| /* |
| * Copyright (c) 2011, 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| #include "precompiled.hpp" |
| #include "aot/aotLoader.hpp" |
| #include "gc/shared/collectedHeap.hpp" |
| #include "gc/shared/collectorPolicy.hpp" |
| #include "gc/shared/gcLocker.hpp" |
| #include "logging/log.hpp" |
| #include "memory/allocation.hpp" |
| #include "memory/binaryTreeDictionary.hpp" |
| #include "memory/filemap.hpp" |
| #include "memory/freeList.hpp" |
| #include "memory/metachunk.hpp" |
| #include "memory/metaspace.hpp" |
| #include "memory/metaspaceGCThresholdUpdater.hpp" |
| #include "memory/metaspaceShared.hpp" |
| #include "memory/metaspaceTracer.hpp" |
| #include "memory/resourceArea.hpp" |
| #include "memory/universe.hpp" |
| #include "runtime/atomic.hpp" |
| #include "runtime/globals.hpp" |
| #include "runtime/init.hpp" |
| #include "runtime/java.hpp" |
| #include "runtime/mutex.hpp" |
| #include "runtime/orderAccess.inline.hpp" |
| #include "services/memTracker.hpp" |
| #include "services/memoryService.hpp" |
| #include "utilities/copy.hpp" |
| #include "utilities/debug.hpp" |
| #include "utilities/macros.hpp" |
| |
| typedef BinaryTreeDictionary<Metablock, FreeList<Metablock> > BlockTreeDictionary; |
| typedef BinaryTreeDictionary<Metachunk, FreeList<Metachunk> > ChunkTreeDictionary; |
| |
| // Set this constant to enable slow integrity checking of the free chunk lists |
| const bool metaspace_slow_verify = false; |
| |
| size_t const allocation_from_dictionary_limit = 4 * K; |
| |
| MetaWord* last_allocated = 0; |
| |
| size_t Metaspace::_compressed_class_space_size; |
| const MetaspaceTracer* Metaspace::_tracer = NULL; |
| |
| // Used in declarations in SpaceManager and ChunkManager |
| enum ChunkIndex { |
| ZeroIndex = 0, |
| SpecializedIndex = ZeroIndex, |
| SmallIndex = SpecializedIndex + 1, |
| MediumIndex = SmallIndex + 1, |
| HumongousIndex = MediumIndex + 1, |
| NumberOfFreeLists = 3, |
| NumberOfInUseLists = 4 |
| }; |
| |
| enum ChunkSizes { // in words. |
| ClassSpecializedChunk = 128, |
| SpecializedChunk = 128, |
| ClassSmallChunk = 256, |
| SmallChunk = 512, |
| ClassMediumChunk = 4 * K, |
| MediumChunk = 8 * K |
| }; |
| |
| static ChunkIndex next_chunk_index(ChunkIndex i) { |
| assert(i < NumberOfInUseLists, "Out of bound"); |
| return (ChunkIndex) (i+1); |
| } |
| |
| volatile intptr_t MetaspaceGC::_capacity_until_GC = 0; |
| uint MetaspaceGC::_shrink_factor = 0; |
| bool MetaspaceGC::_should_concurrent_collect = false; |
| |
| typedef class FreeList<Metachunk> ChunkList; |
| |
| // Manages the global free lists of chunks. |
| class ChunkManager : public CHeapObj<mtInternal> { |
| friend class TestVirtualSpaceNodeTest; |
| |
| // Free list of chunks of different sizes. |
| // SpecializedChunk |
| // SmallChunk |
| // MediumChunk |
| // HumongousChunk |
| ChunkList _free_chunks[NumberOfFreeLists]; |
| |
| // HumongousChunk |
| ChunkTreeDictionary _humongous_dictionary; |
| |
| // ChunkManager in all lists of this type |
| size_t _free_chunks_total; |
| size_t _free_chunks_count; |
| |
| void dec_free_chunks_total(size_t v) { |
| assert(_free_chunks_count > 0 && |
| _free_chunks_total > 0, |
| "About to go negative"); |
| Atomic::add_ptr(-1, &_free_chunks_count); |
| jlong minus_v = (jlong) - (jlong) v; |
| Atomic::add_ptr(minus_v, &_free_chunks_total); |
| } |
| |
| // Debug support |
| |
| size_t sum_free_chunks(); |
| size_t sum_free_chunks_count(); |
| |
| void locked_verify_free_chunks_total(); |
| void slow_locked_verify_free_chunks_total() { |
| if (metaspace_slow_verify) { |
| locked_verify_free_chunks_total(); |
| } |
| } |
| void locked_verify_free_chunks_count(); |
| void slow_locked_verify_free_chunks_count() { |
| if (metaspace_slow_verify) { |
| locked_verify_free_chunks_count(); |
| } |
| } |
| void verify_free_chunks_count(); |
| |
| public: |
| |
| ChunkManager(size_t specialized_size, size_t small_size, size_t medium_size) |
| : _free_chunks_total(0), _free_chunks_count(0) { |
| _free_chunks[SpecializedIndex].set_size(specialized_size); |
| _free_chunks[SmallIndex].set_size(small_size); |
| _free_chunks[MediumIndex].set_size(medium_size); |
| } |
| |
| // add or delete (return) a chunk to the global freelist. |
| Metachunk* chunk_freelist_allocate(size_t word_size); |
| |
| // Map a size to a list index assuming that there are lists |
| // for special, small, medium, and humongous chunks. |
| ChunkIndex list_index(size_t size); |
| |
| // Remove the chunk from its freelist. It is |
| // expected to be on one of the _free_chunks[] lists. |
| void remove_chunk(Metachunk* chunk); |
| |
| // Add the simple linked list of chunks to the freelist of chunks |
| // of type index. |
| void return_chunks(ChunkIndex index, Metachunk* chunks); |
| |
| // Total of the space in the free chunks list |
| size_t free_chunks_total_words(); |
| size_t free_chunks_total_bytes(); |
| |
| // Number of chunks in the free chunks list |
| size_t free_chunks_count(); |
| |
| void inc_free_chunks_total(size_t v, size_t count = 1) { |
| Atomic::add_ptr(count, &_free_chunks_count); |
| Atomic::add_ptr(v, &_free_chunks_total); |
| } |
| ChunkTreeDictionary* humongous_dictionary() { |
| return &_humongous_dictionary; |
| } |
| |
| ChunkList* free_chunks(ChunkIndex index); |
| |
| // Returns the list for the given chunk word size. |
| ChunkList* find_free_chunks_list(size_t word_size); |
| |
| // Remove from a list by size. Selects list based on size of chunk. |
| Metachunk* free_chunks_get(size_t chunk_word_size); |
| |
| #define index_bounds_check(index) \ |
| assert(index == SpecializedIndex || \ |
| index == SmallIndex || \ |
| index == MediumIndex || \ |
| index == HumongousIndex, "Bad index: %d", (int) index) |
| |
| size_t num_free_chunks(ChunkIndex index) const { |
| index_bounds_check(index); |
| |
| if (index == HumongousIndex) { |
| return _humongous_dictionary.total_free_blocks(); |
| } |
| |
| ssize_t count = _free_chunks[index].count(); |
| return count == -1 ? 0 : (size_t) count; |
| } |
| |
| size_t size_free_chunks_in_bytes(ChunkIndex index) const { |
| index_bounds_check(index); |
| |
| size_t word_size = 0; |
| if (index == HumongousIndex) { |
| word_size = _humongous_dictionary.total_size(); |
| } else { |
| const size_t size_per_chunk_in_words = _free_chunks[index].size(); |
| word_size = size_per_chunk_in_words * num_free_chunks(index); |
| } |
| |
| return word_size * BytesPerWord; |
| } |
| |
| MetaspaceChunkFreeListSummary chunk_free_list_summary() const { |
| return MetaspaceChunkFreeListSummary(num_free_chunks(SpecializedIndex), |
| num_free_chunks(SmallIndex), |
| num_free_chunks(MediumIndex), |
| num_free_chunks(HumongousIndex), |
| size_free_chunks_in_bytes(SpecializedIndex), |
| size_free_chunks_in_bytes(SmallIndex), |
| size_free_chunks_in_bytes(MediumIndex), |
| size_free_chunks_in_bytes(HumongousIndex)); |
| } |
| |
| // Debug support |
| void verify(); |
| void slow_verify() { |
| if (metaspace_slow_verify) { |
| verify(); |
| } |
| } |
| void locked_verify(); |
| void slow_locked_verify() { |
| if (metaspace_slow_verify) { |
| locked_verify(); |
| } |
| } |
| void verify_free_chunks_total(); |
| |
| void locked_print_free_chunks(outputStream* st); |
| void locked_print_sum_free_chunks(outputStream* st); |
| |
| void print_on(outputStream* st) const; |
| }; |
| |
| class SmallBlocks : public CHeapObj<mtClass> { |
| const static uint _small_block_max_size = sizeof(TreeChunk<Metablock, FreeList<Metablock> >)/HeapWordSize; |
| const static uint _small_block_min_size = sizeof(Metablock)/HeapWordSize; |
| |
| private: |
| FreeList<Metablock> _small_lists[_small_block_max_size - _small_block_min_size]; |
| |
| FreeList<Metablock>& list_at(size_t word_size) { |
| assert(word_size >= _small_block_min_size, "There are no metaspace objects less than %u words", _small_block_min_size); |
| return _small_lists[word_size - _small_block_min_size]; |
| } |
| |
| public: |
| SmallBlocks() { |
| for (uint i = _small_block_min_size; i < _small_block_max_size; i++) { |
| uint k = i - _small_block_min_size; |
| _small_lists[k].set_size(i); |
| } |
| } |
| |
| size_t total_size() const { |
| size_t result = 0; |
| for (uint i = _small_block_min_size; i < _small_block_max_size; i++) { |
| uint k = i - _small_block_min_size; |
| result = result + _small_lists[k].count() * _small_lists[k].size(); |
| } |
| return result; |
| } |
| |
| static uint small_block_max_size() { return _small_block_max_size; } |
| static uint small_block_min_size() { return _small_block_min_size; } |
| |
| MetaWord* get_block(size_t word_size) { |
| if (list_at(word_size).count() > 0) { |
| MetaWord* new_block = (MetaWord*) list_at(word_size).get_chunk_at_head(); |
| return new_block; |
| } else { |
| return NULL; |
| } |
| } |
| void return_block(Metablock* free_chunk, size_t word_size) { |
| list_at(word_size).return_chunk_at_head(free_chunk, false); |
| assert(list_at(word_size).count() > 0, "Should have a chunk"); |
| } |
| |
| void print_on(outputStream* st) const { |
| st->print_cr("SmallBlocks:"); |
| for (uint i = _small_block_min_size; i < _small_block_max_size; i++) { |
| uint k = i - _small_block_min_size; |
| st->print_cr("small_lists size " SIZE_FORMAT " count " SIZE_FORMAT, _small_lists[k].size(), _small_lists[k].count()); |
| } |
| } |
| }; |
| |
| // Used to manage the free list of Metablocks (a block corresponds |
| // to the allocation of a quantum of metadata). |
| class BlockFreelist : public CHeapObj<mtClass> { |
| BlockTreeDictionary* const _dictionary; |
| SmallBlocks* _small_blocks; |
| |
| // Only allocate and split from freelist if the size of the allocation |
| // is at least 1/4th the size of the available block. |
| const static int WasteMultiplier = 4; |
| |
| // Accessors |
| BlockTreeDictionary* dictionary() const { return _dictionary; } |
| SmallBlocks* small_blocks() { |
| if (_small_blocks == NULL) { |
| _small_blocks = new SmallBlocks(); |
| } |
| return _small_blocks; |
| } |
| |
| public: |
| BlockFreelist(); |
| ~BlockFreelist(); |
| |
| // Get and return a block to the free list |
| MetaWord* get_block(size_t word_size); |
| void return_block(MetaWord* p, size_t word_size); |
| |
| size_t total_size() const { |
| size_t result = dictionary()->total_size(); |
| if (_small_blocks != NULL) { |
| result = result + _small_blocks->total_size(); |
| } |
| return result; |
| } |
| |
| static size_t min_dictionary_size() { return TreeChunk<Metablock, FreeList<Metablock> >::min_size(); } |
| void print_on(outputStream* st) const; |
| }; |
| |
| // A VirtualSpaceList node. |
| class VirtualSpaceNode : public CHeapObj<mtClass> { |
| friend class VirtualSpaceList; |
| |
| // Link to next VirtualSpaceNode |
| VirtualSpaceNode* _next; |
| |
| // total in the VirtualSpace |
| MemRegion _reserved; |
| ReservedSpace _rs; |
| VirtualSpace _virtual_space; |
| MetaWord* _top; |
| // count of chunks contained in this VirtualSpace |
| uintx _container_count; |
| |
| // Convenience functions to access the _virtual_space |
| char* low() const { return virtual_space()->low(); } |
| char* high() const { return virtual_space()->high(); } |
| |
| // The first Metachunk will be allocated at the bottom of the |
| // VirtualSpace |
| Metachunk* first_chunk() { return (Metachunk*) bottom(); } |
| |
| // Committed but unused space in the virtual space |
| size_t free_words_in_vs() const; |
| public: |
| |
| VirtualSpaceNode(size_t byte_size); |
| VirtualSpaceNode(ReservedSpace rs) : _top(NULL), _next(NULL), _rs(rs), _container_count(0) {} |
| ~VirtualSpaceNode(); |
| |
| // Convenience functions for logical bottom and end |
| MetaWord* bottom() const { return (MetaWord*) _virtual_space.low(); } |
| MetaWord* end() const { return (MetaWord*) _virtual_space.high(); } |
| |
| bool contains(const void* ptr) { return ptr >= low() && ptr < high(); } |
| |
| size_t reserved_words() const { return _virtual_space.reserved_size() / BytesPerWord; } |
| size_t committed_words() const { return _virtual_space.actual_committed_size() / BytesPerWord; } |
| |
| bool is_pre_committed() const { return _virtual_space.special(); } |
| |
| // address of next available space in _virtual_space; |
| // Accessors |
| VirtualSpaceNode* next() { return _next; } |
| void set_next(VirtualSpaceNode* v) { _next = v; } |
| |
| void set_reserved(MemRegion const v) { _reserved = v; } |
| void set_top(MetaWord* v) { _top = v; } |
| |
| // Accessors |
| MemRegion* reserved() { return &_reserved; } |
| VirtualSpace* virtual_space() const { return (VirtualSpace*) &_virtual_space; } |
| |
| // Returns true if "word_size" is available in the VirtualSpace |
| bool is_available(size_t word_size) { return word_size <= pointer_delta(end(), _top, sizeof(MetaWord)); } |
| |
| MetaWord* top() const { return _top; } |
| void inc_top(size_t word_size) { _top += word_size; } |
| |
| uintx container_count() { return _container_count; } |
| void inc_container_count(); |
| void dec_container_count(); |
| #ifdef ASSERT |
| uintx container_count_slow(); |
| void verify_container_count(); |
| #endif |
| |
| // used and capacity in this single entry in the list |
| size_t used_words_in_vs() const; |
| size_t capacity_words_in_vs() const; |
| |
| bool initialize(); |
| |
| // get space from the virtual space |
| Metachunk* take_from_committed(size_t chunk_word_size); |
| |
| // Allocate a chunk from the virtual space and return it. |
| Metachunk* get_chunk_vs(size_t chunk_word_size); |
| |
| // Expands/shrinks the committed space in a virtual space. Delegates |
| // to Virtualspace |
| bool expand_by(size_t min_words, size_t preferred_words); |
| |
| // In preparation for deleting this node, remove all the chunks |
| // in the node from any freelist. |
| void purge(ChunkManager* chunk_manager); |
| |
| // If an allocation doesn't fit in the current node a new node is created. |
| // Allocate chunks out of the remaining committed space in this node |
| // to avoid wasting that memory. |
| // This always adds up because all the chunk sizes are multiples of |
| // the smallest chunk size. |
| void retire(ChunkManager* chunk_manager); |
| |
| #ifdef ASSERT |
| // Debug support |
| void mangle(); |
| #endif |
| |
| void print_on(outputStream* st) const; |
| }; |
| |
| #define assert_is_ptr_aligned(ptr, alignment) \ |
| assert(is_ptr_aligned(ptr, alignment), \ |
| PTR_FORMAT " is not aligned to " \ |
| SIZE_FORMAT, p2i(ptr), alignment) |
| |
| #define assert_is_size_aligned(size, alignment) \ |
| assert(is_size_aligned(size, alignment), \ |
| SIZE_FORMAT " is not aligned to " \ |
| SIZE_FORMAT, size, alignment) |
| |
| |
| // Decide if large pages should be committed when the memory is reserved. |
| static bool should_commit_large_pages_when_reserving(size_t bytes) { |
| if (UseLargePages && UseLargePagesInMetaspace && !os::can_commit_large_page_memory()) { |
| size_t words = bytes / BytesPerWord; |
| bool is_class = false; // We never reserve large pages for the class space. |
| if (MetaspaceGC::can_expand(words, is_class) && |
| MetaspaceGC::allowed_expansion() >= words) { |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| // byte_size is the size of the associated virtualspace. |
| VirtualSpaceNode::VirtualSpaceNode(size_t bytes) : _top(NULL), _next(NULL), _rs(), _container_count(0) { |
| assert_is_size_aligned(bytes, Metaspace::reserve_alignment()); |
| |
| #if INCLUDE_CDS |
| // This allocates memory with mmap. For DumpSharedspaces, try to reserve |
| // configurable address, generally at the top of the Java heap so other |
| // memory addresses don't conflict. |
| if (DumpSharedSpaces) { |
| bool large_pages = false; // No large pages when dumping the CDS archive. |
| char* shared_base = (char*)align_ptr_up((char*)SharedBaseAddress, Metaspace::reserve_alignment()); |
| |
| _rs = ReservedSpace(bytes, Metaspace::reserve_alignment(), large_pages, shared_base); |
| if (_rs.is_reserved()) { |
| assert(shared_base == 0 || _rs.base() == shared_base, "should match"); |
| } else { |
| // Get a mmap region anywhere if the SharedBaseAddress fails. |
| _rs = ReservedSpace(bytes, Metaspace::reserve_alignment(), large_pages); |
| } |
| if (!_rs.is_reserved()) { |
| vm_exit_during_initialization("Unable to allocate memory for shared space", |
| err_msg(SIZE_FORMAT " bytes.", bytes)); |
| } |
| MetaspaceShared::initialize_shared_rs(&_rs); |
| } else |
| #endif |
| { |
| bool large_pages = should_commit_large_pages_when_reserving(bytes); |
| |
| _rs = ReservedSpace(bytes, Metaspace::reserve_alignment(), large_pages); |
| } |
| |
| if (_rs.is_reserved()) { |
| assert(_rs.base() != NULL, "Catch if we get a NULL address"); |
| assert(_rs.size() != 0, "Catch if we get a 0 size"); |
| assert_is_ptr_aligned(_rs.base(), Metaspace::reserve_alignment()); |
| assert_is_size_aligned(_rs.size(), Metaspace::reserve_alignment()); |
| |
| MemTracker::record_virtual_memory_type((address)_rs.base(), mtClass); |
| } |
| } |
| |
| void VirtualSpaceNode::purge(ChunkManager* chunk_manager) { |
| Metachunk* chunk = first_chunk(); |
| Metachunk* invalid_chunk = (Metachunk*) top(); |
| while (chunk < invalid_chunk ) { |
| assert(chunk->is_tagged_free(), "Should be tagged free"); |
| MetaWord* next = ((MetaWord*)chunk) + chunk->word_size(); |
| chunk_manager->remove_chunk(chunk); |
| assert(chunk->next() == NULL && |
| chunk->prev() == NULL, |
| "Was not removed from its list"); |
| chunk = (Metachunk*) next; |
| } |
| } |
| |
| #ifdef ASSERT |
| uintx VirtualSpaceNode::container_count_slow() { |
| uintx count = 0; |
| Metachunk* chunk = first_chunk(); |
| Metachunk* invalid_chunk = (Metachunk*) top(); |
| while (chunk < invalid_chunk ) { |
| MetaWord* next = ((MetaWord*)chunk) + chunk->word_size(); |
| // Don't count the chunks on the free lists. Those are |
| // still part of the VirtualSpaceNode but not currently |
| // counted. |
| if (!chunk->is_tagged_free()) { |
| count++; |
| } |
| chunk = (Metachunk*) next; |
| } |
| return count; |
| } |
| #endif |
| |
| // List of VirtualSpaces for metadata allocation. |
| class VirtualSpaceList : public CHeapObj<mtClass> { |
| friend class VirtualSpaceNode; |
| |
| enum VirtualSpaceSizes { |
| VirtualSpaceSize = 256 * K |
| }; |
| |
| // Head of the list |
| VirtualSpaceNode* _virtual_space_list; |
| // virtual space currently being used for allocations |
| VirtualSpaceNode* _current_virtual_space; |
| |
| // Is this VirtualSpaceList used for the compressed class space |
| bool _is_class; |
| |
| // Sum of reserved and committed memory in the virtual spaces |
| size_t _reserved_words; |
| size_t _committed_words; |
| |
| // Number of virtual spaces |
| size_t _virtual_space_count; |
| |
| ~VirtualSpaceList(); |
| |
| VirtualSpaceNode* virtual_space_list() const { return _virtual_space_list; } |
| |
| void set_virtual_space_list(VirtualSpaceNode* v) { |
| _virtual_space_list = v; |
| } |
| void set_current_virtual_space(VirtualSpaceNode* v) { |
| _current_virtual_space = v; |
| } |
| |
| void link_vs(VirtualSpaceNode* new_entry); |
| |
| // Get another virtual space and add it to the list. This |
| // is typically prompted by a failed attempt to allocate a chunk |
| // and is typically followed by the allocation of a chunk. |
| bool create_new_virtual_space(size_t vs_word_size); |
| |
| // Chunk up the unused committed space in the current |
| // virtual space and add the chunks to the free list. |
| void retire_current_virtual_space(); |
| |
| public: |
| VirtualSpaceList(size_t word_size); |
| VirtualSpaceList(ReservedSpace rs); |
| |
| size_t free_bytes(); |
| |
| Metachunk* get_new_chunk(size_t chunk_word_size, |
| size_t suggested_commit_granularity); |
| |
| bool expand_node_by(VirtualSpaceNode* node, |
| size_t min_words, |
| size_t preferred_words); |
| |
| bool expand_by(size_t min_words, |
| size_t preferred_words); |
| |
| VirtualSpaceNode* current_virtual_space() { |
| return _current_virtual_space; |
| } |
| |
| bool is_class() const { return _is_class; } |
| |
| bool initialization_succeeded() { return _virtual_space_list != NULL; } |
| |
| size_t reserved_words() { return _reserved_words; } |
| size_t reserved_bytes() { return reserved_words() * BytesPerWord; } |
| size_t committed_words() { return _committed_words; } |
| size_t committed_bytes() { return committed_words() * BytesPerWord; } |
| |
| void inc_reserved_words(size_t v); |
| void dec_reserved_words(size_t v); |
| void inc_committed_words(size_t v); |
| void dec_committed_words(size_t v); |
| void inc_virtual_space_count(); |
| void dec_virtual_space_count(); |
| |
| bool contains(const void* ptr); |
| |
| // Unlink empty VirtualSpaceNodes and free it. |
| void purge(ChunkManager* chunk_manager); |
| |
| void print_on(outputStream* st) const; |
| |
| class VirtualSpaceListIterator : public StackObj { |
| VirtualSpaceNode* _virtual_spaces; |
| public: |
| VirtualSpaceListIterator(VirtualSpaceNode* virtual_spaces) : |
| _virtual_spaces(virtual_spaces) {} |
| |
| bool repeat() { |
| return _virtual_spaces != NULL; |
| } |
| |
| VirtualSpaceNode* get_next() { |
| VirtualSpaceNode* result = _virtual_spaces; |
| if (_virtual_spaces != NULL) { |
| _virtual_spaces = _virtual_spaces->next(); |
| } |
| return result; |
| } |
| }; |
| }; |
| |
| class Metadebug : AllStatic { |
| // Debugging support for Metaspaces |
| static int _allocation_fail_alot_count; |
| |
| public: |
| |
| static void init_allocation_fail_alot_count(); |
| #ifdef ASSERT |
| static bool test_metadata_failure(); |
| #endif |
| }; |
| |
| int Metadebug::_allocation_fail_alot_count = 0; |
| |
| // SpaceManager - used by Metaspace to handle allocations |
| class SpaceManager : public CHeapObj<mtClass> { |
| friend class Metaspace; |
| friend class Metadebug; |
| |
| private: |
| |
| // protects allocations |
| Mutex* const _lock; |
| |
| // Type of metadata allocated. |
| Metaspace::MetadataType _mdtype; |
| |
| // List of chunks in use by this SpaceManager. Allocations |
| // are done from the current chunk. The list is used for deallocating |
| // chunks when the SpaceManager is freed. |
| Metachunk* _chunks_in_use[NumberOfInUseLists]; |
| Metachunk* _current_chunk; |
| |
| // Maximum number of small chunks to allocate to a SpaceManager |
| static uint const _small_chunk_limit; |
| |
| // Sum of all space in allocated chunks |
| size_t _allocated_blocks_words; |
| |
| // Sum of all allocated chunks |
| size_t _allocated_chunks_words; |
| size_t _allocated_chunks_count; |
| |
| // Free lists of blocks are per SpaceManager since they |
| // are assumed to be in chunks in use by the SpaceManager |
| // and all chunks in use by a SpaceManager are freed when |
| // the class loader using the SpaceManager is collected. |
| BlockFreelist* _block_freelists; |
| |
| // protects virtualspace and chunk expansions |
| static const char* _expand_lock_name; |
| static const int _expand_lock_rank; |
| static Mutex* const _expand_lock; |
| |
| private: |
| // Accessors |
| Metachunk* chunks_in_use(ChunkIndex index) const { return _chunks_in_use[index]; } |
| void set_chunks_in_use(ChunkIndex index, Metachunk* v) { |
| _chunks_in_use[index] = v; |
| } |
| |
| BlockFreelist* block_freelists() const { return _block_freelists; } |
| |
| Metaspace::MetadataType mdtype() { return _mdtype; } |
| |
| VirtualSpaceList* vs_list() const { return Metaspace::get_space_list(_mdtype); } |
| ChunkManager* chunk_manager() const { return Metaspace::get_chunk_manager(_mdtype); } |
| |
| Metachunk* current_chunk() const { return _current_chunk; } |
| void set_current_chunk(Metachunk* v) { |
| _current_chunk = v; |
| } |
| |
| Metachunk* find_current_chunk(size_t word_size); |
| |
| // Add chunk to the list of chunks in use |
| void add_chunk(Metachunk* v, bool make_current); |
| void retire_current_chunk(); |
| |
| Mutex* lock() const { return _lock; } |
| |
| const char* chunk_size_name(ChunkIndex index) const; |
| |
| protected: |
| void initialize(); |
| |
| public: |
| SpaceManager(Metaspace::MetadataType mdtype, |
| Mutex* lock); |
| ~SpaceManager(); |
| |
| enum ChunkMultiples { |
| MediumChunkMultiple = 4 |
| }; |
| |
| static size_t specialized_chunk_size(bool is_class) { return is_class ? ClassSpecializedChunk : SpecializedChunk; } |
| static size_t small_chunk_size(bool is_class) { return is_class ? ClassSmallChunk : SmallChunk; } |
| static size_t medium_chunk_size(bool is_class) { return is_class ? ClassMediumChunk : MediumChunk; } |
| |
| static size_t smallest_chunk_size(bool is_class) { return specialized_chunk_size(is_class); } |
| |
| // Accessors |
| bool is_class() const { return _mdtype == Metaspace::ClassType; } |
| |
| size_t specialized_chunk_size() const { return specialized_chunk_size(is_class()); } |
| size_t small_chunk_size() const { return small_chunk_size(is_class()); } |
| size_t medium_chunk_size() const { return medium_chunk_size(is_class()); } |
| |
| size_t smallest_chunk_size() const { return smallest_chunk_size(is_class()); } |
| |
| size_t medium_chunk_bunch() const { return medium_chunk_size() * MediumChunkMultiple; } |
| |
| size_t allocated_blocks_words() const { return _allocated_blocks_words; } |
| size_t allocated_blocks_bytes() const { return _allocated_blocks_words * BytesPerWord; } |
| size_t allocated_chunks_words() const { return _allocated_chunks_words; } |
| size_t allocated_chunks_bytes() const { return _allocated_chunks_words * BytesPerWord; } |
| size_t allocated_chunks_count() const { return _allocated_chunks_count; } |
| |
| bool is_humongous(size_t word_size) { return word_size > medium_chunk_size(); } |
| |
| static Mutex* expand_lock() { return _expand_lock; } |
| |
| // Increment the per Metaspace and global running sums for Metachunks |
| // by the given size. This is used when a Metachunk to added to |
| // the in-use list. |
| void inc_size_metrics(size_t words); |
| // Increment the per Metaspace and global running sums Metablocks by the given |
| // size. This is used when a Metablock is allocated. |
| void inc_used_metrics(size_t words); |
| // Delete the portion of the running sums for this SpaceManager. That is, |
| // the globals running sums for the Metachunks and Metablocks are |
| // decremented for all the Metachunks in-use by this SpaceManager. |
| void dec_total_from_size_metrics(); |
| |
| // Adjust the initial chunk size to match one of the fixed chunk list sizes, |
| // or return the unadjusted size if the requested size is humongous. |
| static size_t adjust_initial_chunk_size(size_t requested, bool is_class_space); |
| size_t adjust_initial_chunk_size(size_t requested) const; |
| |
| // Get the initial chunks size for this metaspace type. |
| size_t get_initial_chunk_size(Metaspace::MetaspaceType type) const; |
| |
| size_t sum_capacity_in_chunks_in_use() const; |
| size_t sum_used_in_chunks_in_use() const; |
| size_t sum_free_in_chunks_in_use() const; |
| size_t sum_waste_in_chunks_in_use() const; |
| size_t sum_waste_in_chunks_in_use(ChunkIndex index ) const; |
| |
| size_t sum_count_in_chunks_in_use(); |
| size_t sum_count_in_chunks_in_use(ChunkIndex i); |
| |
| Metachunk* get_new_chunk(size_t chunk_word_size); |
| |
| // Block allocation and deallocation. |
| // Allocates a block from the current chunk |
| MetaWord* allocate(size_t word_size); |
| // Allocates a block from a small chunk |
| MetaWord* get_small_chunk_and_allocate(size_t word_size); |
| |
| // Helper for allocations |
| MetaWord* allocate_work(size_t word_size); |
| |
| // Returns a block to the per manager freelist |
| void deallocate(MetaWord* p, size_t word_size); |
| |
| // Based on the allocation size and a minimum chunk size, |
| // returned chunk size (for expanding space for chunk allocation). |
| size_t calc_chunk_size(size_t allocation_word_size); |
| |
| // Called when an allocation from the current chunk fails. |
| // Gets a new chunk (may require getting a new virtual space), |
| // and allocates from that chunk. |
| MetaWord* grow_and_allocate(size_t word_size); |
| |
| // Notify memory usage to MemoryService. |
| void track_metaspace_memory_usage(); |
| |
| // debugging support. |
| |
| void dump(outputStream* const out) const; |
| void print_on(outputStream* st) const; |
| void locked_print_chunks_in_use_on(outputStream* st) const; |
| |
| void verify(); |
| void verify_chunk_size(Metachunk* chunk); |
| #ifdef ASSERT |
| void verify_allocated_blocks_words(); |
| #endif |
| |
| // This adjusts the size given to be greater than the minimum allocation size in |
| // words for data in metaspace. Esentially the minimum size is currently 3 words. |
| size_t get_allocation_word_size(size_t word_size) { |
| size_t byte_size = word_size * BytesPerWord; |
| |
| size_t raw_bytes_size = MAX2(byte_size, sizeof(Metablock)); |
| raw_bytes_size = align_size_up(raw_bytes_size, Metachunk::object_alignment()); |
| |
| size_t raw_word_size = raw_bytes_size / BytesPerWord; |
| assert(raw_word_size * BytesPerWord == raw_bytes_size, "Size problem"); |
| |
| return raw_word_size; |
| } |
| }; |
| |
| uint const SpaceManager::_small_chunk_limit = 4; |
| |
| const char* SpaceManager::_expand_lock_name = |
| "SpaceManager chunk allocation lock"; |
| const int SpaceManager::_expand_lock_rank = Monitor::leaf - 1; |
| Mutex* const SpaceManager::_expand_lock = |
| new Mutex(SpaceManager::_expand_lock_rank, |
| SpaceManager::_expand_lock_name, |
| Mutex::_allow_vm_block_flag, |
| Monitor::_safepoint_check_never); |
| |
| void VirtualSpaceNode::inc_container_count() { |
| assert_lock_strong(SpaceManager::expand_lock()); |
| _container_count++; |
| } |
| |
| void VirtualSpaceNode::dec_container_count() { |
| assert_lock_strong(SpaceManager::expand_lock()); |
| _container_count--; |
| } |
| |
| #ifdef ASSERT |
| void VirtualSpaceNode::verify_container_count() { |
| assert(_container_count == container_count_slow(), |
| "Inconsistency in container_count _container_count " UINTX_FORMAT |
| " container_count_slow() " UINTX_FORMAT, _container_count, container_count_slow()); |
| } |
| #endif |
| |
| // BlockFreelist methods |
| |
| BlockFreelist::BlockFreelist() : _dictionary(new BlockTreeDictionary()), _small_blocks(NULL) {} |
| |
| BlockFreelist::~BlockFreelist() { |
| delete _dictionary; |
| if (_small_blocks != NULL) { |
| delete _small_blocks; |
| } |
| } |
| |
| void BlockFreelist::return_block(MetaWord* p, size_t word_size) { |
| assert(word_size >= SmallBlocks::small_block_min_size(), "never return dark matter"); |
| |
| Metablock* free_chunk = ::new (p) Metablock(word_size); |
| if (word_size < SmallBlocks::small_block_max_size()) { |
| small_blocks()->return_block(free_chunk, word_size); |
| } else { |
| dictionary()->return_chunk(free_chunk); |
| } |
| log_trace(gc, metaspace, freelist, blocks)("returning block at " INTPTR_FORMAT " size = " |
| SIZE_FORMAT, p2i(free_chunk), word_size); |
| } |
| |
| MetaWord* BlockFreelist::get_block(size_t word_size) { |
| assert(word_size >= SmallBlocks::small_block_min_size(), "never get dark matter"); |
| |
| // Try small_blocks first. |
| if (word_size < SmallBlocks::small_block_max_size()) { |
| // Don't create small_blocks() until needed. small_blocks() allocates the small block list for |
| // this space manager. |
| MetaWord* new_block = (MetaWord*) small_blocks()->get_block(word_size); |
| if (new_block != NULL) { |
| log_trace(gc, metaspace, freelist, blocks)("getting block at " INTPTR_FORMAT " size = " SIZE_FORMAT, |
| p2i(new_block), word_size); |
| return new_block; |
| } |
| } |
| |
| if (word_size < BlockFreelist::min_dictionary_size()) { |
| // If allocation in small blocks fails, this is Dark Matter. Too small for dictionary. |
| return NULL; |
| } |
| |
| Metablock* free_block = |
| dictionary()->get_chunk(word_size, FreeBlockDictionary<Metablock>::atLeast); |
| if (free_block == NULL) { |
| return NULL; |
| } |
| |
| const size_t block_size = free_block->size(); |
| if (block_size > WasteMultiplier * word_size) { |
| return_block((MetaWord*)free_block, block_size); |
| return NULL; |
| } |
| |
| MetaWord* new_block = (MetaWord*)free_block; |
| assert(block_size >= word_size, "Incorrect size of block from freelist"); |
| const size_t unused = block_size - word_size; |
| if (unused >= SmallBlocks::small_block_min_size()) { |
| return_block(new_block + word_size, unused); |
| } |
| |
| log_trace(gc, metaspace, freelist, blocks)("getting block at " INTPTR_FORMAT " size = " SIZE_FORMAT, |
| p2i(new_block), word_size); |
| return new_block; |
| } |
| |
| void BlockFreelist::print_on(outputStream* st) const { |
| dictionary()->print_free_lists(st); |
| if (_small_blocks != NULL) { |
| _small_blocks->print_on(st); |
| } |
| } |
| |
| // VirtualSpaceNode methods |
| |
| VirtualSpaceNode::~VirtualSpaceNode() { |
| _rs.release(); |
| #ifdef ASSERT |
| size_t word_size = sizeof(*this) / BytesPerWord; |
| Copy::fill_to_words((HeapWord*) this, word_size, 0xf1f1f1f1); |
| #endif |
| } |
| |
| size_t VirtualSpaceNode::used_words_in_vs() const { |
| return pointer_delta(top(), bottom(), sizeof(MetaWord)); |
| } |
| |
| // Space committed in the VirtualSpace |
| size_t VirtualSpaceNode::capacity_words_in_vs() const { |
| return pointer_delta(end(), bottom(), sizeof(MetaWord)); |
| } |
| |
| size_t VirtualSpaceNode::free_words_in_vs() const { |
| return pointer_delta(end(), top(), sizeof(MetaWord)); |
| } |
| |
| // Allocates the chunk from the virtual space only. |
| // This interface is also used internally for debugging. Not all |
| // chunks removed here are necessarily used for allocation. |
| Metachunk* VirtualSpaceNode::take_from_committed(size_t chunk_word_size) { |
| // Bottom of the new chunk |
| MetaWord* chunk_limit = top(); |
| assert(chunk_limit != NULL, "Not safe to call this method"); |
| |
| // The virtual spaces are always expanded by the |
| // commit granularity to enforce the following condition. |
| // Without this the is_available check will not work correctly. |
| assert(_virtual_space.committed_size() == _virtual_space.actual_committed_size(), |
| "The committed memory doesn't match the expanded memory."); |
| |
| if (!is_available(chunk_word_size)) { |
| Log(gc, metaspace, freelist) log; |
| log.debug("VirtualSpaceNode::take_from_committed() not available " SIZE_FORMAT " words ", chunk_word_size); |
| // Dump some information about the virtual space that is nearly full |
| ResourceMark rm; |
| print_on(log.debug_stream()); |
| return NULL; |
| } |
| |
| // Take the space (bump top on the current virtual space). |
| inc_top(chunk_word_size); |
| |
| // Initialize the chunk |
| Metachunk* result = ::new (chunk_limit) Metachunk(chunk_word_size, this); |
| return result; |
| } |
| |
| |
| // Expand the virtual space (commit more of the reserved space) |
| bool VirtualSpaceNode::expand_by(size_t min_words, size_t preferred_words) { |
| size_t min_bytes = min_words * BytesPerWord; |
| size_t preferred_bytes = preferred_words * BytesPerWord; |
| |
| size_t uncommitted = virtual_space()->reserved_size() - virtual_space()->actual_committed_size(); |
| |
| if (uncommitted < min_bytes) { |
| return false; |
| } |
| |
| size_t commit = MIN2(preferred_bytes, uncommitted); |
| bool result = virtual_space()->expand_by(commit, false); |
| |
| assert(result, "Failed to commit memory"); |
| |
| return result; |
| } |
| |
| Metachunk* VirtualSpaceNode::get_chunk_vs(size_t chunk_word_size) { |
| assert_lock_strong(SpaceManager::expand_lock()); |
| Metachunk* result = take_from_committed(chunk_word_size); |
| if (result != NULL) { |
| inc_container_count(); |
| } |
| return result; |
| } |
| |
| bool VirtualSpaceNode::initialize() { |
| |
| if (!_rs.is_reserved()) { |
| return false; |
| } |
| |
| // These are necessary restriction to make sure that the virtual space always |
| // grows in steps of Metaspace::commit_alignment(). If both base and size are |
| // aligned only the middle alignment of the VirtualSpace is used. |
| assert_is_ptr_aligned(_rs.base(), Metaspace::commit_alignment()); |
| assert_is_size_aligned(_rs.size(), Metaspace::commit_alignment()); |
| |
| // ReservedSpaces marked as special will have the entire memory |
| // pre-committed. Setting a committed size will make sure that |
| // committed_size and actual_committed_size agrees. |
| size_t pre_committed_size = _rs.special() ? _rs.size() : 0; |
| |
| bool result = virtual_space()->initialize_with_granularity(_rs, pre_committed_size, |
| Metaspace::commit_alignment()); |
| if (result) { |
| assert(virtual_space()->committed_size() == virtual_space()->actual_committed_size(), |
| "Checking that the pre-committed memory was registered by the VirtualSpace"); |
| |
| set_top((MetaWord*)virtual_space()->low()); |
| set_reserved(MemRegion((HeapWord*)_rs.base(), |
| (HeapWord*)(_rs.base() + _rs.size()))); |
| |
| assert(reserved()->start() == (HeapWord*) _rs.base(), |
| "Reserved start was not set properly " PTR_FORMAT |
| " != " PTR_FORMAT, p2i(reserved()->start()), p2i(_rs.base())); |
| assert(reserved()->word_size() == _rs.size() / BytesPerWord, |
| "Reserved size was not set properly " SIZE_FORMAT |
| " != " SIZE_FORMAT, reserved()->word_size(), |
| _rs.size() / BytesPerWord); |
| } |
| |
| return result; |
| } |
| |
| void VirtualSpaceNode::print_on(outputStream* st) const { |
| size_t used = used_words_in_vs(); |
| size_t capacity = capacity_words_in_vs(); |
| VirtualSpace* vs = virtual_space(); |
| st->print_cr(" space @ " PTR_FORMAT " " SIZE_FORMAT "K, " SIZE_FORMAT_W(3) "%% used " |
| "[" PTR_FORMAT ", " PTR_FORMAT ", " |
| PTR_FORMAT ", " PTR_FORMAT ")", |
| p2i(vs), capacity / K, |
| capacity == 0 ? 0 : used * 100 / capacity, |
| p2i(bottom()), p2i(top()), p2i(end()), |
| p2i(vs->high_boundary())); |
| } |
| |
| #ifdef ASSERT |
| void VirtualSpaceNode::mangle() { |
| size_t word_size = capacity_words_in_vs(); |
| Copy::fill_to_words((HeapWord*) low(), word_size, 0xf1f1f1f1); |
| } |
| #endif // ASSERT |
| |
| // VirtualSpaceList methods |
| // Space allocated from the VirtualSpace |
| |
| VirtualSpaceList::~VirtualSpaceList() { |
| VirtualSpaceListIterator iter(virtual_space_list()); |
| while (iter.repeat()) { |
| VirtualSpaceNode* vsl = iter.get_next(); |
| delete vsl; |
| } |
| } |
| |
| void VirtualSpaceList::inc_reserved_words(size_t v) { |
| assert_lock_strong(SpaceManager::expand_lock()); |
| _reserved_words = _reserved_words + v; |
| } |
| void VirtualSpaceList::dec_reserved_words(size_t v) { |
| assert_lock_strong(SpaceManager::expand_lock()); |
| _reserved_words = _reserved_words - v; |
| } |
| |
| #define assert_committed_below_limit() \ |
| assert(MetaspaceAux::committed_bytes() <= MaxMetaspaceSize, \ |
| "Too much committed memory. Committed: " SIZE_FORMAT \ |
| " limit (MaxMetaspaceSize): " SIZE_FORMAT, \ |
| MetaspaceAux::committed_bytes(), MaxMetaspaceSize); |
| |
| void VirtualSpaceList::inc_committed_words(size_t v) { |
| assert_lock_strong(SpaceManager::expand_lock()); |
| _committed_words = _committed_words + v; |
| |
| assert_committed_below_limit(); |
| } |
| void VirtualSpaceList::dec_committed_words(size_t v) { |
| assert_lock_strong(SpaceManager::expand_lock()); |
| _committed_words = _committed_words - v; |
| |
| assert_committed_below_limit(); |
| } |
| |
| void VirtualSpaceList::inc_virtual_space_count() { |
| assert_lock_strong(SpaceManager::expand_lock()); |
| _virtual_space_count++; |
| } |
| void VirtualSpaceList::dec_virtual_space_count() { |
| assert_lock_strong(SpaceManager::expand_lock()); |
| _virtual_space_count--; |
| } |
| |
| void ChunkManager::remove_chunk(Metachunk* chunk) { |
| size_t word_size = chunk->word_size(); |
| ChunkIndex index = list_index(word_size); |
| if (index != HumongousIndex) { |
| free_chunks(index)->remove_chunk(chunk); |
| } else { |
| humongous_dictionary()->remove_chunk(chunk); |
| } |
| |
| // Chunk is being removed from the chunks free list. |
| dec_free_chunks_total(chunk->word_size()); |
| } |
| |
| // Walk the list of VirtualSpaceNodes and delete |
| // nodes with a 0 container_count. Remove Metachunks in |
| // the node from their respective freelists. |
| void VirtualSpaceList::purge(ChunkManager* chunk_manager) { |
| assert(SafepointSynchronize::is_at_safepoint(), "must be called at safepoint for contains to work"); |
| assert_lock_strong(SpaceManager::expand_lock()); |
| // Don't use a VirtualSpaceListIterator because this |
| // list is being changed and a straightforward use of an iterator is not safe. |
| VirtualSpaceNode* purged_vsl = NULL; |
| VirtualSpaceNode* prev_vsl = virtual_space_list(); |
| VirtualSpaceNode* next_vsl = prev_vsl; |
| while (next_vsl != NULL) { |
| VirtualSpaceNode* vsl = next_vsl; |
| DEBUG_ONLY(vsl->verify_container_count();) |
| next_vsl = vsl->next(); |
| // Don't free the current virtual space since it will likely |
| // be needed soon. |
| if (vsl->container_count() == 0 && vsl != current_virtual_space()) { |
| // Unlink it from the list |
| if (prev_vsl == vsl) { |
| // This is the case of the current node being the first node. |
| assert(vsl == virtual_space_list(), "Expected to be the first node"); |
| set_virtual_space_list(vsl->next()); |
| } else { |
| prev_vsl->set_next(vsl->next()); |
| } |
| |
| vsl->purge(chunk_manager); |
| dec_reserved_words(vsl->reserved_words()); |
| dec_committed_words(vsl->committed_words()); |
| dec_virtual_space_count(); |
| purged_vsl = vsl; |
| delete vsl; |
| } else { |
| prev_vsl = vsl; |
| } |
| } |
| #ifdef ASSERT |
| if (purged_vsl != NULL) { |
| // List should be stable enough to use an iterator here. |
| VirtualSpaceListIterator iter(virtual_space_list()); |
| while (iter.repeat()) { |
| VirtualSpaceNode* vsl = iter.get_next(); |
| assert(vsl != purged_vsl, "Purge of vsl failed"); |
| } |
| } |
| #endif |
| } |
| |
| |
| // This function looks at the mmap regions in the metaspace without locking. |
| // The chunks are added with store ordering and not deleted except for at |
| // unloading time during a safepoint. |
| bool VirtualSpaceList::contains(const void* ptr) { |
| // List should be stable enough to use an iterator here because removing virtual |
| // space nodes is only allowed at a safepoint. |
| VirtualSpaceListIterator iter(virtual_space_list()); |
| while (iter.repeat()) { |
| VirtualSpaceNode* vsn = iter.get_next(); |
| if (vsn->contains(ptr)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| void VirtualSpaceList::retire_current_virtual_space() { |
| assert_lock_strong(SpaceManager::expand_lock()); |
| |
| VirtualSpaceNode* vsn = current_virtual_space(); |
| |
| ChunkManager* cm = is_class() ? Metaspace::chunk_manager_class() : |
| Metaspace::chunk_manager_metadata(); |
| |
| vsn->retire(cm); |
| } |
| |
| void VirtualSpaceNode::retire(ChunkManager* chunk_manager) { |
| DEBUG_ONLY(verify_container_count();) |
| for (int i = (int)MediumIndex; i >= (int)ZeroIndex; --i) { |
| ChunkIndex index = (ChunkIndex)i; |
| size_t chunk_size = chunk_manager->free_chunks(index)->size(); |
| |
| while (free_words_in_vs() >= chunk_size) { |
| Metachunk* chunk = get_chunk_vs(chunk_size); |
| assert(chunk != NULL, "allocation should have been successful"); |
| |
| chunk_manager->return_chunks(index, chunk); |
| chunk_manager->inc_free_chunks_total(chunk_size); |
| } |
| DEBUG_ONLY(verify_container_count();) |
| } |
| assert(free_words_in_vs() == 0, "should be empty now"); |
| } |
| |
| VirtualSpaceList::VirtualSpaceList(size_t word_size) : |
| _is_class(false), |
| _virtual_space_list(NULL), |
| _current_virtual_space(NULL), |
| _reserved_words(0), |
| _committed_words(0), |
| _virtual_space_count(0) { |
| MutexLockerEx cl(SpaceManager::expand_lock(), |
| Mutex::_no_safepoint_check_flag); |
| create_new_virtual_space(word_size); |
| } |
| |
| VirtualSpaceList::VirtualSpaceList(ReservedSpace rs) : |
| _is_class(true), |
| _virtual_space_list(NULL), |
| _current_virtual_space(NULL), |
| _reserved_words(0), |
| _committed_words(0), |
| _virtual_space_count(0) { |
| MutexLockerEx cl(SpaceManager::expand_lock(), |
| Mutex::_no_safepoint_check_flag); |
| VirtualSpaceNode* class_entry = new VirtualSpaceNode(rs); |
| bool succeeded = class_entry->initialize(); |
| if (succeeded) { |
| link_vs(class_entry); |
| } |
| } |
| |
| size_t VirtualSpaceList::free_bytes() { |
| return virtual_space_list()->free_words_in_vs() * BytesPerWord; |
| } |
| |
| // Allocate another meta virtual space and add it to the list. |
| bool VirtualSpaceList::create_new_virtual_space(size_t vs_word_size) { |
| assert_lock_strong(SpaceManager::expand_lock()); |
| |
| if (is_class()) { |
| assert(false, "We currently don't support more than one VirtualSpace for" |
| " the compressed class space. The initialization of the" |
| " CCS uses another code path and should not hit this path."); |
| return false; |
| } |
| |
| if (vs_word_size == 0) { |
| assert(false, "vs_word_size should always be at least _reserve_alignment large."); |
| return false; |
| } |
| |
| // Reserve the space |
| size_t vs_byte_size = vs_word_size * BytesPerWord; |
| assert_is_size_aligned(vs_byte_size, Metaspace::reserve_alignment()); |
| |
| // Allocate the meta virtual space and initialize it. |
| VirtualSpaceNode* new_entry = new VirtualSpaceNode(vs_byte_size); |
| if (!new_entry->initialize()) { |
| delete new_entry; |
| return false; |
| } else { |
| assert(new_entry->reserved_words() == vs_word_size, |
| "Reserved memory size differs from requested memory size"); |
| // ensure lock-free iteration sees fully initialized node |
| OrderAccess::storestore(); |
| link_vs(new_entry); |
| return true; |
| } |
| } |
| |
| void VirtualSpaceList::link_vs(VirtualSpaceNode* new_entry) { |
| if (virtual_space_list() == NULL) { |
| set_virtual_space_list(new_entry); |
| } else { |
| current_virtual_space()->set_next(new_entry); |
| } |
| set_current_virtual_space(new_entry); |
| inc_reserved_words(new_entry->reserved_words()); |
| inc_committed_words(new_entry->committed_words()); |
| inc_virtual_space_count(); |
| #ifdef ASSERT |
| new_entry->mangle(); |
| #endif |
| if (log_is_enabled(Trace, gc, metaspace)) { |
| Log(gc, metaspace) log; |
| VirtualSpaceNode* vsl = current_virtual_space(); |
| ResourceMark rm; |
| vsl->print_on(log.trace_stream()); |
| } |
| } |
| |
| bool VirtualSpaceList::expand_node_by(VirtualSpaceNode* node, |
| size_t min_words, |
| size_t preferred_words) { |
| size_t before = node->committed_words(); |
| |
| bool result = node->expand_by(min_words, preferred_words); |
| |
| size_t after = node->committed_words(); |
| |
| // after and before can be the same if the memory was pre-committed. |
| assert(after >= before, "Inconsistency"); |
| inc_committed_words(after - before); |
| |
| return result; |
| } |
| |
| bool VirtualSpaceList::expand_by(size_t min_words, size_t preferred_words) { |
| assert_is_size_aligned(min_words, Metaspace::commit_alignment_words()); |
| assert_is_size_aligned(preferred_words, Metaspace::commit_alignment_words()); |
| assert(min_words <= preferred_words, "Invalid arguments"); |
| |
| if (!MetaspaceGC::can_expand(min_words, this->is_class())) { |
| return false; |
| } |
| |
| size_t allowed_expansion_words = MetaspaceGC::allowed_expansion(); |
| if (allowed_expansion_words < min_words) { |
| return false; |
| } |
| |
| size_t max_expansion_words = MIN2(preferred_words, allowed_expansion_words); |
| |
| // Commit more memory from the the current virtual space. |
| bool vs_expanded = expand_node_by(current_virtual_space(), |
| min_words, |
| max_expansion_words); |
| if (vs_expanded) { |
| return true; |
| } |
| retire_current_virtual_space(); |
| |
| // Get another virtual space. |
| size_t grow_vs_words = MAX2((size_t)VirtualSpaceSize, preferred_words); |
| grow_vs_words = align_size_up(grow_vs_words, Metaspace::reserve_alignment_words()); |
| |
| if (create_new_virtual_space(grow_vs_words)) { |
| if (current_virtual_space()->is_pre_committed()) { |
| // The memory was pre-committed, so we are done here. |
| assert(min_words <= current_virtual_space()->committed_words(), |
| "The new VirtualSpace was pre-committed, so it" |
| "should be large enough to fit the alloc request."); |
| return true; |
| } |
| |
| return expand_node_by(current_virtual_space(), |
| min_words, |
| max_expansion_words); |
| } |
| |
| return false; |
| } |
| |
| Metachunk* VirtualSpaceList::get_new_chunk(size_t chunk_word_size, size_t suggested_commit_granularity) { |
| |
| // Allocate a chunk out of the current virtual space. |
| Metachunk* next = current_virtual_space()->get_chunk_vs(chunk_word_size); |
| |
| if (next != NULL) { |
| return next; |
| } |
| |
| // The expand amount is currently only determined by the requested sizes |
| // and not how much committed memory is left in the current virtual space. |
| |
| size_t min_word_size = align_size_up(chunk_word_size, Metaspace::commit_alignment_words()); |
| size_t preferred_word_size = align_size_up(suggested_commit_granularity, Metaspace::commit_alignment_words()); |
| if (min_word_size >= preferred_word_size) { |
| // Can happen when humongous chunks are allocated. |
| preferred_word_size = min_word_size; |
| } |
| |
| bool expanded = expand_by(min_word_size, preferred_word_size); |
| if (expanded) { |
| next = current_virtual_space()->get_chunk_vs(chunk_word_size); |
| assert(next != NULL, "The allocation was expected to succeed after the expansion"); |
| } |
| |
| return next; |
| } |
| |
| void VirtualSpaceList::print_on(outputStream* st) const { |
| VirtualSpaceListIterator iter(virtual_space_list()); |
| while (iter.repeat()) { |
| VirtualSpaceNode* node = iter.get_next(); |
| node->print_on(st); |
| } |
| } |
| |
| // MetaspaceGC methods |
| |
| // VM_CollectForMetadataAllocation is the vm operation used to GC. |
| // Within the VM operation after the GC the attempt to allocate the metadata |
| // should succeed. If the GC did not free enough space for the metaspace |
| // allocation, the HWM is increased so that another virtualspace will be |
| // allocated for the metadata. With perm gen the increase in the perm |
| // gen had bounds, MinMetaspaceExpansion and MaxMetaspaceExpansion. The |
| // metaspace policy uses those as the small and large steps for the HWM. |
| // |
| // After the GC the compute_new_size() for MetaspaceGC is called to |
| // resize the capacity of the metaspaces. The current implementation |
| // is based on the flags MinMetaspaceFreeRatio and MaxMetaspaceFreeRatio used |
| // to resize the Java heap by some GC's. New flags can be implemented |
| // if really needed. MinMetaspaceFreeRatio is used to calculate how much |
| // free space is desirable in the metaspace capacity to decide how much |
| // to increase the HWM. MaxMetaspaceFreeRatio is used to decide how much |
| // free space is desirable in the metaspace capacity before decreasing |
| // the HWM. |
| |
| // Calculate the amount to increase the high water mark (HWM). |
| // Increase by a minimum amount (MinMetaspaceExpansion) so that |
| // another expansion is not requested too soon. If that is not |
| // enough to satisfy the allocation, increase by MaxMetaspaceExpansion. |
| // If that is still not enough, expand by the size of the allocation |
| // plus some. |
| size_t MetaspaceGC::delta_capacity_until_GC(size_t bytes) { |
| size_t min_delta = MinMetaspaceExpansion; |
| size_t max_delta = MaxMetaspaceExpansion; |
| size_t delta = align_size_up(bytes, Metaspace::commit_alignment()); |
| |
| if (delta <= min_delta) { |
| delta = min_delta; |
| } else if (delta <= max_delta) { |
| // Don't want to hit the high water mark on the next |
| // allocation so make the delta greater than just enough |
| // for this allocation. |
| delta = max_delta; |
| } else { |
| // This allocation is large but the next ones are probably not |
| // so increase by the minimum. |
| delta = delta + min_delta; |
| } |
| |
| assert_is_size_aligned(delta, Metaspace::commit_alignment()); |
| |
| return delta; |
| } |
| |
| size_t MetaspaceGC::capacity_until_GC() { |
| size_t value = (size_t)OrderAccess::load_ptr_acquire(&_capacity_until_GC); |
| assert(value >= MetaspaceSize, "Not initialized properly?"); |
| return value; |
| } |
| |
| bool MetaspaceGC::inc_capacity_until_GC(size_t v, size_t* new_cap_until_GC, size_t* old_cap_until_GC) { |
| assert_is_size_aligned(v, Metaspace::commit_alignment()); |
| |
| size_t capacity_until_GC = (size_t) _capacity_until_GC; |
| size_t new_value = capacity_until_GC + v; |
| |
| if (new_value < capacity_until_GC) { |
| // The addition wrapped around, set new_value to aligned max value. |
| new_value = align_size_down(max_uintx, Metaspace::commit_alignment()); |
| } |
| |
| intptr_t expected = (intptr_t) capacity_until_GC; |
| intptr_t actual = Atomic::cmpxchg_ptr((intptr_t) new_value, &_capacity_until_GC, expected); |
| |
| if (expected != actual) { |
| return false; |
| } |
| |
| if (new_cap_until_GC != NULL) { |
| *new_cap_until_GC = new_value; |
| } |
| if (old_cap_until_GC != NULL) { |
| *old_cap_until_GC = capacity_until_GC; |
| } |
| return true; |
| } |
| |
| size_t MetaspaceGC::dec_capacity_until_GC(size_t v) { |
| assert_is_size_aligned(v, Metaspace::commit_alignment()); |
| |
| return (size_t)Atomic::add_ptr(-(intptr_t)v, &_capacity_until_GC); |
| } |
| |
| void MetaspaceGC::initialize() { |
| // Set the high-water mark to MaxMetapaceSize during VM initializaton since |
| // we can't do a GC during initialization. |
| _capacity_until_GC = MaxMetaspaceSize; |
| } |
| |
| void MetaspaceGC::post_initialize() { |
| // Reset the high-water mark once the VM initialization is done. |
| _capacity_until_GC = MAX2(MetaspaceAux::committed_bytes(), MetaspaceSize); |
| } |
| |
| bool MetaspaceGC::can_expand(size_t word_size, bool is_class) { |
| // Check if the compressed class space is full. |
| if (is_class && Metaspace::using_class_space()) { |
| size_t class_committed = MetaspaceAux::committed_bytes(Metaspace::ClassType); |
| if (class_committed + word_size * BytesPerWord > CompressedClassSpaceSize) { |
| return false; |
| } |
| } |
| |
| // Check if the user has imposed a limit on the metaspace memory. |
| size_t committed_bytes = MetaspaceAux::committed_bytes(); |
| if (committed_bytes + word_size * BytesPerWord > MaxMetaspaceSize) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| size_t MetaspaceGC::allowed_expansion() { |
| size_t committed_bytes = MetaspaceAux::committed_bytes(); |
| size_t capacity_until_gc = capacity_until_GC(); |
| |
| assert(capacity_until_gc >= committed_bytes, |
| "capacity_until_gc: " SIZE_FORMAT " < committed_bytes: " SIZE_FORMAT, |
| capacity_until_gc, committed_bytes); |
| |
| size_t left_until_max = MaxMetaspaceSize - committed_bytes; |
| size_t left_until_GC = capacity_until_gc - committed_bytes; |
| size_t left_to_commit = MIN2(left_until_GC, left_until_max); |
| |
| return left_to_commit / BytesPerWord; |
| } |
| |
| void MetaspaceGC::compute_new_size() { |
| assert(_shrink_factor <= 100, "invalid shrink factor"); |
| uint current_shrink_factor = _shrink_factor; |
| _shrink_factor = 0; |
| |
| // Using committed_bytes() for used_after_gc is an overestimation, since the |
| // chunk free lists are included in committed_bytes() and the memory in an |
| // un-fragmented chunk free list is available for future allocations. |
| // However, if the chunk free lists becomes fragmented, then the memory may |
| // not be available for future allocations and the memory is therefore "in use". |
| // Including the chunk free lists in the definition of "in use" is therefore |
| // necessary. Not including the chunk free lists can cause capacity_until_GC to |
| // shrink below committed_bytes() and this has caused serious bugs in the past. |
| const size_t used_after_gc = MetaspaceAux::committed_bytes(); |
| const size_t capacity_until_GC = MetaspaceGC::capacity_until_GC(); |
| |
| const double minimum_free_percentage = MinMetaspaceFreeRatio / 100.0; |
| const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
| |
| const double min_tmp = used_after_gc / maximum_used_percentage; |
| size_t minimum_desired_capacity = |
| (size_t)MIN2(min_tmp, double(max_uintx)); |
| // Don't shrink less than the initial generation size |
| minimum_desired_capacity = MAX2(minimum_desired_capacity, |
| MetaspaceSize); |
| |
| log_trace(gc, metaspace)("MetaspaceGC::compute_new_size: "); |
| log_trace(gc, metaspace)(" minimum_free_percentage: %6.2f maximum_used_percentage: %6.2f", |
| minimum_free_percentage, maximum_used_percentage); |
| log_trace(gc, metaspace)(" used_after_gc : %6.1fKB", used_after_gc / (double) K); |
| |
| |
| size_t shrink_bytes = 0; |
| if (capacity_until_GC < minimum_desired_capacity) { |
| // If we have less capacity below the metaspace HWM, then |
| // increment the HWM. |
| size_t expand_bytes = minimum_desired_capacity - capacity_until_GC; |
| expand_bytes = align_size_up(expand_bytes, Metaspace::commit_alignment()); |
| // Don't expand unless it's significant |
| if (expand_bytes >= MinMetaspaceExpansion) { |
| size_t new_capacity_until_GC = 0; |
| bool succeeded = MetaspaceGC::inc_capacity_until_GC(expand_bytes, &new_capacity_until_GC); |
| assert(succeeded, "Should always succesfully increment HWM when at safepoint"); |
| |
| Metaspace::tracer()->report_gc_threshold(capacity_until_GC, |
| new_capacity_until_GC, |
| MetaspaceGCThresholdUpdater::ComputeNewSize); |
| log_trace(gc, metaspace)(" expanding: minimum_desired_capacity: %6.1fKB expand_bytes: %6.1fKB MinMetaspaceExpansion: %6.1fKB new metaspace HWM: %6.1fKB", |
| minimum_desired_capacity / (double) K, |
| expand_bytes / (double) K, |
| MinMetaspaceExpansion / (double) K, |
| new_capacity_until_GC / (double) K); |
| } |
| return; |
| } |
| |
| // No expansion, now see if we want to shrink |
| // We would never want to shrink more than this |
| assert(capacity_until_GC >= minimum_desired_capacity, |
| SIZE_FORMAT " >= " SIZE_FORMAT, |
| capacity_until_GC, minimum_desired_capacity); |
| size_t max_shrink_bytes = capacity_until_GC - minimum_desired_capacity; |
| |
| // Should shrinking be considered? |
| if (MaxMetaspaceFreeRatio < 100) { |
| const double maximum_free_percentage = MaxMetaspaceFreeRatio / 100.0; |
| const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
| const double max_tmp = used_after_gc / minimum_used_percentage; |
| size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(max_uintx)); |
| maximum_desired_capacity = MAX2(maximum_desired_capacity, |
| MetaspaceSize); |
| log_trace(gc, metaspace)(" maximum_free_percentage: %6.2f minimum_used_percentage: %6.2f", |
| maximum_free_percentage, minimum_used_percentage); |
| log_trace(gc, metaspace)(" minimum_desired_capacity: %6.1fKB maximum_desired_capacity: %6.1fKB", |
| minimum_desired_capacity / (double) K, maximum_desired_capacity / (double) K); |
| |
| assert(minimum_desired_capacity <= maximum_desired_capacity, |
| "sanity check"); |
| |
| if (capacity_until_GC > maximum_desired_capacity) { |
| // Capacity too large, compute shrinking size |
| shrink_bytes = capacity_until_GC - maximum_desired_capacity; |
| // We don't want shrink all the way back to initSize if people call |
| // System.gc(), because some programs do that between "phases" and then |
| // we'd just have to grow the heap up again for the next phase. So we |
| // damp the shrinking: 0% on the first call, 10% on the second call, 40% |
| // on the third call, and 100% by the fourth call. But if we recompute |
| // size without shrinking, it goes back to 0%. |
| shrink_bytes = shrink_bytes / 100 * current_shrink_factor; |
| |
| shrink_bytes = align_size_down(shrink_bytes, Metaspace::commit_alignment()); |
| |
| assert(shrink_bytes <= max_shrink_bytes, |
| "invalid shrink size " SIZE_FORMAT " not <= " SIZE_FORMAT, |
| shrink_bytes, max_shrink_bytes); |
| if (current_shrink_factor == 0) { |
| _shrink_factor = 10; |
| } else { |
| _shrink_factor = MIN2(current_shrink_factor * 4, (uint) 100); |
| } |
| log_trace(gc, metaspace)(" shrinking: initThreshold: %.1fK maximum_desired_capacity: %.1fK", |
| MetaspaceSize / (double) K, maximum_desired_capacity / (double) K); |
| log_trace(gc, metaspace)(" shrink_bytes: %.1fK current_shrink_factor: %d new shrink factor: %d MinMetaspaceExpansion: %.1fK", |
| shrink_bytes / (double) K, current_shrink_factor, _shrink_factor, MinMetaspaceExpansion / (double) K); |
| } |
| } |
| |
| // Don't shrink unless it's significant |
| if (shrink_bytes >= MinMetaspaceExpansion && |
| ((capacity_until_GC - shrink_bytes) >= MetaspaceSize)) { |
| size_t new_capacity_until_GC = MetaspaceGC::dec_capacity_until_GC(shrink_bytes); |
| Metaspace::tracer()->report_gc_threshold(capacity_until_GC, |
| new_capacity_until_GC, |
| MetaspaceGCThresholdUpdater::ComputeNewSize); |
| } |
| } |
| |
| // Metadebug methods |
| |
| void Metadebug::init_allocation_fail_alot_count() { |
| if (MetadataAllocationFailALot) { |
| _allocation_fail_alot_count = |
| 1+(long)((double)MetadataAllocationFailALotInterval*os::random()/(max_jint+1.0)); |
| } |
| } |
| |
| #ifdef ASSERT |
| bool Metadebug::test_metadata_failure() { |
| if (MetadataAllocationFailALot && |
| Threads::is_vm_complete()) { |
| if (_allocation_fail_alot_count > 0) { |
| _allocation_fail_alot_count--; |
| } else { |
| log_trace(gc, metaspace, freelist)("Metadata allocation failing for MetadataAllocationFailALot"); |
| init_allocation_fail_alot_count(); |
| return true; |
| } |
| } |
| return false; |
| } |
| #endif |
| |
| // ChunkManager methods |
| |
| size_t ChunkManager::free_chunks_total_words() { |
| return _free_chunks_total; |
| } |
| |
| size_t ChunkManager::free_chunks_total_bytes() { |
| return free_chunks_total_words() * BytesPerWord; |
| } |
| |
| size_t ChunkManager::free_chunks_count() { |
| #ifdef ASSERT |
| if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) { |
| MutexLockerEx cl(SpaceManager::expand_lock(), |
| Mutex::_no_safepoint_check_flag); |
| // This lock is only needed in debug because the verification |
| // of the _free_chunks_totals walks the list of free chunks |
| slow_locked_verify_free_chunks_count(); |
| } |
| #endif |
| return _free_chunks_count; |
| } |
| |
| void ChunkManager::locked_verify_free_chunks_total() { |
| assert_lock_strong(SpaceManager::expand_lock()); |
| assert(sum_free_chunks() == _free_chunks_total, |
| "_free_chunks_total " SIZE_FORMAT " is not the" |
| " same as sum " SIZE_FORMAT, _free_chunks_total, |
| sum_free_chunks()); |
| } |
| |
| void ChunkManager::verify_free_chunks_total() { |
| MutexLockerEx cl(SpaceManager::expand_lock(), |
| Mutex::_no_safepoint_check_flag); |
| locked_verify_free_chunks_total(); |
| } |
| |
| void ChunkManager::locked_verify_free_chunks_count() { |
| assert_lock_strong(SpaceManager::expand_lock()); |
| assert(sum_free_chunks_count() == _free_chunks_count, |
| "_free_chunks_count " SIZE_FORMAT " is not the" |
| " same as sum " SIZE_FORMAT, _free_chunks_count, |
| sum_free_chunks_count()); |
| } |
| |
| void ChunkManager::verify_free_chunks_count() { |
| #ifdef ASSERT |
| MutexLockerEx cl(SpaceManager::expand_lock(), |
| Mutex::_no_safepoint_check_flag); |
| locked_verify_free_chunks_count(); |
| #endif |
| } |
| |
| void ChunkManager::verify() { |
| MutexLockerEx cl(SpaceManager::expand_lock(), |
| Mutex::_no_safepoint_check_flag); |
| locked_verify(); |
| } |
| |
| void ChunkManager::locked_verify() { |
| locked_verify_free_chunks_count(); |
| locked_verify_free_chunks_total(); |
| } |
| |
| void ChunkManager::locked_print_free_chunks(outputStream* st) { |
| assert_lock_strong(SpaceManager::expand_lock()); |
| st->print_cr("Free chunk total " SIZE_FORMAT " count " SIZE_FORMAT, |
| _free_chunks_total, _free_chunks_count); |
| } |
| |
| void ChunkManager::locked_print_sum_free_chunks(outputStream* st) { |
| assert_lock_strong(SpaceManager::expand_lock()); |
| st->print_cr("Sum free chunk total " SIZE_FORMAT " count " SIZE_FORMAT, |
| sum_free_chunks(), sum_free_chunks_count()); |
| } |
| |
| ChunkList* ChunkManager::free_chunks(ChunkIndex index) { |
| assert(index == SpecializedIndex || index == SmallIndex || index == MediumIndex, |
| "Bad index: %d", (int)index); |
| |
| return &_free_chunks[index]; |
| } |
| |
| // These methods that sum the free chunk lists are used in printing |
| // methods that are used in product builds. |
| size_t ChunkManager::sum_free_chunks() { |
| assert_lock_strong(SpaceManager::expand_lock()); |
| size_t result = 0; |
| for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) { |
| ChunkList* list = free_chunks(i); |
| |
| if (list == NULL) { |
| continue; |
| } |
| |
| result = result + list->count() * list->size(); |
| } |
| result = result + humongous_dictionary()->total_size(); |
| return result; |
| } |
| |
| size_t ChunkManager::sum_free_chunks_count() { |
| assert_lock_strong(SpaceManager::expand_lock()); |
| size_t count = 0; |
| for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) { |
| ChunkList* list = free_chunks(i); |
| if (list == NULL) { |
| continue; |
| } |
| count = count + list->count(); |
| } |
| count = count + humongous_dictionary()->total_free_blocks(); |
| return count; |
| } |
| |
| ChunkList* ChunkManager::find_free_chunks_list(size_t word_size) { |
| ChunkIndex index = list_index(word_size); |
| assert(index < HumongousIndex, "No humongous list"); |
| return free_chunks(index); |
| } |
| |
| Metachunk* ChunkManager::free_chunks_get(size_t word_size) { |
| assert_lock_strong(SpaceManager::expand_lock()); |
| |
| slow_locked_verify(); |
| |
| Metachunk* chunk = NULL; |
| if (list_index(word_size) != HumongousIndex) { |
| ChunkList* free_list = find_free_chunks_list(word_size); |
| assert(free_list != NULL, "Sanity check"); |
| |
| chunk = free_list->head(); |
| |
| if (chunk == NULL) { |
| return NULL; |
| } |
| |
| // Remove the chunk as the head of the list. |
| free_list->remove_chunk(chunk); |
| |
| log_trace(gc, metaspace, freelist)("ChunkManager::free_chunks_get: free_list " PTR_FORMAT " head " PTR_FORMAT " size " SIZE_FORMAT, |
| p2i(free_list), p2i(chunk), chunk->word_size()); |
| } else { |
| chunk = humongous_dictionary()->get_chunk( |
| word_size, |
| FreeBlockDictionary<Metachunk>::atLeast); |
| |
| if (chunk == NULL) { |
| return NULL; |
| } |
| |
| log_debug(gc, metaspace, alloc)("Free list allocate humongous chunk size " SIZE_FORMAT " for requested size " SIZE_FORMAT " waste " SIZE_FORMAT, |
| chunk->word_size(), word_size, chunk->word_size() - word_size); |
| } |
| |
| // Chunk is being removed from the chunks free list. |
| dec_free_chunks_total(chunk->word_size()); |
| |
| // Remove it from the links to this freelist |
| chunk->set_next(NULL); |
| chunk->set_prev(NULL); |
| #ifdef ASSERT |
| // Chunk is no longer on any freelist. Setting to false make container_count_slow() |
| // work. |
| chunk->set_is_tagged_free(false); |
| #endif |
| chunk->container()->inc_container_count(); |
| |
| slow_locked_verify(); |
| return chunk; |
| } |
| |
| Metachunk* ChunkManager::chunk_freelist_allocate(size_t word_size) { |
| assert_lock_strong(SpaceManager::expand_lock()); |
| slow_locked_verify(); |
| |
| // Take from the beginning of the list |
| Metachunk* chunk = free_chunks_get(word_size); |
| if (chunk == NULL) { |
| return NULL; |
| } |
| |
| assert((word_size <= chunk->word_size()) || |
| (list_index(chunk->word_size()) == HumongousIndex), |
| "Non-humongous variable sized chunk"); |
| Log(gc, metaspace, freelist) log; |
| if (log.is_debug()) { |
| size_t list_count; |
| if (list_index(word_size) < HumongousIndex) { |
| ChunkList* list = find_free_chunks_list(word_size); |
| list_count = list->count(); |
| } else { |
| list_count = humongous_dictionary()->total_count(); |
| } |
| log.debug("ChunkManager::chunk_freelist_allocate: " PTR_FORMAT " chunk " PTR_FORMAT " size " SIZE_FORMAT " count " SIZE_FORMAT " ", |
| p2i(this), p2i(chunk), chunk->word_size(), list_count); |
| ResourceMark rm; |
| locked_print_free_chunks(log.debug_stream()); |
| } |
| |
| return chunk; |
| } |
| |
| void ChunkManager::print_on(outputStream* out) const { |
| const_cast<ChunkManager *>(this)->humongous_dictionary()->report_statistics(out); |
| } |
| |
| // SpaceManager methods |
| |
| size_t SpaceManager::adjust_initial_chunk_size(size_t requested, bool is_class_space) { |
| size_t chunk_sizes[] = { |
| specialized_chunk_size(is_class_space), |
| small_chunk_size(is_class_space), |
| medium_chunk_size(is_class_space) |
| }; |
| |
| // Adjust up to one of the fixed chunk sizes ... |
| for (size_t i = 0; i < ARRAY_SIZE(chunk_sizes); i++) { |
| if (requested <= chunk_sizes[i]) { |
| return chunk_sizes[i]; |
| } |
| } |
| |
| // ... or return the size as a humongous chunk. |
| return requested; |
| } |
| |
| size_t SpaceManager::adjust_initial_chunk_size(size_t requested) const { |
| return adjust_initial_chunk_size(requested, is_class()); |
| } |
| |
| size_t SpaceManager::get_initial_chunk_size(Metaspace::MetaspaceType type) const { |
| size_t requested; |
| |
| if (is_class()) { |
| switch (type) { |
| case Metaspace::BootMetaspaceType: requested = Metaspace::first_class_chunk_word_size(); break; |
| case Metaspace::ROMetaspaceType: requested = ClassSpecializedChunk; break; |
| case Metaspace::ReadWriteMetaspaceType: requested = ClassSpecializedChunk; break; |
| case Metaspace::AnonymousMetaspaceType: requested = ClassSpecializedChunk; break; |
| case Metaspace::ReflectionMetaspaceType: requested = ClassSpecializedChunk; break; |
| default: requested = ClassSmallChunk; break; |
| } |
| } else { |
| switch (type) { |
| case Metaspace::BootMetaspaceType: requested = Metaspace::first_chunk_word_size(); break; |
| case Metaspace::ROMetaspaceType: requested = SharedReadOnlySize / wordSize; break; |
| case Metaspace::ReadWriteMetaspaceType: requested = SharedReadWriteSize / wordSize; break; |
| case Metaspace::AnonymousMetaspaceType: requested = SpecializedChunk; break; |
| case Metaspace::ReflectionMetaspaceType: requested = SpecializedChunk; break; |
| default: requested = SmallChunk; break; |
| } |
| } |
| |
| // Adjust to one of the fixed chunk sizes (unless humongous) |
| const size_t adjusted = adjust_initial_chunk_size(requested); |
| |
| assert(adjusted != 0, "Incorrect initial chunk size. Requested: " |
| SIZE_FORMAT " adjusted: " SIZE_FORMAT, requested, adjusted); |
| |
| return adjusted; |
| } |
| |
| size_t SpaceManager::sum_free_in_chunks_in_use() const { |
| MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
| size_t free = 0; |
| for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
| Metachunk* chunk = chunks_in_use(i); |
| while (chunk != NULL) { |
| free += chunk->free_word_size(); |
| chunk = chunk->next(); |
| } |
| } |
| return free; |
| } |
| |
| size_t SpaceManager::sum_waste_in_chunks_in_use() const { |
| MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
| size_t result = 0; |
| for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
| result += sum_waste_in_chunks_in_use(i); |
| } |
| |
| return result; |
| } |
| |
| size_t SpaceManager::sum_waste_in_chunks_in_use(ChunkIndex index) const { |
| size_t result = 0; |
| Metachunk* chunk = chunks_in_use(index); |
| // Count the free space in all the chunk but not the |
| // current chunk from which allocations are still being done. |
| while (chunk != NULL) { |
| if (chunk != current_chunk()) { |
| result += chunk->free_word_size(); |
| } |
| chunk = chunk->next(); |
| } |
| return result; |
| } |
| |
| size_t SpaceManager::sum_capacity_in_chunks_in_use() const { |
| // For CMS use "allocated_chunks_words()" which does not need the |
| // Metaspace lock. For the other collectors sum over the |
| // lists. Use both methods as a check that "allocated_chunks_words()" |
| // is correct. That is, sum_capacity_in_chunks() is too expensive |
| // to use in the product and allocated_chunks_words() should be used |
| // but allow for checking that allocated_chunks_words() returns the same |
| // value as sum_capacity_in_chunks_in_use() which is the definitive |
| // answer. |
| if (UseConcMarkSweepGC) { |
| return allocated_chunks_words(); |
| } else { |
| MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
| size_t sum = 0; |
| for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
| Metachunk* chunk = chunks_in_use(i); |
| while (chunk != NULL) { |
| sum += chunk->word_size(); |
| chunk = chunk->next(); |
| } |
| } |
| return sum; |
| } |
| } |
| |
| size_t SpaceManager::sum_count_in_chunks_in_use() { |
| size_t count = 0; |
| for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
| count = count + sum_count_in_chunks_in_use(i); |
| } |
| |
| return count; |
| } |
| |
| size_t SpaceManager::sum_count_in_chunks_in_use(ChunkIndex i) { |
| size_t count = 0; |
| Metachunk* chunk = chunks_in_use(i); |
| while (chunk != NULL) { |
| count++; |
| chunk = chunk->next(); |
| } |
| return count; |
| } |
| |
| |
| size_t SpaceManager::sum_used_in_chunks_in_use() const { |
| MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
| size_t used = 0; |
| for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
| Metachunk* chunk = chunks_in_use(i); |
| while (chunk != NULL) { |
| used += chunk->used_word_size(); |
| chunk = chunk->next(); |
| } |
| } |
| return used; |
| } |
| |
| void SpaceManager::locked_print_chunks_in_use_on(outputStream* st) const { |
| |
| for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
| Metachunk* chunk = chunks_in_use(i); |
| st->print("SpaceManager: %s " PTR_FORMAT, |
| chunk_size_name(i), p2i(chunk)); |
| if (chunk != NULL) { |
| st->print_cr(" free " SIZE_FORMAT, |
| chunk->free_word_size()); |
| } else { |
| st->cr(); |
| } |
| } |
| |
| chunk_manager()->locked_print_free_chunks(st); |
| chunk_manager()->locked_print_sum_free_chunks(st); |
| } |
| |
| size_t SpaceManager::calc_chunk_size(size_t word_size) { |
| |
| // Decide between a small chunk and a medium chunk. Up to |
| // _small_chunk_limit small chunks can be allocated. |
| // After that a medium chunk is preferred. |
| size_t chunk_word_size; |
| if (chunks_in_use(MediumIndex) == NULL && |
| sum_count_in_chunks_in_use(SmallIndex) < _small_chunk_limit) { |
| chunk_word_size = (size_t) small_chunk_size(); |
| if (word_size + Metachunk::overhead() > small_chunk_size()) { |
| chunk_word_size = medium_chunk_size(); |
| } |
| } else { |
| chunk_word_size = medium_chunk_size(); |
| } |
| |
| // Might still need a humongous chunk. Enforce |
| // humongous allocations sizes to be aligned up to |
| // the smallest chunk size. |
| size_t if_humongous_sized_chunk = |
| align_size_up(word_size + Metachunk::overhead(), |
| smallest_chunk_size()); |
| chunk_word_size = |
| MAX2((size_t) chunk_word_size, if_humongous_sized_chunk); |
| |
| assert(!SpaceManager::is_humongous(word_size) || |
| chunk_word_size == if_humongous_sized_chunk, |
| "Size calculation is wrong, word_size " SIZE_FORMAT |
| " chunk_word_size " SIZE_FORMAT, |
| word_size, chunk_word_size); |
| Log(gc, metaspace, alloc) log; |
| if (log.is_debug() && SpaceManager::is_humongous(word_size)) { |
| log.debug("Metadata humongous allocation:"); |
| log.debug(" word_size " PTR_FORMAT, word_size); |
| log.debug(" chunk_word_size " PTR_FORMAT, chunk_word_size); |
| log.debug(" chunk overhead " PTR_FORMAT, Metachunk::overhead()); |
| } |
| return chunk_word_size; |
| } |
| |
| void SpaceManager::track_metaspace_memory_usage() { |
| if (is_init_completed()) { |
| if (is_class()) { |
| MemoryService::track_compressed_class_memory_usage(); |
| } |
| MemoryService::track_metaspace_memory_usage(); |
| } |
| } |
| |
| MetaWord* SpaceManager::grow_and_allocate(size_t word_size) { |
| assert(vs_list()->current_virtual_space() != NULL, |
| "Should have been set"); |
| assert(current_chunk() == NULL || |
| current_chunk()->allocate(word_size) == NULL, |
| "Don't need to expand"); |
| MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag); |
| |
| if (log_is_enabled(Trace, gc, metaspace, freelist)) { |
| size_t words_left = 0; |
| size_t words_used = 0; |
| if (current_chunk() != NULL) { |
| words_left = current_chunk()->free_word_size(); |
| words_used = current_chunk()->used_word_size(); |
| } |
| log_trace(gc, metaspace, freelist)("SpaceManager::grow_and_allocate for " SIZE_FORMAT " words " SIZE_FORMAT " words used " SIZE_FORMAT " words left", |
| word_size, words_used, words_left); |
| } |
| |
| // Get another chunk |
| size_t chunk_word_size = calc_chunk_size(word_size); |
| Metachunk* next = get_new_chunk(chunk_word_size); |
| |
| MetaWord* mem = NULL; |
| |
| // If a chunk was available, add it to the in-use chunk list |
| // and do an allocation from it. |
| if (next != NULL) { |
| // Add to this manager's list of chunks in use. |
| add_chunk(next, false); |
| mem = next->allocate(word_size); |
| } |
| |
| // Track metaspace memory usage statistic. |
| track_metaspace_memory_usage(); |
| |
| return mem; |
| } |
| |
| void SpaceManager::print_on(outputStream* st) const { |
| |
| for (ChunkIndex i = ZeroIndex; |
| i < NumberOfInUseLists ; |
| i = next_chunk_index(i) ) { |
| st->print_cr(" chunks_in_use " PTR_FORMAT " chunk size " SIZE_FORMAT, |
| p2i(chunks_in_use(i)), |
| chunks_in_use(i) == NULL ? 0 : chunks_in_use(i)->word_size()); |
| } |
| st->print_cr(" waste: Small " SIZE_FORMAT " Medium " SIZE_FORMAT |
| " Humongous " SIZE_FORMAT, |
| sum_waste_in_chunks_in_use(SmallIndex), |
| sum_waste_in_chunks_in_use(MediumIndex), |
| sum_waste_in_chunks_in_use(HumongousIndex)); |
| // block free lists |
| if (block_freelists() != NULL) { |
| st->print_cr("total in block free lists " SIZE_FORMAT, |
| block_freelists()->total_size()); |
| } |
| } |
| |
| SpaceManager::SpaceManager(Metaspace::MetadataType mdtype, |
| Mutex* lock) : |
| _mdtype(mdtype), |
| _allocated_blocks_words(0), |
| _allocated_chunks_words(0), |
| _allocated_chunks_count(0), |
| _block_freelists(NULL), |
| _lock(lock) |
| { |
| initialize(); |
| } |
| |
| void SpaceManager::inc_size_metrics(size_t words) { |
| assert_lock_strong(SpaceManager::expand_lock()); |
| // Total of allocated Metachunks and allocated Metachunks count |
| // for each SpaceManager |
| _allocated_chunks_words = _allocated_chunks_words + words; |
| _allocated_chunks_count++; |
| // Global total of capacity in allocated Metachunks |
| MetaspaceAux::inc_capacity(mdtype(), words); |
| // Global total of allocated Metablocks. |
| // used_words_slow() includes the overhead in each |
| // Metachunk so include it in the used when the |
| // Metachunk is first added (so only added once per |
| // Metachunk). |
| MetaspaceAux::inc_used(mdtype(), Metachunk::overhead()); |
| } |
| |
| void SpaceManager::inc_used_metrics(size_t words) { |
| // Add to the per SpaceManager total |
| Atomic::add_ptr(words, &_allocated_blocks_words); |
| // Add to the global total |
| MetaspaceAux::inc_used(mdtype(), words); |
| } |
| |
| void SpaceManager::dec_total_from_size_metrics() { |
| MetaspaceAux::dec_capacity(mdtype(), allocated_chunks_words()); |
| MetaspaceAux::dec_used(mdtype(), allocated_blocks_words()); |
| // Also deduct the overhead per Metachunk |
| MetaspaceAux::dec_used(mdtype(), allocated_chunks_count() * Metachunk::overhead()); |
| } |
| |
| void SpaceManager::initialize() { |
| Metadebug::init_allocation_fail_alot_count(); |
| for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
| _chunks_in_use[i] = NULL; |
| } |
| _current_chunk = NULL; |
| log_trace(gc, metaspace, freelist)("SpaceManager(): " PTR_FORMAT, p2i(this)); |
| } |
| |
| void ChunkManager::return_chunks(ChunkIndex index, Metachunk* chunks) { |
| if (chunks == NULL) { |
| return; |
| } |
| ChunkList* list = free_chunks(index); |
| assert(list->size() == chunks->word_size(), "Mismatch in chunk sizes"); |
| assert_lock_strong(SpaceManager::expand_lock()); |
| Metachunk* cur = chunks; |
| |
| // This returns chunks one at a time. If a new |
| // class List can be created that is a base class |
| // of FreeList then something like FreeList::prepend() |
| // can be used in place of this loop |
| while (cur != NULL) { |
| assert(cur->container() != NULL, "Container should have been set"); |
| cur->container()->dec_container_count(); |
| // Capture the next link before it is changed |
| // by the call to return_chunk_at_head(); |
| Metachunk* next = cur->next(); |
| DEBUG_ONLY(cur->set_is_tagged_free(true);) |
| NOT_PRODUCT(cur->mangle(badMetaWordVal);) |
| list->return_chunk_at_head(cur); |
| cur = next; |
| } |
| } |
| |
| SpaceManager::~SpaceManager() { |
| // This call this->_lock which can't be done while holding expand_lock() |
| assert(sum_capacity_in_chunks_in_use() == allocated_chunks_words(), |
| "sum_capacity_in_chunks_in_use() " SIZE_FORMAT |
| " allocated_chunks_words() " SIZE_FORMAT, |
| sum_capacity_in_chunks_in_use(), allocated_chunks_words()); |
| |
| MutexLockerEx fcl(SpaceManager::expand_lock(), |
| Mutex::_no_safepoint_check_flag); |
| |
| chunk_manager()->slow_locked_verify(); |
| |
| dec_total_from_size_metrics(); |
| |
| Log(gc, metaspace, freelist) log; |
| if (log.is_trace()) { |
| log.trace("~SpaceManager(): " PTR_FORMAT, p2i(this)); |
| ResourceMark rm; |
| locked_print_chunks_in_use_on(log.trace_stream()); |
| if (block_freelists() != NULL) { |
| block_freelists()->print_on(log.trace_stream()); |
| } |
| } |
| |
| // Have to update before the chunks_in_use lists are emptied |
| // below. |
| chunk_manager()->inc_free_chunks_total(allocated_chunks_words(), |
| sum_count_in_chunks_in_use()); |
| |
| // Add all the chunks in use by this space manager |
| // to the global list of free chunks. |
| |
| // Follow each list of chunks-in-use and add them to the |
| // free lists. Each list is NULL terminated. |
| |
| for (ChunkIndex i = ZeroIndex; i < HumongousIndex; i = next_chunk_index(i)) { |
| log.trace("returned " SIZE_FORMAT " %s chunks to freelist", sum_count_in_chunks_in_use(i), chunk_size_name(i)); |
| Metachunk* chunks = chunks_in_use(i); |
| chunk_manager()->return_chunks(i, chunks); |
| set_chunks_in_use(i, NULL); |
| log.trace("updated freelist count " SSIZE_FORMAT " %s", chunk_manager()->free_chunks(i)->count(), chunk_size_name(i)); |
| assert(i != HumongousIndex, "Humongous chunks are handled explicitly later"); |
| } |
| |
| // The medium chunk case may be optimized by passing the head and |
| // tail of the medium chunk list to add_at_head(). The tail is often |
| // the current chunk but there are probably exceptions. |
| |
| // Humongous chunks |
| log.trace("returned " SIZE_FORMAT " %s humongous chunks to dictionary", |
| sum_count_in_chunks_in_use(HumongousIndex), chunk_size_name(HumongousIndex)); |
| log.trace("Humongous chunk dictionary: "); |
| // Humongous chunks are never the current chunk. |
| Metachunk* humongous_chunks = chunks_in_use(HumongousIndex); |
| |
| while (humongous_chunks != NULL) { |
| DEBUG_ONLY(humongous_chunks->set_is_tagged_free(true);) |
| NOT_PRODUCT(humongous_chunks->mangle(badMetaWordVal);) |
| log.trace(PTR_FORMAT " (" SIZE_FORMAT ") ", p2i(humongous_chunks), humongous_chunks->word_size()); |
| assert(humongous_chunks->word_size() == (size_t) |
| align_size_up(humongous_chunks->word_size(), |
| smallest_chunk_size()), |
| "Humongous chunk size is wrong: word size " SIZE_FORMAT |
| " granularity " SIZE_FORMAT, |
| humongous_chunks->word_size(), smallest_chunk_size()); |
| Metachunk* next_humongous_chunks = humongous_chunks->next(); |
| humongous_chunks->container()->dec_container_count(); |
| chunk_manager()->humongous_dictionary()->return_chunk(humongous_chunks); |
| humongous_chunks = next_humongous_chunks; |
| } |
| log.trace("updated dictionary count " SIZE_FORMAT " %s", chunk_manager()->humongous_dictionary()->total_count(), chunk_size_name(HumongousIndex)); |
| chunk_manager()->slow_locked_verify(); |
| |
| if (_block_freelists != NULL) { |
| delete _block_freelists; |
| } |
| } |
| |
| const char* SpaceManager::chunk_size_name(ChunkIndex index) const { |
| switch (index) { |
| case SpecializedIndex: |
| return "Specialized"; |
| case SmallIndex: |
| return "Small"; |
| case MediumIndex: |
| return "Medium"; |
| case HumongousIndex: |
| return "Humongous"; |
| default: |
| return NULL; |
| } |
| } |
| |
| ChunkIndex ChunkManager::list_index(size_t size) { |
| if (free_chunks(SpecializedIndex)->size() == size) { |
| return SpecializedIndex; |
| } |
| if (free_chunks(SmallIndex)->size() == size) { |
| return SmallIndex; |
| } |
| if (free_chunks(MediumIndex)->size() == size) { |
| return MediumIndex; |
| } |
| |
| assert(size > free_chunks(MediumIndex)->size(), "Not a humongous chunk"); |
| return HumongousIndex; |
| } |
| |
| void SpaceManager::deallocate(MetaWord* p, size_t word_size) { |
| assert_lock_strong(_lock); |
| // Allocations and deallocations are in raw_word_size |
| size_t raw_word_size = get_allocation_word_size(word_size); |
| // Lazily create a block_freelist |
| if (block_freelists() == NULL) { |
| _block_freelists = new BlockFreelist(); |
| } |
| block_freelists()->return_block(p, raw_word_size); |
| } |
| |
| // Adds a chunk to the list of chunks in use. |
| void SpaceManager::add_chunk(Metachunk* new_chunk, bool make_current) { |
| |
| assert(new_chunk != NULL, "Should not be NULL"); |
| assert(new_chunk->next() == NULL, "Should not be on a list"); |
| |
| new_chunk->reset_empty(); |
| |
| // Find the correct list and and set the current |
| // chunk for that list. |
| ChunkIndex index = chunk_manager()->list_index(new_chunk->word_size()); |
| |
| if (index != HumongousIndex) { |
| retire_current_chunk(); |
| set_current_chunk(new_chunk); |
| new_chunk->set_next(chunks_in_use(index)); |
| set_chunks_in_use(index, new_chunk); |
| } else { |
| // For null class loader data and DumpSharedSpaces, the first chunk isn't |
| // small, so small will be null. Link this first chunk as the current |
| // chunk. |
| if (make_current) { |
| // Set as the current chunk but otherwise treat as a humongous chunk. |
| set_current_chunk(new_chunk); |
| } |
| // Link at head. The _current_chunk only points to a humongous chunk for |
| // the null class loader metaspace (class and data virtual space managers) |
| // any humongous chunks so will not point to the tail |
| // of the humongous chunks list. |
| new_chunk->set_next(chunks_in_use(HumongousIndex)); |
| set_chunks_in_use(HumongousIndex, new_chunk); |
| |
| assert(new_chunk->word_size() > medium_chunk_size(), "List inconsistency"); |
| } |
| |
| // Add to the running sum of capacity |
| inc_size_metrics(new_chunk->word_size()); |
| |
| assert(new_chunk->is_empty(), "Not ready for reuse"); |
| Log(gc, metaspace, freelist) log; |
| if (log.is_trace()) { |
| log.trace("SpaceManager::add_chunk: " SIZE_FORMAT ") ", sum_count_in_chunks_in_use()); |
| ResourceMark rm; |
| outputStream* out = log.trace_stream(); |
| new_chunk->print_on(out); |
| chunk_manager()->locked_print_free_chunks(out); |
| } |
| } |
| |
| void SpaceManager::retire_current_chunk() { |
| if (current_chunk() != NULL) { |
| size_t remaining_words = current_chunk()->free_word_size(); |
| if (remaining_words >= BlockFreelist::min_dictionary_size()) { |
| MetaWord* ptr = current_chunk()->allocate(remaining_words); |
| deallocate(ptr, remaining_words); |
| inc_used_metrics(remaining_words); |
| } |
| } |
| } |
| |
| Metachunk* SpaceManager::get_new_chunk(size_t chunk_word_size) { |
| // Get a chunk from the chunk freelist |
| Metachunk* next = chunk_manager()->chunk_freelist_allocate(chunk_word_size); |
| |
| if (next == NULL) { |
| next = vs_list()->get_new_chunk(chunk_word_size, |
| medium_chunk_bunch()); |
| } |
| |
| Log(gc, metaspace, alloc) log; |
| if (log.is_debug() && next != NULL && |
| SpaceManager::is_humongous(next->word_size())) { |
| log.debug(" new humongous chunk word size " PTR_FORMAT, next->word_size()); |
| } |
| |
| return next; |
| } |
| |
| /* |
| * The policy is to allocate up to _small_chunk_limit small chunks |
| * after which only medium chunks are allocated. This is done to |
| * reduce fragmentation. In some cases, this can result in a lot |
| * of small chunks being allocated to the point where it's not |
| * possible to expand. If this happens, there may be no medium chunks |
| * available and OOME would be thrown. Instead of doing that, |
| * if the allocation request size fits in a small chunk, an attempt |
| * will be made to allocate a small chunk. |
| */ |
| MetaWord* SpaceManager::get_small_chunk_and_allocate(size_t word_size) { |
| size_t raw_word_size = get_allocation_word_size(word_size); |
| |
| if (raw_word_size + Metachunk::overhead() > small_chunk_size()) { |
| return NULL; |
| } |
| |
| MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
| MutexLockerEx cl1(expand_lock(), Mutex::_no_safepoint_check_flag); |
| |
| Metachunk* chunk = chunk_manager()->chunk_freelist_allocate(small_chunk_size()); |
| |
| MetaWord* mem = NULL; |
| |
| if (chunk != NULL) { |
| // Add chunk to the in-use chunk list and do an allocation from it. |
| // Add to this manager's list of chunks in use. |
| add_chunk(chunk, false); |
| mem = chunk->allocate(raw_word_size); |
| |
| inc_used_metrics(raw_word_size); |
| |
| // Track metaspace memory usage statistic. |
| track_metaspace_memory_usage(); |
| } |
| |
| return mem; |
| } |
| |
| MetaWord* SpaceManager::allocate(size_t word_size) { |
| MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
| size_t raw_word_size = get_allocation_word_size(word_size); |
| BlockFreelist* fl = block_freelists(); |
| MetaWord* p = NULL; |
| // Allocation from the dictionary is expensive in the sense that |
| // the dictionary has to be searched for a size. Don't allocate |
| // from the dictionary until it starts to get fat. Is this |
| // a reasonable policy? Maybe an skinny dictionary is fast enough |
| // for allocations. Do some profiling. JJJ |
| if (fl != NULL && fl->total_size() > allocation_from_dictionary_limit) { |
| p = fl->get_block(raw_word_size); |
| } |
| if (p == NULL) { |
| p = allocate_work(raw_word_size); |
| } |
| |
| return p; |
| } |
| |
| // Returns the address of spaced allocated for "word_size". |
| // This methods does not know about blocks (Metablocks) |
| MetaWord* SpaceManager::allocate_work(size_t word_size) { |
| assert_lock_strong(_lock); |
| #ifdef ASSERT |
| if (Metadebug::test_metadata_failure()) { |
| return NULL; |
| } |
| #endif |
| // Is there space in the current chunk? |
| MetaWord* result = NULL; |
| |
| // For DumpSharedSpaces, only allocate out of the current chunk which is |
| // never null because we gave it the size we wanted. Caller reports out |
| // of memory if this returns null. |
| if (DumpSharedSpaces) { |
| assert(current_chunk() != NULL, "should never happen"); |
| inc_used_metrics(word_size); |
| return current_chunk()->allocate(word_size); // caller handles null result |
| } |
| |
| if (current_chunk() != NULL) { |
| result = current_chunk()->allocate(word_size); |
| } |
| |
| if (result == NULL) { |
| result = grow_and_allocate(word_size); |
| } |
| |
| if (result != NULL) { |
| inc_used_metrics(word_size); |
| assert(result != (MetaWord*) chunks_in_use(MediumIndex), |
| "Head of the list is being allocated"); |
| } |
| |
| return result; |
| } |
| |
| void SpaceManager::verify() { |
| // If there are blocks in the dictionary, then |
| // verification of chunks does not work since |
| // being in the dictionary alters a chunk. |
| if (block_freelists() != NULL && block_freelists()->total_size() == 0) { |
| for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) { |
| Metachunk* curr = chunks_in_use(i); |
| while (curr != NULL) { |
| curr->verify(); |
| verify_chunk_size(curr); |
| curr = curr->next(); |
| } |
| } |
| } |
| } |
| |
| void SpaceManager::verify_chunk_size(Metachunk* chunk) { |
| assert(is_humongous(chunk->word_size()) || |
| chunk->word_size() == medium_chunk_size() || |
| chunk->word_size() == small_chunk_size() || |
| chunk->word_size() == specialized_chunk_size(), |
| "Chunk size is wrong"); |
| return; |
| } |
| |
| #ifdef ASSERT |
| void SpaceManager::verify_allocated_blocks_words() { |
| // Verification is only guaranteed at a safepoint. |
| assert(SafepointSynchronize::is_at_safepoint() || !Universe::is_fully_initialized(), |
| "Verification can fail if the applications is running"); |
| assert(allocated_blocks_words() == sum_used_in_chunks_in_use(), |
| "allocation total is not consistent " SIZE_FORMAT |
| " vs " SIZE_FORMAT, |
| allocated_blocks_words(), sum_used_in_chunks_in_use()); |
| } |
| |
| #endif |
| |
| void SpaceManager::dump(outputStream* const out) const { |
| size_t curr_total = 0; |
| size_t waste = 0; |
| uint i = 0; |
| size_t used = 0; |
| size_t capacity = 0; |
| |
| // Add up statistics for all chunks in this SpaceManager. |
| for (ChunkIndex index = ZeroIndex; |
| index < NumberOfInUseLists; |
| index = next_chunk_index(index)) { |
| for (Metachunk* curr = chunks_in_use(index); |
| curr != NULL; |
| curr = curr->next()) { |
| out->print("%d) ", i++); |
| curr->print_on(out); |
| curr_total += curr->word_size(); |
| used += curr->used_word_size(); |
| capacity += curr->word_size(); |
| waste += curr->free_word_size() + curr->overhead();; |
| } |
| } |
| |
| if (log_is_enabled(Trace, gc, metaspace, freelist)) { |
| if (block_freelists() != NULL) block_freelists()->print_on(out); |
| } |
| |
| size_t free = current_chunk() == NULL ? 0 : current_chunk()->free_word_size(); |
| // Free space isn't wasted. |
| waste -= free; |
| |
| out->print_cr("total of all chunks " SIZE_FORMAT " used " SIZE_FORMAT |
| " free " SIZE_FORMAT " capacity " SIZE_FORMAT |
| " waste " SIZE_FORMAT, curr_total, used, free, capacity, waste); |
| } |
| |
| // MetaspaceAux |
| |
| |
| size_t MetaspaceAux::_capacity_words[] = {0, 0}; |
| size_t MetaspaceAux::_used_words[] = {0, 0}; |
| |
| size_t MetaspaceAux::free_bytes(Metaspace::MetadataType mdtype) { |
| VirtualSpaceList* list = Metaspace::get_space_list(mdtype); |
| return list == NULL ? 0 : list->free_bytes(); |
| } |
| |
| size_t MetaspaceAux::free_bytes() { |
| return free_bytes(Metaspace::ClassType) + free_bytes(Metaspace::NonClassType); |
| } |
| |
| void MetaspaceAux::dec_capacity(Metaspace::MetadataType mdtype, size_t words) { |
| assert_lock_strong(SpaceManager::expand_lock()); |
| assert(words <= capacity_words(mdtype), |
| "About to decrement below 0: words " SIZE_FORMAT |
| " is greater than _capacity_words[%u] " SIZE_FORMAT, |
| words, mdtype, capacity_words(mdtype)); |
| _capacity_words[mdtype] -= words; |
| } |
| |
| void MetaspaceAux::inc_capacity(Metaspace::MetadataType mdtype, size_t words) { |
| assert_lock_strong(SpaceManager::expand_lock()); |
| // Needs to be atomic |
| _capacity_words[mdtype] += words; |
| } |
| |
| void MetaspaceAux::dec_used(Metaspace::MetadataType mdtype, size_t words) { |
| assert(words <= used_words(mdtype), |
| "About to decrement below 0: words " SIZE_FORMAT |
| " is greater than _used_words[%u] " SIZE_FORMAT, |
| words, mdtype, used_words(mdtype)); |
| // For CMS deallocation of the Metaspaces occurs during the |
| // sweep which is a concurrent phase. Protection by the expand_lock() |
| // is not enough since allocation is on a per Metaspace basis |
| // and protected by the Metaspace lock. |
| jlong minus_words = (jlong) - (jlong) words; |
| Atomic::add_ptr(minus_words, &_used_words[mdtype]); |
| } |
| |
| void MetaspaceAux::inc_used(Metaspace::MetadataType mdtype, size_t words) { |
| // _used_words tracks allocations for |
| // each piece of metadata. Those allocations are |
| // generally done concurrently by different application |
| // threads so must be done atomically. |
| Atomic::add_ptr(words, &_used_words[mdtype]); |
| } |
| |
| size_t MetaspaceAux::used_bytes_slow(Metaspace::MetadataType mdtype) { |
| size_t used = 0; |
| ClassLoaderDataGraphMetaspaceIterator iter; |
| while (iter.repeat()) { |
| Metaspace* msp = iter.get_next(); |
| // Sum allocated_blocks_words for each metaspace |
| if (msp != NULL) { |
| used += msp->used_words_slow(mdtype); |
| } |
| } |
| return used * BytesPerWord; |
| } |
| |
| size_t MetaspaceAux::free_bytes_slow(Metaspace::MetadataType mdtype) { |
| size_t free = 0; |
| ClassLoaderDataGraphMetaspaceIterator iter; |
| while (iter.repeat()) { |
| Metaspace* msp = iter.get_next(); |
| if (msp != NULL) { |
| free += msp->free_words_slow(mdtype); |
| } |
| } |
| return free * BytesPerWord; |
| } |
| |
| size_t MetaspaceAux::capacity_bytes_slow(Metaspace::MetadataType mdtype) { |
| if ((mdtype == Metaspace::ClassType) && !Metaspace::using_class_space()) { |
| return 0; |
| } |
| // Don't count the space in the freelists. That space will be |
| // added to the capacity calculation as needed. |
| size_t capacity = 0; |
| ClassLoaderDataGraphMetaspaceIterator iter; |
| while (iter.repeat()) { |
| Metaspace* msp = iter.get_next(); |
| if (msp != NULL) { |
| capacity += msp->capacity_words_slow(mdtype); |
| } |
| } |
| return capacity * BytesPerWord; |
| } |
| |
| size_t MetaspaceAux::capacity_bytes_slow() { |
| #ifdef PRODUCT |
| // Use capacity_bytes() in PRODUCT instead of this function. |
| guarantee(false, "Should not call capacity_bytes_slow() in the PRODUCT"); |
| #endif |
| size_t class_capacity = capacity_bytes_slow(Metaspace::ClassType); |
| size_t non_class_capacity = capacity_bytes_slow(Metaspace::NonClassType); |
| assert(capacity_bytes() == class_capacity + non_class_capacity, |
| "bad accounting: capacity_bytes() " SIZE_FORMAT |
| " class_capacity + non_class_capacity " SIZE_FORMAT |
| " class_capacity " SIZE_FORMAT " non_class_capacity " SIZE_FORMAT, |
| capacity_bytes(), class_capacity + non_class_capacity, |
| class_capacity, non_class_capacity); |
| |
| return class_capacity + non_class_capacity; |
| } |
| |
| size_t MetaspaceAux::reserved_bytes(Metaspace::MetadataType mdtype) { |
| VirtualSpaceList* list = Metaspace::get_space_list(mdtype); |
| return list == NULL ? 0 : list->reserved_bytes(); |
| } |
| |
| size_t MetaspaceAux::committed_bytes(Metaspace::MetadataType mdtype) { |
| VirtualSpaceList* list = Metaspace::get_space_list(mdtype); |
| return list == NULL ? 0 : list->committed_bytes(); |
| } |
| |
| size_t MetaspaceAux::min_chunk_size_words() { return Metaspace::first_chunk_word_size(); } |
| |
| size_t MetaspaceAux::free_chunks_total_words(Metaspace::MetadataType mdtype) { |
| ChunkManager* chunk_manager = Metaspace::get_chunk_manager(mdtype); |
| if (chunk_manager == NULL) { |
| return 0; |
| } |
| chunk_manager->slow_verify(); |
| return chunk_manager->free_chunks_total_words(); |
| } |
| |
| size_t MetaspaceAux::free_chunks_total_bytes(Metaspace::MetadataType mdtype) { |
| return free_chunks_total_words(mdtype) * BytesPerWord; |
| } |
| |
| size_t MetaspaceAux::free_chunks_total_words() { |
| return free_chunks_total_words(Metaspace::ClassType) + |
| free_chunks_total_words(Metaspace::NonClassType); |
| } |
| |
| size_t MetaspaceAux::free_chunks_total_bytes() { |
| return free_chunks_total_words() * BytesPerWord; |
| } |
| |
| bool MetaspaceAux::has_chunk_free_list(Metaspace::MetadataType mdtype) { |
| return Metaspace::get_chunk_manager(mdtype) != NULL; |
| } |
| |
| MetaspaceChunkFreeListSummary MetaspaceAux::chunk_free_list_summary(Metaspace::MetadataType mdtype) { |
| if (!has_chunk_free_list(mdtype)) { |
| return MetaspaceChunkFreeListSummary(); |
| } |
| |
| const ChunkManager* cm = Metaspace::get_chunk_manager(mdtype); |
| return cm->chunk_free_list_summary(); |
| } |
| |
| void MetaspaceAux::print_metaspace_change(size_t prev_metadata_used) { |
| log_info(gc, metaspace)("Metaspace: " SIZE_FORMAT "K->" SIZE_FORMAT "K(" SIZE_FORMAT "K)", |
| prev_metadata_used/K, used_bytes()/K, reserved_bytes()/K); |
| } |
| |
| void MetaspaceAux::print_on(outputStream* out) { |
| Metaspace::MetadataType nct = Metaspace::NonClassType; |
| |
| out->print_cr(" Metaspace " |
| "used " SIZE_FORMAT "K, " |
| "capacity " SIZE_FORMAT "K, " |
| "committed " SIZE_FORMAT "K, " |
| "reserved " SIZE_FORMAT "K", |
| used_bytes()/K, |
| capacity_bytes()/K, |
| committed_bytes()/K, |
| reserved_bytes()/K); |
| |
| if (Metaspace::using_class_space()) { |
| Metaspace::MetadataType ct = Metaspace::ClassType; |
| out->print_cr(" class space " |
| "used " SIZE_FORMAT "K, " |
| "capacity " SIZE_FORMAT "K, " |
| "committed " SIZE_FORMAT "K, " |
| "reserved " SIZE_FORMAT "K", |
| used_bytes(ct)/K, |
| capacity_bytes(ct)/K, |
| committed_bytes(ct)/K, |
| reserved_bytes(ct)/K); |
| } |
| } |
| |
| // Print information for class space and data space separately. |
| // This is almost the same as above. |
| void MetaspaceAux::print_on(outputStream* out, Metaspace::MetadataType mdtype) { |
| size_t free_chunks_capacity_bytes = free_chunks_total_bytes(mdtype); |
| size_t capacity_bytes = capacity_bytes_slow(mdtype); |
| size_t used_bytes = used_bytes_slow(mdtype); |
| size_t free_bytes = free_bytes_slow(mdtype); |
| size_t used_and_free = used_bytes + free_bytes + |
| free_chunks_capacity_bytes; |
| out->print_cr(" Chunk accounting: used in chunks " SIZE_FORMAT |
| "K + unused in chunks " SIZE_FORMAT "K + " |
| " capacity in free chunks " SIZE_FORMAT "K = " SIZE_FORMAT |
| "K capacity in allocated chunks " SIZE_FORMAT "K", |
| used_bytes / K, |
| free_bytes / K, |
| free_chunks_capacity_bytes / K, |
| used_and_free / K, |
| capacity_bytes / K); |
| // Accounting can only be correct if we got the values during a safepoint |
| assert(!SafepointSynchronize::is_at_safepoint() || used_and_free == capacity_bytes, "Accounting is wrong"); |
| } |
| |
| // Print total fragmentation for class metaspaces |
| void MetaspaceAux::print_class_waste(outputStream* out) { |
| assert(Metaspace::using_class_space(), "class metaspace not used"); |
| size_t cls_specialized_waste = 0, cls_small_waste = 0, cls_medium_waste = 0; |
| size_t cls_specialized_count = 0, cls_small_count = 0, cls_medium_count = 0, cls_humongous_count = 0; |
| ClassLoaderDataGraphMetaspaceIterator iter; |
| while (iter.repeat()) { |
| Metaspace* msp = iter.get_next(); |
| if (msp != NULL) { |
| cls_specialized_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SpecializedIndex); |
| cls_specialized_count += msp->class_vsm()->sum_count_in_chunks_in_use(SpecializedIndex); |
| cls_small_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SmallIndex); |
| cls_small_count += msp->class_vsm()->sum_count_in_chunks_in_use(SmallIndex); |
| cls_medium_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(MediumIndex); |
| cls_medium_count += msp->class_vsm()->sum_count_in_chunks_in_use(MediumIndex); |
| cls_humongous_count += msp->class_vsm()->sum_count_in_chunks_in_use(HumongousIndex); |
| } |
| } |
| out->print_cr(" class: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", " |
| SIZE_FORMAT " small(s) " SIZE_FORMAT ", " |
| SIZE_FORMAT " medium(s) " SIZE_FORMAT ", " |
| "large count " SIZE_FORMAT, |
| cls_specialized_count, cls_specialized_waste, |
| cls_small_count, cls_small_waste, |
| cls_medium_count, cls_medium_waste, cls_humongous_count); |
| } |
| |
| // Print total fragmentation for data and class metaspaces separately |
| void MetaspaceAux::print_waste(outputStream* out) { |
| size_t specialized_waste = 0, small_waste = 0, medium_waste = 0; |
| size_t specialized_count = 0, small_count = 0, medium_count = 0, humongous_count = 0; |
| |
| ClassLoaderDataGraphMetaspaceIterator iter; |
| while (iter.repeat()) { |
| Metaspace* msp = iter.get_next(); |
| if (msp != NULL) { |
| specialized_waste += msp->vsm()->sum_waste_in_chunks_in_use(SpecializedIndex); |
| specialized_count += msp->vsm()->sum_count_in_chunks_in_use(SpecializedIndex); |
| small_waste += msp->vsm()->sum_waste_in_chunks_in_use(SmallIndex); |
| small_count += msp->vsm()->sum_count_in_chunks_in_use(SmallIndex); |
| medium_waste += msp->vsm()->sum_waste_in_chunks_in_use(MediumIndex); |
| medium_count += msp->vsm()->sum_count_in_chunks_in_use(MediumIndex); |
| humongous_count += msp->vsm()->sum_count_in_chunks_in_use(HumongousIndex); |
| } |
| } |
| out->print_cr("Total fragmentation waste (words) doesn't count free space"); |
| out->print_cr(" data: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", " |
| SIZE_FORMAT " small(s) " SIZE_FORMAT ", " |
| SIZE_FORMAT " medium(s) " SIZE_FORMAT ", " |
| "large count " SIZE_FORMAT, |
| specialized_count, specialized_waste, small_count, |
| small_waste, medium_count, medium_waste, humongous_count); |
| if (Metaspace::using_class_space()) { |
| print_class_waste(out); |
| } |
| } |
| |
| // Dump global metaspace things from the end of ClassLoaderDataGraph |
| void MetaspaceAux::dump(outputStream* out) { |
| out->print_cr("All Metaspace:"); |
| out->print("data space: "); print_on(out, Metaspace::NonClassType); |
| out->print("class space: "); print_on(out, Metaspace::ClassType); |
| print_waste(out); |
| } |
| |
| void MetaspaceAux::verify_free_chunks() { |
| Metaspace::chunk_manager_metadata()->verify(); |
| if (Metaspace::using_class_space()) { |
| Metaspace::chunk_manager_class()->verify(); |
| } |
| } |
| |
| void MetaspaceAux::verify_capacity() { |
| #ifdef ASSERT |
| size_t running_sum_capacity_bytes = capacity_bytes(); |
| // For purposes of the running sum of capacity, verify against capacity |
| size_t capacity_in_use_bytes = capacity_bytes_slow(); |
| assert(running_sum_capacity_bytes == capacity_in_use_bytes, |
| "capacity_words() * BytesPerWord " SIZE_FORMAT |
| " capacity_bytes_slow()" SIZE_FORMAT, |
| running_sum_capacity_bytes, capacity_in_use_bytes); |
| for (Metaspace::MetadataType i = Metaspace::ClassType; |
| i < Metaspace:: MetadataTypeCount; |
| i = (Metaspace::MetadataType)(i + 1)) { |
| size_t capacity_in_use_bytes = capacity_bytes_slow(i); |
| assert(capacity_bytes(i) == capacity_in_use_bytes, |
| "capacity_bytes(%u) " SIZE_FORMAT |
| " capacity_bytes_slow(%u)" SIZE_FORMAT, |
| i, capacity_bytes(i), i, capacity_in_use_bytes); |
| } |
| #endif |
| } |
| |
| void MetaspaceAux::verify_used() { |
| #ifdef ASSERT |
| size_t running_sum_used_bytes = used_bytes(); |
| // For purposes of the running sum of used, verify against used |
| size_t used_in_use_bytes = used_bytes_slow(); |
| assert(used_bytes() == used_in_use_bytes, |
| "used_bytes() " SIZE_FORMAT |
| " used_bytes_slow()" SIZE_FORMAT, |
| used_bytes(), used_in_use_bytes); |
| for (Metaspace::MetadataType i = Metaspace::ClassType; |
| i < Metaspace:: MetadataTypeCount; |
| i = (Metaspace::MetadataType)(i + 1)) { |
| size_t used_in_use_bytes = used_bytes_slow(i); |
| assert(used_bytes(i) == used_in_use_bytes, |
| "used_bytes(%u) " SIZE_FORMAT |
| " used_bytes_slow(%u)" SIZE_FORMAT, |
| i, used_bytes(i), i, used_in_use_bytes); |
| } |
| #endif |
| } |
| |
| void MetaspaceAux::verify_metrics() { |
| verify_capacity(); |
| verify_used(); |
| } |
| |
| |
| // Metaspace methods |
| |
| size_t Metaspace::_first_chunk_word_size = 0; |
| size_t Metaspace::_first_class_chunk_word_size = 0; |
| |
| size_t Metaspace::_commit_alignment = 0; |
| size_t Metaspace::_reserve_alignment = 0; |
| |
| Metaspace::Metaspace(Mutex* lock, MetaspaceType type) { |
| initialize(lock, type); |
| } |
| |
| Metaspace::~Metaspace() { |
| delete _vsm; |
| if (using_class_space()) { |
| delete _class_vsm; |
| } |
| } |
| |
| VirtualSpaceList* Metaspace::_space_list = NULL; |
| VirtualSpaceList* Metaspace::_class_space_list = NULL; |
| |
| ChunkManager* Metaspace::_chunk_manager_metadata = NULL; |
| ChunkManager* Metaspace::_chunk_manager_class = NULL; |
| |
| #define VIRTUALSPACEMULTIPLIER 2 |
| |
| #ifdef _LP64 |
| static const uint64_t UnscaledClassSpaceMax = (uint64_t(max_juint) + 1); |
| |
| void Metaspace::set_narrow_klass_base_and_shift(address metaspace_base, address cds_base) { |
| // Figure out the narrow_klass_base and the narrow_klass_shift. The |
| // narrow_klass_base is the lower of the metaspace base and the cds base |
| // (if cds is enabled). The narrow_klass_shift depends on the distance |
| // between the lower base and higher address. |
| address lower_base; |
| address higher_address; |
| #if INCLUDE_CDS |
| if (UseSharedSpaces) { |
| higher_address = MAX2((address)(cds_base + FileMapInfo::shared_spaces_size()), |
| (address)(metaspace_base + compressed_class_space_size())); |
| lower_base = MIN2(metaspace_base, cds_base); |
| } else |
| #endif |
| { |
| higher_address = metaspace_base + compressed_class_space_size(); |
| lower_base = metaspace_base; |
| |
| uint64_t klass_encoding_max = UnscaledClassSpaceMax << LogKlassAlignmentInBytes; |
| // If compressed class space fits in lower 32G, we don't need a base. |
| if (higher_address <= (address)klass_encoding_max) { |
| lower_base = 0; // Effectively lower base is zero. |
| } |
| } |
| |
| Universe::set_narrow_klass_base(lower_base); |
| |
| if ((uint64_t)(higher_address - lower_base) <= UnscaledClassSpaceMax) { |
| Universe::set_narrow_klass_shift(0); |
| } else { |
| assert(!UseSharedSpaces, "Cannot shift with UseSharedSpaces"); |
| Universe::set_narrow_klass_shift(LogKlassAlignmentInBytes); |
| } |
| AOTLoader::set_narrow_klass_shift(); |
| } |
| |
| #if INCLUDE_CDS |
| // Return TRUE if the specified metaspace_base and cds_base are close enough |
| // to work with compressed klass pointers. |
| bool Metaspace::can_use_cds_with_metaspace_addr(char* metaspace_base, address cds_base) { |
| assert(cds_base != 0 && UseSharedSpaces, "Only use with CDS"); |
| assert(UseCompressedClassPointers, "Only use with CompressedKlassPtrs"); |
| address lower_base = MIN2((address)metaspace_base, cds_base); |
| address higher_address = MAX2((address)(cds_base + FileMapInfo::shared_spaces_size()), |
| (address)(metaspace_base + compressed_class_space_size())); |
| return ((uint64_t)(higher_address - lower_base) <= UnscaledClassSpaceMax); |
| } |
| #endif |
| |
| // Try to allocate the metaspace at the requested addr. |
| void Metaspace::allocate_metaspace_compressed_klass_ptrs(char* requested_addr, address cds_base) { |
| assert(using_class_space(), "called improperly"); |
| assert(UseCompressedClassPointers, "Only use with CompressedKlassPtrs"); |
| assert(compressed_class_space_size() < KlassEncodingMetaspaceMax, |
| "Metaspace size is too big"); |
| assert_is_ptr_aligned(requested_addr, _reserve_alignment); |
| assert_is_ptr_aligned(cds_base, _reserve_alignment); |
| assert_is_size_aligned(compressed_class_space_size(), _reserve_alignment); |
| |
| // Don't use large pages for the class space. |
| bool large_pages = false; |
| |
| #if !(defined(AARCH64) || defined(AIX)) |
| ReservedSpace metaspace_rs = ReservedSpace(compressed_class_space_size(), |
| _reserve_alignment, |
| large_pages, |
| requested_addr); |
| #else // AARCH64 |
| ReservedSpace metaspace_rs; |
| |
| // Our compressed klass pointers may fit nicely into the lower 32 |
| // bits. |
| if ((uint64_t)requested_addr + compressed_class_space_size() < 4*G) { |
| metaspace_rs = ReservedSpace(compressed_class_space_size(), |
| _reserve_alignment, |
| large_pages, |
| requested_addr); |
| } |
| |
| if (! metaspace_rs.is_reserved()) { |
| // Aarch64: Try to align metaspace so that we can decode a compressed |
| // klass with a single MOVK instruction. We can do this iff the |
| // compressed class base is a multiple of 4G. |
| // Aix: Search for a place where we can find memory. If we need to load |
| // the base, 4G alignment is helpful, too. |
| size_t increment = AARCH64_ONLY(4*)G; |
| for (char *a = (char*)align_ptr_up(requested_addr, increment); |
| a < (char*)(1024*G); |
| a += increment) { |
| if (a == (char *)(32*G)) { |
| // Go faster from here on. Zero-based is no longer possible. |
| increment = 4*G; |
| } |
| |
| #if INCLUDE_CDS |
| if (UseSharedSpaces |
| && ! can_use_cds_with_metaspace_addr(a, cds_base)) { |
| // We failed to find an aligned base that will reach. Fall |
| // back to using our requested addr. |
| metaspace_rs = ReservedSpace(compressed_class_space_size(), |
| _reserve_alignment, |
| large_pages, |
| requested_addr); |
| break; |
| } |
| #endif |
| |
| metaspace_rs = ReservedSpace(compressed_class_space_size(), |
| _reserve_alignment, |
| large_pages, |
| a); |
| if (metaspace_rs.is_reserved()) |
| break; |
| } |
| } |
| |
| #endif // AARCH64 |
| |
| if (!metaspace_rs.is_reserved()) { |
| #if INCLUDE_CDS |
| if (UseSharedSpaces) { |
| size_t increment = align_size_up(1*G, _reserve_alignment); |
| |
| // Keep trying to allocate the metaspace, increasing the requested_addr |
| // by 1GB each time, until we reach an address that will no longer allow |
| // use of CDS with compressed klass pointers. |
| char *addr = requested_addr; |
| while (!metaspace_rs.is_reserved() && (addr + increment > addr) && |
| can_use_cds_with_metaspace_addr(addr + increment, cds_base)) { |
| addr = addr + increment; |
| metaspace_rs = ReservedSpace(compressed_class_space_size(), |
| _reserve_alignment, large_pages, addr); |
| } |
| } |
| #endif |
| // If no successful allocation then try to allocate the space anywhere. If |
| // that fails then OOM doom. At this point we cannot try allocating the |
| // metaspace as if UseCompressedClassPointers is off because too much |
| // initialization has happened that depends on UseCompressedClassPointers. |
| // So, UseCompressedClassPointers cannot be turned off at this point. |
| if (!metaspace_rs.is_reserved()) { |
| metaspace_rs = ReservedSpace(compressed_class_space_size(), |
| _reserve_alignment, large_pages); |
| if (!metaspace_rs.is_reserved()) { |
| vm_exit_during_initialization(err_msg("Could not allocate metaspace: " SIZE_FORMAT " bytes", |
| compressed_class_space_size())); |
| } |
| } |
| } |
| |
| // If we got here then the metaspace got allocated. |
| MemTracker::record_virtual_memory_type((address)metaspace_rs.base(), mtClass); |
| |
| #if INCLUDE_CDS |
| // Verify that we can use shared spaces. Otherwise, turn off CDS. |
| if (UseSharedSpaces && !can_use_cds_with_metaspace_addr(metaspace_rs.base(), cds_base)) { |
| FileMapInfo::stop_sharing_and_unmap( |
| "Could not allocate metaspace at a compatible address"); |
| } |
| #endif |
| set_narrow_klass_base_and_shift((address)metaspace_rs.base(), |
| UseSharedSpaces ? (address)cds_base : 0); |
| |
| initialize_class_space(metaspace_rs); |
| |
| if (log_is_enabled(Trace, gc, metaspace)) { |
| Log(gc, metaspace) log; |
| ResourceMark rm; |
| print_compressed_class_space(log.trace_stream(), requested_addr); |
| } |
| } |
| |
| void Metaspace::print_compressed_class_space(outputStream* st, const char* requested_addr) { |
| st->print_cr("Narrow klass base: " PTR_FORMAT ", Narrow klass shift: %d", |
| p2i(Universe::narrow_klass_base()), Universe::narrow_klass_shift()); |
| if (_class_space_list != NULL) { |
| address base = (address)_class_space_list->current_virtual_space()->bottom(); |
| st->print("Compressed class space size: " SIZE_FORMAT " Address: " PTR_FORMAT, |
| compressed_class_space_size(), p2i(base)); |
| if (requested_addr != 0) { |
| st->print(" Req Addr: " PTR_FORMAT, p2i(requested_addr)); |
| } |
| st->cr(); |
| } |
| } |
| |
| // For UseCompressedClassPointers the class space is reserved above the top of |
| // the Java heap. The argument passed in is at the base of the compressed space. |
| void Metaspace::initialize_class_space(ReservedSpace rs) { |
| // The reserved space size may be bigger because of alignment, esp with UseLargePages |
| assert(rs.size() >= CompressedClassSpaceSize, |
| SIZE_FORMAT " != " SIZE_FORMAT, rs.size(), CompressedClassSpaceSize); |
| assert(using_class_space(), "Must be using class space"); |
| _class_space_list = new VirtualSpaceList(rs); |
| _chunk_manager_class = new ChunkManager(ClassSpecializedChunk, ClassSmallChunk, ClassMediumChunk); |
| |
| if (!_class_space_list->initialization_succeeded()) { |
| vm_exit_during_initialization("Failed to setup compressed class space virtual space list."); |
| } |
| } |
| |
| #endif |
| |
| void Metaspace::ergo_initialize() { |
| if (DumpSharedSpaces) { |
| // Using large pages when dumping the shared archive is currently not implemented. |
| FLAG_SET_ERGO(bool, UseLargePagesInMetaspace, false); |
| } |
| |
| size_t page_size = os::vm_page_size(); |
| if (UseLargePages && UseLargePagesInMetaspace) { |
| page_size = os::large_page_size(); |
| } |
| |
| _commit_alignment = page_size; |
| _reserve_alignment = MAX2(page_size, (size_t)os::vm_allocation_granularity()); |
| |
| // Do not use FLAG_SET_ERGO to update MaxMetaspaceSize, since this will |
| // override if MaxMetaspaceSize was set on the command line or not. |
| // This information is needed later to conform to the specification of the |
| // java.lang.management.MemoryUsage API. |
| // |
| // Ideally, we would be able to set the default value of MaxMetaspaceSize in |
| // globals.hpp to the aligned value, but this is not possible, since the |
| // alignment depends on other flags being parsed. |
| MaxMetaspaceSize = align_size_down_bounded(MaxMetaspaceSize, _reserve_alignment); |
| |
| if (MetaspaceSize > MaxMetaspaceSize) { |
| MetaspaceSize = MaxMetaspaceSize; |
| } |
| |
| MetaspaceSize = align_size_down_bounded(MetaspaceSize, _commit_alignment); |
| |
| assert(MetaspaceSize <= MaxMetaspaceSize, "MetaspaceSize should be limited by MaxMetaspaceSize"); |
| |
| MinMetaspaceExpansion = align_size_down_bounded(MinMetaspaceExpansion, _commit_alignment); |
| MaxMetaspaceExpansion = align_size_down_bounded(MaxMetaspaceExpansion, _commit_alignment); |
| |
| CompressedClassSpaceSize = align_size_down_bounded(CompressedClassSpaceSize, _reserve_alignment); |
| set_compressed_class_space_size(CompressedClassSpaceSize); |
| } |
| |
| void Metaspace::global_initialize() { |
| MetaspaceGC::initialize(); |
| |
| // Initialize the alignment for shared spaces. |
| int max_alignment = os::vm_allocation_granularity(); |
| size_t cds_total = 0; |
| |
| MetaspaceShared::set_max_alignment(max_alignment); |
| |
| if (DumpSharedSpaces) { |
| #if INCLUDE_CDS |
| MetaspaceShared::estimate_regions_size(); |
| |
| SharedReadOnlySize = align_size_up(SharedReadOnlySize, max_alignment); |
| SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment); |
| SharedMiscDataSize = align_size_up(SharedMiscDataSize, max_alignment); |
| SharedMiscCodeSize = align_size_up(SharedMiscCodeSize, max_alignment); |
| |
| // Initialize with the sum of the shared space sizes. The read-only |
| // and read write metaspace chunks will be allocated out of this and the |
| // remainder is the misc code and data chunks. |
| cds_total = FileMapInfo::shared_spaces_size(); |
| cds_total = align_size_up(cds_total, _reserve_alignment); |
| _space_list = new VirtualSpaceList(cds_total/wordSize); |
| _chunk_manager_metadata = new ChunkManager(SpecializedChunk, SmallChunk, MediumChunk); |
| |
| if (!_space_list->initialization_succeeded()) { |
| vm_exit_during_initialization("Unable to dump shared archive.", NULL); |
| } |
| |
| #ifdef _LP64 |
| if (cds_total + compressed_class_space_size() > UnscaledClassSpaceMax) { |
| vm_exit_during_initialization("Unable to dump shared archive.", |
| err_msg("Size of archive (" SIZE_FORMAT ") + compressed class space (" |
| SIZE_FORMAT ") == total (" SIZE_FORMAT ") is larger than compressed " |
| "klass limit: " UINT64_FORMAT, cds_total, compressed_class_space_size(), |
| cds_total + compressed_class_space_size(), UnscaledClassSpaceMax)); |
| } |
| |
| // Set the compressed klass pointer base so that decoding of these pointers works |
| // properly when creating the shared archive. |
| assert(UseCompressedOops && UseCompressedClassPointers, |
| "UseCompressedOops and UseCompressedClassPointers must be set"); |
| Universe::set_narrow_klass_base((address)_space_list->current_virtual_space()->bottom()); |
| log_develop_trace(gc, metaspace)("Setting_narrow_klass_base to Address: " PTR_FORMAT, |
| p2i(_space_list->current_virtual_space()->bottom())); |
| |
| Universe::set_narrow_klass_shift(0); |
| #endif // _LP64 |
| #endif // INCLUDE_CDS |
| } else { |
| #if INCLUDE_CDS |
| if (UseSharedSpaces) { |
| // If using shared space, open the file that contains the shared space |
| // and map in the memory before initializing the rest of metaspace (so |
| // the addresses don't conflict) |
| address cds_address = NULL; |
| FileMapInfo* mapinfo = new FileMapInfo(); |
| |
| // Open the shared archive file, read and validate the header. If |
| // initialization fails, shared spaces [UseSharedSpaces] are |
| // disabled and the file is closed. |
| // Map in spaces now also |
| if (mapinfo->initialize() && MetaspaceShared::map_shared_spaces(mapinfo)) { |
| cds_total = FileMapInfo::shared_spaces_size(); |
| cds_address = (address)mapinfo->header()->region_addr(0); |
| #ifdef _LP64 |
| if (using_class_space()) { |
| char* cds_end = (char*)(cds_address + cds_total); |
| cds_end = (char *)align_ptr_up(cds_end, _reserve_alignment); |
| // If UseCompressedClassPointers is set then allocate the metaspace area |
| // above the heap and above the CDS area (if it exists). |
| allocate_metaspace_compressed_klass_ptrs(cds_end, cds_address); |
| // Map the shared string space after compressed pointers |
| // because it relies on compressed class pointers setting to work |
| mapinfo->map_string_regions(); |
| } |
| #endif // _LP64 |
| } else { |
| assert(!mapinfo->is_open() && !UseSharedSpaces, |
| "archive file not closed or shared spaces not disabled."); |
| } |
| } |
| #endif // INCLUDE_CDS |
| |
| #ifdef _LP64 |
| if (!UseSharedSpaces && using_class_space()) { |
| char* base = (char*)align_ptr_up(Universe::heap()->reserved_region().end(), _reserve_alignment); |
| allocate_metaspace_compressed_klass_ptrs(base, 0); |
| } |
| #endif // _LP64 |
| |
| // Initialize these before initializing the VirtualSpaceList |
| _first_chunk_word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord; |
| _first_chunk_word_size = align_word_size_up(_first_chunk_word_size); |
| // Make the first class chunk bigger than a medium chunk so it's not put |
| // on the medium chunk list. The next chunk will be small and progress |
| // from there. This size calculated by -version. |
| _first_class_chunk_word_size = MIN2((size_t)MediumChunk*6, |
| (CompressedClassSpaceSize/BytesPerWord)*2); |
| _first_class_chunk_word_size = align_word_size_up(_first_class_chunk_word_size); |
| // Arbitrarily set the initial virtual space to a multiple |
| // of the boot class loader size. |
| size_t word_size = VIRTUALSPACEMULTIPLIER * _first_chunk_word_size; |
| word_size = align_size_up(word_size, Metaspace::reserve_alignment_words()); |
| |
| // Initialize the list of virtual spaces. |
| _space_list = new VirtualSpaceList(word_size); |
| _chunk_manager_metadata = new ChunkManager(SpecializedChunk, SmallChunk, MediumChunk); |
| |
| if (!_space_list->initialization_succeeded()) { |
| vm_exit_during_initialization("Unable to setup metadata virtual space list.", NULL); |
| } |
| } |
| |
| _tracer = new MetaspaceTracer(); |
| } |
| |
| void Metaspace::post_initialize() { |
| MetaspaceGC::post_initialize(); |
| } |
| |
| void Metaspace::initialize_first_chunk(MetaspaceType type, MetadataType mdtype) { |
| Metachunk* chunk = get_initialization_chunk(type, mdtype); |
| if (chunk != NULL) { |
| // Add to this manager's list of chunks in use and current_chunk(). |
| get_space_manager(mdtype)->add_chunk(chunk, true); |
| } |
| } |
| |
| Metachunk* Metaspace::get_initialization_chunk(MetaspaceType type, MetadataType mdtype) { |
| size_t chunk_word_size = get_space_manager(mdtype)->get_initial_chunk_size(type); |
| |
| // Get a chunk from the chunk freelist |
| Metachunk* chunk = get_chunk_manager(mdtype)->chunk_freelist_allocate(chunk_word_size); |
| |
| if (chunk == NULL) { |
| chunk = get_space_list(mdtype)->get_new_chunk(chunk_word_size, |
| get_space_manager(mdtype)->medium_chunk_bunch()); |
| } |
| |
| // For dumping shared archive, report error if allocation has failed. |
| if (DumpSharedSpaces && chunk == NULL) { |
| report_insufficient_metaspace(MetaspaceAux::committed_bytes() + chunk_word_size * BytesPerWord); |
| } |
| |
| return chunk; |
| } |
| |
| void Metaspace::verify_global_initialization() { |
| assert(space_list() != NULL, "Metadata VirtualSpaceList has not been initialized"); |
| assert(chunk_manager_metadata() != NULL, "Metadata ChunkManager has not been initialized"); |
| |
| if (using_class_space()) { |
| assert(class_space_list() != NULL, "Class VirtualSpaceList has not been initialized"); |
| assert(chunk_manager_class() != NULL, "Class ChunkManager has not been initialized"); |
| } |
| } |
| |
| void Metaspace::initialize(Mutex* lock, MetaspaceType type) { |
| verify_global_initialization(); |
| |
| // Allocate SpaceManager for metadata objects. |
| _vsm = new SpaceManager(NonClassType, lock); |
| |
| if (using_class_space()) { |
| // Allocate SpaceManager for classes. |
| _class_vsm = new SpaceManager(ClassType, lock); |
| } |
| |
| MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag); |
| |
| // Allocate chunk for metadata objects |
| initialize_first_chunk(type, NonClassType); |
| |
| // Allocate chunk for class metadata objects |
| if (using_class_space()) { |
| initialize_first_chunk(type, ClassType); |
| } |
| |
| _alloc_record_head = NULL; |
| _alloc_record_tail = NULL; |
| } |
| |
| size_t Metaspace::align_word_size_up(size_t word_size) { |
| size_t byte_size = word_size * wordSize; |
| return ReservedSpace::allocation_align_size_up(byte_size) / wordSize; |
| } |
| |
| MetaWord* Metaspace::allocate(size_t word_size, MetadataType mdtype) { |
| // DumpSharedSpaces doesn't use class metadata area (yet) |
| // Also, don't use class_vsm() unless UseCompressedClassPointers is true. |
| if (is_class_space_allocation(mdtype)) { |
| return class_vsm()->allocate(word_size); |
| } else { |
| return vsm()->allocate(word_size); |
| } |
| } |
| |
| MetaWord* Metaspace::expand_and_allocate(size_t word_size, MetadataType mdtype) { |
| size_t delta_bytes = MetaspaceGC::delta_capacity_until_GC(word_size * BytesPerWord); |
| assert(delta_bytes > 0, "Must be"); |
| |
| size_t before = 0; |
| size_t after = 0; |
| MetaWord* res; |
| bool incremented; |
| |
| // Each thread increments the HWM at most once. Even if the thread fails to increment |
| // the HWM, an allocation is still attempted. This is because another thread must then |
| // have incremented the HWM and therefore the allocation might still succeed. |
| do { |
| incremented = MetaspaceGC::inc_capacity_until_GC(delta_bytes, &after, &before); |
| res = allocate(word_size, mdtype); |
| } while (!incremented && res == NULL); |
| |
| if (incremented) { |
| tracer()->report_gc_threshold(before, after, |
| MetaspaceGCThresholdUpdater::ExpandAndAllocate); |
| log_trace(gc, metaspace)("Increase capacity to GC from " SIZE_FORMAT " to " SIZE_FORMAT, before, after); |
| } |
| |
| return res; |
| } |
| |
| // Space allocated in the Metaspace. This may |
| // be across several metadata virtual spaces. |
| char* Metaspace::bottom() const { |
| assert(DumpSharedSpaces, "only useful and valid for dumping shared spaces"); |
| return (char*)vsm()->current_chunk()->bottom(); |
| } |
| |
| size_t Metaspace::used_words_slow(MetadataType mdtype) const { |
| if (mdtype == ClassType) { |
| return using_class_space() ? class_vsm()->sum_used_in_chunks_in_use() : 0; |
| } else { |
| return vsm()->sum_used_in_chunks_in_use(); // includes overhead! |
| } |
| } |
| |
| size_t Metaspace::free_words_slow(MetadataType mdtype) const { |
| if (mdtype == ClassType) { |
| return using_class_space() ? class_vsm()->sum_free_in_chunks_in_use() : 0; |
| } else { |
| return vsm()->sum_free_in_chunks_in_use(); |
| } |
| } |
| |
| // Space capacity in the Metaspace. It includes |
| // space in the list of chunks from which allocations |
| // have been made. Don't include space in the global freelist and |
| // in the space available in the dictionary which |
| // is already counted in some chunk. |
| size_t Metaspace::capacity_words_slow(MetadataType mdtype) const { |
| if (mdtype == ClassType) { |
| return using_class_space() ? class_vsm()->sum_capacity_in_chunks_in_use() : 0; |
| } else { |
| return vsm()->sum_capacity_in_chunks_in_use(); |
| } |
| } |
| |
| size_t Metaspace::used_bytes_slow(MetadataType mdtype) const { |
| return used_words_slow(mdtype) * BytesPerWord; |
| } |
| |
| size_t Metaspace::capacity_bytes_slow(MetadataType mdtype) const { |
| return capacity_words_slow(mdtype) * BytesPerWord; |
| } |
| |
| size_t Metaspace::allocated_blocks_bytes() const { |
| return vsm()->allocated_blocks_bytes() + |
| (using_class_space() ? class_vsm()->allocated_blocks_bytes() : 0); |
| } |
| |
| size_t Metaspace::allocated_chunks_bytes() const { |
| return vsm()->allocated_chunks_bytes() + |
| (using_class_space() ? class_vsm()->allocated_chunks_bytes() : 0); |
| } |
| |
| void Metaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) { |
| assert(!SafepointSynchronize::is_at_safepoint() |
| || Thread::current()->is_VM_thread(), "should be the VM thread"); |
| |
| if (DumpSharedSpaces && PrintSharedSpaces) { |
| record_deallocation(ptr, vsm()->get_allocation_word_size(word_size)); |
| } |
| |
| MutexLockerEx ml(vsm()->lock(), Mutex::_no_safepoint_check_flag); |
| |
| if (is_class && using_class_space()) { |
| class_vsm()->deallocate(ptr, word_size); |
| } else { |
| vsm()->deallocate(ptr, word_size); |
| } |
| } |
| |
| |
| MetaWord* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size, |
| bool read_only, MetaspaceObj::Type type, TRAPS) { |
| if (HAS_PENDING_EXCEPTION) { |
| assert(false, "Should not allocate with exception pending"); |
| return NULL; // caller does a CHECK_NULL too |
| } |
| |
| assert(loader_data != NULL, "Should never pass around a NULL loader_data. " |
| "ClassLoaderData::the_null_class_loader_data() should have been used."); |
| |
| // Allocate in metaspaces without taking out a lock, because it deadlocks |
| // with the SymbolTable_lock. Dumping is single threaded for now. We'll have |
| // to revisit this for application class data sharing. |
| if (DumpSharedSpaces) { |
| assert(type > MetaspaceObj::UnknownType && type < MetaspaceObj::_number_of_types, "sanity"); |
| Metaspace* space = read_only ? loader_data->ro_metaspace() : loader_data->rw_metaspace(); |
| MetaWord* result = space->allocate(word_size, NonClassType); |
| if (result == NULL) { |
| report_out_of_shared_space(read_only ? SharedReadOnly : SharedReadWrite); |
| } |
| if (PrintSharedSpaces) { |
| space->record_allocation(result, type, space->vsm()->get_allocation_word_size(word_size)); |
| } |
| |
| // Zero initialize. |
| Copy::fill_to_words((HeapWord*)result, word_size, 0); |
| |
| return result; |
| } |
| |
| MetadataType mdtype = (type == MetaspaceObj::ClassType) ? ClassType : NonClassType; |
| |
| // Try to allocate metadata. |
| MetaWord* result = loader_data->metaspace_non_null()->allocate(word_size, mdtype); |
| |
| if (result == NULL) { |
| tracer()->report_metaspace_allocation_failure(loader_data, word_size, type, mdtype); |
| |
| // Allocation failed. |
| if (is_init_completed()) { |
| // Only start a GC if the bootstrapping has completed. |
| |
| // Try to clean out some memory and retry. |
| result = Universe::heap()->collector_policy()->satisfy_failed_metadata_allocation( |
| loader_data, word_size, mdtype); |
| } |
| } |
| |
| if (result == NULL) { |
| SpaceManager* sm; |
| if (is_class_space_allocation(mdtype)) { |
| sm = loader_data->metaspace_non_null()->class_vsm(); |
| } else { |
| sm = loader_data->metaspace_non_null()->vsm(); |
| } |
| |
| result = sm->get_small_chunk_and_allocate(word_size); |
| |
| if (result == NULL) { |
| report_metadata_oome(loader_data, word_size, type, mdtype, CHECK_NULL); |
| } |
| } |
| |
| // Zero initialize. |
| Copy::fill_to_words((HeapWord*)result, word_size, 0); |
| |
| return result; |
| } |
| |
| size_t Metaspace::class_chunk_size(size_t word_size) { |
| assert(using_class_space(), "Has to use class space"); |
| return class_vsm()->calc_chunk_size(word_size); |
| } |
| |
| void Metaspace::report_metadata_oome(ClassLoaderData* loader_data, size_t word_size, MetaspaceObj::Type type, MetadataType mdtype, TRAPS) { |
| tracer()->report_metadata_oom(loader_data, word_size, type, mdtype); |
| |
| // If result is still null, we are out of memory. |
| Log(gc, metaspace, freelist) log; |
| if (log.is_info()) { |
| log.info("Metaspace (%s) allocation failed for size " SIZE_FORMAT, |
| is_class_space_allocation(mdtype) ? "class" : "data", word_size); |
| ResourceMark rm; |
| outputStream* out = log.info_stream(); |
| if (loader_data->metaspace_or_null() != NULL) { |
| loader_data->dump(out); |
| } |
| MetaspaceAux::dump(out); |
| } |
| |
| bool out_of_compressed_class_space = false; |
| if (is_class_space_allocation(mdtype)) { |
| Metaspace* metaspace = loader_data->metaspace_non_null(); |
| out_of_compressed_class_space = |
| MetaspaceAux::committed_bytes(Metaspace::ClassType) + |
| (metaspace->class_chunk_size(word_size) * BytesPerWord) > |
| CompressedClassSpaceSize; |
| } |
| |
| // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support |
| const char* space_string = out_of_compressed_class_space ? |
| "Compressed class space" : "Metaspace"; |
| |
| report_java_out_of_memory(space_string); |
| |
| if (JvmtiExport::should_post_resource_exhausted()) { |
| JvmtiExport::post_resource_exhausted( |
| JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR, |
| space_string); |
| } |
| |
| if (!is_init_completed()) { |
| vm_exit_during_initialization("OutOfMemoryError", space_string); |
| } |
| |
| if (out_of_compressed_class_space) { |
| THROW_OOP(Universe::out_of_memory_error_class_metaspace()); |
| } else { |
| THROW_OOP(Universe::out_of_memory_error_metaspace()); |
| } |
| } |
| |
| const char* Metaspace::metadata_type_name(Metaspace::MetadataType mdtype) { |
| switch (mdtype) { |
| case Metaspace::ClassType: return "Class"; |
| case Metaspace::NonClassType: return "Metadata"; |
| default: |
| assert(false, "Got bad mdtype: %d", (int) mdtype); |
| return NULL; |
| } |
| } |
| |
| void Metaspace::record_allocation(void* ptr, MetaspaceObj::Type type, size_t word_size) { |
| assert(DumpSharedSpaces, "sanity"); |
| |
| int byte_size = (int)word_size * wordSize; |
| AllocRecord *rec = new AllocRecord((address)ptr, type, byte_size); |
| |
| if (_alloc_record_head == NULL) { |
| _alloc_record_head = _alloc_record_tail = rec; |
| } else if (_alloc_record_tail->_ptr + _alloc_record_tail->_byte_size == (address)ptr) { |
| _alloc_record_tail->_next = rec; |
| _alloc_record_tail = rec; |
| } else { |
| // slow linear search, but this doesn't happen that often, and only when dumping |
| for (AllocRecord *old = _alloc_record_head; old; old = old->_next) { |
| if (old->_ptr == ptr) { |
| assert(old->_type == MetaspaceObj::DeallocatedType, "sanity"); |
| int remain_bytes = old->_byte_size - byte_size; |
| assert(remain_bytes >= 0, "sanity"); |
| old->_type = type; |
| |
| if (remain_bytes == 0) { |
| delete(rec); |
| } else { |
| address remain_ptr = address(ptr) + byte_size; |
| rec->_ptr = remain_ptr; |
| rec->_byte_size = remain_bytes; |
| rec->_type = MetaspaceObj::DeallocatedType; |
| rec->_next = old->_next; |
| old->_byte_size = byte_size; |
| old->_next = rec; |
| } |
| return; |
| } |
| } |
| assert(0, "reallocating a freed pointer that was not recorded"); |
| } |
| } |
| |
| void Metaspace::record_deallocation(void* ptr, size_t word_size) { |
| assert(DumpSharedSpaces, "sanity"); |
| |
| for (AllocRecord *rec = _alloc_record_head; rec; rec = rec->_next) { |
| if (rec->_ptr == ptr) { |
| assert(rec->_byte_size == (int)word_size * wordSize, "sanity"); |
| rec->_type = MetaspaceObj::DeallocatedType; |
| return; |
| } |
| } |
| |
| assert(0, "deallocating a pointer that was not recorded"); |
| } |
| |
| void Metaspace::iterate(Metaspace::AllocRecordClosure *closure) { |
| assert(DumpSharedSpaces, "unimplemented for !DumpSharedSpaces"); |
| |
| address last_addr = (address)bottom(); |
| |
| for (AllocRecord *rec = _alloc_record_head; rec; rec = rec->_next) { |
| address ptr = rec->_ptr; |
| if (last_addr < ptr) { |
| closure->doit(last_addr, MetaspaceObj::UnknownType, ptr - last_addr); |
| } |
| closure->doit(ptr, rec->_type, rec->_byte_size); |
| last_addr = ptr + rec->_byte_size; |
| } |
| |
| address top = ((address)bottom()) + used_bytes_slow(Metaspace::NonClassType); |
| if (last_addr < top) { |
| closure->doit(last_addr, MetaspaceObj::UnknownType, top - last_addr); |
| } |
| } |
| |
| void Metaspace::purge(MetadataType mdtype) { |
| get_space_list(mdtype)->purge(get_chunk_manager(mdtype)); |
| } |
| |
| void Metaspace::purge() { |
| MutexLockerEx cl(SpaceManager::expand_lock(), |
| Mutex::_no_safepoint_check_flag); |
| purge(NonClassType); |
| if (using_class_space()) { |
| purge(ClassType); |
| } |
| } |
| |
| void Metaspace::print_on(outputStream* out) const { |
| // Print both class virtual space counts and metaspace. |
| if (Verbose) { |
| vsm()->print_on(out); |
| if (using_class_space()) { |
| class_vsm()->print_on(out); |
| } |
| } |
| } |
| |
| bool Metaspace::contains(const void* ptr) { |
| if (UseSharedSpaces && MetaspaceShared::is_in_shared_space(ptr)) { |
| return true; |
| } |
| |
| if (using_class_space() && get_space_list(ClassType)->contains(ptr)) { |
| return true; |
| } |
| |
| return get_space_list(NonClassType)->contains(ptr); |
| } |
| |
| void Metaspace::verify() { |
| vsm()->verify(); |
| if (using_class_space()) { |
| class_vsm()->verify(); |
| } |
| } |
| |
| void Metaspace::dump(outputStream* const out) const { |
| out->print_cr("\nVirtual space manager: " INTPTR_FORMAT, p2i(vsm())); |
| vsm()->dump(out); |
| if (using_class_space()) { |
| out->print_cr("\nClass space manager: " INTPTR_FORMAT, p2i(class_vsm())); |
| class_vsm()->dump(out); |
| } |
| } |
| |
| /////////////// Unit tests /////////////// |
| |
| #ifndef PRODUCT |
| |
| class TestMetaspaceAuxTest : AllStatic { |
| public: |
| static void test_reserved() { |
| size_t reserved = MetaspaceAux::reserved_bytes(); |
| |
| assert(reserved > 0, "assert"); |
| |
| size_t committed = MetaspaceAux::committed_bytes(); |
| assert(committed <= reserved, "assert"); |
| |
| size_t reserved_metadata = MetaspaceAux::reserved_bytes(Metaspace::NonClassType); |
| assert(reserved_metadata > 0, "assert"); |
| assert(reserved_metadata <= reserved, "assert"); |
| |
| if (UseCompressedClassPointers) { |
| size_t reserved_class = MetaspaceAux::reserved_bytes(Metaspace::ClassType); |
| assert(reserved_class > 0, "assert"); |
| assert(reserved_class < reserved, "assert"); |
| } |
| } |
| |
| static void test_committed() { |
| size_t committed = MetaspaceAux::committed_bytes(); |
| |
| assert(committed > 0, "assert"); |
| |
| size_t reserved = MetaspaceAux::reserved_bytes(); |
| assert(committed <= reserved, "assert"); |
| |
| size_t committed_metadata = MetaspaceAux::committed_bytes(Metaspace::NonClassType); |
| assert(committed_metadata > 0, "assert"); |
| assert(committed_metadata <= committed, "assert"); |
| |
| if (UseCompressedClassPointers) { |
| size_t committed_class = MetaspaceAux::committed_bytes(Metaspace::ClassType); |
| assert(committed_class > 0, "assert"); |
| assert(committed_class < committed, "assert"); |
| } |
| } |
| |
| static void test_virtual_space_list_large_chunk() { |
| VirtualSpaceList* vs_list = new VirtualSpaceList(os::vm_allocation_granularity()); |
| MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag); |
| // A size larger than VirtualSpaceSize (256k) and add one page to make it _not_ be |
| // vm_allocation_granularity aligned on Windows. |
| size_t large_size = (size_t)(2*256*K + (os::vm_page_size()/BytesPerWord)); |
| large_size += (os::vm_page_size()/BytesPerWord); |
| vs_list->get_new_chunk(large_size, 0); |
| } |
| |
| static void test() { |
| test_reserved(); |
| test_committed(); |
| test_virtual_space_list_large_chunk(); |
| } |
| }; |
| |
| void TestMetaspaceAux_test() { |
| TestMetaspaceAuxTest::test(); |
| } |
| |
| class TestVirtualSpaceNodeTest { |
| static void chunk_up(size_t words_left, size_t& num_medium_chunks, |
| size_t& num_small_chunks, |
| size_t& num_specialized_chunks) { |
| num_medium_chunks = words_left / MediumChunk; |
| words_left = words_left % MediumChunk; |
| |
| num_small_chunks = words_left / SmallChunk; |
| words_left = words_left % SmallChunk; |
| // how many specialized chunks can we get? |
| num_specialized_chunks = words_left / SpecializedChunk; |
| assert(words_left % SpecializedChunk == 0, "should be nothing left"); |
| } |
| |
| public: |
| static void test() { |
| MutexLockerEx ml(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag); |
| const size_t vsn_test_size_words = MediumChunk * 4; |
| const size_t vsn_test_size_bytes = vsn_test_size_words * BytesPerWord; |
| |
| // The chunk sizes must be multiples of eachother, or this will fail |
| STATIC_ASSERT(MediumChunk % SmallChunk == 0); |
| STATIC_ASSERT(SmallChunk % SpecializedChunk == 0); |
| |
| { // No committed memory in VSN |
| ChunkManager cm(SpecializedChunk, SmallChunk, MediumChunk); |
| VirtualSpaceNode vsn(vsn_test_size_bytes); |
| vsn.initialize(); |
| vsn.retire(&cm); |
| assert(cm.sum_free_chunks_count() == 0, "did not commit any memory in the VSN"); |
| } |
| |
| { // All of VSN is committed, half is used by chunks |
| ChunkManager cm(SpecializedChunk, SmallChunk, MediumChunk); |
| VirtualSpaceNode vsn(vsn_test_size_bytes); |
| vsn.initialize(); |
| vsn.expand_by(vsn_test_size_words, vsn_test_size_words); |
| vsn.get_chunk_vs(MediumChunk); |
| vsn.get_chunk_vs(MediumChunk); |
| vsn.retire(&cm); |
| assert(cm.sum_free_chunks_count() == 2, "should have been memory left for 2 medium chunks"); |
| assert(cm.sum_free_chunks() == 2*MediumChunk, "sizes should add up"); |
| } |
| |
| const size_t page_chunks = 4 * (size_t)os::vm_page_size() / BytesPerWord; |
| // This doesn't work for systems with vm_page_size >= 16K. |
| if (page_chunks < MediumChunk) { |
| // 4 pages of VSN is committed, some is used by chunks |
| ChunkManager cm(SpecializedChunk, SmallChunk, MediumChunk); |
| VirtualSpaceNode vsn(vsn_test_size_bytes); |
| |
| vsn.initialize(); |
| vsn.expand_by(page_chunks, page_chunks); |
| vsn.get_chunk_vs(SmallChunk); |
| vsn.get_chunk_vs(SpecializedChunk); |
| vsn.retire(&cm); |
| |
| // committed - used = words left to retire |
| const size_t words_left = page_chunks - SmallChunk - SpecializedChunk; |
| |
| size_t num_medium_chunks, num_small_chunks, num_spec_chunks; |
| chunk_up(words_left, num_medium_chunks, num_small_chunks, num_spec_chunks); |
| |
| assert(num_medium_chunks == 0, "should not get any medium chunks"); |
| assert(cm.sum_free_chunks_count() == (num_small_chunks + num_spec_chunks), "should be space for 3 chunks"); |
| assert(cm.sum_free_chunks() == words_left, "sizes should add up"); |
| } |
| |
| { // Half of VSN is committed, a humongous chunk is used |
| ChunkManager cm(SpecializedChunk, SmallChunk, MediumChunk); |
| VirtualSpaceNode vsn(vsn_test_size_bytes); |
| vsn.initialize(); |
| vsn.expand_by(MediumChunk * 2, MediumChunk * 2); |
| vsn.get_chunk_vs(MediumChunk + SpecializedChunk); // Humongous chunks will be aligned up to MediumChunk + SpecializedChunk |
| vsn.retire(&cm); |
| |
| const size_t words_left = MediumChunk * 2 - (MediumChunk + SpecializedChunk); |
| size_t num_medium_chunks, num_small_chunks, num_spec_chunks; |
| chunk_up(words_left, num_medium_chunks, num_small_chunks, num_spec_chunks); |
| |
| assert(num_medium_chunks == 0, "should not get any medium chunks"); |
| assert(cm.sum_free_chunks_count() == (num_small_chunks + num_spec_chunks), "should be space for 3 chunks"); |
| assert(cm.sum_free_chunks() == words_left, "sizes should add up"); |
| } |
| |
| } |
| |
| #define assert_is_available_positive(word_size) \ |
| assert(vsn.is_available(word_size), \ |
| #word_size ": " PTR_FORMAT " bytes were not available in " \ |
| "VirtualSpaceNode [" PTR_FORMAT ", " PTR_FORMAT ")", \ |
| (uintptr_t)(word_size * BytesPerWord), p2i(vsn.bottom()), p2i(vsn.end())); |
| |
| #define assert_is_available_negative(word_size) \ |
| assert(!vsn.is_available(word_size), \ |
| #word_size ": " PTR_FORMAT " bytes should not be available in " \ |
| "VirtualSpaceNode [" PTR_FORMAT ", " PTR_FORMAT ")", \ |
| (uintptr_t)(word_size * BytesPerWord), p2i(vsn.bottom()), p2i(vsn.end())); |
| |
| static void test_is_available_positive() { |
| // Reserve some memory. |
| VirtualSpaceNode vsn(os::vm_allocation_granularity()); |
| assert(vsn.initialize(), "Failed to setup VirtualSpaceNode"); |
| |
| // Commit some memory. |
| size_t commit_word_size = os::vm_allocation_granularity() / BytesPerWord; |
| bool expanded = vsn.expand_by(commit_word_size, commit_word_size); |
| assert(expanded, "Failed to commit"); |
| |
| // Check that is_available accepts the committed size. |
| assert_is_available_positive(commit_word_size); |
| |
| // Check that is_available accepts half the committed size. |
| size_t expand_word_size = commit_word_size / 2; |
| assert_is_available_positive(expand_word_size); |
| } |
| |
| static void test_is_available_negative() { |
| // Reserve some memory. |
| VirtualSpaceNode vsn(os::vm_allocation_granularity()); |
| assert(vsn.initialize(), "Failed to setup VirtualSpaceNode"); |
| |
| // Commit some memory. |
| size_t commit_word_size = os::vm_allocation_granularity() / BytesPerWord; |
| bool expanded = vsn.expand_by(commit_word_size, commit_word_size); |
| assert(expanded, "Failed to commit"); |
| |
| // Check that is_available doesn't accept a too large size. |
| size_t two_times_commit_word_size = commit_word_size * 2; |
| assert_is_available_negative(two_times_commit_word_size); |
| } |
| |
| static void test_is_available_overflow() { |
| // Reserve some memory. |
| VirtualSpaceNode vsn(os::vm_allocation_granularity()); |
| assert(vsn.initialize(), "Failed to setup VirtualSpaceNode"); |
| |
| // Commit some memory. |
| size_t commit_word_size = os::vm_allocation_granularity() / BytesPerWord; |
| bool expanded = vsn.expand_by(commit_word_size, commit_word_size); |
| assert(expanded, "Failed to commit"); |
| |
| // Calculate a size that will overflow the virtual space size. |
| void* virtual_space_max = (void*)(uintptr_t)-1; |
| size_t bottom_to_max = pointer_delta(virtual_space_max, vsn.bottom(), 1); |
| size_t overflow_size = bottom_to_max + BytesPerWord; |
| size_t overflow_word_size = overflow_size / BytesPerWord; |
| |
| // Check that is_available can handle the overflow. |
| assert_is_available_negative(overflow_word_size); |
| } |
| |
| static void test_is_available() { |
| TestVirtualSpaceNodeTest::test_is_available_positive(); |
| TestVirtualSpaceNodeTest::test_is_available_negative(); |
| TestVirtualSpaceNodeTest::test_is_available_overflow(); |
| } |
| }; |
| |
| void TestVirtualSpaceNode_test() { |
| TestVirtualSpaceNodeTest::test(); |
| TestVirtualSpaceNodeTest::test_is_available(); |
| } |
| |
| // The following test is placed here instead of a gtest / unittest file |
| // because the ChunkManager class is only available in this file. |
| void ChunkManager_test_list_index() { |
| ChunkManager manager(ClassSpecializedChunk, ClassSmallChunk, ClassMediumChunk); |
| |
| // Test previous bug where a query for a humongous class metachunk, |
| // incorrectly matched the non-class medium metachunk size. |
| { |
| assert(MediumChunk > ClassMediumChunk, "Precondition for test"); |
| |
| ChunkIndex index = manager.list_index(MediumChunk); |
| |
| assert(index == HumongousIndex, |
| "Requested size is larger than ClassMediumChunk," |
| " so should return HumongousIndex. Got index: %d", (int)index); |
| } |
| |
| // Check the specified sizes as well. |
| { |
| ChunkIndex index = manager.list_index(ClassSpecializedChunk); |
| assert(index == SpecializedIndex, "Wrong index returned. Got index: %d", (int)index); |
| } |
| { |
| ChunkIndex index = manager.list_index(ClassSmallChunk); |
| assert(index == SmallIndex, "Wrong index returned. Got index: %d", (int)index); |
| } |
| { |
| ChunkIndex index = manager.list_index(ClassMediumChunk); |
| assert(index == MediumIndex, "Wrong index returned. Got index: %d", (int)index); |
| } |
| { |
| ChunkIndex index = manager.list_index(ClassMediumChunk + 1); |
| assert(index == HumongousIndex, "Wrong index returned. Got index: %d", (int)index); |
| } |
| } |
| |
| |
| // The following test is placed here instead of a gtest / unittest file |
| // because the ChunkManager class is only available in this file. |
| class SpaceManagerTest : AllStatic { |
| friend void SpaceManager_test_adjust_initial_chunk_size(); |
| |
| static void test_adjust_initial_chunk_size(bool is_class) { |
| const size_t smallest = SpaceManager::smallest_chunk_size(is_class); |
| const size_t normal = SpaceManager::small_chunk_size(is_class); |
| const size_t medium = SpaceManager::medium_chunk_size(is_class); |
| |
| #define test_adjust_initial_chunk_size(value, expected, is_class_value) \ |
| do { \ |
| size_t v = value; \ |
| size_t e = expected; \ |
| assert(SpaceManager::adjust_initial_chunk_size(v, (is_class_value)) == e, \ |
| "Expected: " SIZE_FORMAT " got: " SIZE_FORMAT, e, v); \ |
| } while (0) |
| |
| // Smallest (specialized) |
| test_adjust_initial_chunk_size(1, smallest, is_class); |
| test_adjust_initial_chunk_size(smallest - 1, smallest, is_class); |
| test_adjust_initial_chunk_size(smallest, smallest, is_class); |
| |
| // Small |
| test_adjust_initial_chunk_size(smallest + 1, normal, is_class); |
| test_adjust_initial_chunk_size(normal - 1, normal, is_class); |
| test_adjust_initial_chunk_size(normal, normal, is_class); |
| |
| // Medium |
| test_adjust_initial_chunk_size(normal + 1, medium, is_class); |
| test_adjust_initial_chunk_size(medium - 1, medium, is_class); |
| test_adjust_initial_chunk_size(medium, medium, is_class); |
| |
| // Humongous |
| test_adjust_initial_chunk_size(medium + 1, medium + 1, is_class); |
| |
| #undef test_adjust_initial_chunk_size |
| } |
| |
| static void test_adjust_initial_chunk_size() { |
| test_adjust_initial_chunk_size(false); |
| test_adjust_initial_chunk_size(true); |
| } |
| }; |
| |
| void SpaceManager_test_adjust_initial_chunk_size() { |
| SpaceManagerTest::test_adjust_initial_chunk_size(); |
| } |
| |
| #endif |