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1 /*
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2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 /* Copyright 1992-2009 Sun Microsystems, Inc. and Stanford University.
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26 See the LICENSE file for license information. */
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27
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28 // Age table for adaptive feedback-mediated tenuring (scavenging)
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29 //
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30 // Note: all sizes are in oops
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31
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32 class ageTable VALUE_OBJ_CLASS_SPEC {
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33 friend class VMStructs;
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34
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35 public:
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36 // constants
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37 enum { table_size = markOopDesc::max_age + 1 };
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38
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39 // instance variables
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40 size_t sizes[table_size];
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41
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42 // constructor. "global" indicates that this is the global age table
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43 // (as opposed to gc-thread-local)
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44 ageTable(bool global = true);
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45
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46 // clear table
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47 void clear();
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48
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49 // add entry
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50 void add(oop p, size_t oop_size) {
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51 int age = p->age();
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52 assert(age > 0 && age < table_size, "invalid age of object");
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53 sizes[age] += oop_size;
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54 }
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55
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56 // Merge another age table with the current one. Used
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57 // for parallel young generation gc.
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58 void merge(ageTable* subTable);
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59 void merge_par(ageTable* subTable);
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60
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61 // calculate new tenuring threshold based on age information
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62 int compute_tenuring_threshold(size_t survivor_capacity);
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63
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64 private:
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65 PerfVariable* _perf_sizes[table_size];
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66 };
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