1 /*

     2  * Copyright (c) 2011, 2015, 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_G1_HSPACECOUNTERS_HPP

    26 #define SHARE_VM_GC_G1_HSPACECOUNTERS_HPP

    27 

    28 #include "gc/shared/generation.hpp"

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

    30 #include "runtime/perfData.hpp"

    31 #include "utilities/macros.hpp"

    32 

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

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

    35 

    36 class HeapSpaceUsedHelper;

    37 class G1SpaceMonitoringSupport;

    38 

    39 class HSpaceCounters: public CHeapObj<mtGC> {

    40   friend class VMStructs;

    41 

    42  private:

    43   PerfVariable*        _capacity;

    44   PerfVariable*        _used;

    45 

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

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

    48 

    49   char*             _name_space;

    50 

    51  public:

    52 

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

    54                  size_t initial_capacity, GenerationCounters* gc);

    55 

    56   ~HSpaceCounters() {

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

    58   }

    59 

    60   inline void update_capacity(size_t v) {

    61     _capacity->set_value(v);

    62   }

    63 

    64   inline void update_used(size_t v) {

    65     _used->set_value(v);

    66   }

    67 

    68   debug_only(

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

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

    71     jlong used() {

    72       return _used->get_value();

    73     }

    74     jlong capacity() {

    75       return _used->get_value();

    76     }

    77   )

    78 

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

    80     update_capacity(capacity);

    81     update_used(used);

    82   }

    83 

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

    85 };

    86 #endif // SHARE_VM_GC_G1_HSPACECOUNTERS_HPP