1 /*

     2  * Copyright (c) 2011, 2017, 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_SHARED_HSPACECOUNTERS_HPP

    26 #define SHARE_VM_GC_SHARED_HSPACECOUNTERS_HPP

    27 

    28 #include "memory/allocation.hpp"

    29 #include "runtime/perfData.hpp"

    30 #include "utilities/macros.hpp"

    31 

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

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

    34 

    35 class HSpaceCounters: public CHeapObj<mtGC> {

    36   friend class VMStructs;

    37 

    38  private:

    39   PerfVariable* _capacity;

    40   PerfVariable* _used;

    41 

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

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

    44 

    45   char*         _name_space;

    46 

    47  public:

    48 

    49   HSpaceCounters(const char* name_space, const char* name, int ordinal,

    50                  size_t max_size, size_t initial_capacity);

    51 

    52   ~HSpaceCounters();

    53 

    54   void update_capacity(size_t v);

    55   void update_used(size_t v);

    56 

    57   void update_all(size_t capacity, size_t used);

    58 

    59   debug_only(

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

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

    62     jlong used();

    63     jlong capacity();

    64   )

    65 

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

    67 };

    68 #endif // SHARE_VM_GC_SHARED_HSPACECOUNTERS_HPP