Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1ErgoVerbose.hpp @ 3914:20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
Summary: It introduces ergonomic decision logging in G1 for the following heuristics: heap sizing, collection set construction, concurrent cycle initiation, and partially-young GC start/end. The code has a bit of refactoring in a few places to make the decision logging possible. It also replaces alternative ad-hoc logging that we have under different parameters and switches (G1_DEBUG, G1PolicyVerbose).
Reviewed-by: johnc, ysr
author | tonyp |
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date | Wed, 07 Sep 2011 12:21:23 -0400 |
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children | f1b4e0e0bdad |
rev | line source |
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1 /* |
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2 * Copyright (c) 2011, 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_G1_G1ERGOVERBOSE_HPP |
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26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1ERGOVERBOSE_HPP |
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27 |
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28 #include "memory/allocation.hpp" |
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29 #include "utilities/debug.hpp" |
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30 |
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31 // The log of G1's heuristic decisions comprises of a series of |
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32 // records which have a similar format in order to maintain |
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33 // consistency across records and ultimately easier parsing of the |
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34 // output, if we ever choose to do that. Each record consists of: |
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35 // * A time stamp to be able to easily correlate each record with |
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36 // other events. |
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37 // * A unique string to allow us to easily identify such records. |
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38 // * The name of the heuristic the record corresponds to. |
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39 // * An action string which describes the action that G1 did or is |
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40 // about to do. |
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41 // * An optional reason string which describes the reason for the |
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42 // action. |
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43 // * An optional number of name/value pairs which contributed to the |
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44 // decision to take the action described in the record. |
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45 // |
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46 // Each record is associated with a "tag" which is the combination of |
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47 // the heuristic the record corresponds to, as well as the min level |
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48 // of verboseness at which the record should be printed. The tag is |
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49 // checked against the current settings to determine whether the record |
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50 // should be printed or not. |
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51 |
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52 // The available verboseness levels. |
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53 typedef enum { |
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54 // Determine which part of the tag is occupied by the level. |
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55 ErgoLevelShift = 8, |
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56 ErgoLevelMask = ~((1 << ErgoLevelShift) - 1), |
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57 |
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58 // ErgoLow is 0 so that we don't have to explicitly or a heuristic |
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59 // id with ErgoLow to keep its use simpler. |
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60 ErgoLow = 0, |
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61 ErgoHigh = 1 << ErgoLevelShift, |
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62 } ErgoLevel; |
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63 |
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64 // The available heuristics. |
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65 typedef enum { |
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66 // Determines which part of the tag is occupied by the heuristic id. |
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67 ErgoHeuristicMask = ~ErgoLevelMask, |
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68 |
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69 ErgoHeapSizing = 0, |
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70 ErgoCSetConstruction, |
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71 ErgoConcCycles, |
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72 ErgoPartiallyYoungGCs, |
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73 |
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74 ErgoHeuristicNum |
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75 } ErgoHeuristic; |
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76 |
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77 class G1ErgoVerbose : AllStatic { |
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78 private: |
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79 // Determines the minimum verboseness level at which records will be |
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80 // printed. |
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81 static ErgoLevel _level; |
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82 // Determines which heuristics are currently enabled. |
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83 static bool _enabled[ErgoHeuristicNum]; |
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84 |
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85 static ErgoLevel extract_level(int tag) { |
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86 return (ErgoLevel) (tag & ErgoLevelMask); |
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87 } |
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88 |
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89 static ErgoHeuristic extract_heuristic(int tag) { |
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90 return (ErgoHeuristic) (tag & ErgoHeuristicMask); |
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91 } |
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92 |
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93 public: |
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94 // Needs to be explicitly called at GC initialization. |
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95 static void initialize(); |
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96 |
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97 static void set_level(ErgoLevel level); |
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98 static void set_enabled(ErgoHeuristic h, bool enabled); |
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99 // It is applied to all heuristics. |
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100 static void set_enabled(bool enabled); |
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101 |
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102 static bool enabled(int tag) { |
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103 ErgoLevel level = extract_level(tag); |
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104 ErgoHeuristic n = extract_heuristic(tag); |
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105 return level <= _level && _enabled[n]; |
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106 } |
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107 |
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108 // Extract the heuristic id from the tag and return a string with |
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109 // its name. |
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110 static const char* to_string(int tag); |
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111 }; |
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112 |
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113 // The macros below generate the format string for values of different |
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114 // types and/or metrics. |
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115 |
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116 // The reason for the action is optional and is handled specially: the |
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117 // reason string is concatenated here so it's not necessary to pass it |
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118 // as a parameter. |
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119 #define ergo_format_reason(_reason_) ", reason: " _reason_ |
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120 |
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121 // Single parameter format strings |
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122 #define ergo_format_str(_name_) ", " _name_ ": %s" |
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123 #define ergo_format_region(_name_) ", " _name_ ": "SIZE_FORMAT" regions" |
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124 #define ergo_format_byte(_name_) ", " _name_ ": "SIZE_FORMAT" bytes" |
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125 #define ergo_format_double(_name_) ", " _name_ ": %1.2f" |
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126 #define ergo_format_perc(_name_) ", " _name_ ": %1.2f %%" |
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127 #define ergo_format_ms(_name_) ", " _name_ ": %1.2f ms" |
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128 |
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129 // Double parameter format strings |
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130 #define ergo_format_byte_perc(_name_) \ |
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131 ", " _name_ ": "SIZE_FORMAT" bytes (%1.2f %%)" |
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132 |
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133 // Generates the format string |
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134 #define ergo_format(_action_, _extra_format_) \ |
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135 " %1.3f: [G1Ergonomics (%s) " _action_ _extra_format_ "]" |
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136 |
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137 // Conditionally, prints an ergonomic decision record. _extra_format_ |
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138 // is the format string for the optional items we'd like to print |
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139 // (i.e., the decision's reason and any associated values). This |
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140 // string should be built up using the ergo_*_format macros (see |
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141 // above) to ensure consistency. |
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142 // |
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143 // Since we cannot rely on the compiler supporting variable argument |
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144 // macros, this macro accepts a fixed number of arguments and passes |
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145 // them to the print method. For convenience, we have wrapper macros |
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146 // below which take a specific number of arguments and set the rest to |
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147 // a default value. |
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148 #define ergo_verbose_common(_tag_, _action_, _extra_format_, \ |
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149 _arg0_, _arg1_, _arg2_, _arg3_, _arg4_, _arg5_) \ |
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150 do { \ |
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151 if (G1ErgoVerbose::enabled((_tag_))) { \ |
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152 gclog_or_tty->print_cr(ergo_format(_action_, _extra_format_), \ |
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153 os::elapsedTime(), \ |
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154 G1ErgoVerbose::to_string((_tag_)), \ |
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155 (_arg0_), (_arg1_), (_arg2_), \ |
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156 (_arg3_), (_arg4_), (_arg5_)); \ |
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157 } \ |
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158 } while (0) |
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159 |
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160 |
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161 #define ergo_verbose(_tag_, _action_) \ |
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162 ergo_verbose_common(_tag_, _action_, "", 0, 0, 0, 0, 0, 0) |
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163 |
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164 #define ergo_verbose0(_tag_, _action_, _extra_format_) \ |
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165 ergo_verbose_common(_tag_, _action_, _extra_format_, 0, 0, 0, 0, 0, 0) |
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166 |
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167 #define ergo_verbose1(_tag_, _action_, _extra_format_, \ |
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168 _arg0_) \ |
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169 ergo_verbose_common(_tag_, _action_, _extra_format_, \ |
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170 _arg0_, 0, 0, 0, 0, 0) |
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171 |
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172 #define ergo_verbose2(_tag_, _action_, _extra_format_, \ |
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173 _arg0_, _arg1_) \ |
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174 ergo_verbose_common(_tag_, _action_, _extra_format_, \ |
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175 _arg0_, _arg1_, 0, 0, 0, 0) |
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176 |
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177 #define ergo_verbose3(_tag_, _action_, _extra_format_, \ |
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178 _arg0_, _arg1_, _arg2_) \ |
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179 ergo_verbose_common(_tag_, _action_, _extra_format_, \ |
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180 _arg0_, _arg1_, _arg2_, 0, 0, 0) |
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181 |
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182 #define ergo_verbose4(_tag_, _action_, _extra_format_, \ |
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183 _arg0_, _arg1_, _arg2_, _arg3_) \ |
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184 ergo_verbose_common(_tag_, _action_, _extra_format_, \ |
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185 _arg0_, _arg1_, _arg2_, _arg3_, 0, 0) |
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186 |
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187 #define ergo_verbose5(_tag_, _action_, _extra_format_, \ |
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188 _arg0_, _arg1_, _arg2_, _arg3_, _arg4_) \ |
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189 ergo_verbose_common(_tag_, _action_, _extra_format_, \ |
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190 _arg0_, _arg1_, _arg2_, _arg3_, _arg4_, 0) |
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191 |
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192 #define ergo_verbose6(_tag_, _action_, _extra_format_, \ |
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193 _arg0_, _arg1_, _arg2_, _arg3_, _arg4_, _arg5_) \ |
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194 ergo_verbose_common(_tag_, _action_, _extra_format_, \ |
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195 _arg0_, _arg1_, _arg2_, _arg3_, _arg4_, _arg5_) |
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196 |
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197 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1ERGOVERBOSE_HPP |