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comparison src/share/vm/gc_implementation/parallelScavenge/gcTaskThread.cpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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-1:000000000000 0:a61af66fc99e
1
2 /*
3 * Copyright 2002-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
22 * have any 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 }