jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/shared/ageTable.hpp@a61af66fc99e

     1 /*

     2  * Copyright 1997-2003 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

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    25 /* Copyright 1992 Sun Microsystems, Inc. and Stanford University.

    26    See the LICENSE file for license information. */

    28 // Age table for adaptive feedback-mediated tenuring (scavenging)

    29 //

    30 // Note: all sizes are in oops

    32 class ageTable VALUE_OBJ_CLASS_SPEC {

    33   friend class VMStructs;

    35  public:

    36   // constants

    37   enum { table_size = markOopDesc::max_age + 1 };

    39   // instance variables

    40   size_t sizes[table_size];

    42   // constructor.  "global" indicates that this is the global age table

    43   // (as opposed to gc-thread-local)

    44   ageTable(bool global = true);

    46   // clear table

    47   void clear();

    49   // add entry

    50   void add(oop p, size_t oop_size) {

    51     int age = p->age();

    52     assert(age > 0 && age < table_size, "invalid age of object");

    53     sizes[age] += oop_size;

    54   }

    56   // Merge another age table with the current one.  Used

    57   // for parallel young generation gc.

    58   void merge(ageTable* subTable);

    60   // calculate new tenuring threshold based on age information

    61   int compute_tenuring_threshold(size_t survivor_capacity);

    63  private:

    64   PerfVariable* _perf_sizes[table_size];

    65 };

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