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    • 9. 发明授权
    • Method and system for exclusive two-level caching in a chip-multiprocessor
    • 芯片多处理器专用二级缓存的方法和系统
    • US06912624B2
    • 2005-06-28
    • US10769824
    • 2004-02-02
    • Luiz Andre BarrosoKourosh GharachorlooAndreas Nowatzyk
    • Luiz Andre BarrosoKourosh GharachorlooAndreas Nowatzyk
    • G06F12/08G06F12/00
    • G06F12/0826G06F12/0811G06F2212/621
    • To maximize the effective use of on-chip cache, a method and system for exclusive two-level caching in a chip-multiprocessor are provided. The exclusive two-level caching in accordance with the present invention involves method relaxing the inclusion requirement in a two-level cache system in order to form an exclusive cache hierarchy. Additionally, the exclusive two-level caching involves providing a first-level tag-state structure in a first-level cache of the two-level cache system. The first tag-state structure has state information. The exclusive two-level caching also involves maintaining in a second-level cache of the two-level cache system a duplicate of the first-level tag-state structure and extending the state information in the duplicate of the first tag-state structure, but not in the first-level tag-state structure itself, to include an owner indication. The exclusive two-level caching further involves providing in the second-level cache a second tag-state structure so that a simultaneous lookup at the duplicate of the first tag-state structure and the second tag-state structure is possible. Moreover, the exclusive two-level caching involves associating a single owner with a cache line at any given time of its lifetime in the chip-multiprocessor.
    • 为了最大限度地有效利用片上高速缓存,提供了一种用于芯片多处理器中独占二级缓存的方法和系统。 根据本发明的独有的两级缓存涉及在二级缓存系统中放宽包含要求的方法,以便形成专用高速缓存层级。 此外,独占的两级缓存涉及在二级缓存系统的一级缓存中提供一级标签状态结构。 第一个标签状态结构具有状态信息。 专有的两级缓存还涉及在二级缓存系统的二级缓存中维护第一级标签状态结构的副本,并扩展第一标签状态结构的副本中的状态信息,但是 不在第一级标签状态结构本身,包括所有者指示。 专用的两级缓存进一步包括在第二级缓存中提供第二标签状态结构,使得在第一标签状态结构和第二标签状态结构的副本处的同时查找是可能的。 此外,独占的两级缓存涉及在单芯片多处理器的任何给定的生命周期将单个所有者与缓存线相关联。