Tue, 08 Aug 2017 15:57:29 +0800
merge
aoqi@0 | 1 | /* |
aoqi@0 | 2 | * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
aoqi@0 | 4 | * |
aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
aoqi@0 | 7 | * published by the Free Software Foundation. |
aoqi@0 | 8 | * |
aoqi@0 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
aoqi@0 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
aoqi@0 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
aoqi@0 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
aoqi@0 | 13 | * accompanied this code). |
aoqi@0 | 14 | * |
aoqi@0 | 15 | * You should have received a copy of the GNU General Public License version |
aoqi@0 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
aoqi@0 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
aoqi@0 | 18 | * |
aoqi@0 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
aoqi@0 | 20 | * or visit www.oracle.com if you need additional information or have any |
aoqi@0 | 21 | * questions. |
aoqi@0 | 22 | * |
aoqi@0 | 23 | */ |
aoqi@0 | 24 | |
aoqi@0 | 25 | #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_AGETABLE_HPP |
aoqi@0 | 26 | #define SHARE_VM_GC_IMPLEMENTATION_SHARED_AGETABLE_HPP |
aoqi@0 | 27 | |
aoqi@0 | 28 | #include "oops/markOop.hpp" |
aoqi@0 | 29 | #include "oops/oop.hpp" |
aoqi@0 | 30 | #include "runtime/perfData.hpp" |
aoqi@0 | 31 | |
aoqi@0 | 32 | /* Copyright (c) 1992-2009 Oracle and/or its affiliates, and Stanford University. |
aoqi@0 | 33 | See the LICENSE file for license information. */ |
aoqi@0 | 34 | |
aoqi@0 | 35 | // Age table for adaptive feedback-mediated tenuring (scavenging) |
aoqi@0 | 36 | // |
aoqi@0 | 37 | // Note: all sizes are in oops |
aoqi@0 | 38 | |
aoqi@0 | 39 | class ageTable VALUE_OBJ_CLASS_SPEC { |
aoqi@0 | 40 | friend class VMStructs; |
aoqi@0 | 41 | |
aoqi@0 | 42 | public: |
aoqi@0 | 43 | // constants |
aoqi@0 | 44 | enum { table_size = markOopDesc::max_age + 1 }; |
aoqi@0 | 45 | |
aoqi@0 | 46 | // instance variables |
aoqi@0 | 47 | size_t sizes[table_size]; |
aoqi@0 | 48 | |
aoqi@0 | 49 | // constructor. "global" indicates that this is the global age table |
aoqi@0 | 50 | // (as opposed to gc-thread-local) |
aoqi@0 | 51 | ageTable(bool global = true); |
aoqi@0 | 52 | |
aoqi@0 | 53 | // clear table |
aoqi@0 | 54 | void clear(); |
aoqi@0 | 55 | |
aoqi@0 | 56 | // add entry |
aoqi@0 | 57 | void add(oop p, size_t oop_size) { |
aoqi@0 | 58 | uint age = p->age(); |
aoqi@0 | 59 | assert(age > 0 && age < table_size, "invalid age of object"); |
aoqi@0 | 60 | sizes[age] += oop_size; |
aoqi@0 | 61 | } |
aoqi@0 | 62 | |
aoqi@0 | 63 | // Merge another age table with the current one. Used |
aoqi@0 | 64 | // for parallel young generation gc. |
aoqi@0 | 65 | void merge(ageTable* subTable); |
aoqi@0 | 66 | void merge_par(ageTable* subTable); |
aoqi@0 | 67 | |
aoqi@0 | 68 | // calculate new tenuring threshold based on age information |
aoqi@0 | 69 | uint compute_tenuring_threshold(size_t survivor_capacity); |
aoqi@0 | 70 | |
aoqi@0 | 71 | private: |
aoqi@0 | 72 | PerfVariable* _perf_sizes[table_size]; |
aoqi@0 | 73 | }; |
aoqi@0 | 74 | |
aoqi@0 | 75 | #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_AGETABLE_HPP |