src/share/vm/gc_implementation/g1/g1PageBasedVirtualSpace.cpp

rev 7854 : 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29
Summary: Allow partial use of large pages for auxiliary data structures in G1.
Reviewed-by:
rev 7855 : imported patch 8058354-jon-fixes
rev 7856 : imported patch 8058354-fix-roundto-error

*** 70,80 ****
    _executable = rs.executable();
  
    _commit_size = commit_size;
  
    assert(_committed.size() == 0, "virtual space initialized more than once");
!   BitMap::idx_t size_in_commit_pages = round_to(rs.size(), commit_size);
    _committed.resize(size_in_commit_pages, /* in_resource_area */ false);
    if (_special) {
      _dirty.resize(size_in_commit_pages, /* in_resource_area */ false);
    }
  
--- 70,80 ----
    _executable = rs.executable();
  
    _commit_size = commit_size;
  
    assert(_committed.size() == 0, "virtual space initialized more than once");
!   BitMap::idx_t size_in_commit_pages = round_to(rs.size(), commit_size) / commit_size;
    _committed.resize(size_in_commit_pages, /* in_resource_area */ false);
    if (_special) {
      _dirty.resize(size_in_commit_pages, /* in_resource_area */ false);
    }