Invention Application
- Patent Title: Coherence Directory Way Tracking in Coherent Agents
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Application No.: US18433118Application Date: 2024-02-05
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Publication No.: US20250103496A1Publication Date: 2025-03-27
- Inventor: Ilya Granovsky , Amanvir Singh Sidana , Sandeep Gupta , Tom Greenshtein , Vivek Venkatraman
- Applicant: Apple Inc.
- Applicant Address: US CA Cupertino
- Assignee: Apple Inc.
- Current Assignee: Apple Inc.
- Current Assignee Address: US CA Cupertino
- Main IPC: G06F12/0817
- IPC: G06F12/0817 ; G06F12/0891

Abstract:
An apparatus includes a plurality of coherent agents, and a coherence directory that includes directory ways for storing coherency information. The coherence directory may be configured to determine that a cache block that is not currently cached among the coherent agents, is stored in a first coherent agent. The coherence directory may be further configured to, in response to this determination, create a particular entry in a selected one of the directory ways. The coherence directory may also be configured to send, to the first coherent agent, an indicator identifying a directory way that includes the entry. In response to a second coherent agent caching the cache block, the coherence directory may update the entry to include the second coherent agent. The first and second coherent agents may be configured to receive copies of the indicator, and to store their copy in locations associated with the cache block.
Information query
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