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annotate src/share/vm/runtime/task.cpp @ 10405:f2110083203d

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8005849: JEP 167: Event-Based JVM Tracing Reviewed-by: acorn, coleenp, sla Contributed-by: Karen Kinnear <karen.kinnear@oracle.com>, Bengt Rutisson <bengt.rutisson@oracle.com>, Calvin Cheung <calvin.cheung@oracle.com>, Erik Gahlin <erik.gahlin@oracle.com>, Erik Helin <erik.helin@oracle.com>, Jesper Wilhelmsson <jesper.wilhelmsson@oracle.com>, Keith McGuigan <keith.mcguigan@oracle.com>, Mattias Tobiasson <mattias.tobiasson@oracle.com>, Markus Gronlund <markus.gronlund@oracle.com>, Mikael Auno <mikael.auno@oracle.com>, Nils Eliasson <nils.eliasson@oracle.com>, Nils Loodin <nils.loodin@oracle.com>, Rickard Backman <rickard.backman@oracle.com>, Staffan Larsen <staffan.larsen@oracle.com>, Stefan Karlsson <stefan.karlsson@oracle.com>, Yekaterina Kantserova <yekaterina.kantserova@oracle.com>
author sla
date Mon, 10 Jun 2013 11:30:51 +0200
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children 606acabe7b5c
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1 /*
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2 * Copyright (c) 1997, 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 #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 /* enroll could be called from a JavaThread, so we have to check for
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118 * safepoint when taking the lock to avoid deadlocking */
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119 void PeriodicTask::enroll() {
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120 MutexLockerEx ml(PeriodicTask_lock->owned_by_self() ?
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121 NULL : PeriodicTask_lock);
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122
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123 if (_num_tasks == PeriodicTask::max_tasks) {
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124 fatal("Overflow in PeriodicTask table");
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125 }
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126 _tasks[_num_tasks++] = this;
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127
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128 WatcherThread* thread = WatcherThread::watcher_thread();
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129 if (thread) {
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130 thread->unpark();
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131 } else {
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132 WatcherThread::start();
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133 }
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134 }
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135
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136 /* disenroll could be called from a JavaThread, so we have to check for
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137 * safepoint when taking the lock to avoid deadlocking */
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138 void PeriodicTask::disenroll() {
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139 MutexLockerEx ml(PeriodicTask_lock->owned_by_self() ?
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140 NULL : PeriodicTask_lock);
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141
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142 int index;
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143 for(index = 0; index < _num_tasks && _tasks[index] != this; index++)
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144 ;
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145
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146 if (index == _num_tasks) {
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147 return;
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148 }
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149
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150 _num_tasks--;
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151
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152 for (; index < _num_tasks; index++) {
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153 _tasks[index] = _tasks[index+1];
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154 }
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155 }