src/hotspot/share/gc/shared/ageTable.hpp
author stefank
Thu, 22 Feb 2018 18:36:32 +0100
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permissions -rw-r--r--
8198525: Move _size_policy out of GenCollectorPolicy into GenCollectedHeap Reviewed-by: pliden, sjohanss
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/*
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 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_GC_SHARED_AGETABLE_HPP
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#define SHARE_VM_GC_SHARED_AGETABLE_HPP
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#include "oops/markOop.hpp"
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#include "oops/oop.hpp"
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#include "runtime/perfData.hpp"
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/* Copyright (c) 1992, 2016, Oracle and/or its affiliates, and Stanford University.
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   See the LICENSE file for license information. */
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// Age table for adaptive feedback-mediated tenuring (scavenging)
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//
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// Note: all sizes are in oops
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class AgeTable VALUE_OBJ_CLASS_SPEC {
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  friend class VMStructs;
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 public:
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  // constants
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  enum { table_size = markOopDesc::max_age + 1 };
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  // instance variables
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  size_t sizes[table_size];
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  // constructor.  "global" indicates that this is the global age table
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  // (as opposed to gc-thread-local)
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  AgeTable(bool global = true);
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  // clear table
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  void clear();
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  // add entry
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  inline void add(oop p, size_t oop_size);
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  void add(uint age, size_t oop_size) {
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    assert(age > 0 && age < table_size, "invalid age of object");
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    sizes[age] += oop_size;
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  }
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  // Merge another age table with the current one.  Used
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  // for parallel young generation gc.
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  void merge(AgeTable* subTable);
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  // Calculate new tenuring threshold based on age information.
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  uint compute_tenuring_threshold(size_t desired_survivor_size);
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  void print_age_table(uint tenuring_threshold);
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 private:
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  PerfVariable* _perf_sizes[table_size];
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};
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#endif // SHARE_VM_GC_SHARED_AGETABLE_HPP