jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/shared/gSpaceCounters.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 GSpaceCounter is a holder class for performance counters

    26 // that track a space;

    28 class GSpaceCounters: 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   Generation*       _gen;

    40   char*             _name_space;

    42  public:

    44   GSpaceCounters(const char* name, int ordinal, size_t max_size, Generation* g,

    45                  GenerationCounters* gc, bool sampled=true);

    47   ~GSpaceCounters() {

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

    49   }

    51   inline void update_capacity() {

    52     _capacity->set_value(_gen->capacity());

    53   }

    55   inline void update_used() {

    56     _used->set_value(_gen->used());

    57   }

    59   // special version of update_used() to allow the used value to be

    60   // passed as a parameter. This method can can be used in cases were

    61   // the  utilization is already known and/or when the _gen->used()

    62   // method is known to be expensive and we want to avoid unnecessary

    63   // calls to it.

    64   //

    65   inline void update_used(size_t used) {

    66     _used->set_value(used);

    67   }

    69   inline void inc_used(size_t size) {

    70     _used->inc(size);

    71   }

    73   debug_only(

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

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

    76     jlong used() {

    77       return _used->get_value();

    78     }

    79     jlong capacity() {

    80       return _used->get_value();

    81     }

    82   )

    84   inline void update_all() {

    85     update_used();

    86     update_capacity();

    87   }

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

    90 };

    92 class GenerationUsedHelper : public PerfLongSampleHelper {

    93   private:

    94     Generation* _gen;

    96   public:

    97     GenerationUsedHelper(Generation* g) : _gen(g) { }

    99     inline jlong take_sample() {

   100       return _gen->used();

   101     }

   102 };

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

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

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