On Fri, 6 Sep 2024 11:36:11 +0800 Zheng Yejian <[email protected]> wrote:
> On 2024/9/4 14:58, Sven Schnelle wrote: > > Add a config option to disable/enable function argument > > printing support during runtime. > > > > Signed-off-by: Sven Schnelle <[email protected]> > > --- > > kernel/trace/Kconfig | 12 ++++++++++++ > > 1 file changed, 12 insertions(+) > > > > diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig > > index 721c3b221048..8b9b6cdf39ac 100644 > > --- a/kernel/trace/Kconfig > > +++ b/kernel/trace/Kconfig > > @@ -242,6 +242,18 @@ config FUNCTION_GRAPH_RETVAL > > enable it via the trace option funcgraph-retval. > > See Documentation/trace/ftrace.rst > > > > +config FUNCTION_TRACE_ARGS > > + bool "Kernel Function Tracer Arguments" > > + depends on HAVE_FUNCTION_ARG_ACCESS_API > > + depends on DEBUG_INFO_BTF && BPF_SYSCALL > > Nice feature! > > Just a nit, DEBUG_INFO_BTF currently depends on BPF_SYSCALL, > so BPF_SYSCALL may not be necessary here. This feature > also doesn't seem to depend on bpf. Indeed. Sven, you can check the PROBE_EVENTS_BTF_ARGS as an example. config PROBE_EVENTS_BTF_ARGS depends on HAVE_FUNCTION_ARG_ACCESS_API depends on FPROBE_EVENTS || KPROBE_EVENTS depends on DEBUG_INFO_BTF && BPF_SYSCALL bool "Support BTF function arguments for probe events" Thank you, > > > + default n > > + help > > + Support recording and printing of function arguments when using > > + the function tracer or function graph tracer. This feature is off > > + by default, and can be enabled via the trace option func-args (for > > + the function tracer) and funcgraph-args (for the function graph > > + tracer). > > + > > config DYNAMIC_FTRACE > > bool "enable/disable function tracing dynamically" > > depends on FUNCTION_TRACER > > -- > Thanks, > Zheng Yejian > > -- Masami Hiramatsu (Google) <[email protected]>
