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The fbt driver is a DTrace dynamic tracing provider that performs dynamic instrumentation at function boundaries in the kernel.
The function is the fundamental unit of program text. In a well-designed system, the function performs a discrete and well-defined operation on a specified object or series of like objects. Most functions are implemented by themselves calling functions on encapsulated objects, but some functions \(emso-called "leaf functions" \(em are implemented without making further function calls. The Function Boundary Tracing fbt provider contains a mechanism for instrumenting the vast majority of functions in the kernel and offering the instrumentation as a set of DTrace probes.
The fbt driver is not a public interface and you access the instrumentation offered by this provider through DTrace. Refer to the Dynamic Tracing Guide for a description of the public documented interfaces available for the DTrace facility and the probes offered by the fbt provider.
See attributes(7) for a description of the following attributes:
| ATTRIBUTE TYPE ATTRIBUTE VALUE |
| Interface Stability Private |
dtrace (4D), attributes (7), dtrace (8)
Dynamic Tracing Guide:
https://illumos.org/books/dtrace/