130 }
131
132 virtual OldGCAllocRegion* old_gc_alloc_region(AllocationContext_t context) {
133 return &_old_gc_alloc_region;
134 }
135
136 virtual size_t used() {
137 assert(Heap_lock->owner() != NULL,
138 "Should be owned on this thread's behalf.");
139 size_t result = _summary_bytes_used;
140
141 // Read only once in case it is set to NULL concurrently
142 HeapRegion* hr = mutator_alloc_region(AllocationContext::current())->get();
143 if (hr != NULL) {
144 result += hr->used();
145 }
146 return result;
147 }
148 };
149
150 class G1ParGCAllocBuffer: public ParGCAllocBuffer {
151 private:
152 bool _retired;
153
154 public:
155 G1ParGCAllocBuffer(size_t gclab_word_size);
156 virtual ~G1ParGCAllocBuffer() {
157 guarantee(_retired, "Allocation buffer has not been retired");
158 }
159
160 virtual void set_buf(HeapWord* buf) {
161 ParGCAllocBuffer::set_buf(buf);
162 _retired = false;
163 }
164
165 virtual void retire() {
166 if (_retired) {
167 return;
168 }
169 ParGCAllocBuffer::retire();
170 _retired = true;
171 }
172 };
173
174 class G1ParGCAllocator : public CHeapObj<mtGC> {
175 friend class G1ParScanThreadState;
176 protected:
177 G1CollectedHeap* _g1h;
178
179 // The survivor alignment in effect in bytes.
180 // == 0 : don't align survivors
181 // != 0 : align survivors to that alignment
182 // These values were chosen to favor the non-alignment case since some
183 // architectures have a special compare against zero instructions.
184 const uint _survivor_alignment_bytes;
185
186 size_t _alloc_buffer_waste;
187 size_t _undo_waste;
188
189 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; }
190 void add_to_undo_waste(size_t waste) { _undo_waste += waste; }
191
192 virtual void retire_alloc_buffers() = 0;
193 virtual G1ParGCAllocBuffer* alloc_buffer(InCSetState dest, AllocationContext_t context) = 0;
194
195 // Calculate the survivor space object alignment in bytes. Returns that or 0 if
196 // there are no restrictions on survivor alignment.
197 static uint calc_survivor_alignment_bytes() {
198 assert(SurvivorAlignmentInBytes >= ObjectAlignmentInBytes, "sanity");
199 if (SurvivorAlignmentInBytes == ObjectAlignmentInBytes) {
200 // No need to align objects in the survivors differently, return 0
201 // which means "survivor alignment is not used".
202 return 0;
203 } else {
204 assert(SurvivorAlignmentInBytes > 0, "sanity");
205 return SurvivorAlignmentInBytes;
206 }
207 }
208
209 public:
210 G1ParGCAllocator(G1CollectedHeap* g1h) :
211 _g1h(g1h), _survivor_alignment_bytes(calc_survivor_alignment_bytes()),
212 _alloc_buffer_waste(0), _undo_waste(0) {
213 }
214
215 static G1ParGCAllocator* create_allocator(G1CollectedHeap* g1h);
216
217 size_t alloc_buffer_waste() { return _alloc_buffer_waste; }
218 size_t undo_waste() {return _undo_waste; }
219
220 // Allocate word_sz words in dest, either directly into the regions or by
221 // allocating a new PLAB. Returns the address of the allocated memory, NULL if
222 // not successful.
223 HeapWord* allocate_direct_or_new_plab(InCSetState dest,
224 size_t word_sz,
225 AllocationContext_t context);
226
227 // Allocate word_sz words in the PLAB of dest. Returns the address of the
228 // allocated memory, NULL if not successful.
229 HeapWord* plab_allocate(InCSetState dest,
230 size_t word_sz,
231 AllocationContext_t context) {
232 G1ParGCAllocBuffer* buffer = alloc_buffer(dest, context);
233 if (_survivor_alignment_bytes == 0) {
234 return buffer->allocate(word_sz);
235 } else {
236 return buffer->allocate_aligned(word_sz, _survivor_alignment_bytes);
237 }
238 }
239
240 HeapWord* allocate(InCSetState dest, size_t word_sz,
241 AllocationContext_t context) {
242 HeapWord* const obj = plab_allocate(dest, word_sz, context);
243 if (obj != NULL) {
244 return obj;
245 }
246 return allocate_direct_or_new_plab(dest, word_sz, context);
247 }
248
249 void undo_allocation(InCSetState dest, HeapWord* obj, size_t word_sz, AllocationContext_t context) {
250 if (alloc_buffer(dest, context)->contains(obj)) {
251 assert(alloc_buffer(dest, context)->contains(obj + word_sz - 1),
252 "should contain whole object");
253 alloc_buffer(dest, context)->undo_allocation(obj, word_sz);
254 } else {
255 CollectedHeap::fill_with_object(obj, word_sz);
256 add_to_undo_waste(word_sz);
257 }
258 }
259 };
260
261 class G1DefaultParGCAllocator : public G1ParGCAllocator {
262 G1ParGCAllocBuffer _surviving_alloc_buffer;
263 G1ParGCAllocBuffer _tenured_alloc_buffer;
264 G1ParGCAllocBuffer* _alloc_buffers[InCSetState::Num];
265
266 public:
267 G1DefaultParGCAllocator(G1CollectedHeap* g1h);
268
269 virtual G1ParGCAllocBuffer* alloc_buffer(InCSetState dest, AllocationContext_t context) {
270 assert(dest.is_valid(),
271 err_msg("Allocation buffer index out-of-bounds: " CSETSTATE_FORMAT, dest.value()));
272 assert(_alloc_buffers[dest.value()] != NULL,
273 err_msg("Allocation buffer is NULL: " CSETSTATE_FORMAT, dest.value()));
274 return _alloc_buffers[dest.value()];
275 }
276
277 virtual void retire_alloc_buffers() ;
278 };
279
280 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCATOR_HPP
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130 }
131
132 virtual OldGCAllocRegion* old_gc_alloc_region(AllocationContext_t context) {
133 return &_old_gc_alloc_region;
134 }
135
136 virtual size_t used() {
137 assert(Heap_lock->owner() != NULL,
138 "Should be owned on this thread's behalf.");
139 size_t result = _summary_bytes_used;
140
141 // Read only once in case it is set to NULL concurrently
142 HeapRegion* hr = mutator_alloc_region(AllocationContext::current())->get();
143 if (hr != NULL) {
144 result += hr->used();
145 }
146 return result;
147 }
148 };
149
150 class G1PLABWasteStat VALUE_OBJ_CLASS_SPEC {
151 private:
152 size_t _wasted;
153 size_t _undo_wasted;
154 public:
155
156 G1PLABWasteStat() : _wasted(0), _undo_wasted(0) {
157 }
158
159 void add_wasted(size_t word_sz) {
160 _wasted += word_sz;
161 }
162
163 void add_undo_wasted(size_t word_sz) {
164 _undo_wasted += word_sz;
165 }
166
167 size_t wasted() {
168 return _wasted;
169 }
170
171 size_t undo_wasted() {
172 return _undo_wasted;
173 }
174 };
175
176 class G1ParGCAllocBuffer: public ParGCAllocBuffer {
177 private:
178 bool _retired;
179
180 public:
181 G1ParGCAllocBuffer(size_t gclab_word_size);
182 virtual ~G1ParGCAllocBuffer() {
183 guarantee(_retired, "Allocation buffer has not been retired");
184 }
185
186 virtual void set_buf(HeapWord* buf) {
187 ParGCAllocBuffer::set_buf(buf);
188 _retired = false;
189 }
190
191 virtual void retire() {
192 if (_retired) {
193 return;
194 }
195 ParGCAllocBuffer::retire();
196 _retired = true;
197 }
198 };
199
200 class G1ParGCAllocator : public CHeapObj<mtGC> {
201 friend class G1ParScanThreadState;
202 protected:
203 G1CollectedHeap* _g1h;
204
205 // The survivor alignment in effect in bytes.
206 // == 0 : don't align survivors
207 // != 0 : align survivors to that alignment
208 // These values were chosen to favor the non-alignment case since some
209 // architectures have a special compare against zero instructions.
210 const uint _survivor_alignment_bytes;
211
212 virtual void retire_alloc_buffers() = 0;
213 virtual G1ParGCAllocBuffer* alloc_buffer(InCSetState dest, AllocationContext_t context) = 0;
214
215 // Calculate the survivor space object alignment in bytes. Returns that or 0 if
216 // there are no restrictions on survivor alignment.
217 static uint calc_survivor_alignment_bytes() {
218 assert(SurvivorAlignmentInBytes >= ObjectAlignmentInBytes, "sanity");
219 if (SurvivorAlignmentInBytes == ObjectAlignmentInBytes) {
220 // No need to align objects in the survivors differently, return 0
221 // which means "survivor alignment is not used".
222 return 0;
223 } else {
224 assert(SurvivorAlignmentInBytes > 0, "sanity");
225 return SurvivorAlignmentInBytes;
226 }
227 }
228
229 public:
230 G1ParGCAllocator(G1CollectedHeap* g1h) :
231 _g1h(g1h), _survivor_alignment_bytes(calc_survivor_alignment_bytes()) {
232 }
233
234 static G1ParGCAllocator* create_allocator(G1CollectedHeap* g1h);
235
236 virtual G1PLABWasteStat wasted() = 0;
237
238 // Allocate word_sz words in dest, either directly into the regions or by
239 // allocating a new PLAB. Returns the address of the allocated memory, NULL if
240 // not successful.
241 HeapWord* allocate_direct_or_new_plab(InCSetState dest,
242 size_t word_sz,
243 AllocationContext_t context);
244
245 // Allocate word_sz words in the PLAB of dest. Returns the address of the
246 // allocated memory, NULL if not successful.
247 HeapWord* plab_allocate(InCSetState dest,
248 size_t word_sz,
249 AllocationContext_t context) {
250 G1ParGCAllocBuffer* buffer = alloc_buffer(dest, context);
251 if (_survivor_alignment_bytes == 0) {
252 return buffer->allocate(word_sz);
253 } else {
254 return buffer->allocate_aligned(word_sz, _survivor_alignment_bytes);
255 }
256 }
257
258 HeapWord* allocate(InCSetState dest, size_t word_sz,
259 AllocationContext_t context) {
260 HeapWord* const obj = plab_allocate(dest, word_sz, context);
261 if (obj != NULL) {
262 return obj;
263 }
264 return allocate_direct_or_new_plab(dest, word_sz, context);
265 }
266
267 void undo_allocation(InCSetState dest, HeapWord* obj, size_t word_sz, AllocationContext_t context) {
268 alloc_buffer(dest, context)->undo_allocation(obj, word_sz);
269 }
270 };
271
272 class G1DefaultParGCAllocator : public G1ParGCAllocator {
273 G1ParGCAllocBuffer _surviving_alloc_buffer;
274 G1ParGCAllocBuffer _tenured_alloc_buffer;
275 G1ParGCAllocBuffer* _alloc_buffers[InCSetState::Num];
276
277 public:
278 G1DefaultParGCAllocator(G1CollectedHeap* g1h);
279
280 virtual G1ParGCAllocBuffer* alloc_buffer(InCSetState dest, AllocationContext_t context) {
281 assert(dest.is_valid(),
282 err_msg("Allocation buffer index out-of-bounds: " CSETSTATE_FORMAT, dest.value()));
283 assert(_alloc_buffers[dest.value()] != NULL,
284 err_msg("Allocation buffer is NULL: " CSETSTATE_FORMAT, dest.value()));
285 return _alloc_buffers[dest.value()];
286 }
287
288 virtual void retire_alloc_buffers();
289
290 virtual G1PLABWasteStat wasted();
291 };
292
293 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCATOR_HPP
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