Directory Look Aside Table Controls
Original Publication Date: 1981-Jul-01
Included in the Prior Art Database: 2005-Feb-12
In a virtual memory system, it is often desirable for performance reasons to keep protection keys associated with real address X in the Directory Look-Aside Table (DLAT) entry that translates a virtual address to real address X. The problem that this creates, however, is that somehow that DLAT entry must be invalidated should the key value be changed by programs executing within the system. A mechanism is proposed to accomplish this invalidation process by using the existing compare functions(s) already required to perform the system storage protection function.