src/share/vm/gc_implementation/g1/heapRegionRemSet.hpp

rev 7321 : 8048179: Early reclaim of large objects that are referenced by a few objects
Summary: Push the remembered sets of large objects with few referenced into the dirty card queue at the beginning of the evacuation so that they may end up with zero remembered set entries at the end of the collection, and are potentially reclaimed. Also improve timing measurements of the early reclaim mechanism, and shorten flag names.
Reviewed-by: brutisso, jmasa, dfazunen

*** 179,188 ****
--- 179,192 ----
  
    // For now.  Could "expand" some tables in the future, so that this made
    // sense.
    void add_reference(OopOrNarrowOopStar from, int tid);
  
+   // Returns whether this remembered set (and all sub-sets) have an occupancy
+   // that is less or equal than the given occupancy.
+   bool occupancy_less_or_equal_than(size_t limit) const;
+ 
    // Removes any entries shown by the given bitmaps to contain only dead
    // objects.
    void scrub(CardTableModRefBS* ctbs, BitMap* region_bm, BitMap* card_bm);
  
    // Returns whether this remembered set (and all sub-sets) contain no entries.
*** 274,283 ****
--- 278,291 ----
  
    bool is_empty() const {
      return (strong_code_roots_list_length() == 0) && _other_regions.is_empty();
    }
  
+   bool occupancy_less_or_equal_than(size_t occ) const {
+     return (strong_code_roots_list_length() == 0) && _other_regions.occupancy_less_or_equal_than(occ);
+   }
+ 
    size_t occupied() {
      MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag);
      return occupied_locked();
    }
    size_t occupied_locked() {