167
168 // must nuke all dead objects which we skipped when iterating over the region
169 _cm->clearRangePrevBitmap(MemRegion(_end_of_last_gap, obj_end));
170 }
171 _end_of_last_gap = obj_end;
172 _last_obj_threshold = _hr->cross_threshold(obj_addr, obj_end);
173 }
174 };
175
176 class RemoveSelfForwardPtrHRClosure: public HeapRegionClosure {
177 G1CollectedHeap* _g1h;
178 ConcurrentMark* _cm;
179 uint _worker_id;
180 HeapRegionClaimer* _hrclaimer;
181
182 DirtyCardQueue _dcq;
183 UpdateRSetDeferred _update_rset_cl;
184
185 public:
186 RemoveSelfForwardPtrHRClosure(G1CollectedHeap* g1h,
187 uint worker_id,
188 HeapRegionClaimer* hrclaimer) :
189 _g1h(g1h), _dcq(&g1h->dirty_card_queue_set()), _update_rset_cl(g1h, &_dcq),
190 _worker_id(worker_id), _cm(_g1h->concurrent_mark()), _hrclaimer(hrclaimer) {
191 }
192
193 bool doHeapRegion(HeapRegion *hr) {
194 bool during_initial_mark = _g1h->g1_policy()->during_initial_mark_pause();
195 bool during_conc_mark = _g1h->mark_in_progress();
196
197 assert(!hr->is_humongous(), "sanity");
198 assert(hr->in_collection_set(), "bad CS");
199
200 if (_hrclaimer->claim_region(hr->hrm_index())) {
201 if (hr->evacuation_failed()) {
202 RemoveSelfForwardPtrObjClosure rspc(_g1h, _cm, hr, &_update_rset_cl,
203 during_initial_mark,
204 during_conc_mark,
205 _worker_id);
206
207 hr->note_self_forwarding_removal_start(during_initial_mark,
208 during_conc_mark);
209 _g1h->check_bitmaps("Self-Forwarding Ptr Removal", hr);
210
211 // In the common case (i.e. when there is no evacuation
212 // failure) we make sure that the following is done when
213 // the region is freed so that it is "ready-to-go" when it's
214 // re-allocated. However, when evacuation failure happens, a
215 // region will remain in the heap and might ultimately be added
216 // to a CSet in the future. So we have to be careful here and
217 // make sure the region's RSet is ready for parallel iteration
218 // whenever this might be required in the future.
219 hr->rem_set()->reset_for_par_iteration();
220 hr->reset_bot();
221 _update_rset_cl.set_region(hr);
222 hr->object_iterate(&rspc);
223
224 hr->rem_set()->clean_strong_code_roots(hr);
225
226 hr->note_self_forwarding_removal_end(during_initial_mark,
227 during_conc_mark,
228 rspc.marked_bytes());
229 }
230 }
231 return false;
232 }
233 };
234
235 class G1ParRemoveSelfForwardPtrsTask: public AbstractGangTask {
236 protected:
237 G1CollectedHeap* _g1h;
238 HeapRegionClaimer* _hrclaimer;
239
240 public:
241 G1ParRemoveSelfForwardPtrsTask(G1CollectedHeap* g1h, HeapRegionClaimer* hrclaimer) :
242 AbstractGangTask("G1 Remove Self-forwarding Pointers"), _g1h(g1h), _hrclaimer(hrclaimer) {}
243
244 void work(uint worker_id) {
245 RemoveSelfForwardPtrHRClosure rsfp_cl(_g1h, worker_id, _hrclaimer);
246
247 HeapRegion* hr = _g1h->start_cset_region_for_worker(worker_id);
248 _g1h->collection_set_iterate_from(hr, &rsfp_cl);
249 }
250 };
251
252 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1EVACFAILURE_HPP
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167
168 // must nuke all dead objects which we skipped when iterating over the region
169 _cm->clearRangePrevBitmap(MemRegion(_end_of_last_gap, obj_end));
170 }
171 _end_of_last_gap = obj_end;
172 _last_obj_threshold = _hr->cross_threshold(obj_addr, obj_end);
173 }
174 };
175
176 class RemoveSelfForwardPtrHRClosure: public HeapRegionClosure {
177 G1CollectedHeap* _g1h;
178 ConcurrentMark* _cm;
179 uint _worker_id;
180 HeapRegionClaimer* _hrclaimer;
181
182 DirtyCardQueue _dcq;
183 UpdateRSetDeferred _update_rset_cl;
184
185 public:
186 RemoveSelfForwardPtrHRClosure(G1CollectedHeap* g1h,
187 uint worker_id = 0,
188 HeapRegionClaimer* hrclaimer = NULL) :
189 _g1h(g1h), _dcq(&g1h->dirty_card_queue_set()), _update_rset_cl(g1h, &_dcq),
190 _worker_id(worker_id), _cm(_g1h->concurrent_mark()), _hrclaimer(hrclaimer) {
191 assert(hrclaimer != NULL || worker_id == 0, "Must use a HeapRegionClaimer when used in parallel.");
192 }
193
194 bool doHeapRegion(HeapRegion *hr) {
195 bool during_initial_mark = _g1h->g1_policy()->during_initial_mark_pause();
196 bool during_conc_mark = _g1h->mark_in_progress();
197
198 assert(!hr->is_humongous(), "sanity");
199 assert(hr->in_collection_set(), "bad CS");
200
201 if (_hrclaimer == NULL || _hrclaimer->claim_region(hr->hrm_index())) {
202 if (hr->evacuation_failed()) {
203 RemoveSelfForwardPtrObjClosure rspc(_g1h, _cm, hr, &_update_rset_cl,
204 during_initial_mark,
205 during_conc_mark,
206 _worker_id);
207
208 hr->note_self_forwarding_removal_start(during_initial_mark,
209 during_conc_mark);
210 _g1h->check_bitmaps("Self-Forwarding Ptr Removal", hr);
211
212 // In the common case (i.e. when there is no evacuation
213 // failure) we make sure that the following is done when
214 // the region is freed so that it is "ready-to-go" when it's
215 // re-allocated. However, when evacuation failure happens, a
216 // region will remain in the heap and might ultimately be added
217 // to a CSet in the future. So we have to be careful here and
218 // make sure the region's RSet is ready for parallel iteration
219 // whenever this might be required in the future.
220 hr->rem_set()->reset_for_par_iteration();
221 hr->reset_bot();
222 _update_rset_cl.set_region(hr);
223 hr->object_iterate(&rspc);
224
225 hr->rem_set()->clean_strong_code_roots(hr);
226
227 hr->note_self_forwarding_removal_end(during_initial_mark,
228 during_conc_mark,
229 rspc.marked_bytes());
230 }
231 }
232 return false;
233 }
234 };
235
236 class G1ParRemoveSelfForwardPtrsTask: public AbstractGangTask {
237 protected:
238 G1CollectedHeap* _g1h;
239 HeapRegionClaimer _hrclaimer;
240
241 public:
242 G1ParRemoveSelfForwardPtrsTask(G1CollectedHeap* g1h) :
243 AbstractGangTask("G1 Remove Self-forwarding Pointers"), _g1h(g1h),
244 _hrclaimer(g1h->workers()->active_workers()) {}
245
246 void work(uint worker_id) {
247 RemoveSelfForwardPtrHRClosure rsfp_cl(_g1h, worker_id, &_hrclaimer);
248
249 HeapRegion* hr = _g1h->start_cset_region_for_worker(worker_id);
250 _g1h->collection_set_iterate_from(hr, &rsfp_cl);
251 }
252 };
253
254 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1EVACFAILURE_HPP
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