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 log_debug(gc, refine)("G1-Refine-activated worker %d, on threshold %d, current %d",
93 _worker_id, _threshold, JavaThread::dirty_card_queue_set().completed_buffers_num());
94 set_active(true);
95 } else {
96 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
97 dcqs.set_process_completed(true);
98 }
99 _monitor->notify();
100 }
101
102 void ConcurrentG1RefineThread::deactivate() {
103 MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag);
104 if (!is_primary()) {
105 log_debug(gc, refine)("G1-Refine-deactivated worker %d, off threshold %d, current %d",
106 _worker_id, _deactivation_threshold, JavaThread::dirty_card_queue_set().completed_buffers_num());
107 set_active(false);
108 } else {
109 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
110 dcqs.set_process_completed(false);
111 }
112 }
113
114 void ConcurrentG1RefineThread::run() {
115 initialize_in_thread();
116 wait_for_universe_init();
117
118 run_service();
119
120 terminate();
121 }
122
123 void ConcurrentG1RefineThread::run_service() {
124 _vtime_start = os::elapsedVTime();
125
126 while (!_should_terminate) {
127 // Wait for work
128 wait_for_completed_buffers();
129 if (_should_terminate) {
130 break;
131 }
132
133 {
134 SuspendibleThreadSetJoiner sts_join;
135 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
136
137 do {
138 int curr_buffer_num = (int)dcqs.completed_buffers_num();
139 // If the number of the buffers falls down into the yellow zone,
140 // that means that the transition period after the evacuation pause has ended.
141 if (dcqs.completed_queue_padding() > 0 && curr_buffer_num <= cg1r()->yellow_zone()) {
142 dcqs.set_completed_queue_padding(0);
143 }
144
145 if (!is_primary() && curr_buffer_num <= _deactivation_threshold) {
146 // If the number of the buffer has fallen below our threshold
147 // we should deactivate. The predecessor will reactivate this
148 // thread should the number of the buffers cross the threshold again.
149 deactivate();
150 break;
151 }
152
153 // Check if we need to activate the next thread.
154 if (_next != NULL && !_next->is_active() && curr_buffer_num > _next->_threshold) {
155 _next->activate();
156 }
157 } while (dcqs.apply_closure_to_completed_buffer(_refine_closure,
158 _worker_id + _worker_id_offset,
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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 = MAX2(_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 log_debug(gc, refine)("G1-Refine-activated worker %d, on threshold " SIZE_FORMAT ", current " SIZE_FORMAT,
93 _worker_id, _threshold, JavaThread::dirty_card_queue_set().completed_buffers_num());
94 set_active(true);
95 } else {
96 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
97 dcqs.set_process_completed(true);
98 }
99 _monitor->notify();
100 }
101
102 void ConcurrentG1RefineThread::deactivate() {
103 MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag);
104 if (!is_primary()) {
105 log_debug(gc, refine)("G1-Refine-deactivated worker %d, off threshold " SIZE_FORMAT ", current " SIZE_FORMAT,
106 _worker_id, _deactivation_threshold, JavaThread::dirty_card_queue_set().completed_buffers_num());
107 set_active(false);
108 } else {
109 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
110 dcqs.set_process_completed(false);
111 }
112 }
113
114 void ConcurrentG1RefineThread::run() {
115 initialize_in_thread();
116 wait_for_universe_init();
117
118 run_service();
119
120 terminate();
121 }
122
123 void ConcurrentG1RefineThread::run_service() {
124 _vtime_start = os::elapsedVTime();
125
126 while (!_should_terminate) {
127 // Wait for work
128 wait_for_completed_buffers();
129 if (_should_terminate) {
130 break;
131 }
132
133 {
134 SuspendibleThreadSetJoiner sts_join;
135 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
136
137 do {
138 size_t curr_buffer_num = dcqs.completed_buffers_num();
139 // If the number of the buffers falls down into the yellow zone,
140 // that means that the transition period after the evacuation pause has ended.
141 if (dcqs.completed_queue_padding() > 0 && curr_buffer_num <= cg1r()->yellow_zone()) {
142 dcqs.set_completed_queue_padding(0);
143 }
144
145 if (!is_primary() && curr_buffer_num <= _deactivation_threshold) {
146 // If the number of the buffer has fallen below our threshold
147 // we should deactivate. The predecessor will reactivate this
148 // thread should the number of the buffers cross the threshold again.
149 deactivate();
150 break;
151 }
152
153 // Check if we need to activate the next thread.
154 if (_next != NULL && !_next->is_active() && curr_buffer_num > _next->_threshold) {
155 _next->activate();
156 }
157 } while (dcqs.apply_closure_to_completed_buffer(_refine_closure,
158 _worker_id + _worker_id_offset,
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