Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: src/share/vm/gc_implementation/shared/ageTable.hpp
src/share/vm/gc_implementation/shared/ageTable.hpp
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| 1 /* | |
| 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 20 * or visit www.oracle.com if you need additional information or have any | |
| 21 * questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_AGETABLE_HPP | |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_AGETABLE_HPP | |
| 27 | |
| 28 #include "oops/markOop.hpp" | |
| 29 #include "oops/oop.hpp" | |
| 30 #include "runtime/perfData.hpp" | |
| 31 | |
| 32 /* Copyright (c) 1992-2009 Oracle and/or its affiliates, and Stanford University. | |
| 33 See the LICENSE file for license information. */ | |
| 34 | |
| 35 // Age table for adaptive feedback-mediated tenuring (scavenging) | |
| 36 // | |
| 37 // Note: all sizes are in oops | |
| 38 | |
| 39 class ageTable VALUE_OBJ_CLASS_SPEC { | |
| 40 friend class VMStructs; | |
| 41 | |
| 42 public: | |
| 43 // constants | |
| 44 enum { table_size = markOopDesc::max_age + 1 }; | |
| 45 | |
| 46 // instance variables | |
| 47 size_t sizes[table_size]; | |
| 48 | |
| 49 // constructor. "global" indicates that this is the global age table | |
| 50 // (as opposed to gc-thread-local) | |
| 51 ageTable(bool global = true); | |
| 52 | |
| 53 // clear table | |
| 54 void clear(); | |
| 55 | |
| 56 // add entry | |
| 57 void add(oop p, size_t oop_size) { | |
| 58 uint age = p->age(); | |
| 59 assert(age > 0 && age < table_size, "invalid age of object"); | |
| 60 sizes[age] += oop_size; | |
| 61 } | |
| 62 | |
| 63 // Merge another age table with the current one. Used | |
| 64 // for parallel young generation gc. | |
| 65 void merge(ageTable* subTable); | |
| 66 void merge_par(ageTable* subTable); | |
| 67 | |
| 68 // calculate new tenuring threshold based on age information | |
| 69 uint compute_tenuring_threshold(size_t survivor_capacity); | |
| 70 | |
| 71 private: | |
| 72 PerfVariable* _perf_sizes[table_size]; | |
| 73 }; | |
| 74 | |
| 75 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_AGETABLE_HPP |
