jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/shared/collectorCounters.hpp@595c0f60d50d

8029075: String deduplication in G1
Summary: Implementation of JEP 192, http://openjdk.java.net/jeps/192
Reviewed-by: brutisso, tschatzl, coleenp

     1 /*

     2  * Copyright (c) 2002, 2012, 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  */

    25 #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_COLLECTORCOUNTERS_HPP

    26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_COLLECTORCOUNTERS_HPP

    28 #include "runtime/perfData.hpp"

    30 // CollectorCounters is a holder class for performance counters

    31 // that track a collector

    33 class CollectorCounters: public CHeapObj<mtGC> {

    34   friend class VMStructs;

    36   private:

    37     PerfCounter*      _invocations;

    38     PerfCounter*      _time;

    39     PerfVariable*     _last_entry_time;

    40     PerfVariable*     _last_exit_time;

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

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

    44     // PerfStringConstant*     _name;

    46     char*             _name_space;

    48   public:

    50     CollectorCounters(const char* name, int ordinal);

    52     ~CollectorCounters() {

    53       if (_name_space != NULL) FREE_C_HEAP_ARRAY(char, _name_space, mtGC);

    54     }

    56     inline PerfCounter* invocation_counter() const  { return _invocations; }

    58     inline PerfCounter* time_counter() const        { return _time; }

    60     inline PerfVariable* last_entry_counter() const { return _last_entry_time; }

    62     inline PerfVariable* last_exit_counter() const  { return _last_exit_time; }

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

    65 };

    67 class TraceCollectorStats: public PerfTraceTimedEvent {

    69   protected:

    70     CollectorCounters* _c;

    72   public:

    73     inline TraceCollectorStats(CollectorCounters* c) :

    74            PerfTraceTimedEvent(c->time_counter(), c->invocation_counter()),

    75            _c(c) {

    77       if (UsePerfData) {

    78          _c->last_entry_counter()->set_value(os::elapsed_counter());

    79       }

    80     }

    82     inline ~TraceCollectorStats() {

    83       if (UsePerfData) _c->last_exit_counter()->set_value(os::elapsed_counter());

    84     }

    85 };

    87 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_COLLECTORCOUNTERS_HPP

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