jdk8-mips64-public/hotspot: src/share/vm/memory/metaspace.hpp@752ba2e5f6d0

     1 /*

     2  * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    24 #ifndef SHARE_VM_MEMORY_METASPACE_HPP

    25 #define SHARE_VM_MEMORY_METASPACE_HPP

    27 #include "memory/allocation.hpp"

    28 #include "memory/memRegion.hpp"

    29 #include "runtime/virtualspace.hpp"

    30 #include "utilities/exceptions.hpp"

    32 // Metaspace

    33 //

    34 // Metaspaces are Arenas for the VM's metadata.

    35 // They are allocated one per class loader object, and one for the null

    36 // bootstrap class loader

    37 // Eventually for bootstrap loader we'll have a read-only section and read-write

    38 // to write for DumpSharedSpaces and read for UseSharedSpaces

    39 //

    40 //    block X ---+       +-------------------+

    41 //               |       |  Virtualspace     |

    42 //               |       |                   |

    43 //               |       |                   |

    44 //               |       |-------------------|

    45 //               |       || Chunk            |

    46 //               |       ||                  |

    47 //               |       ||----------        |

    48 //               +------>||| block 0 |       |

    49 //                       ||----------        |

    50 //                       ||| block 1 |       |

    51 //                       ||----------        |

    52 //                       ||                  |

    53 //                       |-------------------|

    54 //                       |                   |

    55 //                       |                   |

    56 //                       +-------------------+

    57 //

    59 class ChunkManager;

    60 class ClassLoaderData;

    61 class Metablock;

    62 class Metachunk;

    63 class MetaWord;

    64 class Mutex;

    65 class outputStream;

    66 class SpaceManager;

    67 class VirtualSpaceList;

    69 // Metaspaces each have a  SpaceManager and allocations

    70 // are done by the SpaceManager.  Allocations are done

    71 // out of the current Metachunk.  When the current Metachunk

    72 // is exhausted, the SpaceManager gets a new one from

    73 // the current VirtualSpace.  When the VirtualSpace is exhausted

    74 // the SpaceManager gets a new one.  The SpaceManager

    75 // also manages freelists of available Chunks.

    76 //

    77 // Currently the space manager maintains the list of

    78 // virtual spaces and the list of chunks in use.  Its

    79 // allocate() method returns a block for use as a

    80 // quantum of metadata.

    82 class Metaspace : public CHeapObj<mtClass> {

    83   friend class VMStructs;

    84   friend class SpaceManager;

    85   friend class VM_CollectForMetadataAllocation;

    86   friend class MetaspaceGC;

    87   friend class MetaspaceAux;

    89  public:

    90   enum MetadataType {

    91     ClassType,

    92     NonClassType,

    93     MetadataTypeCount

    94   };

    95   enum MetaspaceType {

    96     StandardMetaspaceType,

    97     BootMetaspaceType,

    98     ROMetaspaceType,

    99     ReadWriteMetaspaceType,

   100     AnonymousMetaspaceType,

   101     ReflectionMetaspaceType

   102   };

   104  private:

   105   void initialize(Mutex* lock, MetaspaceType type);

   107   // Get the first chunk for a Metaspace.  Used for

   108   // special cases such as the boot class loader, reflection

   109   // class loader and anonymous class loader.

   110   Metachunk* get_initialization_chunk(MetadataType mdtype,

   111                                       size_t chunk_word_size,

   112                                       size_t chunk_bunch);

   114   // Align up the word size to the allocation word size

   115   static size_t align_word_size_up(size_t);

   117   // Aligned size of the metaspace.

   118   static size_t _compressed_class_space_size;

   120   static size_t compressed_class_space_size() {

   121     return _compressed_class_space_size;

   122   }

   124   static void set_compressed_class_space_size(size_t size) {

   125     _compressed_class_space_size = size;

   126   }

   128   static size_t _first_chunk_word_size;

   129   static size_t _first_class_chunk_word_size;

   131   static size_t _commit_alignment;

   132   static size_t _reserve_alignment;

   134   SpaceManager* _vsm;

   135   SpaceManager* vsm() const { return _vsm; }

   137   SpaceManager* _class_vsm;

   138   SpaceManager* class_vsm() const { return _class_vsm; }

   140   // Allocate space for metadata of type mdtype. This is space

   141   // within a Metachunk and is used by

   142   //   allocate(ClassLoaderData*, size_t, bool, MetadataType, TRAPS)

   143   MetaWord* allocate(size_t word_size, MetadataType mdtype);

   145   // Virtual Space lists for both classes and other metadata

   146   static VirtualSpaceList* _space_list;

   147   static VirtualSpaceList* _class_space_list;

   149   static ChunkManager* _chunk_manager_metadata;

   150   static ChunkManager* _chunk_manager_class;

   152  public:

   153   static VirtualSpaceList* space_list()       { return _space_list; }

   154   static VirtualSpaceList* class_space_list() { return _class_space_list; }

   155   static VirtualSpaceList* get_space_list(MetadataType mdtype) {

   156     assert(mdtype != MetadataTypeCount, "MetadaTypeCount can't be used as mdtype");

   157     return mdtype == ClassType ? class_space_list() : space_list();

   158   }

   160   static ChunkManager* chunk_manager_metadata() { return _chunk_manager_metadata; }

   161   static ChunkManager* chunk_manager_class()    { return _chunk_manager_class; }

   162   static ChunkManager* get_chunk_manager(MetadataType mdtype) {

   163     assert(mdtype != MetadataTypeCount, "MetadaTypeCount can't be used as mdtype");

   164     return mdtype == ClassType ? chunk_manager_class() : chunk_manager_metadata();

   165   }

   167  private:

   168   // This is used by DumpSharedSpaces only, where only _vsm is used. So we will

   169   // maintain a single list for now.

   170   void record_allocation(void* ptr, MetaspaceObj::Type type, size_t word_size);

   172 #ifdef _LP64

   173   static void set_narrow_klass_base_and_shift(address metaspace_base, address cds_base);

   175   // Returns true if can use CDS with metaspace allocated as specified address.

   176   static bool can_use_cds_with_metaspace_addr(char* metaspace_base, address cds_base);

   178   static void allocate_metaspace_compressed_klass_ptrs(char* requested_addr, address cds_base);

   180   static void initialize_class_space(ReservedSpace rs);

   181 #endif

   183   class AllocRecord : public CHeapObj<mtClass> {

   184   public:

   185     AllocRecord(address ptr, MetaspaceObj::Type type, int byte_size)

   186       : _next(NULL), _ptr(ptr), _type(type), _byte_size(byte_size) {}

   187     AllocRecord *_next;

   188     address _ptr;

   189     MetaspaceObj::Type _type;

   190     int _byte_size;

   191   };

   193   AllocRecord * _alloc_record_head;

   194   AllocRecord * _alloc_record_tail;

   196   size_t class_chunk_size(size_t word_size);

   198  public:

   200   Metaspace(Mutex* lock, MetaspaceType type);

   201   ~Metaspace();

   203   static void ergo_initialize();

   204   static void global_initialize();

   206   static size_t first_chunk_word_size() { return _first_chunk_word_size; }

   207   static size_t first_class_chunk_word_size() { return _first_class_chunk_word_size; }

   209   static size_t reserve_alignment()       { return _reserve_alignment; }

   210   static size_t reserve_alignment_words() { return _reserve_alignment / BytesPerWord; }

   211   static size_t commit_alignment()        { return _commit_alignment; }

   212   static size_t commit_alignment_words()  { return _commit_alignment / BytesPerWord; }

   214   char*  bottom() const;

   215   size_t used_words_slow(MetadataType mdtype) const;

   216   size_t free_words_slow(MetadataType mdtype) const;

   217   size_t capacity_words_slow(MetadataType mdtype) const;

   219   size_t used_bytes_slow(MetadataType mdtype) const;

   220   size_t capacity_bytes_slow(MetadataType mdtype) const;

   222   static MetaWord* allocate(ClassLoaderData* loader_data, size_t word_size,

   223                             bool read_only, MetaspaceObj::Type type, TRAPS);

   224   void deallocate(MetaWord* ptr, size_t byte_size, bool is_class);

   226   MetaWord* expand_and_allocate(size_t size,

   227                                 MetadataType mdtype);

   229   bool contains(const void* ptr);

   230   void dump(outputStream* const out) const;

   232   // Free empty virtualspaces

   233   static void purge(MetadataType mdtype);

   234   static void purge();

   236   static void report_metadata_oome(ClassLoaderData* loader_data, size_t word_size,

   237                                    MetadataType mdtype, TRAPS);

   239   void print_on(outputStream* st) const;

   240   // Debugging support

   241   void verify();

   243   class AllocRecordClosure :  public StackObj {

   244   public:

   245     virtual void doit(address ptr, MetaspaceObj::Type type, int byte_size) = 0;

   246   };

   248   void iterate(AllocRecordClosure *closure);

   250   // Return TRUE only if UseCompressedClassPointers is True and DumpSharedSpaces is False.

   251   static bool using_class_space() {

   252     return NOT_LP64(false) LP64_ONLY(UseCompressedClassPointers && !DumpSharedSpaces);

   253   }

   255   static bool is_class_space_allocation(MetadataType mdType) {

   256     return mdType == ClassType && using_class_space();

   257   }

   259 };

   261 class MetaspaceAux : AllStatic {

   262   static size_t free_chunks_total_words(Metaspace::MetadataType mdtype);

   264   // These methods iterate over the classloader data graph

   265   // for the given Metaspace type.  These are slow.

   266   static size_t used_bytes_slow(Metaspace::MetadataType mdtype);

   267   static size_t free_bytes_slow(Metaspace::MetadataType mdtype);

   268   static size_t capacity_bytes_slow(Metaspace::MetadataType mdtype);

   269   static size_t capacity_bytes_slow();

   271   // Running sum of space in all Metachunks that has been

   272   // allocated to a Metaspace.  This is used instead of

   273   // iterating over all the classloaders. One for each

   274   // type of Metadata

   275   static size_t _allocated_capacity_words[Metaspace:: MetadataTypeCount];

   276   // Running sum of space in all Metachunks that have

   277   // are being used for metadata. One for each

   278   // type of Metadata.

   279   static size_t _allocated_used_words[Metaspace:: MetadataTypeCount];

   281  public:

   282   // Decrement and increment _allocated_capacity_words

   283   static void dec_capacity(Metaspace::MetadataType type, size_t words);

   284   static void inc_capacity(Metaspace::MetadataType type, size_t words);

   286   // Decrement and increment _allocated_used_words

   287   static void dec_used(Metaspace::MetadataType type, size_t words);

   288   static void inc_used(Metaspace::MetadataType type, size_t words);

   290   // Total of space allocated to metadata in all Metaspaces.

   291   // This sums the space used in each Metachunk by

   292   // iterating over the classloader data graph

   293   static size_t used_bytes_slow() {

   294     return used_bytes_slow(Metaspace::ClassType) +

   295            used_bytes_slow(Metaspace::NonClassType);

   296   }

   298   // Used by MetaspaceCounters

   299   static size_t free_chunks_total_words();

   300   static size_t free_chunks_total_bytes();

   301   static size_t free_chunks_total_bytes(Metaspace::MetadataType mdtype);

   303   static size_t allocated_capacity_words(Metaspace::MetadataType mdtype) {

   304     return _allocated_capacity_words[mdtype];

   305   }

   306   static size_t allocated_capacity_words() {

   307     return allocated_capacity_words(Metaspace::NonClassType) +

   308            allocated_capacity_words(Metaspace::ClassType);

   309   }

   310   static size_t allocated_capacity_bytes(Metaspace::MetadataType mdtype) {

   311     return allocated_capacity_words(mdtype) * BytesPerWord;

   312   }

   313   static size_t allocated_capacity_bytes() {

   314     return allocated_capacity_words() * BytesPerWord;

   315   }

   317   static size_t allocated_used_words(Metaspace::MetadataType mdtype) {

   318     return _allocated_used_words[mdtype];

   319   }

   320   static size_t allocated_used_words() {

   321     return allocated_used_words(Metaspace::NonClassType) +

   322            allocated_used_words(Metaspace::ClassType);

   323   }

   324   static size_t allocated_used_bytes(Metaspace::MetadataType mdtype) {

   325     return allocated_used_words(mdtype) * BytesPerWord;

   326   }

   327   static size_t allocated_used_bytes() {

   328     return allocated_used_words() * BytesPerWord;

   329   }

   331   static size_t free_bytes();

   332   static size_t free_bytes(Metaspace::MetadataType mdtype);

   334   static size_t reserved_bytes(Metaspace::MetadataType mdtype);

   335   static size_t reserved_bytes() {

   336     return reserved_bytes(Metaspace::ClassType) +

   337            reserved_bytes(Metaspace::NonClassType);

   338   }

   340   static size_t committed_bytes(Metaspace::MetadataType mdtype);

   341   static size_t committed_bytes() {

   342     return committed_bytes(Metaspace::ClassType) +

   343            committed_bytes(Metaspace::NonClassType);

   344   }

   346   static size_t min_chunk_size_words();

   347   static size_t min_chunk_size_bytes() {

   348     return min_chunk_size_words() * BytesPerWord;

   349   }

   351   // Print change in used metadata.

   352   static void print_metaspace_change(size_t prev_metadata_used);

   353   static void print_on(outputStream * out);

   354   static void print_on(outputStream * out, Metaspace::MetadataType mdtype);

   356   static void print_class_waste(outputStream* out);

   357   static void print_waste(outputStream* out);

   358   static void dump(outputStream* out);

   359   static void verify_free_chunks();

   360   // Checks that the values returned by allocated_capacity_bytes() and

   361   // capacity_bytes_slow() are the same.

   362   static void verify_capacity();

   363   static void verify_used();

   364   static void verify_metrics();

   365 };

   367 // Metaspace are deallocated when their class loader are GC'ed.

   368 // This class implements a policy for inducing GC's to recover

   369 // Metaspaces.

   371 class MetaspaceGC : AllStatic {

   373   // The current high-water-mark for inducing a GC.

   374   // When committed memory of all metaspaces reaches this value,

   375   // a GC is induced and the value is increased. Size is in bytes.

   376   static volatile intptr_t _capacity_until_GC;

   378   // For a CMS collection, signal that a concurrent collection should

   379   // be started.

   380   static bool _should_concurrent_collect;

   382   static uint _shrink_factor;

   384   static size_t shrink_factor() { return _shrink_factor; }

   385   void set_shrink_factor(uint v) { _shrink_factor = v; }

   387  public:

   389   static void initialize() { _capacity_until_GC = MetaspaceSize; }

   391   static size_t capacity_until_GC();

   392   static size_t inc_capacity_until_GC(size_t v);

   393   static size_t dec_capacity_until_GC(size_t v);

   395   static bool should_concurrent_collect() { return _should_concurrent_collect; }

   396   static void set_should_concurrent_collect(bool v) {

   397     _should_concurrent_collect = v;

   398   }

   400   // The amount to increase the high-water-mark (_capacity_until_GC)

   401   static size_t delta_capacity_until_GC(size_t bytes);

   403   // Tells if we have can expand metaspace without hitting set limits.

   404   static bool can_expand(size_t words, bool is_class);

   406   // Returns amount that we can expand without hitting a GC,

   407   // measured in words.

   408   static size_t allowed_expansion();

   410   // Calculate the new high-water mark at which to induce

   411   // a GC.

   412   static void compute_new_size();

   413 };

   415 #endif // SHARE_VM_MEMORY_METASPACE_HPP

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/memory/metaspace.hpp@752ba2e5f6d0

src/share/vm/memory/metaspace.hpp