1 files changed, 13 insertions, 0 deletions

diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index ce70677afbf9..1399f372b5dc 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -8,3 +8,16 @@ 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.