jdk8-mips64-public/hotspot: src/share/vm/memory/metaspace.hpp@6acf14e730dd

8072725: Provide more granular levels for GC verification
Summary: Add option VerifySubSet to selectively verify the memory sub-systems
Reviewed-by: kevinw, jmasa

     1 /*

     2  * Copyright (c) 2011, 2014, 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 "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   // These 2 methods are 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);

   177   void record_deallocation(void* ptr, size_t word_size);

   179 #ifdef _LP64

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

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

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

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

   187   static void initialize_class_space(ReservedSpace rs);

   188 #endif

   190   class AllocRecord : public CHeapObj<mtClass> {

   191   public:

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

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

   194     AllocRecord *_next;

   195     address _ptr;

   196     MetaspaceObj::Type _type;

   197     int _byte_size;

   198   };

   200   AllocRecord * _alloc_record_head;

   201   AllocRecord * _alloc_record_tail;

   203   size_t class_chunk_size(size_t word_size);

   205  public:

   207   Metaspace(Mutex* lock, MetaspaceType type);

   208   ~Metaspace();

   210   static void ergo_initialize();

   211   static void global_initialize();

   212   static void post_initialize();

   214   static size_t first_chunk_word_size() { return _first_chunk_word_size; }

   215   static size_t first_class_chunk_word_size() { return _first_class_chunk_word_size; }

   217   static size_t reserve_alignment()       { return _reserve_alignment; }

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

   219   static size_t commit_alignment()        { return _commit_alignment; }

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

   222   char*  bottom() const;

   223   size_t used_words_slow(MetadataType mdtype) const;

   224   size_t free_words_slow(MetadataType mdtype) const;

   225   size_t capacity_words_slow(MetadataType mdtype) const;

   227   size_t used_bytes_slow(MetadataType mdtype) const;

   228   size_t capacity_bytes_slow(MetadataType mdtype) const;

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

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

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

   234   MetaWord* expand_and_allocate(size_t size,

   235                                 MetadataType mdtype);

   237   static bool contains(const void* ptr);

   239   void dump(outputStream* const out) const;

   241   // Free empty virtualspaces

   242   static void purge(MetadataType mdtype);

   243   static void purge();

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

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

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

   250   void print_on(outputStream* st) const;

   251   // Debugging support

   252   void verify();

   254   class AllocRecordClosure :  public StackObj {

   255   public:

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

   257   };

   259   void iterate(AllocRecordClosure *closure);

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

   262   static bool using_class_space() {

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

   264   }

   266   static bool is_class_space_allocation(MetadataType mdType) {

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

   268   }

   270 };

   272 class MetaspaceAux : AllStatic {

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

   275   // These methods iterate over the classloader data graph

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

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

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

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

   280   static size_t capacity_bytes_slow();

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

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

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

   285   // type of Metadata

   286   static size_t _capacity_words[Metaspace:: MetadataTypeCount];

   287   // Running sum of space in all Metachunks that

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

   289   // type of Metadata.

   290   static size_t _used_words[Metaspace:: MetadataTypeCount];

   292  public:

   293   // Decrement and increment _allocated_capacity_words

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

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

   297   // Decrement and increment _allocated_used_words

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

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

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

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

   303   // iterating over the classloader data graph

   304   static size_t used_bytes_slow() {

   305     return used_bytes_slow(Metaspace::ClassType) +

   306            used_bytes_slow(Metaspace::NonClassType);

   307   }

   309   // Used by MetaspaceCounters

   310   static size_t free_chunks_total_words();

   311   static size_t free_chunks_total_bytes();

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

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

   315     return _capacity_words[mdtype];

   316   }

   317   static size_t capacity_words() {

   318     return capacity_words(Metaspace::NonClassType) +

   319            capacity_words(Metaspace::ClassType);

   320   }

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

   322     return capacity_words(mdtype) * BytesPerWord;

   323   }

   324   static size_t capacity_bytes() {

   325     return capacity_words() * BytesPerWord;

   326   }

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

   329     return _used_words[mdtype];

   330   }

   331   static size_t used_words() {

   332     return used_words(Metaspace::NonClassType) +

   333            used_words(Metaspace::ClassType);

   334   }

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

   336     return used_words(mdtype) * BytesPerWord;

   337   }

   338   static size_t used_bytes() {

   339     return used_words() * BytesPerWord;

   340   }

   342   static size_t free_bytes();

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

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

   346   static size_t reserved_bytes() {

   347     return reserved_bytes(Metaspace::ClassType) +

   348            reserved_bytes(Metaspace::NonClassType);

   349   }

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

   352   static size_t committed_bytes() {

   353     return committed_bytes(Metaspace::ClassType) +

   354            committed_bytes(Metaspace::NonClassType);

   355   }

   357   static size_t min_chunk_size_words();

   358   static size_t min_chunk_size_bytes() {

   359     return min_chunk_size_words() * BytesPerWord;

   360   }

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

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

   365   // Print change in used metadata.

   366   static void print_metaspace_change(size_t prev_metadata_used);

   367   static void print_on(outputStream * out);

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

   370   static void print_class_waste(outputStream* out);

   371   static void print_waste(outputStream* out);

   372   static void dump(outputStream* out);

   373   static void verify_free_chunks();

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

   375   // capacity_bytes_slow() are the same.

   376   static void verify_capacity();

   377   static void verify_used();

   378   static void verify_metrics();

   379 };

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

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

   383 // Metaspaces.

   385 class MetaspaceGC : AllStatic {

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

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

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

   390   static volatile intptr_t _capacity_until_GC;

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

   393   // be started.

   394   static bool _should_concurrent_collect;

   396   static uint _shrink_factor;

   398   static size_t shrink_factor() { return _shrink_factor; }

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

   401  public:

   403   static void initialize();

   404   static void post_initialize();

   406   static size_t capacity_until_GC();

   407   static bool inc_capacity_until_GC(size_t v,

   408                                     size_t* new_cap_until_GC = NULL,

   409                                     size_t* old_cap_until_GC = NULL);

   410   static size_t dec_capacity_until_GC(size_t v);

   412   static bool should_concurrent_collect() { return _should_concurrent_collect; }

   413   static void set_should_concurrent_collect(bool v) {

   414     _should_concurrent_collect = v;

   415   }

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

   418   static size_t delta_capacity_until_GC(size_t bytes);

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

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

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

   424   // measured in words.

   425   static size_t allowed_expansion();

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

   428   // a GC.

   429   static void compute_new_size();

   430 };

   432 #endif // SHARE_VM_MEMORY_METASPACE_HPP

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

src/share/vm/memory/metaspace.hpp@6acf14e730dd

src/share/vm/memory/metaspace.hpp