| /* |
| * Copyright (c) 2011, 2017, 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_VM_MEMORY_METASPACE_HPP |
| #define SHARE_VM_MEMORY_METASPACE_HPP |
| |
| #include "memory/allocation.hpp" |
| #include "memory/memRegion.hpp" |
| #include "memory/metaspaceChunkFreeListSummary.hpp" |
| #include "memory/virtualspace.hpp" |
| #include "utilities/exceptions.hpp" |
| |
| // Metaspace |
| // |
| // Metaspaces are Arenas for the VM's metadata. |
| // They are allocated one per class loader object, and one for the null |
| // bootstrap class loader |
| // |
| // block X ---+ +-------------------+ |
| // | | Virtualspace | |
| // | | | |
| // | | | |
| // | |-------------------| |
| // | || Chunk | |
| // | || | |
| // | ||---------- | |
| // +------>||| block 0 | | |
| // ||---------- | |
| // ||| block 1 | | |
| // ||---------- | |
| // || | |
| // |-------------------| |
| // | | |
| // | | |
| // +-------------------+ |
| // |
| |
| class ClassLoaderData; |
| class MetaspaceTracer; |
| class MetaWord; |
| class Mutex; |
| class outputStream; |
| |
| class CollectedHeap; |
| |
| namespace metaspace { |
| class ChunkManager; |
| class ClassLoaderMetaspaceStatistics; |
| class Metablock; |
| class Metachunk; |
| class PrintCLDMetaspaceInfoClosure; |
| class SpaceManager; |
| class VirtualSpaceList; |
| } |
| |
| // Metaspaces each have a SpaceManager and allocations |
| // are done by the SpaceManager. Allocations are done |
| // out of the current Metachunk. When the current Metachunk |
| // is exhausted, the SpaceManager gets a new one from |
| // the current VirtualSpace. When the VirtualSpace is exhausted |
| // the SpaceManager gets a new one. The SpaceManager |
| // also manages freelists of available Chunks. |
| // |
| // Currently the space manager maintains the list of |
| // virtual spaces and the list of chunks in use. Its |
| // allocate() method returns a block for use as a |
| // quantum of metadata. |
| |
| // Namespace for important central static functions |
| // (auxiliary stuff goes into MetaspaceUtils) |
| class Metaspace : public AllStatic { |
| |
| friend class MetaspaceShared; |
| |
| public: |
| enum MetadataType { |
| ClassType, |
| NonClassType, |
| MetadataTypeCount |
| }; |
| enum MetaspaceType { |
| ZeroMetaspaceType = 0, |
| StandardMetaspaceType = ZeroMetaspaceType, |
| BootMetaspaceType = StandardMetaspaceType + 1, |
| UnsafeAnonymousMetaspaceType = BootMetaspaceType + 1, |
| ReflectionMetaspaceType = UnsafeAnonymousMetaspaceType + 1, |
| MetaspaceTypeCount |
| }; |
| |
| private: |
| |
| // Align up the word size to the allocation word size |
| static size_t align_word_size_up(size_t); |
| |
| // Aligned size of the metaspace. |
| static size_t _compressed_class_space_size; |
| |
| static size_t compressed_class_space_size() { |
| return _compressed_class_space_size; |
| } |
| |
| static void set_compressed_class_space_size(size_t size) { |
| _compressed_class_space_size = size; |
| } |
| |
| static size_t _first_chunk_word_size; |
| static size_t _first_class_chunk_word_size; |
| |
| static size_t _commit_alignment; |
| static size_t _reserve_alignment; |
| DEBUG_ONLY(static bool _frozen;) |
| |
| // Virtual Space lists for both classes and other metadata |
| static metaspace::VirtualSpaceList* _space_list; |
| static metaspace::VirtualSpaceList* _class_space_list; |
| |
| static metaspace::ChunkManager* _chunk_manager_metadata; |
| static metaspace::ChunkManager* _chunk_manager_class; |
| |
| static const MetaspaceTracer* _tracer; |
| |
| public: |
| static metaspace::VirtualSpaceList* space_list() { return _space_list; } |
| static metaspace::VirtualSpaceList* class_space_list() { return _class_space_list; } |
| static metaspace::VirtualSpaceList* get_space_list(MetadataType mdtype) { |
| assert(mdtype != MetadataTypeCount, "MetadaTypeCount can't be used as mdtype"); |
| return mdtype == ClassType ? class_space_list() : space_list(); |
| } |
| |
| static metaspace::ChunkManager* chunk_manager_metadata() { return _chunk_manager_metadata; } |
| static metaspace::ChunkManager* chunk_manager_class() { return _chunk_manager_class; } |
| static metaspace::ChunkManager* get_chunk_manager(MetadataType mdtype) { |
| assert(mdtype != MetadataTypeCount, "MetadaTypeCount can't be used as mdtype"); |
| return mdtype == ClassType ? chunk_manager_class() : chunk_manager_metadata(); |
| } |
| |
| // convenience function |
| static metaspace::ChunkManager* get_chunk_manager(bool is_class) { |
| return is_class ? chunk_manager_class() : chunk_manager_metadata(); |
| } |
| |
| static const MetaspaceTracer* tracer() { return _tracer; } |
| static void freeze() { |
| assert(DumpSharedSpaces, "sanity"); |
| DEBUG_ONLY(_frozen = true;) |
| } |
| static void assert_not_frozen() { |
| assert(!_frozen, "sanity"); |
| } |
| #ifdef _LP64 |
| static void allocate_metaspace_compressed_klass_ptrs(char* requested_addr, address cds_base); |
| #endif |
| |
| private: |
| |
| #ifdef _LP64 |
| static void set_narrow_klass_base_and_shift(address metaspace_base, address cds_base); |
| |
| // Returns true if can use CDS with metaspace allocated as specified address. |
| static bool can_use_cds_with_metaspace_addr(char* metaspace_base, address cds_base); |
| |
| static void initialize_class_space(ReservedSpace rs); |
| #endif |
| |
| public: |
| |
| static void ergo_initialize(); |
| static void global_initialize(); |
| static void post_initialize(); |
| |
| static void verify_global_initialization(); |
| |
| static size_t first_chunk_word_size() { return _first_chunk_word_size; } |
| static size_t first_class_chunk_word_size() { return _first_class_chunk_word_size; } |
| |
| static size_t reserve_alignment() { return _reserve_alignment; } |
| static size_t reserve_alignment_words() { return _reserve_alignment / BytesPerWord; } |
| static size_t commit_alignment() { return _commit_alignment; } |
| static size_t commit_alignment_words() { return _commit_alignment / BytesPerWord; } |
| |
| static MetaWord* allocate(ClassLoaderData* loader_data, size_t word_size, |
| MetaspaceObj::Type type, TRAPS); |
| |
| static bool contains(const void* ptr); |
| static bool contains_non_shared(const void* ptr); |
| |
| // Free empty virtualspaces |
| static void purge(MetadataType mdtype); |
| static void purge(); |
| |
| static void report_metadata_oome(ClassLoaderData* loader_data, size_t word_size, |
| MetaspaceObj::Type type, MetadataType mdtype, TRAPS); |
| |
| static const char* metadata_type_name(Metaspace::MetadataType mdtype); |
| |
| static void print_compressed_class_space(outputStream* st, const char* requested_addr = 0) NOT_LP64({}); |
| |
| // Return TRUE only if UseCompressedClassPointers is True. |
| static bool using_class_space() { |
| return NOT_LP64(false) LP64_ONLY(UseCompressedClassPointers); |
| } |
| |
| static bool is_class_space_allocation(MetadataType mdType) { |
| return mdType == ClassType && using_class_space(); |
| } |
| |
| }; |
| |
| // Manages the metaspace portion belonging to a class loader |
| class ClassLoaderMetaspace : public CHeapObj<mtClass> { |
| friend class CollectedHeap; // For expand_and_allocate() |
| friend class ZCollectedHeap; // For expand_and_allocate() |
| friend class Metaspace; |
| friend class MetaspaceUtils; |
| friend class metaspace::PrintCLDMetaspaceInfoClosure; |
| friend class VM_CollectForMetadataAllocation; // For expand_and_allocate() |
| |
| private: |
| |
| void initialize(Mutex* lock, Metaspace::MetaspaceType type); |
| |
| // Initialize the first chunk for a Metaspace. Used for |
| // special cases such as the boot class loader, reflection |
| // class loader and anonymous class loader. |
| void initialize_first_chunk(Metaspace::MetaspaceType type, Metaspace::MetadataType mdtype); |
| metaspace::Metachunk* get_initialization_chunk(Metaspace::MetaspaceType type, Metaspace::MetadataType mdtype); |
| |
| const Metaspace::MetaspaceType _space_type; |
| Mutex* const _lock; |
| metaspace::SpaceManager* _vsm; |
| metaspace::SpaceManager* _class_vsm; |
| |
| metaspace::SpaceManager* vsm() const { return _vsm; } |
| metaspace::SpaceManager* class_vsm() const { return _class_vsm; } |
| metaspace::SpaceManager* get_space_manager(Metaspace::MetadataType mdtype) { |
| assert(mdtype != Metaspace::MetadataTypeCount, "MetadaTypeCount can't be used as mdtype"); |
| return mdtype == Metaspace::ClassType ? class_vsm() : vsm(); |
| } |
| |
| Mutex* lock() const { return _lock; } |
| |
| MetaWord* expand_and_allocate(size_t size, Metaspace::MetadataType mdtype); |
| |
| size_t class_chunk_size(size_t word_size); |
| |
| // Adds to the given statistic object. Must be locked with CLD metaspace lock. |
| void add_to_statistics_locked(metaspace::ClassLoaderMetaspaceStatistics* out) const; |
| |
| Metaspace::MetaspaceType space_type() const { return _space_type; } |
| |
| public: |
| |
| ClassLoaderMetaspace(Mutex* lock, Metaspace::MetaspaceType type); |
| ~ClassLoaderMetaspace(); |
| |
| // Allocate space for metadata of type mdtype. This is space |
| // within a Metachunk and is used by |
| // allocate(ClassLoaderData*, size_t, bool, MetadataType, TRAPS) |
| MetaWord* allocate(size_t word_size, Metaspace::MetadataType mdtype); |
| |
| size_t allocated_blocks_bytes() const; |
| size_t allocated_chunks_bytes() const; |
| |
| void deallocate(MetaWord* ptr, size_t byte_size, bool is_class); |
| |
| void print_on(outputStream* st) const; |
| // Debugging support |
| void verify(); |
| |
| // Adds to the given statistic object. Will lock with CLD metaspace lock. |
| void add_to_statistics(metaspace::ClassLoaderMetaspaceStatistics* out) const; |
| |
| }; // ClassLoaderMetaspace |
| |
| class MetaspaceUtils : AllStatic { |
| |
| // Spacemanager updates running counters. |
| friend class metaspace::SpaceManager; |
| |
| // Running counters for statistics concerning in-use chunks. |
| // Note: capacity = used + free + waste + overhead. Note that we do not |
| // count free and waste. Their sum can be deduces from the three other values. |
| // For more details, one should call print_report() from within a safe point. |
| static size_t _capacity_words [Metaspace:: MetadataTypeCount]; |
| static size_t _overhead_words [Metaspace:: MetadataTypeCount]; |
| static volatile size_t _used_words [Metaspace:: MetadataTypeCount]; |
| |
| // Atomically decrement or increment in-use statistic counters |
| static void dec_capacity(Metaspace::MetadataType mdtype, size_t words); |
| static void inc_capacity(Metaspace::MetadataType mdtype, size_t words); |
| static void dec_used(Metaspace::MetadataType mdtype, size_t words); |
| static void inc_used(Metaspace::MetadataType mdtype, size_t words); |
| static void dec_overhead(Metaspace::MetadataType mdtype, size_t words); |
| static void inc_overhead(Metaspace::MetadataType mdtype, size_t words); |
| |
| |
| // Getters for the in-use counters. |
| static size_t capacity_words(Metaspace::MetadataType mdtype) { return _capacity_words[mdtype]; } |
| static size_t used_words(Metaspace::MetadataType mdtype) { return _used_words[mdtype]; } |
| static size_t overhead_words(Metaspace::MetadataType mdtype) { return _overhead_words[mdtype]; } |
| |
| static size_t free_chunks_total_words(Metaspace::MetadataType mdtype); |
| |
| // Helper for print_xx_report. |
| static void print_vs(outputStream* out, size_t scale); |
| |
| public: |
| |
| // Collect used metaspace statistics. This involves walking the CLDG. The resulting |
| // output will be the accumulated values for all live metaspaces. |
| // Note: method does not do any locking. |
| static void collect_statistics(metaspace::ClassLoaderMetaspaceStatistics* out); |
| |
| // Used by MetaspaceCounters |
| static size_t free_chunks_total_words(); |
| static size_t free_chunks_total_bytes(); |
| static size_t free_chunks_total_bytes(Metaspace::MetadataType mdtype); |
| |
| static size_t capacity_words() { |
| return capacity_words(Metaspace::NonClassType) + |
| capacity_words(Metaspace::ClassType); |
| } |
| static size_t capacity_bytes(Metaspace::MetadataType mdtype) { |
| return capacity_words(mdtype) * BytesPerWord; |
| } |
| static size_t capacity_bytes() { |
| return capacity_words() * BytesPerWord; |
| } |
| |
| static size_t used_words() { |
| return used_words(Metaspace::NonClassType) + |
| used_words(Metaspace::ClassType); |
| } |
| static size_t used_bytes(Metaspace::MetadataType mdtype) { |
| return used_words(mdtype) * BytesPerWord; |
| } |
| static size_t used_bytes() { |
| return used_words() * BytesPerWord; |
| } |
| |
| // Space committed but yet unclaimed by any class loader. |
| static size_t free_in_vs_bytes(); |
| static size_t free_in_vs_bytes(Metaspace::MetadataType mdtype); |
| |
| static size_t reserved_bytes(Metaspace::MetadataType mdtype); |
| static size_t reserved_bytes() { |
| return reserved_bytes(Metaspace::ClassType) + |
| reserved_bytes(Metaspace::NonClassType); |
| } |
| |
| static size_t committed_bytes(Metaspace::MetadataType mdtype); |
| static size_t committed_bytes() { |
| return committed_bytes(Metaspace::ClassType) + |
| committed_bytes(Metaspace::NonClassType); |
| } |
| |
| static size_t min_chunk_size_words(); |
| static size_t min_chunk_size_bytes() { |
| return min_chunk_size_words() * BytesPerWord; |
| } |
| |
| // Flags for print_report(). |
| enum ReportFlag { |
| // Show usage by class loader. |
| rf_show_loaders = (1 << 0), |
| // Breaks report down by chunk type (small, medium, ...). |
| rf_break_down_by_chunktype = (1 << 1), |
| // Breaks report down by space type (anonymous, reflection, ...). |
| rf_break_down_by_spacetype = (1 << 2), |
| // Print details about the underlying virtual spaces. |
| rf_show_vslist = (1 << 3), |
| // Print metaspace map. |
| rf_show_vsmap = (1 << 4), |
| // If show_loaders: show loaded classes for each loader. |
| rf_show_classes = (1 << 5) |
| }; |
| |
| // This will print out a basic metaspace usage report but |
| // unlike print_report() is guaranteed not to lock or to walk the CLDG. |
| static void print_basic_report(outputStream* st, size_t scale); |
| |
| // Prints a report about the current metaspace state. |
| // Optional parts can be enabled via flags. |
| // Function will walk the CLDG and will lock the expand lock; if that is not |
| // convenient, use print_basic_report() instead. |
| static void print_report(outputStream* out, size_t scale = 0, int flags = 0); |
| |
| static bool has_chunk_free_list(Metaspace::MetadataType mdtype); |
| static MetaspaceChunkFreeListSummary chunk_free_list_summary(Metaspace::MetadataType mdtype); |
| |
| // Print change in used metadata. |
| static void print_metaspace_change(size_t prev_metadata_used); |
| static void print_on(outputStream * out); |
| |
| // Prints an ASCII representation of the given space. |
| static void print_metaspace_map(outputStream* out, Metaspace::MetadataType mdtype); |
| |
| static void dump(outputStream* out); |
| static void verify_free_chunks(); |
| // Check internal counters (capacity, used). |
| static void verify_metrics(); |
| }; |
| |
| // Metaspace are deallocated when their class loader are GC'ed. |
| // This class implements a policy for inducing GC's to recover |
| // Metaspaces. |
| |
| class MetaspaceGC : AllStatic { |
| |
| // The current high-water-mark for inducing a GC. |
| // When committed memory of all metaspaces reaches this value, |
| // a GC is induced and the value is increased. Size is in bytes. |
| static volatile size_t _capacity_until_GC; |
| |
| // For a CMS collection, signal that a concurrent collection should |
| // be started. |
| static bool _should_concurrent_collect; |
| |
| static uint _shrink_factor; |
| |
| static size_t shrink_factor() { return _shrink_factor; } |
| void set_shrink_factor(uint v) { _shrink_factor = v; } |
| |
| public: |
| |
| static void initialize(); |
| static void post_initialize(); |
| |
| static size_t capacity_until_GC(); |
| static bool inc_capacity_until_GC(size_t v, |
| size_t* new_cap_until_GC = NULL, |
| size_t* old_cap_until_GC = NULL); |
| static size_t dec_capacity_until_GC(size_t v); |
| |
| static bool should_concurrent_collect() { return _should_concurrent_collect; } |
| static void set_should_concurrent_collect(bool v) { |
| _should_concurrent_collect = v; |
| } |
| |
| // The amount to increase the high-water-mark (_capacity_until_GC) |
| static size_t delta_capacity_until_GC(size_t bytes); |
| |
| // Tells if we have can expand metaspace without hitting set limits. |
| static bool can_expand(size_t words, bool is_class); |
| |
| // Returns amount that we can expand without hitting a GC, |
| // measured in words. |
| static size_t allowed_expansion(); |
| |
| // Calculate the new high-water mark at which to induce |
| // a GC. |
| static void compute_new_size(); |
| }; |
| |
| #endif // SHARE_VM_MEMORY_METASPACE_HPP |