author | ccheung |
Thu, 12 Sep 2019 09:59:19 -0700 | |
changeset 58110 | 85e1de070bef |
parent 53244 | 9807daeb47c4 |
child 57464 | 32e61f51ee09 |
child 58063 | bdf136b8ae0e |
permissions | -rw-r--r-- |
50193 | 1 |
/* |
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* Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#ifndef SHARE_MEMORY_METASPACE_SPACEMANAGER_HPP |
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#define SHARE_MEMORY_METASPACE_SPACEMANAGER_HPP |
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#include "memory/allocation.hpp" |
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#include "memory/metaspace.hpp" |
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#include "memory/metaspace/blockFreelist.hpp" |
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#include "memory/metaspace/metaspaceCommon.hpp" |
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#include "memory/metaspace/metachunk.hpp" |
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#include "memory/metaspace/metaspaceStatistics.hpp" |
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#include "utilities/debug.hpp" |
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#include "utilities/globalDefinitions.hpp" |
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class outputStream; |
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class Mutex; |
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namespace metaspace { |
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// SpaceManager - used by Metaspace to handle allocations |
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class SpaceManager : public CHeapObj<mtClass> { |
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friend class ::ClassLoaderMetaspace; |
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friend class Metadebug; |
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private: |
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// protects allocations |
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Mutex* const _lock; |
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// Type of metadata allocated. |
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const Metaspace::MetadataType _mdtype; |
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// Type of metaspace |
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const Metaspace::MetaspaceType _space_type; |
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// List of chunks in use by this SpaceManager. Allocations |
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// are done from the current chunk. The list is used for deallocating |
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// chunks when the SpaceManager is freed. |
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Metachunk* _chunk_list; |
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Metachunk* _current_chunk; |
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enum { |
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// Maximum number of small chunks to allocate to a SpaceManager |
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small_chunk_limit = 4, |
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// Maximum number of specialize chunks to allocate for anonymous and delegating |
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// metadata space to a SpaceManager |
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anon_and_delegating_metadata_specialize_chunk_limit = 4, |
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allocation_from_dictionary_limit = 4 * K |
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}; |
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// Some running counters, but lets keep their number small to not add to much to |
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// the per-classloader footprint. |
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// Note: capacity = used + free + waste + overhead. We do not keep running counters for |
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// free and waste. Their sum can be deduced from the three other values. |
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size_t _overhead_words; |
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size_t _capacity_words; |
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size_t _used_words; |
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uintx _num_chunks_by_type[NumberOfInUseLists]; |
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// Free lists of blocks are per SpaceManager since they |
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// are assumed to be in chunks in use by the SpaceManager |
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// and all chunks in use by a SpaceManager are freed when |
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// the class loader using the SpaceManager is collected. |
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BlockFreelist* _block_freelists; |
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private: |
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// Accessors |
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Metachunk* chunk_list() const { return _chunk_list; } |
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BlockFreelist* block_freelists() const { return _block_freelists; } |
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Metaspace::MetadataType mdtype() { return _mdtype; } |
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VirtualSpaceList* vs_list() const { return Metaspace::get_space_list(_mdtype); } |
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ChunkManager* chunk_manager() const { return Metaspace::get_chunk_manager(_mdtype); } |
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Metachunk* current_chunk() const { return _current_chunk; } |
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void set_current_chunk(Metachunk* v) { |
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_current_chunk = v; |
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} |
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Metachunk* find_current_chunk(size_t word_size); |
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// Add chunk to the list of chunks in use |
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void add_chunk(Metachunk* v, bool make_current); |
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void retire_current_chunk(); |
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Mutex* lock() const { return _lock; } |
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// Adds to the given statistic object. Expects to be locked with lock(). |
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void add_to_statistics_locked(SpaceManagerStatistics* out) const; |
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// Verify internal counters against the current state. Expects to be locked with lock(). |
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DEBUG_ONLY(void verify_metrics_locked() const;) |
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public: |
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SpaceManager(Metaspace::MetadataType mdtype, |
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Metaspace::MetaspaceType space_type, |
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Mutex* lock); |
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~SpaceManager(); |
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enum ChunkMultiples { |
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MediumChunkMultiple = 4 |
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}; |
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static size_t specialized_chunk_size(bool is_class) { return is_class ? ClassSpecializedChunk : SpecializedChunk; } |
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static size_t small_chunk_size(bool is_class) { return is_class ? ClassSmallChunk : SmallChunk; } |
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static size_t medium_chunk_size(bool is_class) { return is_class ? ClassMediumChunk : MediumChunk; } |
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static size_t smallest_chunk_size(bool is_class) { return specialized_chunk_size(is_class); } |
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// Accessors |
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bool is_class() const { return _mdtype == Metaspace::ClassType; } |
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size_t specialized_chunk_size() const { return specialized_chunk_size(is_class()); } |
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size_t small_chunk_size() const { return small_chunk_size(is_class()); } |
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size_t medium_chunk_size() const { return medium_chunk_size(is_class()); } |
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size_t smallest_chunk_size() const { return smallest_chunk_size(is_class()); } |
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size_t medium_chunk_bunch() const { return medium_chunk_size() * MediumChunkMultiple; } |
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bool is_humongous(size_t word_size) { return word_size > medium_chunk_size(); } |
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size_t capacity_words() const { return _capacity_words; } |
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size_t used_words() const { return _used_words; } |
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size_t overhead_words() const { return _overhead_words; } |
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// Adjust local, global counters after a new chunk has been added. |
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void account_for_new_chunk(const Metachunk* new_chunk); |
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// Adjust local, global counters after space has been allocated from the current chunk. |
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void account_for_allocation(size_t words); |
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// Adjust global counters just before the SpaceManager dies, after all its chunks |
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// have been returned to the freelist. |
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void account_for_spacemanager_death(); |
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// Adjust the initial chunk size to match one of the fixed chunk list sizes, |
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// or return the unadjusted size if the requested size is humongous. |
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static size_t adjust_initial_chunk_size(size_t requested, bool is_class_space); |
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size_t adjust_initial_chunk_size(size_t requested) const; |
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// Get the initial chunks size for this metaspace type. |
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size_t get_initial_chunk_size(Metaspace::MetaspaceType type) const; |
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// Todo: remove this once we have counters by chunk type. |
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uintx num_chunks_by_type(ChunkIndex chunk_type) const { return _num_chunks_by_type[chunk_type]; } |
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Metachunk* get_new_chunk(size_t chunk_word_size); |
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// Block allocation and deallocation. |
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// Allocates a block from the current chunk |
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MetaWord* allocate(size_t word_size); |
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// Helper for allocations |
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MetaWord* allocate_work(size_t word_size); |
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// Returns a block to the per manager freelist |
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void deallocate(MetaWord* p, size_t word_size); |
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// Based on the allocation size and a minimum chunk size, |
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// returned chunk size (for expanding space for chunk allocation). |
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size_t calc_chunk_size(size_t allocation_word_size); |
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// Called when an allocation from the current chunk fails. |
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// Gets a new chunk (may require getting a new virtual space), |
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// and allocates from that chunk. |
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MetaWord* grow_and_allocate(size_t word_size); |
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// Notify memory usage to MemoryService. |
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void track_metaspace_memory_usage(); |
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// debugging support. |
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void print_on(outputStream* st) const; |
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void locked_print_chunks_in_use_on(outputStream* st) const; |
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void verify(); |
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void verify_chunk_size(Metachunk* chunk); |
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// This adjusts the size given to be greater than the minimum allocation size in |
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// words for data in metaspace. Esentially the minimum size is currently 3 words. |
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size_t get_allocation_word_size(size_t word_size) { |
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size_t byte_size = word_size * BytesPerWord; |
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size_t raw_bytes_size = MAX2(byte_size, sizeof(Metablock)); |
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raw_bytes_size = align_up(raw_bytes_size, Metachunk::object_alignment()); |
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size_t raw_word_size = raw_bytes_size / BytesPerWord; |
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assert(raw_word_size * BytesPerWord == raw_bytes_size, "Size problem"); |
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return raw_word_size; |
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} |
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// Adds to the given statistic object. |
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void add_to_statistics(SpaceManagerStatistics* out) const; |
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// Verify internal counters against the current state. |
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DEBUG_ONLY(void verify_metrics() const;) |
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}; |
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} // namespace metaspace |
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53244
9807daeb47c4
8216167: Update include guards to reflect correct directories
coleenp
parents:
50193
diff
changeset
|
233 |
#endif // SHARE_MEMORY_METASPACE_SPACEMANAGER_HPP |