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1. (WO2018042144) CACHE RETENTION DATA MANAGEMENT

Pub. No.:    WO/2018/042144    International Application No.:    PCT/GB2016/053252
Publication Date: Fri Mar 09 00:59:59 CET 2018 International Filing Date: Thu Oct 20 01:59:59 CEST 2016
IPC: G06F 12/128
G06F 12/0897
Applicants: ARM LIMITED
Inventors: WAUGH, Alex James
KASERIDIS, Dimitrios
BRUCE, Klas Magnus
FILIPPO, Michael
PUSDESRIS, Joseph Michael
JALAL, Jamshed
Title: CACHE RETENTION DATA MANAGEMENT
Abstract:
A data processing system (2) incorporates a first exclusive cache memory (8, 10) and a second exclusive cache memory (14). A snoop filter (18) located together with the second exclusive cache memory on one side of the communication interface (12) serves to track entries within the first exclusive cache memory. The snoop filter includes retention data storage circuitry to store retention data for controlling retention of cache entries within the second exclusive cache memory. Retention data transfer circuitry (20) serves to transfer the retention data to and from the retention data storage circuitry within the snoop filter and the second cache memory as the cache entries concerned are transferred between the second exclusive cache memory and the first exclusive cache memory.