Accelerated recovery for snooped addresses in a coherent attached processor proxy
US8990513B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 11, 2013 |
| Grant date | Mar 24, 2015 |
| Priority date | — |
| Expiry date | Jun 13, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2212/621
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A coherent attached processor proxy (CAPP) that participates in coherence communication in a primary coherent system on behalf of an external attached processor maintains, in each of a plurality of entries of a CAPP directory, information regarding a respective associated cache line of data from the primary coherent system cached by the attached processor. In response to initiation of recovery operations, the CAPP transmits, in a generally sequential order with respect to the CAPP directory, multiple memory access requests indicating an error for addresses indicated by the plurality of entries. In response to a snooped memory access request that targets a particular address hitting in the CAPP directory during the transmitting, the CAPP performs a coherence recovery operation for the particular address prior to a time indicated by the generally sequential order.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.