1 2 /* 3 * Copyright (c) 2002, 2007, Oracle and/or its affiliates. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #include "incls/_precompiled.incl" 27 #include "incls/_gcTaskThread.cpp.incl" 28 29 GCTaskThread::GCTaskThread(GCTaskManager* manager, 30 uint which, 31 uint processor_id) : 32 _manager(manager), 33 _processor_id(processor_id), 34 _time_stamps(NULL), 35 _time_stamp_index(0) 36 { 37 if (!os::create_thread(this, os::pgc_thread)) 38 vm_exit_out_of_memory(0, "Cannot create GC thread. Out of system resources."); 39 40 if (PrintGCTaskTimeStamps) { 41 _time_stamps = NEW_C_HEAP_ARRAY(GCTaskTimeStamp, GCTaskTimeStampEntries ); 42 43 guarantee(_time_stamps != NULL, "Sanity"); 44 } 45 set_id(which); 46 set_name("GC task thread#%d (ParallelGC)", which); 47 } 48 49 GCTaskThread::~GCTaskThread() { 50 if (_time_stamps != NULL) { 51 FREE_C_HEAP_ARRAY(GCTaskTimeStamp, _time_stamps); 52 } 53 } 54 55 void GCTaskThread::start() { 56 os::start_thread(this); 57 } 58 59 GCTaskTimeStamp* GCTaskThread::time_stamp_at(uint index) { 60 guarantee(index < GCTaskTimeStampEntries, "increase GCTaskTimeStampEntries"); 61 62 return &(_time_stamps[index]); 63 } 64 65 void GCTaskThread::print_task_time_stamps() { 66 assert(PrintGCTaskTimeStamps, "Sanity"); 67 assert(_time_stamps != NULL, "Sanity (Probably set PrintGCTaskTimeStamps late)"); 68 69 tty->print_cr("GC-Thread %u entries: %d", id(), _time_stamp_index); 70 for(uint i=0; i<_time_stamp_index; i++) { 71 GCTaskTimeStamp* time_stamp = time_stamp_at(i); 72 tty->print_cr("\t[ %s " INT64_FORMAT " " INT64_FORMAT " ]", 73 time_stamp->name(), 74 time_stamp->entry_time(), 75 time_stamp->exit_time()); 76 } 77 78 // Reset after dumping the data 79 _time_stamp_index = 0; 80 } 81 82 void GCTaskThread::print_on(outputStream* st) const { 83 st->print("\"%s\" ", name()); 84 Thread::print_on(st); 85 st->cr(); 86 } 87 88 void GCTaskThread::run() { 89 // Set up the thread for stack overflow support 90 this->record_stack_base_and_size(); 91 this->initialize_thread_local_storage(); 92 // Bind yourself to your processor. 93 if (processor_id() != GCTaskManager::sentinel_worker()) { 94 if (TraceGCTaskThread) { 95 tty->print_cr("GCTaskThread::run: " 96 " binding to processor %u", processor_id()); 97 } 98 if (!os::bind_to_processor(processor_id())) { 99 DEBUG_ONLY( 100 warning("Couldn't bind GCTaskThread %u to processor %u", 101 which(), processor_id()); 102 ) 103 } 104 } 105 // Part of thread setup. 106 // ??? Are these set up once here to make subsequent ones fast? 107 HandleMark hm_outer; 108 ResourceMark rm_outer; 109 110 TimeStamp timer; 111 112 for (;/* ever */;) { 113 // These are so we can flush the resources allocated in the inner loop. 114 HandleMark hm_inner; 115 ResourceMark rm_inner; 116 for (; /* break */; ) { 117 // This will block until there is a task to be gotten. 118 GCTask* task = manager()->get_task(which()); 119 120 // In case the update is costly 121 if (PrintGCTaskTimeStamps) { 122 timer.update(); 123 } 124 125 jlong entry_time = timer.ticks(); 126 char* name = task->name(); 127 128 task->do_it(manager(), which()); 129 manager()->note_completion(which()); 130 131 if (PrintGCTaskTimeStamps) { 132 assert(_time_stamps != NULL, "Sanity (PrintGCTaskTimeStamps set late?)"); 133 134 timer.update(); 135 136 GCTaskTimeStamp* time_stamp = time_stamp_at(_time_stamp_index++); 137 138 time_stamp->set_name(name); 139 time_stamp->set_entry_time(entry_time); 140 time_stamp->set_exit_time(timer.ticks()); 141 } 142 143 // Check if we should release our inner resources. 144 if (manager()->should_release_resources(which())) { 145 manager()->note_release(which()); 146 break; 147 } 148 } 149 } 150 }