44
45 inline PSPromotionManager* PSPromotionManager::manager_array(uint index) {
46 assert(_manager_array != NULL, "access of NULL manager_array");
47 assert(index <= ParallelGCThreads, "out of range manager_array access");
48 return &_manager_array[index];
49 }
50
51 inline void PSPromotionManager::push_depth(ScannerTask task) {
52 claimed_stack_depth()->push(task);
53 }
54
55 template <class T>
56 inline void PSPromotionManager::claim_or_forward_depth(T* p) {
57 assert(should_scavenge(p, true), "revisiting object?");
58 assert(ParallelScavengeHeap::heap()->is_in(p), "pointer outside heap");
59 oop obj = RawAccess<IS_NOT_NULL>::oop_load(p);
60 Prefetch::write(obj->mark_addr(), 0);
61 push_depth(ScannerTask(p));
62 }
63
64 inline void PSPromotionManager::promotion_trace_event(oop new_obj, oop old_obj,
65 size_t obj_size,
66 uint age, bool tenured,
67 const PSPromotionLAB* lab) {
68 // Skip if memory allocation failed
69 if (new_obj != NULL) {
70 const ParallelScavengeTracer* gc_tracer = PSScavenge::gc_tracer();
71
72 if (lab != NULL) {
73 // Promotion of object through newly allocated PLAB
74 if (gc_tracer->should_report_promotion_in_new_plab_event()) {
75 size_t obj_bytes = obj_size * HeapWordSize;
76 size_t lab_size = lab->capacity();
77 gc_tracer->report_promotion_in_new_plab_event(old_obj->klass(), obj_bytes,
78 age, tenured, lab_size);
79 }
80 } else {
81 // Promotion of object directly to heap
82 if (gc_tracer->should_report_promotion_outside_plab_event()) {
83 size_t obj_bytes = obj_size * HeapWordSize;
84 gc_tracer->report_promotion_outside_plab_event(old_obj->klass(), obj_bytes,
85 age, tenured);
86 }
87 }
88 }
89 }
90
91 class PSPushContentsClosure: public BasicOopIterateClosure {
92 PSPromotionManager* _pm;
93 public:
94 PSPushContentsClosure(PSPromotionManager* pm) : BasicOopIterateClosure(PSScavenge::reference_processor()), _pm(pm) {}
95
96 template <typename T> void do_oop_nv(T* p) {
97 if (PSScavenge::should_scavenge(p)) {
98 _pm->claim_or_forward_depth(p);
99 }
100 }
101
102 virtual void do_oop(oop* p) { do_oop_nv(p); }
103 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
104 };
128 obj->oop_iterate_backwards(&pcc);
129 }
130 }
131
132 template<bool promote_immediately>
133 inline oop PSPromotionManager::copy_to_survivor_space(oop o) {
134 assert(should_scavenge(&o), "Sanity");
135
136 // NOTE! We must be very careful with any methods that access the mark
137 // in o. There may be multiple threads racing on it, and it may be forwarded
138 // at any time.
139 markWord m = o->mark();
140 if (!m.is_marked()) {
141 return copy_unmarked_to_survivor_space<promote_immediately>(o, m);
142 } else {
143 // Ensure any loads from the forwardee follow all changes that precede
144 // the release-cmpxchg that performed the forwarding, possibly in some
145 // other thread.
146 OrderAccess::acquire();
147 // Return the already installed forwardee.
148 return cast_to_oop(m.decode_pointer());
149 }
150 }
151
152 //
153 // This method is pretty bulky. It would be nice to split it up
154 // into smaller submethods, but we need to be careful not to hurt
155 // performance.
156 //
157 template<bool promote_immediately>
158 inline oop PSPromotionManager::copy_unmarked_to_survivor_space(oop o,
159 markWord test_mark) {
160 assert(should_scavenge(&o), "Sanity");
161
162 oop new_obj = NULL;
163 bool new_obj_is_tenured = false;
164 size_t new_obj_size = o->size();
165
166 // Find the objects age, MT safe.
167 uint age = (test_mark.has_displaced_mark_helper() /* o->has_displaced_mark() */) ?
168 test_mark.displaced_mark_helper().age() : test_mark.age();
169
170 if (!promote_immediately) {
171 // Try allocating obj in to-space (unless too old)
172 if (age < PSScavenge::tenuring_threshold()) {
173 new_obj = cast_to_oop(_young_lab.allocate(new_obj_size));
174 if (new_obj == NULL && !_young_gen_is_full) {
175 // Do we allocate directly, or flush and refill?
176 if (new_obj_size > (YoungPLABSize / 2)) {
177 // Allocate this object directly
178 new_obj = cast_to_oop(young_space()->cas_allocate(new_obj_size));
179 promotion_trace_event(new_obj, o, new_obj_size, age, false, NULL);
180 } else {
181 // Flush and fill
182 _young_lab.flush();
183
184 HeapWord* lab_base = young_space()->cas_allocate(YoungPLABSize);
185 if (lab_base != NULL) {
186 _young_lab.initialize(MemRegion(lab_base, YoungPLABSize));
187 // Try the young lab allocation again.
188 new_obj = cast_to_oop(_young_lab.allocate(new_obj_size));
189 promotion_trace_event(new_obj, o, new_obj_size, age, false, &_young_lab);
190 } else {
191 _young_gen_is_full = true;
192 }
193 }
194 }
195 }
196 }
197
198 // Otherwise try allocating obj tenured
199 if (new_obj == NULL) {
200 #ifndef PRODUCT
201 if (ParallelScavengeHeap::heap()->promotion_should_fail()) {
202 return oop_promotion_failed(o, test_mark);
203 }
204 #endif // #ifndef PRODUCT
205
206 new_obj = cast_to_oop(_old_lab.allocate(new_obj_size));
207 new_obj_is_tenured = true;
208
209 if (new_obj == NULL) {
210 if (!_old_gen_is_full) {
211 // Do we allocate directly, or flush and refill?
212 if (new_obj_size > (OldPLABSize / 2)) {
213 // Allocate this object directly
214 new_obj = cast_to_oop(old_gen()->allocate(new_obj_size));
215 promotion_trace_event(new_obj, o, new_obj_size, age, true, NULL);
216 } else {
217 // Flush and fill
218 _old_lab.flush();
219
220 HeapWord* lab_base = old_gen()->allocate(OldPLABSize);
221 if(lab_base != NULL) {
222 #ifdef ASSERT
223 // Delay the initialization of the promotion lab (plab).
224 // This exposes uninitialized plabs to card table processing.
225 if (GCWorkerDelayMillis > 0) {
226 os::naked_sleep(GCWorkerDelayMillis);
227 }
228 #endif
229 _old_lab.initialize(MemRegion(lab_base, OldPLABSize));
230 // Try the old lab allocation again.
231 new_obj = cast_to_oop(_old_lab.allocate(new_obj_size));
232 promotion_trace_event(new_obj, o, new_obj_size, age, true, &_old_lab);
233 }
234 }
235 }
236
237 // This is the promotion failed test, and code handling.
238 // The code belongs here for two reasons. It is slightly
239 // different than the code below, and cannot share the
240 // CAS testing code. Keeping the code here also minimizes
241 // the impact on the common case fast path code.
242
243 if (new_obj == NULL) {
244 _old_gen_is_full = true;
245 return oop_promotion_failed(o, test_mark);
246 }
247 }
248 }
249
250 assert(new_obj != NULL, "allocation should have succeeded");
251
252 // Copy obj
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44
45 inline PSPromotionManager* PSPromotionManager::manager_array(uint index) {
46 assert(_manager_array != NULL, "access of NULL manager_array");
47 assert(index <= ParallelGCThreads, "out of range manager_array access");
48 return &_manager_array[index];
49 }
50
51 inline void PSPromotionManager::push_depth(ScannerTask task) {
52 claimed_stack_depth()->push(task);
53 }
54
55 template <class T>
56 inline void PSPromotionManager::claim_or_forward_depth(T* p) {
57 assert(should_scavenge(p, true), "revisiting object?");
58 assert(ParallelScavengeHeap::heap()->is_in(p), "pointer outside heap");
59 oop obj = RawAccess<IS_NOT_NULL>::oop_load(p);
60 Prefetch::write(obj->mark_addr(), 0);
61 push_depth(ScannerTask(p));
62 }
63
64 inline void PSPromotionManager::promotion_trace_event(oop new_obj, oop old_obj, Klass* klass,
65 size_t obj_size,
66 uint age, bool tenured,
67 const PSPromotionLAB* lab) {
68 // Skip if memory allocation failed
69 if (new_obj != NULL) {
70 const ParallelScavengeTracer* gc_tracer = PSScavenge::gc_tracer();
71
72 if (lab != NULL) {
73 // Promotion of object through newly allocated PLAB
74 if (gc_tracer->should_report_promotion_in_new_plab_event()) {
75 size_t obj_bytes = obj_size * HeapWordSize;
76 size_t lab_size = lab->capacity();
77 gc_tracer->report_promotion_in_new_plab_event(klass, obj_bytes,
78 age, tenured, lab_size);
79 }
80 } else {
81 // Promotion of object directly to heap
82 if (gc_tracer->should_report_promotion_outside_plab_event()) {
83 size_t obj_bytes = obj_size * HeapWordSize;
84 gc_tracer->report_promotion_outside_plab_event(klass, obj_bytes,
85 age, tenured);
86 }
87 }
88 }
89 }
90
91 class PSPushContentsClosure: public BasicOopIterateClosure {
92 PSPromotionManager* _pm;
93 public:
94 PSPushContentsClosure(PSPromotionManager* pm) : BasicOopIterateClosure(PSScavenge::reference_processor()), _pm(pm) {}
95
96 template <typename T> void do_oop_nv(T* p) {
97 if (PSScavenge::should_scavenge(p)) {
98 _pm->claim_or_forward_depth(p);
99 }
100 }
101
102 virtual void do_oop(oop* p) { do_oop_nv(p); }
103 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
104 };
128 obj->oop_iterate_backwards(&pcc);
129 }
130 }
131
132 template<bool promote_immediately>
133 inline oop PSPromotionManager::copy_to_survivor_space(oop o) {
134 assert(should_scavenge(&o), "Sanity");
135
136 // NOTE! We must be very careful with any methods that access the mark
137 // in o. There may be multiple threads racing on it, and it may be forwarded
138 // at any time.
139 markWord m = o->mark();
140 if (!m.is_marked()) {
141 return copy_unmarked_to_survivor_space<promote_immediately>(o, m);
142 } else {
143 // Ensure any loads from the forwardee follow all changes that precede
144 // the release-cmpxchg that performed the forwarding, possibly in some
145 // other thread.
146 OrderAccess::acquire();
147 // Return the already installed forwardee.
148 return o->forwardee(m);
149 }
150 }
151
152 //
153 // This method is pretty bulky. It would be nice to split it up
154 // into smaller submethods, but we need to be careful not to hurt
155 // performance.
156 //
157 template<bool promote_immediately>
158 inline oop PSPromotionManager::copy_unmarked_to_survivor_space(oop o,
159 markWord test_mark) {
160 assert(should_scavenge(&o), "Sanity");
161
162 oop new_obj = NULL;
163 bool new_obj_is_tenured = false;
164 #ifdef _LP64
165 Klass* klass = test_mark.safe_klass();
166 #else
167 Klass* klass = o->klass();
168 #endif
169 size_t new_obj_size = o->size_given_klass(klass);
170
171 // Find the objects age, MT safe.
172 uint age = (test_mark.has_displaced_mark_helper() /* o->has_displaced_mark() */) ?
173 test_mark.displaced_mark_helper().age() : test_mark.age();
174
175 if (!promote_immediately) {
176 // Try allocating obj in to-space (unless too old)
177 if (age < PSScavenge::tenuring_threshold()) {
178 new_obj = cast_to_oop(_young_lab.allocate(new_obj_size));
179 if (new_obj == NULL && !_young_gen_is_full) {
180 // Do we allocate directly, or flush and refill?
181 if (new_obj_size > (YoungPLABSize / 2)) {
182 // Allocate this object directly
183 new_obj = cast_to_oop(young_space()->cas_allocate(new_obj_size));
184 promotion_trace_event(new_obj, o, klass, new_obj_size, age, false, NULL);
185 } else {
186 // Flush and fill
187 _young_lab.flush();
188
189 HeapWord* lab_base = young_space()->cas_allocate(YoungPLABSize);
190 if (lab_base != NULL) {
191 _young_lab.initialize(MemRegion(lab_base, YoungPLABSize));
192 // Try the young lab allocation again.
193 new_obj = cast_to_oop(_young_lab.allocate(new_obj_size));
194 promotion_trace_event(new_obj, o, klass, new_obj_size, age, false, &_young_lab);
195 } else {
196 _young_gen_is_full = true;
197 }
198 }
199 }
200 }
201 }
202
203 // Otherwise try allocating obj tenured
204 if (new_obj == NULL) {
205 #ifndef PRODUCT
206 if (ParallelScavengeHeap::heap()->promotion_should_fail()) {
207 return oop_promotion_failed(o, test_mark);
208 }
209 #endif // #ifndef PRODUCT
210
211 new_obj = cast_to_oop(_old_lab.allocate(new_obj_size));
212 new_obj_is_tenured = true;
213
214 if (new_obj == NULL) {
215 if (!_old_gen_is_full) {
216 // Do we allocate directly, or flush and refill?
217 if (new_obj_size > (OldPLABSize / 2)) {
218 // Allocate this object directly
219 new_obj = cast_to_oop(old_gen()->allocate(new_obj_size));
220 promotion_trace_event(new_obj, o, klass, new_obj_size, age, true, NULL);
221 } else {
222 // Flush and fill
223 _old_lab.flush();
224
225 HeapWord* lab_base = old_gen()->allocate(OldPLABSize);
226 if(lab_base != NULL) {
227 #ifdef ASSERT
228 // Delay the initialization of the promotion lab (plab).
229 // This exposes uninitialized plabs to card table processing.
230 if (GCWorkerDelayMillis > 0) {
231 os::naked_sleep(GCWorkerDelayMillis);
232 }
233 #endif
234 _old_lab.initialize(MemRegion(lab_base, OldPLABSize));
235 // Try the old lab allocation again.
236 new_obj = cast_to_oop(_old_lab.allocate(new_obj_size));
237 promotion_trace_event(new_obj, o, klass, new_obj_size, age, true, &_old_lab);
238 }
239 }
240 }
241
242 // This is the promotion failed test, and code handling.
243 // The code belongs here for two reasons. It is slightly
244 // different than the code below, and cannot share the
245 // CAS testing code. Keeping the code here also minimizes
246 // the impact on the common case fast path code.
247
248 if (new_obj == NULL) {
249 _old_gen_is_full = true;
250 return oop_promotion_failed(o, test_mark);
251 }
252 }
253 }
254
255 assert(new_obj != NULL, "allocation should have succeeded");
256
257 // Copy obj
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