tracing/stacktrace: improve help text
Improve the help text that is displayed for CONFIG_STACK_TRACER.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 396aea1..11fd03a 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -141,8 +141,17 @@
select FTRACE
select STACKTRACE
help
- This tracer records the max stack of the kernel, and displays
- it in debugfs/tracing/stack_trace
+ This special tracer records the maximum stack footprint of the
+ kernel and displays it in debugfs/tracing/stack_trace.
+
+ This tracer works by hooking into every function call that the
+ kernel executes, and keeping a maximum stack depth value and
+ stack-trace saved. Because this logic has to execute in every
+ kernel function, all the time, this option can slow down the
+ kernel measurably and is generally intended for kernel
+ developers only.
+
+ Say N if unsure.
config DYNAMIC_FTRACE
bool "enable/disable ftrace tracepoints dynamically"