tracing/stacktrace: improve help text

Improve the help text that is displayed for CONFIG_STACK_TRACER.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 11 insertions, 2 deletions

diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 396aea11398e..11fd03a429f0 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -141,8 +141,17 @@ config STACK_TRACER
         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"