace::~Metaspace() {
   delete _vsm;
   if (using_class_space()) {
     delete _class_vsm;
   }
 }
 VirtualSpaceList* Metaspace::_space_list = NULL;
 VirtualSpaceList* Metaspace::_class_space_list = NULL;
 ChunkManager* Metaspace::_chunk_manager_metadata = NULL;
 ChunkManager* Metaspace::_chunk_manager_class = NULL;
 #define VIRTUALSPACEMULTIPLIER 2
 #ifdef _LP64
 static const uint64_t UnscaledClassSpaceMax = (uint64_t(max_juint) + 1);
 void Metaspace::set_narrow_klass_base_and_shift(address metaspace_base, address cds_base) {
   // Figure out the narrow_klass_base and the narrow_klass_shift.  The
   // narrow_klass_base is the lower of the metaspace base and the cds base
   // (if cds is enabled).  The narrow_klass_shift depends on the distance
   // between the lower base and higher address.
   address lower_base;
   address higher_address;
 #if INCLUDE_CDS
   if (UseSharedSpaces) {
     higher_address = MAX2((address)(cds_base + FileMapInfo::shared_spaces_size()),
                           (address)(metaspace_base + compressed_class_space_size()));
     lower_base = MIN2(metaspace_base, cds_base);
   } else
 #endif
   {
     higher_address = metaspace_base + compressed_class_space_size();
     lower_base = metaspace_base;
     uint64_t klass_encoding_max = UnscaledClassSpaceMax << LogKlassAlignmentInBytes;
     // If compressed class space fits in lower 32G, we don't need a base.
     if (higher_address <= (address)klass_encoding_max) {
       lower_base = 0; // effectively lower base is zero.
     }
   }
   Universe::set_narrow_klass_base(lower_base);
   if ((uint64_t)(higher_address - lower_base) <= UnscaledClassSpaceMax) {
     Universe::set_narrow_klass_shift(0);
   } else {
     assert(!UseSharedSpaces, "Cannot shift with UseSharedSpaces");
     Universe::set_narrow_klass_shift(LogKlassAlignmentInBytes);
   }
 }
 #if INCLUDE_CDS
 // Return TRUE if the specified metaspace_base and cds_base are close enough
 // to work with compressed klass pointers.
 bool Metaspace::can_use_cds_with_metaspace_addr(char* metaspace_base, address cds_base) {
   assert(cds_base != 0 && UseSharedSpaces, "Only use with CDS");
   assert(UseCompressedClassPointers, "Only use with CompressedKlassPtrs");
   address lower_base = MIN2((address)metaspace_base, cds_base);
   address higher_address = MAX2((address)(cds_base + FileMapInfo::shared_spaces_size()),
                                 (address)(metaspace_base + compressed_class_space_size()));
   return ((uint64_t)(higher_address - lower_base) <= UnscaledClassSpaceMax);
 }
 #endif
 // Try to allocate the metaspace at the requested addr.
 void Metaspace::allocate_metaspace_compressed_klass_ptrs(char* requested_addr, address cds_base) {
   assert(using_class_space(), "called improperly");
   assert(UseCompressedClassPointers, "Only use with CompressedKlassPtrs");
   assert(compressed_class_space_size() < KlassEncodingMetaspaceMax,
          "Metaspace size is too big");
   assert_is_ptr_aligned(requested_addr, _reserve_alignment);
   assert_is_ptr_aligned(cds_base, _reserve_alignment);
   assert_is_size_aligned(compressed_class_space_size(), _reserve_alignment);
   // Don't use large pages for the class space.
   bool large_pages = false;
 #ifndef MIPS64
   ReservedSpace metaspace_rs = ReservedSpace(compressed_class_space_size(),
                                              _reserve_alignment,
                                              large_pages,
                                              requested_addr, 0);
 #else // MIPS64
   ReservedSpace metaspace_rs;
   // Our compressed klass pointers may fit nicely into the lower 32
   // bits.
   if ((uint64_t)requested_addr + compressed_class_space_size() < 4*G) {
     metaspace_rs = ReservedSpace(compressed_class_space_size(),
                                  _reserve_alignment,
                                  large_pages,
                                  requested_addr);
   }
   if (! metaspace_rs.is_reserved()) {
     size_t increment = 4*G;
     for (char *a = (char *)align_ptr_up(requested_addr, increment);
          a < (char*)(1024*G);
          a += increment) {
 #if INCLUDE_CDS
       if (UseSharedSpaces
           && ! can_use_cds_with_metaspace_addr(a, cds_base)) {
         // We failed to find an aligned base that will reach.  Fall
         // back to using our requested addr.
         metaspace_rs = ReservedSpace(compressed_class_space_size(),
                                      _reserve_alignment,
                                      large_pages,
                                      requested_addr);
         break;
       }
 #endif
       metaspace_rs = ReservedSpace(compressed_class_space_size(),
                                    _reserve_alignment,
                                    large_pages,
                                    a);
       if (metaspace_rs.is_reserved())
         break;
     }
   }
 #endif // MIPS64
   if (!metaspace_rs.is_reserved()) {
 #if INCLUDE_CDS
     if (UseSharedSpaces) {
       size_t increment = align_size_up(1*G, _reserve_alignment);
       // Keep trying to allocate the metaspace, increasing the requested_addr
       // by 1GB each time, until we reach an address that will no longer allow
       // use of CDS with compressed klass pointers.
       char *addr = requested_addr;
       while (!metaspace_rs.is_reserved() && (addr + increment > addr) &&
              can_use_cds_with_metaspace_addr(addr + increment, cds_base)) {
         addr = addr + increment;
         metaspace_rs = ReservedSpace(compressed_class_space_size(),
                                      _reserve_alignment, large_pages, addr, 0);
       }
     }
 #endif
     // If no successful allocation then try to allocate the space anywhere.  If
     // that fails then OOM doom.  At this point we cannot try allocating the
     // metaspace as if UseCompressedClassPointers is off because too much
     // initialization has happened that depends on UseCompressedClassPointers.
     // So, UseCompressedClassPointers cannot be turned off at this point.
     if (!metaspace_rs.is_reserved()) {
       metaspace_rs = ReservedSpace(compressed_class_space_size(),
                                    _reserve_alignment, large_pages);
       if (!metaspace_rs.is_reserved()) {
         vm_exit_during_initialization(err_msg("Could not allocate metaspace: %d bytes",
                                               compressed_class_space_size()));
       }
     }
   }
   // If we got here then the metaspace got allocated.
   MemTracker::record_virtual_memory_type((address)metaspace_rs.base(), mtClass);
 #if INCLUDE_CDS
   // Verify that we can use shared spaces.  Otherwise, turn off CDS.
   if (UseSharedSpaces && !can_use_cds_with_metaspace_addr(metaspace_rs.base(), cds_base)) {
     FileMapInfo::stop_sharing_and_unmap(
         "Could not allocate metaspace at a compatible address");
   }
 #endif
   set_narrow_klass_base_and_shift((address)metaspace_rs.base(),
                                   UseSharedSpaces ? (address)cds_base : 0);
   initialize_class_space(metaspace_rs);
   if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
     gclog_or_tty->print_cr("Narrow klass base: " PTR_FORMAT ", Narrow klass shift: " SIZE_FORMAT,
                             Universe::narrow_klass_base(), Universe::narrow_klass_shift());
     gclog_or_tty->print_cr("Compressed class space size: " SIZE_FORMAT " Address: " PTR_FORMAT " Req Addr: " PTR_FORMAT,
                            compressed_class_space_size(), metaspace_rs.base(), requested_addr);
   }
 }
 // For UseCompressedClassPointers the class space is reserved above the top of
 // the Java heap.  The argument passed in is at the base of the compressed space.
 void Metaspace::initialize_class_space(ReservedSpace rs) {
   // The reserved space size may be bigger because of alignment, esp with UseLargePages
   assert(rs.size() >= CompressedClassSpaceSize,
          err_msg(SIZE_FORMAT " != " UINTX_FORMAT, rs.size(), CompressedClassSpaceSize));
   assert(using_class_space(), "Must be using class space");
   _class_space_list = new VirtualSpaceList(rs);
   _chunk_manager_class = new ChunkManager(ClassSpecializedChunk, ClassSmallChunk, ClassMediumChunk);
   if (!_class_space_list->initialization_succeeded()) {
     vm_exit_during_initialization("Failed to setup compressed class space virtual space list.");
   }
 }
 #endif
 void Metaspace::ergo_initialize() {
   if (DumpSharedSpaces) {
     // Using large pages when dumping the shared archive is currently not implemented.
     FLAG_SET_ERGO(bool, UseLargePagesInMetaspace, false);
   }
   size_t page_size = os::vm_page_size();
   if (UseLargePages && UseLargePagesInMetaspace) {
     page_size = os::large_page_size();
   }
   _commit_alignment  = page_size;
   _reserve_alignment = MAX2(page_size, (size_t)os::vm_allocation_granularity());
   // Do not use FLAG_SET_ERGO to update MaxMetaspaceSize, since this will
   // override if MaxMetaspaceSize was set on the command line or not.
   // This information is needed later to conform to the specification of the
   // java.lang.management.MemoryUsage API.
   //
   // Ideally, we would be able to set the default value of MaxMetaspaceSize in
   // globals.hpp to the aligned value, but this is not possible, since the
   // alignment depends on other flags being parsed.
   MaxMetaspaceSize = align_size_down_bounded(MaxMetaspaceSize, _reserve_alignment);
   if (MetaspaceSize > MaxMetaspaceSize) {
     MetaspaceSize = MaxMetaspaceSize;
   }
   MetaspaceSize = align_size_down_bounded(MetaspaceSize, _commit_alignment);
   assert(MetaspaceSize <= MaxMetaspaceSize, "MetaspaceSize should be limited by MaxMetaspaceSize");
   if (MetaspaceSize < 256*K) {
     vm_exit_during_initialization("Too small initial Metaspace size");
   }
   MinMetaspaceExpansion = align_size_down_bounded(MinMetaspaceExpansion, _commit_alignment);
   MaxMetaspaceExpansion = align_size_down_bounded(MaxMetaspaceExpansion, _commit_alignment);
   CompressedClassSpaceSize = align_size_down_bounded(CompressedClassSpaceSize, _reserve_alignment);
   set_compressed_class_space_size(CompressedClassSpaceSize);
   // Initial virtual space size will be calculated at global_initialize()
   uintx min_metaspace_sz =
       VIRTUALSPACEMULTIPLIER * InitialBootClassLoaderMetaspaceSize;
   if (UseCompressedClassPointers) {
     if ((min_metaspace_sz + CompressedClassSpaceSize) >  MaxMetaspaceSize) {
       if (min_metaspace_sz >= MaxMetaspaceSize) {
         vm_exit_during_initialization("MaxMetaspaceSize is too small.");
       } else {
         FLAG_SET_ERGO(uintx, CompressedClassSpaceSize,
                       MaxMetaspaceSize - min_metaspace_sz);
       }
     }
   } else if (min_metaspace_sz >= MaxMetaspaceSize) {
     FLAG_SET_ERGO(uintx, InitialBootClassLoaderMetaspaceSize,
                   min_metaspace_sz);
   }
 }
 void Metaspace::global_initialize() {
   MetaspaceGC::initialize();
   // Initialize the alignment for shared spaces.
   int max_alignment = os::vm_allocation_granularity();
   size_t cds_total = 0;
   MetaspaceShared::set_max_alignment(max_alignment);
   if (DumpSharedSpaces) {
 #if INCLUDE_CDS
     MetaspaceShared::estimate_regions_size();
     SharedReadOnlySize  = align_size_up(SharedReadOnlySize,  max_alignment);
     SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment);
     SharedMiscDataSize  = align_size_up(SharedMiscDataSize,  max_alignment);
     SharedMiscCodeSize  = align_size_up(SharedMiscCodeSize,  max_alignment);
     // the min_misc_code_size estimate is based on MetaspaceShared::generate_vtable_methods()
     uintx min_misc_code_size = align_size_up(
       (MetaspaceShared::num_virtuals * MetaspaceShared::vtbl_list_size) *
         (sizeof(void*) + MetaspaceShared::vtbl_method_size) + MetaspaceShared::vtbl_common_code_size,
           max_alignment);
     if (SharedMiscCodeSize < min_misc_code_size) {
       report_out_of_shared_space(SharedMiscCode);
     }
     // Initialize with the sum of the shared space sizes.  The read-only
     // and read write metaspace chunks will be allocated out of this and the
     // remainder is the misc code and data chunks.
     cds_total = FileMapInfo::shared_spaces_size();
     cds_total = align_size_up(cds_total, _reserve_alignment);
     _space_list = new VirtualSpaceList(cds_total/wordSize);
     _chunk_manager_metadata = new ChunkManager(SpecializedChunk, SmallChunk, MediumChunk);
     if (!_space_list->initialization_succeeded()) {
       vm_exit_during_initialization("Unable to dump shared archive.", NULL);
     }
 #ifdef _LP64
     if (cds_total + compressed_class_space_size() > UnscaledClassSpaceMax) {
       vm_exit_during_initialization("Unable to dump shared archive.",
           err_msg("Size of archive (" SIZE_FORMAT ") + compressed class space ("
                   SIZE_FORMAT ") == total (" SIZE_FORMAT ") is larger than compressed "
                   "klass limit: " SIZE_FORMAT, cds_total, compressed_class_space_size(),
                   cds_total + compressed_class_space_size(), UnscaledClassSpaceMax));
     }
     // Set the compressed klass pointer base so that decoding of these pointers works
     // properly when creating the shared archive.
     assert(UseCompressedOops && UseCompressedClassPointers,
       "UseCompressedOops and UseCompressedClassPointers must be set");
     Universe::set_narrow_klass_base((address)_space_list->current_virtual_space()->bottom());
     if (TraceMetavirtualspaceAllocation && Verbose) {
       gclog_or_tty->print_cr("Setting_narrow_klass_base to Address: " PTR_FORMAT,
                              _space_list->current_virtual_space()->bottom());
     }
     Universe::set_narrow_klass_shift(0);
 #endif // _LP64
 #endif // INCLUDE_CDS
   } else {
 #if INCLUDE_CDS
     // If using shared space, open the file that contains the shared space
     // and map in the memory before initializing the rest of metaspace (so
     // the addresses don't conflict)
     address cds_address = NULL;
     if (UseSharedSpaces) {
       FileMapInfo* mapinfo = new FileMapInfo();
       // Open the shared archive file, read and validate the header. If
       // initialization fails, shared spaces [UseSharedSpaces] are
       // disabled and the file is closed.
       // Map in spaces now also
       if (mapinfo->initialize() && MetaspaceShared::map_shared_spaces(mapinfo)) {
         cds_total = FileMapInfo::shared_spaces_size();
         cds_address = (address)mapinfo->region_base(0);
       } else {
         assert(!mapinfo->is_open() && !UseSharedSpaces,
                "archive file not closed or shared spaces not disabled.");
       }
     }
 #endif // INCLUDE_CDS
 #ifdef _LP64
     // If UseCompressedClassPointers is set then allocate the metaspace area
     // above the heap and above the CDS area (if it exists).
     if (using_class_space()) {
       if (UseSharedSpaces) {
 #if INCLUDE_CDS
         char* cds_end = (char*)(cds_address + cds_total);
         cds_end = (char *)align_ptr_up(cds_end, _reserve_alignment);
         allocate_metaspace_compressed_klass_ptrs(cds_end, cds_address);
 #endif
       } else {
         char* base = (char*)align_ptr_up(Universe::heap()->reserved_region().end(), _reserve_alignment);
         allocate_metaspace_compressed_klass_ptrs(base, 0);
       }
     }
 #endif // _LP64
     // Initialize these before initializing the VirtualSpaceList
     _first_chunk_word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord;
     _first_chunk_word_size = align_word_size_up(_first_chunk_word_size);
     // Make the first class chunk bigger than a medium chunk so it's not put
     // on the medium chunk list.   The next chunk will be small and progress
     // from there.  This size calculated by -version.
     _first_class_chunk_word_size = MIN2((size_t)MediumChunk*6,
                                        (CompressedClassSpaceSize/BytesPerWord)*2);
     _first_class_chunk_word_size = align_word_size_up(_first_class_chunk_word_size);
     // Arbitrarily set the initial virtual space to a multiple
     // of the boot class loader size.
     size_t word_size = VIRTUALSPACEMULTIPLIER * _first_chunk_word_size;
     word_size = align_size_up(word_size, Metaspace::reserve_alignment_words());
     // Initialize the list of virtual spaces.
     _space_list = new VirtualSpaceList(word_size);
     _chunk_manager_metadata = new ChunkManager(SpecializedChunk, SmallChunk, MediumChunk);
     if (!_space_list->initialization_succeeded()) {
       vm_exit_during_initialization("Unable to setup metadata virtual space list.", NULL);
     }
   }
   _tracer = new MetaspaceTracer();
 }
 void Metaspace::post_initialize() {
   MetaspaceGC::post_initialize();
 }
 void Metaspace::initialize_first_chunk(MetaspaceType type, MetadataType mdtype) {
   Metachunk* chunk = get_initialization_chunk(type, mdtype);
   if (chunk != NULL) {
     // Add to this manager's list of chunks in use and current_chunk().
     get_space_manager(mdtype)->add_chunk(chunk, true);
   }
 }
 Metachunk* Metaspace::get_initialization_chunk(MetaspaceType type, MetadataType mdtype) {
   size_t chunk_word_size = get_space_manager(mdtype)->get_initial_chunk_size(type);
   // Get a chunk from the chunk freelist
   Metachunk* chunk = get_chunk_manager(mdtype)->chunk_freelist_allocate(chunk_word_size);
   if (chunk == NULL) {
     chunk = get_space_list(mdtype)->get_new_chunk(chunk_word_size,
                                                   get_space_manager(mdtype)->medium_chunk_bunch());
   }
   // For dumping shared archive, report error if allocation has failed.
   if (DumpSharedSpaces && chunk == NULL) {
     report_insufficient_metaspace(MetaspaceAux::committed_bytes() + chunk_word_size * BytesPerWord);
   }
   return chunk;
 }
 void Metaspace::verify_global_initialization() {
   assert(space_list() != NULL, "Metadata VirtualSpaceList has not been initialized");
   assert(chunk_manager_metadata() != NULL, "Metadata ChunkManager has not been initialized");
   if (using_class_space()) {
     assert(class_space_list() != NULL, "Class VirtualSpaceList has not been initialized");
     assert(chunk_manager_class() != NULL, "Class ChunkManager has not been initialized");
   }
 }
 void Metaspace::initialize(Mutex* lock, MetaspaceType type) {
   verify_global_initialization();
   // Allocate SpaceManager for metadata objects.
   _vsm = new SpaceManager(NonClassType, lock);
   if (using_class_space()) {
     // Allocate SpaceManager for classes.
     _class_vsm = new SpaceManager(ClassType, lock);
   }
   MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
   // Allocate chunk for metadata objects
   initialize_first_chunk(type, NonClassType);
   // Allocate chunk for class metadata objects
   if (using_class_space()) {
     initialize_first_chunk(type, ClassType);
   }
   _alloc_record_head = NULL;
   _alloc_record_tail = NULL;
 }
 size_t Metaspace::align_word_size_up(size_t word_size) {
   size_t byte_size = word_size * wordSize;
   return ReservedSpace::allocation_align_size_up(byte_size) / wordSize;
 }
 MetaWord* Metaspace::allocate(size_t word_size, MetadataType mdtype) {
   // DumpSharedSpaces doesn't use class metadata area (yet)
   // Also, don't use class_vsm() unless UseCompressedClassPointers is true.
   if (is_class_space_allocation(mdtype)) {
     return  class_vsm()->allocate(word_size);
   } else {
     return  vsm()->allocate(word_size);
   }
 }
 MetaWord* Metaspace::expand_and_allocate(size_t word_size, MetadataType mdtype) {
   size_t delta_bytes = MetaspaceGC::delta_capacity_until_GC(word_size * BytesPerWord);
   assert(delta_bytes > 0, "Must be");
   size_t before = 0;
   size_t after = 0;
   MetaWord* res;
   bool incremented;
   // Each thread increments the HWM at most once. Even if the thread fails to increment
   // the HWM, an allocation is still attempted. This is because another thread must then
   // have incremented the HWM and therefore the allocation might still succeed.
   do {
     incremented = MetaspaceGC::inc_capacity_until_GC(delta_bytes, &after, &before);
     res = allocate(word_size, mdtype);
   } while (!incremented && res == NULL);
   if (incremented) {
     tracer()->report_gc_threshold(before, after,
                                   MetaspaceGCThresholdUpdater::ExpandAndAllocate);
     if (PrintGCDetails && Verbose) {
       gclog_or_tty->print_cr("Increase capacity to GC from " SIZE_FORMAT
           " to " SIZE_FORMAT, before, after);
     }
   }
   return res;
 }
 // Space allocated in the Metaspace.  This may
 // be across several metadata virtual spaces.
 char* Metaspace::bottom() const {
   assert(DumpSharedSpaces, "only useful and valid for dumping shared spaces");
   return (char*)vsm()->current_chunk()->bottom();
 }
 size_t Metaspace::used_words_slow(MetadataType mdtype) const {
   if (mdtype == ClassType) {
     return using_class_space() ? class_vsm()->sum_used_in_chunks_in_use() : 0;
   } else {
     return vsm()->sum_used_in_chunks_in_use();  // includes overhead!
   }
 }
 size_t Metaspace::free_words_slow(MetadataType mdtype) const {
   if (mdtype == ClassType) {
     return using_class_space() ? class_vsm()->sum_free_in_chunks_in_use() : 0;
   } else {
     return vsm()->sum_free_in_chunks_in_use();
   }
 }
 // Space capacity in the Metaspace.  It includes
 // space in the list of chunks from which allocations
 // have been made. Don't include space in the global freelist and
 // in the space available in the dictionary which
 // is already counted in some chunk.
 size_t Metaspace::capacity_words_slow(MetadataType mdtype) const {
   if (mdtype == ClassType) {
     return using_class_space() ? class_vsm()->sum_capacity_in_chunks_in_use() : 0;
   } else {
     return vsm()->sum_capacity_in_chunks_in_use();
   }
 }
 size_t Metaspace::used_bytes_slow(MetadataType mdtype) const {
   return used_words_slow(mdtype) * BytesPerWord;
 }
 size_t Metaspace::capacity_bytes_slow(MetadataType mdtype) const {
   return capacity_words_slow(mdtype) * BytesPerWord;
 }
 size_t Metaspace::allocated_blocks_bytes() const {
   return vsm()->allocated_blocks_bytes() +
       (using_class_space() ? class_vsm()->allocated_blocks_bytes() : 0);
 }
 size_t Metaspace::allocated_chunks_bytes() const {
   return vsm()->allocated_chunks_bytes() +
       (using_class_space() ? class_vsm()->allocated_chunks_bytes() : 0);
 }
 void Metaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) {
   if (SafepointSynchronize::is_at_safepoint()) {
     if (DumpSharedSpaces && PrintSharedSpaces) {
       record_deallocation(ptr, vsm()->get_raw_word_size(word_size));
     }
     assert(Thread::current()->is_VM_thread(), "should be the VM thread");
     // Don't take Heap_lock
     MutexLockerEx ml(vsm()->lock(), Mutex::_no_safepoint_check_flag);
     if (word_size < TreeChunk<Metablock, FreeList<Metablock> >::min_size()) {
       // Dark matter.  Too small for dictionary.
 #ifdef ASSERT
       Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5);
 #endif
       return;
     }
     if (is_class && using_class_space()) {
       class_vsm()->deallocate(ptr, word_size);
     } else {
       vsm()->deallocate(ptr, word_size);
     }
   } else {
     MutexLockerEx ml(vsm()->lock(), Mutex::_no_safepoint_check_flag);
     if (word_size < TreeChunk<Metablock, FreeList<Metablock> >::min_size()) {
       // Dark matter.  Too small for dictionary.
 #ifdef ASSERT
       Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5);
 #endif
       return;
     }
     if (is_class && using_class_space()) {
       class_vsm()->deallocate(ptr, word_size);
     } else {
       vsm()->deallocate(ptr, word_size);
     }
   }
 }
 MetaWord* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size,
                               bool read_only, MetaspaceObj::Type type, TRAPS) {
   if (HAS_PENDING_EXCEPTION) {
     assert(false, "Should not allocate with exception pending");
     return NULL;  // caller does a CHECK_NULL too
   }
   assert(loader_data != NULL, "Should never pass around a NULL loader_data. "
         "ClassLoaderData::the_null_class_loader_data() should have been used.");
   // Allocate in metaspaces without taking out a lock, because it deadlocks
   // with the SymbolTable_lock.  Dumping is single threaded for now.  We'll have
   // to revisit this for application class data sharing.
   if (DumpSharedSpaces) {
     assert(type > MetaspaceObj::UnknownType && type < MetaspaceObj::_number_of_types, "sanity");
     Metaspace* space = read_only ? loader_data->ro_metaspace() : loader_data->rw_metaspace();
     MetaWord* result = space->allocate(word_size, NonClassType);
     if (result == NULL) {
       report_out_of_shared_space(read_only ? SharedReadOnly : SharedReadWrite);
     }
     if (PrintSharedSpaces) {
       space->record_allocation(result, type, space->vsm()->get_raw_word_size(word_size));
     }
     // Zero initialize.
     Copy::fill_to_aligned_words((HeapWord*)result, word_size, 0);
     return result;
   }
   MetadataType mdtype = (type == MetaspaceObj::ClassType) ? ClassType : NonClassType;
   // Try to allocate metadata.
   MetaWord* result = loader_data->metaspace_non_null()->allocate(word_size, mdtype);
   if (result == NULL) {
     tracer()->report_metaspace_allocation_failure(loader_data, word_size, type, mdtype);
     // Allocation failed.
     if (is_init_completed()) {
       // Only start a GC if the bootstrapping has completed.
       // Try to clean out some memory and retry.
       result = Universe::heap()->collector_policy()->satisfy_failed_metadata_allocation(
           loader_data, word_size, mdtype);
     }
   }
   if (result == NULL) {
     report_metadata_oome(loader_data, word_size, type, mdtype, CHECK_NULL);
   }
   // Zero initialize.
   Copy::fill_to_aligned_words((HeapWord*)result, word_size, 0);
   return result;
 }
 size_t Metaspace::class_chunk_size(size_t word_size) {
   assert(using_class_space(), "Has to use class space");
   return class_vsm()->calc_chunk_size(word_size);
 }
 void Metaspace::report_metadata_oome(ClassLoaderData* loader_data, size_t word_size, MetaspaceObj::Type type, MetadataType mdtype, TRAPS) {
   tracer()->report_metadata_oom(loader_data, word_size, type, mdtype);
   // If result is still null, we are out of memory.
   if (Verbose && TraceMetadataChunkAllocation) {
     gclog_or_tty->print_cr("Metaspace allocation failed for size "
         SIZE_FORMAT, word_size);
     if (loader_data->metaspace_or_null() != NULL) {
       loader_data->dump(gclog_or_tty);
     }
     MetaspaceAux::dump(gclog_or_tty);
   }
   bool out_of_compressed_class_space = false;
   if (is_class_space_allocation(mdtype)) {
     Metaspace* metaspace = loader_data->metaspace_non_null();
     out_of_compressed_class_space =
       MetaspaceAux::committed_bytes(Metaspace::ClassType) +
       (metaspace->class_chunk_size(word_size) * BytesPerWord) >
       CompressedClassSpaceSize;
   }
   // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support
   const char* space_string = out_of_compressed_class_space ?
     "Compressed class space" : "Metaspace";
   report_java_out_of_memory(space_string);
   if (JvmtiExport::should_post_resource_exhausted()) {
     JvmtiExport::post_resource_exhausted(
         JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR,
         space_string);
   }
   if (!is_init_completed()) {
     vm_exit_during_initialization("OutOfMemoryError", space_string);
   }
   if (out_of_compressed_class_space) {
     THROW_OOP(Universe::out_of_memory_error_class_metaspace());
   } else {
     THROW_OOP(Universe::out_of_memory_error_metaspace());
   }
 }
 const char* Metaspace::metadata_type_name(Metaspace::MetadataType mdtype) {
   switch (mdtype) {
     case Metaspace::ClassType: return "Class";
     case Metaspace::NonClassType: return "Metadata";
     default:
       assert(false, err_msg("Got bad mdtype: %d", (int) mdtype));
       return NULL;
   }
 }
 void Metaspace::record_allocation(void* ptr, MetaspaceObj::Type type, size_t word_size) {
   assert(DumpSharedSpaces, "sanity");
   int byte_size = (int)word_size * HeapWordSize;
   AllocRecord *rec = new AllocRecord((address)ptr, type, byte_size);
   if (_alloc_record_head == NULL) {
     _alloc_record_head = _alloc_record_tail = rec;
   } else if (_alloc_record_tail->_ptr + _alloc_record_tail->_byte_size == (address)ptr) {
     _alloc_record_tail->_next = rec;
     _alloc_record_tail = rec;
   } else {
     // slow linear search, but this doesn't happen that often, and only when dumping
     for (AllocRecord *old = _alloc_record_head; old; old = old->_next) {
       if (old->_ptr == ptr) {
         assert(old->_type == MetaspaceObj::DeallocatedType, "sanity");
         int remain_bytes = old->_byte_size - byte_size;
         assert(remain_bytes >= 0, "sanity");
         old->_type = type;
         if (remain_bytes == 0) {
           delete(rec);
         } else {
           address remain_ptr = address(ptr) + byte_size;
           rec->_ptr = remain_ptr;
           rec->_byte_size = remain_bytes;
           rec->_type = MetaspaceObj::DeallocatedType;
           rec->_next = old->_next;
           old->_byte_size = byte_size;
           old->_next = rec;
         }
         return;
       }
     }
     assert(0, "reallocating a freed pointer that was not recorded");
   }
 }
 void Metaspace::record_deallocation(void* ptr, size_t word_size) {
   assert(DumpSharedSpaces, "sanity");
   for (AllocRecord *rec = _alloc_record_head; rec; rec = rec->_next) {
     if (rec->_ptr == ptr) {
       assert(rec->_byte_size == (int)word_size * HeapWordSize, "sanity");
       rec->_type = MetaspaceObj::DeallocatedType;
       return;
     }
   }
   assert(0, "deallocating a pointer that was not recorded");
 }
 void Metaspace::iterate(Metaspace::AllocRecordClosure *closure) {
   assert(DumpSharedSpaces, "unimplemented for !DumpSharedSpaces");
   address last_addr = (address)bottom();
   for (AllocRecord *rec = _alloc_record_head; rec; rec = rec->_next) {
     address ptr = rec->_ptr;
     if (last_addr < ptr) {
       closure->doit(last_addr, MetaspaceObj::UnknownType, ptr - last_addr);
     }
     closure->doit(ptr, rec->_type, rec->_byte_size);
     last_addr = ptr + rec->_byte_size;
   }
   address top = ((address)bottom()) + used_bytes_slow(Metaspace::NonClassType);
   if (last_addr < top) {
     closure->doit(last_addr, MetaspaceObj::UnknownType, top - last_addr);
   }
 }
 void Metaspace::purge(MetadataType mdtype) {
   get_space_list(mdtype)->purge(get_chunk_manager(mdtype));
 }
 void Metaspace::purge() {
   MutexLockerEx cl(SpaceManager::expand_lock(),
                    Mutex::_no_safepoint_check_flag);
   purge(NonClassType);
   if (using_class_space()) {
     purge(ClassType);
   }
 }
 void Metaspace::print_on(outputStream* out) const {
   // Print both class virtual space counts and metaspace.
   if (Verbose) {
     vsm()->print_on(out);
     if (using_class_space()) {
       class_vsm()->print_on(out);
     }
   }
 }
 bool Metaspace::contains(const void* ptr) {
   if (UseSharedSpaces && MetaspaceShared::is_in_shared_space(ptr)) {
     return true;
   }
   if (using_class_space() && get_space_list(ClassType)->contains(ptr)) {
      return true;
   }
   return get_space_list(NonClassType)->contains(ptr);
 }
 void Metaspace::verify() {
   vsm()->verify();
   if (using_class_space()) {
     class_vsm()->verify();
   }
 }
 void Metaspace::dump(outputStream* const out) const {
   out->print_cr("\nVirtual space manager: " INTPTR_FORMAT, vsm());
   vsm()->dump(out);
   if (using_class_space()) {
     out->print_cr("\nClass space manager: " INTPTR_FORMAT, class_vsm());
     class_vsm()->dump(out);
   }
 }
 /////////////// Unit tests ///////////////
 #ifndef PRODUCT
 class TestMetaspaceAuxTest : AllStatic {
  public:
   static void test_reserved() {
     size_t reserved = MetaspaceAux::reserved_bytes();
     assert(reserved > 0, "assert");
     size_t committed  = MetaspaceAux::committed_bytes();
     assert(committed <= reserved, "assert");
     size_t reserved_metadata = MetaspaceAux::reserved_bytes(Metaspace::NonClassType);
     assert(reserved_metadata > 0, "assert");
     assert(reserved_metadata <= reserved, "assert");
     if (UseCompressedClassPointers) {
       size_t reserved_class    = MetaspaceAux::reserved_bytes(Metaspace::ClassType);
       assert(reserved_class > 0, "assert");
       assert(reserved_class < reserved, "assert");
     }
   }
   static void test_committed() {
     size_t committed = MetaspaceAux::committed_bytes();
     assert(committed > 0, "assert");
     size_t reserved  = MetaspaceAux::reserved_bytes();
     assert(committed <= reserved, "assert");
     size_t committed_metadata = MetaspaceAux::committed_bytes(Metaspace::NonClassType);
     assert(committed_metadata > 0, "assert");
     assert(committed_metadata <= committed, "assert");
     if (UseCompressedClassPointers) {
       size_t committed_class    = MetaspaceAux::committed_bytes(Metaspace::ClassType);
       assert(committed_class > 0, "assert");
       assert(committed_class < committed, "assert");
     }
   }
   static void test_virtual_space_list_large_chunk() {
     VirtualSpaceList* vs_list = new VirtualSpaceList(os::vm_allocation_granularity());
     MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
     // A size larger than VirtualSpaceSize (256k) and add one page to make it _not_ be
     // vm_allocation_granularity aligned on Windows.
     size_t large_size = (size_t)(2*256*K + (os::vm_page_size()/BytesPerWord));
     large_size += (os::vm_page_size()/BytesPerWord);
     vs_list->get_new_chunk(large_size, 0);
   }
   static void test() {
     test_reserved();
     test_committed();
     test_virtual_space_list_large_chunk();
   }
 };
 void TestMetaspaceAux_test() {
   TestMetaspaceAuxTest::test();
 }
 class TestVirtualSpaceNodeTest {
   static void chunk_up(size_t words_left, size_t& num_medium_chunks,
                                           size_t& num_small_chunks,
                                           size_t& num_specialized_chunks) {
     num_medium_chunks = words_left / MediumChunk;
     words_left = words_left % MediumChunk;
     num_small_chunks = words_left / SmallChunk;
     words_left = words_left % SmallChunk;
     // how many specialized chunks can we get?
     num_specialized_chunks = words_left / SpecializedChunk;
     assert(words_left % SpecializedChunk == 0, "should be nothing left");
   }
  public:
   static void test() {
     MutexLockerEx ml(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
     const size_t vsn_test_size_words = MediumChunk  * 4;
     const size_t vsn_test_size_bytes = vsn_test_size_words * BytesPerWord;
     // The chunk sizes must be multiples of eachother, or this will fail
     STATIC_ASSERT(MediumChunk % SmallChunk == 0);
     STATIC_ASSERT(SmallChunk % SpecializedChunk == 0);
     { // No committed memory in VSN
       ChunkManager cm(SpecializedChunk, SmallChunk, MediumChunk);
       VirtualSpaceNode vsn(vsn_test_size_bytes);
       vsn.initialize();
       vsn.retire(&cm);
       assert(cm.sum_free_chunks_count() == 0, "did not commit any memory in the VSN");
     }
     { // All of VSN is committed, half is used by chunks
       ChunkManager cm(SpecializedChunk, SmallChunk, MediumChunk);
       VirtualSpaceNode vsn(vsn_test_size_bytes);
       vsn.initialize();
       vsn.expand_by(vsn_test_size_words, vsn_test_size_words);
       vsn.get_chunk_vs(MediumChunk);
       vsn.get_chunk_vs(MediumChunk);
       vsn.retire(&cm);
       assert(cm.sum_free_chunks_count() == 2, "should have been memory left for 2 medium chunks");
       assert(cm.sum_free_chunks() == 2*MediumChunk, "sizes should add up");
     }
     { // 4 pages of VSN is committed, some is used by chunks
       ChunkManager cm(SpecializedChunk, SmallChunk, MediumChunk);
       VirtualSpaceNode vsn(vsn_test_size_bytes);
       const size_t page_chunks = 4 * (size_t)os::vm_page_size() / BytesPerWord;
       assert(page_chunks < MediumChunk, "Test expects medium chunks to be at least 4*page_size");
       vsn.initialize();
       vsn.expand_by(page_chunks, page_chunks);
       vsn.get_chunk_vs(SmallChunk);
       vsn.get_chunk_vs(SpecializedChunk);
       vsn.retire(&cm);
       // committed - used = words left to retire
       const size_t words_left = page_chunks - SmallChunk - SpecializedChunk;
       size_t num_medium_chunks, num_small_chunks, num_spec_chunks;
       chunk_up(words_left, num_medium_chunks, num_small_chunks, num_spec_chunks);
       assert(num_medium_chunks == 0, "should not get any medium chunks");
       assert(cm.sum_free_chunks_count() == (num_small_chunks + num_spec_chunks), "should be space for 3 chunks");
       assert(cm.sum_free_chunks() == words_left, "sizes should add up");
     }
     { // Half of VSN is committed, a humongous chunk is used
       ChunkManager cm(SpecializedChunk, SmallChunk, MediumChunk);
       VirtualSpaceNode vsn(vsn_test_size_bytes);
       vsn.initialize();
       vsn.expand_by(MediumChunk * 2, MediumChunk * 2);
       vsn.get_chunk_vs(MediumChunk + SpecializedChunk); // Humongous chunks will be aligned up to MediumChunk + SpecializedChunk
       vsn.retire(&cm);
       const size_t words_left = MediumChunk * 2 - (MediumChunk + SpecializedChunk);
       size_t num_medium_chunks, num_small_chunks, num_spec_chunks;
       chunk_up(words_left, num_medium_chunks, num_small_chunks, num_spec_chunks);
       assert(num_medium_chunks == 0, "should not get any medium chunks");
       assert(cm.sum_free_chunks_count() == (num_small_chunks + num_spec_chunks), "should be space for 3 chunks");
       assert(cm.sum_free_chunks() == words_left, "sizes should add up");
     }
   }
 #define assert_is_available_positive(word_size) \
   assert(vsn.is_available(word_size), \
     err_msg(#word_size ": " PTR_FORMAT " bytes were not available in " \
             "VirtualSpaceNode [" PTR_FORMAT ", " PTR_FORMAT ")", \
             (uintptr_t)(word_size * BytesPerWord), vsn.bottom(), vsn.end()));
 #define assert_is_available_negative(word_size) \
   assert(!vsn.is_available(word_size), \
     err_msg(#word_size ": " PTR_FORMAT " bytes should not be available in " \
             "VirtualSpaceNode [" PTR_FORMAT ", " PTR_FORMAT ")", \
             (uintptr_t)(word_size * BytesPerWord), vsn.bottom(), vsn.end()));
   static void test_is_available_positive() {
     // Reserve some memory.
     VirtualSpaceNode vsn(os::vm_allocation_granularity());
     assert(vsn.initialize(), "Failed to setup VirtualSpaceNode");
     // Commit some memory.
     size_t commit_word_size = os::vm_allocation_granularity() / BytesPerWord;
     bool expanded = vsn.expand_by(commit_word_size, commit_word_size);
     assert(expanded, "Failed to commit");
     // Check that is_available accepts the committed size.
     assert_is_available_positive(commit_word_size);
     // Check that is_available accepts half the committed size.
     size_t expand_word_size = commit_word_size / 2;
     assert_is_available_positive(expand_word_size);
   }
   static void test_is_available_negative() {
     // Reserve some memory.
     VirtualSpaceNode vsn(os::vm_allocation_granularity());
     assert(vsn.initialize(), "Failed to setup VirtualSpaceNode");
     // Commit some memory.
     size_t commit_word_size = os::vm_allocation_granularity() / BytesPerWord;
     bool expanded = vsn.expand_by(commit_word_size, commit_word_size);
     assert(expanded, "Failed to commit");
     // Check that is_available doesn't accept a too large size.
     size_t two_times_commit_word_size = commit_word_size * 2;
     assert_is_available_negative(two_times_commit_word_size);
   }
   static void test_is_available_overflow() {
     // Reserve some memory.
     VirtualSpaceNode vsn(os::vm_allocation_granularity());
     assert(vsn.initialize(), "Failed to setup VirtualSpaceNode");
     // Commit some memory.
     size_t commit_word_size = os::vm_allocation_granularity() / BytesPerWord;
     bool expanded = vsn.expand_by(commit_word_size, commit_word_size);
     assert(expanded, "Failed to commit");
     // Calculate a size that will overflow the virtual space size.
     void* virtual_space_max = (void*)(uintptr_t)-1;
     size_t bottom_to_max = pointer_delta(virtual_space_max, vsn.bottom(), 1);
     size_t overflow_size = bottom_to_max + BytesPerWord;
     size_t overflow_word_size = overflow_size / BytesPerWord;
     // Check that is_available can handle the overflow.
     assert_is_available_negative(overflow_word_size);
   }
   static void test_is_available() {
     TestVirtualSpaceNodeTest::test_is_available_positive();
     TestVirtualSpaceNodeTest::test_is_available_negative();
     TestVirtualSpaceNodeTest::test_is_available_overflow();
   }
 };
 void TestVirtualSpaceNode_test() {
   TestVirtualSpaceNodeTest::test();
   TestVirtualSpaceNodeTest::test_is_available();
 }
 // The following test is placed here instead of a gtest / unittest file
 // because the ChunkManager class is only available in this file.
 class SpaceManagerTest : AllStatic {
   friend void SpaceManager_test_adjust_initial_chunk_size();
   static void test_adjust_initial_chunk_size(bool is_class) {
     const size_t smallest = SpaceManager::smallest_chunk_size(is_class);
     const size_t normal   = SpaceManager::small_chunk_size(is_class);
     const size_t medium   = SpaceManager::medium_chunk_size(is_class);
 #define test_adjust_initial_chunk_size(value, expected, is_class_value)          \
     do {                                                                         \
       size_t v = value;                                                          \
       size_t e = expected;                                                       \
       assert(SpaceManager::adjust_initial_chunk_size(v, (is_class_value)) == e,  \
              err_msg("Expected: " SIZE_FORMAT " got: " SIZE_FORMAT, e, v));      \
     } while (0)
     // Smallest (specialized)
     test_adjust_initial_chunk_size(1,            smallest, is_class);
     test_adjust_initial_chunk_size(smallest - 1, smallest, is_class);
     test_adjust_initial_chunk_size(smallest,     smallest, is_class);
     // Small
     test_adjust_initial_chunk_size(smallest + 1, normal, is_class);
     test_adjust_initial_chunk_size(normal - 1,   normal, is_class);
     test_adjust_initial_chunk_size(normal,       normal, is_class);
     // Medium
     test_adjust_initial_chunk_size(normal + 1, medium, is_class);
     test_adjust_initial_chunk_size(medium - 1, medium, is_class);
     test_adjust_initial_chunk_size(medium,     medium, is_class);
     // Humongous
     test_adjust_initial_chunk_size(medium + 1, medium + 1, is_class);
 #undef test_adjust_initial_chunk_size
   }
   static void test_adjust_initial_chunk_size() {
     test_adjust_initial_chunk_size(false);
     test_adjust_initial_chunk_size(true);
   }
 };
 void SpaceManager_test_adjust_initial_chunk_size() {
   SpaceManagerTest::test_adjust_initial_chunk_size();
 }
 // The following test is placed here instead of a gtest / unittest file
 // because the ChunkManager class is only available in this file.
 void ChunkManager_test_list_index() {
   ChunkManager manager(ClassSpecializedChunk, ClassSmallChunk, ClassMediumChunk);
   // Test previous bug where a query for a humongous class metachunk,
   // incorrectly matched the non-class medium metachunk size.
   {
     assert(MediumChunk > ClassMediumChunk, "Precondition for test");
     ChunkIndex index = manager.list_index(MediumChunk);
     assert(index == HumongousIndex,
            err_msg("Requested size is larger than ClassMediumChunk,"
            " so should return HumongousIndex. Got index: %d", (int)index));
   }
   // Check the specified sizes as well.
   {
     ChunkIndex index = manager.list_index(ClassSpecializedChunk);
     assert(index == SpecializedIndex, err_msg("Wrong index returned. Got index: %d", (int)index));
   }
   {
     ChunkIndex index = manager.list_index(ClassSmallChunk);
     assert(index == SmallIndex, err_msg("Wrong index returned. Got index: %d", (int)index));
   }
   {
     ChunkIndex index = manager.list_index(ClassMediumChunk);
     assert(index == MediumIndex, err_msg("Wrong index returned. Got index: %d", (int)index));
   }
   {
     ChunkIndex index = manager.list_index(ClassMediumChunk + 1);
     assert(index == HumongousIndex, err_msg("Wrong index returned. Got index: %d", (int)index));
   }
 }
 #endif

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/memory/metaspace.cpp@acf02173a790 (annotated)

src/share/vm/memory/metaspace.cpp