The following Profiler information provides a view on how trace items have been put together to produce a functional combination of measurement software.
Figure 1 gives an overview of the practical instrumentation in use within the Performance Investigator Tool. As shown, the low-level functionality has been encapsulated to a LDD (Logical Device Driver), which is able to perform under a supervisor mode with kernel privileges. In Figure 2, the data flow is represented by a dashed line, and the control flow with a solid line. Active elements that perform processing (processes and interrupts) are indicated in grey and passive elements (software components) in white.
Figure 1. Conceptual model of the thread level load analysis instrumentation
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