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- #
- # Architectures that offer an FTRACE implementation should select HAVE_FTRACE:
- #
- config HAVE_FTRACE
- bool
- config TRACING
- bool
- select DEBUG_FS
- config FTRACE
- bool "Kernel Function Tracer"
- depends on DEBUG_KERNEL && HAVE_FTRACE
- select FRAME_POINTER
- select TRACING
- help
- Enable the kernel to trace every kernel function. This is done
- by using a compiler feature to insert a small, 5-byte No-Operation
- instruction to the beginning of every kernel function, which NOP
- sequence is then dynamically patched into a tracer call when
- tracing is enabled by the administrator. If it's runtime disabled
- (the bootup default), then the overhead of the instructions is very
- small and not measurable even in micro-benchmarks.
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