It's also possible to use a few low address bits for non-address information if you're willing to accept coarser alignment on all pointers. It's not as easy sin

It's also possible to use a few low address bits for non-address information if you're willing to accept coarser alignment on all pointers. It's not as easy since you have to mask off those lower bits before dereferencing, as opposed to simply relying on the MMU to ignore high bits you're using for tags or whatever.