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src/hotspot/share/gc/g1/g1FullGCPrepareTask.cpp

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 17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 18  *
 19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 20  * or visit www.oracle.com if you need additional information or have any
 21  * questions.
 22  *
 23  */
 24 
 25 #include "precompiled.hpp"
 26 #include "gc/g1/g1CollectedHeap.hpp"
 27 #include "gc/g1/g1ConcurrentMarkBitMap.inline.hpp"
 28 #include "gc/g1/g1FullCollector.inline.hpp"
 29 #include "gc/g1/g1FullGCCompactionPoint.hpp"
 30 #include "gc/g1/g1FullGCMarker.hpp"
 31 #include "gc/g1/g1FullGCOopClosures.inline.hpp"
 32 #include "gc/g1/g1FullGCPrepareTask.hpp"
 33 #include "gc/g1/g1HotCardCache.hpp"
 34 #include "gc/g1/heapRegion.inline.hpp"
 35 #include "gc/shared/gcTraceTime.inline.hpp"
 36 #include "gc/shared/referenceProcessor.hpp"

 37 #include "logging/log.hpp"
 38 #include "memory/iterator.inline.hpp"
 39 #include "oops/oop.inline.hpp"
 40 #include "utilities/ticks.hpp"
 41 
 42 template<bool is_humongous>
 43 void G1FullGCPrepareTask::G1CalculatePointersClosure::free_pinned_region(HeapRegion* hr) {
 44   _regions_freed = true;
 45   if (is_humongous) {
 46     _g1h->free_humongous_region(hr, nullptr);
 47   } else {
 48     _g1h->free_region(hr, nullptr);
 49   }
 50   _collector->set_free(hr->hrm_index());
 51   prepare_for_compaction(hr);
 52 }
 53 
 54 bool G1FullGCPrepareTask::G1CalculatePointersClosure::do_heap_region(HeapRegion* hr) {
 55   bool force_not_compacted = false;
 56   if (should_compact(hr)) {

140   if (hr->is_pinned()) {
141     return false;
142   }
143   size_t live_words = _collector->live_words(hr->hrm_index());
144   size_t live_words_threshold = _collector->scope()->region_compaction_threshold();
145   // High live ratio region will not be compacted.
146   return live_words <= live_words_threshold;
147 }
148 
149 void G1FullGCPrepareTask::G1CalculatePointersClosure::reset_region_metadata(HeapRegion* hr) {
150   hr->rem_set()->clear();
151   hr->clear_cardtable();
152 
153   G1HotCardCache* hcc = _g1h->hot_card_cache();
154   if (hcc->use_cache()) {
155     hcc->reset_card_counts(hr);
156   }
157 }
158 
159 G1FullGCPrepareTask::G1PrepareCompactLiveClosure::G1PrepareCompactLiveClosure(G1FullGCCompactionPoint* cp) :
160     _cp(cp) { }
161 
162 size_t G1FullGCPrepareTask::G1PrepareCompactLiveClosure::apply(oop object) {
163   size_t size = object->size();
164   _cp->forward(object, size);
165   return size;
166 }
167 
168 size_t G1FullGCPrepareTask::G1RePrepareClosure::apply(oop obj) {
169   // We only re-prepare objects forwarded within the current region, so
170   // skip objects that are already forwarded to another region.
171   oop forwarded_to = obj->forwardee();
172   if (forwarded_to != NULL && !_current->is_in(forwarded_to)) {
173     return obj->size();


174   }
175 
176   // Get size and forward.
177   size_t size = obj->size();
178   _cp->forward(obj, size);
179 
180   return size;
181 }
182 
183 void G1FullGCPrepareTask::G1CalculatePointersClosure::prepare_for_compaction_work(G1FullGCCompactionPoint* cp,
184                                                                                   HeapRegion* hr) {
185   hr->set_compaction_top(hr->bottom());
186   if (!_collector->is_free(hr->hrm_index())) {
187     G1PrepareCompactLiveClosure prepare_compact(cp);
188     hr->apply_to_marked_objects(_bitmap, &prepare_compact);
189   }
190 }
191 
192 void G1FullGCPrepareTask::G1CalculatePointersClosure::prepare_for_compaction(HeapRegion* hr) {
193   if (!_cp->is_initialized()) {
194     hr->set_compaction_top(hr->bottom());
195     _cp->initialize(hr, true);
196   }
197   // Add region to the compaction queue and prepare it.
198   _cp->add(hr);

 17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 18  *
 19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 20  * or visit www.oracle.com if you need additional information or have any
 21  * questions.
 22  *
 23  */
 24 
 25 #include "precompiled.hpp"
 26 #include "gc/g1/g1CollectedHeap.hpp"
 27 #include "gc/g1/g1ConcurrentMarkBitMap.inline.hpp"
 28 #include "gc/g1/g1FullCollector.inline.hpp"
 29 #include "gc/g1/g1FullGCCompactionPoint.hpp"
 30 #include "gc/g1/g1FullGCMarker.hpp"
 31 #include "gc/g1/g1FullGCOopClosures.inline.hpp"
 32 #include "gc/g1/g1FullGCPrepareTask.hpp"
 33 #include "gc/g1/g1HotCardCache.hpp"
 34 #include "gc/g1/heapRegion.inline.hpp"
 35 #include "gc/shared/gcTraceTime.inline.hpp"
 36 #include "gc/shared/referenceProcessor.hpp"
 37 #include "gc/shared/slidingForwarding.inline.hpp"
 38 #include "logging/log.hpp"
 39 #include "memory/iterator.inline.hpp"
 40 #include "oops/oop.inline.hpp"
 41 #include "utilities/ticks.hpp"
 42 
 43 template<bool is_humongous>
 44 void G1FullGCPrepareTask::G1CalculatePointersClosure::free_pinned_region(HeapRegion* hr) {
 45   _regions_freed = true;
 46   if (is_humongous) {
 47     _g1h->free_humongous_region(hr, nullptr);
 48   } else {
 49     _g1h->free_region(hr, nullptr);
 50   }
 51   _collector->set_free(hr->hrm_index());
 52   prepare_for_compaction(hr);
 53 }
 54 
 55 bool G1FullGCPrepareTask::G1CalculatePointersClosure::do_heap_region(HeapRegion* hr) {
 56   bool force_not_compacted = false;
 57   if (should_compact(hr)) {

141   if (hr->is_pinned()) {
142     return false;
143   }
144   size_t live_words = _collector->live_words(hr->hrm_index());
145   size_t live_words_threshold = _collector->scope()->region_compaction_threshold();
146   // High live ratio region will not be compacted.
147   return live_words <= live_words_threshold;
148 }
149 
150 void G1FullGCPrepareTask::G1CalculatePointersClosure::reset_region_metadata(HeapRegion* hr) {
151   hr->rem_set()->clear();
152   hr->clear_cardtable();
153 
154   G1HotCardCache* hcc = _g1h->hot_card_cache();
155   if (hcc->use_cache()) {
156     hcc->reset_card_counts(hr);
157   }
158 }
159 
160 G1FullGCPrepareTask::G1PrepareCompactLiveClosure::G1PrepareCompactLiveClosure(G1FullGCCompactionPoint* cp) :
161     _cp(cp), _forwarding(G1CollectedHeap::heap()->forwarding()) { }
162 
163 size_t G1FullGCPrepareTask::G1PrepareCompactLiveClosure::apply(oop object) {
164   size_t size = object->size();
165   _cp->forward(_forwarding, object, size);
166   return size;
167 }
168 
169 size_t G1FullGCPrepareTask::G1RePrepareClosure::apply(oop obj) {
170   // We only re-prepare objects forwarded within the current region, so
171   // skip objects that are already forwarded to another region.
172   if (obj->is_forwarded()) {
173     oop forwarded_to = _forwarding->forwardee(obj);
174     if (!_current->is_in(forwarded_to)) {
175       return obj->size();
176     }
177   }
178 
179   // Get size and forward.
180   size_t size = obj->size();
181   _cp->forward(_forwarding, obj, size);
182 
183   return size;
184 }
185 
186 void G1FullGCPrepareTask::G1CalculatePointersClosure::prepare_for_compaction_work(G1FullGCCompactionPoint* cp,
187                                                                                   HeapRegion* hr) {
188   hr->set_compaction_top(hr->bottom());
189   if (!_collector->is_free(hr->hrm_index())) {
190     G1PrepareCompactLiveClosure prepare_compact(cp);
191     hr->apply_to_marked_objects(_bitmap, &prepare_compact);
192   }
193 }
194 
195 void G1FullGCPrepareTask::G1CalculatePointersClosure::prepare_for_compaction(HeapRegion* hr) {
196   if (!_cp->is_initialized()) {
197     hr->set_compaction_top(hr->bottom());
198     _cp->initialize(hr, true);
199   }
200   // Add region to the compaction queue and prepare it.
201   _cp->add(hr);
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