--- /dev/null 2018-05-09 06:13:36.966491568 +0200 +++ new/src/hotspot/share/memory/metaspace/spaceManager.hpp 2018-05-09 12:24:48.175702077 +0200 @@ -0,0 +1,235 @@ +/* + * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + * + */ + +#ifndef SHARE_MEMORY_METASPACE_SPACEMANAGER_HPP_ +#define SHARE_MEMORY_METASPACE_SPACEMANAGER_HPP_ + +#include "memory/allocation.hpp" +#include "memory/metaspace.hpp" +#include "memory/metaspace/blockFreelist.hpp" +#include "memory/metaspace/metaspaceCommon.hpp" +#include "memory/metaspace/metachunk.hpp" +#include "memory/metaspace/metaspaceStatistics.hpp" +#include "utilities/debug.hpp" +#include "utilities/globalDefinitions.hpp" + +class outputStream; +class Mutex; + +namespace metaspace { +namespace internals { + +// SpaceManager - used by Metaspace to handle allocations +class SpaceManager : public CHeapObj { + friend class ::ClassLoaderMetaspace; + friend class Metadebug; + + private: + + // protects allocations + Mutex* const _lock; + + // Type of metadata allocated. + const Metaspace::MetadataType _mdtype; + + // Type of metaspace + const Metaspace::MetaspaceType _space_type; + + // 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* _chunk_list; + Metachunk* _current_chunk; + + enum { + + // Maximum number of small chunks to allocate to a SpaceManager + small_chunk_limit = 4, + + // Maximum number of specialize chunks to allocate for anonymous and delegating + // metadata space to a SpaceManager + anon_and_delegating_metadata_specialize_chunk_limit = 4, + + allocation_from_dictionary_limit = 4 * K + + }; + + // Some running counters, but lets keep their number small to not add to much to + // the per-classloader footprint. + // Note: capacity = used + free + waste + overhead. We do not keep running counters for + // free and waste. Their sum can be deduced from the three other values. + size_t _overhead_words; + size_t _capacity_words; + size_t _used_words; + uintx _num_chunks_by_type[NumberOfInUseLists]; + + // 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; + + private: + // Accessors + Metachunk* chunk_list() const { return _chunk_list; } + + 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; } + + // Adds to the given statistic object. Expects to be locked with lock(). + void add_to_statistics_locked(SpaceManagerStatistics* out) const; + + // Verify internal counters against the current state. Expects to be locked with lock(). + DEBUG_ONLY(void verify_metrics_locked() const;) + + public: + SpaceManager(Metaspace::MetadataType mdtype, + Metaspace::MetaspaceType space_type, + 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; } + + bool is_humongous(size_t word_size) { return word_size > medium_chunk_size(); } + + size_t capacity_words() const { return _capacity_words; } + size_t used_words() const { return _used_words; } + size_t overhead_words() const { return _overhead_words; } + + // Adjust local, global counters after a new chunk has been added. + void account_for_new_chunk(const Metachunk* new_chunk); + + // Adjust local, global counters after space has been allocated from the current chunk. + void account_for_allocation(size_t words); + + // Adjust global counters just before the SpaceManager dies, after all its chunks + // have been returned to the freelist. + void account_for_spacemanager_death(); + + // 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; + + // Todo: remove this once we have counters by chunk type. + uintx num_chunks_by_type(ChunkIndex chunk_type) const { return _num_chunks_by_type[chunk_type]; } + + Metachunk* get_new_chunk(size_t chunk_word_size); + + // Block allocation and deallocation. + // Allocates a block from the current chunk + MetaWord* allocate(size_t word_size); + + // Helper for allocations + MetaWord* allocate_work(size_t word_size); + + // Returns a block to the per manager freelist + void deallocate(MetaWord* p, size_t word_size); + + // Based on the allocation size and a minimum chunk size, + // returned chunk size (for expanding space for chunk allocation). + size_t calc_chunk_size(size_t allocation_word_size); + + // Called when an allocation from the current chunk fails. + // Gets a new chunk (may require getting a new virtual space), + // and allocates from that chunk. + MetaWord* grow_and_allocate(size_t word_size); + + // Notify memory usage to MemoryService. + void track_metaspace_memory_usage(); + + // debugging support. + + void print_on(outputStream* st) const; + void locked_print_chunks_in_use_on(outputStream* st) const; + + void verify(); + void verify_chunk_size(Metachunk* chunk); + + // 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_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; + } + + // Adds to the given statistic object. + void add_to_statistics(SpaceManagerStatistics* out) const; + + // Verify internal counters against the current state. + DEBUG_ONLY(void verify_metrics() const;) + +}; + + +} // namespace metaspace +} // namespace internals + +#endif /* SHARE_MEMORY_METASPACE_SPACEMANAGER_HPP_ */