2 # Architectures that offer an FTRACE implementation should select HAVE_FTRACE:
12 bool "Kernel Function Tracer"
13 depends on DEBUG_KERNEL && HAVE_FTRACE
16 select CONTEXT_SWITCH_TRACER
18 Enable the kernel to trace every kernel function. This is done
19 by using a compiler feature to insert a small, 5-byte No-Operation
20 instruction to the beginning of every kernel function, which NOP
21 sequence is then dynamically patched into a tracer call when
22 tracing is enabled by the administrator. If it's runtime disabled
23 (the bootup default), then the overhead of the instructions is very
24 small and not measurable even in micro-benchmarks.
26 config CONTEXT_SWITCH_TRACER
27 bool "Trace process context switches"
28 depends on DEBUG_KERNEL
32 This tracer gets called from the context switch and records
33 all switching of tasks.