jdk8-mips64-public/hotspot: src/share/vm/memory/metaspace.cpp@03049e0e8544 (annotated)

src/share/vm/memory/metaspace.cpp@03049e0e8544 (annotated)

src/share/vm/memory/metaspace.cpp

Mon, 03 Sep 2012 18:37:12 -0400

author: coleenp
date: Mon, 03 Sep 2012 18:37:12 -0400
changeset 4038: 03049e0e8544
parent 4037: da91efe96a93
child 4042: 5d2156bcb78b
permissions: -rw-r--r--

7195823: NPG: CMS reserved() doesn't match _rs.base().
Summary: If the commit fails, the size isn't set so the assert fails.
Reviewed-by: kamg

 /*
  * Copyright (c) 2011, 2012, 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/binaryTreeDictionary.hpp"
 #include "memory/collectorPolicy.hpp"
 #include "memory/filemap.hpp"
 #include "memory/freeList.hpp"
 #include "memory/metaspace.hpp"
 #include "memory/metaspaceShared.hpp"
 #include "memory/resourceArea.hpp"
 #include "memory/universe.hpp"
 #include "runtime/globals.hpp"
 #include "runtime/mutex.hpp"
 #include "services/memTracker.hpp"
 #include "utilities/copy.hpp"
 #include "utilities/debug.hpp"
 // Define this macro to deallocate Metablock.  If not defined,
 // blocks are not yet deallocated and are only mangled.
 #undef DEALLOCATE_BLOCKS
 // Easily recognizable patterns
 // These patterns can be the same in 32bit or 64bit since
 // they only have to be easily recognizable.
 const void* metaspace_allocation_leader = (void*) 0X11111111;
 const void* metaspace_allocation_trailer = (void*) 0X77777777;
 // Parameters for stress mode testing
 const uint metadata_deallocate_a_lot_block = 10;
 const uint metadata_deallocate_a_lock_chunk = 3;
 size_t const allocation_from_dictionary_limit = 64 * K;
 const size_t metadata_chunk_initialize = 0xf7f7f7f7;
 const size_t metadata_deallocate = 0xf5f5f5f5;
 const size_t metadata_space_manager_allocate = 0xf3f3f3f3;
 MetaWord* last_allocated = 0;
 // Used in declarations in SpaceManager and ChunkManager
 enum ChunkIndex {
   SmallIndex = 0,
   MediumIndex = 1,
   HumongousIndex = 2,
   NumberOfFreeLists = 3
 };
 static ChunkIndex next_chunk_index(ChunkIndex i) {
   assert(i < NumberOfFreeLists, "Out of bound");
   return (ChunkIndex) (i+1);
 }
 // Originally _capacity_until_GC was set to MetaspaceSize here but
 // the default MetaspaceSize before argument processing was being
 // used which was not the desired value.  See the code
 // in should_expand() to see how the initialization is handled
 // now.
 size_t MetaspaceGC::_capacity_until_GC = 0;
 bool MetaspaceGC::_expand_after_GC = false;
 uint MetaspaceGC::_shrink_factor = 0;
 bool MetaspaceGC::_should_concurrent_collect = false;
 // Blocks of space for metadata are allocated out of Metachunks.
 //
 // Metachunk are allocated out of MetadataVirtualspaces and once
 // allocated there is no explicit link between a Metachunk and
 // the MetadataVirtualspaces from which it was allocated.
 //
 // Each SpaceManager maintains a
 // list of the chunks it is using and the current chunk.  The current
 // chunk is the chunk from which allocations are done.  Space freed in
 // a chunk is placed on the free list of blocks (BlockFreelist) and
 // reused from there.
 //
 // Future modification
 //
 // The Metachunk can conceivable be replaced by the Chunk in
 // allocation.hpp.  Note that the latter Chunk is the space for
 // allocation (allocations from the chunk are out of the space in
 // the Chunk after the header for the Chunk) where as Metachunks
 // point to space in a VirtualSpace.  To replace Metachunks with
 // Chunks, change Chunks so that they can be allocated out of a VirtualSpace.
 //
 // Metablock are the unit of allocation from a Chunk.  It contains
 // the size of the requested allocation in a debug build.
 // Also in a debug build it has a marker before and after the
 // body of the block. The address of the body is the address returned
 // by the allocation.
 //
 // Layout in a debug build.  In a product build only the body is present.
 //
 //     +-----------+-----------+------------+     +-----------+
 //     | word size | leader    | body       | ... | trailer   |
 //     +-----------+-----------+------------+     +-----------+
 //
 // A Metablock may be reused by its SpaceManager but are never moved between
 // SpaceManagers.  There is no explicit link to the Metachunk
 // from which it was allocated.  Metablock are not deallocated, rather
 // the Metachunk it is a part of will be deallocated when it's
 // associated class loader is collected.
 //
 // When the word size of a block is passed in to the deallocation
 // call the word size no longer needs to be part of a Metablock.
 class Metablock {
   friend class VMStructs;
  private:
   // Used to align the allocation (see below) and for debugging.
 #ifdef ASSERT
   struct {
     size_t _word_size;
     void*  _leader;
   } _header;
   void* _data[1];
 #endif
   static size_t _overhead;
 #ifdef ASSERT
   void set_word_size(size_t v) { _header._word_size = v; }
   void* leader() { return _header._leader; }
   void* trailer() {
     jlong index = (jlong) _header._word_size - sizeof(_header)/BytesPerWord - 1;
     assert(index > 0, err_msg("Bad indexling of trailer %d", index));
     void** ptr = &_data[index];
     return *ptr;
   }
   void set_leader(void* v) { _header._leader = v; }
   void set_trailer(void* v) {
     void** ptr = &_data[_header._word_size - sizeof(_header)/BytesPerWord - 1];
     *ptr = v;
   }
  public:
   size_t word_size() { return _header._word_size; }
 #endif
  public:
   static Metablock* initialize(MetaWord* p, size_t word_size);
   // This places the body of the block at a 2 word boundary
   // because every block starts on a 2 word boundary.  Work out
   // how to make the body on a 2 word boundary if the block
   // starts on a arbitrary boundary.  JJJ
 #ifdef ASSERT
   MetaWord* data() { return (MetaWord*) &_data[0]; }
 #else
   MetaWord* data() { return (MetaWord*) this; }
 #endif
   static Metablock* metablock_from_data(MetaWord* p) {
 #ifdef ASSERT
     size_t word_offset = offset_of(Metablock, _data)/BytesPerWord;
     Metablock* result = (Metablock*) (p - word_offset);
     return result;
 #else
     return (Metablock*) p;
 #endif
   }
   static size_t overhead() { return _overhead; }
   void verify();
 };
 //  Metachunk - Quantum of allocation from a Virtualspace
 //    Metachunks are reused (when freed are put on a global freelist) and
 //    have no permanent association to a SpaceManager.
 //            +--------------+ <- end
 //            |              |          --+       ---+
 //            |              |            | free     |
 //            |              |            |          |
 //            |              |            |          | capacity
 //            |              |            |          |
 //            |              | <- top   --+          |
 //            |              |           ---+        |
 //            |              |              | used   |
 //            |              |              |        |
 //            |              |              |        |
 //            +--------------+ <- bottom ---+     ---+
 class Metachunk VALUE_OBJ_CLASS_SPEC {
   // link to support lists of chunks
   Metachunk* _next;
   MetaWord* _bottom;
   MetaWord* _end;
   MetaWord* _top;
   size_t _word_size;
   // Metachunks are allocated out of a MetadataVirtualSpace and
   // and use some of its space to describe itself (plus alignment
   // considerations).  Metadata is allocated in the rest of the chunk.
   // This size is the overhead of maintaining the Metachunk within
   // the space.
   static size_t _overhead;
   void set_bottom(MetaWord* v) { _bottom = v; }
   void set_end(MetaWord* v) { _end = v; }
   void set_top(MetaWord* v) { _top = v; }
   void set_word_size(size_t v) { _word_size = v; }
  public:
   // Used to add a Metachunk to a list of Metachunks
   void set_next(Metachunk* v) { _next = v; assert(v != this, "Boom");}
   Metablock* allocate(size_t word_size);
   static Metachunk* initialize(MetaWord* ptr, size_t word_size);
   // Accessors
   Metachunk* next() const { return _next; }
   MetaWord* bottom() const { return _bottom; }
   MetaWord* end() const { return _end; }
   MetaWord* top() const { return _top; }
   size_t word_size() const { return _word_size; }
   static size_t overhead() { return _overhead; }
   // Reset top to bottom so chunk can be reused.
   void reset_empty() { _top = (_bottom + _overhead); }
   bool is_empty() { return _top == (_bottom + _overhead); }
   // used (has been allocated)
   // free (available for future allocations)
   // capacity (total size of chunk)
   size_t used_word_size();
   size_t free_word_size();
   size_t capacity_word_size();
 #ifdef ASSERT
   void mangle() {
     // Mangle the payload of the chunk and not the links that
     // maintain list of chunks.
     HeapWord* start = (HeapWord*)(bottom() + overhead());
     size_t word_size = capacity_word_size() - overhead();
     Copy::fill_to_words(start, word_size, metadata_chunk_initialize);
   }
 #endif // ASSERT
   void print_on(outputStream* st) const;
   void verify();
 };
 // Pointer to list of Metachunks.
 class ChunkList VALUE_OBJ_CLASS_SPEC {
   // List of free chunks
   Metachunk* _head;
  public:
   // Constructor
   ChunkList() : _head(NULL) {}
   // Accessors
   Metachunk* head() { return _head; }
   void set_head(Metachunk* v) { _head = v; }
   // Link at head of the list
   void add_at_head(Metachunk* head, Metachunk* tail);
   void add_at_head(Metachunk* head);
   size_t sum_list_size();
   size_t sum_list_count();
   size_t sum_list_capacity();
 };
 // Manages the global free lists of chunks.
 // Has three lists of free chunks, and a total size and
 // count that includes all three
 class ChunkManager VALUE_OBJ_CLASS_SPEC {
   // Free list of chunks of different sizes.
   //   SmallChunk
   //   MediumChunk
   //   HumongousChunk
   ChunkList _free_chunks[3];
   // 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 locked_verify_free_chunks_count();
   void verify_free_chunks_count();
  public:
   ChunkManager() : _free_chunks_total(0), _free_chunks_count(0) {}
   // add or delete (return) a chunk to the global freelist.
   Metachunk* chunk_freelist_allocate(size_t word_size);
   void chunk_freelist_deallocate(Metachunk* chunk);
   // Total of the space in the free chunks list
   size_t free_chunks_total();
   size_t free_chunks_total_in_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);
   }
   ChunkList* free_medium_chunks() { return &_free_chunks[1]; }
   ChunkList* free_small_chunks() { return &_free_chunks[0]; }
   ChunkList* free_humongous_chunks() { return &_free_chunks[2]; }
   ChunkList* free_chunks(ChunkIndex index);
   // Returns the list for the given chunk word size.
   ChunkList* find_free_chunks_list(size_t word_size);
   // Add and remove from a list by size.  Selects
   // list based on size of chunk.
   void free_chunks_put(Metachunk* chuck);
   Metachunk* free_chunks_get(size_t chunk_word_size);
   // Debug support
   void verify();
   void locked_verify();
   void verify_free_chunks_total();
   void locked_print_free_chunks(outputStream* st);
   void locked_print_sum_free_chunks(outputStream* st);
 };
 // 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 {
 #ifdef DEALLOCATE_BLOCKS
   BinaryTreeDictionary<Metablock>* _dictionary;
 #endif
   static Metablock* initialize_free_chunk(Metablock* block, size_t word_size);
 #ifdef DEALLOCATE_BLOCKS
   // Accessors
   BinaryTreeDictionary<Metablock>* dictionary() const { return _dictionary; }
 #endif
  public:
   BlockFreelist();
   ~BlockFreelist();
   // Get and return a block to the free list
   Metablock* get_block(size_t word_size);
   void return_block(Metablock* block, size_t word_size);
   size_t totalSize() {
 #ifdef DEALLOCATE_BLOCKS
     if (dictionary() == NULL) {
       return 0;
     } else {
       return dictionary()->totalSize();
     }
 #else
     return 0;
 #endif
   }
   void print_on(outputStream* st) const;
 };
 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;
   // Convenience functions for logical bottom and end
   MetaWord* bottom() const { return (MetaWord*) _virtual_space.low(); }
   MetaWord* end() const { return (MetaWord*) _virtual_space.high(); }
   // Convenience functions to access the _virtual_space
   char* low()  const { return virtual_space()->low(); }
   char* high() const { return virtual_space()->high(); }
  public:
   VirtualSpaceNode(size_t byte_size);
   VirtualSpaceNode(ReservedSpace rs) : _top(NULL), _next(NULL), _rs(rs) {}
   ~VirtualSpaceNode();
   // 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 virtual space
   bool is_available(size_t word_size) { return _top + word_size <= end(); }
   MetaWord* top() const { return _top; }
   void inc_top(size_t word_size) { _top += word_size; }
   // 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);
   Metachunk* get_chunk_vs_with_expand(size_t chunk_word_size);
   // Expands/shrinks the committed space in a virtual space.  Delegates
   // to Virtualspace
   bool expand_by(size_t words, bool pre_touch = false);
   bool shrink_by(size_t words);
   // Debug support
   static void verify_virtual_space_total();
   static void verify_virtual_space_count();
   void mangle();
   void print_on(outputStream* st) const;
 };
   // byte_size is the size of the associated virtualspace.
 VirtualSpaceNode::VirtualSpaceNode(size_t byte_size) : _top(NULL), _next(NULL), _rs(0) {
   // This allocates memory with mmap.  For DumpSharedspaces, allocate the
   // space at low memory so that other shared images don't conflict.
   // This is the same address as memory needed for UseCompressedOops but
   // compressed oops don't work with CDS (offsets in metadata are wrong), so
   // borrow the same address.
   if (DumpSharedSpaces) {
     char* shared_base = (char*)HeapBaseMinAddress;
     _rs = ReservedSpace(byte_size, 0, false, shared_base, 0);
     if (_rs.is_reserved()) {
       assert(_rs.base() == shared_base, "should match");
     } else {
       // If we are dumping the heap, then allocate a wasted block of address
       // space in order to push the heap to a lower address.  This extra
       // address range allows for other (or larger) libraries to be loaded
       // without them occupying the space required for the shared spaces.
       uintx reserved = 0;
       uintx block_size = 64*1024*1024;
       while (reserved < SharedDummyBlockSize) {
         char* dummy = os::reserve_memory(block_size);
         reserved += block_size;
       }
       _rs = ReservedSpace(byte_size);
     }
     MetaspaceShared::set_shared_rs(&_rs);
   } else {
     _rs = ReservedSpace(byte_size);
   }
   MemTracker::record_virtual_memory_type((address)_rs.base(), mtClass);
 }
 // List of VirtualSpaces for metadata allocation.
 // It has a  _next link for singly linked list and a MemRegion
 // for total space in the VirtualSpace.
 class VirtualSpaceList : public CHeapObj<mtClass> {
   friend class VirtualSpaceNode;
   enum VirtualSpaceSizes {
     VirtualSpaceSize = 256 * K
   };
   // Global list of virtual spaces
   // Head of the list
   VirtualSpaceNode* _virtual_space_list;
   // virtual space currently being used for allocations
   VirtualSpaceNode* _current_virtual_space;
   // Free chunk list for all other metadata
   ChunkManager      _chunk_manager;
   // Can this virtual list allocate >1 spaces?  Also, used to determine
   // whether to allocate unlimited small chunks in this virtual space
   bool _is_class;
   bool can_grow() const { return !is_class() || !UseCompressedKlassPointers; }
   // Sum of space in all virtual spaces and number of virtual spaces
   size_t _virtual_space_total;
   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, size_t vs_word_size);
   // 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 grow_vs(size_t vs_word_size);
  public:
   VirtualSpaceList(size_t word_size);
   VirtualSpaceList(ReservedSpace rs);
   Metachunk* get_new_chunk(size_t word_size, size_t grow_chunks_by_words);
   VirtualSpaceNode* current_virtual_space() {
     return _current_virtual_space;
   }
   ChunkManager* chunk_manager() { return &_chunk_manager; }
   bool is_class() const { return _is_class; }
   // Allocate the first virtualspace.
   void initialize(size_t word_size);
   size_t virtual_space_total() { return _virtual_space_total; }
   void inc_virtual_space_total(size_t v) {
     Atomic::add_ptr(v, &_virtual_space_total);
   }
   size_t virtual_space_count() { return _virtual_space_count; }
   void inc_virtual_space_count() {
     Atomic::inc_ptr(&_virtual_space_count);
   }
   // Used and capacity in the entire list of virtual spaces.
   // These are global values shared by all Metaspaces
   size_t capacity_words_sum();
   size_t capacity_bytes_sum() { return capacity_words_sum() * BytesPerWord; }
   size_t used_words_sum();
   size_t used_bytes_sum() { return used_words_sum() * BytesPerWord; }
   bool contains(const void *ptr);
   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 _deallocate_block_a_lot_count;
   static int _deallocate_chunk_a_lot_count;
   static int _allocation_fail_alot_count;
  public:
   static int deallocate_block_a_lot_count() {
     return _deallocate_block_a_lot_count;
   }
   static void set_deallocate_block_a_lot_count(int v) {
     _deallocate_block_a_lot_count = v;
   }
   static void inc_deallocate_block_a_lot_count() {
     _deallocate_block_a_lot_count++;
   }
   static int deallocate_chunk_a_lot_count() {
     return _deallocate_chunk_a_lot_count;
   }
   static void reset_deallocate_chunk_a_lot_count() {
     _deallocate_chunk_a_lot_count = 1;
   }
   static void inc_deallocate_chunk_a_lot_count() {
     _deallocate_chunk_a_lot_count++;
   }
   static void init_allocation_fail_alot_count();
 #ifdef ASSERT
   static bool test_metadata_failure();
 #endif
   static void deallocate_chunk_a_lot(SpaceManager* sm,
                                      size_t chunk_word_size);
   static void deallocate_block_a_lot(SpaceManager* sm,
                                      size_t chunk_word_size);
 };
 int Metadebug::_deallocate_block_a_lot_count = 0;
 int Metadebug::_deallocate_chunk_a_lot_count = 0;
 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 and contains.
   Mutex* const _lock;
   // 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[NumberOfFreeLists];
   Metachunk* _current_chunk;
   // Virtual space where allocation comes from.
   VirtualSpaceList* _vs_list;
   // Number of small chunks to allocate to a manager
   // If class space manager, small chunks are unlimited
   static uint const _small_chunk_limit;
   bool has_small_chunk_limit() { return !vs_list()->is_class(); }
   // Sum of all space in allocated chunks
   size_t _allocation_total;
   // 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;
   // 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;
   }
   VirtualSpaceList* vs_list() const    { return _vs_list; }
   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);
   // Debugging support
   void verify_chunks_in_use_index(ChunkIndex index, Metachunk* v) {
     switch (index) {
     case 0:
       assert(v->word_size() == SmallChunk, "Not a SmallChunk");
       break;
     case 1:
       assert(v->word_size() == MediumChunk, "Not a MediumChunk");
       break;
     case 2:
       assert(v->word_size() > MediumChunk, "Not a HumongousChunk");
       break;
     default:
       assert(false, "Wrong list.");
     }
   }
  protected:
   Mutex* lock() const { return _lock; }
  public:
   SpaceManager(Mutex* lock, VirtualSpaceList* vs_list);
   ~SpaceManager();
   enum ChunkSizes {    // in words.
     SmallChunk = 512,
     MediumChunk = 8 * K,
     MediumChunkBunch = 4 * MediumChunk
   };
   // Accessors
   size_t allocation_total() const { return _allocation_total; }
   void inc_allocation_total(size_t v) { Atomic::add_ptr(v, &_allocation_total); }
   static bool is_humongous(size_t word_size) { return word_size > MediumChunk; }
   static Mutex* expand_lock() { return _expand_lock; }
   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);
   // Block allocation and deallocation.
   // Allocates a block from the current chunk
   MetaWord* allocate(size_t word_size);
   // Helper for allocations
   Metablock* allocate_work(size_t word_size);
   // Returns a block to the per manager freelist
   void deallocate(MetaWord* p);
   // 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.
   Metablock* grow_and_allocate(size_t word_size);
   // 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();
 #ifdef ASSERT
   void mangle_freed_chunks();
   void verify_allocation_total();
 #endif
 };
 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);
 #ifdef ASSERT
 size_t Metablock::_overhead =
   Chunk::aligned_overhead_size(sizeof(Metablock)) / BytesPerWord;
 #else
 size_t Metablock::_overhead = 0;
 #endif
 size_t Metachunk::_overhead =
   Chunk::aligned_overhead_size(sizeof(Metachunk)) / BytesPerWord;
 // New blocks returned by the Metaspace are zero initialized.
 // We should fix the constructors to not assume this instead.
 Metablock* Metablock::initialize(MetaWord* p, size_t word_size) {
   Metablock* result = (Metablock*) p;
   // Clear the memory
   Copy::fill_to_aligned_words((HeapWord*)result, word_size);
 #ifdef ASSERT
   result->set_word_size(word_size);
   // Check after work size is set.
   result->set_leader((void*) metaspace_allocation_leader);
   result->set_trailer((void*) metaspace_allocation_trailer);
 #endif
   return result;
 }
 void Metablock::verify() {
 #ifdef ASSERT
   assert(leader() == metaspace_allocation_leader &&
          trailer() == metaspace_allocation_trailer,
          "block has been corrupted");
 #endif
 }
 // Metachunk methods
 Metachunk* Metachunk::initialize(MetaWord* ptr, size_t word_size) {
   // Set bottom, top, and end.  Allow space for the Metachunk itself
   Metachunk* chunk = (Metachunk*) ptr;
   MetaWord* chunk_bottom = ptr + _overhead;
   chunk->set_bottom(ptr);
   chunk->set_top(chunk_bottom);
   MetaWord* chunk_end = ptr + word_size;
   assert(chunk_end > chunk_bottom, "Chunk must be too small");
   chunk->set_end(chunk_end);
   chunk->set_next(NULL);
   chunk->set_word_size(word_size);
 #ifdef ASSERT
   size_t data_word_size = pointer_delta(chunk_end, chunk_bottom, sizeof(MetaWord));
   Copy::fill_to_words((HeapWord*) chunk_bottom, data_word_size, metadata_chunk_initialize);
 #endif
   return chunk;
 }
 Metablock* Metachunk::allocate(size_t word_size) {
   Metablock* result = NULL;
   // If available, bump the pointer to allocate.
   if (free_word_size() >= word_size) {
     result = Metablock::initialize(_top, word_size);
     _top = _top + word_size;
   }
 #ifdef ASSERT
   assert(result == NULL ||
          result->word_size() == word_size,
          "Block size is not set correctly");
 #endif
   return result;
 }
 // _bottom points to the start of the chunk including the overhead.
 size_t Metachunk::used_word_size() {
   return pointer_delta(_top, _bottom, sizeof(MetaWord));
 }
 size_t Metachunk::free_word_size() {
   return pointer_delta(_end, _top, sizeof(MetaWord));
 }
 size_t Metachunk::capacity_word_size() {
   return pointer_delta(_end, _bottom, sizeof(MetaWord));
 }
 void Metachunk::print_on(outputStream* st) const {
   st->print_cr("Metachunk:"
                " bottom " PTR_FORMAT " top " PTR_FORMAT
                " end " PTR_FORMAT " size " SIZE_FORMAT,
                bottom(), top(), end(), word_size());
 }
 void Metachunk::verify() {
 #ifdef ASSERT
   // Cannot walk through the blocks unless the blocks have
   // headers with sizes.
   MetaWord* curr = bottom() + overhead();
   while (curr < top()) {
     Metablock* block = (Metablock*) curr;
     size_t word_size = block->word_size();
     block->verify();
     curr = curr + word_size;
   }
 #endif
   return;
 }
 // BlockFreelist methods
 #ifdef DEALLOCATE_BLOCKS
 BlockFreelist::BlockFreelist() : _dictionary(NULL) {}
 #else
 BlockFreelist::BlockFreelist() {}
 #endif
 BlockFreelist::~BlockFreelist() {
 #ifdef DEALLOCATE_BLOCKS
   if (_dictionary != NULL) {
     if (Verbose && TraceMetadataChunkAllocation) {
       _dictionary->print_free_lists(gclog_or_tty);
     }
     delete _dictionary;
   }
 #endif
 }
 Metablock* BlockFreelist::initialize_free_chunk(Metablock* block, size_t word_size) {
 #ifdef DEALLOCATE_BLOCKS
 #ifdef ASSERT
   assert(word_size = block->word_size(), "Wrong chunk size");
 #endif
   Metablock* result = block;
   result->setSize(word_size);
   result->linkPrev(NULL);
   result->linkNext(NULL);
   return result;
 #else
   ShouldNotReachHere();
   return block;
 #endif
 }
 void BlockFreelist::return_block(Metablock* block, size_t word_size) {
 #ifdef ASSERT
   assert(word_size = block->word_size(), "Block size is wrong");;
 #endif
   Metablock* free_chunk = initialize_free_chunk(block, word_size);
 #ifdef DEALLOCATE_BLOCKS
   if (dictionary() == NULL) {
    _dictionary = new BinaryTreeDictionary<Metablock>(false /* adaptive_freelists */);
   }
   dictionary()->returnChunk(free_chunk);
 #endif
 }
 Metablock* BlockFreelist::get_block(size_t word_size) {
 #ifdef DEALLOCATE_BLOCKS
   if (dictionary() == NULL) {
     return NULL;
   }
   Metablock* free_chunk =
     dictionary()->getChunk(word_size, FreeBlockDictionary<Metablock>::exactly);
 #else
   Metablock* free_chunk = NULL;
 #endif
   if (free_chunk == NULL) {
     return NULL;
   }
   assert(free_chunk->word_size() == word_size, "Size of chunk is incorrect");
   Metablock* block = Metablock::initialize((MetaWord*) free_chunk, word_size);
 #ifdef ASSERT
   assert(block->word_size() == word_size, "Block size is not set correctly");
 #endif
   return block;
 }
 void BlockFreelist::print_on(outputStream* st) const {
 #ifdef DEALLOCATE_BLOCKS
   if (dictionary() == NULL) {
     return;
   }
   dictionary()->print_free_lists(st);
 #else
   return;
 #endif
 }
 // VirtualSpaceNode methods
 VirtualSpaceNode::~VirtualSpaceNode() {
   _rs.release();
 }
 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));
 }
 // 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");
   if (!is_available(chunk_word_size)) {
     if (TraceMetadataChunkAllocation) {
       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(tty);
     }
     return NULL;
   }
   // Take the space  (bump top on the current virtual space).
   inc_top(chunk_word_size);
   // Point the chunk at the space
   Metachunk* result = Metachunk::initialize(chunk_limit, chunk_word_size);
   return result;
 }
 // Expand the virtual space (commit more of the reserved space)
 bool VirtualSpaceNode::expand_by(size_t words, bool pre_touch) {
   size_t bytes = words * BytesPerWord;
   bool result =  virtual_space()->expand_by(bytes, pre_touch);
   if (TraceMetavirtualspaceAllocation && !result) {
     gclog_or_tty->print_cr("VirtualSpaceNode::expand_by() failed "
                            "for byte size " SIZE_FORMAT, bytes);
     virtual_space()->print();
   }
   return result;
 }
 // Shrink the virtual space (commit more of the reserved space)
 bool VirtualSpaceNode::shrink_by(size_t words) {
   size_t bytes = words * BytesPerWord;
   virtual_space()->shrink_by(bytes);
   return true;
 }
 // Add another chunk to the chunk list.
 Metachunk* VirtualSpaceNode::get_chunk_vs(size_t chunk_word_size) {
   assert_lock_strong(SpaceManager::expand_lock());
   Metachunk* result = NULL;
   return take_from_committed(chunk_word_size);
 }
 Metachunk* VirtualSpaceNode::get_chunk_vs_with_expand(size_t chunk_word_size) {
   assert_lock_strong(SpaceManager::expand_lock());
   Metachunk* new_chunk = get_chunk_vs(chunk_word_size);
   if (new_chunk == NULL) {
     // Only a small part of the virtualspace is committed when first
     // allocated so committing more here can be expected.
     size_t page_size_words = os::vm_page_size() / BytesPerWord;
     size_t aligned_expand_vs_by_words = align_size_up(chunk_word_size,
                                                     page_size_words);
     expand_by(aligned_expand_vs_by_words, false);
     new_chunk = get_chunk_vs(chunk_word_size);
   }
   return new_chunk;
 }
 bool VirtualSpaceNode::initialize() {
   if (!_rs.is_reserved()) {
     return false;
   }
   // Commit only 1 page instead of the whole reserved space _rs.size()
   size_t committed_byte_size = os::vm_page_size();
   bool result = virtual_space()->initialize(_rs, committed_byte_size);
   if (result) {
     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, used * 100 / capacity,
            bottom(), top(), end(),
            vs->high_boundary());
 }
 void VirtualSpaceNode::mangle() {
   size_t word_size = capacity_words_in_vs();
   Copy::fill_to_words((HeapWord*) low(), word_size, 0xf1f1f1f1);
 }
 // VirtualSpaceList methods
 // Space allocated from the VirtualSpace
 VirtualSpaceList::~VirtualSpaceList() {
   VirtualSpaceListIterator iter(virtual_space_list());
   while (iter.repeat()) {
     VirtualSpaceNode* vsl = iter.get_next();
     delete vsl;
   }
 }
 size_t VirtualSpaceList::used_words_sum() {
   size_t allocated_by_vs = 0;
   VirtualSpaceListIterator iter(virtual_space_list());
   while (iter.repeat()) {
     VirtualSpaceNode* vsl = iter.get_next();
     // Sum used region [bottom, top) in each virtualspace
     allocated_by_vs += vsl->used_words_in_vs();
   }
   assert(allocated_by_vs >= chunk_manager()->free_chunks_total(),
     err_msg("Total in free chunks " SIZE_FORMAT
             " greater than total from virtual_spaces " SIZE_FORMAT,
             allocated_by_vs, chunk_manager()->free_chunks_total()));
   size_t used =
     allocated_by_vs - chunk_manager()->free_chunks_total();
   return used;
 }
 // Space available in all MetadataVirtualspaces allocated
 // for metadata.  This is the upper limit on the capacity
 // of chunks allocated out of all the MetadataVirtualspaces.
 size_t VirtualSpaceList::capacity_words_sum() {
   size_t capacity = 0;
   VirtualSpaceListIterator iter(virtual_space_list());
   while (iter.repeat()) {
     VirtualSpaceNode* vsl = iter.get_next();
     capacity += vsl->capacity_words_in_vs();
   }
   return capacity;
 }
 VirtualSpaceList::VirtualSpaceList(size_t word_size ) :
                                    _is_class(false),
                                    _virtual_space_list(NULL),
                                    _current_virtual_space(NULL),
                                    _virtual_space_total(0),
                                    _virtual_space_count(0) {
   MutexLockerEx cl(SpaceManager::expand_lock(),
                    Mutex::_no_safepoint_check_flag);
   bool initialization_succeeded = grow_vs(word_size);
   assert(initialization_succeeded,
     " VirtualSpaceList initialization should not fail");
 }
 VirtualSpaceList::VirtualSpaceList(ReservedSpace rs) :
                                    _is_class(true),
                                    _virtual_space_list(NULL),
                                    _current_virtual_space(NULL),
                                    _virtual_space_total(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();
   assert(succeeded, " VirtualSpaceList initialization should not fail");
   link_vs(class_entry, rs.size()/BytesPerWord);
 }
 // Allocate another meta virtual space and add it to the list.
 bool VirtualSpaceList::grow_vs(size_t vs_word_size) {
   assert_lock_strong(SpaceManager::expand_lock());
   if (vs_word_size == 0) {
     return false;
   }
   // Reserve the space
   size_t vs_byte_size = vs_word_size * BytesPerWord;
   assert(vs_byte_size % os::vm_page_size() == 0, "Not aligned");
   // 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 {
     link_vs(new_entry, vs_word_size);
     return true;
   }
 }
 void VirtualSpaceList::link_vs(VirtualSpaceNode* new_entry, size_t vs_word_size) {
   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_virtual_space_total(vs_word_size);
   inc_virtual_space_count();
 #ifdef ASSERT
   new_entry->mangle();
 #endif
   if (TraceMetavirtualspaceAllocation && Verbose) {
     VirtualSpaceNode* vsl = current_virtual_space();
     vsl->print_on(tty);
   }
 }
 Metachunk* VirtualSpaceList::get_new_chunk(size_t word_size,
                                            size_t grow_chunks_by_words) {
   // Get a chunk from the chunk freelist
   Metachunk* next = chunk_manager()->chunk_freelist_allocate(grow_chunks_by_words);
   // Allocate a chunk out of the current virtual space.
   if (next == NULL) {
     next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words);
   }
   if (next == NULL) {
     // Not enough room in current virtual space.  Try to commit
     // more space.
     size_t expand_vs_by_words = MAX2((size_t)SpaceManager::MediumChunkBunch,
                                        grow_chunks_by_words);
     size_t page_size_words = os::vm_page_size() / BytesPerWord;
     size_t aligned_expand_vs_by_words = align_size_up(expand_vs_by_words,
                                                         page_size_words);
     bool vs_expanded =
       current_virtual_space()->expand_by(aligned_expand_vs_by_words, false);
     if (!vs_expanded) {
       // Should the capacity of the metaspaces be expanded for
       // this allocation?  If it's the virtual space for classes and is
       // being used for CompressedHeaders, don't allocate a new virtualspace.
       if (can_grow() && MetaspaceGC::should_expand(this, word_size)) {
         // Get another virtual space.
           size_t grow_vs_words =
             MAX2((size_t)VirtualSpaceSize, aligned_expand_vs_by_words);
         if (grow_vs(grow_vs_words)) {
           // Got it.  It's on the list now.  Get a chunk from it.
           next = current_virtual_space()->get_chunk_vs_with_expand(grow_chunks_by_words);
         }
         if (TraceMetadataHumongousAllocation && SpaceManager::is_humongous(word_size)) {
           gclog_or_tty->print_cr("  aligned_expand_vs_by_words " PTR_FORMAT,
                                  aligned_expand_vs_by_words);
           gclog_or_tty->print_cr("  grow_vs_words " PTR_FORMAT,
                                  grow_vs_words);
         }
       } else {
         // Allocation will fail and induce a GC
         if (TraceMetadataChunkAllocation && Verbose) {
           gclog_or_tty->print_cr("VirtualSpaceList::get_new_chunk():"
             " Fail instead of expand the metaspace");
         }
       }
     } else {
       // The virtual space expanded, get a new chunk
       next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words);
       assert(next != NULL, "Just expanded, should succeed");
     }
   }
   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);
     }
   }
 }
 #ifndef PRODUCT
 bool VirtualSpaceList::contains(const void *ptr) {
   VirtualSpaceNode* list = virtual_space_list();
   VirtualSpaceListIterator iter(list);
   while (iter.repeat()) {
     VirtualSpaceNode* node = iter.get_next();
     if (node->reserved()->contains(ptr)) {
       return true;
     }
   }
   return false;
 }
 #endif // PRODUCT
 // 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 MinHeapFreeRatio and MaxHeapFreeRatio used
 // to resize the Java heap by some GC's.  New flags can be implemented
 // if really needed.  MinHeapFreeRatio is used to calculate how much
 // free space is desirable in the metaspace capacity to decide how much
 // to increase the HWM.  MaxHeapFreeRatio 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 (i.e. big enough for a word_size
 // allocation), increase by MaxMetaspaceExpansion.  If that is still
 // not enough, expand by the size of the allocation (word_size) plus
 // some.
 size_t MetaspaceGC::delta_capacity_until_GC(size_t word_size) {
   size_t before_inc = MetaspaceGC::capacity_until_GC();
   size_t min_delta_words = MinMetaspaceExpansion / BytesPerWord;
   size_t max_delta_words = MaxMetaspaceExpansion / BytesPerWord;
   size_t page_size_words = os::vm_page_size() / BytesPerWord;
   size_t size_delta_words = align_size_up(word_size, page_size_words);
   size_t delta_words = MAX2(size_delta_words, min_delta_words);
   if (delta_words > min_delta_words) {
     // 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_words = MAX2(delta_words, max_delta_words);
     if (delta_words > max_delta_words) {
       // This allocation is large but the next ones are probably not
       // so increase by the minimum.
       delta_words = delta_words + min_delta_words;
     }
   }
   return delta_words;
 }
 bool MetaspaceGC::should_expand(VirtualSpaceList* vsl, size_t word_size) {
   // Class virtual space should always be expanded.  Call GC for the other
   // metadata virtual space.
   if (vsl == Metaspace::class_space_list()) return true;
   // If the user wants a limit, impose one.
   size_t max_metaspace_size_words = MaxMetaspaceSize / BytesPerWord;
   size_t metaspace_size_words = MetaspaceSize / BytesPerWord;
   if (!FLAG_IS_DEFAULT(MaxMetaspaceSize) &&
       vsl->capacity_words_sum() >= max_metaspace_size_words) {
     return false;
   }
   // If this is part of an allocation after a GC, expand
   // unconditionally.
   if(MetaspaceGC::expand_after_GC()) {
     return true;
   }
   // If the capacity is below the minimum capacity, allow the
   // expansion.  Also set the high-water-mark (capacity_until_GC)
   // to that minimum capacity so that a GC will not be induced
   // until that minimum capacity is exceeded.
   if (vsl->capacity_words_sum() < metaspace_size_words ||
       capacity_until_GC() == 0) {
     set_capacity_until_GC(metaspace_size_words);
     return true;
   } else {
     if (vsl->capacity_words_sum() < capacity_until_GC()) {
       return true;
     } else {
       if (TraceMetadataChunkAllocation && Verbose) {
         gclog_or_tty->print_cr("  allocation request size " SIZE_FORMAT
                         "  capacity_until_GC " SIZE_FORMAT
                         "  capacity_words_sum " SIZE_FORMAT
                         "  used_words_sum " SIZE_FORMAT
                         "  free chunks " SIZE_FORMAT
                         "  free chunks count %d",
                         word_size,
                         capacity_until_GC(),
                         vsl->capacity_words_sum(),
                         vsl->used_words_sum(),
                         vsl->chunk_manager()->free_chunks_total(),
                         vsl->chunk_manager()->free_chunks_count());
       }
       return false;
     }
   }
 }
 // Variables are in bytes
 void MetaspaceGC::compute_new_size() {
   assert(_shrink_factor <= 100, "invalid shrink factor");
   uint current_shrink_factor = _shrink_factor;
   _shrink_factor = 0;
   VirtualSpaceList *vsl = Metaspace::space_list();
   size_t capacity_after_gc = vsl->capacity_bytes_sum();
   // Check to see if these two can be calculated without walking the CLDG
   size_t used_after_gc = vsl->used_bytes_sum();
   size_t capacity_until_GC = vsl->capacity_bytes_sum();
   size_t free_after_gc = capacity_until_GC - used_after_gc;
   const double minimum_free_percentage = MinHeapFreeRatio / 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) {
     const double free_percentage = ((double)free_after_gc) / capacity_until_GC;
     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);
     double d_free_after_gc = free_after_gc / (double) K;
     gclog_or_tty->print_cr("  "
                   "   free_after_gc       : %6.1fK"
                   "   used_after_gc       : %6.1fK"
                   "   capacity_after_gc   : %6.1fK"
                   "   metaspace HWM     : %6.1fK",
                   free_after_gc / (double) K,
                   used_after_gc / (double) K,
                   capacity_after_gc / (double) K,
                   capacity_until_GC / (double) K);
     gclog_or_tty->print_cr("  "
                   "   free_percentage: %6.2f",
                   free_percentage);
   }
   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;
     // Don't expand unless it's significant
     if (expand_bytes >= MinMetaspaceExpansion) {
       size_t expand_words = expand_bytes / BytesPerWord;
       MetaspaceGC::inc_capacity_until_GC(expand_words);
     }
     if (PrintGCDetails && Verbose) {
       size_t new_capacity_until_GC = MetaspaceGC::capacity_until_GC_in_bytes();
       gclog_or_tty->print_cr("    expanding:"
                     "  minimum_desired_capacity: %6.1fK"
                     "  expand_words: %6.1fK"
                     "  MinMetaspaceExpansion: %6.1fK"
                     "  new metaspace HWM:  %6.1fK",
                     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
   size_t shrink_words = 0;
   // We would never want to shrink more than this
   size_t max_shrink_words = capacity_until_GC - minimum_desired_capacity;
   assert(max_shrink_words >= 0, err_msg("max_shrink_words " SIZE_FORMAT,
     max_shrink_words));
   // Should shrinking be considered?
   if (MaxHeapFreeRatio < 100) {
     const double maximum_free_percentage = MaxHeapFreeRatio / 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 (PrintGC && 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("  "
                              "  capacity_until_GC: %6.1fK"
                              "  minimum_desired_capacity: %6.1fK"
                              "  maximum_desired_capacity: %6.1fK",
                              capacity_until_GC / (double) K,
                              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_words = 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_words = shrink_words / 100 * current_shrink_factor;
       assert(shrink_words <= max_shrink_words,
         err_msg("invalid shrink size " SIZE_FORMAT " not <= " SIZE_FORMAT,
           shrink_words, max_shrink_words));
       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_words: %.1fK"
                       "  current_shrink_factor: %d"
                       "  new shrink factor: %d"
                       "  MinMetaspaceExpansion: %.1fK",
                       shrink_words / (double) K,
                       current_shrink_factor,
                       _shrink_factor,
                       MinMetaspaceExpansion / (double) K);
       }
     }
   }
   // Don't shrink unless it's significant
   if (shrink_words >= MinMetaspaceExpansion) {
     VirtualSpaceNode* csp = vsl->current_virtual_space();
     size_t available_to_shrink = csp->capacity_words_in_vs() -
       csp->used_words_in_vs();
     shrink_words = MIN2(shrink_words, available_to_shrink);
     csp->shrink_by(shrink_words);
     MetaspaceGC::dec_capacity_until_GC(shrink_words);
     if (PrintGCDetails && Verbose) {
       size_t new_capacity_until_GC = MetaspaceGC::capacity_until_GC_in_bytes();
       gclog_or_tty->print_cr("  metaspace HWM: %.1fK", new_capacity_until_GC / (double) K);
     }
   }
   assert(vsl->used_bytes_sum() == used_after_gc &&
          used_after_gc <= vsl->capacity_bytes_sum(),
          "sanity check");
 }
 // Metadebug methods
 void Metadebug::deallocate_chunk_a_lot(SpaceManager* sm,
                                        size_t chunk_word_size){
 #ifdef ASSERT
   VirtualSpaceList* vsl = sm->vs_list();
   if (MetaDataDeallocateALot &&
       Metadebug::deallocate_chunk_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) {
     Metadebug::reset_deallocate_chunk_a_lot_count();
     for (uint i = 0; i < metadata_deallocate_a_lock_chunk; i++) {
       Metachunk* dummy_chunk = vsl->current_virtual_space()->take_from_committed(chunk_word_size);
       if (dummy_chunk == NULL) {
         break;
       }
       vsl->chunk_manager()->chunk_freelist_deallocate(dummy_chunk);
       if (TraceMetadataChunkAllocation && Verbose) {
         gclog_or_tty->print("Metadebug::deallocate_chunk_a_lot: %d) ",
                                sm->sum_count_in_chunks_in_use());
         dummy_chunk->print_on(gclog_or_tty);
         gclog_or_tty->print_cr("  Free chunks total %d  count %d",
                                vsl->chunk_manager()->free_chunks_total(),
                                vsl->chunk_manager()->free_chunks_count());
       }
     }
   } else {
     Metadebug::inc_deallocate_chunk_a_lot_count();
   }
 #endif
 }
 void Metadebug::deallocate_block_a_lot(SpaceManager* sm,
                                        size_t raw_word_size){
 #ifdef ASSERT
   if (MetaDataDeallocateALot &&
         Metadebug::deallocate_block_a_lot_count() % MetaDataDeallocateALotInterval == 0 ) {
     Metadebug::set_deallocate_block_a_lot_count(0);
     for (uint i = 0; i < metadata_deallocate_a_lot_block; i++) {
       Metablock* dummy_block = sm->allocate_work(raw_word_size);
       if (dummy_block == 0) {
         break;
       }
 #ifdef ASSERT
       assert(dummy_block->word_size() == raw_word_size, "Block size is not set correctly");
 #endif
       sm->deallocate(dummy_block->data());
     }
   } else {
     Metadebug::inc_deallocate_block_a_lot_count();
   }
 #endif
 }
 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
 // ChunkList methods
 size_t ChunkList::sum_list_size() {
   size_t result = 0;
   Metachunk* cur = head();
   while (cur != NULL) {
     result += cur->word_size();
     cur = cur->next();
   }
   return result;
 }
 size_t ChunkList::sum_list_count() {
   size_t result = 0;
   Metachunk* cur = head();
   while (cur != NULL) {
     result++;
     cur = cur->next();
   }
   return result;
 }
 size_t ChunkList::sum_list_capacity() {
   size_t result = 0;
   Metachunk* cur = head();
   while (cur != NULL) {
     result += cur->capacity_word_size();
     cur = cur->next();
   }
   return result;
 }
 void ChunkList::add_at_head(Metachunk* head, Metachunk* tail) {
   assert_lock_strong(SpaceManager::expand_lock());
   assert(tail->next() == NULL, "Not the tail");
   if (TraceMetadataChunkAllocation && Verbose) {
     tty->print("ChunkList::add_at_head: ");
     Metachunk* cur = head;
     while (cur != NULL) {
     tty->print(PTR_FORMAT " (" SIZE_FORMAT ") ", cur, cur->word_size());
       cur = cur->next();
     }
     tty->print_cr("");
   }
   if (tail != NULL) {
     tail->set_next(_head);
   }
   set_head(head);
 }
 void ChunkList::add_at_head(Metachunk* list) {
   if (list == NULL) {
     // Nothing to add
     return;
   }
   assert_lock_strong(SpaceManager::expand_lock());
   Metachunk* head = list;
   Metachunk* tail = list;
   Metachunk* cur = head->next();
   // Search for the tail since it is not passed.
   while (cur != NULL) {
     tail = cur;
     cur = cur->next();
   }
   add_at_head(head, tail);
 }
 // ChunkManager methods
 // Verification of _free_chunks_total and _free_chunks_count does not
 // work with the CMS collector because its use of additional locks
 // complicate the mutex deadlock detection but it can still be useful
 // for detecting errors in the chunk accounting with other collectors.
 size_t ChunkManager::free_chunks_total() {
 #ifdef ASSERT
   if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) {
     MutexLockerEx cl(SpaceManager::expand_lock(),
                      Mutex::_no_safepoint_check_flag);
     locked_verify_free_chunks_total();
   }
 #endif
   return _free_chunks_total;
 }
 size_t ChunkManager::free_chunks_total_in_bytes() {
   return free_chunks_total() * 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
     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() {
 #ifdef ASSERT
   if (!UseConcMarkSweepGC) {
     MutexLockerEx cl(SpaceManager::expand_lock(),
                        Mutex::_no_safepoint_check_flag);
     locked_verify_free_chunks_total();
     locked_verify_free_chunks_count();
   }
 #endif
 }
 void ChunkManager::locked_verify() {
   locked_verify_free_chunks_total();
   locked_verify_free_chunks_count();
 }
 void ChunkManager::locked_print_free_chunks(outputStream* st) {
   assert_lock_strong(SpaceManager::expand_lock());
   st->print_cr("Free chunk total 0x%x  count 0x%x",
                 _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 0x%x  count 0x%x",
                 sum_free_chunks(), sum_free_chunks_count());
 }
 ChunkList* ChunkManager::free_chunks(ChunkIndex 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 = SmallIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
     ChunkList* list = free_chunks(i);
     if (list == NULL) {
       continue;
     }
     result = result + list->sum_list_capacity();
   }
   return result;
 }
 size_t ChunkManager::sum_free_chunks_count() {
   assert_lock_strong(SpaceManager::expand_lock());
   size_t count = 0;
   for (ChunkIndex i = SmallIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
     ChunkList* list = free_chunks(i);
     if (list == NULL) {
       continue;
     }
     count = count + list->sum_list_count();
   }
   return count;
 }
 ChunkList* ChunkManager::find_free_chunks_list(size_t word_size) {
   switch (word_size) {
   case SpaceManager::SmallChunk :
       return &_free_chunks[0];
   case SpaceManager::MediumChunk :
       return &_free_chunks[1];
   default:
     assert(word_size > SpaceManager::MediumChunk, "List inconsistency");
     return &_free_chunks[2];
   }
 }
 void ChunkManager::free_chunks_put(Metachunk* chunk) {
   assert_lock_strong(SpaceManager::expand_lock());
   ChunkList* free_list = find_free_chunks_list(chunk->word_size());
   chunk->set_next(free_list->head());
   free_list->set_head(chunk);
   // chunk is being returned to the chunk free list
   inc_free_chunks_total(chunk->capacity_word_size());
   locked_verify();
 }
 void ChunkManager::chunk_freelist_deallocate(Metachunk* chunk) {
   // The deallocation of a chunk originates in the freelist
   // manangement code for a Metaspace and does not hold the
   // lock.
   assert(chunk != NULL, "Deallocating NULL");
   // MutexLockerEx fcl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
   locked_verify();
   if (TraceMetadataChunkAllocation) {
     tty->print_cr("ChunkManager::chunk_freelist_deallocate: chunk "
                   PTR_FORMAT "  size " SIZE_FORMAT,
                   chunk, chunk->word_size());
   }
   free_chunks_put(chunk);
 }
 Metachunk* ChunkManager::free_chunks_get(size_t word_size) {
   assert_lock_strong(SpaceManager::expand_lock());
   locked_verify();
   ChunkList* free_list = find_free_chunks_list(word_size);
   assert(free_list != NULL, "Sanity check");
   Metachunk* chunk = free_list->head();
   debug_only(Metachunk* debug_head = chunk;)
   if (chunk == NULL) {
     return NULL;
   }
   Metachunk* prev_chunk = chunk;
   if (chunk->word_size() == word_size) {
     // Chunk is being removed from the chunks free list.
     dec_free_chunks_total(chunk->capacity_word_size());
     // Remove the chunk as the head of the list.
     free_list->set_head(chunk->next());
     chunk->set_next(NULL);
     if (TraceMetadataChunkAllocation && Verbose) {
       tty->print_cr("ChunkManager::free_chunks_get: free_list "
                     PTR_FORMAT " head " PTR_FORMAT " size " SIZE_FORMAT,
                     free_list, chunk, chunk->word_size());
     }
   } else {
     assert(SpaceManager::is_humongous(word_size),
       "Should only need to check humongous");
     // This code to find the best fit is just for purposes of
     // investigating the loss due to fragmentation on a humongous
     // chunk.  It will be replace by a binaryTreeDictionary for
     // the humongous chunks.
     uint count = 0;
     Metachunk* best_fit = NULL;
     Metachunk* best_fit_prev = NULL;
     while (chunk != NULL) {
       count++;
       if (chunk->word_size() < word_size) {
         prev_chunk = chunk;
         chunk = chunk->next();
       } else if (chunk->word_size() == word_size) {
         break;
       } else {
         if (best_fit == NULL ||
             best_fit->word_size() > chunk->word_size()) {
           best_fit_prev = prev_chunk;
           best_fit = chunk;
         }
         prev_chunk = chunk;
         chunk = chunk->next();
       }
     }
       if (chunk == NULL) {
         prev_chunk = best_fit_prev;
         chunk = best_fit;
       }
       if (chunk != NULL) {
         if (TraceMetadataHumongousAllocation) {
           size_t waste = chunk->word_size() - word_size;
           tty->print_cr("Free list allocate humongous chunk size " SIZE_FORMAT
                         " for requested size " SIZE_FORMAT
                         " waste " SIZE_FORMAT
                         " found at " SIZE_FORMAT " of " SIZE_FORMAT,
                         chunk->word_size(), word_size, waste,
                         count, free_list->sum_list_count());
         }
         // Chunk is being removed from the chunks free list.
         dec_free_chunks_total(chunk->capacity_word_size());
         // Remove the chunk if it is at the head of the list.
         if (chunk == free_list->head()) {
           free_list->set_head(chunk->next());
           if (TraceMetadataHumongousAllocation) {
             tty->print_cr("ChunkManager::free_chunks_get: humongous free_list "
                           PTR_FORMAT " chunk " PTR_FORMAT " size " SIZE_FORMAT
                           " new head " PTR_FORMAT,
                           free_list, chunk, chunk->word_size(),
                           free_list->head());
           }
         } else {
           // Remove a chunk in the interior of the list
           prev_chunk->set_next(chunk->next());
           if (TraceMetadataHumongousAllocation) {
             tty->print_cr("ChunkManager::free_chunks_get: humongous free_list "
                           PTR_FORMAT " chunk " PTR_FORMAT " size " SIZE_FORMAT
                           PTR_FORMAT "  prev " PTR_FORMAT " next " PTR_FORMAT,
                           free_list, chunk, chunk->word_size(),
                           prev_chunk, chunk->next());
           }
         }
         chunk->set_next(NULL);
       } else {
         if (TraceMetadataHumongousAllocation) {
           tty->print_cr("ChunkManager::free_chunks_get: New humongous chunk of size "
                         SIZE_FORMAT,
                         word_size);
         }
       }
   }
   locked_verify();
   return chunk;
 }
 Metachunk* ChunkManager::chunk_freelist_allocate(size_t word_size) {
   assert_lock_strong(SpaceManager::expand_lock());
   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() ||
            SpaceManager::is_humongous(chunk->word_size()),
            "Non-humongous variable sized chunk");
   if (TraceMetadataChunkAllocation) {
     tty->print("ChunkManager::chunk_freelist_allocate: chunk "
                PTR_FORMAT "  size " SIZE_FORMAT " ",
                chunk, chunk->word_size());
     locked_print_free_chunks(tty);
   }
   return chunk;
 }
 // SpaceManager methods
 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 = SmallIndex; i < NumberOfFreeLists; 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 = SmallIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
    // Count the free space in all the chunk but not the
    // current chunk from which allocations are still being done.
    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;
   size_t count = 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.
   if (chunk != NULL) {
     while (chunk != NULL) {
       if (chunk != current_chunk()) {
         result += chunk->free_word_size();
       }
       chunk = chunk->next();
       count++;
     }
   }
   return result;
 }
 size_t SpaceManager::sum_capacity_in_chunks_in_use() const {
   MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
   size_t sum = 0;
   for (ChunkIndex i = SmallIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
     Metachunk* chunk = chunks_in_use(i);
     while (chunk != NULL) {
       // Just changed this sum += chunk->capacity_word_size();
       // sum += chunk->word_size() - Metachunk::overhead();
       sum += chunk->capacity_word_size();
       chunk = chunk->next();
     }
   }
   return sum;
 }
 size_t SpaceManager::sum_count_in_chunks_in_use() {
   size_t count = 0;
   for (ChunkIndex i = SmallIndex; i < NumberOfFreeLists; 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 = SmallIndex; i < NumberOfFreeLists; 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 {
   Metachunk* small_chunk = chunks_in_use(SmallIndex);
   st->print_cr("SpaceManager: small chunk " PTR_FORMAT
                " free " SIZE_FORMAT,
                small_chunk,
                small_chunk->free_word_size());
   Metachunk* medium_chunk = chunks_in_use(MediumIndex);
   st->print("medium chunk " PTR_FORMAT, medium_chunk);
   Metachunk* tail = current_chunk();
   st->print_cr(" current chunk " PTR_FORMAT, tail);
   Metachunk* head = chunks_in_use(HumongousIndex);
   st->print_cr("humongous chunk " PTR_FORMAT, head);
   vs_list()->chunk_manager()->locked_print_free_chunks(st);
   vs_list()->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 &&
       (!has_small_chunk_limit() ||
        sum_count_in_chunks_in_use(SmallIndex) < _small_chunk_limit)) {
     chunk_word_size = (size_t) SpaceManager::SmallChunk;
     if (word_size + Metachunk::overhead() > SpaceManager::SmallChunk) {
       chunk_word_size = MediumChunk;
     }
   } else {
     chunk_word_size = MediumChunk;
   }
   // Might still need a humongous chunk
   chunk_word_size =
     MAX2((size_t) chunk_word_size, word_size + Metachunk::overhead());
   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("    block overhead " PTR_FORMAT
                            " chunk overhead " PTR_FORMAT,
                            Metablock::overhead(),
                            Metachunk::overhead());
   }
   return chunk_word_size;
 }
 Metablock* 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) {
     gclog_or_tty->print_cr("SpaceManager::grow_and_allocate for " SIZE_FORMAT
                            " words " SIZE_FORMAT " space left",
                             word_size, current_chunk() != NULL ?
                               current_chunk()->free_word_size() : 0);
   }
   // Get another chunk out of the virtual space
   size_t grow_chunks_by_words = calc_chunk_size(word_size);
   Metachunk* next = vs_list()->get_new_chunk(word_size, grow_chunks_by_words);
   // If a chunk was available, add it to the in-use chunk list
   // and do an allocation from it.
   if (next != NULL) {
     Metadebug::deallocate_chunk_a_lot(this, grow_chunks_by_words);
     // Add to this manager's list of chunks in use.
     add_chunk(next, false);
     return next->allocate(word_size);
   }
   return NULL;
 }
 void SpaceManager::print_on(outputStream* st) const {
   for (ChunkIndex i = SmallIndex;
        i < NumberOfFreeLists ;
        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));
   // Nothing in them yet
   // block_freelists()->print_on(st);
 }
 SpaceManager::SpaceManager(Mutex* lock, VirtualSpaceList* vs_list) :
   _vs_list(vs_list),
   _allocation_total(0),
   _lock(lock) {
   Metadebug::init_allocation_fail_alot_count();
   for (ChunkIndex i = SmallIndex; i < NumberOfFreeLists; 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);
   }
 }
 SpaceManager::~SpaceManager() {
   MutexLockerEx fcl(SpaceManager::expand_lock(),
                     Mutex::_no_safepoint_check_flag);
   ChunkManager* chunk_manager = vs_list()->chunk_manager();
   chunk_manager->locked_verify();
   if (TraceMetadataChunkAllocation && Verbose) {
     gclog_or_tty->print_cr("~SpaceManager(): " PTR_FORMAT, this);
     locked_print_chunks_in_use_on(gclog_or_tty);
   }
   // Have to update before the chunks_in_use lists are emptied
   // below.
   chunk_manager->inc_free_chunks_total(sum_capacity_in_chunks_in_use(),
                                        sum_count_in_chunks_in_use());
 #ifdef ASSERT
   // Mangle freed memory.
   mangle_freed_chunks();
 #endif // ASSERT
   // Add all the chunks in use by this space manager
   // to the global list of free chunks.
   // Small chunks.  There is one _current_chunk for each
   // Metaspace.  It could point to a small or medium chunk.
   // Rather than determine which it is, follow the list of
   // small chunks to add them to the free list
   Metachunk* small_chunk = chunks_in_use(SmallIndex);
   chunk_manager->free_small_chunks()->add_at_head(small_chunk);
   set_chunks_in_use(SmallIndex, NULL);
   // After the small chunk are the medium chunks
   Metachunk* medium_chunk = chunks_in_use(MediumIndex);
   assert(medium_chunk == NULL ||
          medium_chunk->word_size() == MediumChunk,
          "Chunk is on the wrong list");
   if (medium_chunk != NULL) {
     Metachunk* head = medium_chunk;
     // If there is a medium chunk then the _current_chunk can only
     // point to the last medium chunk.
     Metachunk* tail = current_chunk();
     chunk_manager->free_medium_chunks()->add_at_head(head, tail);
     set_chunks_in_use(MediumIndex, NULL);
   }
   // Humongous chunks
   // Humongous chunks are never the current chunk.
   Metachunk* humongous_chunks = chunks_in_use(HumongousIndex);
   if (humongous_chunks != NULL) {
     chunk_manager->free_humongous_chunks()->add_at_head(humongous_chunks);
     set_chunks_in_use(HumongousIndex, NULL);
   }
   chunk_manager->locked_verify();
 }
 void SpaceManager::deallocate(MetaWord* p) {
   assert_lock_strong(_lock);
   ShouldNotReachHere();  // Where is this needed.
 #ifdef DEALLOCATE_BLOCKS
   Metablock* block = Metablock::metablock_from_data(p);
   // This is expense but kept it until integration JJJ
   assert(contains((address)block), "Block does not belong to this metaspace");
   block_freelists()->return_block(block, word_size);
 #endif
 }
 // 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.
   switch (new_chunk->word_size()) {
   case SpaceManager::SmallChunk :
     if (chunks_in_use(SmallIndex) == NULL) {
       // First chunk to add to the list
       set_chunks_in_use(SmallIndex, new_chunk);
     } else {
       assert(current_chunk()->word_size() == SpaceManager::SmallChunk,
         err_msg( "Incorrect mix of sizes in chunk list "
         SIZE_FORMAT " new chunk " SIZE_FORMAT,
         current_chunk()->word_size(), new_chunk->word_size()));
       current_chunk()->set_next(new_chunk);
     }
     // Make current chunk
     set_current_chunk(new_chunk);
     break;
   case SpaceManager::MediumChunk :
     if (chunks_in_use(MediumIndex) == NULL) {
       // About to add the first medium chunk so teminate the
       // small chunk list.  In general once medium chunks are
       // being added, we're past the need for small chunks.
       if (current_chunk() != NULL) {
         // Only a small chunk or the initial chunk could be
         // the current chunk if this is the first medium chunk.
         assert(current_chunk()->word_size() == SpaceManager::SmallChunk ||
           chunks_in_use(SmallIndex) == NULL,
           err_msg("Should be a small chunk or initial chunk, current chunk "
           SIZE_FORMAT " new chunk " SIZE_FORMAT,
           current_chunk()->word_size(), new_chunk->word_size()));
         current_chunk()->set_next(NULL);
       }
       // First chunk to add to the list
       set_chunks_in_use(MediumIndex, new_chunk);
     } else {
       // As a minimum the first medium chunk added would
       // have become the _current_chunk
       // so the _current_chunk has to be non-NULL here
       // (although not necessarily still the first medium chunk).
       assert(current_chunk()->word_size() == SpaceManager::MediumChunk,
              "A medium chunk should the current chunk");
       current_chunk()->set_next(new_chunk);
     }
     // Make current chunk
     set_current_chunk(new_chunk);
     break;
   default: {
     // 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() > MediumChunk, "List inconsistency");
   }
   }
   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);
     vs_list()->chunk_manager()->locked_print_free_chunks(tty);
   }
 }
 MetaWord* SpaceManager::allocate(size_t word_size) {
   MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
   size_t block_overhead = Metablock::overhead();
   // If only the dictionary is going to be used (i.e., no
   // indexed free list), then there is a minimum size requirement.
   // MinChunkSize is a placeholder for the real minimum size JJJ
   size_t byte_size_with_overhead = (word_size + block_overhead) * BytesPerWord;
 #ifdef DEALLOCATE_BLOCKS
   size_t raw_bytes_size = MAX2(ARENA_ALIGN(byte_size_with_overhead),
                                MinChunkSize * BytesPerWord);
 #else
   size_t raw_bytes_size = ARENA_ALIGN(byte_size_with_overhead);
 #endif
   size_t raw_word_size = raw_bytes_size / BytesPerWord;
   assert(raw_word_size * BytesPerWord == raw_bytes_size, "Size problem");
   BlockFreelist* fl =  block_freelists();
   Metablock* block = 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->totalSize() > allocation_from_dictionary_limit) {
     block = fl->get_block(raw_word_size);
   }
   if (block == NULL) {
     block = allocate_work(raw_word_size);
     if (block == NULL) {
       return NULL;
     }
   }
   Metadebug::deallocate_block_a_lot(this, raw_word_size);
   // Push the allocation past the word containing the size and leader.
 #ifdef ASSERT
   MetaWord* result =  block->data();
   return result;
 #else
   return (MetaWord*) block;
 #endif
 }
 // Returns the address of spaced allocated for "word_size".
 // This methods does not know about blocks (Metablocks)
 Metablock* 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?
   Metablock* 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_allocation_total(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 > 0) {
     inc_allocation_total(word_size);
     assert(result != (Metablock*) chunks_in_use(MediumIndex), "Head of the list is being allocated");
     assert(result->word_size() == word_size, "Size not set correctly");
   }
   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()->totalSize() == 0) {
     // Skip the small chunks because their next link points to
     // medium chunks.  This is because the small chunk is the
     // current chunk (for allocations) until it is full and the
     // the addition of the next chunk does not NULL the next
     // like of the small chunk.
     for (ChunkIndex i = MediumIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
       Metachunk* curr = chunks_in_use(i);
       while (curr != NULL) {
         curr->verify();
         curr = curr->next();
       }
     }
   }
 }
 #ifdef ASSERT
 void SpaceManager::verify_allocation_total() {
 #if 0
   // Verification is only guaranteed at a safepoint.
   if (SafepointSynchronize::is_at_safepoint()) {
     gclog_or_tty->print_cr("Chunk " PTR_FORMAT " allocation_total " SIZE_FORMAT
                            " sum_used_in_chunks_in_use " SIZE_FORMAT,
                            this,
                            allocation_total(),
                            sum_used_in_chunks_in_use());
   }
   MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
   assert(allocation_total() == sum_used_in_chunks_in_use(),
     err_msg("allocation total is not consistent %d vs %d",
             allocation_total(), sum_used_in_chunks_in_use()));
 #endif
 }
 #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 = SmallIndex;
        index < NumberOfFreeLists;
        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);
       if (TraceMetadataChunkAllocation && Verbose) {
         block_freelists()->print_on(out);
       }
       curr_total += curr->word_size();
       used += curr->used_word_size();
       capacity += curr->capacity_word_size();
       waste += curr->free_word_size() + curr->overhead();;
     }
   }
   size_t free = 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 = SmallIndex;
        index < NumberOfFreeLists;
        index = next_chunk_index(index)) {
     for (Metachunk* curr = chunks_in_use(index);
          curr != NULL;
          curr = curr->next()) {
       // Try to detect incorrectly terminated small chunk
       // list.
       assert(index == MediumIndex || curr != chunks_in_use(MediumIndex),
              err_msg("Mangling medium chunks in small chunks? "
                      "curr " PTR_FORMAT " medium list " PTR_FORMAT,
                      curr, chunks_in_use(MediumIndex)));
       curr->mangle();
     }
   }
 }
 #endif // PRODUCT
 // MetaspaceAux
 size_t MetaspaceAux::used_in_bytes(Metaspace::MetadataType mdtype) {
   size_t used = 0;
 #ifdef ASSERT
   size_t free = 0;
   size_t capacity = 0;
 #endif
   ClassLoaderDataGraphMetaspaceIterator iter;
   while (iter.repeat()) {
     Metaspace* msp = iter.get_next();
     // Sum allocation_total for each metaspace
     if (msp != NULL) {
       used += msp->used_words(mdtype);
 #ifdef ASSERT
       free += msp->free_words(mdtype);
       capacity += msp->capacity_words(mdtype);
       assert(used + free == capacity,
         err_msg("Accounting is wrong used " SIZE_FORMAT
                 " free " SIZE_FORMAT " capacity " SIZE_FORMAT,
                 used, free, capacity));
 #endif
     }
   }
   return used * BytesPerWord;
 }
 size_t MetaspaceAux::free_in_bytes(Metaspace::MetadataType mdtype) {
   size_t free = 0;
   ClassLoaderDataGraphMetaspaceIterator iter;
   while (iter.repeat()) {
     Metaspace* msp = iter.get_next();
     if (msp != NULL) {
       free += msp->free_words(mdtype);
     }
   }
   return free * BytesPerWord;
 }
 // The total words available for metadata allocation.  This
 // uses Metaspace capacity_words() which is the total words
 // in chunks allocated for a Metaspace.
 size_t MetaspaceAux::capacity_in_bytes(Metaspace::MetadataType mdtype) {
   size_t capacity = free_chunks_total(mdtype);
   ClassLoaderDataGraphMetaspaceIterator iter;
   while (iter.repeat()) {
     Metaspace* msp = iter.get_next();
     if (msp != NULL) {
       capacity += msp->capacity_words(mdtype);
     }
   }
   return capacity * BytesPerWord;
 }
 size_t MetaspaceAux::reserved_in_bytes(Metaspace::MetadataType mdtype) {
   size_t reserved = (mdtype == Metaspace::ClassType) ?
                        Metaspace::class_space_list()->virtual_space_total() :
                        Metaspace::space_list()->virtual_space_total();
   return reserved * BytesPerWord;
 }
 size_t MetaspaceAux::min_chunk_size() { return SpaceManager::MediumChunk; }
 size_t MetaspaceAux::free_chunks_total(Metaspace::MetadataType mdtype) {
   ChunkManager* chunk = (mdtype == Metaspace::ClassType) ?
                             Metaspace::class_space_list()->chunk_manager() :
                             Metaspace::space_list()->chunk_manager();
   chunk->verify_free_chunks_total();
   return chunk->free_chunks_total();
 }
 size_t MetaspaceAux::free_chunks_total_in_bytes(Metaspace::MetadataType mdtype) {
   return free_chunks_total(mdtype) * BytesPerWord;
 }
 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 "/" SIZE_FORMAT ")",
                         prev_metadata_used,
                         used_in_bytes(),
                         capacity_in_bytes(),
                         reserved_in_bytes());
   } else {
     gclog_or_tty->print(" "  SIZE_FORMAT "K"
                         "->" SIZE_FORMAT "K"
                         "("  SIZE_FORMAT "K/" SIZE_FORMAT "K)",
                         prev_metadata_used / K,
                         used_in_bytes()/ K,
                         capacity_in_bytes()/K,
                         reserved_in_bytes()/ K);
   }
   gclog_or_tty->print("]");
 }
 // This is printed when PrintGCDetails
 void MetaspaceAux::print_on(outputStream* out) {
   Metaspace::MetadataType ct = Metaspace::ClassType;
   Metaspace::MetadataType nct = Metaspace::NonClassType;
   out->print_cr(" Metaspace total "
                 SIZE_FORMAT "K, used " SIZE_FORMAT "K,"
                 " reserved " SIZE_FORMAT "K",
                 capacity_in_bytes()/K, used_in_bytes()/K, reserved_in_bytes()/K);
   out->print_cr("  data space     "
                 SIZE_FORMAT "K, used " SIZE_FORMAT "K,"
                 " reserved " SIZE_FORMAT "K",
                 capacity_in_bytes(nct)/K, used_in_bytes(nct)/K, reserved_in_bytes(nct)/K);
   out->print_cr("  class space    "
                 SIZE_FORMAT "K, used " SIZE_FORMAT "K,"
                 " reserved " SIZE_FORMAT "K",
                 capacity_in_bytes(ct)/K, used_in_bytes(ct)/K, reserved_in_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_in_bytes(mdtype);
   size_t capacity_bytes = capacity_in_bytes(mdtype);
   size_t used_bytes = used_in_bytes(mdtype);
   size_t free_bytes = free_in_bytes(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);
   assert(used_and_free == capacity_bytes, "Accounting is wrong");
 }
 // Print total fragmentation for class and data metaspaces separately
 void MetaspaceAux::print_waste(outputStream* out) {
   size_t small_waste = 0, medium_waste = 0, large_waste = 0;
   size_t cls_small_waste = 0, cls_medium_waste = 0, cls_large_waste = 0;
   ClassLoaderDataGraphMetaspaceIterator iter;
   while (iter.repeat()) {
     Metaspace* msp = iter.get_next();
     if (msp != NULL) {
       small_waste += msp->vsm()->sum_waste_in_chunks_in_use(SmallIndex);
       medium_waste += msp->vsm()->sum_waste_in_chunks_in_use(MediumIndex);
       large_waste += msp->vsm()->sum_waste_in_chunks_in_use(HumongousIndex);
       cls_small_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SmallIndex);
       cls_medium_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(MediumIndex);
       cls_large_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(HumongousIndex);
     }
   }
   out->print_cr("Total fragmentation waste (words) doesn't count free space");
   out->print("  data: small " SIZE_FORMAT " medium " SIZE_FORMAT,
              small_waste, medium_waste);
   out->print_cr(" class: small " SIZE_FORMAT, cls_small_waste);
 }
 // 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);
 }
 // Metaspace methods
 size_t Metaspace::_first_chunk_word_size = 0;
 Metaspace::Metaspace(Mutex* lock, size_t word_size) {
   initialize(lock, word_size);
 }
 Metaspace::Metaspace(Mutex* lock) {
   initialize(lock);
 }
 Metaspace::~Metaspace() {
   delete _vsm;
   delete _class_vsm;
 }
 VirtualSpaceList* Metaspace::_space_list = NULL;
 VirtualSpaceList* Metaspace::_class_space_list = NULL;
 #define VIRTUALSPACEMULTIPLIER 2
 void Metaspace::global_initialize() {
   // Initialize the alignment for shared spaces.
   int max_alignment = os::vm_page_size();
   MetaspaceShared::set_max_alignment(max_alignment);
   if (DumpSharedSpaces) {
     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);
     // 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.
     size_t total = align_size_up(SharedReadOnlySize + SharedReadWriteSize +
                                  SharedMiscDataSize + SharedMiscCodeSize,
                                  os::vm_allocation_granularity());
     size_t word_size = total/wordSize;
     _space_list = new VirtualSpaceList(word_size);
   } else {
     // 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)
     if (UseSharedSpaces) {
       FileMapInfo* mapinfo = new FileMapInfo();
       memset(mapinfo, 0, sizeof(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)) {
         FileMapInfo::set_current_info(mapinfo);
       } else {
         assert(!mapinfo->is_open() && !UseSharedSpaces,
                "archive file not closed or shared spaces not disabled.");
       }
     }
     // Initialize this before initializing the VirtualSpaceList
     _first_chunk_word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord;
     // Arbitrarily set the initial virtual space to a multiple
     // of the boot class loader size.
     size_t word_size = VIRTUALSPACEMULTIPLIER * Metaspace::first_chunk_word_size();
     // Initialize the list of virtual spaces.
     _space_list = new VirtualSpaceList(word_size);
   }
 }
 // For UseCompressedKlassPointers the class space is reserved as a piece of the
 // Java heap because the compression algorithm is the same for each.  The
 // argument passed in is at the top 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() >= ClassMetaspaceSize, err_msg("%d != %d", rs.size(), ClassMetaspaceSize));
   _class_space_list = new VirtualSpaceList(rs);
 }
 // Class space probably needs a lot less than data space
 const int class_space_divisor = 4;
 void Metaspace::initialize(Mutex* lock, size_t initial_size) {
   // Use SmallChunk size if not specified, adjust class to smaller size if so.
   size_t word_size;
   size_t class_word_size;
   if (initial_size == 0) {
     word_size = (size_t) SpaceManager::SmallChunk;
     class_word_size = word_size;
   } else {
     word_size = initial_size;
     class_word_size = initial_size/class_space_divisor;
   }
   assert(space_list() != NULL,
     "Metadata VirtualSpaceList has not been initialized");
   _vsm = new SpaceManager(lock, space_list());
   if (_vsm == NULL) {
     return;
   }
   assert(class_space_list() != NULL,
     "Class VirtualSpaceList has not been initialized");
   // Allocate SpaceManager for classes.
   _class_vsm = new SpaceManager(lock, class_space_list());
   if (_class_vsm == NULL) {
     return;
   }
   MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
   // Allocate chunk for metadata objects
   Metachunk* new_chunk =
      space_list()->current_virtual_space()->get_chunk_vs_with_expand(word_size);
   assert(!DumpSharedSpaces || new_chunk != NULL, "should have enough space for both chunks");
   if (new_chunk != NULL) {
     // Add to this manager's list of chunks in use and current_chunk().
     vsm()->add_chunk(new_chunk, true);
   }
   // Allocate chunk for class metadata objects
   Metachunk* class_chunk =
      class_space_list()->current_virtual_space()->get_chunk_vs_with_expand(class_word_size);
   if (class_chunk != NULL) {
     class_vsm()->add_chunk(class_chunk, true);
   }
 }
 MetaWord* Metaspace::allocate(size_t word_size, MetadataType mdtype) {
   // DumpSharedSpaces doesn't use class metadata area (yet)
   if (mdtype == ClassType && !DumpSharedSpaces) {
     return class_vsm()->allocate(word_size);
   } else {
     return vsm()->allocate(word_size);
   }
 }
 // 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(MetadataType mdtype) const {
   // return vsm()->allocation_total();
   return mdtype == ClassType ? class_vsm()->sum_used_in_chunks_in_use() :
                                vsm()->sum_used_in_chunks_in_use();  // includes overhead!
 }
 size_t Metaspace::free_words(MetadataType mdtype) const {
   return mdtype == ClassType ? class_vsm()->sum_free_in_chunks_in_use() :
                                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(MetadataType mdtype) const {
   return mdtype == ClassType ? class_vsm()->sum_capacity_in_chunks_in_use() :
                                vsm()->sum_capacity_in_chunks_in_use();
 }
 void Metaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) {
   if (SafepointSynchronize::is_at_safepoint()) {
     assert(Thread::current()->is_VM_thread(), "should be the VM thread");
     // Don't take lock
 #ifdef DEALLOCATE_BLOCKS
     if (is_class) {
       class_vsm()->deallocate(ptr);
     } else {
       vsm()->deallocate(ptr);
     }
 #else
 #ifdef ASSERT
     Copy::fill_to_words((HeapWord*)ptr, word_size, metadata_deallocate);
 #endif
 #endif
   } else {
     MutexLocker ml(vsm()->lock());
 #ifdef DEALLOCATE_BLOCKS
     if (is_class) {
       class_vsm()->deallocate(ptr);
     } else {
       vsm()->deallocate(ptr);
     }
 #else
 #ifdef ASSERT
     Copy::fill_to_words((HeapWord*)ptr, word_size, metadata_deallocate);
 #endif
 #endif
   }
 }
 MetaWord* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size,
                               bool read_only, MetadataType mdtype, TRAPS) {
   if (HAS_PENDING_EXCEPTION) {
     assert(false, "Should not allocate with exception pending");
     return NULL;  // caller does a CHECK_NULL too
   }
   // SSS: Should we align the allocations and make sure the sizes are aligned.
   MetaWord* result = NULL;
   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) {
     if (read_only) {
       result = loader_data->ro_metaspace()->allocate(word_size, NonClassType);
     } else {
       result = loader_data->rw_metaspace()->allocate(word_size, NonClassType);
     }
     if (result == NULL) {
       report_out_of_shared_space(read_only ? SharedReadOnly : SharedReadWrite);
     }
     return result;
   }
   result = loader_data->metaspace_non_null()->allocate(word_size, mdtype);
   if (result == NULL) {
     // Try to clean out some memory and retry.
     result =
     Universe::heap()->collector_policy()->satisfy_failed_metadata_allocation(
         loader_data, word_size, mdtype);
     // If result is still null, we are out of memory.
     if (result == NULL) {
       // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support
       report_java_out_of_memory("Metadata space");
       if (JvmtiExport::should_post_resource_exhausted()) {
         JvmtiExport::post_resource_exhausted(
             JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR,
             "Metadata space");
       }
       THROW_OOP_0(Universe::out_of_memory_error_perm_gen());
     }
   }
   return result;
 }
 void Metaspace::print_on(outputStream* out) const {
   // Print both class virtual space counts and metaspace.
   if (Verbose) {
       vsm()->print_on(out);
       class_vsm()->print_on(out);
   }
 }
 #ifndef PRODUCT
 bool Metaspace::contains(const void * ptr) const {
   if (MetaspaceShared::is_in_shared_space(ptr)) {
     return true;
   }
   MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
   return space_list()->contains(ptr) || class_space_list()->contains(ptr);
 }
 #endif
 void Metaspace::verify() {
   vsm()->verify();
   class_vsm()->verify();
 }
 void Metaspace::dump(outputStream* const out) const {
   if (UseMallocOnly) {
     // Just print usage for now
     out->print_cr("usage %d", used_words(Metaspace::NonClassType));
   }
   out->print_cr("\nVirtual space manager: " INTPTR_FORMAT, vsm());
   vsm()->dump(out);
   out->print_cr("\nClass space manager: " INTPTR_FORMAT, class_vsm());
   class_vsm()->dump(out);
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/memory/metaspace.cpp@03049e0e8544 (annotated)

src/share/vm/memory/metaspace.cpp