jdk-sandbox: comparison hotspot/src/share/vm/memory/metaspace.cpp

equal deleted inserted replaced

-:caf5eb7dd4a7
+:882756847a04
+/*
+* 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 =
+1+(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);
+}

changeset 13728	882756847a04
child 13729	3826a6124401