jdk8-mips64-public/hotspot: src/share/vm/memory/metaspace.hpp@bc7714614ad8

8036699: Add trace event when a metaspace allocation fails
Reviewed-by: jmasa, stefank

     1 /*

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     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

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     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  *

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    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

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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 MetaspaceTracer;

    64 class MetaWord;

    65 class Mutex;

    66 class outputStream;

    67 class SpaceManager;

    68 class VirtualSpaceList;

    70 // Metaspaces each have a  SpaceManager and allocations

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

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

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

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

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

    76 // also manages freelists of available Chunks.

    77 //

    78 // Currently the space manager maintains the list of

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

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

    81 // quantum of metadata.

    83 class Metaspace : public CHeapObj<mtClass> {

    84   friend class VMStructs;

    85   friend class SpaceManager;

    86   friend class VM_CollectForMetadataAllocation;

    87   friend class MetaspaceGC;

    88   friend class MetaspaceAux;

    90  public:

    91   enum MetadataType {

    92     ClassType,

    93     NonClassType,

    94     MetadataTypeCount

    95   };

    96   enum MetaspaceType {

    97     StandardMetaspaceType,

    98     BootMetaspaceType,

    99     ROMetaspaceType,

   100     ReadWriteMetaspaceType,

   101     AnonymousMetaspaceType,

   102     ReflectionMetaspaceType

   103   };

   105  private:

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

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

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

   110   // class loader and anonymous class loader.

   111   Metachunk* get_initialization_chunk(MetadataType mdtype,

   112                                       size_t chunk_word_size,

   113                                       size_t chunk_bunch);

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

   116   static size_t align_word_size_up(size_t);

   118   // Aligned size of the metaspace.

   119   static size_t _compressed_class_space_size;

   121   static size_t compressed_class_space_size() {

   122     return _compressed_class_space_size;

   123   }

   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   static const MetaspaceTracer* _tracer;

   154  public:

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

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

   157   static VirtualSpaceList* get_space_list(MetadataType mdtype) {

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

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

   160   }

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

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

   164   static ChunkManager* get_chunk_manager(MetadataType mdtype) {

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

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

   167   }

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

   171  private:

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

   173   // maintain a single list for now.

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

   176 #ifdef _LP64

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

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

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

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

   184   static void initialize_class_space(ReservedSpace rs);

   185 #endif

   187   class AllocRecord : public CHeapObj<mtClass> {

   188   public:

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

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

   191     AllocRecord *_next;

   192     address _ptr;

   193     MetaspaceObj::Type _type;

   194     int _byte_size;

   195   };

   197   AllocRecord * _alloc_record_head;

   198   AllocRecord * _alloc_record_tail;

   200   size_t class_chunk_size(size_t word_size);

   202  public:

   204   Metaspace(Mutex* lock, MetaspaceType type);

   205   ~Metaspace();

   207   static void ergo_initialize();

   208   static void global_initialize();

   210   static size_t first_chunk_word_size() { return _first_chunk_word_size; }

   211   static size_t first_class_chunk_word_size() { return _first_class_chunk_word_size; }

   213   static size_t reserve_alignment()       { return _reserve_alignment; }

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

   215   static size_t commit_alignment()        { return _commit_alignment; }

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

   218   char*  bottom() const;

   219   size_t used_words_slow(MetadataType mdtype) const;

   220   size_t free_words_slow(MetadataType mdtype) const;

   221   size_t capacity_words_slow(MetadataType mdtype) const;

   223   size_t used_bytes_slow(MetadataType mdtype) const;

   224   size_t capacity_bytes_slow(MetadataType mdtype) const;

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

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

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

   230   MetaWord* expand_and_allocate(size_t size,

   231                                 MetadataType mdtype);

   233   bool contains(const void* ptr);

   234   void dump(outputStream* const out) const;

   236   // Free empty virtualspaces

   237   static void purge(MetadataType mdtype);

   238   static void purge();

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

   241                                    MetadataType mdtype, TRAPS);

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

   245   void print_on(outputStream* st) const;

   246   // Debugging support

   247   void verify();

   249   class AllocRecordClosure :  public StackObj {

   250   public:

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

   252   };

   254   void iterate(AllocRecordClosure *closure);

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

   257   static bool using_class_space() {

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

   259   }

   261   static bool is_class_space_allocation(MetadataType mdType) {

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

   263   }

   265 };

   267 class MetaspaceAux : AllStatic {

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

   270   // These methods iterate over the classloader data graph

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

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

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

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

   275   static size_t capacity_bytes_slow();

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

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

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

   280   // type of Metadata

   281   static size_t _allocated_capacity_words[Metaspace:: MetadataTypeCount];

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

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

   284   // type of Metadata.

   285   static size_t _allocated_used_words[Metaspace:: MetadataTypeCount];

   287  public:

   288   // Decrement and increment _allocated_capacity_words

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

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

   292   // Decrement and increment _allocated_used_words

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

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

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

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

   298   // iterating over the classloader data graph

   299   static size_t used_bytes_slow() {

   300     return used_bytes_slow(Metaspace::ClassType) +

   301            used_bytes_slow(Metaspace::NonClassType);

   302   }

   304   // Used by MetaspaceCounters

   305   static size_t free_chunks_total_words();

   306   static size_t free_chunks_total_bytes();

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

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

   310     return _allocated_capacity_words[mdtype];

   311   }

   312   static size_t allocated_capacity_words() {

   313     return allocated_capacity_words(Metaspace::NonClassType) +

   314            allocated_capacity_words(Metaspace::ClassType);

   315   }

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

   317     return allocated_capacity_words(mdtype) * BytesPerWord;

   318   }

   319   static size_t allocated_capacity_bytes() {

   320     return allocated_capacity_words() * BytesPerWord;

   321   }

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

   324     return _allocated_used_words[mdtype];

   325   }

   326   static size_t allocated_used_words() {

   327     return allocated_used_words(Metaspace::NonClassType) +

   328            allocated_used_words(Metaspace::ClassType);

   329   }

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

   331     return allocated_used_words(mdtype) * BytesPerWord;

   332   }

   333   static size_t allocated_used_bytes() {

   334     return allocated_used_words() * BytesPerWord;

   335   }

   337   static size_t free_bytes();

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

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

   341   static size_t reserved_bytes() {

   342     return reserved_bytes(Metaspace::ClassType) +

   343            reserved_bytes(Metaspace::NonClassType);

   344   }

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

   347   static size_t committed_bytes() {

   348     return committed_bytes(Metaspace::ClassType) +

   349            committed_bytes(Metaspace::NonClassType);

   350   }

   352   static size_t min_chunk_size_words();

   353   static size_t min_chunk_size_bytes() {

   354     return min_chunk_size_words() * BytesPerWord;

   355   }

   357   // Print change in used metadata.

   358   static void print_metaspace_change(size_t prev_metadata_used);

   359   static void print_on(outputStream * out);

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

   362   static void print_class_waste(outputStream* out);

   363   static void print_waste(outputStream* out);

   364   static void dump(outputStream* out);

   365   static void verify_free_chunks();

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

   367   // capacity_bytes_slow() are the same.

   368   static void verify_capacity();

   369   static void verify_used();

   370   static void verify_metrics();

   371 };

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

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

   375 // Metaspaces.

   377 class MetaspaceGC : AllStatic {

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

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

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

   382   static volatile intptr_t _capacity_until_GC;

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

   385   // be started.

   386   static bool _should_concurrent_collect;

   388   static uint _shrink_factor;

   390   static size_t shrink_factor() { return _shrink_factor; }

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

   393  public:

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

   397   static size_t capacity_until_GC();

   398   static size_t inc_capacity_until_GC(size_t v);

   399   static size_t dec_capacity_until_GC(size_t v);

   401   static bool should_concurrent_collect() { return _should_concurrent_collect; }

   402   static void set_should_concurrent_collect(bool v) {

   403     _should_concurrent_collect = v;

   404   }

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

   407   static size_t delta_capacity_until_GC(size_t bytes);

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

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

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

   413   // measured in words.

   414   static size_t allowed_expansion();

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

   417   // a GC.

   418   static void compute_new_size();

   419 };

   421 #endif // SHARE_VM_MEMORY_METASPACE_HPP

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

src/share/vm/memory/metaspace.hpp@bc7714614ad8

src/share/vm/memory/metaspace.hpp