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    • 21. 发明授权
    • Methods and apparatus for transferring cache block ownership
    • 用于传输缓存块所有权的方法和设备
    • US06775748B2
    • 2004-08-10
    • US10057493
    • 2002-01-24
    • Sujat JamilSamantha J. EdirisooriyaDavid E. MinerR. Frank O'BlenessSteven J. Tu
    • Sujat JamilSamantha J. EdirisooriyaDavid E. MinerR. Frank O'BlenessSteven J. Tu
    • G06F1200
    • G06F12/0833Y02D10/13
    • Methods and apparatus for transferring cache block ownership from a first cache to a second cache without performing a writeback to a main memory are disclosed. Prior to the ownership transfer, the first cache holds the memory block in an “owned” state, and the second cache holds the same memory block in a “shared” state. Main memory does not yet reflect modifications made to the memory block. When the processor associated with the first cache attempts to write-back the modified memory block to main memory, the second cache asserts a signal to the first cache which cancels the write-back. In addition, the memory block in the second cache changes to an “owned” state. If additional caches also hold the memory block, an arbitration mechanism selects one cache to be the new owner. In this manner, communications with main memory and power consumption are reduced.
    • 公开了用于将高速缓存块所有权从第一高速缓存转移到第二高速缓存而不对主存储器执行写回的方法和装置。 在所有权转移之前,第一缓存将内存块保存在“拥有”状态,并且第二高速缓存在相同的内存块处于“共享”状态。 主内存尚未反映对内存块的修改。 当与第一高速缓存相关联的处理器尝试将修改的存储器块回写到主存储器时,第二高速缓存向第一高速缓存确定一个信号,该信号取消回写。 另外,第二缓存中的内存块变为“拥有”状态。 如果其他高速缓存还保存内存块,仲裁机制将选择一个缓存作为新的所有者。 以这种方式,与主存储器和功耗的通信减少。