1. Apparatus for processing data comprising: an address translation cache to store a plurality of address translation entries; and eviction control circuitry to select a victim entry for eviction from said address translation cache from among said plurality of address translation entries; wherein said plurality of address translation entries are selected from among a plurality of different entry types of address translation entries representing translation data specified at respective different levels of address translation within a multiple-level page table walk; selection of said victim entry by said eviction control circuitry is dependent upon respective eviction control parameters associated with said plurality of address translation entries; and a given eviction control parameter for a given address translation entry is dependent upon an entry type of said given address translation entry among said plurality of different entry types of address translation entry.