Thu, 05 Jun 2008 15:57:56 -0700
6711316: Open source the Garbage-First garbage collector
Summary: First mercurial integration of the code for the Garbage-First garbage collector.
Reviewed-by: apetrusenko, iveresov, jmasa, sgoldman, tonyp, ysr
duke@435 | 1 | /* |
duke@435 | 2 | * Copyright 1997-2003 Sun Microsystems, Inc. All Rights Reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@435 | 21 | * have any questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
duke@435 | 25 | /* Copyright 1992 Sun Microsystems, Inc. and Stanford University. |
duke@435 | 26 | See the LICENSE file for license information. */ |
duke@435 | 27 | |
duke@435 | 28 | // Age table for adaptive feedback-mediated tenuring (scavenging) |
duke@435 | 29 | // |
duke@435 | 30 | // Note: all sizes are in oops |
duke@435 | 31 | |
duke@435 | 32 | class ageTable VALUE_OBJ_CLASS_SPEC { |
duke@435 | 33 | friend class VMStructs; |
duke@435 | 34 | |
duke@435 | 35 | public: |
duke@435 | 36 | // constants |
duke@435 | 37 | enum { table_size = markOopDesc::max_age + 1 }; |
duke@435 | 38 | |
duke@435 | 39 | // instance variables |
duke@435 | 40 | size_t sizes[table_size]; |
duke@435 | 41 | |
duke@435 | 42 | // constructor. "global" indicates that this is the global age table |
duke@435 | 43 | // (as opposed to gc-thread-local) |
duke@435 | 44 | ageTable(bool global = true); |
duke@435 | 45 | |
duke@435 | 46 | // clear table |
duke@435 | 47 | void clear(); |
duke@435 | 48 | |
duke@435 | 49 | // add entry |
duke@435 | 50 | void add(oop p, size_t oop_size) { |
duke@435 | 51 | int age = p->age(); |
duke@435 | 52 | assert(age > 0 && age < table_size, "invalid age of object"); |
duke@435 | 53 | sizes[age] += oop_size; |
duke@435 | 54 | } |
duke@435 | 55 | |
duke@435 | 56 | // Merge another age table with the current one. Used |
duke@435 | 57 | // for parallel young generation gc. |
duke@435 | 58 | void merge(ageTable* subTable); |
duke@435 | 59 | |
duke@435 | 60 | // calculate new tenuring threshold based on age information |
duke@435 | 61 | int compute_tenuring_threshold(size_t survivor_capacity); |
duke@435 | 62 | |
duke@435 | 63 | private: |
duke@435 | 64 | PerfVariable* _perf_sizes[table_size]; |
duke@435 | 65 | }; |