|
/*
* Copyright (c) 1997, 2021, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#ifndef SHARE_GC_SHARED_AGETABLE_HPP
#define SHARE_GC_SHARED_AGETABLE_HPP
#include "oops/markWord.hpp"
#include "oops/oop.hpp"
#include "runtime/perfDataTypes.hpp"
/* Copyright (c) 1992, 2021, Oracle and/or its affiliates, and Stanford University.
See the LICENSE file for license information. */
// Age table for adaptive feedback-mediated tenuring (scavenging)
//
// Note: all sizes are in oops
class AgeTable {
friend class VMStructs;
public:
// constants
enum { table_size = markWord::max_age + 1 };
// instance variables
size_t sizes[table_size];
// constructor. "global" indicates that this is the global age table
// (as opposed to gc-thread-local)
AgeTable(bool global = true);
// clear table
void clear();
// add entry
inline void add(oop p, size_t oop_size);
void add(uint age, size_t oop_size) {
assert(age > 0 && age < table_size, "invalid age of object");
sizes[age] += oop_size;
}
// Merge another age table with the current one. Used
// for parallel young generation gc.
void merge(AgeTable* subTable);
// Calculate new tenuring threshold based on age information.
uint compute_tenuring_threshold(size_t desired_survivor_size);
void print_age_table(uint tenuring_threshold);
private:
PerfVariable* _perf_sizes[table_size];
};
#endif // SHARE_GC_SHARED_AGETABLE_HPP
¤ Dauer der Verarbeitung: 0.16 Sekunden
(vorverarbeitet)
¤
|
Haftungshinweis
Die Informationen auf dieser Webseite wurden
nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit,
noch Qualität der bereit gestellten Informationen zugesichert.
Bemerkung:
Die farbliche Syntaxdarstellung ist noch experimentell.
|
