88
89 // Not a candidate
90 return false;
91 }
92
93 void G1StringDedup::enqueue_from_evacuation(bool from_young, bool to_young, uint worker_id, oop java_string) {
94 assert(is_enabled(), "String deduplication not enabled");
95 if (is_candidate_from_evacuation(from_young, to_young, java_string)) {
96 G1StringDedupQueue::push(worker_id, java_string);
97 }
98 }
99
100 void G1StringDedup::deduplicate(oop java_string) {
101 assert(is_enabled(), "String deduplication not enabled");
102 G1StringDedupStat dummy; // Statistics from this path is never used
103 G1StringDedupTable::deduplicate(java_string, dummy);
104 }
105
106 void G1StringDedup::oops_do(OopClosure* keep_alive) {
107 assert(is_enabled(), "String deduplication not enabled");
108 unlink_or_oops_do(NULL, keep_alive);
109 }
110
111 void G1StringDedup::unlink(BoolObjectClosure* is_alive) {
112 assert(is_enabled(), "String deduplication not enabled");
113 // Don't allow a potential resize or rehash during unlink, as the unlink
114 // operation itself might remove enough entries to invalidate such a decision.
115 unlink_or_oops_do(is_alive, NULL, false /* allow_resize_and_rehash */);
116 }
117
118 //
119 // Task for parallel unlink_or_oops_do() operation on the deduplication queue
120 // and table.
121 //
122 class G1StringDedupUnlinkOrOopsDoTask : public AbstractGangTask {
123 private:
124 G1StringDedupUnlinkOrOopsDoClosure _cl;
125
126 public:
127 G1StringDedupUnlinkOrOopsDoTask(BoolObjectClosure* is_alive,
128 OopClosure* keep_alive,
129 bool allow_resize_and_rehash) :
130 AbstractGangTask("G1StringDedupUnlinkOrOopsDoTask"),
131 _cl(is_alive, keep_alive, allow_resize_and_rehash) {
132 }
133
134 virtual void work(uint worker_id) {
135 double queue_fixup_start = os::elapsedTime();
136 G1StringDedupQueue::unlink_or_oops_do(&_cl);
137
138 double table_fixup_start = os::elapsedTime();
139 G1StringDedupTable::unlink_or_oops_do(&_cl, worker_id);
140
141 double queue_fixup_time_ms = (table_fixup_start - queue_fixup_start) * 1000.0;
142 double table_fixup_time_ms = (os::elapsedTime() - table_fixup_start) * 1000.0;
143 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy();
144 g1p->phase_times()->record_string_dedup_queue_fixup_worker_time(worker_id, queue_fixup_time_ms);
145 g1p->phase_times()->record_string_dedup_table_fixup_worker_time(worker_id, table_fixup_time_ms);
146 }
147 };
148
149 void G1StringDedup::unlink_or_oops_do(BoolObjectClosure* is_alive, OopClosure* keep_alive, bool allow_resize_and_rehash) {
150 assert(is_enabled(), "String deduplication not enabled");
151 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy();
152 g1p->phase_times()->note_string_dedup_fixup_start();
153 double fixup_start = os::elapsedTime();
154
155 G1StringDedupUnlinkOrOopsDoTask task(is_alive, keep_alive, allow_resize_and_rehash);
156 if (G1CollectedHeap::use_parallel_gc_threads()) {
157 G1CollectedHeap* g1h = G1CollectedHeap::heap();
158 g1h->set_par_threads();
159 g1h->workers()->run_task(&task);
160 g1h->set_par_threads(0);
161 } else {
162 task.work(0);
163 }
164
165 double fixup_time_ms = (os::elapsedTime() - fixup_start) * 1000.0;
166 g1p->phase_times()->record_string_dedup_fixup_time(fixup_time_ms);
167 g1p->phase_times()->note_string_dedup_fixup_end();
168 }
169
170 void G1StringDedup::threads_do(ThreadClosure* tc) {
171 assert(is_enabled(), "String deduplication not enabled");
172 tc->do_thread(G1StringDedupThread::thread());
173 }
174
175 void G1StringDedup::print_worker_threads_on(outputStream* st) {
176 assert(is_enabled(), "String deduplication not enabled");
177 G1StringDedupThread::thread()->print_on(st);
178 st->cr();
179 }
180
181 void G1StringDedup::verify() {
182 assert(is_enabled(), "String deduplication not enabled");
183 G1StringDedupQueue::verify();
184 G1StringDedupTable::verify();
185 }
186
187 G1StringDedupUnlinkOrOopsDoClosure::G1StringDedupUnlinkOrOopsDoClosure(BoolObjectClosure* is_alive,
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88
89 // Not a candidate
90 return false;
91 }
92
93 void G1StringDedup::enqueue_from_evacuation(bool from_young, bool to_young, uint worker_id, oop java_string) {
94 assert(is_enabled(), "String deduplication not enabled");
95 if (is_candidate_from_evacuation(from_young, to_young, java_string)) {
96 G1StringDedupQueue::push(worker_id, java_string);
97 }
98 }
99
100 void G1StringDedup::deduplicate(oop java_string) {
101 assert(is_enabled(), "String deduplication not enabled");
102 G1StringDedupStat dummy; // Statistics from this path is never used
103 G1StringDedupTable::deduplicate(java_string, dummy);
104 }
105
106 void G1StringDedup::oops_do(OopClosure* keep_alive) {
107 assert(is_enabled(), "String deduplication not enabled");
108 unlink_or_oops_do(NULL, keep_alive, true /* allow_resize_and_rehash */);
109 }
110
111 void G1StringDedup::unlink(BoolObjectClosure* is_alive) {
112 assert(is_enabled(), "String deduplication not enabled");
113 // Don't allow a potential resize or rehash during unlink, as the unlink
114 // operation itself might remove enough entries to invalidate such a decision.
115 unlink_or_oops_do(is_alive, NULL, false /* allow_resize_and_rehash */);
116 }
117
118 //
119 // Task for parallel unlink_or_oops_do() operation on the deduplication queue
120 // and table.
121 //
122 class G1StringDedupUnlinkOrOopsDoTask : public AbstractGangTask {
123 private:
124 G1StringDedupUnlinkOrOopsDoClosure _cl;
125 G1GCPhaseTimes* _phase_times;
126
127 public:
128 G1StringDedupUnlinkOrOopsDoTask(BoolObjectClosure* is_alive,
129 OopClosure* keep_alive,
130 bool allow_resize_and_rehash,
131 G1GCPhaseTimes* phase_times) :
132 AbstractGangTask("G1StringDedupUnlinkOrOopsDoTask"),
133 _cl(is_alive, keep_alive, allow_resize_and_rehash), _phase_times(phase_times) { }
134
135 virtual void work(uint worker_id) {
136 {
137 G1GCParPhaseTimesTracker x(_phase_times, G1GCPhaseTimes::StringDedupQueueFixup, worker_id);
138 G1StringDedupQueue::unlink_or_oops_do(&_cl);
139 }
140 {
141 G1GCParPhaseTimesTracker x(_phase_times, G1GCPhaseTimes::StringDedupTableFixup, worker_id);
142 G1StringDedupTable::unlink_or_oops_do(&_cl, worker_id);
143 }
144 }
145 };
146
147 void G1StringDedup::unlink_or_oops_do(BoolObjectClosure* is_alive,
148 OopClosure* keep_alive,
149 bool allow_resize_and_rehash,
150 G1GCPhaseTimes* phase_times) {
151 assert(is_enabled(), "String deduplication not enabled");
152
153 G1StringDedupUnlinkOrOopsDoTask task(is_alive, keep_alive, allow_resize_and_rehash, phase_times);
154 if (G1CollectedHeap::use_parallel_gc_threads()) {
155 G1CollectedHeap* g1h = G1CollectedHeap::heap();
156 g1h->set_par_threads();
157 g1h->workers()->run_task(&task);
158 g1h->set_par_threads(0);
159 } else {
160 task.work(0);
161 }
162 }
163
164 void G1StringDedup::threads_do(ThreadClosure* tc) {
165 assert(is_enabled(), "String deduplication not enabled");
166 tc->do_thread(G1StringDedupThread::thread());
167 }
168
169 void G1StringDedup::print_worker_threads_on(outputStream* st) {
170 assert(is_enabled(), "String deduplication not enabled");
171 G1StringDedupThread::thread()->print_on(st);
172 st->cr();
173 }
174
175 void G1StringDedup::verify() {
176 assert(is_enabled(), "String deduplication not enabled");
177 G1StringDedupQueue::verify();
178 G1StringDedupTable::verify();
179 }
180
181 G1StringDedupUnlinkOrOopsDoClosure::G1StringDedupUnlinkOrOopsDoClosure(BoolObjectClosure* is_alive,
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