796   }
 797   st->cr();
 798 }
 799 
 800 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
 801 
 802   assert(alignment <= Arguments::conservative_max_heap_alignment(),
 803          "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
 804          alignment, Arguments::conservative_max_heap_alignment());
 805 
 806   size_t total_reserved = align_size_up(heap_size, alignment);
 807   assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
 808       "heap size is too big for compressed oops");
 809 
 810   bool use_large_pages = UseLargePages && is_size_aligned(alignment, os::large_page_size());
 811   assert(!UseLargePages
 812       || UseParallelGC
 813       || use_large_pages, "Wrong alignment to use large pages");
 814 
 815   // Now create the space.
 816   ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages);
 817 
 818   if (total_rs.is_reserved()) {
 819     assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
 820            "must be exactly of required size and alignment");
 821     // We are good.
 822 
 823     if (UseCompressedOops) {
 824       // Universe::initialize_heap() will reset this to NULL if unscaled
 825       // or zero-based narrow oops are actually used.
 826       // Else heap start and base MUST differ, so that NULL can be encoded nonambigous.
 827       Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base());
 828     }
 829 
 830     return total_rs;
 831   }
 832 
 833   vm_exit_during_initialization(
 834     err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
 835             total_reserved/K));
 836 

 796   }
 797   st->cr();
 798 }
 799 
 800 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
 801 
 802   assert(alignment <= Arguments::conservative_max_heap_alignment(),
 803          "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
 804          alignment, Arguments::conservative_max_heap_alignment());
 805 
 806   size_t total_reserved = align_size_up(heap_size, alignment);
 807   assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
 808       "heap size is too big for compressed oops");
 809 
 810   bool use_large_pages = UseLargePages && is_size_aligned(alignment, os::large_page_size());
 811   assert(!UseLargePages
 812       || UseParallelGC
 813       || use_large_pages, "Wrong alignment to use large pages");
 814 
 815   // Now create the space.
 816   ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, FSDirForHeap);
 817 
 818   if (total_rs.is_reserved()) {
 819     assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
 820            "must be exactly of required size and alignment");
 821     // We are good.
 822 
 823     if (UseCompressedOops) {
 824       // Universe::initialize_heap() will reset this to NULL if unscaled
 825       // or zero-based narrow oops are actually used.
 826       // Else heap start and base MUST differ, so that NULL can be encoded nonambigous.
 827       Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base());
 828     }
 829 
 830     return total_rs;
 831   }
 832 
 833   vm_exit_during_initialization(
 834     err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
 835             total_reserved/K));
 836