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annotate src/share/vm/gc_implementation/g1/g1GCPhaseTimes.cpp @ 6786:5baec2e69518

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7200615: NPG: optimized VM build is broken Reviewed-by: kvn
author jmasa
date Tue, 25 Sep 2012 07:05:55 -0700
parents bb3f6194fedb
children 7df93f7c14a5
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1 /*
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2 * Copyright (c) 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
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26 #include "precompiled.hpp"
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27 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
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28 #include "gc_implementation/g1/g1GCPhaseTimes.hpp"
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29 #include "gc_implementation/g1/g1Log.hpp"
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30
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31 // Helper class for avoiding interleaved logging
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32 class LineBuffer: public StackObj {
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33
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34 private:
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35 static const int BUFFER_LEN = 1024;
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36 static const int INDENT_CHARS = 3;
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37 char _buffer[BUFFER_LEN];
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38 int _indent_level;
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39 int _cur;
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40
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41 void vappend(const char* format, va_list ap) {
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42 int res = vsnprintf(&_buffer[_cur], BUFFER_LEN - _cur, format, ap);
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43 if (res != -1) {
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44 _cur += res;
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45 } else {
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46 DEBUG_ONLY(warning("buffer too small in LineBuffer");)
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47 _buffer[BUFFER_LEN -1] = 0;
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48 _cur = BUFFER_LEN; // vsnprintf above should not add to _buffer if we are called again
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49 }
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50 }
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51
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52 public:
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53 explicit LineBuffer(int indent_level): _indent_level(indent_level), _cur(0) {
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54 for (; (_cur < BUFFER_LEN && _cur < (_indent_level * INDENT_CHARS)); _cur++) {
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55 _buffer[_cur] = ' ';
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56 }
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57 }
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58
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59 #ifndef PRODUCT
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60 ~LineBuffer() {
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61 assert(_cur == _indent_level * INDENT_CHARS, "pending data in buffer - append_and_print_cr() not called?");
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62 }
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63 #endif
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64
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65 void append(const char* format, ...) {
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66 va_list ap;
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67 va_start(ap, format);
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68 vappend(format, ap);
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69 va_end(ap);
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70 }
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71
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72 void append_and_print_cr(const char* format, ...) {
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73 va_list ap;
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74 va_start(ap, format);
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75 vappend(format, ap);
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76 va_end(ap);
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77 gclog_or_tty->print_cr("%s", _buffer);
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78 _cur = _indent_level * INDENT_CHARS;
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79 }
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80 };
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81
6628
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82 template <class T>
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83 void WorkerDataArray<T>::print(int level, const char* title) {
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84 if (_length == 1) {
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85 // No need for min, max, average and sum for only one worker
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86 LineBuffer buf(level);
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87 buf.append("[%s: ", title);
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88 buf.append(_print_format, _data[0]);
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89 buf.append_and_print_cr("]");
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90 return;
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91 }
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92
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93 T min = _data[0];
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94 T max = _data[0];
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95 T sum = 0;
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96
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97 LineBuffer buf(level);
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98 buf.append("[%s:", title);
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99 for (uint i = 0; i < _length; ++i) {
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100 T val = _data[i];
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101 min = MIN2(val, min);
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102 max = MAX2(val, max);
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103 sum += val;
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104 if (G1Log::finest()) {
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105 buf.append(" ");
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106 buf.append(_print_format, val);
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107 }
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108 }
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109
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110 if (G1Log::finest()) {
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111 buf.append_and_print_cr("");
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112 }
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113
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114 double avg = (double)sum / (double)_length;
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115 buf.append(" Min: ");
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116 buf.append(_print_format, min);
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117 buf.append(", Avg: ");
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118 buf.append("%.1lf", avg); // Always print average as a double
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119 buf.append(", Max: ");
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120 buf.append(_print_format, max);
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121 buf.append(", Diff: ");
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122 buf.append(_print_format, max - min);
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123 if (_print_sum) {
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124 // for things like the start and end times the sum is not
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125 // that relevant
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126 buf.append(", Sum: ");
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127 buf.append(_print_format, sum);
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128 }
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129 buf.append_and_print_cr("]");
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130 }
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131
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132 #ifndef PRODUCT
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133
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134 template <class T>
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135 void WorkerDataArray<T>::reset() {
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136 for (uint i = 0; i < _length; i++) {
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137 _data[i] = (T)-1;
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138 }
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139 }
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140
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141 template <class T>
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142 void WorkerDataArray<T>::verify() {
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143 for (uint i = 0; i < _length; i++) {
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144 assert(_data[i] >= (T)0, err_msg("Invalid data for worker %d", i));
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145 }
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146 }
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147
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148 #endif
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149
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150 G1GCPhaseTimes::G1GCPhaseTimes(uint max_gc_threads) :
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151 _max_gc_threads(max_gc_threads),
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152 _min_clear_cc_time_ms(-1.0),
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153 _max_clear_cc_time_ms(-1.0),
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154 _cur_clear_cc_time_ms(0.0),
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155 _cum_clear_cc_time_ms(0.0),
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156 _num_cc_clears(0L),
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157 _last_gc_worker_start_times_ms(_max_gc_threads, "%.1lf", false),
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158 _last_ext_root_scan_times_ms(_max_gc_threads, "%.1lf"),
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159 _last_satb_filtering_times_ms(_max_gc_threads, "%.1lf"),
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160 _last_update_rs_times_ms(_max_gc_threads, "%.1lf"),
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161 _last_update_rs_processed_buffers(_max_gc_threads, "%d"),
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162 _last_scan_rs_times_ms(_max_gc_threads, "%.1lf"),
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163 _last_obj_copy_times_ms(_max_gc_threads, "%.1lf"),
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164 _last_termination_times_ms(_max_gc_threads, "%.1lf"),
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165 _last_termination_attempts(_max_gc_threads, SIZE_FORMAT),
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166 _last_gc_worker_end_times_ms(_max_gc_threads, "%.1lf", false),
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167 _last_gc_worker_times_ms(_max_gc_threads, "%.1lf"),
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168 _last_gc_worker_other_times_ms(_max_gc_threads, "%.1lf")
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169 {
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170 assert(max_gc_threads > 0, "Must have some GC threads");
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171 }
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172
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173 void G1GCPhaseTimes::note_gc_start(uint active_gc_threads) {
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174 assert(active_gc_threads > 0, "The number of threads must be > 0");
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175 assert(active_gc_threads <= _max_gc_threads, "The number of active threads must be <= the max nubmer of threads");
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176 _active_gc_threads = active_gc_threads;
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177
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178 _last_gc_worker_start_times_ms.reset();
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179 _last_ext_root_scan_times_ms.reset();
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180 _last_satb_filtering_times_ms.reset();
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181 _last_update_rs_times_ms.reset();
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182 _last_update_rs_processed_buffers.reset();
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183 _last_scan_rs_times_ms.reset();
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184 _last_obj_copy_times_ms.reset();
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185 _last_termination_times_ms.reset();
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186 _last_termination_attempts.reset();
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187 _last_gc_worker_end_times_ms.reset();
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188 _last_gc_worker_times_ms.reset();
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189 _last_gc_worker_other_times_ms.reset();
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190 }
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191
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192 void G1GCPhaseTimes::note_gc_end() {
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193 _last_gc_worker_start_times_ms.verify();
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194 _last_ext_root_scan_times_ms.verify();
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195 _last_satb_filtering_times_ms.verify();
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196 _last_update_rs_times_ms.verify();
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197 _last_update_rs_processed_buffers.verify();
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198 _last_scan_rs_times_ms.verify();
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199 _last_obj_copy_times_ms.verify();
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200 _last_termination_times_ms.verify();
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201 _last_termination_attempts.verify();
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202 _last_gc_worker_end_times_ms.verify();
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203
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204 for (uint i = 0; i < _active_gc_threads; i++) {
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205 double worker_time = _last_gc_worker_end_times_ms.get(i) - _last_gc_worker_start_times_ms.get(i);
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206 _last_gc_worker_times_ms.set(i, worker_time);
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207
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208 double worker_known_time = _last_ext_root_scan_times_ms.get(i) +
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209 _last_satb_filtering_times_ms.get(i) +
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210 _last_update_rs_times_ms.get(i) +
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211 _last_scan_rs_times_ms.get(i) +
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212 _last_obj_copy_times_ms.get(i) +
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213 _last_termination_times_ms.get(i);
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214
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215 double worker_other_time = worker_time - worker_known_time;
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216 _last_gc_worker_other_times_ms.set(i, worker_other_time);
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217 }
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218
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219 _last_gc_worker_times_ms.verify();
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220 _last_gc_worker_other_times_ms.verify();
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221 }
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222
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223 void G1GCPhaseTimes::print_stats(int level, const char* str, double value) {
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224 LineBuffer(level).append_and_print_cr("[%s: %.1lf ms]", str, value);
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225 }
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226
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227 void G1GCPhaseTimes::print_stats(int level, const char* str, double value, int workers) {
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228 LineBuffer(level).append_and_print_cr("[%s: %.1lf ms, GC Workers: %d]", str, value, workers);
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229 }
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230
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231 double G1GCPhaseTimes::accounted_time_ms() {
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232 // Subtract the root region scanning wait time. It's initialized to
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233 // zero at the start of the pause.
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234 double misc_time_ms = _root_region_scan_wait_time_ms;
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235
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236 misc_time_ms += _cur_collection_par_time_ms;
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237
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238 // Now subtract the time taken to fix up roots in generated code
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239 misc_time_ms += _cur_collection_code_root_fixup_time_ms;
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240
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241 // Subtract the time taken to clean the card table from the
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242 // current value of "other time"
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243 misc_time_ms += _cur_clear_ct_time_ms;
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244
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245 return misc_time_ms;
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246 }
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247
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248 void G1GCPhaseTimes::print(double pause_time_sec) {
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249 if (_root_region_scan_wait_time_ms > 0.0) {
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250 print_stats(1, "Root Region Scan Waiting", _root_region_scan_wait_time_ms);
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251 }
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252 if (G1CollectedHeap::use_parallel_gc_threads()) {
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253 print_stats(1, "Parallel Time", _cur_collection_par_time_ms, _active_gc_threads);
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254 _last_gc_worker_start_times_ms.print(2, "GC Worker Start (ms)");
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255 _last_ext_root_scan_times_ms.print(2, "Ext Root Scanning (ms)");
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256 if (_last_satb_filtering_times_ms.sum() > 0.0) {
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257 _last_satb_filtering_times_ms.print(2, "SATB Filtering (ms)");
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258 }
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259 _last_update_rs_times_ms.print(2, "Update RS (ms)");
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260 _last_update_rs_processed_buffers.print(3, "Processed Buffers");
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261 _last_scan_rs_times_ms.print(2, "Scan RS (ms)");
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262 _last_obj_copy_times_ms.print(2, "Object Copy (ms)");
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263 _last_termination_times_ms.print(2, "Termination (ms)");
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264 if (G1Log::finest()) {
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265 _last_termination_attempts.print(3, "Termination Attempts");
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266 }
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267 _last_gc_worker_other_times_ms.print(2, "GC Worker Other (ms)");
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268 _last_gc_worker_times_ms.print(2, "GC Worker Total (ms)");
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269 _last_gc_worker_end_times_ms.print(2, "GC Worker End (ms)");
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270 } else {
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271 _last_ext_root_scan_times_ms.print(1, "Ext Root Scanning (ms)");
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272 if (_last_satb_filtering_times_ms.sum() > 0.0) {
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273 _last_satb_filtering_times_ms.print(1, "SATB Filtering (ms)");
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274 }
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275 _last_update_rs_times_ms.print(1, "Update RS (ms)");
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276 _last_update_rs_processed_buffers.print(2, "Processed Buffers");
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277 _last_scan_rs_times_ms.print(1, "Scan RS (ms)");
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278 _last_obj_copy_times_ms.print(1, "Object Copy (ms)");
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279 }
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280 print_stats(1, "Code Root Fixup", _cur_collection_code_root_fixup_time_ms);
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281 print_stats(1, "Clear CT", _cur_clear_ct_time_ms);
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282 if (Verbose && G1Log::finest()) {
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283 print_stats(1, "Cur Clear CC", _cur_clear_cc_time_ms);
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284 print_stats(1, "Cum Clear CC", _cum_clear_cc_time_ms);
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285 print_stats(1, "Min Clear CC", _min_clear_cc_time_ms);
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286 print_stats(1, "Max Clear CC", _max_clear_cc_time_ms);
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287 if (_num_cc_clears > 0) {
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288 print_stats(1, "Avg Clear CC", _cum_clear_cc_time_ms / ((double)_num_cc_clears));
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289 }
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290 }
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291 double misc_time_ms = pause_time_sec * MILLIUNITS - accounted_time_ms();
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292 print_stats(1, "Other", misc_time_ms);
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293 if (_cur_verify_before_time_ms > 0.0) {
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294 print_stats(2, "Verify Before", _cur_verify_before_time_ms);
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295 }
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296 print_stats(2, "Choose CSet",
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297 (_recorded_young_cset_choice_time_ms +
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298 _recorded_non_young_cset_choice_time_ms));
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299 print_stats(2, "Ref Proc", _cur_ref_proc_time_ms);
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300 print_stats(2, "Ref Enq", _cur_ref_enq_time_ms);
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301 print_stats(2, "Free CSet",
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302 (_recorded_young_free_cset_time_ms +
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303 _recorded_non_young_free_cset_time_ms));
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304 if (_cur_verify_after_time_ms > 0.0) {
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305 print_stats(2, "Verify After", _cur_verify_after_time_ms);
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306 }
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307 }
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308
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309 void G1GCPhaseTimes::record_cc_clear_time_ms(double ms) {
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310 if (!(Verbose && G1Log::finest())) {
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311 return;
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312 }
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313
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314 if (_min_clear_cc_time_ms < 0.0 || ms <= _min_clear_cc_time_ms) {
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315 _min_clear_cc_time_ms = ms;
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316 }
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317 if (_max_clear_cc_time_ms < 0.0 || ms >= _max_clear_cc_time_ms) {
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318 _max_clear_cc_time_ms = ms;
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319 }
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320 _cur_clear_cc_time_ms = ms;
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321 _cum_clear_cc_time_ms += ms;
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322 _num_cc_clears++;
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323 }