The Role of Performance Management (PM)
Each IBA device is required to implement a PMA and a minimum set of performance monitoring and error monitoring registers (implemented as PM class attributes). In addition, the specification also defines a set of optional attributes (i.e., registers) permitting the monitoring of additional performance and error counters.
The PM is tasked with retrieving performance and error-related information from these registers. It does this by issuing PM GMP request MADs to a device's PMA. The PMA executes the method on the attribute and, in most cases, returns a result to the PM.
The PM can detect incipient failures (i.e., repetitive soft failures that may become hard failures) and can perform performance analysis. ...
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