jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/shared/cSpaceCounters.hpp@aaf61e68b255

6818524: G1: use ergonomic resizing of PLABs
Summary: Employ PLABStats instances to record information about survivor and old PLABs, and use the recorded stats to adjust the sizes of survivor and old PLABS.
Reviewed-by: johnc, ysr
Contributed-by: Brandon Mitchell <brandon@twitter.com>

     1 /*

     2  * Copyright (c) 2002, 2010, 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_CSPACECOUNTERS_HPP

    26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_CSPACECOUNTERS_HPP

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

    29 #include "memory/space.inline.hpp"

    30 #include "runtime/perfData.hpp"

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

    33 // that track a space;

    35 class CSpaceCounters: public CHeapObj<mtGC> {

    36   friend class VMStructs;

    38  private:

    39   PerfVariable*      _capacity;

    40   PerfVariable*      _used;

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

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

    44   // PerfConstant*     _size;

    46   ContiguousSpace*     _space;

    47   char*                _name_space;

    49  public:

    51   CSpaceCounters(const char* name, int ordinal, size_t max_size,

    52                  ContiguousSpace* s, GenerationCounters* gc);

    54   ~CSpaceCounters() {

    55       if (_name_space != NULL) FREE_C_HEAP_ARRAY(char, _name_space, mtInternal);

    56   }

    58   inline void update_capacity() {

    59     _capacity->set_value(_space->capacity());

    60   }

    62   inline void update_used() {

    63     _used->set_value(_space->used());

    64   }

    66   inline void update_all() {

    67     update_used();

    68     update_capacity();

    69   }

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

    72 };

    74 class ContiguousSpaceUsedHelper : public PerfLongSampleHelper {

    75   private:

    76     ContiguousSpace* _space;

    78   public:

    79     ContiguousSpaceUsedHelper(ContiguousSpace* space) : _space(space) { }

    81     inline jlong take_sample() {

    82       return _space->used();

    83     }

    84 };

    86 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_CSPACECOUNTERS_HPP

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/gc_implementation/shared/cSpaceCounters.hpp@aaf61e68b255

src/share/vm/gc_implementation/shared/cSpaceCounters.hpp