duke@435: /*
stefank@2314:  * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_AGETABLE_HPP
stefank@2314: #define SHARE_VM_GC_IMPLEMENTATION_SHARED_AGETABLE_HPP
stefank@2314: 
stefank@2314: #include "oops/markOop.hpp"
stefank@2314: #include "oops/oop.hpp"
stefank@2314: #include "runtime/perfData.hpp"
stefank@2314: 
trims@1907: /* Copyright (c) 1992-2009 Oracle and/or its affiliates, and Stanford University.
duke@435:    See the LICENSE file for license information. */
duke@435: 
duke@435: // Age table for adaptive feedback-mediated tenuring (scavenging)
duke@435: //
duke@435: // Note: all sizes are in oops
duke@435: 
duke@435: class ageTable VALUE_OBJ_CLASS_SPEC {
duke@435:   friend class VMStructs;
duke@435: 
duke@435:  public:
duke@435:   // constants
duke@435:   enum { table_size = markOopDesc::max_age + 1 };
duke@435: 
duke@435:   // instance variables
duke@435:   size_t sizes[table_size];
duke@435: 
duke@435:   // constructor.  "global" indicates that this is the global age table
duke@435:   // (as opposed to gc-thread-local)
duke@435:   ageTable(bool global = true);
duke@435: 
duke@435:   // clear table
duke@435:   void clear();
duke@435: 
duke@435:   // add entry
duke@435:   void add(oop p, size_t oop_size) {
jwilhelm@4129:     uint age = p->age();
duke@435:     assert(age > 0 && age < table_size, "invalid age of object");
duke@435:     sizes[age] += oop_size;
duke@435:   }
duke@435: 
duke@435:   // Merge another age table with the current one.  Used
duke@435:   // for parallel young generation gc.
duke@435:   void merge(ageTable* subTable);
apetrusenko@980:   void merge_par(ageTable* subTable);
duke@435: 
duke@435:   // calculate new tenuring threshold based on age information
jwilhelm@4129:   uint compute_tenuring_threshold(size_t survivor_capacity);
duke@435: 
duke@435:  private:
duke@435:   PerfVariable* _perf_sizes[table_size];
duke@435: };
stefank@2314: 
stefank@2314: #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_AGETABLE_HPP