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