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src/hotspot/share/gc/g1/g1FullGCCompactTask.cpp

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 14  *
 15  * You should have received a copy of the GNU General Public License version
 16  * 2 along with this work; if not, write to the Free Software Foundation,
 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.hpp"
 29 #include "gc/g1/g1FullCollector.inline.hpp"
 30 #include "gc/g1/g1FullGCCompactionPoint.hpp"
 31 #include "gc/g1/g1FullGCCompactTask.hpp"
 32 #include "gc/g1/heapRegion.inline.hpp"
 33 #include "gc/shared/gcTraceTime.inline.hpp"

 34 #include "logging/log.hpp"
 35 #include "oops/oop.inline.hpp"
 36 #include "utilities/ticks.hpp"
 37 
 38 // Do work for all skip-compacting regions.
 39 class G1ResetSkipCompactingClosure : public HeapRegionClosure {
 40   G1FullCollector* _collector;
 41 
 42 public:
 43   G1ResetSkipCompactingClosure(G1FullCollector* collector) : _collector(collector) { }
 44 
 45   bool do_heap_region(HeapRegion* r) {
 46     uint region_index = r->hrm_index();
 47     // Only for skip-compaction regions; early return otherwise.
 48     if (!_collector->is_skip_compacting(region_index)) {
 49 
 50       return false;
 51     }
 52     assert(_collector->live_words(region_index) > _collector->scope()->region_compaction_threshold() ||
 53          !r->is_starts_humongous() ||
 54          _collector->mark_bitmap()->is_marked(cast_to_oop(r->bottom())),
 55          "must be, otherwise reclaimed earlier");
 56     r->reset_skip_compacting_after_full_gc();
 57     return false;
 58   }
 59 };
 60 
 61 size_t G1FullGCCompactTask::G1CompactRegionClosure::apply(oop obj) {
 62   size_t size = obj->size();
 63   if (!obj->is_forwarded()) {
 64     // Object not moving
 65     return size;
 66   }
 67 
 68   HeapWord* destination = cast_from_oop<HeapWord*>(obj->forwardee());
 69 
 70   // copy object and reinit its mark
 71   HeapWord* obj_addr = cast_from_oop<HeapWord*>(obj);
 72   assert(obj_addr != destination, "everything in this pass should be moving");
 73   Copy::aligned_conjoint_words(obj_addr, destination, size);
 74   cast_to_oop(destination)->init_mark();
 75   assert(cast_to_oop(destination)->klass() != NULL, "should have a class");
 76 
 77   return size;
 78 }
 79 
 80 void G1FullGCCompactTask::compact_region(HeapRegion* hr) {
 81   assert(!hr->is_pinned(), "Should be no pinned region in compaction queue");
 82   assert(!hr->is_humongous(), "Should be no humongous regions in compaction queue");
 83 
 84   if (!collector()->is_free(hr->hrm_index())) {
 85     G1CompactRegionClosure compact(collector()->mark_bitmap());
 86     hr->apply_to_marked_objects(collector()->mark_bitmap(), &compact);
 87     // Clear the liveness information for this region if necessary i.e. if we actually look at it
 88     // for bitmap verification. Otherwise it is sufficient that we move the TAMS to bottom().

 14  *
 15  * You should have received a copy of the GNU General Public License version
 16  * 2 along with this work; if not, write to the Free Software Foundation,
 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.hpp"
 29 #include "gc/g1/g1FullCollector.inline.hpp"
 30 #include "gc/g1/g1FullGCCompactionPoint.hpp"
 31 #include "gc/g1/g1FullGCCompactTask.hpp"
 32 #include "gc/g1/heapRegion.inline.hpp"
 33 #include "gc/shared/gcTraceTime.inline.hpp"
 34 #include "gc/shared/slidingForwarding.inline.hpp"
 35 #include "logging/log.hpp"
 36 #include "oops/oop.inline.hpp"
 37 #include "utilities/ticks.hpp"
 38 
 39 // Do work for all skip-compacting regions.
 40 class G1ResetSkipCompactingClosure : public HeapRegionClosure {
 41   G1FullCollector* _collector;
 42 
 43 public:
 44   G1ResetSkipCompactingClosure(G1FullCollector* collector) : _collector(collector) { }
 45 
 46   bool do_heap_region(HeapRegion* r) {
 47     uint region_index = r->hrm_index();
 48     // Only for skip-compaction regions; early return otherwise.
 49     if (!_collector->is_skip_compacting(region_index)) {
 50 
 51       return false;
 52     }
 53     assert(_collector->live_words(region_index) > _collector->scope()->region_compaction_threshold() ||
 54          !r->is_starts_humongous() ||
 55          _collector->mark_bitmap()->is_marked(cast_to_oop(r->bottom())),
 56          "must be, otherwise reclaimed earlier");
 57     r->reset_skip_compacting_after_full_gc();
 58     return false;
 59   }
 60 };
 61 
 62 size_t G1FullGCCompactTask::G1CompactRegionClosure::apply(oop obj) {
 63   size_t size = obj->size();
 64   if (!obj->is_forwarded()) {
 65     // Object not moving
 66     return size;
 67   }
 68   HeapWord* destination = cast_from_oop<HeapWord*>(_forwarding->forwardee(obj));

 69 
 70   // copy object and reinit its mark
 71   HeapWord* obj_addr = cast_from_oop<HeapWord*>(obj);
 72   assert(obj_addr != destination, "everything in this pass should be moving");
 73   Copy::aligned_conjoint_words(obj_addr, destination, size);
 74   cast_to_oop(destination)->init_mark();
 75   assert(cast_to_oop(destination)->klass() != NULL, "should have a class");
 76 
 77   return size;
 78 }
 79 
 80 void G1FullGCCompactTask::compact_region(HeapRegion* hr) {
 81   assert(!hr->is_pinned(), "Should be no pinned region in compaction queue");
 82   assert(!hr->is_humongous(), "Should be no humongous regions in compaction queue");
 83 
 84   if (!collector()->is_free(hr->hrm_index())) {
 85     G1CompactRegionClosure compact(collector()->mark_bitmap());
 86     hr->apply_to_marked_objects(collector()->mark_bitmap(), &compact);
 87     // Clear the liveness information for this region if necessary i.e. if we actually look at it
 88     // for bitmap verification. Otherwise it is sufficient that we move the TAMS to bottom().
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