1 /* |
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2 * Copyright (c) 2002, 2019, 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_GC_CMS_GSPACECOUNTERS_HPP |
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26 #define SHARE_GC_CMS_GSPACECOUNTERS_HPP |
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27 |
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28 #include "gc/shared/generation.hpp" |
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29 #include "gc/shared/generationCounters.hpp" |
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30 #include "runtime/perfData.hpp" |
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31 #include "utilities/macros.hpp" |
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32 |
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33 // A GSpaceCounter is a holder class for performance counters |
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34 // that track a space; |
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35 |
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36 class GSpaceCounters: public CHeapObj<mtGC> { |
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37 friend class VMStructs; |
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38 |
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39 private: |
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40 PerfVariable* _capacity; |
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41 PerfVariable* _used; |
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42 |
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43 // Constant PerfData types don't need to retain a reference. |
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44 // However, it's a good idea to document them here. |
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45 // PerfConstant* _size; |
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46 |
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47 Generation* _gen; |
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48 char* _name_space; |
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49 |
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50 public: |
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51 |
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52 GSpaceCounters(const char* name, int ordinal, size_t max_size, Generation* g, |
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53 GenerationCounters* gc, bool sampled=true); |
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54 |
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55 ~GSpaceCounters(); |
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56 |
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57 inline void update_capacity() { |
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58 _capacity->set_value(_gen->capacity()); |
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59 } |
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60 |
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61 inline void update_used() { |
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62 _used->set_value(_gen->used_stable()); |
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63 } |
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64 |
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65 // special version of update_used() to allow the used value to be |
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66 // passed as a parameter. This method can can be used in cases were |
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67 // the utilization is already known and/or when the _gen->used() |
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68 // method is known to be expensive and we want to avoid unnecessary |
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69 // calls to it. |
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70 // |
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71 inline void update_used(size_t used) { |
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72 _used->set_value(used); |
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73 } |
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74 |
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75 inline void inc_used(size_t size) { |
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76 _used->inc(size); |
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77 } |
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78 |
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79 debug_only( |
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80 // for security reasons, we do not allow arbitrary reads from |
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81 // the counters as they may live in shared memory. |
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82 jlong used() { |
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83 return _used->get_value(); |
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84 } |
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85 jlong capacity() { |
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86 return _used->get_value(); |
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87 } |
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88 ) |
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89 |
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90 inline void update_all() { |
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91 update_used(); |
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92 update_capacity(); |
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93 } |
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94 |
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95 const char* name_space() const { return _name_space; } |
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96 }; |
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97 |
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98 class GenerationUsedHelper : public PerfLongSampleHelper { |
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99 private: |
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100 Generation* _gen; |
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101 |
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102 public: |
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103 GenerationUsedHelper(Generation* g) : _gen(g) { } |
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104 |
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105 inline jlong take_sample() { |
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106 return _gen->used_stable(); |
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107 } |
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108 }; |
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109 |
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110 #endif // SHARE_GC_CMS_GSPACECOUNTERS_HPP |
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