Memory in circuitry 400 is not necessarily limited to memory 420. Rather, circuitry 400 may be said to have a “memory subsystem” that includes various types/locations of memory. For example, the memory subsystem of circuitry 400 may, in one embodiment, include memory 420, cache memory in processor unit 450, storage on I/O devices 440 (e.g., a hard drive, storage array, etc.), and so on. Accordingly, the phrase “memory subsystem” is representative of various types of possible memory media within circuitry 400. The memory subsystem of computer 400 may store program instructions executable by processor unit 450, including program instructions executable to implement the various techniques disclosed herein.