1 /*

     2  * Copyright (c) 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 

    25 #ifndef SHARE_VM_SERVICES_MEM_TRACK_WORKER_HPP

    26 #define SHARE_VM_SERVICES_MEM_TRACK_WORKER_HPP

    27 

    28 #include "memory/allocation.hpp"

    29 #include "runtime/thread.hpp"

    30 #include "services/memRecorder.hpp"

    31 

    32 // Maximum MAX_GENERATIONS generation data can be tracked.

    33 #define MAX_GENERATIONS  512

    34 

    35 class GenerationData VALUE_OBJ_CLASS_SPEC {

    36  private:

    37   int           _number_of_classes;

    38   MemRecorder*  _recorder_list;

    39 

    40  public:

    41   GenerationData(): _number_of_classes(0), _recorder_list(NULL) { }

    42 

    43   inline int  number_of_classes() const { return _number_of_classes; }

    44   inline void set_number_of_classes(long num) { _number_of_classes = num; }

    45 

    46   inline MemRecorder* next_recorder() {

    47     if (_recorder_list == NULL) {

    48       return NULL;

    49     } else {

    50       MemRecorder* tmp = _recorder_list;

    51       _recorder_list = _recorder_list->next();

    52       return tmp;

    53     }

    54   }

    55 

    56   inline bool has_more_recorder() const {

    57     return (_recorder_list != NULL);

    58   }

    59 

    60   // add recorders to this generation

    61   void add_recorders(MemRecorder* head) {

    62     if (head != NULL) {

    63       if (_recorder_list == NULL) {

    64         _recorder_list = head;

    65       } else {

    66         MemRecorder* tmp = _recorder_list;

    67         for (; tmp->next() != NULL; tmp = tmp->next());

    68         tmp->set_next(head);

    69       }

    70     }

    71   }

    72 

    73   void reset();

    74 

    75   NOT_PRODUCT(MemRecorder* peek() const { return _recorder_list; })

    76 };

    77 

    78 class MemTrackWorker : public NamedThread {

    79  private:

    80   // circular buffer. This buffer contains generation data to be merged into global

    81   // snaphsot.

    82   // Each slot holds a generation

    83   GenerationData  _gen[MAX_GENERATIONS];

    84   int             _head, _tail; // head and tail pointers to above circular buffer

    85 

    86   bool            _has_error;

    87 

    88   MemSnapshot*    _snapshot;

    89 

    90  public:

    91   MemTrackWorker(MemSnapshot* snapshot);

    92   ~MemTrackWorker();

    93   _NOINLINE_ void* operator new(size_t size) throw();

    94   _NOINLINE_ void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw();

    95 

    96   void start();

    97   void run();

    98 

    99   inline bool has_error() const { return _has_error; }

   100 

   101   // task at synchronization point

   102   void at_sync_point(MemRecorder* pending_recorders, int number_of_classes);

   103 

   104   // for debugging purpose, they are not thread safe.

   105   NOT_PRODUCT(static int count_recorder(const MemRecorder* head);)

   106   NOT_PRODUCT(int count_pending_recorders() const;)

   107 

   108   NOT_PRODUCT(int _sync_point_count;)

   109   NOT_PRODUCT(int _merge_count;)

   110   NOT_PRODUCT(int _last_gen_in_use;)

   111 

   112   // how many generations are queued

   113   inline int generations_in_use() const {

   114     return (_tail >= _head ? (_tail - _head + 1) : (MAX_GENERATIONS - (_head - _tail) + 1));

   115   }

   116 };

   117 

   118 #endif // SHARE_VM_SERVICES_MEM_TRACK_WORKER_HPP