50
51 // Each thread has its own monitor. The i-th thread is responsible for signaling
52 // to thread i+1 if the number of buffers in the queue exceeds a threshold for this
53 // thread. Monitors are also used to wake up the threads during termination.
54 // The 0th (primary) worker is notified by mutator threads and has a special monitor.
55 if (!is_primary()) {
56 _monitor = new Monitor(Mutex::nonleaf, "Refinement monitor", true,
57 Monitor::_safepoint_check_never);
58 } else {
59 _monitor = DirtyCardQ_CBL_mon;
60 }
61 initialize();
62
63 // set name
64 set_name("G1 Refine#%d", worker_id);
65 create_and_start();
66 }
67
68 void ConcurrentG1RefineThread::initialize() {
69 // Current thread activation threshold
70 _threshold = MIN2<int>(cg1r()->thread_threshold_step() * (_worker_id + 1) + cg1r()->green_zone(),
71 cg1r()->yellow_zone());
72 // A thread deactivates once the number of buffer reached a deactivation threshold
73 _deactivation_threshold = MAX2<int>(_threshold - cg1r()->thread_threshold_step(), cg1r()->green_zone());
74 }
75
76 void ConcurrentG1RefineThread::wait_for_completed_buffers() {
77 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
78 MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag);
79 while (!_should_terminate && !is_active()) {
80 _monitor->wait(Mutex::_no_safepoint_check_flag);
81 }
82 }
83
84 bool ConcurrentG1RefineThread::is_active() {
85 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
86 return is_primary() ? dcqs.process_completed_buffers() : _active;
87 }
88
89 void ConcurrentG1RefineThread::activate() {
90 MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag);
91 if (!is_primary()) {
92 set_active(true);
93 } else {
110 void ConcurrentG1RefineThread::run() {
111 initialize_in_thread();
112 wait_for_universe_init();
113
114 run_service();
115
116 terminate();
117 }
118
119 void ConcurrentG1RefineThread::run_service() {
120 _vtime_start = os::elapsedVTime();
121
122 while (!_should_terminate) {
123 // Wait for work
124 wait_for_completed_buffers();
125 if (_should_terminate) {
126 break;
127 }
128
129 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
130 log_debug(gc, refine)("Activated %d, on threshold: %d, current: %d",
131 _worker_id, _threshold, dcqs.completed_buffers_num());
132
133 {
134 SuspendibleThreadSetJoiner sts_join;
135
136 do {
137 int curr_buffer_num = (int)dcqs.completed_buffers_num();
138 // If the number of the buffers falls down into the yellow zone,
139 // that means that the transition period after the evacuation pause has ended.
140 if (dcqs.completed_queue_padding() > 0 && curr_buffer_num <= cg1r()->yellow_zone()) {
141 dcqs.set_completed_queue_padding(0);
142 }
143
144 // Check if we need to activate the next thread.
145 if (_next != NULL && !_next->is_active() && curr_buffer_num > _next->_threshold) {
146 _next->activate();
147 }
148 } while (dcqs.apply_closure_to_completed_buffer(_refine_closure,
149 _worker_id + _worker_id_offset,
150 _deactivation_threshold,
151 false /* during_pause */));
152
153 deactivate();
154 log_debug(gc, refine)("Deactivated %d, off threshold: %d, current: %d",
155 _worker_id, _deactivation_threshold,
156 dcqs.completed_buffers_num());
157 }
158
159 if (os::supports_vtime()) {
160 _vtime_accum = (os::elapsedVTime() - _vtime_start);
161 } else {
162 _vtime_accum = 0.0;
163 }
164 }
165
166 log_debug(gc, refine)("Stopping %d", _worker_id);
167 }
168
169 void ConcurrentG1RefineThread::stop() {
170 // it is ok to take late safepoints here, if needed
171 {
172 MutexLockerEx mu(Terminator_lock);
173 _should_terminate = true;
174 }
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50
51 // Each thread has its own monitor. The i-th thread is responsible for signaling
52 // to thread i+1 if the number of buffers in the queue exceeds a threshold for this
53 // thread. Monitors are also used to wake up the threads during termination.
54 // The 0th (primary) worker is notified by mutator threads and has a special monitor.
55 if (!is_primary()) {
56 _monitor = new Monitor(Mutex::nonleaf, "Refinement monitor", true,
57 Monitor::_safepoint_check_never);
58 } else {
59 _monitor = DirtyCardQ_CBL_mon;
60 }
61 initialize();
62
63 // set name
64 set_name("G1 Refine#%d", worker_id);
65 create_and_start();
66 }
67
68 void ConcurrentG1RefineThread::initialize() {
69 // Current thread activation threshold
70 _threshold = MIN2(cg1r()->thread_threshold_step() * (_worker_id + 1) + cg1r()->green_zone(),
71 cg1r()->yellow_zone());
72 // A thread deactivates once the number of buffer reached a deactivation threshold
73 _deactivation_threshold =
74 MAX2(_threshold - MIN2(_threshold, cg1r()->thread_threshold_step()),
75 cg1r()->green_zone());
76 }
77
78 void ConcurrentG1RefineThread::wait_for_completed_buffers() {
79 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
80 MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag);
81 while (!_should_terminate && !is_active()) {
82 _monitor->wait(Mutex::_no_safepoint_check_flag);
83 }
84 }
85
86 bool ConcurrentG1RefineThread::is_active() {
87 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
88 return is_primary() ? dcqs.process_completed_buffers() : _active;
89 }
90
91 void ConcurrentG1RefineThread::activate() {
92 MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag);
93 if (!is_primary()) {
94 set_active(true);
95 } else {
112 void ConcurrentG1RefineThread::run() {
113 initialize_in_thread();
114 wait_for_universe_init();
115
116 run_service();
117
118 terminate();
119 }
120
121 void ConcurrentG1RefineThread::run_service() {
122 _vtime_start = os::elapsedVTime();
123
124 while (!_should_terminate) {
125 // Wait for work
126 wait_for_completed_buffers();
127 if (_should_terminate) {
128 break;
129 }
130
131 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
132 log_debug(gc, refine)("Activated %d, on threshold: " SIZE_FORMAT ", current: " SIZE_FORMAT,
133 _worker_id, _threshold, dcqs.completed_buffers_num());
134
135 {
136 SuspendibleThreadSetJoiner sts_join;
137
138 do {
139 size_t curr_buffer_num = dcqs.completed_buffers_num();
140 // If the number of the buffers falls down into the yellow zone,
141 // that means that the transition period after the evacuation pause has ended.
142 if (dcqs.completed_queue_padding() > 0 && curr_buffer_num <= cg1r()->yellow_zone()) {
143 dcqs.set_completed_queue_padding(0);
144 }
145
146 // Check if we need to activate the next thread.
147 if (_next != NULL && !_next->is_active() && curr_buffer_num > _next->_threshold) {
148 _next->activate();
149 }
150 } while (dcqs.apply_closure_to_completed_buffer(_refine_closure,
151 _worker_id + _worker_id_offset,
152 _deactivation_threshold,
153 false /* during_pause */));
154
155 deactivate();
156 log_debug(gc, refine)("Deactivated %d, off threshold: " SIZE_FORMAT ", current: " SIZE_FORMAT,
157 _worker_id, _deactivation_threshold,
158 dcqs.completed_buffers_num());
159 }
160
161 if (os::supports_vtime()) {
162 _vtime_accum = (os::elapsedVTime() - _vtime_start);
163 } else {
164 _vtime_accum = 0.0;
165 }
166 }
167
168 log_debug(gc, refine)("Stopping %d", _worker_id);
169 }
170
171 void ConcurrentG1RefineThread::stop() {
172 // it is ok to take late safepoints here, if needed
173 {
174 MutexLockerEx mu(Terminator_lock);
175 _should_terminate = true;
176 }
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