jdk8-mips64-public/hotspot: src/share/vm/memory/metaspace.hpp@461159cd7a91

     1 /*

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

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

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    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).

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    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 {ClassType = 0,

    91                      NonClassType = ClassType + 1,

    92                      MetadataTypeCount = ClassType + 2

    93   };

    94   enum MetaspaceType {

    95     StandardMetaspaceType,

    96     BootMetaspaceType,

    97     ROMetaspaceType,

    98     ReadWriteMetaspaceType,

    99     AnonymousMetaspaceType,

   100     ReflectionMetaspaceType

   101   };

   103  private:

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

   106   Metachunk* get_initialization_chunk(MetadataType mdtype,

   107                                       size_t chunk_word_size,

   108                                       size_t chunk_bunch);

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

   111   static size_t align_word_size_up(size_t);

   113   // Aligned size of the metaspace.

   114   static size_t _class_metaspace_size;

   116   static size_t class_metaspace_size() {

   117     return _class_metaspace_size;

   118   }

   119   static void set_class_metaspace_size(size_t metaspace_size) {

   120     _class_metaspace_size = metaspace_size;

   121   }

   123   static size_t _first_chunk_word_size;

   124   static size_t _first_class_chunk_word_size;

   126   SpaceManager* _vsm;

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

   129   SpaceManager* _class_vsm;

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

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

   133   // within a Metachunk and is used by

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

   135   // which returns a Metablock.

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

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

   139   static VirtualSpaceList* _space_list;

   140   static VirtualSpaceList* _class_space_list;

   142   static ChunkManager* _chunk_manager_metadata;

   143   static ChunkManager* _chunk_manager_class;

   145  public:

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

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

   148   static VirtualSpaceList* get_space_list(MetadataType mdtype) {

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

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

   151   }

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

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

   155   static ChunkManager* get_chunk_manager(MetadataType mdtype) {

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

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

   158   }

   160  private:

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

   162   // maintain a single list for now.

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

   165 #ifdef _LP64

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

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

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

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

   173   static void initialize_class_space(ReservedSpace rs);

   174 #endif

   176   class AllocRecord : public CHeapObj<mtClass> {

   177   public:

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

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

   180     AllocRecord *_next;

   181     address _ptr;

   182     MetaspaceObj::Type _type;

   183     int _byte_size;

   184   };

   186   AllocRecord * _alloc_record_head;

   187   AllocRecord * _alloc_record_tail;

   189  public:

   191   Metaspace(Mutex* lock, MetaspaceType type);

   192   ~Metaspace();

   194   // Initialize globals for Metaspace

   195   static void global_initialize();

   197   static size_t first_chunk_word_size() { return _first_chunk_word_size; }

   198   static size_t first_class_chunk_word_size() { return _first_class_chunk_word_size; }

   200   char*  bottom() const;

   201   size_t used_words_slow(MetadataType mdtype) const;

   202   size_t free_words_slow(MetadataType mdtype) const;

   203   size_t capacity_words_slow(MetadataType mdtype) const;

   205   size_t used_bytes_slow(MetadataType mdtype) const;

   206   size_t capacity_bytes_slow(MetadataType mdtype) const;

   208   static Metablock* allocate(ClassLoaderData* loader_data, size_t word_size,

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

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

   212   MetaWord* expand_and_allocate(size_t size,

   213                                 MetadataType mdtype);

   215   static bool contains(const void *ptr);

   216   void dump(outputStream* const out) const;

   218   // Free empty virtualspaces

   219   static void purge(MetadataType mdtype);

   220   static void purge();

   222   void print_on(outputStream* st) const;

   223   // Debugging support

   224   void verify();

   226   class AllocRecordClosure :  public StackObj {

   227   public:

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

   229   };

   231   void iterate(AllocRecordClosure *closure);

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

   234   static bool using_class_space() {

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

   236   }

   238 };

   240 class MetaspaceAux : AllStatic {

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

   243   // These methods iterate over the classloader data graph

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

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

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

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

   248   static size_t capacity_bytes_slow();

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

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

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

   253   // type of Metadata

   254   static size_t _allocated_capacity_words[Metaspace:: MetadataTypeCount];

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

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

   257   // type of Metadata.

   258   static size_t _allocated_used_words[Metaspace:: MetadataTypeCount];

   260  public:

   261   // Decrement and increment _allocated_capacity_words

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

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

   265   // Decrement and increment _allocated_used_words

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

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

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

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

   271   // iterating over the classloader data graph

   272   static size_t used_bytes_slow() {

   273     return used_bytes_slow(Metaspace::ClassType) +

   274            used_bytes_slow(Metaspace::NonClassType);

   275   }

   277   // Used by MetaspaceCounters

   278   static size_t free_chunks_total_words();

   279   static size_t free_chunks_total_bytes();

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

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

   283     return _allocated_capacity_words[mdtype];

   284   }

   285   static size_t allocated_capacity_words() {

   286     return allocated_capacity_words(Metaspace::NonClassType) +

   287            allocated_capacity_words(Metaspace::ClassType);

   288   }

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

   290     return allocated_capacity_words(mdtype) * BytesPerWord;

   291   }

   292   static size_t allocated_capacity_bytes() {

   293     return allocated_capacity_words() * BytesPerWord;

   294   }

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

   297     return _allocated_used_words[mdtype];

   298   }

   299   static size_t allocated_used_words() {

   300     return allocated_used_words(Metaspace::NonClassType) +

   301            allocated_used_words(Metaspace::ClassType);

   302   }

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

   304     return allocated_used_words(mdtype) * BytesPerWord;

   305   }

   306   static size_t allocated_used_bytes() {

   307     return allocated_used_words() * BytesPerWord;

   308   }

   310   static size_t free_bytes();

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

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

   314   static size_t reserved_bytes() {

   315     return reserved_bytes(Metaspace::ClassType) +

   316            reserved_bytes(Metaspace::NonClassType);

   317   }

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

   320   static size_t committed_bytes() {

   321     return committed_bytes(Metaspace::ClassType) +

   322            committed_bytes(Metaspace::NonClassType);

   323   }

   325   static size_t min_chunk_size_words();

   326   static size_t min_chunk_size_bytes() {

   327     return min_chunk_size_words() * BytesPerWord;

   328   }

   330   // Print change in used metadata.

   331   static void print_metaspace_change(size_t prev_metadata_used);

   332   static void print_on(outputStream * out);

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

   335   static void print_class_waste(outputStream* out);

   336   static void print_waste(outputStream* out);

   337   static void dump(outputStream* out);

   338   static void verify_free_chunks();

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

   340   // capacity_bytes_slow() are the same.

   341   static void verify_capacity();

   342   static void verify_used();

   343   static void verify_metrics();

   344 };

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

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

   348 // Metaspaces.

   350 class MetaspaceGC : AllStatic {

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

   353   // the capacity of all space in the virtual lists reaches this value,

   354   // a GC is induced and the value is increased.  This should be changed

   355   // to the space actually used for allocations to avoid affects of

   356   // fragmentation losses to partially used chunks.  Size is in words.

   357   static size_t _capacity_until_GC;

   359   // After a GC is done any allocation that fails should try to expand

   360   // the capacity of the Metaspaces.  This flag is set during attempts

   361   // to allocate in the VMGCOperation that does the GC.

   362   static bool _expand_after_GC;

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

   365   // be started.

   366   static bool _should_concurrent_collect;

   368   static uint _shrink_factor;

   370   static void set_capacity_until_GC(size_t v) { _capacity_until_GC = v; }

   372   static size_t shrink_factor() { return _shrink_factor; }

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

   375  public:

   377   static size_t capacity_until_GC() { return _capacity_until_GC; }

   378   static void inc_capacity_until_GC(size_t v) { _capacity_until_GC += v; }

   379   static void dec_capacity_until_GC(size_t v) {

   380     _capacity_until_GC = _capacity_until_GC > v ? _capacity_until_GC - v : 0;

   381   }

   382   static bool expand_after_GC()           { return _expand_after_GC; }

   383   static void set_expand_after_GC(bool v) { _expand_after_GC = v; }

   385   static bool should_concurrent_collect() { return _should_concurrent_collect; }

   386   static void set_should_concurrent_collect(bool v) {

   387     _should_concurrent_collect = v;

   388   }

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

   391   static size_t delta_capacity_until_GC(size_t word_size);

   393   // It is expected that this will be called when the current capacity

   394   // has been used and a GC should be considered.

   395   static bool should_expand(VirtualSpaceList* vsl, size_t word_size);

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

   398   // a GC.

   399   static void compute_new_size();

   400 };

   402 #endif // SHARE_VM_MEMORY_METASPACE_HPP

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

src/share/vm/memory/metaspace.hpp@461159cd7a91

src/share/vm/memory/metaspace.hpp