1 /*

     2  * Copyright (c) 2011, 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_GC_IMPLEMENTATION_SHARED_HSPACECOUNTERS_HPP

    26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_HSPACECOUNTERS_HPP

    27 

    28 #ifndef SERIALGC

    29 #include "gc_implementation/shared/generationCounters.hpp"

    30 #include "memory/generation.hpp"

    31 #include "runtime/perfData.hpp"

    32 #endif

    33 

    34 // A HSpaceCounter is a holder class for performance counters

    35 // that track a collections (logical spaces) in a heap;

    36 

    37 class HeapSpaceUsedHelper;

    38 class G1SpaceMonitoringSupport;

    39 

    40 class HSpaceCounters: public CHeapObj {

    41   friend class VMStructs;

    42 

    43  private:

    44   PerfVariable*        _capacity;

    45   PerfVariable*        _used;

    46 

    47   // Constant PerfData types don't need to retain a reference.

    48   // However, it's a good idea to document them here.

    49 

    50   char*             _name_space;

    51 

    52  public:

    53 

    54   HSpaceCounters(const char* name, int ordinal, size_t max_size,

    55                  size_t initial_capacity, GenerationCounters* gc);

    56 

    57   ~HSpaceCounters() {

    58     if (_name_space != NULL) FREE_C_HEAP_ARRAY(char, _name_space);

    59   }

    60 

    61   inline void update_capacity(size_t v) {

    62     _capacity->set_value(v);

    63   }

    64 

    65   inline void update_used(size_t v) {

    66     _used->set_value(v);

    67   }

    68 

    69   debug_only(

    70     // for security reasons, we do not allow arbitrary reads from

    71     // the counters as they may live in shared memory.

    72     jlong used() {

    73       return _used->get_value();

    74     }

    75     jlong capacity() {

    76       return _used->get_value();

    77     }

    78   )

    79 

    80   inline void update_all(size_t capacity, size_t used) {

    81     update_capacity(capacity);

    82     update_used(used);

    83   }

    84 

    85   const char* name_space() const        { return _name_space; }

    86 };

    87 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_HSPACECOUNTERS_HPP