436 lines
15 KiB
C++
436 lines
15 KiB
C++
/*
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* Copyright (c) 2011, 2014, 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_VM_MEMORY_METASPACE_HPP
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#define SHARE_VM_MEMORY_METASPACE_HPP
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#include "memory/allocation.hpp"
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#include "memory/memRegion.hpp"
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#include "memory/metaspaceChunkFreeListSummary.hpp"
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#include "runtime/virtualspace.hpp"
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#include "utilities/exceptions.hpp"
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// Metaspace
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//
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// Metaspaces are Arenas for the VM's metadata.
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// They are allocated one per class loader object, and one for the null
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// bootstrap class loader
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// Eventually for bootstrap loader we'll have a read-only section and read-write
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// to write for DumpSharedSpaces and read for UseSharedSpaces
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//
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// block X ---+ +-------------------+
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// | | Virtualspace |
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// | | |
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// | | |
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// | |-------------------|
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// | || Chunk |
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// | || |
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// | ||---------- |
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// +------>||| block 0 | |
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// ||---------- |
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// ||| block 1 | |
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// ||---------- |
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// || |
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// |-------------------|
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// | |
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// | |
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// +-------------------+
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//
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class ChunkManager;
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class ClassLoaderData;
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class Metablock;
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class Metachunk;
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class MetaspaceTracer;
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class MetaWord;
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class Mutex;
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class outputStream;
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class SpaceManager;
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class VirtualSpaceList;
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// Metaspaces each have a SpaceManager and allocations
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// are done by the SpaceManager. Allocations are done
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// out of the current Metachunk. When the current Metachunk
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// is exhausted, the SpaceManager gets a new one from
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// the current VirtualSpace. When the VirtualSpace is exhausted
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// the SpaceManager gets a new one. The SpaceManager
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// also manages freelists of available Chunks.
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//
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// Currently the space manager maintains the list of
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// virtual spaces and the list of chunks in use. Its
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// allocate() method returns a block for use as a
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// quantum of metadata.
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class Metaspace : public CHeapObj<mtClass> {
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friend class VMStructs;
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friend class SpaceManager;
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friend class VM_CollectForMetadataAllocation;
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friend class MetaspaceGC;
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friend class MetaspaceAux;
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friend class CollectorPolicy;
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public:
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enum MetadataType {
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ClassType,
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NonClassType,
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MetadataTypeCount
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};
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enum MetaspaceType {
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StandardMetaspaceType,
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BootMetaspaceType,
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ROMetaspaceType,
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ReadWriteMetaspaceType,
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AnonymousMetaspaceType,
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ReflectionMetaspaceType
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};
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private:
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void initialize(Mutex* lock, MetaspaceType type);
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// Get the first chunk for a Metaspace. Used for
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// special cases such as the boot class loader, reflection
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// class loader and anonymous class loader.
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Metachunk* get_initialization_chunk(MetadataType mdtype,
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size_t chunk_word_size,
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size_t chunk_bunch);
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// Align up the word size to the allocation word size
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static size_t align_word_size_up(size_t);
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// Aligned size of the metaspace.
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static size_t _compressed_class_space_size;
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static size_t compressed_class_space_size() {
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return _compressed_class_space_size;
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}
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static void set_compressed_class_space_size(size_t size) {
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_compressed_class_space_size = size;
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}
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static size_t _first_chunk_word_size;
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static size_t _first_class_chunk_word_size;
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static size_t _commit_alignment;
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static size_t _reserve_alignment;
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SpaceManager* _vsm;
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SpaceManager* vsm() const { return _vsm; }
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SpaceManager* _class_vsm;
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SpaceManager* class_vsm() const { return _class_vsm; }
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// Allocate space for metadata of type mdtype. This is space
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// within a Metachunk and is used by
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// allocate(ClassLoaderData*, size_t, bool, MetadataType, TRAPS)
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MetaWord* allocate(size_t word_size, MetadataType mdtype);
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MetaWord* expand_and_allocate(size_t size, MetadataType mdtype);
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// Virtual Space lists for both classes and other metadata
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static VirtualSpaceList* _space_list;
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static VirtualSpaceList* _class_space_list;
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static ChunkManager* _chunk_manager_metadata;
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static ChunkManager* _chunk_manager_class;
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static const MetaspaceTracer* _tracer;
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public:
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static VirtualSpaceList* space_list() { return _space_list; }
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static VirtualSpaceList* class_space_list() { return _class_space_list; }
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static VirtualSpaceList* get_space_list(MetadataType mdtype) {
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assert(mdtype != MetadataTypeCount, "MetadaTypeCount can't be used as mdtype");
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return mdtype == ClassType ? class_space_list() : space_list();
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}
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static ChunkManager* chunk_manager_metadata() { return _chunk_manager_metadata; }
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static ChunkManager* chunk_manager_class() { return _chunk_manager_class; }
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static ChunkManager* get_chunk_manager(MetadataType mdtype) {
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assert(mdtype != MetadataTypeCount, "MetadaTypeCount can't be used as mdtype");
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return mdtype == ClassType ? chunk_manager_class() : chunk_manager_metadata();
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}
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static const MetaspaceTracer* tracer() { return _tracer; }
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private:
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// These 2 methods are used by DumpSharedSpaces only, where only _vsm is used. So we will
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// maintain a single list for now.
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void record_allocation(void* ptr, MetaspaceObj::Type type, size_t word_size);
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void record_deallocation(void* ptr, size_t word_size);
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#ifdef _LP64
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static void set_narrow_klass_base_and_shift(address metaspace_base, address cds_base);
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// Returns true if can use CDS with metaspace allocated as specified address.
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static bool can_use_cds_with_metaspace_addr(char* metaspace_base, address cds_base);
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static void allocate_metaspace_compressed_klass_ptrs(char* requested_addr, address cds_base);
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static void initialize_class_space(ReservedSpace rs);
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#endif
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class AllocRecord : public CHeapObj<mtClass> {
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public:
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AllocRecord(address ptr, MetaspaceObj::Type type, int byte_size)
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: _next(NULL), _ptr(ptr), _type(type), _byte_size(byte_size) {}
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AllocRecord *_next;
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address _ptr;
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MetaspaceObj::Type _type;
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int _byte_size;
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};
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AllocRecord * _alloc_record_head;
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AllocRecord * _alloc_record_tail;
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size_t class_chunk_size(size_t word_size);
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public:
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Metaspace(Mutex* lock, MetaspaceType type);
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~Metaspace();
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static void ergo_initialize();
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static void global_initialize();
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static void post_initialize();
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static size_t first_chunk_word_size() { return _first_chunk_word_size; }
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static size_t first_class_chunk_word_size() { return _first_class_chunk_word_size; }
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static size_t reserve_alignment() { return _reserve_alignment; }
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static size_t reserve_alignment_words() { return _reserve_alignment / BytesPerWord; }
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static size_t commit_alignment() { return _commit_alignment; }
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static size_t commit_alignment_words() { return _commit_alignment / BytesPerWord; }
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char* bottom() const;
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size_t used_words_slow(MetadataType mdtype) const;
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size_t free_words_slow(MetadataType mdtype) const;
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size_t capacity_words_slow(MetadataType mdtype) const;
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size_t used_bytes_slow(MetadataType mdtype) const;
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size_t capacity_bytes_slow(MetadataType mdtype) const;
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size_t allocated_blocks_bytes() const;
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size_t allocated_chunks_bytes() const;
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static MetaWord* allocate(ClassLoaderData* loader_data, size_t word_size,
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bool read_only, MetaspaceObj::Type type, TRAPS);
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void deallocate(MetaWord* ptr, size_t byte_size, bool is_class);
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static bool contains(const void* ptr);
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void dump(outputStream* const out) const;
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// Free empty virtualspaces
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static void purge(MetadataType mdtype);
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static void purge();
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static void report_metadata_oome(ClassLoaderData* loader_data, size_t word_size,
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MetaspaceObj::Type type, MetadataType mdtype, TRAPS);
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static const char* metadata_type_name(Metaspace::MetadataType mdtype);
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void print_on(outputStream* st) const;
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// Debugging support
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void verify();
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class AllocRecordClosure : public StackObj {
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public:
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virtual void doit(address ptr, MetaspaceObj::Type type, int byte_size) = 0;
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};
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void iterate(AllocRecordClosure *closure);
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// Return TRUE only if UseCompressedClassPointers is True and DumpSharedSpaces is False.
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static bool using_class_space() {
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return NOT_LP64(false) LP64_ONLY(UseCompressedClassPointers && !DumpSharedSpaces);
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}
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static bool is_class_space_allocation(MetadataType mdType) {
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return mdType == ClassType && using_class_space();
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}
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};
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class MetaspaceAux : AllStatic {
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static size_t free_chunks_total_words(Metaspace::MetadataType mdtype);
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// These methods iterate over the classloader data graph
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// for the given Metaspace type. These are slow.
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static size_t used_bytes_slow(Metaspace::MetadataType mdtype);
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static size_t free_bytes_slow(Metaspace::MetadataType mdtype);
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static size_t capacity_bytes_slow(Metaspace::MetadataType mdtype);
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static size_t capacity_bytes_slow();
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// Running sum of space in all Metachunks that has been
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// allocated to a Metaspace. This is used instead of
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// iterating over all the classloaders. One for each
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// type of Metadata
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static size_t _capacity_words[Metaspace:: MetadataTypeCount];
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// Running sum of space in all Metachunks that
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// are being used for metadata. One for each
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// type of Metadata.
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static size_t _used_words[Metaspace:: MetadataTypeCount];
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public:
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// Decrement and increment _allocated_capacity_words
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static void dec_capacity(Metaspace::MetadataType type, size_t words);
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static void inc_capacity(Metaspace::MetadataType type, size_t words);
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// Decrement and increment _allocated_used_words
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static void dec_used(Metaspace::MetadataType type, size_t words);
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static void inc_used(Metaspace::MetadataType type, size_t words);
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// Total of space allocated to metadata in all Metaspaces.
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// This sums the space used in each Metachunk by
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// iterating over the classloader data graph
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static size_t used_bytes_slow() {
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return used_bytes_slow(Metaspace::ClassType) +
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used_bytes_slow(Metaspace::NonClassType);
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}
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// Used by MetaspaceCounters
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static size_t free_chunks_total_words();
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static size_t free_chunks_total_bytes();
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static size_t free_chunks_total_bytes(Metaspace::MetadataType mdtype);
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static size_t capacity_words(Metaspace::MetadataType mdtype) {
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return _capacity_words[mdtype];
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}
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static size_t capacity_words() {
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return capacity_words(Metaspace::NonClassType) +
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capacity_words(Metaspace::ClassType);
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}
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static size_t capacity_bytes(Metaspace::MetadataType mdtype) {
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return capacity_words(mdtype) * BytesPerWord;
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}
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static size_t capacity_bytes() {
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return capacity_words() * BytesPerWord;
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}
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static size_t used_words(Metaspace::MetadataType mdtype) {
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return _used_words[mdtype];
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}
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static size_t used_words() {
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return used_words(Metaspace::NonClassType) +
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used_words(Metaspace::ClassType);
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}
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static size_t used_bytes(Metaspace::MetadataType mdtype) {
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return used_words(mdtype) * BytesPerWord;
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}
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static size_t used_bytes() {
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return used_words() * BytesPerWord;
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}
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static size_t free_bytes();
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static size_t free_bytes(Metaspace::MetadataType mdtype);
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static size_t reserved_bytes(Metaspace::MetadataType mdtype);
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static size_t reserved_bytes() {
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return reserved_bytes(Metaspace::ClassType) +
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reserved_bytes(Metaspace::NonClassType);
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}
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static size_t committed_bytes(Metaspace::MetadataType mdtype);
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static size_t committed_bytes() {
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return committed_bytes(Metaspace::ClassType) +
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committed_bytes(Metaspace::NonClassType);
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}
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static size_t min_chunk_size_words();
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static size_t min_chunk_size_bytes() {
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return min_chunk_size_words() * BytesPerWord;
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}
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static bool has_chunk_free_list(Metaspace::MetadataType mdtype);
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static MetaspaceChunkFreeListSummary chunk_free_list_summary(Metaspace::MetadataType mdtype);
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// Print change in used metadata.
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static void print_metaspace_change(size_t prev_metadata_used);
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static void print_on(outputStream * out);
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static void print_on(outputStream * out, Metaspace::MetadataType mdtype);
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static void print_class_waste(outputStream* out);
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static void print_waste(outputStream* out);
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static void dump(outputStream* out);
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static void verify_free_chunks();
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// Checks that the values returned by allocated_capacity_bytes() and
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// capacity_bytes_slow() are the same.
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static void verify_capacity();
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static void verify_used();
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static void verify_metrics();
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};
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// Metaspace are deallocated when their class loader are GC'ed.
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// This class implements a policy for inducing GC's to recover
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// Metaspaces.
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class MetaspaceGC : AllStatic {
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// The current high-water-mark for inducing a GC.
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// When committed memory of all metaspaces reaches this value,
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// a GC is induced and the value is increased. Size is in bytes.
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static volatile intptr_t _capacity_until_GC;
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// For a CMS collection, signal that a concurrent collection should
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// be started.
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static bool _should_concurrent_collect;
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static uint _shrink_factor;
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static size_t shrink_factor() { return _shrink_factor; }
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void set_shrink_factor(uint v) { _shrink_factor = v; }
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public:
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static void initialize();
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static void post_initialize();
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static size_t capacity_until_GC();
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static bool inc_capacity_until_GC(size_t v,
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size_t* new_cap_until_GC = NULL,
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size_t* old_cap_until_GC = NULL);
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static size_t dec_capacity_until_GC(size_t v);
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static bool should_concurrent_collect() { return _should_concurrent_collect; }
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static void set_should_concurrent_collect(bool v) {
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_should_concurrent_collect = v;
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}
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// The amount to increase the high-water-mark (_capacity_until_GC)
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static size_t delta_capacity_until_GC(size_t bytes);
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// Tells if we have can expand metaspace without hitting set limits.
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static bool can_expand(size_t words, bool is_class);
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// Returns amount that we can expand without hitting a GC,
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// measured in words.
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static size_t allowed_expansion();
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// Calculate the new high-water mark at which to induce
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// a GC.
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static void compute_new_size();
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};
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#endif // SHARE_VM_MEMORY_METASPACE_HPP
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