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annotate src/share/vm/oops/methodCounters.hpp @ 10105:aeaca88565e6

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8010862: The Method counter fields used for profiling can be allocated lazily. Summary: Allocate the method's profiling related metadata until they are needed. Reviewed-by: coleenp, roland
author jiangli
date Tue, 09 Apr 2013 17:17:41 -0400
parents
children 836a62f43af9 631667807de7
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10105
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1 /*
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2 * Copyright (c) 2013, 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_OOPS_METHODCOUNTERS_HPP
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26 #define SHARE_VM_OOPS_METHODCOUNTERS_HPP
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27
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28 #include "oops/metadata.hpp"
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29 #include "interpreter/invocationCounter.hpp"
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30
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31 class MethodCounters: public MetaspaceObj {
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32 friend class VMStructs;
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33 private:
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34 int _interpreter_invocation_count; // Count of times invoked (reused as prev_event_count in tiered)
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35 u2 _interpreter_throwout_count; // Count of times method was exited via exception while interpreting
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36 u2 _number_of_breakpoints; // fullspeed debugging support
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37 InvocationCounter _invocation_counter; // Incremented before each activation of the method - used to trigger frequency-based optimizations
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38 InvocationCounter _backedge_counter; // Incremented before each backedge taken - used to trigger frequencey-based optimizations
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39
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40 #ifdef TIERED
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41 float _rate; // Events (invocation and backedge counter increments) per millisecond
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42 jlong _prev_time; // Previous time the rate was acquired
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43 #endif
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44
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45 MethodCounters() : _interpreter_invocation_count(0),
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46 _interpreter_throwout_count(0),
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47 _number_of_breakpoints(0)
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48 #ifdef TIERED
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49 , _rate(0),
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50 _prev_time(0)
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51 #endif
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52 {
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53 invocation_counter()->init();
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54 backedge_counter()->init();
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55 }
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56
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57 public:
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58 static MethodCounters* allocate(ClassLoaderData* loader_data, TRAPS);
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59
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60 void deallocate_contents(ClassLoaderData* loader_data) {}
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61 DEBUG_ONLY(bool on_stack() { return false; }) // for template
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62
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63 static int size() { return sizeof(MethodCounters) / wordSize; }
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64
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65 bool is_klass() const { return false; }
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66
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67 void clear_counters();
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68
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69 int interpreter_invocation_count() {
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70 return _interpreter_invocation_count;
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71 }
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72 void set_interpreter_invocation_count(int count) {
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73 _interpreter_invocation_count = count;
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74 }
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75 int increment_interpreter_invocation_count() {
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76 return ++_interpreter_invocation_count;
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77 }
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78
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79 void interpreter_throwout_increment() {
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80 if (_interpreter_throwout_count < 65534) {
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81 _interpreter_throwout_count++;
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82 }
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83 }
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84 int interpreter_throwout_count() const {
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85 return _interpreter_throwout_count;
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86 }
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87 void set_interpreter_throwout_count(int count) {
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88 _interpreter_throwout_count = count;
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89 }
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90
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91 u2 number_of_breakpoints() const { return _number_of_breakpoints; }
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92 void incr_number_of_breakpoints() { ++_number_of_breakpoints; }
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93 void decr_number_of_breakpoints() { --_number_of_breakpoints; }
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94 void clear_number_of_breakpoints() { _number_of_breakpoints = 0; }
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95
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96 #ifdef TIERED
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97 jlong prev_time() const { return _prev_time; }
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98 void set_prev_time(jlong time) { _prev_time = time; }
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99 float rate() const { return _rate; }
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100 void set_rate(float rate) { _rate = rate; }
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101 #endif
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102
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103 // invocation counter
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104 InvocationCounter* invocation_counter() { return &_invocation_counter; }
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105 InvocationCounter* backedge_counter() { return &_backedge_counter; }
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106
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107 static ByteSize interpreter_invocation_counter_offset() {
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108 return byte_offset_of(MethodCounters, _interpreter_invocation_count);
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109 }
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110
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111 static ByteSize invocation_counter_offset() {
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112 return byte_offset_of(MethodCounters, _invocation_counter);
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113 }
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114
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115 static ByteSize backedge_counter_offset() {
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116 return byte_offset_of(MethodCounters, _backedge_counter);
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117 }
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118
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119 static int interpreter_invocation_counter_offset_in_bytes() {
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120 return offset_of(MethodCounters, _interpreter_invocation_count);
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121 }
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122
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123 };
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124 #endif //SHARE_VM_OOPS_METHODCOUNTERS_HPP