9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "gc/parallel/gcTaskManager.hpp"
27 #include "gc/parallel/gcTaskThread.hpp"
28 #include "gc/shared/gcId.hpp"
29 #include "memory/allocation.hpp"
30 #include "memory/allocation.inline.hpp"
31 #include "memory/resourceArea.hpp"
32 #include "runtime/handles.hpp"
33 #include "runtime/handles.inline.hpp"
34 #include "runtime/os.hpp"
35 #include "runtime/thread.hpp"
36
37 GCTaskThread::GCTaskThread(GCTaskManager* manager,
38 uint which,
39 uint processor_id) :
40 _manager(manager),
41 _processor_id(processor_id),
42 _time_stamps(NULL),
43 _time_stamp_index(0)
44 {
45 if (!os::create_thread(this, os::pgc_thread))
46 vm_exit_out_of_memory(0, OOM_MALLOC_ERROR, "Cannot create GC thread. Out of system resources.");
47
48 if (PrintGCTaskTimeStamps) {
49 _time_stamps = NEW_C_HEAP_ARRAY(GCTaskTimeStamp, GCTaskTimeStampEntries, mtGC);
50
51 guarantee(_time_stamps != NULL, "Sanity");
52 }
53 set_id(which);
54 set_name("ParGC Thread#%d", which);
55 }
56
57 GCTaskThread::~GCTaskThread() {
58 if (_time_stamps != NULL) {
59 FREE_C_HEAP_ARRAY(GCTaskTimeStamp, _time_stamps);
60 }
61 }
62
63 void GCTaskThread::start() {
64 os::start_thread(this);
65 }
66
67 GCTaskTimeStamp* GCTaskThread::time_stamp_at(uint index) {
68 guarantee(index < GCTaskTimeStampEntries, "increase GCTaskTimeStampEntries");
69
70 return &(_time_stamps[index]);
71 }
72
73 void GCTaskThread::print_task_time_stamps() {
74 assert(PrintGCTaskTimeStamps, "Sanity");
75 assert(_time_stamps != NULL, "Sanity (Probably set PrintGCTaskTimeStamps late)");
76
77 tty->print_cr("GC-Thread %u entries: %d", id(), _time_stamp_index);
78 for(uint i=0; i<_time_stamp_index; i++) {
79 GCTaskTimeStamp* time_stamp = time_stamp_at(i);
80 tty->print_cr("\t[ %s " JLONG_FORMAT " " JLONG_FORMAT " ]",
81 time_stamp->name(),
82 time_stamp->entry_time(),
83 time_stamp->exit_time());
84 }
85
86 // Reset after dumping the data
87 _time_stamp_index = 0;
88 }
89
90 // GC workers get tasks from the GCTaskManager and execute
91 // them in this method. If there are no tasks to execute,
92 // the GC workers wait in the GCTaskManager's get_task()
93 // for tasks to be enqueued for execution.
94
95 void GCTaskThread::run() {
96 // Set up the thread for stack overflow support
97 this->record_stack_base_and_size();
98 this->initialize_named_thread();
99 // Bind yourself to your processor.
100 if (processor_id() != GCTaskManager::sentinel_worker()) {
110 }
111 }
112 // Part of thread setup.
113 // ??? Are these set up once here to make subsequent ones fast?
114 HandleMark hm_outer;
115 ResourceMark rm_outer;
116
117 TimeStamp timer;
118
119 for (;/* ever */;) {
120 // These are so we can flush the resources allocated in the inner loop.
121 HandleMark hm_inner;
122 ResourceMark rm_inner;
123 for (; /* break */; ) {
124 // This will block until there is a task to be gotten.
125 GCTask* task = manager()->get_task(which());
126 GCIdMark gc_id_mark(task->gc_id());
127 // Record if this is an idle task for later use.
128 bool is_idle_task = task->is_idle_task();
129 // In case the update is costly
130 if (PrintGCTaskTimeStamps) {
131 timer.update();
132 }
133
134 jlong entry_time = timer.ticks();
135 char* name = task->name();
136
137 // If this is the barrier task, it can be destroyed
138 // by the GC task manager once the do_it() executes.
139 task->do_it(manager(), which());
140
141 // Use the saved value of is_idle_task because references
142 // using "task" are not reliable for the barrier task.
143 if (!is_idle_task) {
144 manager()->note_completion(which());
145
146 if (PrintGCTaskTimeStamps) {
147 assert(_time_stamps != NULL,
148 "Sanity (PrintGCTaskTimeStamps set late?)");
149
150 timer.update();
151
152 GCTaskTimeStamp* time_stamp = time_stamp_at(_time_stamp_index++);
153
154 time_stamp->set_name(name);
155 time_stamp->set_entry_time(entry_time);
156 time_stamp->set_exit_time(timer.ticks());
157 }
158 } else {
159 // idle tasks complete outside the normal accounting
160 // so that a task can complete without waiting for idle tasks.
161 // They have to be terminated separately.
162 IdleGCTask::destroy((IdleGCTask*)task);
163 set_is_working(true);
164 }
165
166 // Check if we should release our inner resources.
167 if (manager()->should_release_resources(which())) {
168 manager()->note_release(which());
169 break;
|
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "gc/parallel/gcTaskManager.hpp"
27 #include "gc/parallel/gcTaskThread.hpp"
28 #include "gc/shared/gcId.hpp"
29 #include "logging/log.hpp"
30 #include "memory/allocation.hpp"
31 #include "memory/allocation.inline.hpp"
32 #include "memory/resourceArea.hpp"
33 #include "runtime/atomic.inline.hpp"
34 #include "runtime/handles.hpp"
35 #include "runtime/handles.inline.hpp"
36 #include "runtime/os.hpp"
37 #include "runtime/thread.hpp"
38
39 GCTaskThread::GCTaskThread(GCTaskManager* manager,
40 uint which,
41 uint processor_id) :
42 _manager(manager),
43 _processor_id(processor_id),
44 _time_stamps(NULL),
45 _time_stamp_index(0)
46 {
47 if (!os::create_thread(this, os::pgc_thread))
48 vm_exit_out_of_memory(0, OOM_MALLOC_ERROR, "Cannot create GC thread. Out of system resources.");
49
50 set_id(which);
51 set_name("ParGC Thread#%d", which);
52 }
53
54 GCTaskThread::~GCTaskThread() {
55 if (_time_stamps != NULL) {
56 FREE_C_HEAP_ARRAY(GCTaskTimeStamp, _time_stamps);
57 }
58 }
59
60 void GCTaskThread::start() {
61 os::start_thread(this);
62 }
63
64 GCTaskTimeStamp* GCTaskThread::time_stamp_at(uint index) {
65 guarantee(index < GCTaskTimeStampEntries, "increase GCTaskTimeStampEntries");
66 if (_time_stamps == NULL) {
67 // We allocate the _time_stamps array lazily since logging can be enabled dynamically
68 GCTaskTimeStamp* time_stamps = NEW_C_HEAP_ARRAY(GCTaskTimeStamp, GCTaskTimeStampEntries, mtGC);
69 void* old = Atomic::cmpxchg_ptr(time_stamps, &_time_stamps, NULL);
70 if (old != NULL) {
71 // Someone already setup the time stamps
72 FREE_C_HEAP_ARRAY(GCTaskTimeStamp, time_stamps);
73 }
74 }
75
76 return &(_time_stamps[index]);
77 }
78
79 void GCTaskThread::print_task_time_stamps() {
80 assert(log_is_enabled(Debug, gc, task, time), "Sanity");
81 assert(_time_stamps != NULL, "Sanity");
82
83 log_debug(gc, task, time)("GC-Thread %u entries: %d", id(), _time_stamp_index);
84 for(uint i=0; i<_time_stamp_index; i++) {
85 GCTaskTimeStamp* time_stamp = time_stamp_at(i);
86 log_debug(gc, task, time)("\t[ %s " JLONG_FORMAT " " JLONG_FORMAT " ]",
87 time_stamp->name(),
88 time_stamp->entry_time(),
89 time_stamp->exit_time());
90 }
91
92 // Reset after dumping the data
93 _time_stamp_index = 0;
94 }
95
96 // GC workers get tasks from the GCTaskManager and execute
97 // them in this method. If there are no tasks to execute,
98 // the GC workers wait in the GCTaskManager's get_task()
99 // for tasks to be enqueued for execution.
100
101 void GCTaskThread::run() {
102 // Set up the thread for stack overflow support
103 this->record_stack_base_and_size();
104 this->initialize_named_thread();
105 // Bind yourself to your processor.
106 if (processor_id() != GCTaskManager::sentinel_worker()) {
116 }
117 }
118 // Part of thread setup.
119 // ??? Are these set up once here to make subsequent ones fast?
120 HandleMark hm_outer;
121 ResourceMark rm_outer;
122
123 TimeStamp timer;
124
125 for (;/* ever */;) {
126 // These are so we can flush the resources allocated in the inner loop.
127 HandleMark hm_inner;
128 ResourceMark rm_inner;
129 for (; /* break */; ) {
130 // This will block until there is a task to be gotten.
131 GCTask* task = manager()->get_task(which());
132 GCIdMark gc_id_mark(task->gc_id());
133 // Record if this is an idle task for later use.
134 bool is_idle_task = task->is_idle_task();
135 // In case the update is costly
136 if (log_is_enabled(Debug, gc, task, time)) {
137 timer.update();
138 }
139
140 jlong entry_time = timer.ticks();
141 char* name = task->name();
142
143 // If this is the barrier task, it can be destroyed
144 // by the GC task manager once the do_it() executes.
145 task->do_it(manager(), which());
146
147 // Use the saved value of is_idle_task because references
148 // using "task" are not reliable for the barrier task.
149 if (!is_idle_task) {
150 manager()->note_completion(which());
151
152 if (log_is_enabled(Debug, gc, task, time)) {
153 timer.update();
154
155 GCTaskTimeStamp* time_stamp = time_stamp_at(_time_stamp_index++);
156
157 time_stamp->set_name(name);
158 time_stamp->set_entry_time(entry_time);
159 time_stamp->set_exit_time(timer.ticks());
160 }
161 } else {
162 // idle tasks complete outside the normal accounting
163 // so that a task can complete without waiting for idle tasks.
164 // They have to be terminated separately.
165 IdleGCTask::destroy((IdleGCTask*)task);
166 set_is_working(true);
167 }
168
169 // Check if we should release our inner resources.
170 if (manager()->should_release_resources(which())) {
171 manager()->note_release(which());
172 break;
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