e Write Miss to a Block in Modified State Re questor Processor p 1. Write Miss by p Shared cache Private cache Requesting block A emory Directory 3. Data block a 2. Fetch-Invalidate reply message to P Block a Requested by p Total of 3 messages Processor Q Processor Q sends data reply to p Private Cache Q invalidates its copy of block A Block a is then modified by p 2021/22 计算机体系结构Write Miss to a Block in Modified State 2021/2/2 计算机体系结构 14