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77 lines
2.4 KiB
C++
77 lines
2.4 KiB
C++
/*
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* Copyright (c) 1997, 2019, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_GC_SHARED_AGETABLE_HPP
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#define SHARE_GC_SHARED_AGETABLE_HPP
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#include "oops/markWord.hpp"
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#include "oops/oop.hpp"
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#include "runtime/perfData.hpp"
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/* Copyright (c) 1992, 2019, Oracle and/or its affiliates, 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 {
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friend class VMStructs;
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public:
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// constants
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enum { table_size = markWord::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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inline void add(oop p, size_t oop_size);
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void add(uint age, size_t oop_size) {
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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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uint compute_tenuring_threshold(size_t desired_survivor_size);
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void print_age_table(uint tenuring_threshold);
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private:
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PerfVariable* _perf_sizes[table_size];
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};
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#endif // SHARE_GC_SHARED_AGETABLE_HPP
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