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

rev 7558 : 8048179: Early reclaim of large objects that are referenced by a few objects
Summary:
Reviewed-by:
rev 7559 : imported patch bengt-review
rev 7560 : [mq]: bengt-review2

*** 679,699 ****
    // 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 occ) const {
!   guarantee(occ <= (size_t)G1RSetSparseRegionEntries,
!             err_msg("Requested maximum occupancy must be smaller or equal than "
!                     SIZE_FORMAT" but is " SIZE_FORMAT, (size_t)G1RSetSparseRegionEntries, occ));
!   // The following statement is a simplification: although the predicate gives a
!   // value for the maximum total allowed remembered set entries we always only
!   // ever check the sparse remembered set for it.
!   // Getting the actual occupancy of even a single fine remembered set (a single
!   // coarse entry will almost always exceed the number the sparse remembered set can
!   // hold so we just check for zero here) is very expensive, so we do not do it.
!   return occ_coarse() == 0 && _first_all_fine_prts == NULL && occ_sparse() <= occ;
  }
  
  bool OtherRegionsTable::is_empty() const {
    return occ_sparse() == 0 && occ_coarse() == 0 && _first_all_fine_prts == NULL;
  }
--- 679,698 ----
    // 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;
  }