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annotate src/share/vm/runtime/task.cpp @ 10292:acac2b03a07f

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8014765: VM exits if MaxTenuringThreshold is set below the default InitialTenuringThreshold, and InitialTenuringThreshold is not set Summary: The VM exits when the condition in the subject line applies. The fix sets InitialTenuringThreshold to MaxTenuringThreshold if it is larger than MaxTenuringThreshold and InitialTenuringThreshold has not been set (is default). Reviewed-by: jwilhelm, jmasa, brutisso, johnc
author tschatzl
date Thu, 16 May 2013 23:51:51 +0200
parents f34d701e952e
children f2110083203d
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1 /*
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2 * Copyright (c) 1997, 2010, 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 #include "precompiled.hpp"
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26 #include "memory/allocation.hpp"
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27 #include "runtime/init.hpp"
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28 #include "runtime/task.hpp"
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29 #include "runtime/thread.inline.hpp"
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30 #include "runtime/timer.hpp"
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31 #ifdef TARGET_OS_FAMILY_linux
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32 # include "os_linux.inline.hpp"
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33 #endif
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34 #ifdef TARGET_OS_FAMILY_solaris
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35 # include "os_solaris.inline.hpp"
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36 #endif
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37 #ifdef TARGET_OS_FAMILY_windows
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38 # include "os_windows.inline.hpp"
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39 #endif
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40 #ifdef TARGET_OS_FAMILY_bsd
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41 # include "os_bsd.inline.hpp"
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42 #endif
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43
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44 int PeriodicTask::_num_tasks = 0;
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45 PeriodicTask* PeriodicTask::_tasks[PeriodicTask::max_tasks];
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46 #ifndef PRODUCT
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47 elapsedTimer PeriodicTask::_timer;
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48 int PeriodicTask::_intervalHistogram[PeriodicTask::max_interval];
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49 int PeriodicTask::_ticks;
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50
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51 void PeriodicTask::print_intervals() {
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52 if (ProfilerCheckIntervals) {
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53 for (int i = 0; i < PeriodicTask::max_interval; i++) {
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54 int n = _intervalHistogram[i];
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55 if (n > 0) tty->print_cr("%3d: %5d (%4.1f%%)", i, n, 100.0 * n / _ticks);
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56 }
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57 }
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58 }
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59 #endif
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60
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61 void PeriodicTask::real_time_tick(int delay_time) {
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62 #ifndef PRODUCT
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63 if (ProfilerCheckIntervals) {
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64 _ticks++;
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65 _timer.stop();
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66 int ms = (int)(_timer.seconds() * 1000.0);
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67 _timer.reset();
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68 _timer.start();
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69 if (ms >= PeriodicTask::max_interval) ms = PeriodicTask::max_interval - 1;
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70 _intervalHistogram[ms]++;
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71 }
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72 #endif
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73
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74 {
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75 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag);
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76 int orig_num_tasks = _num_tasks;
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77
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78 for(int index = 0; index < _num_tasks; index++) {
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79 _tasks[index]->execute_if_pending(delay_time);
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80 if (_num_tasks < orig_num_tasks) { // task dis-enrolled itself
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81 index--; // re-do current slot as it has changed
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82 orig_num_tasks = _num_tasks;
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83 }
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84 }
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85 }
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86 }
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87
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88 int PeriodicTask::time_to_wait() {
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89 MutexLockerEx ml(PeriodicTask_lock->owned_by_self() ?
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90 NULL : PeriodicTask_lock, Mutex::_no_safepoint_check_flag);
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91
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92 if (_num_tasks == 0) {
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93 return 0; // sleep until shutdown or a task is enrolled
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94 }
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95
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96 int delay = _tasks[0]->time_to_next_interval();
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97 for (int index = 1; index < _num_tasks; index++) {
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98 delay = MIN2(delay, _tasks[index]->time_to_next_interval());
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99 }
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100 return delay;
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101 }
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102
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103
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104 PeriodicTask::PeriodicTask(size_t interval_time) :
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105 _counter(0), _interval((int) interval_time) {
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106 // Sanity check the interval time
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107 assert(_interval >= PeriodicTask::min_interval &&
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108 _interval <= PeriodicTask::max_interval &&
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109 _interval % PeriodicTask::interval_gran == 0,
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110 "improper PeriodicTask interval time");
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111 }
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112
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113 PeriodicTask::~PeriodicTask() {
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114 disenroll();
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115 }
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116
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117 void PeriodicTask::enroll() {
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118 MutexLockerEx ml(PeriodicTask_lock->owned_by_self() ?
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119 NULL : PeriodicTask_lock, Mutex::_no_safepoint_check_flag);
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120
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121 if (_num_tasks == PeriodicTask::max_tasks) {
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122 fatal("Overflow in PeriodicTask table");
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123 }
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124 _tasks[_num_tasks++] = this;
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125
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126 WatcherThread* thread = WatcherThread::watcher_thread();
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127 if (thread) {
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128 thread->unpark();
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129 } else {
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130 WatcherThread::start();
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131 }
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132 }
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133
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134 void PeriodicTask::disenroll() {
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135 MutexLockerEx ml(PeriodicTask_lock->owned_by_self() ?
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136 NULL : PeriodicTask_lock, Mutex::_no_safepoint_check_flag);
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137
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138 int index;
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139 for(index = 0; index < _num_tasks && _tasks[index] != this; index++)
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140 ;
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141
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142 if (index == _num_tasks) {
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143 return;
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144 }
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145
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146 _num_tasks--;
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147
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148 for (; index < _num_tasks; index++) {
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149 _tasks[index] = _tasks[index+1];
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150 }
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151 }