jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/shared/spaceCounters.hpp@0bfd3fb24150

6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
Summary: Ensure a full GC that clears SoftReferences before throwing an out-of-memory
Reviewed-by: ysr, jcoomes

     1 /*

     2  * Copyright 2002-2004 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    25 // A SpaceCounter is a holder class for performance counters

    26 // that track a space;

    28 class SpaceCounters: public CHeapObj {

    29   friend class VMStructs;

    31  private:

    32   PerfVariable*      _capacity;

    33   PerfVariable*      _used;

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

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

    37   // PerfConstant*     _size;

    39   MutableSpace*     _object_space;

    40   char*             _name_space;

    42  public:

    44   SpaceCounters(const char* name, int ordinal, size_t max_size,

    45                 MutableSpace* m, GenerationCounters* gc);

    47   ~SpaceCounters() {

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

    49   }

    51   inline void update_capacity() {

    52     _capacity->set_value(_object_space->capacity_in_bytes());

    53   }

    55   inline void update_used() {

    56     _used->set_value(_object_space->used_in_bytes());

    57   }

    59   inline void update_all() {

    60     update_used();

    61     update_capacity();

    62   }

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

    65 };

    67 class MutableSpaceUsedHelper: public PerfLongSampleHelper {

    68   private:

    69     MutableSpace* _m;

    71   public:

    72     MutableSpaceUsedHelper(MutableSpace* m) : _m(m) { }

    74     inline jlong take_sample() {

    75       return _m->used_in_bytes();

    76     }

    77 };

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

src/share/vm/gc_implementation/shared/spaceCounters.hpp@0bfd3fb24150

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