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1
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2 /*
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3 * Copyright 2002-2007 Sun Microsystems, Inc. All Rights Reserved.
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4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 *
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6 * This code is free software; you can redistribute it and/or modify it
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7 * under the terms of the GNU General Public License version 2 only, as
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8 * published by the Free Software Foundation.
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9 *
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10 * This code is distributed in the hope that it will be useful, but WITHOUT
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11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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13 * version 2 for more details (a copy is included in the LICENSE file that
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14 * accompanied this code).
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15 *
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16 * You should have received a copy of the GNU General Public License version
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17 * 2 along with this work; if not, write to the Free Software Foundation,
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18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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19 *
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20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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21 * CA 95054 USA or visit www.sun.com if you need additional information or
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22 * have any questions.
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23 *
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24 */
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25
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26 #include "incls/_precompiled.incl"
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27 #include "incls/_gcTaskThread.cpp.incl"
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28
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29 GCTaskThread::GCTaskThread(GCTaskManager* manager,
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30 uint which,
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31 uint processor_id) :
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32 _manager(manager),
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33 _processor_id(processor_id),
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34 _time_stamps(NULL),
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35 _time_stamp_index(0)
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36 {
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37 if (!os::create_thread(this, os::pgc_thread))
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38 vm_exit_out_of_memory(0, "Cannot create GC thread. Out of system resources.");
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39
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40 if (PrintGCTaskTimeStamps) {
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41 _time_stamps = NEW_C_HEAP_ARRAY(GCTaskTimeStamp, GCTaskTimeStampEntries );
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42
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43 guarantee(_time_stamps != NULL, "Sanity");
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44 }
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45 set_id(which);
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46 set_name("GC task thread#%d (ParallelGC)", which);
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47 }
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48
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49 GCTaskThread::~GCTaskThread() {
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50 if (_time_stamps != NULL) {
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51 FREE_C_HEAP_ARRAY(GCTaskTimeStamp, _time_stamps);
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52 }
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53 }
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54
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55 void GCTaskThread::start() {
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56 os::start_thread(this);
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57 }
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58
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59 GCTaskTimeStamp* GCTaskThread::time_stamp_at(uint index) {
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60 guarantee(index < GCTaskTimeStampEntries, "increase GCTaskTimeStampEntries");
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61
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62 return &(_time_stamps[index]);
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63 }
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64
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65 void GCTaskThread::print_task_time_stamps() {
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66 assert(PrintGCTaskTimeStamps, "Sanity");
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67 assert(_time_stamps != NULL, "Sanity (Probably set PrintGCTaskTimeStamps late)");
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68
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69 tty->print_cr("GC-Thread %u entries: %d", id(), _time_stamp_index);
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70 for(uint i=0; i<_time_stamp_index; i++) {
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71 GCTaskTimeStamp* time_stamp = time_stamp_at(i);
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72 tty->print_cr("\t[ %s " INT64_FORMAT " " INT64_FORMAT " ]",
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73 time_stamp->name(),
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74 time_stamp->entry_time(),
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75 time_stamp->exit_time());
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76 }
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77
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78 // Reset after dumping the data
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79 _time_stamp_index = 0;
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80 }
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81
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82 void GCTaskThread::print_on(outputStream* st) const {
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83 st->print("\"%s\" ", name());
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84 Thread::print_on(st);
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85 st->cr();
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86 }
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87
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88 void GCTaskThread::run() {
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89 // Set up the thread for stack overflow support
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90 this->record_stack_base_and_size();
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91 this->initialize_thread_local_storage();
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92 // Bind yourself to your processor.
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93 if (processor_id() != GCTaskManager::sentinel_worker()) {
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94 if (TraceGCTaskThread) {
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95 tty->print_cr("GCTaskThread::run: "
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96 " binding to processor %u", processor_id());
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97 }
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98 if (!os::bind_to_processor(processor_id())) {
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99 DEBUG_ONLY(
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100 warning("Couldn't bind GCTaskThread %u to processor %u",
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101 which(), processor_id());
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102 )
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103 }
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104 }
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105 // Part of thread setup.
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106 // ??? Are these set up once here to make subsequent ones fast?
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107 HandleMark hm_outer;
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108 ResourceMark rm_outer;
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109
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110 TimeStamp timer;
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111
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112 for (;/* ever */;) {
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113 // These are so we can flush the resources allocated in the inner loop.
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114 HandleMark hm_inner;
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115 ResourceMark rm_inner;
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116 for (; /* break */; ) {
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117 // This will block until there is a task to be gotten.
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118 GCTask* task = manager()->get_task(which());
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119
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120 // In case the update is costly
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121 if (PrintGCTaskTimeStamps) {
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122 timer.update();
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123 }
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124
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125 jlong entry_time = timer.ticks();
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126 char* name = task->name();
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127
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128 task->do_it(manager(), which());
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129 manager()->note_completion(which());
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130
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131 if (PrintGCTaskTimeStamps) {
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132 assert(_time_stamps != NULL, "Sanity (PrintGCTaskTimeStamps set late?)");
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133
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134 timer.update();
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135
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136 GCTaskTimeStamp* time_stamp = time_stamp_at(_time_stamp_index++);
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137
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138 time_stamp->set_name(name);
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139 time_stamp->set_entry_time(entry_time);
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140 time_stamp->set_exit_time(timer.ticks());
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141 }
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142
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143 // Check if we should release our inner resources.
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144 if (manager()->should_release_resources(which())) {
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145 manager()->note_release(which());
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146 break;
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147 }
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148 }
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149 }
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150 }
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