Direct memory access in a hybrid computing environment

Details Direct memory access in a hybrid computing environment Direct memory access in a hybrid computing environment

2009-04-23

2011-10-11

Hafiz, Tariq (Department: 2182)

Electrical computers and digital data processing systems: input/

Input/output data processing

Direct memory accessing

C710S005000, C710S008000, C710S033000

Reexamination Certificate

active

08037217

ABSTRACT:
DMA in a computing environment that includes several computers and DMA engines, the computers adapted to one another for data communications by an data communications fabric, each computer executing an application, where DMA includes: pinning, by a first application, a memory region, including providing, to all applications, information describing the memory region; effecting, by a second application in dependence upon the information describing the memory region, DMA transfers related to the memory region, including issuing DMA requests to a particular DMA engine for processing; and unpinning, by the first application, the memory region, including insuring, prior to unpinning, that no additional DMA requests related to the memory region are issued, that all outstanding DMA requests related to the memory region are provided to a DMA engine, and that processing of all outstanding DMA requests related to the memory region and provided to a DMA engine has been completed.

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