*** old/src/share/vm/runtime/virtualspace.cpp	Thu Dec 13 11:24:57 2012
--- new/src/share/vm/runtime/virtualspace.cpp	Thu Dec 13 11:24:57 2012

*** 327,350 ****
--- 327,337 ----
  
      // Check alignment constraints
      if ((((size_t)base + noaccess_prefix) & (alignment - 1)) != 0) {
        // Base not aligned, retry
        if (!os::release_memory(base, size)) fatal("os::release_memory failed");
        // Reserve size large enough to do manual alignment and
        // increase size to a multiple of the desired alignment
        size = align_size_up(size, alignment);
        size_t extra_size = size + alignment;
        do {
          char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
          if (extra_base == NULL) return;
          // Do manual alignement
          base = (char*) align_size_up((uintptr_t) extra_base, alignment);
          assert(base >= extra_base, "just checking");
          // Re-reserve the region at the aligned base address.
          os::release_memory(extra_base, extra_size);
          base = os::reserve_memory(size, base);
        } while (base == NULL);
+       base = os::reserve_memory_aligned(size, alignment);
  
        if (requested_address != 0 &&
            failed_to_reserve_as_requested(base, requested_address, size, false)) {
          // As a result of the alignment constraints, the allocated base differs
          // from the requested address. Return back to the caller who can