coleenp@4037: /*
drchase@6680:  * Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved.
coleenp@4037:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
coleenp@4037:  *
coleenp@4037:  * This code is free software; you can redistribute it and/or modify it
coleenp@4037:  * under the terms of the GNU General Public License version 2 only, as
coleenp@4037:  * published by the Free Software Foundation.
coleenp@4037:  *
coleenp@4037:  * This code is distributed in the hope that it will be useful, but WITHOUT
coleenp@4037:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
coleenp@4037:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
coleenp@4037:  * version 2 for more details (a copy is included in the LICENSE file that
coleenp@4037:  * accompanied this code).
coleenp@4037:  *
coleenp@4037:  * You should have received a copy of the GNU General Public License version
coleenp@4037:  * 2 along with this work; if not, write to the Free Software Foundation,
coleenp@4037:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
coleenp@4037:  *
coleenp@4037:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
coleenp@4037:  * or visit www.oracle.com if you need additional information or have any
coleenp@4037:  * questions.
coleenp@4037:  *
coleenp@4037:  */
coleenp@4037: #include "precompiled.hpp"
coleenp@4037: #include "gc_interface/collectedHeap.hpp"
stefank@5771: #include "memory/allocation.hpp"
coleenp@4037: #include "memory/binaryTreeDictionary.hpp"
jmasa@4196: #include "memory/freeList.hpp"
coleenp@4037: #include "memory/collectorPolicy.hpp"
coleenp@4037: #include "memory/filemap.hpp"
coleenp@4037: #include "memory/freeList.hpp"
stefank@5863: #include "memory/gcLocker.hpp"
jmasa@4196: #include "memory/metachunk.hpp"
coleenp@4037: #include "memory/metaspace.hpp"
ehelin@6417: #include "memory/metaspaceGCThresholdUpdater.hpp"
coleenp@4037: #include "memory/metaspaceShared.hpp"
ehelin@6417: #include "memory/metaspaceTracer.hpp"
coleenp@4037: #include "memory/resourceArea.hpp"
coleenp@4037: #include "memory/universe.hpp"
stefank@5863: #include "runtime/atomic.inline.hpp"
coleenp@4037: #include "runtime/globals.hpp"
stefank@5863: #include "runtime/init.hpp"
hseigel@5528: #include "runtime/java.hpp"
coleenp@4037: #include "runtime/mutex.hpp"
goetz@6911: #include "runtime/orderAccess.inline.hpp"
coleenp@4037: #include "services/memTracker.hpp"
stefank@5864: #include "services/memoryService.hpp"
coleenp@4037: #include "utilities/copy.hpp"
coleenp@4037: #include "utilities/debug.hpp"
coleenp@4037: 
drchase@6680: PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
drchase@6680: 
goetz@6337: typedef BinaryTreeDictionary<Metablock, FreeList<Metablock> > BlockTreeDictionary;
goetz@6337: typedef BinaryTreeDictionary<Metachunk, FreeList<Metachunk> > ChunkTreeDictionary;
stefank@5941: 
stefank@5941: // Set this constant to enable slow integrity checking of the free chunk lists
mgerdin@4264: const bool metaspace_slow_verify = false;
mgerdin@4264: 
mgerdin@5699: size_t const allocation_from_dictionary_limit = 4 * K;
coleenp@4037: 
coleenp@4037: MetaWord* last_allocated = 0;
coleenp@4037: 
coleenp@6029: size_t Metaspace::_compressed_class_space_size;
ehelin@6417: const MetaspaceTracer* Metaspace::_tracer = NULL;
hseigel@5528: 
coleenp@4037: // Used in declarations in SpaceManager and ChunkManager
coleenp@4037: enum ChunkIndex {
jmasa@4382:   ZeroIndex = 0,
jmasa@4382:   SpecializedIndex = ZeroIndex,
jmasa@4382:   SmallIndex = SpecializedIndex + 1,
jmasa@4382:   MediumIndex = SmallIndex + 1,
jmasa@4382:   HumongousIndex = MediumIndex + 1,
jmasa@4382:   NumberOfFreeLists = 3,
jmasa@4382:   NumberOfInUseLists = 4
jmasa@4382: };
jmasa@4382: 
jmasa@4382: enum ChunkSizes {    // in words.
jmasa@4382:   ClassSpecializedChunk = 128,
jmasa@4382:   SpecializedChunk = 128,
jmasa@4382:   ClassSmallChunk = 256,
jmasa@4382:   SmallChunk = 512,
coleenp@5337:   ClassMediumChunk = 4 * K,
mgerdin@6004:   MediumChunk = 8 * K
coleenp@4037: };
coleenp@4037: 
coleenp@4037: static ChunkIndex next_chunk_index(ChunkIndex i) {
jmasa@4196:   assert(i < NumberOfInUseLists, "Out of bound");
coleenp@4037:   return (ChunkIndex) (i+1);
coleenp@4037: }
coleenp@4037: 
stefank@5863: volatile intptr_t MetaspaceGC::_capacity_until_GC = 0;
coleenp@4037: uint MetaspaceGC::_shrink_factor = 0;
coleenp@4037: bool MetaspaceGC::_should_concurrent_collect = false;
coleenp@4037: 
jmasa@4932: typedef class FreeList<Metachunk> ChunkList;
coleenp@4037: 
coleenp@4037: // Manages the global free lists of chunks.
stefank@5771: class ChunkManager : public CHeapObj<mtInternal> {
mgerdin@6004:   friend class TestVirtualSpaceNodeTest;
coleenp@4037: 
coleenp@4037:   // Free list of chunks of different sizes.
jmasa@5007:   //   SpecializedChunk
coleenp@4037:   //   SmallChunk
coleenp@4037:   //   MediumChunk
coleenp@4037:   //   HumongousChunk
jmasa@4196:   ChunkList _free_chunks[NumberOfFreeLists];
jmasa@4196: 
jmasa@4196:   //   HumongousChunk
jmasa@4196:   ChunkTreeDictionary _humongous_dictionary;
coleenp@4037: 
coleenp@4037:   // ChunkManager in all lists of this type
coleenp@4037:   size_t _free_chunks_total;
coleenp@4037:   size_t _free_chunks_count;
coleenp@4037: 
coleenp@4037:   void dec_free_chunks_total(size_t v) {
coleenp@4037:     assert(_free_chunks_count > 0 &&
coleenp@4037:              _free_chunks_total > 0,
coleenp@4037:              "About to go negative");
coleenp@4037:     Atomic::add_ptr(-1, &_free_chunks_count);
coleenp@4037:     jlong minus_v = (jlong) - (jlong) v;
coleenp@4037:     Atomic::add_ptr(minus_v, &_free_chunks_total);
coleenp@4037:   }
coleenp@4037: 
coleenp@4037:   // Debug support
coleenp@4037: 
coleenp@4037:   size_t sum_free_chunks();
coleenp@4037:   size_t sum_free_chunks_count();
coleenp@4037: 
coleenp@4037:   void locked_verify_free_chunks_total();
mgerdin@4264:   void slow_locked_verify_free_chunks_total() {
mgerdin@4264:     if (metaspace_slow_verify) {
mgerdin@4264:       locked_verify_free_chunks_total();
mgerdin@4264:     }
mgerdin@4264:   }
coleenp@4037:   void locked_verify_free_chunks_count();
mgerdin@4264:   void slow_locked_verify_free_chunks_count() {
mgerdin@4264:     if (metaspace_slow_verify) {
mgerdin@4264:       locked_verify_free_chunks_count();
mgerdin@4264:     }
mgerdin@4264:   }
coleenp@4037:   void verify_free_chunks_count();
coleenp@4037: 
coleenp@4037:  public:
coleenp@4037: 
stefank@5771:   ChunkManager(size_t specialized_size, size_t small_size, size_t medium_size)
stefank@5771:       : _free_chunks_total(0), _free_chunks_count(0) {
stefank@5771:     _free_chunks[SpecializedIndex].set_size(specialized_size);
stefank@5771:     _free_chunks[SmallIndex].set_size(small_size);
stefank@5771:     _free_chunks[MediumIndex].set_size(medium_size);
stefank@5771:   }
coleenp@4037: 
coleenp@4037:   // add or delete (return) a chunk to the global freelist.
coleenp@4037:   Metachunk* chunk_freelist_allocate(size_t word_size);
coleenp@4037: 
jmasa@4382:   // Map a size to a list index assuming that there are lists
jmasa@4382:   // for special, small, medium, and humongous chunks.
jmasa@4382:   static ChunkIndex list_index(size_t size);
jmasa@4382: 
jmasa@5007:   // Remove the chunk from its freelist.  It is
jmasa@5007:   // expected to be on one of the _free_chunks[] lists.
jmasa@5007:   void remove_chunk(Metachunk* chunk);
jmasa@5007: 
jmasa@4932:   // Add the simple linked list of chunks to the freelist of chunks
jmasa@4932:   // of type index.
jmasa@4932:   void return_chunks(ChunkIndex index, Metachunk* chunks);
jmasa@4932: 
coleenp@4037:   // Total of the space in the free chunks list
ehelin@5703:   size_t free_chunks_total_words();
ehelin@5703:   size_t free_chunks_total_bytes();
coleenp@4037: 
coleenp@4037:   // Number of chunks in the free chunks list
coleenp@4037:   size_t free_chunks_count();
coleenp@4037: 
coleenp@4037:   void inc_free_chunks_total(size_t v, size_t count = 1) {
coleenp@4037:     Atomic::add_ptr(count, &_free_chunks_count);
coleenp@4037:     Atomic::add_ptr(v, &_free_chunks_total);
coleenp@4037:   }
jmasa@4196:   ChunkTreeDictionary* humongous_dictionary() {
jmasa@4196:     return &_humongous_dictionary;
jmasa@4196:   }
coleenp@4037: 
coleenp@4037:   ChunkList* free_chunks(ChunkIndex index);
coleenp@4037: 
coleenp@4037:   // Returns the list for the given chunk word size.
coleenp@4037:   ChunkList* find_free_chunks_list(size_t word_size);
coleenp@4037: 
stefank@5945:   // Remove from a list by size.  Selects list based on size of chunk.
coleenp@4037:   Metachunk* free_chunks_get(size_t chunk_word_size);
coleenp@4037: 
ehelin@6420: #define index_bounds_check(index)                                         \
ehelin@6420:   assert(index == SpecializedIndex ||                                     \
ehelin@6420:          index == SmallIndex ||                                           \
ehelin@6420:          index == MediumIndex ||                                          \
ehelin@6420:          index == HumongousIndex, err_msg("Bad index: %d", (int) index))
ehelin@6420: 
ehelin@6420:   size_t num_free_chunks(ChunkIndex index) const {
ehelin@6420:     index_bounds_check(index);
ehelin@6420: 
ehelin@6420:     if (index == HumongousIndex) {
ehelin@6420:       return _humongous_dictionary.total_free_blocks();
ehelin@6420:     }
ehelin@6420: 
ehelin@6420:     ssize_t count = _free_chunks[index].count();
ehelin@6420:     return count == -1 ? 0 : (size_t) count;
ehelin@6420:   }
ehelin@6420: 
ehelin@6420:   size_t size_free_chunks_in_bytes(ChunkIndex index) const {
ehelin@6420:     index_bounds_check(index);
ehelin@6420: 
ehelin@6420:     size_t word_size = 0;
ehelin@6420:     if (index == HumongousIndex) {
ehelin@6420:       word_size = _humongous_dictionary.total_size();
ehelin@6420:     } else {
ehelin@6420:       const size_t size_per_chunk_in_words = _free_chunks[index].size();
ehelin@6420:       word_size = size_per_chunk_in_words * num_free_chunks(index);
ehelin@6420:     }
ehelin@6420: 
ehelin@6420:     return word_size * BytesPerWord;
ehelin@6420:   }
ehelin@6420: 
ehelin@6420:   MetaspaceChunkFreeListSummary chunk_free_list_summary() const {
ehelin@6420:     return MetaspaceChunkFreeListSummary(num_free_chunks(SpecializedIndex),
ehelin@6420:                                          num_free_chunks(SmallIndex),
ehelin@6420:                                          num_free_chunks(MediumIndex),
ehelin@6420:                                          num_free_chunks(HumongousIndex),
ehelin@6420:                                          size_free_chunks_in_bytes(SpecializedIndex),
ehelin@6420:                                          size_free_chunks_in_bytes(SmallIndex),
ehelin@6420:                                          size_free_chunks_in_bytes(MediumIndex),
ehelin@6420:                                          size_free_chunks_in_bytes(HumongousIndex));
ehelin@6420:   }
ehelin@6420: 
coleenp@4037:   // Debug support
coleenp@4037:   void verify();
mgerdin@4264:   void slow_verify() {
mgerdin@4264:     if (metaspace_slow_verify) {
mgerdin@4264:       verify();
mgerdin@4264:     }
mgerdin@4264:   }
coleenp@4037:   void locked_verify();
mgerdin@4264:   void slow_locked_verify() {
mgerdin@4264:     if (metaspace_slow_verify) {
mgerdin@4264:       locked_verify();
mgerdin@4264:     }
mgerdin@4264:   }
coleenp@4037:   void verify_free_chunks_total();
coleenp@4037: 
coleenp@4037:   void locked_print_free_chunks(outputStream* st);
coleenp@4037:   void locked_print_sum_free_chunks(outputStream* st);
jmasa@4196: 
stefank@5771:   void print_on(outputStream* st) const;
coleenp@4037: };
coleenp@4037: 
coleenp@4037: // Used to manage the free list of Metablocks (a block corresponds
coleenp@4037: // to the allocation of a quantum of metadata).
coleenp@4037: class BlockFreelist VALUE_OBJ_CLASS_SPEC {
jmasa@4196:   BlockTreeDictionary* _dictionary;
jmasa@4196: 
mgerdin@5699:   // Only allocate and split from freelist if the size of the allocation
mgerdin@5699:   // is at least 1/4th the size of the available block.
mgerdin@5699:   const static int WasteMultiplier = 4;
mgerdin@5699: 
coleenp@4037:   // Accessors
jmasa@4196:   BlockTreeDictionary* dictionary() const { return _dictionary; }
coleenp@4037: 
coleenp@4037:  public:
coleenp@4037:   BlockFreelist();
coleenp@4037:   ~BlockFreelist();
coleenp@4037: 
coleenp@4037:   // Get and return a block to the free list
jmasa@4196:   MetaWord* get_block(size_t word_size);
jmasa@4196:   void return_block(MetaWord* p, size_t word_size);
jmasa@4196: 
jmasa@4196:   size_t total_size() {
jmasa@4196:   if (dictionary() == NULL) {
coleenp@4037:     return 0;
jmasa@4196:   } else {
jmasa@4196:     return dictionary()->total_size();
coleenp@4037:   }
jmasa@4196: }
coleenp@4037: 
coleenp@4037:   void print_on(outputStream* st) const;
coleenp@4037: };
coleenp@4037: 
stefank@5941: // A VirtualSpaceList node.
coleenp@4037: class VirtualSpaceNode : public CHeapObj<mtClass> {
coleenp@4037:   friend class VirtualSpaceList;
coleenp@4037: 
coleenp@4037:   // Link to next VirtualSpaceNode
coleenp@4037:   VirtualSpaceNode* _next;
coleenp@4037: 
coleenp@4037:   // total in the VirtualSpace
coleenp@4037:   MemRegion _reserved;
coleenp@4037:   ReservedSpace _rs;
coleenp@4037:   VirtualSpace _virtual_space;
coleenp@4037:   MetaWord* _top;
jmasa@5007:   // count of chunks contained in this VirtualSpace
jmasa@5007:   uintx _container_count;
coleenp@4037: 
coleenp@4037:   // Convenience functions to access the _virtual_space
coleenp@4037:   char* low()  const { return virtual_space()->low(); }
coleenp@4037:   char* high() const { return virtual_space()->high(); }
coleenp@4037: 
jmasa@5007:   // The first Metachunk will be allocated at the bottom of the
jmasa@5007:   // VirtualSpace
jmasa@5007:   Metachunk* first_chunk() { return (Metachunk*) bottom(); }
jmasa@5007: 
mgerdin@6004:   // Committed but unused space in the virtual space
mgerdin@6004:   size_t free_words_in_vs() const;
coleenp@4037:  public:
coleenp@4037: 
coleenp@4037:   VirtualSpaceNode(size_t byte_size);
jmasa@5007:   VirtualSpaceNode(ReservedSpace rs) : _top(NULL), _next(NULL), _rs(rs), _container_count(0) {}
coleenp@4037:   ~VirtualSpaceNode();
coleenp@4037: 
hseigel@5528:   // Convenience functions for logical bottom and end
hseigel@5528:   MetaWord* bottom() const { return (MetaWord*) _virtual_space.low(); }
hseigel@5528:   MetaWord* end() const { return (MetaWord*) _virtual_space.high(); }
hseigel@5528: 
coleenp@6678:   bool contains(const void* ptr) { return ptr >= low() && ptr < high(); }
coleenp@6678: 
stefank@5704:   size_t reserved_words() const  { return _virtual_space.reserved_size() / BytesPerWord; }
stefank@5704:   size_t committed_words() const { return _virtual_space.actual_committed_size() / BytesPerWord; }
stefank@5704: 
stefank@5863:   bool is_pre_committed() const { return _virtual_space.special(); }
stefank@5863: 
coleenp@4037:   // address of next available space in _virtual_space;
coleenp@4037:   // Accessors
coleenp@4037:   VirtualSpaceNode* next() { return _next; }
coleenp@4037:   void set_next(VirtualSpaceNode* v) { _next = v; }
coleenp@4037: 
coleenp@4037:   void set_reserved(MemRegion const v) { _reserved = v; }
coleenp@4037:   void set_top(MetaWord* v) { _top = v; }
coleenp@4037: 
coleenp@4037:   // Accessors
coleenp@4037:   MemRegion* reserved() { return &_reserved; }
coleenp@4037:   VirtualSpace* virtual_space() const { return (VirtualSpace*) &_virtual_space; }
coleenp@4037: 
jmasa@5015:   // Returns true if "word_size" is available in the VirtualSpace
stefank@6170:   bool is_available(size_t word_size) { return word_size <= pointer_delta(end(), _top, sizeof(MetaWord)); }
coleenp@4037: 
coleenp@4037:   MetaWord* top() const { return _top; }
coleenp@4037:   void inc_top(size_t word_size) { _top += word_size; }
coleenp@4037: 
jmasa@5007:   uintx container_count() { return _container_count; }
stefank@5771:   void inc_container_count();
jmasa@5007:   void dec_container_count();
jmasa@5007: #ifdef ASSERT
stefank@5771:   uint container_count_slow();
jmasa@5007:   void verify_container_count();
jmasa@5007: #endif
jmasa@5007: 
coleenp@4037:   // used and capacity in this single entry in the list
coleenp@4037:   size_t used_words_in_vs() const;
coleenp@4037:   size_t capacity_words_in_vs() const;
coleenp@4037: 
coleenp@4037:   bool initialize();
coleenp@4037: 
coleenp@4037:   // get space from the virtual space
coleenp@4037:   Metachunk* take_from_committed(size_t chunk_word_size);
coleenp@4037: 
coleenp@4037:   // Allocate a chunk from the virtual space and return it.
coleenp@4037:   Metachunk* get_chunk_vs(size_t chunk_word_size);
coleenp@4037: 
coleenp@4037:   // Expands/shrinks the committed space in a virtual space.  Delegates
coleenp@4037:   // to Virtualspace
stefank@5863:   bool expand_by(size_t min_words, size_t preferred_words);
coleenp@4037: 
jmasa@5007:   // In preparation for deleting this node, remove all the chunks
jmasa@5007:   // in the node from any freelist.
jmasa@5007:   void purge(ChunkManager* chunk_manager);
jmasa@5007: 
mgerdin@6004:   // If an allocation doesn't fit in the current node a new node is created.
mgerdin@6004:   // Allocate chunks out of the remaining committed space in this node
mgerdin@6004:   // to avoid wasting that memory.
mgerdin@6004:   // This always adds up because all the chunk sizes are multiples of
mgerdin@6004:   // the smallest chunk size.
mgerdin@6004:   void retire(ChunkManager* chunk_manager);
mgerdin@6004: 
coleenp@4304: #ifdef ASSERT
coleenp@4037:   // Debug support
coleenp@4037:   void mangle();
coleenp@4304: #endif
coleenp@4037: 
coleenp@4037:   void print_on(outputStream* st) const;
coleenp@4037: };
coleenp@4037: 
stefank@5863: #define assert_is_ptr_aligned(ptr, alignment) \
stefank@5863:   assert(is_ptr_aligned(ptr, alignment),      \
stefank@5863:     err_msg(PTR_FORMAT " is not aligned to "  \
stefank@5863:       SIZE_FORMAT, ptr, alignment))
stefank@5863: 
stefank@5863: #define assert_is_size_aligned(size, alignment) \
stefank@5863:   assert(is_size_aligned(size, alignment),      \
stefank@5863:     err_msg(SIZE_FORMAT " is not aligned to "   \
stefank@5863:        SIZE_FORMAT, size, alignment))
stefank@5863: 
stefank@5863: 
stefank@5863: // Decide if large pages should be committed when the memory is reserved.
stefank@5863: static bool should_commit_large_pages_when_reserving(size_t bytes) {
stefank@5863:   if (UseLargePages && UseLargePagesInMetaspace && !os::can_commit_large_page_memory()) {
stefank@5863:     size_t words = bytes / BytesPerWord;
stefank@5863:     bool is_class = false; // We never reserve large pages for the class space.
stefank@5863:     if (MetaspaceGC::can_expand(words, is_class) &&
stefank@5863:         MetaspaceGC::allowed_expansion() >= words) {
stefank@5863:       return true;
stefank@5863:     }
stefank@5863:   }
stefank@5863: 
stefank@5863:   return false;
stefank@5863: }
stefank@5863: 
coleenp@4037:   // byte_size is the size of the associated virtualspace.
stefank@5863: VirtualSpaceNode::VirtualSpaceNode(size_t bytes) : _top(NULL), _next(NULL), _rs(), _container_count(0) {
stefank@5863:   assert_is_size_aligned(bytes, Metaspace::reserve_alignment());
zgu@4752: 
iklam@7089: #if INCLUDE_CDS
coleenp@4804:   // This allocates memory with mmap.  For DumpSharedspaces, try to reserve
coleenp@4804:   // configurable address, generally at the top of the Java heap so other
coleenp@4804:   // memory addresses don't conflict.
coleenp@4037:   if (DumpSharedSpaces) {
stefank@5863:     bool large_pages = false; // No large pages when dumping the CDS archive.
stefank@5863:     char* shared_base = (char*)align_ptr_up((char*)SharedBaseAddress, Metaspace::reserve_alignment());
stefank@5863: 
stefank@5863:     _rs = ReservedSpace(bytes, Metaspace::reserve_alignment(), large_pages, shared_base, 0);
coleenp@4037:     if (_rs.is_reserved()) {
coleenp@4804:       assert(shared_base == 0 || _rs.base() == shared_base, "should match");
coleenp@4037:     } else {
coleenp@4804:       // Get a mmap region anywhere if the SharedBaseAddress fails.
stefank@5863:       _rs = ReservedSpace(bytes, Metaspace::reserve_alignment(), large_pages);
coleenp@4037:     }
coleenp@4037:     MetaspaceShared::set_shared_rs(&_rs);
iklam@7089:   } else
iklam@7089: #endif
iklam@7089:   {
stefank@5863:     bool large_pages = should_commit_large_pages_when_reserving(bytes);
stefank@5863: 
stefank@5863:     _rs = ReservedSpace(bytes, Metaspace::reserve_alignment(), large_pages);
coleenp@4037:   }
coleenp@4037: 
stefank@5863:   if (_rs.is_reserved()) {
stefank@5863:     assert(_rs.base() != NULL, "Catch if we get a NULL address");
stefank@5863:     assert(_rs.size() != 0, "Catch if we get a 0 size");
stefank@5863:     assert_is_ptr_aligned(_rs.base(), Metaspace::reserve_alignment());
stefank@5863:     assert_is_size_aligned(_rs.size(), Metaspace::reserve_alignment());
stefank@5863: 
stefank@5863:     MemTracker::record_virtual_memory_type((address)_rs.base(), mtClass);
stefank@5863:   }
coleenp@4037: }
coleenp@4037: 
jmasa@5007: void VirtualSpaceNode::purge(ChunkManager* chunk_manager) {
jmasa@5007:   Metachunk* chunk = first_chunk();
jmasa@5007:   Metachunk* invalid_chunk = (Metachunk*) top();
jmasa@5007:   while (chunk < invalid_chunk ) {
stefank@5941:     assert(chunk->is_tagged_free(), "Should be tagged free");
stefank@5941:     MetaWord* next = ((MetaWord*)chunk) + chunk->word_size();
stefank@5941:     chunk_manager->remove_chunk(chunk);
stefank@5941:     assert(chunk->next() == NULL &&
stefank@5941:            chunk->prev() == NULL,
stefank@5941:            "Was not removed from its list");
stefank@5941:     chunk = (Metachunk*) next;
jmasa@5007:   }
jmasa@5007: }
jmasa@5007: 
jmasa@5007: #ifdef ASSERT
jmasa@5007: uint VirtualSpaceNode::container_count_slow() {
jmasa@5007:   uint count = 0;
jmasa@5007:   Metachunk* chunk = first_chunk();
jmasa@5007:   Metachunk* invalid_chunk = (Metachunk*) top();
jmasa@5007:   while (chunk < invalid_chunk ) {
jmasa@5007:     MetaWord* next = ((MetaWord*)chunk) + chunk->word_size();
jmasa@5007:     // Don't count the chunks on the free lists.  Those are
jmasa@5007:     // still part of the VirtualSpaceNode but not currently
jmasa@5007:     // counted.
stefank@5941:     if (!chunk->is_tagged_free()) {
jmasa@5007:       count++;
jmasa@5007:     }
jmasa@5007:     chunk = (Metachunk*) next;
jmasa@5007:   }
jmasa@5007:   return count;
jmasa@5007: }
jmasa@5007: #endif
jmasa@5007: 
coleenp@4037: // List of VirtualSpaces for metadata allocation.
coleenp@4037: class VirtualSpaceList : public CHeapObj<mtClass> {
coleenp@4037:   friend class VirtualSpaceNode;
coleenp@4037: 
coleenp@4037:   enum VirtualSpaceSizes {
coleenp@4037:     VirtualSpaceSize = 256 * K
coleenp@4037:   };
coleenp@4037: 
coleenp@4037:   // Head of the list
coleenp@4037:   VirtualSpaceNode* _virtual_space_list;
coleenp@4037:   // virtual space currently being used for allocations
coleenp@4037:   VirtualSpaceNode* _current_virtual_space;
coleenp@4037: 
stefank@5863:   // Is this VirtualSpaceList used for the compressed class space
coleenp@4037:   bool _is_class;
coleenp@4037: 
stefank@5704:   // Sum of reserved and committed memory in the virtual spaces
stefank@5704:   size_t _reserved_words;
stefank@5704:   size_t _committed_words;
stefank@5704: 
stefank@5704:   // Number of virtual spaces
coleenp@4037:   size_t _virtual_space_count;
coleenp@4037: 
coleenp@4037:   ~VirtualSpaceList();
coleenp@4037: 
coleenp@4037:   VirtualSpaceNode* virtual_space_list() const { return _virtual_space_list; }
coleenp@4037: 
coleenp@4037:   void set_virtual_space_list(VirtualSpaceNode* v) {
coleenp@4037:     _virtual_space_list = v;
coleenp@4037:   }
coleenp@4037:   void set_current_virtual_space(VirtualSpaceNode* v) {
coleenp@4037:     _current_virtual_space = v;
coleenp@4037:   }
coleenp@4037: 
stefank@5704:   void link_vs(VirtualSpaceNode* new_entry);
coleenp@4037: 
coleenp@4037:   // Get another virtual space and add it to the list.  This
coleenp@4037:   // is typically prompted by a failed attempt to allocate a chunk
coleenp@4037:   // and is typically followed by the allocation of a chunk.
stefank@5863:   bool create_new_virtual_space(size_t vs_word_size);
coleenp@4037: 
mgerdin@6004:   // Chunk up the unused committed space in the current
mgerdin@6004:   // virtual space and add the chunks to the free list.
mgerdin@6004:   void retire_current_virtual_space();
mgerdin@6004: 
coleenp@4037:  public:
coleenp@4037:   VirtualSpaceList(size_t word_size);
coleenp@4037:   VirtualSpaceList(ReservedSpace rs);
coleenp@4037: 
jmasa@5015:   size_t free_bytes();
jmasa@5015: 
jmasa@4382:   Metachunk* get_new_chunk(size_t word_size,
jmasa@4382:                            size_t grow_chunks_by_words,
jmasa@4382:                            size_t medium_chunk_bunch);
jmasa@4382: 
stefank@5863:   bool expand_node_by(VirtualSpaceNode* node,
stefank@5863:                       size_t min_words,
stefank@5863:                       size_t preferred_words);
stefank@5863: 
stefank@5863:   bool expand_by(size_t min_words,
stefank@5863:                  size_t preferred_words);
coleenp@4037: 
coleenp@4037:   VirtualSpaceNode* current_virtual_space() {
coleenp@4037:     return _current_virtual_space;
coleenp@4037:   }
coleenp@4037: 
coleenp@4037:   bool is_class() const { return _is_class; }
coleenp@4037: 
stefank@5863:   bool initialization_succeeded() { return _virtual_space_list != NULL; }
coleenp@4037: 
stefank@5704:   size_t reserved_words()  { return _reserved_words; }
stefank@5704:   size_t reserved_bytes()  { return reserved_words() * BytesPerWord; }
stefank@5704:   size_t committed_words() { return _committed_words; }
stefank@5704:   size_t committed_bytes() { return committed_words() * BytesPerWord; }
stefank@5704: 
stefank@5704:   void inc_reserved_words(size_t v);
stefank@5704:   void dec_reserved_words(size_t v);
stefank@5704:   void inc_committed_words(size_t v);
stefank@5704:   void dec_committed_words(size_t v);
jmasa@5007:   void inc_virtual_space_count();
jmasa@5007:   void dec_virtual_space_count();
jmasa@5007: 
coleenp@6678:   bool contains(const void* ptr);
coleenp@6678: 
jmasa@5007:   // Unlink empty VirtualSpaceNodes and free it.
stefank@5771:   void purge(ChunkManager* chunk_manager);
coleenp@4037: 
coleenp@4037:   void print_on(outputStream* st) const;
coleenp@4037: 
coleenp@4037:   class VirtualSpaceListIterator : public StackObj {
coleenp@4037:     VirtualSpaceNode* _virtual_spaces;
coleenp@4037:    public:
coleenp@4037:     VirtualSpaceListIterator(VirtualSpaceNode* virtual_spaces) :
coleenp@4037:       _virtual_spaces(virtual_spaces) {}
coleenp@4037: 
coleenp@4037:     bool repeat() {
coleenp@4037:       return _virtual_spaces != NULL;
coleenp@4037:     }
coleenp@4037: 
coleenp@4037:     VirtualSpaceNode* get_next() {
coleenp@4037:       VirtualSpaceNode* result = _virtual_spaces;
coleenp@4037:       if (_virtual_spaces != NULL) {
coleenp@4037:         _virtual_spaces = _virtual_spaces->next();
coleenp@4037:       }
coleenp@4037:       return result;
coleenp@4037:     }
coleenp@4037:   };
coleenp@4037: };
coleenp@4037: 
coleenp@4037: class Metadebug : AllStatic {
coleenp@4037:   // Debugging support for Metaspaces
coleenp@4037:   static int _allocation_fail_alot_count;
coleenp@4037: 
coleenp@4037:  public:
coleenp@4037: 
coleenp@4037:   static void init_allocation_fail_alot_count();
coleenp@4037: #ifdef ASSERT
coleenp@4037:   static bool test_metadata_failure();
coleenp@4037: #endif
coleenp@4037: };
coleenp@4037: 
coleenp@4037: int Metadebug::_allocation_fail_alot_count = 0;
coleenp@4037: 
coleenp@4037: //  SpaceManager - used by Metaspace to handle allocations
coleenp@4037: class SpaceManager : public CHeapObj<mtClass> {
coleenp@4037:   friend class Metaspace;
coleenp@4037:   friend class Metadebug;
coleenp@4037: 
coleenp@4037:  private:
jmasa@4382: 
coleenp@6305:   // protects allocations
coleenp@4037:   Mutex* const _lock;
coleenp@4037: 
jmasa@5162:   // Type of metadata allocated.
jmasa@5162:   Metaspace::MetadataType _mdtype;
jmasa@5162: 
coleenp@4037:   // List of chunks in use by this SpaceManager.  Allocations
coleenp@4037:   // are done from the current chunk.  The list is used for deallocating
coleenp@4037:   // chunks when the SpaceManager is freed.
jmasa@4196:   Metachunk* _chunks_in_use[NumberOfInUseLists];
coleenp@4037:   Metachunk* _current_chunk;
coleenp@4037: 
jwilhelm@7867:   // Number of small chunks to allocate to a manager
jwilhelm@7867:   // If class space manager, small chunks are unlimited
coleenp@4037:   static uint const _small_chunk_limit;
coleenp@4037: 
coleenp@4037:   // Sum of all space in allocated chunks
jmasa@5015:   size_t _allocated_blocks_words;
jmasa@5015: 
jmasa@5015:   // Sum of all allocated chunks
jmasa@5015:   size_t _allocated_chunks_words;
jmasa@5015:   size_t _allocated_chunks_count;
coleenp@4037: 
coleenp@4037:   // Free lists of blocks are per SpaceManager since they
coleenp@4037:   // are assumed to be in chunks in use by the SpaceManager
coleenp@4037:   // and all chunks in use by a SpaceManager are freed when
coleenp@4037:   // the class loader using the SpaceManager is collected.
coleenp@4037:   BlockFreelist _block_freelists;
coleenp@4037: 
coleenp@4037:   // protects virtualspace and chunk expansions
coleenp@4037:   static const char*  _expand_lock_name;
coleenp@4037:   static const int    _expand_lock_rank;
coleenp@4037:   static Mutex* const _expand_lock;
coleenp@4037: 
jmasa@4382:  private:
coleenp@4037:   // Accessors
coleenp@4037:   Metachunk* chunks_in_use(ChunkIndex index) const { return _chunks_in_use[index]; }
coleenp@6305:   void set_chunks_in_use(ChunkIndex index, Metachunk* v) {
coleenp@6305:     _chunks_in_use[index] = v;
coleenp@6305:   }
coleenp@4037: 
coleenp@4037:   BlockFreelist* block_freelists() const {
coleenp@4037:     return (BlockFreelist*) &_block_freelists;
coleenp@4037:   }
coleenp@4037: 
jmasa@5162:   Metaspace::MetadataType mdtype() { return _mdtype; }
stefank@5771: 
stefank@5771:   VirtualSpaceList* vs_list()   const { return Metaspace::get_space_list(_mdtype); }
stefank@5771:   ChunkManager* chunk_manager() const { return Metaspace::get_chunk_manager(_mdtype); }
coleenp@4037: 
coleenp@4037:   Metachunk* current_chunk() const { return _current_chunk; }
coleenp@4037:   void set_current_chunk(Metachunk* v) {
coleenp@4037:     _current_chunk = v;
coleenp@4037:   }
coleenp@4037: 
coleenp@4037:   Metachunk* find_current_chunk(size_t word_size);
coleenp@4037: 
coleenp@4037:   // Add chunk to the list of chunks in use
coleenp@4037:   void add_chunk(Metachunk* v, bool make_current);
mgerdin@5699:   void retire_current_chunk();
coleenp@4037: 
coleenp@4037:   Mutex* lock() const { return _lock; }
coleenp@4037: 
jmasa@4382:   const char* chunk_size_name(ChunkIndex index) const;
jmasa@4382: 
jmasa@4382:  protected:
jmasa@4382:   void initialize();
jmasa@4382: 
coleenp@4037:  public:
jmasa@5162:   SpaceManager(Metaspace::MetadataType mdtype,
stefank@5771:                Mutex* lock);
coleenp@4037:   ~SpaceManager();
coleenp@4037: 
jmasa@4382:   enum ChunkMultiples {
jmasa@4382:     MediumChunkMultiple = 4
coleenp@4037:   };
coleenp@4037: 
stefank@5771:   bool is_class() { return _mdtype == Metaspace::ClassType; }
stefank@5771: 
coleenp@4037:   // Accessors
mgerdin@6004:   size_t specialized_chunk_size() { return (size_t) is_class() ? ClassSpecializedChunk : SpecializedChunk; }
mgerdin@6004:   size_t small_chunk_size()       { return (size_t) is_class() ? ClassSmallChunk : SmallChunk; }
mgerdin@6004:   size_t medium_chunk_size()      { return (size_t) is_class() ? ClassMediumChunk : MediumChunk; }
mgerdin@6004:   size_t medium_chunk_bunch()     { return medium_chunk_size() * MediumChunkMultiple; }
mgerdin@6004: 
mgerdin@6004:   size_t smallest_chunk_size()  { return specialized_chunk_size(); }
jmasa@4382: 
jmasa@5015:   size_t allocated_blocks_words() const { return _allocated_blocks_words; }
jmasa@5015:   size_t allocated_blocks_bytes() const { return _allocated_blocks_words * BytesPerWord; }
jmasa@5015:   size_t allocated_chunks_words() const { return _allocated_chunks_words; }
jmasa@5015:   size_t allocated_chunks_count() const { return _allocated_chunks_count; }
jmasa@5015: 
jmasa@4382:   bool is_humongous(size_t word_size) { return word_size > medium_chunk_size(); }
coleenp@4037: 
coleenp@4037:   static Mutex* expand_lock() { return _expand_lock; }
coleenp@4037: 
jmasa@5015:   // Increment the per Metaspace and global running sums for Metachunks
jmasa@5015:   // by the given size.  This is used when a Metachunk to added to
jmasa@5015:   // the in-use list.
jmasa@5015:   void inc_size_metrics(size_t words);
jmasa@5015:   // Increment the per Metaspace and global running sums Metablocks by the given
jmasa@5015:   // size.  This is used when a Metablock is allocated.
jmasa@5015:   void inc_used_metrics(size_t words);
jmasa@5015:   // Delete the portion of the running sums for this SpaceManager. That is,
jmasa@5015:   // the globals running sums for the Metachunks and Metablocks are
jmasa@5015:   // decremented for all the Metachunks in-use by this SpaceManager.
jmasa@5015:   void dec_total_from_size_metrics();
jmasa@5015: 
jmasa@4382:   // Set the sizes for the initial chunks.
jmasa@4382:   void get_initial_chunk_sizes(Metaspace::MetaspaceType type,
jmasa@4382:                                size_t* chunk_word_size,
jmasa@4382:                                size_t* class_chunk_word_size);
jmasa@4382: 
coleenp@4037:   size_t sum_capacity_in_chunks_in_use() const;
coleenp@4037:   size_t sum_used_in_chunks_in_use() const;
coleenp@4037:   size_t sum_free_in_chunks_in_use() const;
coleenp@4037:   size_t sum_waste_in_chunks_in_use() const;
coleenp@4037:   size_t sum_waste_in_chunks_in_use(ChunkIndex index ) const;
coleenp@4037: 
coleenp@4037:   size_t sum_count_in_chunks_in_use();
coleenp@4037:   size_t sum_count_in_chunks_in_use(ChunkIndex i);
coleenp@4037: 
jmasa@4382:   Metachunk* get_new_chunk(size_t word_size, size_t grow_chunks_by_words);
jmasa@4382: 
coleenp@4037:   // Block allocation and deallocation.
coleenp@4037:   // Allocates a block from the current chunk
coleenp@4037:   MetaWord* allocate(size_t word_size);
coleenp@4037: 
coleenp@4037:   // Helper for allocations
jmasa@4196:   MetaWord* allocate_work(size_t word_size);
coleenp@4037: 
coleenp@4037:   // Returns a block to the per manager freelist
jmasa@4196:   void deallocate(MetaWord* p, size_t word_size);
coleenp@4037: 
coleenp@4037:   // Based on the allocation size and a minimum chunk size,
coleenp@4037:   // returned chunk size (for expanding space for chunk allocation).
coleenp@4037:   size_t calc_chunk_size(size_t allocation_word_size);
coleenp@4037: 
coleenp@4037:   // Called when an allocation from the current chunk fails.
coleenp@4037:   // Gets a new chunk (may require getting a new virtual space),
coleenp@4037:   // and allocates from that chunk.
jmasa@4196:   MetaWord* grow_and_allocate(size_t word_size);
coleenp@4037: 
stefank@5864:   // Notify memory usage to MemoryService.
stefank@5864:   void track_metaspace_memory_usage();
stefank@5864: 
coleenp@4037:   // debugging support.
coleenp@4037: 
coleenp@4037:   void dump(outputStream* const out) const;
coleenp@4037:   void print_on(outputStream* st) const;
coleenp@4037:   void locked_print_chunks_in_use_on(outputStream* st) const;
coleenp@4037: 
coleenp@4037:   void verify();
jmasa@4327:   void verify_chunk_size(Metachunk* chunk);
coleenp@4304:   NOT_PRODUCT(void mangle_freed_chunks();)
coleenp@4037: #ifdef ASSERT
jmasa@5015:   void verify_allocated_blocks_words();
coleenp@4037: #endif
iklam@5208: 
iklam@5208:   size_t get_raw_word_size(size_t word_size) {
iklam@5208:     size_t byte_size = word_size * BytesPerWord;
iklam@5208: 
stefank@5941:     size_t raw_bytes_size = MAX2(byte_size, sizeof(Metablock));
stefank@5941:     raw_bytes_size = align_size_up(raw_bytes_size, Metachunk::object_alignment());
stefank@5941: 
iklam@5208:     size_t raw_word_size = raw_bytes_size / BytesPerWord;
iklam@5208:     assert(raw_word_size * BytesPerWord == raw_bytes_size, "Size problem");
iklam@5208: 
iklam@5208:     return raw_word_size;
iklam@5208:   }
coleenp@4037: };
coleenp@4037: 
coleenp@4037: uint const SpaceManager::_small_chunk_limit = 4;
coleenp@4037: 
coleenp@4037: const char* SpaceManager::_expand_lock_name =
coleenp@4037:   "SpaceManager chunk allocation lock";
coleenp@4037: const int SpaceManager::_expand_lock_rank = Monitor::leaf - 1;
coleenp@4037: Mutex* const SpaceManager::_expand_lock =
coleenp@4037:   new Mutex(SpaceManager::_expand_lock_rank,
coleenp@4037:             SpaceManager::_expand_lock_name,
coleenp@4037:             Mutex::_allow_vm_block_flag);
coleenp@4037: 
jmasa@5007: void VirtualSpaceNode::inc_container_count() {
jmasa@5007:   assert_lock_strong(SpaceManager::expand_lock());
jmasa@5007:   _container_count++;
jmasa@5007:   assert(_container_count == container_count_slow(),
jmasa@5007:          err_msg("Inconsistency in countainer_count _container_count " SIZE_FORMAT
stefank@5771:                  " container_count_slow() " SIZE_FORMAT,
jmasa@5007:                  _container_count, container_count_slow()));
jmasa@5007: }
jmasa@5007: 
jmasa@5007: void VirtualSpaceNode::dec_container_count() {
jmasa@5007:   assert_lock_strong(SpaceManager::expand_lock());
jmasa@5007:   _container_count--;
jmasa@5007: }
jmasa@5007: 
jmasa@5007: #ifdef ASSERT
jmasa@5007: void VirtualSpaceNode::verify_container_count() {
jmasa@5007:   assert(_container_count == container_count_slow(),
jmasa@5007:     err_msg("Inconsistency in countainer_count _container_count " SIZE_FORMAT
stefank@5771:             " container_count_slow() " SIZE_FORMAT, _container_count, container_count_slow()));
jmasa@5007: }
jmasa@5007: #endif
jmasa@5007: 
coleenp@4037: // BlockFreelist methods
coleenp@4037: 
coleenp@4037: BlockFreelist::BlockFreelist() : _dictionary(NULL) {}
coleenp@4037: 
coleenp@4037: BlockFreelist::~BlockFreelist() {
coleenp@4037:   if (_dictionary != NULL) {
coleenp@4037:     if (Verbose && TraceMetadataChunkAllocation) {
coleenp@4037:       _dictionary->print_free_lists(gclog_or_tty);
coleenp@4037:     }
coleenp@4037:     delete _dictionary;
coleenp@4037:   }
coleenp@4037: }
coleenp@4037: 
jmasa@4196: void BlockFreelist::return_block(MetaWord* p, size_t word_size) {
stefank@5941:   Metablock* free_chunk = ::new (p) Metablock(word_size);
coleenp@4037:   if (dictionary() == NULL) {
jmasa@4196:    _dictionary = new BlockTreeDictionary();
coleenp@4037:   }
jmasa@4196:   dictionary()->return_chunk(free_chunk);
coleenp@4037: }
coleenp@4037: 
jmasa@4196: MetaWord* BlockFreelist::get_block(size_t word_size) {
coleenp@4037:   if (dictionary() == NULL) {
coleenp@4037:     return NULL;
coleenp@4037:   }
coleenp@4037: 
goetz@6337:   if (word_size < TreeChunk<Metablock, FreeList<Metablock> >::min_size()) {
jmasa@4196:     // Dark matter.  Too small for dictionary.
coleenp@4037:     return NULL;
coleenp@4037:   }
jmasa@4196: 
jmasa@4196:   Metablock* free_block =
mgerdin@5699:     dictionary()->get_chunk(word_size, FreeBlockDictionary<Metablock>::atLeast);
jmasa@4196:   if (free_block == NULL) {
jmasa@4196:     return NULL;
jmasa@4196:   }
jmasa@4196: 
mgerdin@5699:   const size_t block_size = free_block->size();
mgerdin@5699:   if (block_size > WasteMultiplier * word_size) {
mgerdin@5699:     return_block((MetaWord*)free_block, block_size);
mgerdin@5699:     return NULL;
mgerdin@5699:   }
mgerdin@5699: 
mgerdin@5699:   MetaWord* new_block = (MetaWord*)free_block;
mgerdin@5699:   assert(block_size >= word_size, "Incorrect size of block from freelist");
mgerdin@5699:   const size_t unused = block_size - word_size;
goetz@6337:   if (unused >= TreeChunk<Metablock, FreeList<Metablock> >::min_size()) {
mgerdin@5699:     return_block(new_block + word_size, unused);
mgerdin@5699:   }
mgerdin@5699: 
mgerdin@5699:   return new_block;
coleenp@4037: }
coleenp@4037: 
coleenp@4037: void BlockFreelist::print_on(outputStream* st) const {
coleenp@4037:   if (dictionary() == NULL) {
coleenp@4037:     return;
coleenp@4037:   }
coleenp@4037:   dictionary()->print_free_lists(st);
coleenp@4037: }
coleenp@4037: 
coleenp@4037: // VirtualSpaceNode methods
coleenp@4037: 
coleenp@4037: VirtualSpaceNode::~VirtualSpaceNode() {
coleenp@4037:   _rs.release();
jmasa@5007: #ifdef ASSERT
jmasa@5007:   size_t word_size = sizeof(*this) / BytesPerWord;
jmasa@5007:   Copy::fill_to_words((HeapWord*) this, word_size, 0xf1f1f1f1);
jmasa@5007: #endif
coleenp@4037: }
coleenp@4037: 
coleenp@4037: size_t VirtualSpaceNode::used_words_in_vs() const {
coleenp@4037:   return pointer_delta(top(), bottom(), sizeof(MetaWord));
coleenp@4037: }
coleenp@4037: 
coleenp@4037: // Space committed in the VirtualSpace
coleenp@4037: size_t VirtualSpaceNode::capacity_words_in_vs() const {
coleenp@4037:   return pointer_delta(end(), bottom(), sizeof(MetaWord));
coleenp@4037: }
coleenp@4037: 
jmasa@5015: size_t VirtualSpaceNode::free_words_in_vs() const {
jmasa@5015:   return pointer_delta(end(), top(), sizeof(MetaWord));
jmasa@5015: }
coleenp@4037: 
coleenp@4037: // Allocates the chunk from the virtual space only.
coleenp@4037: // This interface is also used internally for debugging.  Not all
coleenp@4037: // chunks removed here are necessarily used for allocation.
coleenp@4037: Metachunk* VirtualSpaceNode::take_from_committed(size_t chunk_word_size) {
coleenp@4037:   // Bottom of the new chunk
coleenp@4037:   MetaWord* chunk_limit = top();
coleenp@4037:   assert(chunk_limit != NULL, "Not safe to call this method");
coleenp@4037: 
stefank@5863:   // The virtual spaces are always expanded by the
stefank@5863:   // commit granularity to enforce the following condition.
stefank@5863:   // Without this the is_available check will not work correctly.
stefank@5863:   assert(_virtual_space.committed_size() == _virtual_space.actual_committed_size(),
stefank@5863:       "The committed memory doesn't match the expanded memory.");
stefank@5863: 
coleenp@4037:   if (!is_available(chunk_word_size)) {
coleenp@4037:     if (TraceMetadataChunkAllocation) {
stefank@5708:       gclog_or_tty->print("VirtualSpaceNode::take_from_committed() not available %d words ", chunk_word_size);
coleenp@4037:       // Dump some information about the virtual space that is nearly full
stefank@5708:       print_on(gclog_or_tty);
coleenp@4037:     }
coleenp@4037:     return NULL;
coleenp@4037:   }
coleenp@4037: 
coleenp@4037:   // Take the space  (bump top on the current virtual space).
coleenp@4037:   inc_top(chunk_word_size);
coleenp@4037: 
jmasa@5007:   // Initialize the chunk
jmasa@5007:   Metachunk* result = ::new (chunk_limit) Metachunk(chunk_word_size, this);
coleenp@4037:   return result;
coleenp@4037: }
coleenp@4037: 
coleenp@4037: 
coleenp@4037: // Expand the virtual space (commit more of the reserved space)
stefank@5863: bool VirtualSpaceNode::expand_by(size_t min_words, size_t preferred_words) {
stefank@5863:   size_t min_bytes = min_words * BytesPerWord;
stefank@5863:   size_t preferred_bytes = preferred_words * BytesPerWord;
stefank@5863: 
stefank@5863:   size_t uncommitted = virtual_space()->reserved_size() - virtual_space()->actual_committed_size();
stefank@5863: 
stefank@5863:   if (uncommitted < min_bytes) {
stefank@5863:     return false;
coleenp@4037:   }
stefank@5863: 
stefank@5863:   size_t commit = MIN2(preferred_bytes, uncommitted);
stefank@5863:   bool result = virtual_space()->expand_by(commit, false);
stefank@5863: 
stefank@5863:   assert(result, "Failed to commit memory");
stefank@5863: 
coleenp@4037:   return result;
coleenp@4037: }
coleenp@4037: 
coleenp@4037: Metachunk* VirtualSpaceNode::get_chunk_vs(size_t chunk_word_size) {
coleenp@4037:   assert_lock_strong(SpaceManager::expand_lock());
jmasa@5007:   Metachunk* result = take_from_committed(chunk_word_size);
jmasa@5007:   if (result != NULL) {
jmasa@5007:     inc_container_count();
jmasa@5007:   }
jmasa@5007:   return result;
coleenp@4037: }
coleenp@4037: 
coleenp@4037: bool VirtualSpaceNode::initialize() {
coleenp@4037: 
coleenp@4037:   if (!_rs.is_reserved()) {
coleenp@4037:     return false;
coleenp@4037:   }
coleenp@4037: 
stefank@5863:   // These are necessary restriction to make sure that the virtual space always
stefank@5863:   // grows in steps of Metaspace::commit_alignment(). If both base and size are
stefank@5863:   // aligned only the middle alignment of the VirtualSpace is used.
stefank@5863:   assert_is_ptr_aligned(_rs.base(), Metaspace::commit_alignment());
stefank@5863:   assert_is_size_aligned(_rs.size(), Metaspace::commit_alignment());
stefank@5863: 
stefank@5863:   // ReservedSpaces marked as special will have the entire memory
stefank@5863:   // pre-committed. Setting a committed size will make sure that
stefank@5863:   // committed_size and actual_committed_size agrees.
stefank@5863:   size_t pre_committed_size = _rs.special() ? _rs.size() : 0;
stefank@5863: 
stefank@5863:   bool result = virtual_space()->initialize_with_granularity(_rs, pre_committed_size,
stefank@5863:                                             Metaspace::commit_alignment());
coleenp@4037:   if (result) {
stefank@5863:     assert(virtual_space()->committed_size() == virtual_space()->actual_committed_size(),
stefank@5863:         "Checking that the pre-committed memory was registered by the VirtualSpace");
stefank@5863: 
coleenp@4037:     set_top((MetaWord*)virtual_space()->low());
coleenp@4037:     set_reserved(MemRegion((HeapWord*)_rs.base(),
coleenp@4037:                  (HeapWord*)(_rs.base() + _rs.size())));
coleenp@4038: 
coleenp@4038:     assert(reserved()->start() == (HeapWord*) _rs.base(),
coleenp@4038:       err_msg("Reserved start was not set properly " PTR_FORMAT
coleenp@4038:         " != " PTR_FORMAT, reserved()->start(), _rs.base()));
coleenp@4038:     assert(reserved()->word_size() == _rs.size() / BytesPerWord,
coleenp@4038:       err_msg("Reserved size was not set properly " SIZE_FORMAT
coleenp@4038:         " != " SIZE_FORMAT, reserved()->word_size(),
coleenp@4038:         _rs.size() / BytesPerWord));
coleenp@4037:   }
coleenp@4037: 
coleenp@4037:   return result;
coleenp@4037: }
coleenp@4037: 
coleenp@4037: void VirtualSpaceNode::print_on(outputStream* st) const {
coleenp@4037:   size_t used = used_words_in_vs();
coleenp@4037:   size_t capacity = capacity_words_in_vs();
coleenp@4037:   VirtualSpace* vs = virtual_space();
coleenp@4037:   st->print_cr("   space @ " PTR_FORMAT " " SIZE_FORMAT "K, %3d%% used "
coleenp@4037:            "[" PTR_FORMAT ", " PTR_FORMAT ", "
coleenp@4037:            PTR_FORMAT ", " PTR_FORMAT ")",
jmasa@4382:            vs, capacity / K,
jmasa@4382:            capacity == 0 ? 0 : used * 100 / capacity,
coleenp@4037:            bottom(), top(), end(),
coleenp@4037:            vs->high_boundary());
coleenp@4037: }
coleenp@4037: 
coleenp@4304: #ifdef ASSERT
coleenp@4037: void VirtualSpaceNode::mangle() {
coleenp@4037:   size_t word_size = capacity_words_in_vs();
coleenp@4037:   Copy::fill_to_words((HeapWord*) low(), word_size, 0xf1f1f1f1);
coleenp@4037: }
coleenp@4304: #endif // ASSERT
coleenp@4037: 
coleenp@4037: // VirtualSpaceList methods
coleenp@4037: // Space allocated from the VirtualSpace
coleenp@4037: 
coleenp@4037: VirtualSpaceList::~VirtualSpaceList() {
coleenp@4037:   VirtualSpaceListIterator iter(virtual_space_list());
coleenp@4037:   while (iter.repeat()) {
coleenp@4037:     VirtualSpaceNode* vsl = iter.get_next();
coleenp@4037:     delete vsl;
coleenp@4037:   }
coleenp@4037: }
coleenp@4037: 
stefank@5704: void VirtualSpaceList::inc_reserved_words(size_t v) {
jmasa@5007:   assert_lock_strong(SpaceManager::expand_lock());
stefank@5704:   _reserved_words = _reserved_words + v;
jmasa@5007: }
stefank@5704: void VirtualSpaceList::dec_reserved_words(size_t v) {
jmasa@5007:   assert_lock_strong(SpaceManager::expand_lock());
stefank@5704:   _reserved_words = _reserved_words - v;
stefank@5704: }
stefank@5704: 
stefank@5863: #define assert_committed_below_limit()                             \
stefank@5863:   assert(MetaspaceAux::committed_bytes() <= MaxMetaspaceSize,      \
stefank@5863:       err_msg("Too much committed memory. Committed: " SIZE_FORMAT \
stefank@5863:               " limit (MaxMetaspaceSize): " SIZE_FORMAT,           \
stefank@5863:           MetaspaceAux::committed_bytes(), MaxMetaspaceSize));
stefank@5863: 
stefank@5704: void VirtualSpaceList::inc_committed_words(size_t v) {
stefank@5704:   assert_lock_strong(SpaceManager::expand_lock());
stefank@5704:   _committed_words = _committed_words + v;
stefank@5863: 
stefank@5863:   assert_committed_below_limit();
stefank@5704: }
stefank@5704: void VirtualSpaceList::dec_committed_words(size_t v) {
stefank@5704:   assert_lock_strong(SpaceManager::expand_lock());
stefank@5704:   _committed_words = _committed_words - v;
stefank@5863: 
stefank@5863:   assert_committed_below_limit();
jmasa@5007: }
jmasa@5007: 
jmasa@5007: void VirtualSpaceList::inc_virtual_space_count() {
jmasa@5007:   assert_lock_strong(SpaceManager::expand_lock());
jmasa@5007:   _virtual_space_count++;
jmasa@5007: }
jmasa@5007: void VirtualSpaceList::dec_virtual_space_count() {
jmasa@5007:   assert_lock_strong(SpaceManager::expand_lock());
jmasa@5007:   _virtual_space_count--;
jmasa@5007: }
jmasa@5007: 
jmasa@5007: void ChunkManager::remove_chunk(Metachunk* chunk) {
jmasa@5007:   size_t word_size = chunk->word_size();
jmasa@5007:   ChunkIndex index = list_index(word_size);
jmasa@5007:   if (index != HumongousIndex) {
jmasa@5007:     free_chunks(index)->remove_chunk(chunk);
jmasa@5007:   } else {
jmasa@5007:     humongous_dictionary()->remove_chunk(chunk);
jmasa@5007:   }
jmasa@5007: 
jmasa@5007:   // Chunk is being removed from the chunks free list.
stefank@5941:   dec_free_chunks_total(chunk->word_size());
jmasa@5007: }
jmasa@5007: 
jmasa@5007: // Walk the list of VirtualSpaceNodes and delete
jmasa@5007: // nodes with a 0 container_count.  Remove Metachunks in
jmasa@5007: // the node from their respective freelists.
stefank@5771: void VirtualSpaceList::purge(ChunkManager* chunk_manager) {
coleenp@6678:   assert(SafepointSynchronize::is_at_safepoint(), "must be called at safepoint for contains to work");
jmasa@5007:   assert_lock_strong(SpaceManager::expand_lock());
jmasa@5007:   // Don't use a VirtualSpaceListIterator because this
jmasa@5007:   // list is being changed and a straightforward use of an iterator is not safe.
jmasa@5007:   VirtualSpaceNode* purged_vsl = NULL;
jmasa@5007:   VirtualSpaceNode* prev_vsl = virtual_space_list();
jmasa@5007:   VirtualSpaceNode* next_vsl = prev_vsl;
jmasa@5007:   while (next_vsl != NULL) {
jmasa@5007:     VirtualSpaceNode* vsl = next_vsl;
jmasa@5007:     next_vsl = vsl->next();
jmasa@5007:     // Don't free the current virtual space since it will likely
jmasa@5007:     // be needed soon.
jmasa@5007:     if (vsl->container_count() == 0 && vsl != current_virtual_space()) {
jmasa@5007:       // Unlink it from the list
jmasa@5007:       if (prev_vsl == vsl) {
stefank@5863:         // This is the case of the current node being the first node.
stefank@5863:         assert(vsl == virtual_space_list(), "Expected to be the first node");
jmasa@5007:         set_virtual_space_list(vsl->next());
jmasa@5007:       } else {
jmasa@5007:         prev_vsl->set_next(vsl->next());
jmasa@5007:       }
jmasa@5007: 
stefank@5771:       vsl->purge(chunk_manager);
stefank@5704:       dec_reserved_words(vsl->reserved_words());
stefank@5704:       dec_committed_words(vsl->committed_words());
jmasa@5007:       dec_virtual_space_count();
jmasa@5007:       purged_vsl = vsl;
jmasa@5007:       delete vsl;
jmasa@5007:     } else {
jmasa@5007:       prev_vsl = vsl;
jmasa@5007:     }
jmasa@5007:   }
jmasa@5007: #ifdef ASSERT
jmasa@5007:   if (purged_vsl != NULL) {
coleenp@6678:     // List should be stable enough to use an iterator here.
coleenp@6678:     VirtualSpaceListIterator iter(virtual_space_list());
jmasa@5007:     while (iter.repeat()) {
jmasa@5007:       VirtualSpaceNode* vsl = iter.get_next();
jmasa@5007:       assert(vsl != purged_vsl, "Purge of vsl failed");
jmasa@5007:     }
jmasa@5007:   }
jmasa@5007: #endif
jmasa@5007: }
jmasa@5007: 
coleenp@6678: 
coleenp@6678: // This function looks at the mmap regions in the metaspace without locking.
coleenp@6678: // The chunks are added with store ordering and not deleted except for at
coleenp@6678: // unloading time during a safepoint.
coleenp@6678: bool VirtualSpaceList::contains(const void* ptr) {
coleenp@6678:   // List should be stable enough to use an iterator here because removing virtual
coleenp@6678:   // space nodes is only allowed at a safepoint.
coleenp@6678:   VirtualSpaceListIterator iter(virtual_space_list());
coleenp@6678:   while (iter.repeat()) {
coleenp@6678:     VirtualSpaceNode* vsn = iter.get_next();
coleenp@6678:     if (vsn->contains(ptr)) {
coleenp@6678:       return true;
coleenp@6678:     }
coleenp@6678:   }
coleenp@6678:   return false;
coleenp@6678: }
coleenp@6678: 
mgerdin@6004: void VirtualSpaceList::retire_current_virtual_space() {
mgerdin@6004:   assert_lock_strong(SpaceManager::expand_lock());
mgerdin@6004: 
mgerdin@6004:   VirtualSpaceNode* vsn = current_virtual_space();
mgerdin@6004: 
mgerdin@6004:   ChunkManager* cm = is_class() ? Metaspace::chunk_manager_class() :
mgerdin@6004:                                   Metaspace::chunk_manager_metadata();
mgerdin@6004: 
mgerdin@6004:   vsn->retire(cm);
mgerdin@6004: }
mgerdin@6004: 
mgerdin@6004: void VirtualSpaceNode::retire(ChunkManager* chunk_manager) {
mgerdin@6004:   for (int i = (int)MediumIndex; i >= (int)ZeroIndex; --i) {
mgerdin@6004:     ChunkIndex index = (ChunkIndex)i;
mgerdin@6004:     size_t chunk_size = chunk_manager->free_chunks(index)->size();
mgerdin@6004: 
mgerdin@6004:     while (free_words_in_vs() >= chunk_size) {
mgerdin@6004:       DEBUG_ONLY(verify_container_count();)
mgerdin@6004:       Metachunk* chunk = get_chunk_vs(chunk_size);
mgerdin@6004:       assert(chunk != NULL, "allocation should have been successful");
mgerdin@6004: 
mgerdin@6004:       chunk_manager->return_chunks(index, chunk);
mgerdin@6004:       chunk_manager->inc_free_chunks_total(chunk_size);
mgerdin@6004:       DEBUG_ONLY(verify_container_count();)
mgerdin@6004:     }
mgerdin@6004:   }
mgerdin@6004:   assert(free_words_in_vs() == 0, "should be empty now");
mgerdin@6004: }
mgerdin@6004: 
stefank@5863: VirtualSpaceList::VirtualSpaceList(size_t word_size) :
coleenp@4037:                                    _is_class(false),
coleenp@4037:                                    _virtual_space_list(NULL),
coleenp@4037:                                    _current_virtual_space(NULL),
stefank@5704:                                    _reserved_words(0),
stefank@5704:                                    _committed_words(0),
coleenp@4037:                                    _virtual_space_count(0) {
coleenp@4037:   MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@4037:                    Mutex::_no_safepoint_check_flag);
stefank@5863:   create_new_virtual_space(word_size);
coleenp@4037: }
coleenp@4037: 
coleenp@4037: VirtualSpaceList::VirtualSpaceList(ReservedSpace rs) :
coleenp@4037:                                    _is_class(true),
coleenp@4037:                                    _virtual_space_list(NULL),
coleenp@4037:                                    _current_virtual_space(NULL),
stefank@5704:                                    _reserved_words(0),
stefank@5704:                                    _committed_words(0),
coleenp@4037:                                    _virtual_space_count(0) {
coleenp@4037:   MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@4037:                    Mutex::_no_safepoint_check_flag);
coleenp@4037:   VirtualSpaceNode* class_entry = new VirtualSpaceNode(rs);
coleenp@4037:   bool succeeded = class_entry->initialize();
stefank@5863:   if (succeeded) {
stefank@5863:     link_vs(class_entry);
stefank@5863:   }
coleenp@4037: }
coleenp@4037: 
jmasa@5015: size_t VirtualSpaceList::free_bytes() {
jmasa@5015:   return virtual_space_list()->free_words_in_vs() * BytesPerWord;
jmasa@5015: }
jmasa@5015: 
coleenp@4037: // Allocate another meta virtual space and add it to the list.
stefank@5863: bool VirtualSpaceList::create_new_virtual_space(size_t vs_word_size) {
coleenp@4037:   assert_lock_strong(SpaceManager::expand_lock());
stefank@5863: 
stefank@5863:   if (is_class()) {
stefank@5863:     assert(false, "We currently don't support more than one VirtualSpace for"
stefank@5863:                   " the compressed class space. The initialization of the"
stefank@5863:                   " CCS uses another code path and should not hit this path.");
coleenp@4037:     return false;
coleenp@4037:   }
stefank@5863: 
stefank@5863:   if (vs_word_size == 0) {
stefank@5863:     assert(false, "vs_word_size should always be at least _reserve_alignment large.");
stefank@5863:     return false;
stefank@5863:   }
stefank@5863: 
coleenp@4037:   // Reserve the space
coleenp@4037:   size_t vs_byte_size = vs_word_size * BytesPerWord;
stefank@5863:   assert_is_size_aligned(vs_byte_size, Metaspace::reserve_alignment());
coleenp@4037: 
coleenp@4037:   // Allocate the meta virtual space and initialize it.
coleenp@4037:   VirtualSpaceNode* new_entry = new VirtualSpaceNode(vs_byte_size);
coleenp@4037:   if (!new_entry->initialize()) {
coleenp@4037:     delete new_entry;
coleenp@4037:     return false;
coleenp@4037:   } else {
stefank@5863:     assert(new_entry->reserved_words() == vs_word_size,
stefank@5863:         "Reserved memory size differs from requested memory size");
coleenp@6678:     // ensure lock-free iteration sees fully initialized node
coleenp@6678:     OrderAccess::storestore();
stefank@5704:     link_vs(new_entry);
coleenp@4037:     return true;
coleenp@4037:   }
coleenp@4037: }
coleenp@4037: 
stefank@5704: void VirtualSpaceList::link_vs(VirtualSpaceNode* new_entry) {
coleenp@4037:   if (virtual_space_list() == NULL) {
coleenp@4037:       set_virtual_space_list(new_entry);
coleenp@4037:   } else {
coleenp@4037:     current_virtual_space()->set_next(new_entry);
coleenp@4037:   }
coleenp@4037:   set_current_virtual_space(new_entry);
stefank@5704:   inc_reserved_words(new_entry->reserved_words());
stefank@5704:   inc_committed_words(new_entry->committed_words());
coleenp@4037:   inc_virtual_space_count();
coleenp@4037: #ifdef ASSERT
coleenp@4037:   new_entry->mangle();
coleenp@4037: #endif
coleenp@4037:   if (TraceMetavirtualspaceAllocation && Verbose) {
coleenp@4037:     VirtualSpaceNode* vsl = current_virtual_space();
stefank@5708:     vsl->print_on(gclog_or_tty);
coleenp@4037:   }
coleenp@4037: }
coleenp@4037: 
stefank@5863: bool VirtualSpaceList::expand_node_by(VirtualSpaceNode* node,
stefank@5863:                                       size_t min_words,
stefank@5863:                                       size_t preferred_words) {
stefank@5704:   size_t before = node->committed_words();
stefank@5704: 
stefank@5863:   bool result = node->expand_by(min_words, preferred_words);
stefank@5704: 
stefank@5704:   size_t after = node->committed_words();
stefank@5704: 
stefank@5704:   // after and before can be the same if the memory was pre-committed.
stefank@5863:   assert(after >= before, "Inconsistency");
stefank@5704:   inc_committed_words(after - before);
stefank@5704: 
stefank@5704:   return result;
stefank@5704: }
stefank@5704: 
stefank@5863: bool VirtualSpaceList::expand_by(size_t min_words, size_t preferred_words) {
stefank@5863:   assert_is_size_aligned(min_words,       Metaspace::commit_alignment_words());
stefank@5863:   assert_is_size_aligned(preferred_words, Metaspace::commit_alignment_words());
stefank@5863:   assert(min_words <= preferred_words, "Invalid arguments");
stefank@5863: 
stefank@5863:   if (!MetaspaceGC::can_expand(min_words, this->is_class())) {
stefank@5863:     return  false;
stefank@5863:   }
stefank@5863: 
stefank@5863:   size_t allowed_expansion_words = MetaspaceGC::allowed_expansion();
stefank@5863:   if (allowed_expansion_words < min_words) {
stefank@5863:     return false;
stefank@5863:   }
stefank@5863: 
stefank@5863:   size_t max_expansion_words = MIN2(preferred_words, allowed_expansion_words);
stefank@5863: 
stefank@5863:   // Commit more memory from the the current virtual space.
stefank@5863:   bool vs_expanded = expand_node_by(current_virtual_space(),
stefank@5863:                                     min_words,
stefank@5863:                                     max_expansion_words);
stefank@5863:   if (vs_expanded) {
stefank@5863:     return true;
stefank@5863:   }
mgerdin@6004:   retire_current_virtual_space();
stefank@5863: 
stefank@5863:   // Get another virtual space.
stefank@5863:   size_t grow_vs_words = MAX2((size_t)VirtualSpaceSize, preferred_words);
stefank@5863:   grow_vs_words = align_size_up(grow_vs_words, Metaspace::reserve_alignment_words());
stefank@5863: 
stefank@5863:   if (create_new_virtual_space(grow_vs_words)) {
stefank@5863:     if (current_virtual_space()->is_pre_committed()) {
stefank@5863:       // The memory was pre-committed, so we are done here.
stefank@5863:       assert(min_words <= current_virtual_space()->committed_words(),
stefank@5863:           "The new VirtualSpace was pre-committed, so it"
stefank@5863:           "should be large enough to fit the alloc request.");
stefank@5863:       return true;
stefank@5863:     }
stefank@5863: 
stefank@5863:     return expand_node_by(current_virtual_space(),
stefank@5863:                           min_words,
stefank@5863:                           max_expansion_words);
stefank@5863:   }
stefank@5863: 
stefank@5863:   return false;
stefank@5863: }
stefank@5863: 
coleenp@4037: Metachunk* VirtualSpaceList::get_new_chunk(size_t word_size,
jmasa@4382:                                            size_t grow_chunks_by_words,
jmasa@4382:                                            size_t medium_chunk_bunch) {
coleenp@4037: 
stefank@5771:   // Allocate a chunk out of the current virtual space.
stefank@5771:   Metachunk* next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words);
coleenp@4037: 
stefank@5863:   if (next != NULL) {
stefank@5863:     return next;
coleenp@4037:   }
coleenp@4037: 
stefank@5863:   // The expand amount is currently only determined by the requested sizes
stefank@5863:   // and not how much committed memory is left in the current virtual space.
stefank@5863: 
stefank@5863:   size_t min_word_size       = align_size_up(grow_chunks_by_words, Metaspace::commit_alignment_words());
stefank@5863:   size_t preferred_word_size = align_size_up(medium_chunk_bunch,   Metaspace::commit_alignment_words());
stefank@5863:   if (min_word_size >= preferred_word_size) {
stefank@5863:     // Can happen when humongous chunks are allocated.
stefank@5863:     preferred_word_size = min_word_size;
stefank@5863:   }
stefank@5863: 
stefank@5863:   bool expanded = expand_by(min_word_size, preferred_word_size);
stefank@5863:   if (expanded) {
stefank@5863:     next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words);
stefank@5863:     assert(next != NULL, "The allocation was expected to succeed after the expansion");
stefank@5863:   }
stefank@5863: 
stefank@5863:    return next;
jmasa@4382: }
jmasa@4382: 
coleenp@4037: void VirtualSpaceList::print_on(outputStream* st) const {
coleenp@4037:   if (TraceMetadataChunkAllocation && Verbose) {
coleenp@4037:     VirtualSpaceListIterator iter(virtual_space_list());
coleenp@4037:     while (iter.repeat()) {
coleenp@4037:       VirtualSpaceNode* node = iter.get_next();
coleenp@4037:       node->print_on(st);
coleenp@4037:     }
coleenp@4037:   }
coleenp@4037: }
coleenp@4037: 
coleenp@4037: // MetaspaceGC methods
coleenp@4037: 
coleenp@4037: // VM_CollectForMetadataAllocation is the vm operation used to GC.
coleenp@4037: // Within the VM operation after the GC the attempt to allocate the metadata
coleenp@4037: // should succeed.  If the GC did not free enough space for the metaspace
coleenp@4037: // allocation, the HWM is increased so that another virtualspace will be
coleenp@4037: // allocated for the metadata.  With perm gen the increase in the perm
coleenp@4037: // gen had bounds, MinMetaspaceExpansion and MaxMetaspaceExpansion.  The
coleenp@4037: // metaspace policy uses those as the small and large steps for the HWM.
coleenp@4037: //
coleenp@4037: // After the GC the compute_new_size() for MetaspaceGC is called to
coleenp@4037: // resize the capacity of the metaspaces.  The current implementation
jmasa@5015: // is based on the flags MinMetaspaceFreeRatio and MaxMetaspaceFreeRatio used
coleenp@4037: // to resize the Java heap by some GC's.  New flags can be implemented
jmasa@5015: // if really needed.  MinMetaspaceFreeRatio is used to calculate how much
coleenp@4037: // free space is desirable in the metaspace capacity to decide how much
jmasa@4581: // to increase the HWM.  MaxMetaspaceFreeRatio is used to decide how much
coleenp@4037: // free space is desirable in the metaspace capacity before decreasing
coleenp@4037: // the HWM.
coleenp@4037: 
coleenp@4037: // Calculate the amount to increase the high water mark (HWM).
coleenp@4037: // Increase by a minimum amount (MinMetaspaceExpansion) so that
coleenp@4037: // another expansion is not requested too soon.  If that is not
stefank@5863: // enough to satisfy the allocation, increase by MaxMetaspaceExpansion.
stefank@5863: // If that is still not enough, expand by the size of the allocation
stefank@5863: // plus some.
stefank@5863: size_t MetaspaceGC::delta_capacity_until_GC(size_t bytes) {
stefank@5863:   size_t min_delta = MinMetaspaceExpansion;
stefank@5863:   size_t max_delta = MaxMetaspaceExpansion;
stefank@5863:   size_t delta = align_size_up(bytes, Metaspace::commit_alignment());
stefank@5863: 
stefank@5863:   if (delta <= min_delta) {
stefank@5863:     delta = min_delta;
stefank@5863:   } else if (delta <= max_delta) {
coleenp@4037:     // Don't want to hit the high water mark on the next
coleenp@4037:     // allocation so make the delta greater than just enough
coleenp@4037:     // for this allocation.
stefank@5863:     delta = max_delta;
stefank@5863:   } else {
stefank@5863:     // This allocation is large but the next ones are probably not
stefank@5863:     // so increase by the minimum.
stefank@5863:     delta = delta + min_delta;
coleenp@4037:   }
stefank@5863: 
stefank@5863:   assert_is_size_aligned(delta, Metaspace::commit_alignment());
stefank@5863: 
stefank@5863:   return delta;
coleenp@4037: }
coleenp@4037: 
stefank@5863: size_t MetaspaceGC::capacity_until_GC() {
stefank@5863:   size_t value = (size_t)OrderAccess::load_ptr_acquire(&_capacity_until_GC);
stefank@5863:   assert(value >= MetaspaceSize, "Not initialied properly?");
stefank@5863:   return value;
stefank@5863: }
stefank@5863: 
ehelin@7254: bool MetaspaceGC::inc_capacity_until_GC(size_t v, size_t* new_cap_until_GC, size_t* old_cap_until_GC) {
stefank@5863:   assert_is_size_aligned(v, Metaspace::commit_alignment());
stefank@5863: 
ehelin@7254:   size_t capacity_until_GC = (size_t) _capacity_until_GC;
ehelin@7254:   size_t new_value = capacity_until_GC + v;
ehelin@7254: 
ehelin@7254:   if (new_value < capacity_until_GC) {
ehelin@7254:     // The addition wrapped around, set new_value to aligned max value.
ehelin@7254:     new_value = align_size_down(max_uintx, Metaspace::commit_alignment());
ehelin@7254:   }
ehelin@7254: 
ehelin@7254:   intptr_t expected = (intptr_t) capacity_until_GC;
ehelin@7254:   intptr_t actual = Atomic::cmpxchg_ptr((intptr_t) new_value, &_capacity_until_GC, expected);
ehelin@7254: 
ehelin@7254:   if (expected != actual) {
ehelin@7254:     return false;
ehelin@7254:   }
ehelin@7254: 
ehelin@7254:   if (new_cap_until_GC != NULL) {
ehelin@7254:     *new_cap_until_GC = new_value;
ehelin@7254:   }
ehelin@7254:   if (old_cap_until_GC != NULL) {
ehelin@7254:     *old_cap_until_GC = capacity_until_GC;
ehelin@7254:   }
ehelin@7254:   return true;
stefank@5863: }
stefank@5863: 
stefank@5863: size_t MetaspaceGC::dec_capacity_until_GC(size_t v) {
stefank@5863:   assert_is_size_aligned(v, Metaspace::commit_alignment());
stefank@5863: 
stefank@5863:   return (size_t)Atomic::add_ptr(-(intptr_t)v, &_capacity_until_GC);
stefank@5863: }
stefank@5863: 
ehelin@6722: void MetaspaceGC::initialize() {
ehelin@6722:   // Set the high-water mark to MaxMetapaceSize during VM initializaton since
ehelin@6722:   // we can't do a GC during initialization.
ehelin@6722:   _capacity_until_GC = MaxMetaspaceSize;
ehelin@6722: }
ehelin@6722: 
ehelin@6722: void MetaspaceGC::post_initialize() {
ehelin@6722:   // Reset the high-water mark once the VM initialization is done.
ehelin@6722:   _capacity_until_GC = MAX2(MetaspaceAux::committed_bytes(), MetaspaceSize);
ehelin@6722: }
ehelin@6722: 
stefank@5863: bool MetaspaceGC::can_expand(size_t word_size, bool is_class) {
stefank@5863:   // Check if the compressed class space is full.
stefank@5863:   if (is_class && Metaspace::using_class_space()) {
stefank@5863:     size_t class_committed = MetaspaceAux::committed_bytes(Metaspace::ClassType);
stefank@5863:     if (class_committed + word_size * BytesPerWord > CompressedClassSpaceSize) {
coleenp@5337:       return false;
coleenp@5337:     }
mgerdin@4790:   }
coleenp@4037: 
stefank@5863:   // Check if the user has imposed a limit on the metaspace memory.
stefank@5863:   size_t committed_bytes = MetaspaceAux::committed_bytes();
stefank@5863:   if (committed_bytes + word_size * BytesPerWord > MaxMetaspaceSize) {
stefank@5863:     return false;
coleenp@4037:   }
coleenp@4037: 
stefank@5863:   return true;
stefank@5863: }
stefank@5863: 
stefank@5863: size_t MetaspaceGC::allowed_expansion() {
stefank@5863:   size_t committed_bytes = MetaspaceAux::committed_bytes();
ehelin@6722:   size_t capacity_until_gc = capacity_until_GC();
ehelin@6722: 
ehelin@6722:   assert(capacity_until_gc >= committed_bytes,
ehelin@6722:         err_msg("capacity_until_gc: " SIZE_FORMAT " < committed_bytes: " SIZE_FORMAT,
ehelin@6722:                 capacity_until_gc, committed_bytes));
stefank@5863: 
stefank@5863:   size_t left_until_max  = MaxMetaspaceSize - committed_bytes;
stefank@5863:   size_t left_until_GC = capacity_until_gc - committed_bytes;
stefank@5863:   size_t left_to_commit = MIN2(left_until_GC, left_until_max);
stefank@5863: 
stefank@5863:   return left_to_commit / BytesPerWord;
coleenp@4037: }
coleenp@4037: 
coleenp@4037: void MetaspaceGC::compute_new_size() {
coleenp@4037:   assert(_shrink_factor <= 100, "invalid shrink factor");
coleenp@4037:   uint current_shrink_factor = _shrink_factor;
coleenp@4037:   _shrink_factor = 0;
coleenp@4037: 
ehelin@6722:   // Using committed_bytes() for used_after_gc is an overestimation, since the
ehelin@6722:   // chunk free lists are included in committed_bytes() and the memory in an
ehelin@6722:   // un-fragmented chunk free list is available for future allocations.
ehelin@6722:   // However, if the chunk free lists becomes fragmented, then the memory may
ehelin@6722:   // not be available for future allocations and the memory is therefore "in use".
ehelin@6722:   // Including the chunk free lists in the definition of "in use" is therefore
ehelin@6722:   // necessary. Not including the chunk free lists can cause capacity_until_GC to
ehelin@6722:   // shrink below committed_bytes() and this has caused serious bugs in the past.
ehelin@6722:   const size_t used_after_gc = MetaspaceAux::committed_bytes();
jmasa@5015:   const size_t capacity_until_GC = MetaspaceGC::capacity_until_GC();
coleenp@4037: 
jmasa@4581:   const double minimum_free_percentage = MinMetaspaceFreeRatio / 100.0;
coleenp@4037:   const double maximum_used_percentage = 1.0 - minimum_free_percentage;
coleenp@4037: 
coleenp@4037:   const double min_tmp = used_after_gc / maximum_used_percentage;
coleenp@4037:   size_t minimum_desired_capacity =
coleenp@4037:     (size_t)MIN2(min_tmp, double(max_uintx));
coleenp@4037:   // Don't shrink less than the initial generation size
coleenp@4037:   minimum_desired_capacity = MAX2(minimum_desired_capacity,
coleenp@4037:                                   MetaspaceSize);
coleenp@4037: 
coleenp@4037:   if (PrintGCDetails && Verbose) {
coleenp@4037:     gclog_or_tty->print_cr("\nMetaspaceGC::compute_new_size: ");
coleenp@4037:     gclog_or_tty->print_cr("  "
coleenp@4037:                   "  minimum_free_percentage: %6.2f"
coleenp@4037:                   "  maximum_used_percentage: %6.2f",
coleenp@4037:                   minimum_free_percentage,
coleenp@4037:                   maximum_used_percentage);
coleenp@4037:     gclog_or_tty->print_cr("  "
jmasa@5015:                   "   used_after_gc       : %6.1fKB",
jmasa@5015:                   used_after_gc / (double) K);
coleenp@4037:   }
coleenp@4037: 
coleenp@4037: 
jmasa@5015:   size_t shrink_bytes = 0;
coleenp@4037:   if (capacity_until_GC < minimum_desired_capacity) {
coleenp@4037:     // If we have less capacity below the metaspace HWM, then
coleenp@4037:     // increment the HWM.
coleenp@4037:     size_t expand_bytes = minimum_desired_capacity - capacity_until_GC;
stefank@5863:     expand_bytes = align_size_up(expand_bytes, Metaspace::commit_alignment());
coleenp@4037:     // Don't expand unless it's significant
coleenp@4037:     if (expand_bytes >= MinMetaspaceExpansion) {
ehelin@7254:       size_t new_capacity_until_GC = 0;
ehelin@7254:       bool succeeded = MetaspaceGC::inc_capacity_until_GC(expand_bytes, &new_capacity_until_GC);
ehelin@7254:       assert(succeeded, "Should always succesfully increment HWM when at safepoint");
ehelin@7254: 
ehelin@6417:       Metaspace::tracer()->report_gc_threshold(capacity_until_GC,
ehelin@6417:                                                new_capacity_until_GC,
ehelin@6417:                                                MetaspaceGCThresholdUpdater::ComputeNewSize);
ehelin@6417:       if (PrintGCDetails && Verbose) {
ehelin@6417:         gclog_or_tty->print_cr("    expanding:"
ehelin@6417:                       "  minimum_desired_capacity: %6.1fKB"
ehelin@6417:                       "  expand_bytes: %6.1fKB"
ehelin@6417:                       "  MinMetaspaceExpansion: %6.1fKB"
ehelin@6417:                       "  new metaspace HWM:  %6.1fKB",
ehelin@6417:                       minimum_desired_capacity / (double) K,
ehelin@6417:                       expand_bytes / (double) K,
ehelin@6417:                       MinMetaspaceExpansion / (double) K,
ehelin@6417:                       new_capacity_until_GC / (double) K);
ehelin@6417:       }
coleenp@4037:     }
coleenp@4037:     return;
coleenp@4037:   }
coleenp@4037: 
coleenp@4037:   // No expansion, now see if we want to shrink
coleenp@4037:   // We would never want to shrink more than this
jmasa@5015:   size_t max_shrink_bytes = capacity_until_GC - minimum_desired_capacity;
jmasa@5015:   assert(max_shrink_bytes >= 0, err_msg("max_shrink_bytes " SIZE_FORMAT,
jmasa@5015:     max_shrink_bytes));
coleenp@4037: 
coleenp@4037:   // Should shrinking be considered?
jmasa@4581:   if (MaxMetaspaceFreeRatio < 100) {
jmasa@4581:     const double maximum_free_percentage = MaxMetaspaceFreeRatio / 100.0;
coleenp@4037:     const double minimum_used_percentage = 1.0 - maximum_free_percentage;
coleenp@4037:     const double max_tmp = used_after_gc / minimum_used_percentage;
coleenp@4037:     size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(max_uintx));
coleenp@4037:     maximum_desired_capacity = MAX2(maximum_desired_capacity,
coleenp@4037:                                     MetaspaceSize);
jmasa@5015:     if (PrintGCDetails && Verbose) {
coleenp@4037:       gclog_or_tty->print_cr("  "
coleenp@4037:                              "  maximum_free_percentage: %6.2f"
coleenp@4037:                              "  minimum_used_percentage: %6.2f",
coleenp@4037:                              maximum_free_percentage,
coleenp@4037:                              minimum_used_percentage);
coleenp@4037:       gclog_or_tty->print_cr("  "
jmasa@5015:                              "  minimum_desired_capacity: %6.1fKB"
jmasa@5015:                              "  maximum_desired_capacity: %6.1fKB",
coleenp@4037:                              minimum_desired_capacity / (double) K,
coleenp@4037:                              maximum_desired_capacity / (double) K);
coleenp@4037:     }
coleenp@4037: 
coleenp@4037:     assert(minimum_desired_capacity <= maximum_desired_capacity,
coleenp@4037:            "sanity check");
coleenp@4037: 
coleenp@4037:     if (capacity_until_GC > maximum_desired_capacity) {
coleenp@4037:       // Capacity too large, compute shrinking size
jmasa@5015:       shrink_bytes = capacity_until_GC - maximum_desired_capacity;
coleenp@4037:       // We don't want shrink all the way back to initSize if people call
coleenp@4037:       // System.gc(), because some programs do that between "phases" and then
coleenp@4037:       // we'd just have to grow the heap up again for the next phase.  So we
coleenp@4037:       // damp the shrinking: 0% on the first call, 10% on the second call, 40%
coleenp@4037:       // on the third call, and 100% by the fourth call.  But if we recompute
coleenp@4037:       // size without shrinking, it goes back to 0%.
jmasa@5015:       shrink_bytes = shrink_bytes / 100 * current_shrink_factor;
stefank@5863: 
stefank@5863:       shrink_bytes = align_size_down(shrink_bytes, Metaspace::commit_alignment());
stefank@5863: 
jmasa@5015:       assert(shrink_bytes <= max_shrink_bytes,
coleenp@4037:         err_msg("invalid shrink size " SIZE_FORMAT " not <= " SIZE_FORMAT,
jmasa@5015:           shrink_bytes, max_shrink_bytes));
coleenp@4037:       if (current_shrink_factor == 0) {
coleenp@4037:         _shrink_factor = 10;
coleenp@4037:       } else {
coleenp@4037:         _shrink_factor = MIN2(current_shrink_factor * 4, (uint) 100);
coleenp@4037:       }
coleenp@4037:       if (PrintGCDetails && Verbose) {
coleenp@4037:         gclog_or_tty->print_cr("  "
coleenp@4037:                       "  shrinking:"
coleenp@4037:                       "  initSize: %.1fK"
coleenp@4037:                       "  maximum_desired_capacity: %.1fK",
coleenp@4037:                       MetaspaceSize / (double) K,
coleenp@4037:                       maximum_desired_capacity / (double) K);
coleenp@4037:         gclog_or_tty->print_cr("  "
jmasa@5015:                       "  shrink_bytes: %.1fK"
coleenp@4037:                       "  current_shrink_factor: %d"
coleenp@4037:                       "  new shrink factor: %d"
coleenp@4037:                       "  MinMetaspaceExpansion: %.1fK",
jmasa@5015:                       shrink_bytes / (double) K,
coleenp@4037:                       current_shrink_factor,
coleenp@4037:                       _shrink_factor,
coleenp@4037:                       MinMetaspaceExpansion / (double) K);
coleenp@4037:       }
coleenp@4037:     }
coleenp@4037:   }
coleenp@4037: 
coleenp@4037:   // Don't shrink unless it's significant
jmasa@5015:   if (shrink_bytes >= MinMetaspaceExpansion &&
jmasa@5015:       ((capacity_until_GC - shrink_bytes) >= MetaspaceSize)) {
ehelin@6417:     size_t new_capacity_until_GC = MetaspaceGC::dec_capacity_until_GC(shrink_bytes);
ehelin@6417:     Metaspace::tracer()->report_gc_threshold(capacity_until_GC,
ehelin@6417:                                              new_capacity_until_GC,
ehelin@6417:                                              MetaspaceGCThresholdUpdater::ComputeNewSize);
coleenp@4037:   }
coleenp@4037: }
coleenp@4037: 
coleenp@4037: // Metadebug methods
coleenp@4037: 
coleenp@4037: void Metadebug::init_allocation_fail_alot_count() {
coleenp@4037:   if (MetadataAllocationFailALot) {
coleenp@4037:     _allocation_fail_alot_count =
coleenp@4037:       1+(long)((double)MetadataAllocationFailALotInterval*os::random()/(max_jint+1.0));
coleenp@4037:   }
coleenp@4037: }
coleenp@4037: 
coleenp@4037: #ifdef ASSERT
coleenp@4037: bool Metadebug::test_metadata_failure() {
coleenp@4037:   if (MetadataAllocationFailALot &&
coleenp@4037:       Threads::is_vm_complete()) {
coleenp@4037:     if (_allocation_fail_alot_count > 0) {
coleenp@4037:       _allocation_fail_alot_count--;
coleenp@4037:     } else {
coleenp@4037:       if (TraceMetadataChunkAllocation && Verbose) {
coleenp@4037:         gclog_or_tty->print_cr("Metadata allocation failing for "
coleenp@4037:                                "MetadataAllocationFailALot");
coleenp@4037:       }
coleenp@4037:       init_allocation_fail_alot_count();
coleenp@4037:       return true;
coleenp@4037:     }
coleenp@4037:   }
coleenp@4037:   return false;
coleenp@4037: }
coleenp@4037: #endif
coleenp@4037: 
coleenp@4037: // ChunkManager methods
coleenp@4037: 
ehelin@5703: size_t ChunkManager::free_chunks_total_words() {
coleenp@4037:   return _free_chunks_total;
coleenp@4037: }
coleenp@4037: 
ehelin@5703: size_t ChunkManager::free_chunks_total_bytes() {
ehelin@5703:   return free_chunks_total_words() * BytesPerWord;
coleenp@4037: }
coleenp@4037: 
coleenp@4037: size_t ChunkManager::free_chunks_count() {
coleenp@4037: #ifdef ASSERT
coleenp@4037:   if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) {
coleenp@4037:     MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@4037:                      Mutex::_no_safepoint_check_flag);
coleenp@4037:     // This lock is only needed in debug because the verification
coleenp@4037:     // of the _free_chunks_totals walks the list of free chunks
mgerdin@4264:     slow_locked_verify_free_chunks_count();
coleenp@4037:   }
coleenp@4037: #endif
mgerdin@4264:   return _free_chunks_count;
coleenp@4037: }
coleenp@4037: 
coleenp@4037: void ChunkManager::locked_verify_free_chunks_total() {
coleenp@4037:   assert_lock_strong(SpaceManager::expand_lock());
coleenp@4037:   assert(sum_free_chunks() == _free_chunks_total,
coleenp@4037:     err_msg("_free_chunks_total " SIZE_FORMAT " is not the"
coleenp@4037:            " same as sum " SIZE_FORMAT, _free_chunks_total,
coleenp@4037:            sum_free_chunks()));
coleenp@4037: }
coleenp@4037: 
coleenp@4037: void ChunkManager::verify_free_chunks_total() {
coleenp@4037:   MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@4037:                      Mutex::_no_safepoint_check_flag);
coleenp@4037:   locked_verify_free_chunks_total();
coleenp@4037: }
coleenp@4037: 
coleenp@4037: void ChunkManager::locked_verify_free_chunks_count() {
coleenp@4037:   assert_lock_strong(SpaceManager::expand_lock());
coleenp@4037:   assert(sum_free_chunks_count() == _free_chunks_count,
coleenp@4037:     err_msg("_free_chunks_count " SIZE_FORMAT " is not the"
coleenp@4037:            " same as sum " SIZE_FORMAT, _free_chunks_count,
coleenp@4037:            sum_free_chunks_count()));
coleenp@4037: }
coleenp@4037: 
coleenp@4037: void ChunkManager::verify_free_chunks_count() {
coleenp@4037: #ifdef ASSERT
coleenp@4037:   MutexLockerEx cl(SpaceManager::expand_lock(),
coleenp@4037:                      Mutex::_no_safepoint_check_flag);
coleenp@4037:   locked_verify_free_chunks_count();
coleenp@4037: #endif
coleenp@4037: }
coleenp@4037: 
coleenp@4037: void ChunkManager::verify() {
mgerdin@4264:   MutexLockerEx cl(SpaceManager::expand_lock(),
mgerdin@4264:                      Mutex::_no_safepoint_check_flag);
mgerdin@4264:   locked_verify();
coleenp@4037: }
coleenp@4037: 
coleenp@4037: void ChunkManager::locked_verify() {
jmasa@4196:   locked_verify_free_chunks_count();
coleenp@4037:   locked_verify_free_chunks_total();
coleenp@4037: }
coleenp@4037: 
coleenp@4037: void ChunkManager::locked_print_free_chunks(outputStream* st) {
coleenp@4037:   assert_lock_strong(SpaceManager::expand_lock());
jmasa@4382:   st->print_cr("Free chunk total " SIZE_FORMAT "  count " SIZE_FORMAT,
coleenp@4037:                 _free_chunks_total, _free_chunks_count);
coleenp@4037: }
coleenp@4037: 
coleenp@4037: void ChunkManager::locked_print_sum_free_chunks(outputStream* st) {
coleenp@4037:   assert_lock_strong(SpaceManager::expand_lock());
jmasa@4382:   st->print_cr("Sum free chunk total " SIZE_FORMAT "  count " SIZE_FORMAT,
coleenp@4037:                 sum_free_chunks(), sum_free_chunks_count());
coleenp@4037: }
coleenp@4037: ChunkList* ChunkManager::free_chunks(ChunkIndex index) {
coleenp@4037:   return &_free_chunks[index];
coleenp@4037: }
coleenp@4037: 
coleenp@4037: // These methods that sum the free chunk lists are used in printing
coleenp@4037: // methods that are used in product builds.
coleenp@4037: size_t ChunkManager::sum_free_chunks() {
coleenp@4037:   assert_lock_strong(SpaceManager::expand_lock());
coleenp@4037:   size_t result = 0;
jmasa@4382:   for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
coleenp@4037:     ChunkList* list = free_chunks(i);
coleenp@4037: 
coleenp@4037:     if (list == NULL) {
coleenp@4037:       continue;
coleenp@4037:     }
coleenp@4037: 
jmasa@4932:     result = result + list->count() * list->size();
coleenp@4037:   }
jmasa@4196:   result = result + humongous_dictionary()->total_size();
coleenp@4037:   return result;
coleenp@4037: }
coleenp@4037: 
coleenp@4037: size_t ChunkManager::sum_free_chunks_count() {
coleenp@4037:   assert_lock_strong(SpaceManager::expand_lock());
coleenp@4037:   size_t count = 0;
jmasa@4382:   for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
coleenp@4037:     ChunkList* list = free_chunks(i);
coleenp@4037:     if (list == NULL) {
coleenp@4037:       continue;
coleenp@4037:     }
jmasa@4932:     count = count + list->count();
coleenp@4037:   }
jmasa@4196:   count = count + humongous_dictionary()->total_free_blocks();
coleenp@4037:   return count;
coleenp@4037: }
coleenp@4037: 
coleenp@4037: ChunkList* ChunkManager::find_free_chunks_list(size_t word_size) {
jmasa@4382:   ChunkIndex index = list_index(word_size);
jmasa@4382:   assert(index < HumongousIndex, "No humongous list");
jmasa@4382:   return free_chunks(index);
coleenp@4037: }
coleenp@4037: 
coleenp@4037: Metachunk* ChunkManager::free_chunks_get(size_t word_size) {
coleenp@4037:   assert_lock_strong(SpaceManager::expand_lock());
coleenp@4037: 
mgerdin@4264:   slow_locked_verify();
jmasa@4196: 
jmasa@4196:   Metachunk* chunk = NULL;
jmasa@4382:   if (list_index(word_size) != HumongousIndex) {
jmasa@4196:     ChunkList* free_list = find_free_chunks_list(word_size);
jmasa@4196:     assert(free_list != NULL, "Sanity check");
jmasa@4196: 
jmasa@4196:     chunk = free_list->head();
jmasa@4196: 
jmasa@4196:     if (chunk == NULL) {
jmasa@4196:       return NULL;
jmasa@4196:     }
jmasa@4196: 
coleenp@4037:     // Remove the chunk as the head of the list.
jmasa@4932:     free_list->remove_chunk(chunk);
jmasa@4382: 
coleenp@4037:     if (TraceMetadataChunkAllocation && Verbose) {
stefank@5708:       gclog_or_tty->print_cr("ChunkManager::free_chunks_get: free_list "
stefank@5708:                              PTR_FORMAT " head " PTR_FORMAT " size " SIZE_FORMAT,
stefank@5708:                              free_list, chunk, chunk->word_size());
coleenp@4037:     }
coleenp@4037:   } else {
jmasa@4196:     chunk = humongous_dictionary()->get_chunk(
jmasa@4196:       word_size,
jmasa@4196:       FreeBlockDictionary<Metachunk>::atLeast);
jmasa@4196: 
stefank@5863:     if (chunk == NULL) {
jmasa@4382:       return NULL;
coleenp@4037:     }
stefank@5863: 
stefank@5863:     if (TraceMetadataHumongousAllocation) {
stefank@5863:       size_t waste = chunk->word_size() - word_size;
stefank@5863:       gclog_or_tty->print_cr("Free list allocate humongous chunk size "
stefank@5863:                              SIZE_FORMAT " for requested size " SIZE_FORMAT
stefank@5863:                              " waste " SIZE_FORMAT,
stefank@5863:                              chunk->word_size(), word_size, waste);
stefank@5863:     }
coleenp@4037:   }
jmasa@4382: 
stefank@5863:   // Chunk is being removed from the chunks free list.
stefank@5941:   dec_free_chunks_total(chunk->word_size());
stefank@5863: 
jmasa@4382:   // Remove it from the links to this freelist
jmasa@4382:   chunk->set_next(NULL);
jmasa@4382:   chunk->set_prev(NULL);
jmasa@5007: #ifdef ASSERT
jmasa@5007:   // Chunk is no longer on any freelist. Setting to false make container_count_slow()
jmasa@5007:   // work.
stefank@5941:   chunk->set_is_tagged_free(false);
jmasa@5007: #endif
stefank@5771:   chunk->container()->inc_container_count();
stefank@5771: 
mgerdin@4264:   slow_locked_verify();
coleenp@4037:   return chunk;
coleenp@4037: }
coleenp@4037: 
coleenp@4037: Metachunk* ChunkManager::chunk_freelist_allocate(size_t word_size) {
coleenp@4037:   assert_lock_strong(SpaceManager::expand_lock());
mgerdin@4264:   slow_locked_verify();
coleenp@4037: 
coleenp@4037:   // Take from the beginning of the list
coleenp@4037:   Metachunk* chunk = free_chunks_get(word_size);
coleenp@4037:   if (chunk == NULL) {
coleenp@4037:     return NULL;
coleenp@4037:   }
coleenp@4037: 
jmasa@4382:   assert((word_size <= chunk->word_size()) ||
jmasa@4382:          list_index(chunk->word_size() == HumongousIndex),
jmasa@4382:          "Non-humongous variable sized chunk");
coleenp@4037:   if (TraceMetadataChunkAllocation) {
jmasa@4382:     size_t list_count;
jmasa@4382:     if (list_index(word_size) < HumongousIndex) {
jmasa@4382:       ChunkList* list = find_free_chunks_list(word_size);
jmasa@4932:       list_count = list->count();
jmasa@4382:     } else {
jmasa@4382:       list_count = humongous_dictionary()->total_count();
jmasa@4382:     }
stefank@5708:     gclog_or_tty->print("ChunkManager::chunk_freelist_allocate: " PTR_FORMAT " chunk "
stefank@5708:                         PTR_FORMAT "  size " SIZE_FORMAT " count " SIZE_FORMAT " ",
stefank@5708:                         this, chunk, chunk->word_size(), list_count);
stefank@5708:     locked_print_free_chunks(gclog_or_tty);
coleenp@4037:   }
coleenp@4037: 
coleenp@4037:   return chunk;
coleenp@4037: }
coleenp@4037: 
stefank@5771: void ChunkManager::print_on(outputStream* out) const {
jmasa@4196:   if (PrintFLSStatistics != 0) {
stefank@5771:     const_cast<ChunkManager *>(this)->humongous_dictionary()->report_statistics();
jmasa@4196:   }
jmasa@4196: }
jmasa@4196: 
coleenp@4037: // SpaceManager methods
coleenp@4037: 
jmasa@4382: void SpaceManager::get_initial_chunk_sizes(Metaspace::MetaspaceType type,
jmasa@4382:                                            size_t* chunk_word_size,
jmasa@4382:                                            size_t* class_chunk_word_size) {
jmasa@4382:   switch (type) {
jmasa@4382:   case Metaspace::BootMetaspaceType:
jmasa@4382:     *chunk_word_size = Metaspace::first_chunk_word_size();
jmasa@4382:     *class_chunk_word_size = Metaspace::first_class_chunk_word_size();
jmasa@4382:     break;
jmasa@4382:   case Metaspace::ROMetaspaceType:
jmasa@4382:     *chunk_word_size = SharedReadOnlySize / wordSize;
jmasa@4382:     *class_chunk_word_size = ClassSpecializedChunk;
jmasa@4382:     break;
jmasa@4382:   case Metaspace::ReadWriteMetaspaceType:
jmasa@4382:     *chunk_word_size = SharedReadWriteSize / wordSize;
jmasa@4382:     *class_chunk_word_size = ClassSpecializedChunk;
jmasa@4382:     break;
jmasa@4382:   case Metaspace::AnonymousMetaspaceType:
jmasa@4382:   case Metaspace::ReflectionMetaspaceType:
jmasa@4382:     *chunk_word_size = SpecializedChunk;
jmasa@4382:     *class_chunk_word_size = ClassSpecializedChunk;
jmasa@4382:     break;
jmasa@4382:   default:
jmasa@4382:     *chunk_word_size = SmallChunk;
jmasa@4382:     *class_chunk_word_size = ClassSmallChunk;
jmasa@4382:     break;
jmasa@4382:   }
mikael@4548:   assert(*chunk_word_size != 0 && *class_chunk_word_size != 0,
jmasa@4382:     err_msg("Initial chunks sizes bad: data  " SIZE_FORMAT
jmasa@4382:             " class " SIZE_FORMAT,
mikael@4548:             *chunk_word_size, *class_chunk_word_size));
jmasa@4382: }
jmasa@4382: 
coleenp@4037: size_t SpaceManager::sum_free_in_chunks_in_use() const {
coleenp@4037:   MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@4037:   size_t free = 0;
jmasa@4382:   for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@4037:     Metachunk* chunk = chunks_in_use(i);
coleenp@4037:     while (chunk != NULL) {
coleenp@4037:       free += chunk->free_word_size();
coleenp@4037:       chunk = chunk->next();
coleenp@4037:     }
coleenp@4037:   }
coleenp@4037:   return free;
coleenp@4037: }
coleenp@4037: 
coleenp@4037: size_t SpaceManager::sum_waste_in_chunks_in_use() const {
coleenp@4037:   MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@4037:   size_t result = 0;
jmasa@4382:   for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@4037:    result += sum_waste_in_chunks_in_use(i);
coleenp@4037:   }
jmasa@4196: 
coleenp@4037:   return result;
coleenp@4037: }
coleenp@4037: 
coleenp@4037: size_t SpaceManager::sum_waste_in_chunks_in_use(ChunkIndex index) const {
coleenp@4037:   size_t result = 0;
coleenp@4037:   Metachunk* chunk = chunks_in_use(index);
coleenp@4037:   // Count the free space in all the chunk but not the
coleenp@4037:   // current chunk from which allocations are still being done.
coleenp@5337:   while (chunk != NULL) {
coleenp@5337:     if (chunk != current_chunk()) {
jmasa@4196:       result += chunk->free_word_size();
coleenp@4037:     }
coleenp@5337:     chunk = chunk->next();
coleenp@4037:   }
coleenp@4037:   return result;
coleenp@4037: }
coleenp@4037: 
coleenp@4037: size_t SpaceManager::sum_capacity_in_chunks_in_use() const {
jmasa@5015:   // For CMS use "allocated_chunks_words()" which does not need the
jmasa@5015:   // Metaspace lock.  For the other collectors sum over the
jmasa@5015:   // lists.  Use both methods as a check that "allocated_chunks_words()"
jmasa@5015:   // is correct.  That is, sum_capacity_in_chunks() is too expensive
jmasa@5015:   // to use in the product and allocated_chunks_words() should be used
jmasa@5015:   // but allow for  checking that allocated_chunks_words() returns the same
jmasa@5015:   // value as sum_capacity_in_chunks_in_use() which is the definitive
jmasa@5015:   // answer.
jmasa@5015:   if (UseConcMarkSweepGC) {
jmasa@5015:     return allocated_chunks_words();
jmasa@5015:   } else {
jmasa@5015:     MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
jmasa@5015:     size_t sum = 0;
jmasa@5015:     for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
jmasa@5015:       Metachunk* chunk = chunks_in_use(i);
jmasa@5015:       while (chunk != NULL) {
stefank@5941:         sum += chunk->word_size();
jmasa@5015:         chunk = chunk->next();
jmasa@5015:       }
coleenp@4037:     }
jmasa@5015:   return sum;
coleenp@4037:   }
coleenp@4037: }
coleenp@4037: 
coleenp@4037: size_t SpaceManager::sum_count_in_chunks_in_use() {
coleenp@4037:   size_t count = 0;
jmasa@4382:   for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@4037:     count = count + sum_count_in_chunks_in_use(i);
coleenp@4037:   }
jmasa@4196: 
coleenp@4037:   return count;
coleenp@4037: }
coleenp@4037: 
coleenp@4037: size_t SpaceManager::sum_count_in_chunks_in_use(ChunkIndex i) {
coleenp@4037:   size_t count = 0;
coleenp@4037:   Metachunk* chunk = chunks_in_use(i);
coleenp@4037:   while (chunk != NULL) {
coleenp@4037:     count++;
coleenp@4037:     chunk = chunk->next();
coleenp@4037:   }
coleenp@4037:   return count;
coleenp@4037: }
coleenp@4037: 
coleenp@4037: 
coleenp@4037: size_t SpaceManager::sum_used_in_chunks_in_use() const {
coleenp@4037:   MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@4037:   size_t used = 0;
jmasa@4382:   for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@4037:     Metachunk* chunk = chunks_in_use(i);
coleenp@4037:     while (chunk != NULL) {
coleenp@4037:       used += chunk->used_word_size();
coleenp@4037:       chunk = chunk->next();
coleenp@4037:     }
coleenp@4037:   }
coleenp@4037:   return used;
coleenp@4037: }
coleenp@4037: 
coleenp@4037: void SpaceManager::locked_print_chunks_in_use_on(outputStream* st) const {
coleenp@4037: 
jmasa@4382:   for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
jmasa@4382:     Metachunk* chunk = chunks_in_use(i);
jmasa@4382:     st->print("SpaceManager: %s " PTR_FORMAT,
jmasa@4382:                  chunk_size_name(i), chunk);
jmasa@4382:     if (chunk != NULL) {
jmasa@4382:       st->print_cr(" free " SIZE_FORMAT,
jmasa@4382:                    chunk->free_word_size());
jmasa@4382:     } else {
drchase@6680:       st->cr();
jmasa@4382:     }
jmasa@4382:   }
coleenp@4037: 
stefank@5771:   chunk_manager()->locked_print_free_chunks(st);
stefank@5771:   chunk_manager()->locked_print_sum_free_chunks(st);
coleenp@4037: }
coleenp@4037: 
coleenp@4037: size_t SpaceManager::calc_chunk_size(size_t word_size) {
coleenp@4037: 
coleenp@4037:   // Decide between a small chunk and a medium chunk.  Up to
jwilhelm@7867:   // _small_chunk_limit small chunks can be allocated but
jwilhelm@7867:   // once a medium chunk has been allocated, no more small
jwilhelm@7867:   // chunks will be allocated.
coleenp@4037:   size_t chunk_word_size;
coleenp@4037:   if (chunks_in_use(MediumIndex) == NULL &&
coleenp@5337:       sum_count_in_chunks_in_use(SmallIndex) < _small_chunk_limit) {
jmasa@4382:     chunk_word_size = (size_t) small_chunk_size();
jmasa@4382:     if (word_size + Metachunk::overhead() > small_chunk_size()) {
jmasa@4382:       chunk_word_size = medium_chunk_size();
coleenp@4037:     }
coleenp@4037:   } else {
jmasa@4382:     chunk_word_size = medium_chunk_size();
coleenp@4037:   }
coleenp@4037: 
mgerdin@6004:   // Might still need a humongous chunk.  Enforce
mgerdin@6004:   // humongous allocations sizes to be aligned up to
mgerdin@6004:   // the smallest chunk size.
jmasa@4382:   size_t if_humongous_sized_chunk =
jmasa@4382:     align_size_up(word_size + Metachunk::overhead(),
mgerdin@6004:                   smallest_chunk_size());
coleenp@4037:   chunk_word_size =
jmasa@4382:     MAX2((size_t) chunk_word_size, if_humongous_sized_chunk);
jmasa@4382: 
jmasa@4382:   assert(!SpaceManager::is_humongous(word_size) ||
jmasa@4382:          chunk_word_size == if_humongous_sized_chunk,
jmasa@4382:          err_msg("Size calculation is wrong, word_size " SIZE_FORMAT
jmasa@4382:                  " chunk_word_size " SIZE_FORMAT,
jmasa@4382:                  word_size, chunk_word_size));
coleenp@4037:   if (TraceMetadataHumongousAllocation &&
coleenp@4037:       SpaceManager::is_humongous(word_size)) {
coleenp@4037:     gclog_or_tty->print_cr("Metadata humongous allocation:");
coleenp@4037:     gclog_or_tty->print_cr("  word_size " PTR_FORMAT, word_size);
coleenp@4037:     gclog_or_tty->print_cr("  chunk_word_size " PTR_FORMAT,
coleenp@4037:                            chunk_word_size);
jmasa@4196:     gclog_or_tty->print_cr("    chunk overhead " PTR_FORMAT,
coleenp@4037:                            Metachunk::overhead());
coleenp@4037:   }
coleenp@4037:   return chunk_word_size;
coleenp@4037: }
coleenp@4037: 
stefank@5864: void SpaceManager::track_metaspace_memory_usage() {
stefank@5864:   if (is_init_completed()) {
stefank@5864:     if (is_class()) {
stefank@5864:       MemoryService::track_compressed_class_memory_usage();
stefank@5864:     }
stefank@5864:     MemoryService::track_metaspace_memory_usage();
stefank@5864:   }
stefank@5864: }
stefank@5864: 
jmasa@4196: MetaWord* SpaceManager::grow_and_allocate(size_t word_size) {
coleenp@4037:   assert(vs_list()->current_virtual_space() != NULL,
coleenp@4037:          "Should have been set");
coleenp@4037:   assert(current_chunk() == NULL ||
coleenp@4037:          current_chunk()->allocate(word_size) == NULL,
coleenp@4037:          "Don't need to expand");
coleenp@4037:   MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
coleenp@4037: 
coleenp@4037:   if (TraceMetadataChunkAllocation && Verbose) {
jmasa@4382:     size_t words_left = 0;
jmasa@4382:     size_t words_used = 0;
jmasa@4382:     if (current_chunk() != NULL) {
jmasa@4382:       words_left = current_chunk()->free_word_size();
jmasa@4382:       words_used = current_chunk()->used_word_size();
jmasa@4382:     }
coleenp@4037:     gclog_or_tty->print_cr("SpaceManager::grow_and_allocate for " SIZE_FORMAT
jmasa@4382:                            " words " SIZE_FORMAT " words used " SIZE_FORMAT
jmasa@4382:                            " words left",
jmasa@4382:                             word_size, words_used, words_left);
coleenp@4037:   }
coleenp@4037: 
jwilhelm@7867:   // Get another chunk out of the virtual space
coleenp@4037:   size_t grow_chunks_by_words = calc_chunk_size(word_size);
jmasa@4382:   Metachunk* next = get_new_chunk(word_size, grow_chunks_by_words);
coleenp@4037: 
stefank@5863:   MetaWord* mem = NULL;
stefank@5863: 
coleenp@4037:   // If a chunk was available, add it to the in-use chunk list
coleenp@4037:   // and do an allocation from it.
coleenp@4037:   if (next != NULL) {
coleenp@4037:     // Add to this manager's list of chunks in use.
coleenp@4037:     add_chunk(next, false);
stefank@5863:     mem = next->allocate(word_size);
coleenp@4037:   }
stefank@5863: 
stefank@5864:   // Track metaspace memory usage statistic.
stefank@5864:   track_metaspace_memory_usage();
stefank@5864: 
stefank@5863:   return mem;
coleenp@4037: }
coleenp@4037: 
coleenp@4037: void SpaceManager::print_on(outputStream* st) const {
coleenp@4037: 
jmasa@4382:   for (ChunkIndex i = ZeroIndex;
jmasa@4196:        i < NumberOfInUseLists ;
coleenp@4037:        i = next_chunk_index(i) ) {
coleenp@4037:     st->print_cr("  chunks_in_use " PTR_FORMAT " chunk size " PTR_FORMAT,
coleenp@4037:                  chunks_in_use(i),
coleenp@4037:                  chunks_in_use(i) == NULL ? 0 : chunks_in_use(i)->word_size());
coleenp@4037:   }
coleenp@4037:   st->print_cr("    waste:  Small " SIZE_FORMAT " Medium " SIZE_FORMAT
coleenp@4037:                " Humongous " SIZE_FORMAT,
coleenp@4037:                sum_waste_in_chunks_in_use(SmallIndex),
coleenp@4037:                sum_waste_in_chunks_in_use(MediumIndex),
coleenp@4037:                sum_waste_in_chunks_in_use(HumongousIndex));
jmasa@4196:   // block free lists
jmasa@4196:   if (block_freelists() != NULL) {
jmasa@4196:     st->print_cr("total in block free lists " SIZE_FORMAT,
jmasa@4196:       block_freelists()->total_size());
jmasa@4196:   }
coleenp@4037: }
coleenp@4037: 
jmasa@5162: SpaceManager::SpaceManager(Metaspace::MetadataType mdtype,
stefank@5771:                            Mutex* lock) :
jmasa@5162:   _mdtype(mdtype),
jmasa@5015:   _allocated_blocks_words(0),
jmasa@5015:   _allocated_chunks_words(0),
jmasa@5015:   _allocated_chunks_count(0),
jmasa@4382:   _lock(lock)
jmasa@4382: {
jmasa@4382:   initialize();
jmasa@4382: }
jmasa@4382: 
jmasa@5015: void SpaceManager::inc_size_metrics(size_t words) {
jmasa@5015:   assert_lock_strong(SpaceManager::expand_lock());
jmasa@5015:   // Total of allocated Metachunks and allocated Metachunks count
jmasa@5015:   // for each SpaceManager
jmasa@5015:   _allocated_chunks_words = _allocated_chunks_words + words;
jmasa@5015:   _allocated_chunks_count++;
jmasa@5015:   // Global total of capacity in allocated Metachunks
jmasa@5162:   MetaspaceAux::inc_capacity(mdtype(), words);
jmasa@5015:   // Global total of allocated Metablocks.
jmasa@5015:   // used_words_slow() includes the overhead in each
jmasa@5015:   // Metachunk so include it in the used when the
jmasa@5015:   // Metachunk is first added (so only added once per
jmasa@5015:   // Metachunk).
jmasa@5162:   MetaspaceAux::inc_used(mdtype(), Metachunk::overhead());
jmasa@5015: }
jmasa@5015: 
jmasa@5015: void SpaceManager::inc_used_metrics(size_t words) {
jmasa@5015:   // Add to the per SpaceManager total
jmasa@5015:   Atomic::add_ptr(words, &_allocated_blocks_words);
jmasa@5015:   // Add to the global total
jmasa@5162:   MetaspaceAux::inc_used(mdtype(), words);
jmasa@5015: }
jmasa@5015: 
jmasa@5015: void SpaceManager::dec_total_from_size_metrics() {
jmasa@5162:   MetaspaceAux::dec_capacity(mdtype(), allocated_chunks_words());
jmasa@5162:   MetaspaceAux::dec_used(mdtype(), allocated_blocks_words());
jmasa@5015:   // Also deduct the overhead per Metachunk
jmasa@5162:   MetaspaceAux::dec_used(mdtype(), allocated_chunks_count() * Metachunk::overhead());
jmasa@5015: }
jmasa@5015: 
jmasa@4382: void SpaceManager::initialize() {
coleenp@4037:   Metadebug::init_allocation_fail_alot_count();
jmasa@4382:   for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@4037:     _chunks_in_use[i] = NULL;
coleenp@4037:   }
coleenp@4037:   _current_chunk = NULL;
coleenp@4037:   if (TraceMetadataChunkAllocation && Verbose) {
coleenp@4037:     gclog_or_tty->print_cr("SpaceManager(): " PTR_FORMAT, this);
coleenp@4037:   }
coleenp@4037: }
coleenp@4037: 
jmasa@4932: void ChunkManager::return_chunks(ChunkIndex index, Metachunk* chunks) {
jmasa@4932:   if (chunks == NULL) {
jmasa@4932:     return;
jmasa@4932:   }
jmasa@4932:   ChunkList* list = free_chunks(index);
jmasa@4932:   assert(list->size() == chunks->word_size(), "Mismatch in chunk sizes");
jmasa@4932:   assert_lock_strong(SpaceManager::expand_lock());
jmasa@4932:   Metachunk* cur = chunks;
jmasa@4932: 
jmasa@5007:   // This returns chunks one at a time.  If a new
jmasa@4932:   // class List can be created that is a base class
jmasa@4932:   // of FreeList then something like FreeList::prepend()
jmasa@4932:   // can be used in place of this loop
jmasa@4932:   while (cur != NULL) {
jmasa@5007:     assert(cur->container() != NULL, "Container should have been set");
jmasa@5007:     cur->container()->dec_container_count();
jmasa@4932:     // Capture the next link before it is changed
jmasa@4932:     // by the call to return_chunk_at_head();
jmasa@4932:     Metachunk* next = cur->next();
stefank@5941:     DEBUG_ONLY(cur->set_is_tagged_free(true);)
jmasa@4932:     list->return_chunk_at_head(cur);
jmasa@4932:     cur = next;
jmasa@4932:   }
jmasa@4932: }
jmasa@4932: 
coleenp@4037: SpaceManager::~SpaceManager() {
mgerdin@4784:   // This call this->_lock which can't be done while holding expand_lock()
jmasa@5015:   assert(sum_capacity_in_chunks_in_use() == allocated_chunks_words(),
jmasa@5015:     err_msg("sum_capacity_in_chunks_in_use() " SIZE_FORMAT
jmasa@5015:             " allocated_chunks_words() " SIZE_FORMAT,
jmasa@5015:             sum_capacity_in_chunks_in_use(), allocated_chunks_words()));
mgerdin@4784: 
coleenp@4037:   MutexLockerEx fcl(SpaceManager::expand_lock(),
coleenp@4037:                     Mutex::_no_safepoint_check_flag);
coleenp@4037: 
stefank@5771:   chunk_manager()->slow_locked_verify();
coleenp@4037: 
jmasa@5015:   dec_total_from_size_metrics();
jmasa@5015: 
coleenp@4037:   if (TraceMetadataChunkAllocation && Verbose) {
coleenp@4037:     gclog_or_tty->print_cr("~SpaceManager(): " PTR_FORMAT, this);
coleenp@4037:     locked_print_chunks_in_use_on(gclog_or_tty);
coleenp@4037:   }
coleenp@4037: 
jmasa@5007:   // Do not mangle freed Metachunks.  The chunk size inside Metachunks
jmasa@5007:   // is during the freeing of a VirtualSpaceNodes.
coleenp@4304: 
coleenp@4037:   // Have to update before the chunks_in_use lists are emptied
coleenp@4037:   // below.
stefank@5771:   chunk_manager()->inc_free_chunks_total(allocated_chunks_words(),
stefank@5771:                                          sum_count_in_chunks_in_use());
coleenp@4037: 
coleenp@4037:   // Add all the chunks in use by this space manager
coleenp@4037:   // to the global list of free chunks.
coleenp@4037: 
jmasa@4382:   // Follow each list of chunks-in-use and add them to the
jmasa@4382:   // free lists.  Each list is NULL terminated.
jmasa@4382: 
jmasa@4382:   for (ChunkIndex i = ZeroIndex; i < HumongousIndex; i = next_chunk_index(i)) {
jmasa@4382:     if (TraceMetadataChunkAllocation && Verbose) {
jmasa@4382:       gclog_or_tty->print_cr("returned %d %s chunks to freelist",
jmasa@4382:                              sum_count_in_chunks_in_use(i),
jmasa@4382:                              chunk_size_name(i));
jmasa@4382:     }
jmasa@4382:     Metachunk* chunks = chunks_in_use(i);
stefank@5771:     chunk_manager()->return_chunks(i, chunks);
jmasa@4382:     set_chunks_in_use(i, NULL);
jmasa@4382:     if (TraceMetadataChunkAllocation && Verbose) {
jmasa@4382:       gclog_or_tty->print_cr("updated freelist count %d %s",
stefank@5771:                              chunk_manager()->free_chunks(i)->count(),
jmasa@4382:                              chunk_size_name(i));
jmasa@4382:     }
jmasa@4382:     assert(i != HumongousIndex, "Humongous chunks are handled explicitly later");
coleenp@4037:   }
coleenp@4037: 
jmasa@4382:   // The medium chunk case may be optimized by passing the head and
jmasa@4382:   // tail of the medium chunk list to add_at_head().  The tail is often
jmasa@4382:   // the current chunk but there are probably exceptions.
jmasa@4382: 
coleenp@4037:   // Humongous chunks
jmasa@4382:   if (TraceMetadataChunkAllocation && Verbose) {
jmasa@4382:     gclog_or_tty->print_cr("returned %d %s humongous chunks to dictionary",
jmasa@4382:                             sum_count_in_chunks_in_use(HumongousIndex),
jmasa@4382:                             chunk_size_name(HumongousIndex));
jmasa@4382:     gclog_or_tty->print("Humongous chunk dictionary: ");
jmasa@4382:   }
coleenp@4037:   // Humongous chunks are never the current chunk.
coleenp@4037:   Metachunk* humongous_chunks = chunks_in_use(HumongousIndex);
coleenp@4037: 
jmasa@4196:   while (humongous_chunks != NULL) {
jmasa@4196: #ifdef ASSERT
stefank@5941:     humongous_chunks->set_is_tagged_free(true);
jmasa@4196: #endif
jmasa@4382:     if (TraceMetadataChunkAllocation && Verbose) {
jmasa@4382:       gclog_or_tty->print(PTR_FORMAT " (" SIZE_FORMAT ") ",
jmasa@4382:                           humongous_chunks,
jmasa@4382:                           humongous_chunks->word_size());
jmasa@4382:     }
jmasa@4382:     assert(humongous_chunks->word_size() == (size_t)
jmasa@4382:            align_size_up(humongous_chunks->word_size(),
mgerdin@6004:                              smallest_chunk_size()),
jmasa@4382:            err_msg("Humongous chunk size is wrong: word size " SIZE_FORMAT
mikael@4548:                    " granularity %d",
mgerdin@6004:                    humongous_chunks->word_size(), smallest_chunk_size()));
jmasa@4196:     Metachunk* next_humongous_chunks = humongous_chunks->next();
jmasa@5007:     humongous_chunks->container()->dec_container_count();
stefank@5771:     chunk_manager()->humongous_dictionary()->return_chunk(humongous_chunks);
jmasa@4196:     humongous_chunks = next_humongous_chunks;
coleenp@4037:   }
jmasa@4382:   if (TraceMetadataChunkAllocation && Verbose) {
drchase@6680:     gclog_or_tty->cr();
jmasa@4382:     gclog_or_tty->print_cr("updated dictionary count %d %s",
stefank@5771:                      chunk_manager()->humongous_dictionary()->total_count(),
jmasa@4382:                      chunk_size_name(HumongousIndex));
jmasa@4382:   }
stefank@5771:   chunk_manager()->slow_locked_verify();
coleenp@4037: }
coleenp@4037: 
jmasa@4382: const char* SpaceManager::chunk_size_name(ChunkIndex index) const {
jmasa@4382:   switch (index) {
jmasa@4382:     case SpecializedIndex:
jmasa@4382:       return "Specialized";
jmasa@4382:     case SmallIndex:
jmasa@4382:       return "Small";
jmasa@4382:     case MediumIndex:
jmasa@4382:       return "Medium";
jmasa@4382:     case HumongousIndex:
jmasa@4382:       return "Humongous";
jmasa@4382:     default:
jmasa@4382:       return NULL;
jmasa@4382:   }
jmasa@4382: }
jmasa@4382: 
jmasa@4382: ChunkIndex ChunkManager::list_index(size_t size) {
jmasa@4382:   switch (size) {
jmasa@4382:     case SpecializedChunk:
jmasa@4382:       assert(SpecializedChunk == ClassSpecializedChunk,
jmasa@4382:              "Need branch for ClassSpecializedChunk");
jmasa@4382:       return SpecializedIndex;
jmasa@4382:     case SmallChunk:
jmasa@4382:     case ClassSmallChunk:
jmasa@4382:       return SmallIndex;
jmasa@4382:     case MediumChunk:
jmasa@4382:     case ClassMediumChunk:
jmasa@4382:       return MediumIndex;
jmasa@4382:     default:
jmasa@4383:       assert(size > MediumChunk || size > ClassMediumChunk,
jmasa@4382:              "Not a humongous chunk");
jmasa@4382:       return HumongousIndex;
jmasa@4382:   }
jmasa@4382: }
jmasa@4382: 
jmasa@4196: void SpaceManager::deallocate(MetaWord* p, size_t word_size) {
coleenp@4037:   assert_lock_strong(_lock);
fparain@5452:   size_t raw_word_size = get_raw_word_size(word_size);
goetz@6337:   size_t min_size = TreeChunk<Metablock, FreeList<Metablock> >::min_size();
fparain@5452:   assert(raw_word_size >= min_size,
hseigel@5528:          err_msg("Should not deallocate dark matter " SIZE_FORMAT "<" SIZE_FORMAT, word_size, min_size));
fparain@5452:   block_freelists()->return_block(p, raw_word_size);
coleenp@4037: }
coleenp@4037: 
coleenp@4037: // Adds a chunk to the list of chunks in use.
coleenp@4037: void SpaceManager::add_chunk(Metachunk* new_chunk, bool make_current) {
coleenp@4037: 
coleenp@4037:   assert(new_chunk != NULL, "Should not be NULL");
coleenp@4037:   assert(new_chunk->next() == NULL, "Should not be on a list");
coleenp@4037: 
coleenp@4037:   new_chunk->reset_empty();
coleenp@4037: 
coleenp@4037:   // Find the correct list and and set the current
coleenp@4037:   // chunk for that list.
jmasa@4382:   ChunkIndex index = ChunkManager::list_index(new_chunk->word_size());
jmasa@4382: 
jmasa@4382:   if (index != HumongousIndex) {
mgerdin@5699:     retire_current_chunk();
coleenp@4037:     set_current_chunk(new_chunk);
jmasa@4382:     new_chunk->set_next(chunks_in_use(index));
jmasa@4382:     set_chunks_in_use(index, new_chunk);
jmasa@4382:   } else {
coleenp@4037:     // For null class loader data and DumpSharedSpaces, the first chunk isn't
coleenp@4037:     // small, so small will be null.  Link this first chunk as the current
coleenp@4037:     // chunk.
coleenp@4037:     if (make_current) {
coleenp@4037:       // Set as the current chunk but otherwise treat as a humongous chunk.
coleenp@4037:       set_current_chunk(new_chunk);
coleenp@4037:     }
coleenp@4037:     // Link at head.  The _current_chunk only points to a humongous chunk for
coleenp@4037:     // the null class loader metaspace (class and data virtual space managers)
coleenp@4037:     // any humongous chunks so will not point to the tail
coleenp@4037:     // of the humongous chunks list.
coleenp@4037:     new_chunk->set_next(chunks_in_use(HumongousIndex));
coleenp@4037:     set_chunks_in_use(HumongousIndex, new_chunk);
coleenp@4037: 
jmasa@4383:     assert(new_chunk->word_size() > medium_chunk_size(), "List inconsistency");
coleenp@4037:   }
coleenp@4037: 
jmasa@5015:   // Add to the running sum of capacity
jmasa@5015:   inc_size_metrics(new_chunk->word_size());
jmasa@5015: 
coleenp@4037:   assert(new_chunk->is_empty(), "Not ready for reuse");
coleenp@4037:   if (TraceMetadataChunkAllocation && Verbose) {
coleenp@4037:     gclog_or_tty->print("SpaceManager::add_chunk: %d) ",
coleenp@4037:                         sum_count_in_chunks_in_use());
coleenp@4037:     new_chunk->print_on(gclog_or_tty);
stefank@5771:     chunk_manager()->locked_print_free_chunks(gclog_or_tty);
coleenp@4037:   }
coleenp@4037: }
coleenp@4037: 
mgerdin@5699: void SpaceManager::retire_current_chunk() {
mgerdin@5699:   if (current_chunk() != NULL) {
mgerdin@5699:     size_t remaining_words = current_chunk()->free_word_size();
goetz@6337:     if (remaining_words >= TreeChunk<Metablock, FreeList<Metablock> >::min_size()) {
mgerdin@5699:       block_freelists()->return_block(current_chunk()->allocate(remaining_words), remaining_words);
mgerdin@5699:       inc_used_metrics(remaining_words);
mgerdin@5699:     }
mgerdin@5699:   }
mgerdin@5699: }
mgerdin@5699: 
jmasa@4382: Metachunk* SpaceManager::get_new_chunk(size_t word_size,
jmasa@4382:                                        size_t grow_chunks_by_words) {
stefank@5771:   // Get a chunk from the chunk freelist
stefank@5771:   Metachunk* next = chunk_manager()->chunk_freelist_allocate(grow_chunks_by_words);
stefank@5771: 
stefank@5771:   if (next == NULL) {
stefank@5771:     next = vs_list()->get_new_chunk(word_size,
stefank@5771:                                     grow_chunks_by_words,
stefank@5771:                                     medium_chunk_bunch());
stefank@5771:   }
jmasa@4382: 
stefank@5707:   if (TraceMetadataHumongousAllocation && next != NULL &&
jmasa@4382:       SpaceManager::is_humongous(next->word_size())) {
stefank@5707:     gclog_or_tty->print_cr("  new humongous chunk word size "
stefank@5707:                            PTR_FORMAT, next->word_size());
jmasa@4382:   }
jmasa@4382: 
jmasa@4382:   return next;
jmasa@4382: }
jmasa@4382: 
coleenp@4037: MetaWord* SpaceManager::allocate(size_t word_size) {
coleenp@4037:   MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
coleenp@4037: 
iklam@5208:   size_t raw_word_size = get_raw_word_size(word_size);
coleenp@4037:   BlockFreelist* fl =  block_freelists();
jmasa@4196:   MetaWord* p = NULL;
coleenp@4037:   // Allocation from the dictionary is expensive in the sense that
coleenp@4037:   // the dictionary has to be searched for a size.  Don't allocate
coleenp@4037:   // from the dictionary until it starts to get fat.  Is this
coleenp@4037:   // a reasonable policy?  Maybe an skinny dictionary is fast enough
coleenp@4037:   // for allocations.  Do some profiling.  JJJ
jmasa@4196:   if (fl->total_size() > allocation_from_dictionary_limit) {
jmasa@4196:     p = fl->get_block(raw_word_size);
coleenp@4037:   }
jmasa@4196:   if (p == NULL) {
jmasa@4196:     p = allocate_work(raw_word_size);
coleenp@4037:   }
coleenp@4037: 
jmasa@4196:   return p;
coleenp@4037: }
coleenp@4037: 
coleenp@4037: // Returns the address of spaced allocated for "word_size".
coleenp@4037: // This methods does not know about blocks (Metablocks)
jmasa@4196: MetaWord* SpaceManager::allocate_work(size_t word_size) {
coleenp@4037:   assert_lock_strong(_lock);
coleenp@4037: #ifdef ASSERT
coleenp@4037:   if (Metadebug::test_metadata_failure()) {
coleenp@4037:     return NULL;
coleenp@4037:   }
coleenp@4037: #endif
coleenp@4037:   // Is there space in the current chunk?
jmasa@4196:   MetaWord* result = NULL;
coleenp@4037: 
coleenp@4037:   // For DumpSharedSpaces, only allocate out of the current chunk which is
coleenp@4037:   // never null because we gave it the size we wanted.   Caller reports out
coleenp@4037:   // of memory if this returns null.
coleenp@4037:   if (DumpSharedSpaces) {
coleenp@4037:     assert(current_chunk() != NULL, "should never happen");
jmasa@5015:     inc_used_metrics(word_size);
coleenp@4037:     return current_chunk()->allocate(word_size); // caller handles null result
coleenp@4037:   }
stefank@5863: 
coleenp@4037:   if (current_chunk() != NULL) {
coleenp@4037:     result = current_chunk()->allocate(word_size);
coleenp@4037:   }
coleenp@4037: 
coleenp@4037:   if (result == NULL) {
coleenp@4037:     result = grow_and_allocate(word_size);
coleenp@4037:   }
stefank@5863: 
stefank@5863:   if (result != NULL) {
jmasa@5015:     inc_used_metrics(word_size);
jmasa@4196:     assert(result != (MetaWord*) chunks_in_use(MediumIndex),
jmasa@4196:            "Head of the list is being allocated");
coleenp@4037:   }
coleenp@4037: 
coleenp@4037:   return result;
coleenp@4037: }
coleenp@4037: 
coleenp@4037: void SpaceManager::verify() {
coleenp@4037:   // If there are blocks in the dictionary, then
coleenp@4037:   // verfication of chunks does not work since
coleenp@4037:   // being in the dictionary alters a chunk.
jmasa@4196:   if (block_freelists()->total_size() == 0) {
jmasa@4382:     for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
coleenp@4037:       Metachunk* curr = chunks_in_use(i);
coleenp@4037:       while (curr != NULL) {
coleenp@4037:         curr->verify();
jmasa@4327:         verify_chunk_size(curr);
coleenp@4037:         curr = curr->next();
coleenp@4037:       }
coleenp@4037:     }
coleenp@4037:   }
coleenp@4037: }
coleenp@4037: 
jmasa@4327: void SpaceManager::verify_chunk_size(Metachunk* chunk) {
jmasa@4327:   assert(is_humongous(chunk->word_size()) ||
jmasa@4382:          chunk->word_size() == medium_chunk_size() ||
jmasa@4382:          chunk->word_size() == small_chunk_size() ||
jmasa@4382:          chunk->word_size() == specialized_chunk_size(),
jmasa@4327:          "Chunk size is wrong");
jmasa@4327:   return;
jmasa@4327: }
jmasa@4327: 
coleenp@4037: #ifdef ASSERT
jmasa@5015: void SpaceManager::verify_allocated_blocks_words() {
coleenp@4037:   // Verification is only guaranteed at a safepoint.
jmasa@5015:   assert(SafepointSynchronize::is_at_safepoint() || !Universe::is_fully_initialized(),
jmasa@5015:     "Verification can fail if the applications is running");
jmasa@5015:   assert(allocated_blocks_words() == sum_used_in_chunks_in_use(),
mikael@4548:     err_msg("allocation total is not consistent " SIZE_FORMAT
mikael@4548:             " vs " SIZE_FORMAT,
jmasa@5015:             allocated_blocks_words(), sum_used_in_chunks_in_use()));
coleenp@4037: }
coleenp@4037: 
coleenp@4037: #endif
coleenp@4037: 
coleenp@4037: void SpaceManager::dump(outputStream* const out) const {
coleenp@4037:   size_t curr_total = 0;
coleenp@4037:   size_t waste = 0;
coleenp@4037:   uint i = 0;
coleenp@4037:   size_t used = 0;
coleenp@4037:   size_t capacity = 0;
coleenp@4037: 
coleenp@4037:   // Add up statistics for all chunks in this SpaceManager.
jmasa@4382:   for (ChunkIndex index = ZeroIndex;
jmasa@4196:        index < NumberOfInUseLists;
coleenp@4037:        index = next_chunk_index(index)) {
coleenp@4037:     for (Metachunk* curr = chunks_in_use(index);
coleenp@4037:          curr != NULL;
coleenp@4037:          curr = curr->next()) {
coleenp@4037:       out->print("%d) ", i++);
coleenp@4037:       curr->print_on(out);
coleenp@4037:       curr_total += curr->word_size();
coleenp@4037:       used += curr->used_word_size();
stefank@5941:       capacity += curr->word_size();
coleenp@4037:       waste += curr->free_word_size() + curr->overhead();;
coleenp@4037:     }
coleenp@4037:   }
coleenp@4037: 
stefank@5707:   if (TraceMetadataChunkAllocation && Verbose) {
stefank@5707:     block_freelists()->print_on(out);
stefank@5707:   }
stefank@5707: 
jmasa@4382:   size_t free = current_chunk() == NULL ? 0 : current_chunk()->free_word_size();
coleenp@4037:   // Free space isn't wasted.
coleenp@4037:   waste -= free;
coleenp@4037: 
coleenp@4037:   out->print_cr("total of all chunks "  SIZE_FORMAT " used " SIZE_FORMAT
coleenp@4037:                 " free " SIZE_FORMAT " capacity " SIZE_FORMAT
coleenp@4037:                 " waste " SIZE_FORMAT, curr_total, used, free, capacity, waste);
coleenp@4037: }
coleenp@4037: 
coleenp@4304: #ifndef PRODUCT
coleenp@4037: void SpaceManager::mangle_freed_chunks() {
jmasa@4382:   for (ChunkIndex index = ZeroIndex;
jmasa@4196:        index < NumberOfInUseLists;
coleenp@4037:        index = next_chunk_index(index)) {
coleenp@4037:     for (Metachunk* curr = chunks_in_use(index);
coleenp@4037:          curr != NULL;
coleenp@4037:          curr = curr->next()) {
coleenp@4037:       curr->mangle();
coleenp@4037:     }
coleenp@4037:   }
coleenp@4037: }
coleenp@4304: #endif // PRODUCT
coleenp@4037: 
coleenp@4037: // MetaspaceAux
coleenp@4037: 
jmasa@5015: 
ehelin@6609: size_t MetaspaceAux::_capacity_words[] = {0, 0};
ehelin@6609: size_t MetaspaceAux::_used_words[] = {0, 0};
jmasa@5015: 
ehelin@5531: size_t MetaspaceAux::free_bytes(Metaspace::MetadataType mdtype) {
ehelin@5531:   VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
ehelin@5531:   return list == NULL ? 0 : list->free_bytes();
ehelin@5531: }
ehelin@5531: 
jmasa@5015: size_t MetaspaceAux::free_bytes() {
ehelin@5531:   return free_bytes(Metaspace::ClassType) + free_bytes(Metaspace::NonClassType);
jmasa@5015: }
jmasa@5015: 
jmasa@5162: void MetaspaceAux::dec_capacity(Metaspace::MetadataType mdtype, size_t words) {
jmasa@5015:   assert_lock_strong(SpaceManager::expand_lock());
ehelin@6609:   assert(words <= capacity_words(mdtype),
jmasa@5015:     err_msg("About to decrement below 0: words " SIZE_FORMAT
ehelin@6609:             " is greater than _capacity_words[%u] " SIZE_FORMAT,
ehelin@6609:             words, mdtype, capacity_words(mdtype)));
ehelin@6609:   _capacity_words[mdtype] -= words;
jmasa@5015: }
jmasa@5015: 
jmasa@5162: void MetaspaceAux::inc_capacity(Metaspace::MetadataType mdtype, size_t words) {
jmasa@5015:   assert_lock_strong(SpaceManager::expand_lock());
jmasa@5015:   // Needs to be atomic
ehelin@6609:   _capacity_words[mdtype] += words;
jmasa@5015: }
jmasa@5015: 
jmasa@5162: void MetaspaceAux::dec_used(Metaspace::MetadataType mdtype, size_t words) {
ehelin@6609:   assert(words <= used_words(mdtype),
jmasa@5015:     err_msg("About to decrement below 0: words " SIZE_FORMAT
ehelin@6609:             " is greater than _used_words[%u] " SIZE_FORMAT,
ehelin@6609:             words, mdtype, used_words(mdtype)));
jmasa@5015:   // For CMS deallocation of the Metaspaces occurs during the
jmasa@5015:   // sweep which is a concurrent phase.  Protection by the expand_lock()
jmasa@5015:   // is not enough since allocation is on a per Metaspace basis
jmasa@5015:   // and protected by the Metaspace lock.
jmasa@5015:   jlong minus_words = (jlong) - (jlong) words;
ehelin@6609:   Atomic::add_ptr(minus_words, &_used_words[mdtype]);
jmasa@5015: }
jmasa@5015: 
jmasa@5162: void MetaspaceAux::inc_used(Metaspace::MetadataType mdtype, size_t words) {
ehelin@6609:   // _used_words tracks allocations for
jmasa@5015:   // each piece of metadata.  Those allocations are
jmasa@5015:   // generally done concurrently by different application
jmasa@5015:   // threads so must be done atomically.
ehelin@6609:   Atomic::add_ptr(words, &_used_words[mdtype]);
jmasa@5015: }
jmasa@5015: 
jmasa@5015: size_t MetaspaceAux::used_bytes_slow(Metaspace::MetadataType mdtype) {
jmasa@4042:   size_t used = 0;
jmasa@4042:   ClassLoaderDataGraphMetaspaceIterator iter;
jmasa@4042:   while (iter.repeat()) {
jmasa@4042:     Metaspace* msp = iter.get_next();
jmasa@5015:     // Sum allocated_blocks_words for each metaspace
jmasa@4042:     if (msp != NULL) {
jmasa@5015:       used += msp->used_words_slow(mdtype);
jmasa@4042:     }
jmasa@4042:   }
jmasa@4042:   return used * BytesPerWord;
jmasa@4042: }
jmasa@4042: 
ehelin@5703: size_t MetaspaceAux::free_bytes_slow(Metaspace::MetadataType mdtype) {
coleenp@4037:   size_t free = 0;
coleenp@4037:   ClassLoaderDataGraphMetaspaceIterator iter;
coleenp@4037:   while (iter.repeat()) {
coleenp@4037:     Metaspace* msp = iter.get_next();
coleenp@4037:     if (msp != NULL) {
ehelin@5703:       free += msp->free_words_slow(mdtype);
coleenp@4037:     }
coleenp@4037:   }
coleenp@4037:   return free * BytesPerWord;
coleenp@4037: }
coleenp@4037: 
jmasa@5015: size_t MetaspaceAux::capacity_bytes_slow(Metaspace::MetadataType mdtype) {
hseigel@5528:   if ((mdtype == Metaspace::ClassType) && !Metaspace::using_class_space()) {
hseigel@5528:     return 0;
hseigel@5528:   }
jmasa@5015:   // Don't count the space in the freelists.  That space will be
jmasa@5015:   // added to the capacity calculation as needed.
jmasa@5015:   size_t capacity = 0;
coleenp@4037:   ClassLoaderDataGraphMetaspaceIterator iter;
coleenp@4037:   while (iter.repeat()) {
coleenp@4037:     Metaspace* msp = iter.get_next();
coleenp@4037:     if (msp != NULL) {
jmasa@5015:       capacity += msp->capacity_words_slow(mdtype);
coleenp@4037:     }
coleenp@4037:   }
coleenp@4037:   return capacity * BytesPerWord;
coleenp@4037: }
coleenp@4037: 
ehelin@5703: size_t MetaspaceAux::capacity_bytes_slow() {
ehelin@5703: #ifdef PRODUCT
ehelin@6609:   // Use capacity_bytes() in PRODUCT instead of this function.
ehelin@5703:   guarantee(false, "Should not call capacity_bytes_slow() in the PRODUCT");
ehelin@5703: #endif
ehelin@5703:   size_t class_capacity = capacity_bytes_slow(Metaspace::ClassType);
ehelin@5703:   size_t non_class_capacity = capacity_bytes_slow(Metaspace::NonClassType);
ehelin@6609:   assert(capacity_bytes() == class_capacity + non_class_capacity,
ehelin@6609:       err_msg("bad accounting: capacity_bytes() " SIZE_FORMAT
ehelin@5703:         " class_capacity + non_class_capacity " SIZE_FORMAT
ehelin@5703:         " class_capacity " SIZE_FORMAT " non_class_capacity " SIZE_FORMAT,
ehelin@6609:         capacity_bytes(), class_capacity + non_class_capacity,
ehelin@5703:         class_capacity, non_class_capacity));
ehelin@5703: 
ehelin@5703:   return class_capacity + non_class_capacity;
ehelin@5703: }
ehelin@5703: 
ehelin@5703: size_t MetaspaceAux::reserved_bytes(Metaspace::MetadataType mdtype) {
ehelin@5531:   VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
stefank@5704:   return list == NULL ? 0 : list->reserved_bytes();
stefank@5704: }
stefank@5704: 
stefank@5704: size_t MetaspaceAux::committed_bytes(Metaspace::MetadataType mdtype) {
stefank@5704:   VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
stefank@5704:   return list == NULL ? 0 : list->committed_bytes();
coleenp@4037: }
coleenp@4037: 
ehelin@5703: size_t MetaspaceAux::min_chunk_size_words() { return Metaspace::first_chunk_word_size(); }
ehelin@5703: 
ehelin@5703: size_t MetaspaceAux::free_chunks_total_words(Metaspace::MetadataType mdtype) {
stefank@5771:   ChunkManager* chunk_manager = Metaspace::get_chunk_manager(mdtype);
stefank@5771:   if (chunk_manager == NULL) {
hseigel@5528:     return 0;
hseigel@5528:   }
stefank@5771:   chunk_manager->slow_verify();
stefank@5771:   return chunk_manager->free_chunks_total_words();
coleenp@4037: }
coleenp@4037: 
ehelin@5703: size_t MetaspaceAux::free_chunks_total_bytes(Metaspace::MetadataType mdtype) {
ehelin@5703:   return free_chunks_total_words(mdtype) * BytesPerWord;
coleenp@4037: }
coleenp@4037: 
ehelin@5703: size_t MetaspaceAux::free_chunks_total_words() {
ehelin@5703:   return free_chunks_total_words(Metaspace::ClassType) +
ehelin@5703:          free_chunks_total_words(Metaspace::NonClassType);
jmasa@5015: }
jmasa@5015: 
ehelin@5703: size_t MetaspaceAux::free_chunks_total_bytes() {
ehelin@5703:   return free_chunks_total_words() * BytesPerWord;
jmasa@5015: }
jmasa@5015: 
ehelin@6420: bool MetaspaceAux::has_chunk_free_list(Metaspace::MetadataType mdtype) {
ehelin@6420:   return Metaspace::get_chunk_manager(mdtype) != NULL;
ehelin@6420: }
ehelin@6420: 
ehelin@6420: MetaspaceChunkFreeListSummary MetaspaceAux::chunk_free_list_summary(Metaspace::MetadataType mdtype) {
ehelin@6420:   if (!has_chunk_free_list(mdtype)) {
ehelin@6420:     return MetaspaceChunkFreeListSummary();
ehelin@6420:   }
ehelin@6420: 
ehelin@6420:   const ChunkManager* cm = Metaspace::get_chunk_manager(mdtype);
ehelin@6420:   return cm->chunk_free_list_summary();
ehelin@6420: }
ehelin@6420: 
coleenp@4037: void MetaspaceAux::print_metaspace_change(size_t prev_metadata_used) {
coleenp@4037:   gclog_or_tty->print(", [Metaspace:");
coleenp@4037:   if (PrintGCDetails && Verbose) {
coleenp@4037:     gclog_or_tty->print(" "  SIZE_FORMAT
coleenp@4037:                         "->" SIZE_FORMAT
jmasa@5015:                         "("  SIZE_FORMAT ")",
coleenp@4037:                         prev_metadata_used,
ehelin@6609:                         used_bytes(),
ehelin@5703:                         reserved_bytes());
coleenp@4037:   } else {
coleenp@4037:     gclog_or_tty->print(" "  SIZE_FORMAT "K"
coleenp@4037:                         "->" SIZE_FORMAT "K"
jmasa@5015:                         "("  SIZE_FORMAT "K)",
ehelin@5703:                         prev_metadata_used/K,
ehelin@6609:                         used_bytes()/K,
ehelin@5703:                         reserved_bytes()/K);
coleenp@4037:   }
coleenp@4037: 
coleenp@4037:   gclog_or_tty->print("]");
coleenp@4037: }
coleenp@4037: 
coleenp@4037: // This is printed when PrintGCDetails
coleenp@4037: void MetaspaceAux::print_on(outputStream* out) {
coleenp@4037:   Metaspace::MetadataType nct = Metaspace::NonClassType;
coleenp@4037: 
stefank@5863:   out->print_cr(" Metaspace       "
stefank@5863:                 "used "      SIZE_FORMAT "K, "
stefank@5863:                 "capacity "  SIZE_FORMAT "K, "
stefank@5863:                 "committed " SIZE_FORMAT "K, "
stefank@5863:                 "reserved "  SIZE_FORMAT "K",
ehelin@6609:                 used_bytes()/K,
ehelin@6609:                 capacity_bytes()/K,
stefank@5863:                 committed_bytes()/K,
stefank@5863:                 reserved_bytes()/K);
stefank@5863: 
hseigel@5528:   if (Metaspace::using_class_space()) {
hseigel@5528:     Metaspace::MetadataType ct = Metaspace::ClassType;
hseigel@5528:     out->print_cr("  class space    "
stefank@5863:                   "used "      SIZE_FORMAT "K, "
stefank@5863:                   "capacity "  SIZE_FORMAT "K, "
stefank@5863:                   "committed " SIZE_FORMAT "K, "
stefank@5863:                   "reserved "  SIZE_FORMAT "K",
ehelin@6609:                   used_bytes(ct)/K,
ehelin@6609:                   capacity_bytes(ct)/K,
stefank@5863:                   committed_bytes(ct)/K,
ehelin@5703:                   reserved_bytes(ct)/K);
hseigel@5528:   }
coleenp@4037: }
coleenp@4037: 
coleenp@4037: // Print information for class space and data space separately.
coleenp@4037: // This is almost the same as above.
coleenp@4037: void MetaspaceAux::print_on(outputStream* out, Metaspace::MetadataType mdtype) {
ehelin@5703:   size_t free_chunks_capacity_bytes = free_chunks_total_bytes(mdtype);
jmasa@5015:   size_t capacity_bytes = capacity_bytes_slow(mdtype);
jmasa@5015:   size_t used_bytes = used_bytes_slow(mdtype);
ehelin@5703:   size_t free_bytes = free_bytes_slow(mdtype);
coleenp@4037:   size_t used_and_free = used_bytes + free_bytes +
coleenp@4037:                            free_chunks_capacity_bytes;
coleenp@4037:   out->print_cr("  Chunk accounting: used in chunks " SIZE_FORMAT
coleenp@4037:              "K + unused in chunks " SIZE_FORMAT "K  + "
coleenp@4037:              " capacity in free chunks " SIZE_FORMAT "K = " SIZE_FORMAT
coleenp@4037:              "K  capacity in allocated chunks " SIZE_FORMAT "K",
coleenp@4037:              used_bytes / K,
coleenp@4037:              free_bytes / K,
coleenp@4037:              free_chunks_capacity_bytes / K,
coleenp@4037:              used_and_free / K,
coleenp@4037:              capacity_bytes / K);
mgerdin@4738:   // Accounting can only be correct if we got the values during a safepoint
mgerdin@4738:   assert(!SafepointSynchronize::is_at_safepoint() || used_and_free == capacity_bytes, "Accounting is wrong");
coleenp@4037: }
coleenp@4037: 
hseigel@5528: // Print total fragmentation for class metaspaces
hseigel@5528: void MetaspaceAux::print_class_waste(outputStream* out) {
hseigel@5528:   assert(Metaspace::using_class_space(), "class metaspace not used");
hseigel@5528:   size_t cls_specialized_waste = 0, cls_small_waste = 0, cls_medium_waste = 0;
hseigel@5528:   size_t cls_specialized_count = 0, cls_small_count = 0, cls_medium_count = 0, cls_humongous_count = 0;
hseigel@5528:   ClassLoaderDataGraphMetaspaceIterator iter;
hseigel@5528:   while (iter.repeat()) {
hseigel@5528:     Metaspace* msp = iter.get_next();
hseigel@5528:     if (msp != NULL) {
hseigel@5528:       cls_specialized_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SpecializedIndex);
hseigel@5528:       cls_specialized_count += msp->class_vsm()->sum_count_in_chunks_in_use(SpecializedIndex);
hseigel@5528:       cls_small_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SmallIndex);
hseigel@5528:       cls_small_count += msp->class_vsm()->sum_count_in_chunks_in_use(SmallIndex);
hseigel@5528:       cls_medium_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(MediumIndex);
hseigel@5528:       cls_medium_count += msp->class_vsm()->sum_count_in_chunks_in_use(MediumIndex);
hseigel@5528:       cls_humongous_count += msp->class_vsm()->sum_count_in_chunks_in_use(HumongousIndex);
hseigel@5528:     }
hseigel@5528:   }
hseigel@5528:   out->print_cr(" class: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", "
hseigel@5528:                 SIZE_FORMAT " small(s) " SIZE_FORMAT ", "
hseigel@5528:                 SIZE_FORMAT " medium(s) " SIZE_FORMAT ", "
hseigel@5528:                 "large count " SIZE_FORMAT,
hseigel@5528:                 cls_specialized_count, cls_specialized_waste,
hseigel@5528:                 cls_small_count, cls_small_waste,
hseigel@5528:                 cls_medium_count, cls_medium_waste, cls_humongous_count);
hseigel@5528: }
hseigel@5528: 
hseigel@5528: // Print total fragmentation for data and class metaspaces separately
coleenp@4037: void MetaspaceAux::print_waste(outputStream* out) {
coleenp@5337:   size_t specialized_waste = 0, small_waste = 0, medium_waste = 0;
coleenp@5337:   size_t specialized_count = 0, small_count = 0, medium_count = 0, humongous_count = 0;
coleenp@4037: 
coleenp@4037:   ClassLoaderDataGraphMetaspaceIterator iter;
coleenp@4037:   while (iter.repeat()) {
coleenp@4037:     Metaspace* msp = iter.get_next();
coleenp@4037:     if (msp != NULL) {
jmasa@4382:       specialized_waste += msp->vsm()->sum_waste_in_chunks_in_use(SpecializedIndex);
jmasa@4382:       specialized_count += msp->vsm()->sum_count_in_chunks_in_use(SpecializedIndex);
coleenp@4037:       small_waste += msp->vsm()->sum_waste_in_chunks_in_use(SmallIndex);
jmasa@4382:       small_count += msp->vsm()->sum_count_in_chunks_in_use(SmallIndex);
coleenp@4037:       medium_waste += msp->vsm()->sum_waste_in_chunks_in_use(MediumIndex);
jmasa@4382:       medium_count += msp->vsm()->sum_count_in_chunks_in_use(MediumIndex);
coleenp@5337:       humongous_count += msp->vsm()->sum_count_in_chunks_in_use(HumongousIndex);
coleenp@4037:     }
coleenp@4037:   }
coleenp@4037:   out->print_cr("Total fragmentation waste (words) doesn't count free space");
jmasa@4382:   out->print_cr("  data: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", "
jmasa@4382:                         SIZE_FORMAT " small(s) " SIZE_FORMAT ", "
coleenp@5337:                         SIZE_FORMAT " medium(s) " SIZE_FORMAT ", "
coleenp@5337:                         "large count " SIZE_FORMAT,
jmasa@4382:              specialized_count, specialized_waste, small_count,
coleenp@5337:              small_waste, medium_count, medium_waste, humongous_count);
hseigel@5528:   if (Metaspace::using_class_space()) {
hseigel@5528:     print_class_waste(out);
hseigel@5528:   }
coleenp@4037: }
coleenp@4037: 
coleenp@4037: // Dump global metaspace things from the end of ClassLoaderDataGraph
coleenp@4037: void MetaspaceAux::dump(outputStream* out) {
coleenp@4037:   out->print_cr("All Metaspace:");
coleenp@4037:   out->print("data space: "); print_on(out, Metaspace::NonClassType);
coleenp@4037:   out->print("class space: "); print_on(out, Metaspace::ClassType);
coleenp@4037:   print_waste(out);
coleenp@4037: }
coleenp@4037: 
mgerdin@4264: void MetaspaceAux::verify_free_chunks() {
stefank@5771:   Metaspace::chunk_manager_metadata()->verify();
hseigel@5528:   if (Metaspace::using_class_space()) {
stefank@5771:     Metaspace::chunk_manager_class()->verify();
hseigel@5528:   }
mgerdin@4264: }
mgerdin@4264: 
jmasa@5015: void MetaspaceAux::verify_capacity() {
jmasa@5015: #ifdef ASSERT
ehelin@6609:   size_t running_sum_capacity_bytes = capacity_bytes();
jmasa@5162:   // For purposes of the running sum of capacity, verify against capacity
jmasa@5015:   size_t capacity_in_use_bytes = capacity_bytes_slow();
jmasa@5015:   assert(running_sum_capacity_bytes == capacity_in_use_bytes,
ehelin@6609:     err_msg("capacity_words() * BytesPerWord " SIZE_FORMAT
jmasa@5015:             " capacity_bytes_slow()" SIZE_FORMAT,
jmasa@5015:             running_sum_capacity_bytes, capacity_in_use_bytes));
jmasa@5162:   for (Metaspace::MetadataType i = Metaspace::ClassType;
jmasa@5162:        i < Metaspace:: MetadataTypeCount;
jmasa@5162:        i = (Metaspace::MetadataType)(i + 1)) {
jmasa@5162:     size_t capacity_in_use_bytes = capacity_bytes_slow(i);
ehelin@6609:     assert(capacity_bytes(i) == capacity_in_use_bytes,
ehelin@6609:       err_msg("capacity_bytes(%u) " SIZE_FORMAT
jmasa@5162:               " capacity_bytes_slow(%u)" SIZE_FORMAT,
ehelin@6609:               i, capacity_bytes(i), i, capacity_in_use_bytes));
jmasa@5162:   }
jmasa@5015: #endif
jmasa@5015: }
jmasa@5015: 
jmasa@5015: void MetaspaceAux::verify_used() {
jmasa@5015: #ifdef ASSERT
ehelin@6609:   size_t running_sum_used_bytes = used_bytes();
jmasa@5162:   // For purposes of the running sum of used, verify against used
jmasa@5015:   size_t used_in_use_bytes = used_bytes_slow();
ehelin@6609:   assert(used_bytes() == used_in_use_bytes,
ehelin@6609:     err_msg("used_bytes() " SIZE_FORMAT
jmasa@5162:             " used_bytes_slow()" SIZE_FORMAT,
ehelin@6609:             used_bytes(), used_in_use_bytes));
jmasa@5162:   for (Metaspace::MetadataType i = Metaspace::ClassType;
jmasa@5162:        i < Metaspace:: MetadataTypeCount;
jmasa@5162:        i = (Metaspace::MetadataType)(i + 1)) {
jmasa@5162:     size_t used_in_use_bytes = used_bytes_slow(i);
ehelin@6609:     assert(used_bytes(i) == used_in_use_bytes,
ehelin@6609:       err_msg("used_bytes(%u) " SIZE_FORMAT
jmasa@5162:               " used_bytes_slow(%u)" SIZE_FORMAT,
ehelin@6609:               i, used_bytes(i), i, used_in_use_bytes));
jmasa@5162:   }
jmasa@5015: #endif
jmasa@5015: }
jmasa@5015: 
jmasa@5015: void MetaspaceAux::verify_metrics() {
jmasa@5015:   verify_capacity();
jmasa@5015:   verify_used();
jmasa@5015: }
jmasa@5015: 
jmasa@5015: 
coleenp@4037: // Metaspace methods
coleenp@4037: 
coleenp@4037: size_t Metaspace::_first_chunk_word_size = 0;
jmasa@4382: size_t Metaspace::_first_class_chunk_word_size = 0;
jmasa@4382: 
stefank@5863: size_t Metaspace::_commit_alignment = 0;
stefank@5863: size_t Metaspace::_reserve_alignment = 0;
stefank@5863: 
jmasa@4382: Metaspace::Metaspace(Mutex* lock, MetaspaceType type) {
jmasa@4382:   initialize(lock, type);
coleenp@4037: }
coleenp@4037: 
coleenp@4037: Metaspace::~Metaspace() {
coleenp@4037:   delete _vsm;
hseigel@5528:   if (using_class_space()) {
hseigel@5528:     delete _class_vsm;
hseigel@5528:   }
coleenp@4037: }
coleenp@4037: 
coleenp@4037: VirtualSpaceList* Metaspace::_space_list = NULL;
coleenp@4037: VirtualSpaceList* Metaspace::_class_space_list = NULL;
coleenp@4037: 
stefank@5771: ChunkManager* Metaspace::_chunk_manager_metadata = NULL;
stefank@5771: ChunkManager* Metaspace::_chunk_manager_class = NULL;
stefank@5771: 
coleenp@4037: #define VIRTUALSPACEMULTIPLIER 2
coleenp@4037: 
hseigel@5528: #ifdef _LP64
coleenp@6029: static const uint64_t UnscaledClassSpaceMax = (uint64_t(max_juint) + 1);
coleenp@6029: 
hseigel@5528: void Metaspace::set_narrow_klass_base_and_shift(address metaspace_base, address cds_base) {
hseigel@5528:   // Figure out the narrow_klass_base and the narrow_klass_shift.  The
hseigel@5528:   // narrow_klass_base is the lower of the metaspace base and the cds base
hseigel@5528:   // (if cds is enabled).  The narrow_klass_shift depends on the distance
hseigel@5528:   // between the lower base and higher address.
hseigel@5528:   address lower_base;
hseigel@5528:   address higher_address;
iklam@7089: #if INCLUDE_CDS
hseigel@5528:   if (UseSharedSpaces) {
hseigel@5528:     higher_address = MAX2((address)(cds_base + FileMapInfo::shared_spaces_size()),
coleenp@6029:                           (address)(metaspace_base + compressed_class_space_size()));
hseigel@5528:     lower_base = MIN2(metaspace_base, cds_base);
iklam@7089:   } else
iklam@7089: #endif
iklam@7089:   {
coleenp@6029:     higher_address = metaspace_base + compressed_class_space_size();
hseigel@5528:     lower_base = metaspace_base;
coleenp@6029: 
coleenp@6029:     uint64_t klass_encoding_max = UnscaledClassSpaceMax << LogKlassAlignmentInBytes;
coleenp@6029:     // If compressed class space fits in lower 32G, we don't need a base.
coleenp@6029:     if (higher_address <= (address)klass_encoding_max) {
coleenp@6029:       lower_base = 0; // effectively lower base is zero.
coleenp@6029:     }
hseigel@5528:   }
coleenp@6029: 
hseigel@5528:   Universe::set_narrow_klass_base(lower_base);
coleenp@6029: 
coleenp@6062:   if ((uint64_t)(higher_address - lower_base) <= UnscaledClassSpaceMax) {
hseigel@5528:     Universe::set_narrow_klass_shift(0);
hseigel@5528:   } else {
hseigel@5528:     assert(!UseSharedSpaces, "Cannot shift with UseSharedSpaces");
hseigel@5528:     Universe::set_narrow_klass_shift(LogKlassAlignmentInBytes);
hseigel@5528:   }
hseigel@5528: }
hseigel@5528: 
iklam@7089: #if INCLUDE_CDS
hseigel@5528: // Return TRUE if the specified metaspace_base and cds_base are close enough
hseigel@5528: // to work with compressed klass pointers.
hseigel@5528: bool Metaspace::can_use_cds_with_metaspace_addr(char* metaspace_base, address cds_base) {
hseigel@5528:   assert(cds_base != 0 && UseSharedSpaces, "Only use with CDS");
ehelin@5694:   assert(UseCompressedClassPointers, "Only use with CompressedKlassPtrs");
hseigel@5528:   address lower_base = MIN2((address)metaspace_base, cds_base);
hseigel@5528:   address higher_address = MAX2((address)(cds_base + FileMapInfo::shared_spaces_size()),
coleenp@6029:                                 (address)(metaspace_base + compressed_class_space_size()));
coleenp@6062:   return ((uint64_t)(higher_address - lower_base) <= UnscaledClassSpaceMax);
hseigel@5528: }
iklam@7089: #endif
hseigel@5528: 
hseigel@5528: // Try to allocate the metaspace at the requested addr.
hseigel@5528: void Metaspace::allocate_metaspace_compressed_klass_ptrs(char* requested_addr, address cds_base) {
hseigel@5528:   assert(using_class_space(), "called improperly");
ehelin@5694:   assert(UseCompressedClassPointers, "Only use with CompressedKlassPtrs");
coleenp@6029:   assert(compressed_class_space_size() < KlassEncodingMetaspaceMax,
hseigel@5528:          "Metaspace size is too big");
coleenp@6029:   assert_is_ptr_aligned(requested_addr, _reserve_alignment);
coleenp@6029:   assert_is_ptr_aligned(cds_base, _reserve_alignment);
coleenp@6029:   assert_is_size_aligned(compressed_class_space_size(), _reserve_alignment);
stefank@5863: 
stefank@5863:   // Don't use large pages for the class space.
stefank@5863:   bool large_pages = false;
hseigel@5528: 
coleenp@6029:   ReservedSpace metaspace_rs = ReservedSpace(compressed_class_space_size(),
stefank@5863:                                              _reserve_alignment,
stefank@5863:                                              large_pages,
stefank@5863:                                              requested_addr, 0);
hseigel@5528:   if (!metaspace_rs.is_reserved()) {
iklam@7089: #if INCLUDE_CDS
hseigel@5528:     if (UseSharedSpaces) {
stefank@5863:       size_t increment = align_size_up(1*G, _reserve_alignment);
stefank@5863: 
hseigel@5528:       // Keep trying to allocate the metaspace, increasing the requested_addr
hseigel@5528:       // by 1GB each time, until we reach an address that will no longer allow
hseigel@5528:       // use of CDS with compressed klass pointers.
hseigel@5528:       char *addr = requested_addr;
stefank@5863:       while (!metaspace_rs.is_reserved() && (addr + increment > addr) &&
stefank@5863:              can_use_cds_with_metaspace_addr(addr + increment, cds_base)) {
stefank@5863:         addr = addr + increment;
coleenp@6029:         metaspace_rs = ReservedSpace(compressed_class_space_size(),
stefank@5863:                                      _reserve_alignment, large_pages, addr, 0);
hseigel@5528:       }
hseigel@5528:     }
iklam@7089: #endif
hseigel@5528:     // If no successful allocation then try to allocate the space anywhere.  If
hseigel@5528:     // that fails then OOM doom.  At this point we cannot try allocating the
ehelin@5694:     // metaspace as if UseCompressedClassPointers is off because too much
ehelin@5694:     // initialization has happened that depends on UseCompressedClassPointers.
ehelin@5694:     // So, UseCompressedClassPointers cannot be turned off at this point.
hseigel@5528:     if (!metaspace_rs.is_reserved()) {
coleenp@6029:       metaspace_rs = ReservedSpace(compressed_class_space_size(),
stefank@5863:                                    _reserve_alignment, large_pages);
hseigel@5528:       if (!metaspace_rs.is_reserved()) {
hseigel@5528:         vm_exit_during_initialization(err_msg("Could not allocate metaspace: %d bytes",
coleenp@6029:                                               compressed_class_space_size()));
hseigel@5528:       }
hseigel@5528:     }
hseigel@5528:   }
hseigel@5528: 
hseigel@5528:   // If we got here then the metaspace got allocated.
hseigel@5528:   MemTracker::record_virtual_memory_type((address)metaspace_rs.base(), mtClass);
hseigel@5528: 
iklam@7089: #if INCLUDE_CDS
hseigel@5528:   // Verify that we can use shared spaces.  Otherwise, turn off CDS.
hseigel@5528:   if (UseSharedSpaces && !can_use_cds_with_metaspace_addr(metaspace_rs.base(), cds_base)) {
hseigel@5528:     FileMapInfo::stop_sharing_and_unmap(
hseigel@5528:         "Could not allocate metaspace at a compatible address");
hseigel@5528:   }
iklam@7089: #endif
hseigel@5528:   set_narrow_klass_base_and_shift((address)metaspace_rs.base(),
hseigel@5528:                                   UseSharedSpaces ? (address)cds_base : 0);
hseigel@5528: 
hseigel@5528:   initialize_class_space(metaspace_rs);
hseigel@5528: 
hseigel@5528:   if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
hseigel@5528:     gclog_or_tty->print_cr("Narrow klass base: " PTR_FORMAT ", Narrow klass shift: " SIZE_FORMAT,
hseigel@5528:                             Universe::narrow_klass_base(), Universe::narrow_klass_shift());
coleenp@6029:     gclog_or_tty->print_cr("Compressed class space size: " SIZE_FORMAT " Address: " PTR_FORMAT " Req Addr: " PTR_FORMAT,
coleenp@6029:                            compressed_class_space_size(), metaspace_rs.base(), requested_addr);
hseigel@5528:   }
hseigel@5528: }
hseigel@5528: 
ehelin@5694: // For UseCompressedClassPointers the class space is reserved above the top of
hseigel@5528: // the Java heap.  The argument passed in is at the base of the compressed space.
hseigel@5528: void Metaspace::initialize_class_space(ReservedSpace rs) {
hseigel@5528:   // The reserved space size may be bigger because of alignment, esp with UseLargePages
ehelin@5694:   assert(rs.size() >= CompressedClassSpaceSize,
ehelin@5694:          err_msg(SIZE_FORMAT " != " UINTX_FORMAT, rs.size(), CompressedClassSpaceSize));
hseigel@5528:   assert(using_class_space(), "Must be using class space");
hseigel@5528:   _class_space_list = new VirtualSpaceList(rs);
stefank@5771:   _chunk_manager_class = new ChunkManager(SpecializedChunk, ClassSmallChunk, ClassMediumChunk);
stefank@5863: 
stefank@5863:   if (!_class_space_list->initialization_succeeded()) {
stefank@5863:     vm_exit_during_initialization("Failed to setup compressed class space virtual space list.");
stefank@5863:   }
hseigel@5528: }
hseigel@5528: 
hseigel@5528: #endif
hseigel@5528: 
stefank@5863: void Metaspace::ergo_initialize() {
stefank@5863:   if (DumpSharedSpaces) {
stefank@5863:     // Using large pages when dumping the shared archive is currently not implemented.
stefank@5863:     FLAG_SET_ERGO(bool, UseLargePagesInMetaspace, false);
stefank@5863:   }
stefank@5863: 
stefank@5863:   size_t page_size = os::vm_page_size();
stefank@5863:   if (UseLargePages && UseLargePagesInMetaspace) {
stefank@5863:     page_size = os::large_page_size();
stefank@5863:   }
stefank@5863: 
stefank@5863:   _commit_alignment  = page_size;
stefank@5863:   _reserve_alignment = MAX2(page_size, (size_t)os::vm_allocation_granularity());
stefank@5863: 
stefank@5863:   // Do not use FLAG_SET_ERGO to update MaxMetaspaceSize, since this will
stefank@5863:   // override if MaxMetaspaceSize was set on the command line or not.
stefank@5863:   // This information is needed later to conform to the specification of the
stefank@5863:   // java.lang.management.MemoryUsage API.
stefank@5863:   //
stefank@5863:   // Ideally, we would be able to set the default value of MaxMetaspaceSize in
stefank@5863:   // globals.hpp to the aligned value, but this is not possible, since the
stefank@5863:   // alignment depends on other flags being parsed.
jwilhelm@6083:   MaxMetaspaceSize = align_size_down_bounded(MaxMetaspaceSize, _reserve_alignment);
stefank@5863: 
stefank@5863:   if (MetaspaceSize > MaxMetaspaceSize) {
stefank@5863:     MetaspaceSize = MaxMetaspaceSize;
stefank@5863:   }
stefank@5863: 
jwilhelm@6083:   MetaspaceSize = align_size_down_bounded(MetaspaceSize, _commit_alignment);
stefank@5863: 
stefank@5863:   assert(MetaspaceSize <= MaxMetaspaceSize, "MetaspaceSize should be limited by MaxMetaspaceSize");
stefank@5863: 
stefank@5863:   if (MetaspaceSize < 256*K) {
stefank@5863:     vm_exit_during_initialization("Too small initial Metaspace size");
stefank@5863:   }
stefank@5863: 
jwilhelm@6083:   MinMetaspaceExpansion = align_size_down_bounded(MinMetaspaceExpansion, _commit_alignment);
jwilhelm@6083:   MaxMetaspaceExpansion = align_size_down_bounded(MaxMetaspaceExpansion, _commit_alignment);
jwilhelm@6083: 
jwilhelm@6083:   CompressedClassSpaceSize = align_size_down_bounded(CompressedClassSpaceSize, _reserve_alignment);
coleenp@6029:   set_compressed_class_space_size(CompressedClassSpaceSize);
stefank@5863: }
stefank@5863: 
coleenp@4037: void Metaspace::global_initialize() {
ehelin@6722:   MetaspaceGC::initialize();
ehelin@6722: 
coleenp@4037:   // Initialize the alignment for shared spaces.
minqi@7297:   int max_alignment = os::vm_allocation_granularity();
hseigel@5528:   size_t cds_total = 0;
hseigel@5528: 
coleenp@4037:   MetaspaceShared::set_max_alignment(max_alignment);
coleenp@4037: 
coleenp@4037:   if (DumpSharedSpaces) {
iklam@7089: #if INCLUDE_CDS
ccheung@7103:     MetaspaceShared::estimate_regions_size();
ccheung@7103: 
stefank@5863:     SharedReadOnlySize  = align_size_up(SharedReadOnlySize,  max_alignment);
coleenp@4037:     SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment);
stefank@5863:     SharedMiscDataSize  = align_size_up(SharedMiscDataSize,  max_alignment);
stefank@5863:     SharedMiscCodeSize  = align_size_up(SharedMiscCodeSize,  max_alignment);
coleenp@4037: 
ccheung@7300:     // the min_misc_code_size estimate is based on MetaspaceShared::generate_vtable_methods()
ccheung@7300:     uintx min_misc_code_size = align_size_up(
ccheung@7300:       (MetaspaceShared::num_virtuals * MetaspaceShared::vtbl_list_size) *
ccheung@7300:         (sizeof(void*) + MetaspaceShared::vtbl_method_size) + MetaspaceShared::vtbl_common_code_size,
ccheung@7300:           max_alignment);
ccheung@7300: 
ccheung@7300:     if (SharedMiscCodeSize < min_misc_code_size) {
ccheung@7300:       report_out_of_shared_space(SharedMiscCode);
ccheung@7300:     }
ccheung@7300: 
coleenp@4037:     // Initialize with the sum of the shared space sizes.  The read-only
coleenp@4037:     // and read write metaspace chunks will be allocated out of this and the
coleenp@4037:     // remainder is the misc code and data chunks.
hseigel@5528:     cds_total = FileMapInfo::shared_spaces_size();
stefank@5863:     cds_total = align_size_up(cds_total, _reserve_alignment);
hseigel@5528:     _space_list = new VirtualSpaceList(cds_total/wordSize);
stefank@5771:     _chunk_manager_metadata = new ChunkManager(SpecializedChunk, SmallChunk, MediumChunk);
hseigel@5528: 
stefank@5863:     if (!_space_list->initialization_succeeded()) {
stefank@5863:       vm_exit_during_initialization("Unable to dump shared archive.", NULL);
stefank@5863:     }
stefank@5863: 
hseigel@5528: #ifdef _LP64
coleenp@6029:     if (cds_total + compressed_class_space_size() > UnscaledClassSpaceMax) {
stefank@5863:       vm_exit_during_initialization("Unable to dump shared archive.",
stefank@5863:           err_msg("Size of archive (" SIZE_FORMAT ") + compressed class space ("
stefank@5863:                   SIZE_FORMAT ") == total (" SIZE_FORMAT ") is larger than compressed "
coleenp@6029:                   "klass limit: " SIZE_FORMAT, cds_total, compressed_class_space_size(),
coleenp@6029:                   cds_total + compressed_class_space_size(), UnscaledClassSpaceMax));
stefank@5863:     }
stefank@5863: 
hseigel@5528:     // Set the compressed klass pointer base so that decoding of these pointers works
hseigel@5528:     // properly when creating the shared archive.
ehelin@5694:     assert(UseCompressedOops && UseCompressedClassPointers,
ehelin@5694:       "UseCompressedOops and UseCompressedClassPointers must be set");
hseigel@5528:     Universe::set_narrow_klass_base((address)_space_list->current_virtual_space()->bottom());
hseigel@5528:     if (TraceMetavirtualspaceAllocation && Verbose) {
hseigel@5528:       gclog_or_tty->print_cr("Setting_narrow_klass_base to Address: " PTR_FORMAT,
hseigel@5528:                              _space_list->current_virtual_space()->bottom());
hseigel@5528:     }
hseigel@5528: 
hseigel@5528:     Universe::set_narrow_klass_shift(0);
iklam@7089: #endif // _LP64
iklam@7089: #endif // INCLUDE_CDS
coleenp@4037:   } else {
iklam@7089: #if INCLUDE_CDS
coleenp@4037:     // If using shared space, open the file that contains the shared space
coleenp@4037:     // and map in the memory before initializing the rest of metaspace (so
coleenp@4037:     // the addresses don't conflict)
hseigel@5528:     address cds_address = NULL;
coleenp@4037:     if (UseSharedSpaces) {
coleenp@4037:       FileMapInfo* mapinfo = new FileMapInfo();
coleenp@4037: 
coleenp@4037:       // Open the shared archive file, read and validate the header. If
coleenp@4037:       // initialization fails, shared spaces [UseSharedSpaces] are
coleenp@4037:       // disabled and the file is closed.
coleenp@4037:       // Map in spaces now also
coleenp@4037:       if (mapinfo->initialize() && MetaspaceShared::map_shared_spaces(mapinfo)) {
stefank@5863:         cds_total = FileMapInfo::shared_spaces_size();
stefank@5863:         cds_address = (address)mapinfo->region_base(0);
coleenp@4037:       } else {
coleenp@4037:         assert(!mapinfo->is_open() && !UseSharedSpaces,
coleenp@4037:                "archive file not closed or shared spaces not disabled.");
coleenp@4037:       }
coleenp@4037:     }
iklam@7089: #endif // INCLUDE_CDS
hseigel@5528: #ifdef _LP64
ehelin@5694:     // If UseCompressedClassPointers is set then allocate the metaspace area
hseigel@5528:     // above the heap and above the CDS area (if it exists).
hseigel@5528:     if (using_class_space()) {
hseigel@5528:       if (UseSharedSpaces) {
iklam@7089: #if INCLUDE_CDS
stefank@5863:         char* cds_end = (char*)(cds_address + cds_total);
stefank@5863:         cds_end = (char *)align_ptr_up(cds_end, _reserve_alignment);
stefank@5863:         allocate_metaspace_compressed_klass_ptrs(cds_end, cds_address);
iklam@7089: #endif
hseigel@5528:       } else {
coleenp@6029:         char* base = (char*)align_ptr_up(Universe::heap()->reserved_region().end(), _reserve_alignment);
coleenp@6029:         allocate_metaspace_compressed_klass_ptrs(base, 0);
hseigel@5528:       }
hseigel@5528:     }
iklam@7089: #endif // _LP64
hseigel@5528: 
jmasa@4382:     // Initialize these before initializing the VirtualSpaceList
coleenp@4037:     _first_chunk_word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord;
jmasa@4382:     _first_chunk_word_size = align_word_size_up(_first_chunk_word_size);
jmasa@4382:     // Make the first class chunk bigger than a medium chunk so it's not put
jmasa@4382:     // on the medium chunk list.   The next chunk will be small and progress
jmasa@4382:     // from there.  This size calculated by -version.
jmasa@4382:     _first_class_chunk_word_size = MIN2((size_t)MediumChunk*6,
ehelin@5694:                                        (CompressedClassSpaceSize/BytesPerWord)*2);
jmasa@4382:     _first_class_chunk_word_size = align_word_size_up(_first_class_chunk_word_size);
coleenp@4037:     // Arbitrarily set the initial virtual space to a multiple
coleenp@4037:     // of the boot class loader size.
stefank@5863:     size_t word_size = VIRTUALSPACEMULTIPLIER * _first_chunk_word_size;
stefank@5863:     word_size = align_size_up(word_size, Metaspace::reserve_alignment_words());
stefank@5863: 
coleenp@4037:     // Initialize the list of virtual spaces.
coleenp@4037:     _space_list = new VirtualSpaceList(word_size);
stefank@5771:     _chunk_manager_metadata = new ChunkManager(SpecializedChunk, SmallChunk, MediumChunk);
stefank@5863: 
stefank@5863:     if (!_space_list->initialization_succeeded()) {
stefank@5863:       vm_exit_during_initialization("Unable to setup metadata virtual space list.", NULL);
stefank@5863:     }
coleenp@4037:   }
stefank@5863: 
ehelin@6417:   _tracer = new MetaspaceTracer();
coleenp@4037: }
coleenp@4037: 
ehelin@6722: void Metaspace::post_initialize() {
ehelin@6722:   MetaspaceGC::post_initialize();
ehelin@6722: }
ehelin@6722: 
stefank@5771: Metachunk* Metaspace::get_initialization_chunk(MetadataType mdtype,
stefank@5771:                                                size_t chunk_word_size,
stefank@5771:                                                size_t chunk_bunch) {
stefank@5771:   // Get a chunk from the chunk freelist
stefank@5771:   Metachunk* chunk = get_chunk_manager(mdtype)->chunk_freelist_allocate(chunk_word_size);
stefank@5771:   if (chunk != NULL) {
stefank@5771:     return chunk;
stefank@5771:   }
stefank@5771: 
stefank@5863:   return get_space_list(mdtype)->get_new_chunk(chunk_word_size, chunk_word_size, chunk_bunch);
stefank@5771: }
stefank@5771: 
hseigel@5528: void Metaspace::initialize(Mutex* lock, MetaspaceType type) {
coleenp@4037: 
coleenp@4037:   assert(space_list() != NULL,
coleenp@4037:     "Metadata VirtualSpaceList has not been initialized");
stefank@5771:   assert(chunk_manager_metadata() != NULL,
stefank@5771:     "Metadata ChunkManager has not been initialized");
stefank@5771: 
stefank@5771:   _vsm = new SpaceManager(NonClassType, lock);
coleenp@4037:   if (_vsm == NULL) {
coleenp@4037:     return;
coleenp@4037:   }
jmasa@4382:   size_t word_size;
jmasa@4382:   size_t class_word_size;
hseigel@5528:   vsm()->get_initial_chunk_sizes(type, &word_size, &class_word_size);
hseigel@5528: 
hseigel@5528:   if (using_class_space()) {
stefank@5771:   assert(class_space_list() != NULL,
stefank@5771:     "Class VirtualSpaceList has not been initialized");
stefank@5771:   assert(chunk_manager_class() != NULL,
stefank@5771:     "Class ChunkManager has not been initialized");
hseigel@5528: 
hseigel@5528:     // Allocate SpaceManager for classes.
stefank@5771:     _class_vsm = new SpaceManager(ClassType, lock);
hseigel@5528:     if (_class_vsm == NULL) {
hseigel@5528:       return;
hseigel@5528:     }
coleenp@4037:   }
coleenp@4037: 
coleenp@4037:   MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
coleenp@4037: 
coleenp@4037:   // Allocate chunk for metadata objects
stefank@5771:   Metachunk* new_chunk = get_initialization_chunk(NonClassType,
stefank@5771:                                                   word_size,
stefank@5771:                                                   vsm()->medium_chunk_bunch());
coleenp@4037:   assert(!DumpSharedSpaces || new_chunk != NULL, "should have enough space for both chunks");
coleenp@4037:   if (new_chunk != NULL) {
coleenp@4037:     // Add to this manager's list of chunks in use and current_chunk().
coleenp@4037:     vsm()->add_chunk(new_chunk, true);
coleenp@4037:   }
coleenp@4037: 
coleenp@4037:   // Allocate chunk for class metadata objects
hseigel@5528:   if (using_class_space()) {
stefank@5771:     Metachunk* class_chunk = get_initialization_chunk(ClassType,
stefank@5771:                                                       class_word_size,
stefank@5771:                                                       class_vsm()->medium_chunk_bunch());
hseigel@5528:     if (class_chunk != NULL) {
hseigel@5528:       class_vsm()->add_chunk(class_chunk, true);
hseigel@5528:     }
coleenp@4037:   }
iklam@5208: 
iklam@5208:   _alloc_record_head = NULL;
iklam@5208:   _alloc_record_tail = NULL;
coleenp@4037: }
coleenp@4037: 
jmasa@4382: size_t Metaspace::align_word_size_up(size_t word_size) {
jmasa@4382:   size_t byte_size = word_size * wordSize;
jmasa@4382:   return ReservedSpace::allocation_align_size_up(byte_size) / wordSize;
jmasa@4382: }
jmasa@4382: 
coleenp@4037: MetaWord* Metaspace::allocate(size_t word_size, MetadataType mdtype) {
coleenp@4037:   // DumpSharedSpaces doesn't use class metadata area (yet)
ehelin@5694:   // Also, don't use class_vsm() unless UseCompressedClassPointers is true.
mgerdin@5808:   if (is_class_space_allocation(mdtype)) {
jmasa@4196:     return  class_vsm()->allocate(word_size);
coleenp@4037:   } else {
jmasa@4196:     return  vsm()->allocate(word_size);
coleenp@4037:   }
coleenp@4037: }
coleenp@4037: 
jmasa@4064: MetaWord* Metaspace::expand_and_allocate(size_t word_size, MetadataType mdtype) {
stefank@5863:   size_t delta_bytes = MetaspaceGC::delta_capacity_until_GC(word_size * BytesPerWord);
stefank@5863:   assert(delta_bytes > 0, "Must be");
stefank@5863: 
ehelin@7254:   size_t before = 0;
ehelin@7254:   size_t after = 0;
ehelin@7254:   MetaWord* res;
ehelin@7254:   bool incremented;
ehelin@7254: 
ehelin@7254:   // Each thread increments the HWM at most once. Even if the thread fails to increment
ehelin@7254:   // the HWM, an allocation is still attempted. This is because another thread must then
ehelin@7254:   // have incremented the HWM and therefore the allocation might still succeed.
ehelin@7254:   do {
ehelin@7254:     incremented = MetaspaceGC::inc_capacity_until_GC(delta_bytes, &after, &before);
ehelin@7254:     res = allocate(word_size, mdtype);
ehelin@7254:   } while (!incremented && res == NULL);
ehelin@7254: 
ehelin@7254:   if (incremented) {
ehelin@7254:     tracer()->report_gc_threshold(before, after,
ehelin@7254:                                   MetaspaceGCThresholdUpdater::ExpandAndAllocate);
ehelin@7254:     if (PrintGCDetails && Verbose) {
ehelin@7254:       gclog_or_tty->print_cr("Increase capacity to GC from " SIZE_FORMAT
ehelin@7254:           " to " SIZE_FORMAT, before, after);
ehelin@7254:     }
jmasa@4064:   }
jmasa@4196: 
ehelin@7254:   return res;
jmasa@4064: }
jmasa@4064: 
coleenp@4037: // Space allocated in the Metaspace.  This may
coleenp@4037: // be across several metadata virtual spaces.
coleenp@4037: char* Metaspace::bottom() const {
coleenp@4037:   assert(DumpSharedSpaces, "only useful and valid for dumping shared spaces");
coleenp@4037:   return (char*)vsm()->current_chunk()->bottom();
coleenp@4037: }
coleenp@4037: 
jmasa@5015: size_t Metaspace::used_words_slow(MetadataType mdtype) const {
hseigel@5528:   if (mdtype == ClassType) {
hseigel@5528:     return using_class_space() ? class_vsm()->sum_used_in_chunks_in_use() : 0;
hseigel@5528:   } else {
hseigel@5528:     return vsm()->sum_used_in_chunks_in_use();  // includes overhead!
hseigel@5528:   }
coleenp@4037: }
coleenp@4037: 
ehelin@5703: size_t Metaspace::free_words_slow(MetadataType mdtype) const {
hseigel@5528:   if (mdtype == ClassType) {
hseigel@5528:     return using_class_space() ? class_vsm()->sum_free_in_chunks_in_use() : 0;
hseigel@5528:   } else {
hseigel@5528:     return vsm()->sum_free_in_chunks_in_use();
hseigel@5528:   }
coleenp@4037: }
coleenp@4037: 
coleenp@4037: // Space capacity in the Metaspace.  It includes
coleenp@4037: // space in the list of chunks from which allocations
coleenp@4037: // have been made. Don't include space in the global freelist and
coleenp@4037: // in the space available in the dictionary which
coleenp@4037: // is already counted in some chunk.
jmasa@5015: size_t Metaspace::capacity_words_slow(MetadataType mdtype) const {
hseigel@5528:   if (mdtype == ClassType) {
hseigel@5528:     return using_class_space() ? class_vsm()->sum_capacity_in_chunks_in_use() : 0;
hseigel@5528:   } else {
hseigel@5528:     return vsm()->sum_capacity_in_chunks_in_use();
hseigel@5528:   }
coleenp@4037: }
coleenp@4037: 
jmasa@5015: size_t Metaspace::used_bytes_slow(MetadataType mdtype) const {
jmasa@5015:   return used_words_slow(mdtype) * BytesPerWord;
jmasa@5015: }
jmasa@5015: 
jmasa@5015: size_t Metaspace::capacity_bytes_slow(MetadataType mdtype) const {
jmasa@5015:   return capacity_words_slow(mdtype) * BytesPerWord;
jmasa@5015: }
jmasa@5015: 
coleenp@4037: void Metaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) {
coleenp@4037:   if (SafepointSynchronize::is_at_safepoint()) {
iklam@7089:     if (DumpSharedSpaces && PrintSharedSpaces) {
iklam@7089:       record_deallocation(ptr, vsm()->get_raw_word_size(word_size));
iklam@7089:     }
iklam@7089: 
coleenp@4037:     assert(Thread::current()->is_VM_thread(), "should be the VM thread");
jmasa@4196:     // Don't take Heap_lock
mgerdin@5023:     MutexLockerEx ml(vsm()->lock(), Mutex::_no_safepoint_check_flag);
goetz@6337:     if (word_size < TreeChunk<Metablock, FreeList<Metablock> >::min_size()) {
jmasa@4196:       // Dark matter.  Too small for dictionary.
jmasa@4196: #ifdef ASSERT
jmasa@4196:       Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5);
jmasa@4196: #endif
jmasa@4196:       return;
jmasa@4196:     }
hseigel@5528:     if (is_class && using_class_space()) {
hseigel@5528:       class_vsm()->deallocate(ptr, word_size);
coleenp@4037:     } else {
jmasa@4196:       vsm()->deallocate(ptr, word_size);
coleenp@4037:     }
coleenp@4037:   } else {
mgerdin@5023:     MutexLockerEx ml(vsm()->lock(), Mutex::_no_safepoint_check_flag);
coleenp@4037: 
goetz@6337:     if (word_size < TreeChunk<Metablock, FreeList<Metablock> >::min_size()) {
jmasa@4196:       // Dark matter.  Too small for dictionary.
jmasa@4196: #ifdef ASSERT
jmasa@4196:       Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5);
jmasa@4196: #endif
jmasa@4196:       return;
jmasa@4196:     }
hseigel@5528:     if (is_class && using_class_space()) {
jmasa@4196:       class_vsm()->deallocate(ptr, word_size);
coleenp@4037:     } else {
jmasa@4196:       vsm()->deallocate(ptr, word_size);
coleenp@4037:     }
coleenp@4037:   }
coleenp@4037: }
coleenp@4037: 
stefank@5863: 
stefank@5941: MetaWord* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size,
iklam@5208:                               bool read_only, MetaspaceObj::Type type, TRAPS) {
coleenp@4037:   if (HAS_PENDING_EXCEPTION) {
coleenp@4037:     assert(false, "Should not allocate with exception pending");
coleenp@4037:     return NULL;  // caller does a CHECK_NULL too
coleenp@4037:   }
coleenp@4037: 
coleenp@4037:   assert(loader_data != NULL, "Should never pass around a NULL loader_data. "
coleenp@4037:         "ClassLoaderData::the_null_class_loader_data() should have been used.");
stefank@5863: 
coleenp@4037:   // Allocate in metaspaces without taking out a lock, because it deadlocks
coleenp@4037:   // with the SymbolTable_lock.  Dumping is single threaded for now.  We'll have
coleenp@4037:   // to revisit this for application class data sharing.
coleenp@4037:   if (DumpSharedSpaces) {
iklam@5208:     assert(type > MetaspaceObj::UnknownType && type < MetaspaceObj::_number_of_types, "sanity");
iklam@5208:     Metaspace* space = read_only ? loader_data->ro_metaspace() : loader_data->rw_metaspace();
stefank@5863:     MetaWord* result = space->allocate(word_size, NonClassType);
coleenp@4037:     if (result == NULL) {
coleenp@4037:       report_out_of_shared_space(read_only ? SharedReadOnly : SharedReadWrite);
coleenp@4037:     }
iklam@7089:     if (PrintSharedSpaces) {
iklam@7089:       space->record_allocation(result, type, space->vsm()->get_raw_word_size(word_size));
iklam@7089:     }
stefank@5941: 
stefank@5941:     // Zero initialize.
stefank@5941:     Copy::fill_to_aligned_words((HeapWord*)result, word_size, 0);
stefank@5941: 
stefank@5941:     return result;
coleenp@4037:   }
coleenp@4037: 
stefank@5863:   MetadataType mdtype = (type == MetaspaceObj::ClassType) ? ClassType : NonClassType;
stefank@5863: 
stefank@5863:   // Try to allocate metadata.
stefank@5863:   MetaWord* result = loader_data->metaspace_non_null()->allocate(word_size, mdtype);
coleenp@4037: 
coleenp@4037:   if (result == NULL) {
ehelin@6418:     tracer()->report_metaspace_allocation_failure(loader_data, word_size, type, mdtype);
ehelin@6418: 
stefank@5863:     // Allocation failed.
stefank@5863:     if (is_init_completed()) {
stefank@5863:       // Only start a GC if the bootstrapping has completed.
stefank@5863: 
stefank@5863:       // Try to clean out some memory and retry.
stefank@5863:       result = Universe::heap()->collector_policy()->satisfy_failed_metadata_allocation(
stefank@5863:           loader_data, word_size, mdtype);
coleenp@4037:     }
coleenp@4037:   }
stefank@5863: 
stefank@5863:   if (result == NULL) {
jwilhelm@7867:     report_metadata_oome(loader_data, word_size, type, mdtype, CHECK_NULL);
stefank@5863:   }
stefank@5863: 
stefank@5941:   // Zero initialize.
stefank@5941:   Copy::fill_to_aligned_words((HeapWord*)result, word_size, 0);
stefank@5941: 
stefank@5941:   return result;
coleenp@4037: }
coleenp@4037: 
hseigel@6027: size_t Metaspace::class_chunk_size(size_t word_size) {
hseigel@6027:   assert(using_class_space(), "Has to use class space");
hseigel@6027:   return class_vsm()->calc_chunk_size(word_size);
hseigel@6027: }
hseigel@6027: 
ehelin@6419: void Metaspace::report_metadata_oome(ClassLoaderData* loader_data, size_t word_size, MetaspaceObj::Type type, MetadataType mdtype, TRAPS) {
ehelin@6419:   tracer()->report_metadata_oom(loader_data, word_size, type, mdtype);
ehelin@6419: 
stefank@5863:   // If result is still null, we are out of memory.
stefank@5863:   if (Verbose && TraceMetadataChunkAllocation) {
stefank@5863:     gclog_or_tty->print_cr("Metaspace allocation failed for size "
stefank@5863:         SIZE_FORMAT, word_size);
stefank@5863:     if (loader_data->metaspace_or_null() != NULL) {
stefank@5863:       loader_data->dump(gclog_or_tty);
stefank@5863:     }
stefank@5863:     MetaspaceAux::dump(gclog_or_tty);
stefank@5863:   }
stefank@5863: 
hseigel@6027:   bool out_of_compressed_class_space = false;
hseigel@6027:   if (is_class_space_allocation(mdtype)) {
hseigel@6027:     Metaspace* metaspace = loader_data->metaspace_non_null();
hseigel@6027:     out_of_compressed_class_space =
hseigel@6027:       MetaspaceAux::committed_bytes(Metaspace::ClassType) +
hseigel@6027:       (metaspace->class_chunk_size(word_size) * BytesPerWord) >
hseigel@6027:       CompressedClassSpaceSize;
hseigel@6027:   }
hseigel@6027: 
stefank@5863:   // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support
hseigel@6027:   const char* space_string = out_of_compressed_class_space ?
hseigel@6027:     "Compressed class space" : "Metaspace";
hseigel@6027: 
stefank@5863:   report_java_out_of_memory(space_string);
stefank@5863: 
stefank@5863:   if (JvmtiExport::should_post_resource_exhausted()) {
stefank@5863:     JvmtiExport::post_resource_exhausted(
stefank@5863:         JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR,
stefank@5863:         space_string);
stefank@5863:   }
stefank@5863: 
stefank@5863:   if (!is_init_completed()) {
stefank@5863:     vm_exit_during_initialization("OutOfMemoryError", space_string);
stefank@5863:   }
stefank@5863: 
hseigel@6027:   if (out_of_compressed_class_space) {
stefank@5863:     THROW_OOP(Universe::out_of_memory_error_class_metaspace());
stefank@5863:   } else {
stefank@5863:     THROW_OOP(Universe::out_of_memory_error_metaspace());
stefank@5863:   }
stefank@5863: }
stefank@5863: 
ehelin@6418: const char* Metaspace::metadata_type_name(Metaspace::MetadataType mdtype) {
ehelin@6418:   switch (mdtype) {
ehelin@6418:     case Metaspace::ClassType: return "Class";
ehelin@6418:     case Metaspace::NonClassType: return "Metadata";
ehelin@6418:     default:
ehelin@6418:       assert(false, err_msg("Got bad mdtype: %d", (int) mdtype));
ehelin@6418:       return NULL;
ehelin@6418:   }
ehelin@6418: }
ehelin@6418: 
iklam@5208: void Metaspace::record_allocation(void* ptr, MetaspaceObj::Type type, size_t word_size) {
iklam@5208:   assert(DumpSharedSpaces, "sanity");
iklam@5208: 
iklam@7089:   int byte_size = (int)word_size * HeapWordSize;
iklam@7089:   AllocRecord *rec = new AllocRecord((address)ptr, type, byte_size);
iklam@7089: 
iklam@5208:   if (_alloc_record_head == NULL) {
iklam@5208:     _alloc_record_head = _alloc_record_tail = rec;
iklam@7089:   } else if (_alloc_record_tail->_ptr + _alloc_record_tail->_byte_size == (address)ptr) {
iklam@5208:     _alloc_record_tail->_next = rec;
iklam@5208:     _alloc_record_tail = rec;
iklam@7089:   } else {
iklam@7089:     // slow linear search, but this doesn't happen that often, and only when dumping
iklam@7089:     for (AllocRecord *old = _alloc_record_head; old; old = old->_next) {
iklam@7089:       if (old->_ptr == ptr) {
iklam@7089:         assert(old->_type == MetaspaceObj::DeallocatedType, "sanity");
iklam@7089:         int remain_bytes = old->_byte_size - byte_size;
iklam@7089:         assert(remain_bytes >= 0, "sanity");
iklam@7089:         old->_type = type;
iklam@7089: 
iklam@7089:         if (remain_bytes == 0) {
iklam@7089:           delete(rec);
iklam@7089:         } else {
iklam@7089:           address remain_ptr = address(ptr) + byte_size;
iklam@7089:           rec->_ptr = remain_ptr;
iklam@7089:           rec->_byte_size = remain_bytes;
iklam@7089:           rec->_type = MetaspaceObj::DeallocatedType;
iklam@7089:           rec->_next = old->_next;
iklam@7089:           old->_byte_size = byte_size;
iklam@7089:           old->_next = rec;
iklam@7089:         }
iklam@7089:         return;
iklam@7089:       }
iklam@7089:     }
iklam@7089:     assert(0, "reallocating a freed pointer that was not recorded");
iklam@5208:   }
iklam@5208: }
iklam@5208: 
iklam@7089: void Metaspace::record_deallocation(void* ptr, size_t word_size) {
iklam@7089:   assert(DumpSharedSpaces, "sanity");
iklam@7089: 
iklam@7089:   for (AllocRecord *rec = _alloc_record_head; rec; rec = rec->_next) {
iklam@7089:     if (rec->_ptr == ptr) {
iklam@7089:       assert(rec->_byte_size == (int)word_size * HeapWordSize, "sanity");
iklam@7089:       rec->_type = MetaspaceObj::DeallocatedType;
iklam@7089:       return;
iklam@7089:     }
iklam@7089:   }
iklam@7089: 
iklam@7089:   assert(0, "deallocating a pointer that was not recorded");
iklam@7089: }
iklam@7089: 
iklam@5208: void Metaspace::iterate(Metaspace::AllocRecordClosure *closure) {
iklam@5208:   assert(DumpSharedSpaces, "unimplemented for !DumpSharedSpaces");
iklam@5208: 
iklam@5208:   address last_addr = (address)bottom();
iklam@5208: 
iklam@5208:   for (AllocRecord *rec = _alloc_record_head; rec; rec = rec->_next) {
iklam@5208:     address ptr = rec->_ptr;
iklam@5208:     if (last_addr < ptr) {
iklam@5208:       closure->doit(last_addr, MetaspaceObj::UnknownType, ptr - last_addr);
iklam@5208:     }
iklam@5208:     closure->doit(ptr, rec->_type, rec->_byte_size);
iklam@5208:     last_addr = ptr + rec->_byte_size;
iklam@5208:   }
iklam@5208: 
iklam@5208:   address top = ((address)bottom()) + used_bytes_slow(Metaspace::NonClassType);
iklam@5208:   if (last_addr < top) {
iklam@5208:     closure->doit(last_addr, MetaspaceObj::UnknownType, top - last_addr);
iklam@5208:   }
iklam@5208: }
iklam@5208: 
stefank@5771: void Metaspace::purge(MetadataType mdtype) {
stefank@5771:   get_space_list(mdtype)->purge(get_chunk_manager(mdtype));
stefank@5771: }
stefank@5771: 
jmasa@5007: void Metaspace::purge() {
jmasa@5007:   MutexLockerEx cl(SpaceManager::expand_lock(),
jmasa@5007:                    Mutex::_no_safepoint_check_flag);
stefank@5771:   purge(NonClassType);
hseigel@5528:   if (using_class_space()) {
stefank@5771:     purge(ClassType);
hseigel@5528:   }
jmasa@5007: }
jmasa@5007: 
coleenp@4037: void Metaspace::print_on(outputStream* out) const {
coleenp@4037:   // Print both class virtual space counts and metaspace.
coleenp@4037:   if (Verbose) {
hseigel@5528:     vsm()->print_on(out);
hseigel@5528:     if (using_class_space()) {
coleenp@4037:       class_vsm()->print_on(out);
hseigel@5528:     }
coleenp@4037:   }
coleenp@4037: }
coleenp@4037: 
coleenp@6305: bool Metaspace::contains(const void* ptr) {
coleenp@6678:   if (UseSharedSpaces && MetaspaceShared::is_in_shared_space(ptr)) {
coleenp@6678:     return true;
coleenp@4037:   }
coleenp@6678: 
coleenp@6678:   if (using_class_space() && get_space_list(ClassType)->contains(ptr)) {
coleenp@6678:      return true;
coleenp@6678:   }
coleenp@6678: 
coleenp@6678:   return get_space_list(NonClassType)->contains(ptr);
coleenp@4037: }
coleenp@4037: 
coleenp@4037: void Metaspace::verify() {
coleenp@4037:   vsm()->verify();
hseigel@5528:   if (using_class_space()) {
hseigel@5528:     class_vsm()->verify();
hseigel@5528:   }
coleenp@4037: }
coleenp@4037: 
coleenp@4037: void Metaspace::dump(outputStream* const out) const {
coleenp@4037:   out->print_cr("\nVirtual space manager: " INTPTR_FORMAT, vsm());
coleenp@4037:   vsm()->dump(out);
hseigel@5528:   if (using_class_space()) {
hseigel@5528:     out->print_cr("\nClass space manager: " INTPTR_FORMAT, class_vsm());
hseigel@5528:     class_vsm()->dump(out);
hseigel@5528:   }
coleenp@4037: }
stefank@5704: 
stefank@5704: /////////////// Unit tests ///////////////
stefank@5704: 
stefank@5704: #ifndef PRODUCT
stefank@5704: 
brutisso@5774: class TestMetaspaceAuxTest : AllStatic {
stefank@5704:  public:
stefank@5704:   static void test_reserved() {
stefank@5704:     size_t reserved = MetaspaceAux::reserved_bytes();
stefank@5704: 
stefank@5704:     assert(reserved > 0, "assert");
stefank@5704: 
stefank@5704:     size_t committed  = MetaspaceAux::committed_bytes();
stefank@5704:     assert(committed <= reserved, "assert");
stefank@5704: 
stefank@5704:     size_t reserved_metadata = MetaspaceAux::reserved_bytes(Metaspace::NonClassType);
stefank@5704:     assert(reserved_metadata > 0, "assert");
stefank@5704:     assert(reserved_metadata <= reserved, "assert");
stefank@5704: 
stefank@5704:     if (UseCompressedClassPointers) {
stefank@5704:       size_t reserved_class    = MetaspaceAux::reserved_bytes(Metaspace::ClassType);
stefank@5704:       assert(reserved_class > 0, "assert");
stefank@5704:       assert(reserved_class < reserved, "assert");
stefank@5704:     }
stefank@5704:   }
stefank@5704: 
stefank@5704:   static void test_committed() {
stefank@5704:     size_t committed = MetaspaceAux::committed_bytes();
stefank@5704: 
stefank@5704:     assert(committed > 0, "assert");
stefank@5704: 
stefank@5704:     size_t reserved  = MetaspaceAux::reserved_bytes();
stefank@5704:     assert(committed <= reserved, "assert");
stefank@5704: 
stefank@5704:     size_t committed_metadata = MetaspaceAux::committed_bytes(Metaspace::NonClassType);
stefank@5704:     assert(committed_metadata > 0, "assert");
stefank@5704:     assert(committed_metadata <= committed, "assert");
stefank@5704: 
stefank@5704:     if (UseCompressedClassPointers) {
stefank@5704:       size_t committed_class    = MetaspaceAux::committed_bytes(Metaspace::ClassType);
stefank@5704:       assert(committed_class > 0, "assert");
stefank@5704:       assert(committed_class < committed, "assert");
stefank@5704:     }
stefank@5704:   }
stefank@5704: 
brutisso@5774:   static void test_virtual_space_list_large_chunk() {
brutisso@5774:     VirtualSpaceList* vs_list = new VirtualSpaceList(os::vm_allocation_granularity());
brutisso@5774:     MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
brutisso@5774:     // A size larger than VirtualSpaceSize (256k) and add one page to make it _not_ be
brutisso@5774:     // vm_allocation_granularity aligned on Windows.
brutisso@5774:     size_t large_size = (size_t)(2*256*K + (os::vm_page_size()/BytesPerWord));
brutisso@5774:     large_size += (os::vm_page_size()/BytesPerWord);
brutisso@5774:     vs_list->get_new_chunk(large_size, large_size, 0);
brutisso@5774:   }
brutisso@5774: 
stefank@5704:   static void test() {
stefank@5704:     test_reserved();
stefank@5704:     test_committed();
brutisso@5774:     test_virtual_space_list_large_chunk();
stefank@5704:   }
stefank@5704: };
stefank@5704: 
brutisso@5774: void TestMetaspaceAux_test() {
brutisso@5774:   TestMetaspaceAuxTest::test();
stefank@5704: }
stefank@5704: 
mgerdin@6004: class TestVirtualSpaceNodeTest {
mgerdin@6004:   static void chunk_up(size_t words_left, size_t& num_medium_chunks,
mgerdin@6004:                                           size_t& num_small_chunks,
mgerdin@6004:                                           size_t& num_specialized_chunks) {
mgerdin@6004:     num_medium_chunks = words_left / MediumChunk;
mgerdin@6004:     words_left = words_left % MediumChunk;
mgerdin@6004: 
mgerdin@6004:     num_small_chunks = words_left / SmallChunk;
mgerdin@6004:     words_left = words_left % SmallChunk;
mgerdin@6004:     // how many specialized chunks can we get?
mgerdin@6004:     num_specialized_chunks = words_left / SpecializedChunk;
mgerdin@6004:     assert(words_left % SpecializedChunk == 0, "should be nothing left");
mgerdin@6004:   }
mgerdin@6004: 
mgerdin@6004:  public:
mgerdin@6004:   static void test() {
mgerdin@6004:     MutexLockerEx ml(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
mgerdin@6004:     const size_t vsn_test_size_words = MediumChunk  * 4;
mgerdin@6004:     const size_t vsn_test_size_bytes = vsn_test_size_words * BytesPerWord;
mgerdin@6004: 
mgerdin@6004:     // The chunk sizes must be multiples of eachother, or this will fail
mgerdin@6004:     STATIC_ASSERT(MediumChunk % SmallChunk == 0);
mgerdin@6004:     STATIC_ASSERT(SmallChunk % SpecializedChunk == 0);
mgerdin@6004: 
mgerdin@6004:     { // No committed memory in VSN
mgerdin@6004:       ChunkManager cm(SpecializedChunk, SmallChunk, MediumChunk);
mgerdin@6004:       VirtualSpaceNode vsn(vsn_test_size_bytes);
mgerdin@6004:       vsn.initialize();
mgerdin@6004:       vsn.retire(&cm);
mgerdin@6004:       assert(cm.sum_free_chunks_count() == 0, "did not commit any memory in the VSN");
mgerdin@6004:     }
mgerdin@6004: 
mgerdin@6004:     { // All of VSN is committed, half is used by chunks
mgerdin@6004:       ChunkManager cm(SpecializedChunk, SmallChunk, MediumChunk);
mgerdin@6004:       VirtualSpaceNode vsn(vsn_test_size_bytes);
mgerdin@6004:       vsn.initialize();
mgerdin@6004:       vsn.expand_by(vsn_test_size_words, vsn_test_size_words);
mgerdin@6004:       vsn.get_chunk_vs(MediumChunk);
mgerdin@6004:       vsn.get_chunk_vs(MediumChunk);
mgerdin@6004:       vsn.retire(&cm);
mgerdin@6004:       assert(cm.sum_free_chunks_count() == 2, "should have been memory left for 2 medium chunks");
mgerdin@6004:       assert(cm.sum_free_chunks() == 2*MediumChunk, "sizes should add up");
mgerdin@6004:     }
mgerdin@6004: 
mgerdin@6004:     { // 4 pages of VSN is committed, some is used by chunks
mgerdin@6004:       ChunkManager cm(SpecializedChunk, SmallChunk, MediumChunk);
mgerdin@6004:       VirtualSpaceNode vsn(vsn_test_size_bytes);
mgerdin@6004:       const size_t page_chunks = 4 * (size_t)os::vm_page_size() / BytesPerWord;
mgerdin@6004:       assert(page_chunks < MediumChunk, "Test expects medium chunks to be at least 4*page_size");
mgerdin@6004:       vsn.initialize();
mgerdin@6004:       vsn.expand_by(page_chunks, page_chunks);
mgerdin@6004:       vsn.get_chunk_vs(SmallChunk);
mgerdin@6004:       vsn.get_chunk_vs(SpecializedChunk);
mgerdin@6004:       vsn.retire(&cm);
mgerdin@6004: 
mgerdin@6004:       // committed - used = words left to retire
mgerdin@6004:       const size_t words_left = page_chunks - SmallChunk - SpecializedChunk;
mgerdin@6004: 
mgerdin@6004:       size_t num_medium_chunks, num_small_chunks, num_spec_chunks;
mgerdin@6004:       chunk_up(words_left, num_medium_chunks, num_small_chunks, num_spec_chunks);
mgerdin@6004: 
mgerdin@6004:       assert(num_medium_chunks == 0, "should not get any medium chunks");
mgerdin@6004:       assert(cm.sum_free_chunks_count() == (num_small_chunks + num_spec_chunks), "should be space for 3 chunks");
mgerdin@6004:       assert(cm.sum_free_chunks() == words_left, "sizes should add up");
mgerdin@6004:     }
mgerdin@6004: 
mgerdin@6004:     { // Half of VSN is committed, a humongous chunk is used
mgerdin@6004:       ChunkManager cm(SpecializedChunk, SmallChunk, MediumChunk);
mgerdin@6004:       VirtualSpaceNode vsn(vsn_test_size_bytes);
mgerdin@6004:       vsn.initialize();
mgerdin@6004:       vsn.expand_by(MediumChunk * 2, MediumChunk * 2);
mgerdin@6004:       vsn.get_chunk_vs(MediumChunk + SpecializedChunk); // Humongous chunks will be aligned up to MediumChunk + SpecializedChunk
mgerdin@6004:       vsn.retire(&cm);
mgerdin@6004: 
mgerdin@6004:       const size_t words_left = MediumChunk * 2 - (MediumChunk + SpecializedChunk);
mgerdin@6004:       size_t num_medium_chunks, num_small_chunks, num_spec_chunks;
mgerdin@6004:       chunk_up(words_left, num_medium_chunks, num_small_chunks, num_spec_chunks);
mgerdin@6004: 
mgerdin@6004:       assert(num_medium_chunks == 0, "should not get any medium chunks");
mgerdin@6004:       assert(cm.sum_free_chunks_count() == (num_small_chunks + num_spec_chunks), "should be space for 3 chunks");
mgerdin@6004:       assert(cm.sum_free_chunks() == words_left, "sizes should add up");
mgerdin@6004:     }
mgerdin@6004: 
mgerdin@6004:   }
stefank@6170: 
stefank@6170: #define assert_is_available_positive(word_size) \
stefank@6170:   assert(vsn.is_available(word_size), \
stefank@6170:     err_msg(#word_size ": " PTR_FORMAT " bytes were not available in " \
stefank@6170:             "VirtualSpaceNode [" PTR_FORMAT ", " PTR_FORMAT ")", \
stefank@6170:             (uintptr_t)(word_size * BytesPerWord), vsn.bottom(), vsn.end()));
stefank@6170: 
stefank@6170: #define assert_is_available_negative(word_size) \
stefank@6170:   assert(!vsn.is_available(word_size), \
stefank@6170:     err_msg(#word_size ": " PTR_FORMAT " bytes should not be available in " \
stefank@6170:             "VirtualSpaceNode [" PTR_FORMAT ", " PTR_FORMAT ")", \
stefank@6170:             (uintptr_t)(word_size * BytesPerWord), vsn.bottom(), vsn.end()));
stefank@6170: 
stefank@6170:   static void test_is_available_positive() {
stefank@6170:     // Reserve some memory.
stefank@6170:     VirtualSpaceNode vsn(os::vm_allocation_granularity());
stefank@6170:     assert(vsn.initialize(), "Failed to setup VirtualSpaceNode");
stefank@6170: 
stefank@6170:     // Commit some memory.
stefank@6170:     size_t commit_word_size = os::vm_allocation_granularity() / BytesPerWord;
stefank@6170:     bool expanded = vsn.expand_by(commit_word_size, commit_word_size);
stefank@6170:     assert(expanded, "Failed to commit");
stefank@6170: 
stefank@6170:     // Check that is_available accepts the committed size.
stefank@6170:     assert_is_available_positive(commit_word_size);
stefank@6170: 
stefank@6170:     // Check that is_available accepts half the committed size.
stefank@6170:     size_t expand_word_size = commit_word_size / 2;
stefank@6170:     assert_is_available_positive(expand_word_size);
stefank@6170:   }
stefank@6170: 
stefank@6170:   static void test_is_available_negative() {
stefank@6170:     // Reserve some memory.
stefank@6170:     VirtualSpaceNode vsn(os::vm_allocation_granularity());
stefank@6170:     assert(vsn.initialize(), "Failed to setup VirtualSpaceNode");
stefank@6170: 
stefank@6170:     // Commit some memory.
stefank@6170:     size_t commit_word_size = os::vm_allocation_granularity() / BytesPerWord;
stefank@6170:     bool expanded = vsn.expand_by(commit_word_size, commit_word_size);
stefank@6170:     assert(expanded, "Failed to commit");
stefank@6170: 
stefank@6170:     // Check that is_available doesn't accept a too large size.
stefank@6170:     size_t two_times_commit_word_size = commit_word_size * 2;
stefank@6170:     assert_is_available_negative(two_times_commit_word_size);
stefank@6170:   }
stefank@6170: 
stefank@6170:   static void test_is_available_overflow() {
stefank@6170:     // Reserve some memory.
stefank@6170:     VirtualSpaceNode vsn(os::vm_allocation_granularity());
stefank@6170:     assert(vsn.initialize(), "Failed to setup VirtualSpaceNode");
stefank@6170: 
stefank@6170:     // Commit some memory.
stefank@6170:     size_t commit_word_size = os::vm_allocation_granularity() / BytesPerWord;
stefank@6170:     bool expanded = vsn.expand_by(commit_word_size, commit_word_size);
stefank@6170:     assert(expanded, "Failed to commit");
stefank@6170: 
stefank@6170:     // Calculate a size that will overflow the virtual space size.
stefank@6170:     void* virtual_space_max = (void*)(uintptr_t)-1;
stefank@6170:     size_t bottom_to_max = pointer_delta(virtual_space_max, vsn.bottom(), 1);
stefank@6170:     size_t overflow_size = bottom_to_max + BytesPerWord;
stefank@6170:     size_t overflow_word_size = overflow_size / BytesPerWord;
stefank@6170: 
stefank@6170:     // Check that is_available can handle the overflow.
stefank@6170:     assert_is_available_negative(overflow_word_size);
stefank@6170:   }
stefank@6170: 
stefank@6170:   static void test_is_available() {
stefank@6170:     TestVirtualSpaceNodeTest::test_is_available_positive();
stefank@6170:     TestVirtualSpaceNodeTest::test_is_available_negative();
stefank@6170:     TestVirtualSpaceNodeTest::test_is_available_overflow();
stefank@6170:   }
mgerdin@6004: };
mgerdin@6004: 
mgerdin@6004: void TestVirtualSpaceNode_test() {
mgerdin@6004:   TestVirtualSpaceNodeTest::test();
stefank@6170:   TestVirtualSpaceNodeTest::test_is_available();
mgerdin@6004: }
stefank@5704: #endif