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annotate src/share/vm/gc_implementation/shared/allocationStats.hpp @ 12221:de88570fabfc

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8024256: Minimal VM build is broken with PCH disabled Reviewed-by: coleenp, twisti
author dholmes
date Wed, 11 Sep 2013 00:38:18 -0400
parents db9981fd3124
children 63a4eb8bcd23 78bbf4d43a14
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1 /*
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2 * Copyright (c) 2001, 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_GC_IMPLEMENTATION_SHARED_ALLOCATIONSTATS_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_ALLOCATIONSTATS_HPP
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27
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28 #include "utilities/macros.hpp"
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29 #include "memory/allocation.hpp"
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30 #include "utilities/globalDefinitions.hpp"
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31 #include "gc_implementation/shared/gcUtil.hpp"
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32
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33 class AllocationStats VALUE_OBJ_CLASS_SPEC {
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34 // A duration threshold (in ms) used to filter
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35 // possibly unreliable samples.
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36 static float _threshold;
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37
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38 // We measure the demand between the end of the previous sweep and
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39 // beginning of this sweep:
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40 // Count(end_last_sweep) - Count(start_this_sweep)
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41 // + split_births(between) - split_deaths(between)
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42 // The above number divided by the time since the end of the
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43 // previous sweep gives us a time rate of demand for blocks
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44 // of this size. We compute a padded average of this rate as
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45 // our current estimate for the time rate of demand for blocks
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46 // of this size. Similarly, we keep a padded average for the time
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47 // between sweeps. Our current estimate for demand for blocks of
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48 // this size is then simply computed as the product of these two
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49 // estimates.
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50 AdaptivePaddedAverage _demand_rate_estimate;
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51
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52 ssize_t _desired; // Demand stimate computed as described above
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53 ssize_t _coal_desired; // desired +/- small-percent for tuning coalescing
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54
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55 ssize_t _surplus; // count - (desired +/- small-percent),
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56 // used to tune splitting in best fit
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57 ssize_t _bfr_surp; // surplus at start of current sweep
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58 ssize_t _prev_sweep; // count from end of previous sweep
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59 ssize_t _before_sweep; // count from before current sweep
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60 ssize_t _coal_births; // additional chunks from coalescing
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61 ssize_t _coal_deaths; // loss from coalescing
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62 ssize_t _split_births; // additional chunks from splitting
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63 ssize_t _split_deaths; // loss from splitting
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64 size_t _returned_bytes; // number of bytes returned to list.
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65 public:
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66 void initialize(bool split_birth = false) {
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67 AdaptivePaddedAverage* dummy =
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68 new (&_demand_rate_estimate) AdaptivePaddedAverage(CMS_FLSWeight,
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69 CMS_FLSPadding);
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70 _desired = 0;
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71 _coal_desired = 0;
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72 _surplus = 0;
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73 _bfr_surp = 0;
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74 _prev_sweep = 0;
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75 _before_sweep = 0;
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76 _coal_births = 0;
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77 _coal_deaths = 0;
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78 _split_births = (split_birth ? 1 : 0);
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79 _split_deaths = 0;
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80 _returned_bytes = 0;
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81 }
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82
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83 AllocationStats() {
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84 initialize();
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85 }
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86
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87 // The rate estimate is in blocks per second.
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88 void compute_desired(size_t count,
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89 float inter_sweep_current,
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90 float inter_sweep_estimate,
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91 float intra_sweep_estimate) {
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92 // If the latest inter-sweep time is below our granularity
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93 // of measurement, we may call in here with
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94 // inter_sweep_current == 0. However, even for suitably small
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95 // but non-zero inter-sweep durations, we may not trust the accuracy
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96 // of accumulated data, since it has not been "integrated"
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97 // (read "low-pass-filtered") long enough, and would be
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98 // vulnerable to noisy glitches. In such cases, we
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99 // ignore the current sample and use currently available
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100 // historical estimates.
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101 assert(prev_sweep() + split_births() + coal_births() // "Total Production Stock"
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102 >= split_deaths() + coal_deaths() + (ssize_t)count, // "Current stock + depletion"
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103 "Conservation Principle");
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104 if (inter_sweep_current > _threshold) {
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105 ssize_t demand = prev_sweep() - (ssize_t)count + split_births() + coal_births()
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106 - split_deaths() - coal_deaths();
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107 assert(demand >= 0,
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108 err_msg("Demand (" SSIZE_FORMAT ") should be non-negative for "
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109 PTR_FORMAT " (size=" SIZE_FORMAT ")",
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110 demand, this, count));
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111 // Defensive: adjust for imprecision in event counting
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112 if (demand < 0) {
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113 demand = 0;
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114 }
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115 float old_rate = _demand_rate_estimate.padded_average();
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116 float rate = ((float)demand)/inter_sweep_current;
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117 _demand_rate_estimate.sample(rate);
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118 float new_rate = _demand_rate_estimate.padded_average();
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119 ssize_t old_desired = _desired;
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120 float delta_ise = (CMSExtrapolateSweep ? intra_sweep_estimate : 0.0);
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121 _desired = (ssize_t)(new_rate * (inter_sweep_estimate + delta_ise));
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122 if (PrintFLSStatistics > 1) {
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123 gclog_or_tty->print_cr("demand: %d, old_rate: %f, current_rate: %f, new_rate: %f, old_desired: %d, new_desired: %d",
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124 demand, old_rate, rate, new_rate, old_desired, _desired);
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125 }
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126 }
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127 }
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128
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129 ssize_t desired() const { return _desired; }
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130 void set_desired(ssize_t v) { _desired = v; }
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131
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132 ssize_t coal_desired() const { return _coal_desired; }
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133 void set_coal_desired(ssize_t v) { _coal_desired = v; }
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134
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135 ssize_t surplus() const { return _surplus; }
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136 void set_surplus(ssize_t v) { _surplus = v; }
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137 void increment_surplus() { _surplus++; }
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138 void decrement_surplus() { _surplus--; }
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139
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140 ssize_t bfr_surp() const { return _bfr_surp; }
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141 void set_bfr_surp(ssize_t v) { _bfr_surp = v; }
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142 ssize_t prev_sweep() const { return _prev_sweep; }
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143 void set_prev_sweep(ssize_t v) { _prev_sweep = v; }
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144 ssize_t before_sweep() const { return _before_sweep; }
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145 void set_before_sweep(ssize_t v) { _before_sweep = v; }
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146
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147 ssize_t coal_births() const { return _coal_births; }
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148 void set_coal_births(ssize_t v) { _coal_births = v; }
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149 void increment_coal_births() { _coal_births++; }
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150
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151 ssize_t coal_deaths() const { return _coal_deaths; }
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152 void set_coal_deaths(ssize_t v) { _coal_deaths = v; }
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153 void increment_coal_deaths() { _coal_deaths++; }
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154
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155 ssize_t split_births() const { return _split_births; }
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156 void set_split_births(ssize_t v) { _split_births = v; }
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157 void increment_split_births() { _split_births++; }
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158
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159 ssize_t split_deaths() const { return _split_deaths; }
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160 void set_split_deaths(ssize_t v) { _split_deaths = v; }
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161 void increment_split_deaths() { _split_deaths++; }
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162
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163 NOT_PRODUCT(
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164 size_t returned_bytes() const { return _returned_bytes; }
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165 void set_returned_bytes(size_t v) { _returned_bytes = v; }
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166 )
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167 };
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168
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169 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_ALLOCATIONSTATS_HPP