1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/gc_implementation/shared/ageTable.hpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,75 @@
1.4 +/*
1.5 + * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_AGETABLE_HPP
1.29 +#define SHARE_VM_GC_IMPLEMENTATION_SHARED_AGETABLE_HPP
1.30 +
1.31 +#include "oops/markOop.hpp"
1.32 +#include "oops/oop.hpp"
1.33 +#include "runtime/perfData.hpp"
1.34 +
1.35 +/* Copyright (c) 1992-2009 Oracle and/or its affiliates, and Stanford University.
1.36 + See the LICENSE file for license information. */
1.37 +
1.38 +// Age table for adaptive feedback-mediated tenuring (scavenging)
1.39 +//
1.40 +// Note: all sizes are in oops
1.41 +
1.42 +class ageTable VALUE_OBJ_CLASS_SPEC {
1.43 + friend class VMStructs;
1.44 +
1.45 + public:
1.46 + // constants
1.47 + enum { table_size = markOopDesc::max_age + 1 };
1.48 +
1.49 + // instance variables
1.50 + size_t sizes[table_size];
1.51 +
1.52 + // constructor. "global" indicates that this is the global age table
1.53 + // (as opposed to gc-thread-local)
1.54 + ageTable(bool global = true);
1.55 +
1.56 + // clear table
1.57 + void clear();
1.58 +
1.59 + // add entry
1.60 + void add(oop p, size_t oop_size) {
1.61 + uint age = p->age();
1.62 + assert(age > 0 && age < table_size, "invalid age of object");
1.63 + sizes[age] += oop_size;
1.64 + }
1.65 +
1.66 + // Merge another age table with the current one. Used
1.67 + // for parallel young generation gc.
1.68 + void merge(ageTable* subTable);
1.69 + void merge_par(ageTable* subTable);
1.70 +
1.71 + // calculate new tenuring threshold based on age information
1.72 + uint compute_tenuring_threshold(size_t survivor_capacity);
1.73 +
1.74 + private:
1.75 + PerfVariable* _perf_sizes[table_size];
1.76 +};
1.77 +
1.78 +#endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_AGETABLE_HPP
