MAP_NOSYNC
MAP_NOSYNC | MAP_SHARED, fd, 0);
flags = MAP_FIXED | MAP_NOSYNC | MAP_PRIVATE;
flags |= MAP_NOSYNC;
MAP_NOCORE|MAP_NOSYNC|MAP_SHARED,
flags |= MAP_NOSYNC;
if (flags & MAP_NOSYNC)
flags |= MAP_NOSYNC;
flags = MAP_NOCORE | MAP_NOSYNC;