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Using DMA for copying performance counter data to memory

United States Patent

December 31, 2013
View the Complete Patent at the US Patent & Trademark Office
A device for copying performance counter data includes hardware path that connects a direct memory access (DMA) unit to a plurality of hardware performance counters and a memory device. Software prepares an injection packet for the DMA unit to perform copying, while the software can perform other tasks. In one aspect, the software that prepares the injection packet runs on a processing core other than the core that gathers the hardware performance counter data.
Gara; Alan (Mount Kisco, NY), Salapura; Valentina (Chappaqua, NY), Wisniewski; Robert W. (Ossining, NY)
International Business Machines Corporation (Armonk, NY)
13/ 446,467
April 13, 2012
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with Government support under Contract No.: B554331 awarded by Department of Energy. The Government has certain rights in this invention.