790 if (Universe::narrow_oop_shift() != 0) {
791 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift());
792 }
793
794 if (!Universe::narrow_oop_use_implicit_null_checks()) {
795 st->print(", no protected page in front of the heap");
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_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 // When AllocateOldGenAt is set, we cannot use largepages for entire heap memory.
811 // Only young gen which is allocated in dram can use large pages, but we currently don't support that.
812 bool use_large_pages = (AllocateOldGenAt != NULL) && UseLargePages && is_aligned(alignment, os::large_page_size());
813 assert(!UseLargePages
814 || UseParallelGC
815 || use_large_pages, "Wrong alignment to use large pages");
816
817 // Now create the space.
818 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt);
819
820 if (total_rs.is_reserved()) {
821 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
822 "must be exactly of required size and alignment");
823 // We are good.
824
825 if (UseCompressedOops) {
826 // Universe::initialize_heap() will reset this to NULL if unscaled
827 // or zero-based narrow oops are actually used.
828 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous.
829 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base());
830 }
831
832 if (AllocateHeapAt != NULL) {
833 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
834 }
835 return total_rs;
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790 if (Universe::narrow_oop_shift() != 0) {
791 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift());
792 }
793
794 if (!Universe::narrow_oop_use_implicit_null_checks()) {
795 st->print(", no protected page in front of the heap");
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_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_aligned(alignment, os::large_page_size());
811 assert(!UseLargePages
812 || UseParallelGC
813 || use_large_pages, "Wrong alignment to use large pages");
814
815 // When AllocateOldGenAt is set, we cannot use largepages for entire heap memory.
816 // Only young gen which is allocated in dram can use large pages, but we currently don't support that.
817 use_large_pages = (AllocateOldGenAt != NULL) ? false : use_large_pages;
818
819 // Now create the space.
820 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt);
821
822 if (total_rs.is_reserved()) {
823 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
824 "must be exactly of required size and alignment");
825 // We are good.
826
827 if (UseCompressedOops) {
828 // Universe::initialize_heap() will reset this to NULL if unscaled
829 // or zero-based narrow oops are actually used.
830 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous.
831 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base());
832 }
833
834 if (AllocateHeapAt != NULL) {
835 log_info(gc,heap)("Successfully allocated Java heap at location %s", AllocateHeapAt);
836 }
837 return total_rs;
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