66 lines
2.1 KiB
C++
66 lines
2.1 KiB
C++
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/*
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* Copyright 1997-2003 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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/* Copyright 1992 Sun Microsystems, Inc. and Stanford University.
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See the LICENSE file for license information. */
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// Age table for adaptive feedback-mediated tenuring (scavenging)
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//
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// Note: all sizes are in oops
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class ageTable VALUE_OBJ_CLASS_SPEC {
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friend class VMStructs;
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public:
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// constants
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enum { table_size = markOopDesc::max_age + 1 };
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// instance variables
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size_t sizes[table_size];
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// constructor. "global" indicates that this is the global age table
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// (as opposed to gc-thread-local)
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ageTable(bool global = true);
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// clear table
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void clear();
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// add entry
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void add(oop p, size_t oop_size) {
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int age = p->age();
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assert(age > 0 && age < table_size, "invalid age of object");
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sizes[age] += oop_size;
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}
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// Merge another age table with the current one. Used
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// for parallel young generation gc.
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void merge(ageTable* subTable);
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// calculate new tenuring threshold based on age information
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int compute_tenuring_threshold(size_t survivor_capacity);
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private:
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PerfVariable* _perf_sizes[table_size];
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};
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