1102 // if/when we decide that refs discovery is sufficiently
1103 // rare that the cost of the CAS's involved is in the
1104 // noise. That's a measurement that should be done, and
1105 // the code simplified if that turns out to be the case.
1106 return ConcGCThreads > 1;
1107 }
1108
1109 // Override
1110 virtual void ref_processor_init();
1111
1112 void clear_expansion_cause() { _expansion_cause = CMSExpansionCause::_no_expansion; }
1113
1114 // Space enquiries
1115 double occupancy() const { return ((double)used())/((double)capacity()); }
1116 size_t contiguous_available() const;
1117 size_t unsafe_max_alloc_nogc() const;
1118
1119 // over-rides
1120 MemRegion used_region_at_save_marks() const;
1121
1122 // Does a "full" (forced) collection invoked on this generation collect
1123 // the young generation as well?
1124 virtual bool full_collects_young_generation() const {
1125 return !ScavengeBeforeFullGC;
1126 }
1127
1128 // Adjust quantities in the generation affected by
1129 // the compaction.
1130 void reset_after_compaction();
1131
1132 // Allocation support
1133 HeapWord* allocate(size_t size, bool tlab);
1134 HeapWord* have_lock_and_allocate(size_t size, bool tlab);
1135 oop promote(oop obj, size_t obj_size);
1136 HeapWord* par_allocate(size_t size, bool tlab) {
1137 return allocate(size, tlab);
1138 }
1139
1140
1141 // Used by CMSStats to track direct allocation. The value is sampled and
1142 // reset after each young gen collection.
1143 size_t direct_allocated_words() const { return _direct_allocated_words; }
1144 void reset_direct_allocated_words() { _direct_allocated_words = 0; }
1145
1146 // Overrides for parallel promotion.
1147 virtual oop par_promote(int thread_num,
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1102 // if/when we decide that refs discovery is sufficiently
1103 // rare that the cost of the CAS's involved is in the
1104 // noise. That's a measurement that should be done, and
1105 // the code simplified if that turns out to be the case.
1106 return ConcGCThreads > 1;
1107 }
1108
1109 // Override
1110 virtual void ref_processor_init();
1111
1112 void clear_expansion_cause() { _expansion_cause = CMSExpansionCause::_no_expansion; }
1113
1114 // Space enquiries
1115 double occupancy() const { return ((double)used())/((double)capacity()); }
1116 size_t contiguous_available() const;
1117 size_t unsafe_max_alloc_nogc() const;
1118
1119 // over-rides
1120 MemRegion used_region_at_save_marks() const;
1121
1122 // Adjust quantities in the generation affected by
1123 // the compaction.
1124 void reset_after_compaction();
1125
1126 // Allocation support
1127 HeapWord* allocate(size_t size, bool tlab);
1128 HeapWord* have_lock_and_allocate(size_t size, bool tlab);
1129 oop promote(oop obj, size_t obj_size);
1130 HeapWord* par_allocate(size_t size, bool tlab) {
1131 return allocate(size, tlab);
1132 }
1133
1134
1135 // Used by CMSStats to track direct allocation. The value is sampled and
1136 // reset after each young gen collection.
1137 size_t direct_allocated_words() const { return _direct_allocated_words; }
1138 void reset_direct_allocated_words() { _direct_allocated_words = 0; }
1139
1140 // Overrides for parallel promotion.
1141 virtual oop par_promote(int thread_num,
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