src/hotspot/share/memory/metaspace.hpp
author stefank
Thu, 22 Feb 2018 18:35:04 +0100
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parent 47808 57752bd5d1b4
child 49365 825f006619e5
permissions -rw-r--r--
8198509: Move satisfy_failed_metadata_allocation out from CollectorPolicy Reviewed-by: sjohanss, pliden
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/*
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 * Copyright (c) 2011, 2017, 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 "memory/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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//
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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 PrintCLDMetaspaceInfoClosure;
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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 MetaspaceShared;
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  friend class CollectedHeap;
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  friend class PrintCLDMetaspaceInfoClosure;
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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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    AnonymousMetaspaceType,
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    ReflectionMetaspaceType
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  };
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 private:
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  static void verify_global_initialization();
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  void initialize(Mutex* lock, MetaspaceType type);
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  // Initialize 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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  void initialize_first_chunk(MetaspaceType type, MetadataType mdtype);
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  Metachunk* get_initialization_chunk(MetaspaceType type, MetadataType mdtype);
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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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  DEBUG_ONLY(static bool   _frozen;)
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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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  SpaceManager* get_space_manager(MetadataType mdtype) {
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    assert(mdtype != MetadataTypeCount, "MetadaTypeCount can't be used as mdtype");
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    return mdtype == ClassType ? class_vsm() : vsm();
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  }
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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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  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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  static void freeze() {
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    assert(DumpSharedSpaces, "sanity");
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    DEBUG_ONLY(_frozen = true;)
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  }
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#ifdef _LP64
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  static void allocate_metaspace_compressed_klass_ptrs(char* requested_addr, address cds_base);
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#endif
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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 initialize_class_space(ReservedSpace rs);
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#endif
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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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  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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                            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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  static bool contains_non_shared(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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  static void print_compressed_class_space(outputStream* st, const char* requested_addr = 0) NOT_LP64({});
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  // Return TRUE only if UseCompressedClassPointers is True.
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  static bool using_class_space() {
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    return NOT_LP64(false) LP64_ONLY(UseCompressedClassPointers);
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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 volatile 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 void print_metadata_for_nmt(outputStream* out, size_t scale = K);
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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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  // Prints an ASCII representation of the given space.
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  static void print_metaspace_map(outputStream* out, Metaspace::MetadataType mdtype);
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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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   380
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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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   389
  // be started.
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  static bool _should_concurrent_collect;
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   391
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  static uint _shrink_factor;
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   393
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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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   397
 public:
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   398
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  static void initialize();
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  static void post_initialize();
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   401
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   402
  static size_t capacity_until_GC();
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   403
  static bool inc_capacity_until_GC(size_t v,
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   404
                                    size_t* new_cap_until_GC = NULL,
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   405
                                    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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   407
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   408
  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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   410
    _should_concurrent_collect = v;
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   411
  }
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   412
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  // The amount to increase the high-water-mark (_capacity_until_GC)
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   414
  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