jdk8-mips64-public/hotspot: src/share/vm/memory/metaspace.hpp@9fec19bb0659

8032379: Remove the is_scavenging flag to process_strong_roots
Summary: Refactor the strong root processing to avoid using a boolean in addition to the ScanOption enum.
Reviewed-by: stefank, tschatzl, ehelin, jmasa

     1 /*

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    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 "memory/metaspaceChunkFreeListSummary.hpp"

    30 #include "runtime/virtualspace.hpp"

    31 #include "utilities/exceptions.hpp"

    33 // Metaspace

    34 //

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

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

    37 // bootstrap class loader

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

    39 // to write for DumpSharedSpaces and read for UseSharedSpaces

    40 //

    41 //    block X ---+       +-------------------+

    42 //               |       |  Virtualspace     |

    43 //               |       |                   |

    44 //               |       |                   |

    45 //               |       |-------------------|

    46 //               |       || Chunk            |

    47 //               |       ||                  |

    48 //               |       ||----------        |

    49 //               +------>||| block 0 |       |

    50 //                       ||----------        |

    51 //                       ||| block 1 |       |

    52 //                       ||----------        |

    53 //                       ||                  |

    54 //                       |-------------------|

    55 //                       |                   |

    56 //                       |                   |

    57 //                       +-------------------+

    58 //

    60 class ChunkManager;

    61 class ClassLoaderData;

    62 class Metablock;

    63 class Metachunk;

    64 class MetaspaceTracer;

    65 class MetaWord;

    66 class Mutex;

    67 class outputStream;

    68 class SpaceManager;

    69 class VirtualSpaceList;

    71 // Metaspaces each have a  SpaceManager and allocations

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

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

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

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

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

    77 // also manages freelists of available Chunks.

    78 //

    79 // Currently the space manager maintains the list of

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

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

    82 // quantum of metadata.

    84 class Metaspace : public CHeapObj<mtClass> {

    85   friend class VMStructs;

    86   friend class SpaceManager;

    87   friend class VM_CollectForMetadataAllocation;

    88   friend class MetaspaceGC;

    89   friend class MetaspaceAux;

    91  public:

    92   enum MetadataType {

    93     ClassType,

    94     NonClassType,

    95     MetadataTypeCount

    96   };

    97   enum MetaspaceType {

    98     StandardMetaspaceType,

    99     BootMetaspaceType,

   100     ROMetaspaceType,

   101     ReadWriteMetaspaceType,

   102     AnonymousMetaspaceType,

   103     ReflectionMetaspaceType

   104   };

   106  private:

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

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

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

   111   // class loader and anonymous class loader.

   112   Metachunk* get_initialization_chunk(MetadataType mdtype,

   113                                       size_t chunk_word_size,

   114                                       size_t chunk_bunch);

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

   117   static size_t align_word_size_up(size_t);

   119   // Aligned size of the metaspace.

   120   static size_t _compressed_class_space_size;

   122   static size_t compressed_class_space_size() {

   123     return _compressed_class_space_size;

   124   }

   126   static void set_compressed_class_space_size(size_t size) {

   127     _compressed_class_space_size = size;

   128   }

   130   static size_t _first_chunk_word_size;

   131   static size_t _first_class_chunk_word_size;

   133   static size_t _commit_alignment;

   134   static size_t _reserve_alignment;

   136   SpaceManager* _vsm;

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

   139   SpaceManager* _class_vsm;

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

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

   143   // within a Metachunk and is used by

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

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

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

   148   static VirtualSpaceList* _space_list;

   149   static VirtualSpaceList* _class_space_list;

   151   static ChunkManager* _chunk_manager_metadata;

   152   static ChunkManager* _chunk_manager_class;

   154   static const MetaspaceTracer* _tracer;

   156  public:

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

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

   159   static VirtualSpaceList* get_space_list(MetadataType mdtype) {

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

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

   162   }

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

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

   166   static ChunkManager* get_chunk_manager(MetadataType mdtype) {

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

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

   169   }

   171   static const MetaspaceTracer* tracer() { return _tracer; }

   173  private:

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

   175   // maintain a single list for now.

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

   178 #ifdef _LP64

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

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

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

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

   186   static void initialize_class_space(ReservedSpace rs);

   187 #endif

   189   class AllocRecord : public CHeapObj<mtClass> {

   190   public:

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

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

   193     AllocRecord *_next;

   194     address _ptr;

   195     MetaspaceObj::Type _type;

   196     int _byte_size;

   197   };

   199   AllocRecord * _alloc_record_head;

   200   AllocRecord * _alloc_record_tail;

   202   size_t class_chunk_size(size_t word_size);

   204  public:

   206   Metaspace(Mutex* lock, MetaspaceType type);

   207   ~Metaspace();

   209   static void ergo_initialize();

   210   static void global_initialize();

   211   static void post_initialize();

   213   static size_t first_chunk_word_size() { return _first_chunk_word_size; }

   214   static size_t first_class_chunk_word_size() { return _first_class_chunk_word_size; }

   216   static size_t reserve_alignment()       { return _reserve_alignment; }

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

   218   static size_t commit_alignment()        { return _commit_alignment; }

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

   221   char*  bottom() const;

   222   size_t used_words_slow(MetadataType mdtype) const;

   223   size_t free_words_slow(MetadataType mdtype) const;

   224   size_t capacity_words_slow(MetadataType mdtype) const;

   226   size_t used_bytes_slow(MetadataType mdtype) const;

   227   size_t capacity_bytes_slow(MetadataType mdtype) const;

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

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

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

   233   MetaWord* expand_and_allocate(size_t size,

   234                                 MetadataType mdtype);

   236   static bool contains(const void* ptr);

   238   void dump(outputStream* const out) const;

   240   // Free empty virtualspaces

   241   static void purge(MetadataType mdtype);

   242   static void purge();

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

   245                                    MetaspaceObj::Type type, MetadataType mdtype, TRAPS);

   247   static const char* metadata_type_name(Metaspace::MetadataType mdtype);

   249   void print_on(outputStream* st) const;

   250   // Debugging support

   251   void verify();

   253   class AllocRecordClosure :  public StackObj {

   254   public:

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

   256   };

   258   void iterate(AllocRecordClosure *closure);

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

   261   static bool using_class_space() {

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

   263   }

   265   static bool is_class_space_allocation(MetadataType mdType) {

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

   267   }

   269 };

   271 class MetaspaceAux : AllStatic {

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

   274   // These methods iterate over the classloader data graph

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

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

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

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

   279   static size_t capacity_bytes_slow();

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

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

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

   284   // type of Metadata

   285   static size_t _capacity_words[Metaspace:: MetadataTypeCount];

   286   // Running sum of space in all Metachunks that

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

   288   // type of Metadata.

   289   static size_t _used_words[Metaspace:: MetadataTypeCount];

   291  public:

   292   // Decrement and increment _allocated_capacity_words

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

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

   296   // Decrement and increment _allocated_used_words

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

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

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

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

   302   // iterating over the classloader data graph

   303   static size_t used_bytes_slow() {

   304     return used_bytes_slow(Metaspace::ClassType) +

   305            used_bytes_slow(Metaspace::NonClassType);

   306   }

   308   // Used by MetaspaceCounters

   309   static size_t free_chunks_total_words();

   310   static size_t free_chunks_total_bytes();

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

   313   static size_t capacity_words(Metaspace::MetadataType mdtype) {

   314     return _capacity_words[mdtype];

   315   }

   316   static size_t capacity_words() {

   317     return capacity_words(Metaspace::NonClassType) +

   318            capacity_words(Metaspace::ClassType);

   319   }

   320   static size_t capacity_bytes(Metaspace::MetadataType mdtype) {

   321     return capacity_words(mdtype) * BytesPerWord;

   322   }

   323   static size_t capacity_bytes() {

   324     return capacity_words() * BytesPerWord;

   325   }

   327   static size_t used_words(Metaspace::MetadataType mdtype) {

   328     return _used_words[mdtype];

   329   }

   330   static size_t used_words() {

   331     return used_words(Metaspace::NonClassType) +

   332            used_words(Metaspace::ClassType);

   333   }

   334   static size_t used_bytes(Metaspace::MetadataType mdtype) {

   335     return used_words(mdtype) * BytesPerWord;

   336   }

   337   static size_t used_bytes() {

   338     return used_words() * BytesPerWord;

   339   }

   341   static size_t free_bytes();

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

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

   345   static size_t reserved_bytes() {

   346     return reserved_bytes(Metaspace::ClassType) +

   347            reserved_bytes(Metaspace::NonClassType);

   348   }

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

   351   static size_t committed_bytes() {

   352     return committed_bytes(Metaspace::ClassType) +

   353            committed_bytes(Metaspace::NonClassType);

   354   }

   356   static size_t min_chunk_size_words();

   357   static size_t min_chunk_size_bytes() {

   358     return min_chunk_size_words() * BytesPerWord;

   359   }

   361   static bool has_chunk_free_list(Metaspace::MetadataType mdtype);

   362   static MetaspaceChunkFreeListSummary chunk_free_list_summary(Metaspace::MetadataType mdtype);

   364   // Print change in used metadata.

   365   static void print_metaspace_change(size_t prev_metadata_used);

   366   static void print_on(outputStream * out);

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

   369   static void print_class_waste(outputStream* out);

   370   static void print_waste(outputStream* out);

   371   static void dump(outputStream* out);

   372   static void verify_free_chunks();

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

   374   // capacity_bytes_slow() are the same.

   375   static void verify_capacity();

   376   static void verify_used();

   377   static void verify_metrics();

   378 };

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

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

   382 // Metaspaces.

   384 class MetaspaceGC : AllStatic {

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

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

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

   389   static volatile intptr_t _capacity_until_GC;

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

   392   // be started.

   393   static bool _should_concurrent_collect;

   395   static uint _shrink_factor;

   397   static size_t shrink_factor() { return _shrink_factor; }

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

   400  public:

   402   static void initialize();

   403   static void post_initialize();

   405   static size_t capacity_until_GC();

   406   static size_t inc_capacity_until_GC(size_t v);

   407   static size_t dec_capacity_until_GC(size_t v);

   409   static bool should_concurrent_collect() { return _should_concurrent_collect; }

   410   static void set_should_concurrent_collect(bool v) {

   411     _should_concurrent_collect = v;

   412   }

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

   415   static size_t delta_capacity_until_GC(size_t bytes);

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

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

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

   421   // measured in words.

   422   static size_t allowed_expansion();

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

   425   // a GC.

   426   static void compute_new_size();

   427 };

   429 #endif // SHARE_VM_MEMORY_METASPACE_HPP

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

src/share/vm/memory/metaspace.hpp@9fec19bb0659

src/share/vm/memory/metaspace.hpp