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

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

*** 692,701 ****
--- 692,713 ----
    // Since we may have deleted a from_card_cache entry from the RS, clear
    // the FCC.
    clear_fcc();
  }
  
+ bool OtherRegionsTable::occupancy_less_or_equal_than(size_t limit) const {
+   if (limit <= (size_t)G1RSetSparseRegionEntries) {
+     return occ_coarse() == 0 && _first_all_fine_prts == NULL && occ_sparse() <= limit;
+   } else {
+     // Current uses of this method may only use values less than G1RSetSparseRegionEntries
+     // for the limit. The solution, comparing against occupied() would be too slow
+     // at this time.
+     Unimplemented();
+     return false;
+   }
+ }
+ 
  bool OtherRegionsTable::is_empty() const {
    return occ_sparse() == 0 && occ_coarse() == 0 && _first_all_fine_prts == NULL;
  }
  
  size_t OtherRegionsTable::occupied() const {