Patent · US Active

Method for executing atomic memory operations when contested

US11467962B2 · kind B2 · utility

0Cited by

4References

15Claims

0Family size

Assignee

SiFive, Inc. · US

Inventors

John Ingalls · Sunnyvale, US
Wesley Waylon Terpstra · San Mateo, US
Henry Cook · Berkeley, US
Leigang Kou · Austin, US

Key dates

Filing date	Sep 2, 2020
Grant date	Oct 11, 2022
Priority date	—
Expiry date	Sep 26, 2040

Classification

Technology area (CPC G)Physics
CPC primaryG06F2212/1024
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

Described are methods and a system for atomic memory operations with contended cache lines. A processing system includes at least two cores, each core having a local cache, and a lower level cache in communication with each local cache. One local cache configured to request a cache line to execute an atomic memory operation (AMO) instruction, receive the cache line via the lower level cache, receive a probe downgrade due to other local cache requesting the cache line prior to execution of the AMO, and send the AMO instruction to the lower level cache for remote execution in response to the probe downgrade.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.