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 "precompiled.hpp"
27 #include "gc/parallel/gcTaskManager.hpp"
28 #include "gc/parallel/gcTaskThread.hpp"
29 #include "gc/shared/gcId.hpp"
30 #include "memory/allocation.hpp"
31 #include "memory/allocation.inline.hpp"
32 #include "memory/resourceArea.hpp"
33 #include "runtime/handles.hpp"
34 #include "runtime/handles.inline.hpp"
35 #include "runtime/os.hpp"
36 #include "runtime/thread.hpp"
37
38 GCTaskThread::GCTaskThread(GCTaskManager* manager,
39 uint which,
40 uint processor_id) :
41 _manager(manager),
42 _processor_id(processor_id),
43 _time_stamps(NULL),
44 _time_stamp_index(0)
45 {
46 if (!os::create_thread(this, os::pgc_thread))
47 vm_exit_out_of_memory(0, OOM_MALLOC_ERROR, "Cannot create GC thread. Out of system resources.");
48
49 if (PrintGCTaskTimeStamps) {
50 _time_stamps = NEW_C_HEAP_ARRAY(GCTaskTimeStamp, GCTaskTimeStampEntries, mtGC);
51
52 guarantee(_time_stamps != NULL, "Sanity");
53 }
54 set_id(which);
55 set_name("ParGC Thread#%d", which);
56 }
57
58 GCTaskThread::~GCTaskThread() {
59 if (_time_stamps != NULL) {
60 FREE_C_HEAP_ARRAY(GCTaskTimeStamp, _time_stamps);
61 }
62 }
63
64 void GCTaskThread::start() {
65 os::start_thread(this);
66 }
67
68 GCTaskTimeStamp* GCTaskThread::time_stamp_at(uint index) {
69 guarantee(index < GCTaskTimeStampEntries, "increase GCTaskTimeStampEntries");
70
71 return &(_time_stamps[index]);
72 }
73
74 void GCTaskThread::print_task_time_stamps() {
75 assert(PrintGCTaskTimeStamps, "Sanity");
76 assert(_time_stamps != NULL, "Sanity (Probably set PrintGCTaskTimeStamps late)");
77
78 tty->print_cr("GC-Thread %u entries: %d", id(), _time_stamp_index);
79 for(uint i=0; i<_time_stamp_index; i++) {
80 GCTaskTimeStamp* time_stamp = time_stamp_at(i);
81 tty->print_cr("\t[ %s " JLONG_FORMAT " " JLONG_FORMAT " ]",
82 time_stamp->name(),
83 time_stamp->entry_time(),
84 time_stamp->exit_time());
85 }
86
87 // Reset after dumping the data
88 _time_stamp_index = 0;
89 }
90
91 // GC workers get tasks from the GCTaskManager and execute
92 // them in this method. If there are no tasks to execute,
93 // the GC workers wait in the GCTaskManager's get_task()
94 // for tasks to be enqueued for execution.
95
96 void GCTaskThread::run() {
97 // Set up the thread for stack overflow support
98 this->record_stack_base_and_size();
99 this->initialize_thread_local_storage();
100 this->initialize_named_thread();
101 // Bind yourself to your processor.
112 }
113 }
114 // Part of thread setup.
115 // ??? Are these set up once here to make subsequent ones fast?
116 HandleMark hm_outer;
117 ResourceMark rm_outer;
118
119 TimeStamp timer;
120
121 for (;/* ever */;) {
122 // These are so we can flush the resources allocated in the inner loop.
123 HandleMark hm_inner;
124 ResourceMark rm_inner;
125 for (; /* break */; ) {
126 // This will block until there is a task to be gotten.
127 GCTask* task = manager()->get_task(which());
128 GCIdMark gc_id_mark(task->gc_id());
129 // Record if this is an idle task for later use.
130 bool is_idle_task = task->is_idle_task();
131 // In case the update is costly
132 if (PrintGCTaskTimeStamps) {
133 timer.update();
134 }
135
136 jlong entry_time = timer.ticks();
137 char* name = task->name();
138
139 // If this is the barrier task, it can be destroyed
140 // by the GC task manager once the do_it() executes.
141 task->do_it(manager(), which());
142
143 // Use the saved value of is_idle_task because references
144 // using "task" are not reliable for the barrier task.
145 if (!is_idle_task) {
146 manager()->note_completion(which());
147
148 if (PrintGCTaskTimeStamps) {
149 assert(_time_stamps != NULL,
150 "Sanity (PrintGCTaskTimeStamps set late?)");
151
152 timer.update();
153
154 GCTaskTimeStamp* time_stamp = time_stamp_at(_time_stamp_index++);
155
156 time_stamp->set_name(name);
157 time_stamp->set_entry_time(entry_time);
158 time_stamp->set_exit_time(timer.ticks());
159 }
160 } else {
161 // idle tasks complete outside the normal accounting
162 // so that a task can complete without waiting for idle tasks.
163 // They have to be terminated separately.
164 IdleGCTask::destroy((IdleGCTask*)task);
165 set_is_working(true);
166 }
167
168 // Check if we should release our inner resources.
169 if (manager()->should_release_resources(which())) {
170 manager()->note_release(which());
171 break;
|
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 "precompiled.hpp"
27 #include "gc/parallel/gcTaskManager.hpp"
28 #include "gc/parallel/gcTaskThread.hpp"
29 #include "gc/shared/gcId.hpp"
30 #include "logging/log.hpp"
31 #include "memory/allocation.hpp"
32 #include "memory/allocation.inline.hpp"
33 #include "memory/resourceArea.hpp"
34 #include "runtime/atomic.inline.hpp"
35 #include "runtime/handles.hpp"
36 #include "runtime/handles.inline.hpp"
37 #include "runtime/os.hpp"
38 #include "runtime/thread.hpp"
39
40 GCTaskThread::GCTaskThread(GCTaskManager* manager,
41 uint which,
42 uint processor_id) :
43 _manager(manager),
44 _processor_id(processor_id),
45 _time_stamps(NULL),
46 _time_stamp_index(0)
47 {
48 if (!os::create_thread(this, os::pgc_thread))
49 vm_exit_out_of_memory(0, OOM_MALLOC_ERROR, "Cannot create GC thread. Out of system resources.");
50
51 set_id(which);
52 set_name("ParGC Thread#%d", which);
53 }
54
55 GCTaskThread::~GCTaskThread() {
56 if (_time_stamps != NULL) {
57 FREE_C_HEAP_ARRAY(GCTaskTimeStamp, _time_stamps);
58 }
59 }
60
61 void GCTaskThread::start() {
62 os::start_thread(this);
63 }
64
65 GCTaskTimeStamp* GCTaskThread::time_stamp_at(uint index) {
66 guarantee(index < GCTaskTimeStampEntries, "increase GCTaskTimeStampEntries");
67 if (_time_stamps == NULL) {
68 // We allocate the _time_stamps array lazily since logging can be enabled dynamically
69 GCTaskTimeStamp* time_stamps = NEW_C_HEAP_ARRAY(GCTaskTimeStamp, GCTaskTimeStampEntries, mtGC);
70 void* old = Atomic::cmpxchg_ptr(time_stamps, &_time_stamps, NULL);
71 if (old != NULL) {
72 // Someone already setup the time stamps
73 FREE_C_HEAP_ARRAY(GCTaskTimeStamp, time_stamps);
74 }
75 }
76
77 return &(_time_stamps[index]);
78 }
79
80 void GCTaskThread::print_task_time_stamps() {
81 assert((Log<LOG_TAGS(gc, task, time)>::is_debug()), "Sanity");
82 assert(_time_stamps != NULL, "Sanity");
83
84 log_debug(gc, task, time)("GC-Thread %u entries: %d", id(), _time_stamp_index);
85 for(uint i=0; i<_time_stamp_index; i++) {
86 GCTaskTimeStamp* time_stamp = time_stamp_at(i);
87 log_debug(gc, task, time)("\t[ %s " JLONG_FORMAT " " JLONG_FORMAT " ]",
88 time_stamp->name(),
89 time_stamp->entry_time(),
90 time_stamp->exit_time());
91 }
92
93 // Reset after dumping the data
94 _time_stamp_index = 0;
95 }
96
97 // GC workers get tasks from the GCTaskManager and execute
98 // them in this method. If there are no tasks to execute,
99 // the GC workers wait in the GCTaskManager's get_task()
100 // for tasks to be enqueued for execution.
101
102 void GCTaskThread::run() {
103 // Set up the thread for stack overflow support
104 this->record_stack_base_and_size();
105 this->initialize_thread_local_storage();
106 this->initialize_named_thread();
107 // Bind yourself to your processor.
118 }
119 }
120 // Part of thread setup.
121 // ??? Are these set up once here to make subsequent ones fast?
122 HandleMark hm_outer;
123 ResourceMark rm_outer;
124
125 TimeStamp timer;
126
127 for (;/* ever */;) {
128 // These are so we can flush the resources allocated in the inner loop.
129 HandleMark hm_inner;
130 ResourceMark rm_inner;
131 for (; /* break */; ) {
132 // This will block until there is a task to be gotten.
133 GCTask* task = manager()->get_task(which());
134 GCIdMark gc_id_mark(task->gc_id());
135 // Record if this is an idle task for later use.
136 bool is_idle_task = task->is_idle_task();
137 // In case the update is costly
138 if (Log<LOG_TAGS(gc, task, time)>::is_debug()) {
139 timer.update();
140 }
141
142 jlong entry_time = timer.ticks();
143 char* name = task->name();
144
145 // If this is the barrier task, it can be destroyed
146 // by the GC task manager once the do_it() executes.
147 task->do_it(manager(), which());
148
149 // Use the saved value of is_idle_task because references
150 // using "task" are not reliable for the barrier task.
151 if (!is_idle_task) {
152 manager()->note_completion(which());
153
154 if (Log<LOG_TAGS(gc, task, time)>::is_debug()) {
155 timer.update();
156
157 GCTaskTimeStamp* time_stamp = time_stamp_at(_time_stamp_index++);
158
159 time_stamp->set_name(name);
160 time_stamp->set_entry_time(entry_time);
161 time_stamp->set_exit_time(timer.ticks());
162 }
163 } else {
164 // idle tasks complete outside the normal accounting
165 // so that a task can complete without waiting for idle tasks.
166 // They have to be terminated separately.
167 IdleGCTask::destroy((IdleGCTask*)task);
168 set_is_working(true);
169 }
170
171 // Check if we should release our inner resources.
172 if (manager()->should_release_resources(which())) {
173 manager()->note_release(which());
174 break;
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