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annotate src/share/vm/gc_implementation/shared/generationCounters.hpp @ 10374:87c64c0438fb

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6976350: G1: deal with fragmentation while copying objects during GC Summary: Create G1ParGCAllocBufferContainer to contain two buffers instead of previously using one buffer, in order to hold the first priority buffer longer. Thus, when some large objects hits the value of free space left in the first priority buffer it has an alternative to fit in the second priority buffer while the first priority buffer is given more chances to try allocating smaller objects. Overall, it will improve heap space efficiency. Reviewed-by: johnc, jmasa, brutisso Contributed-by: tamao <tao.mao@oracle.com>
author tamao
date Mon, 03 Jun 2013 14:37:13 -0700
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1 /*
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2 * Copyright (c) 2002, 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_GENERATIONCOUNTERS_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_GENERATIONCOUNTERS_HPP
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27
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28 #include "runtime/perfData.hpp"
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29 #include "runtime/virtualspace.hpp"
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30
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31 // A GenerationCounter is a holder class for performance counters
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32 // that track a generation
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33
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34 class GenerationCounters: public CHeapObj<mtGC> {
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35 friend class VMStructs;
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36
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37 private:
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38 void initialize(const char* name, int ordinal, int spaces,
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39 size_t min_capacity, size_t max_capacity,
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40 size_t curr_capacity);
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41
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42 protected:
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43 PerfVariable* _current_size;
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44 VirtualSpace* _virtual_space;
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45
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46 // Constant PerfData types don't need to retain a reference.
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47 // However, it's a good idea to document them here.
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48 // PerfStringConstant* _name;
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49 // PerfConstant* _min_size;
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50 // PerfConstant* _max_size;
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51 // PerfConstant* _spaces;
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52
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53 char* _name_space;
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54
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55 // This constructor is only meant for use with the PSGenerationCounters
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56 // constructor. The need for such an constructor should be eliminated
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57 // when VirtualSpace and PSVirtualSpace are unified.
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58 GenerationCounters()
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59 : _name_space(NULL), _current_size(NULL), _virtual_space(NULL) {}
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60
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61 // This constructor is used for subclasses that do not have a space
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62 // associated with them (e.g, in G1).
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63 GenerationCounters(const char* name, int ordinal, int spaces,
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64 size_t min_capacity, size_t max_capacity,
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65 size_t curr_capacity);
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66
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67 public:
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68 GenerationCounters(const char* name, int ordinal, int spaces,
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69 VirtualSpace* v);
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71 ~GenerationCounters() {
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72 if (_name_space != NULL) FREE_C_HEAP_ARRAY(char, _name_space, mtGC);
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73 }
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75 virtual void update_all();
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77 const char* name_space() const { return _name_space; }
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78
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79 };
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80 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_GENERATIONCOUNTERS_HPP