Managing cache coherency in a data processing apparatus
US7937535B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 2007 |
| Grant date | May 3, 2011 |
| Priority date | — |
| Expiry date | Mar 4, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D10/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Each of plural processing units has a cache, and each cache has indication circuitry containing segment filtering data. The indication circuitry responds to an address specified by an access request from an associated processing unit to reference the segment filtering data to indicate whether the data is either definitely not stored or is potentially stored in that segment. Cache coherency circuitry ensures that data accessed by each processing unit is up-to-date and has snoop indication circuitry whose content is derived from the already-provided segment filtering data. For certain access requests, the cache coherency circuitry initiates a coherency operation during which the snoop indication circuitry determines whether any of the caches requires a snoop operation. For each cache that does, the cache coherency circuitry issues a notification to that cache identifying the snoop operation to be performed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.