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| author | Ingo Molnar <mingo@elte.hu> | 2008-10-14 14:15:43 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-10-14 14:15:43 +0200 |
| commit | 4519d9e54dcd273975ad0adebad2a08c20428029 (patch) | |
| tree | b106b3a33908d2ca91c80efa54b60d9b1bd87df9 /kernel/trace/Kconfig | |
| parent | 07d1890420cce95c577736e4d67f70cbd39845fe (diff) | |
| download | lwn-4519d9e54dcd273975ad0adebad2a08c20428029.tar.gz lwn-4519d9e54dcd273975ad0adebad2a08c20428029.zip | |
tracing/stacktrace: improve help text
Improve the help text that is displayed for CONFIG_STACK_TRACER.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/trace/Kconfig')
| -rw-r--r-- | kernel/trace/Kconfig | 13 |
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" |