linux-kernel - Re: Ftrace startup test and boot-time tracing

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Date:   Mon, 7 Dec 2020 18:38:42 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>
Subject: Re: Ftrace startup test and boot-time tracing

On Tue, 8 Dec 2020 08:26:49 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> Hi Steve,
> 
> On Mon, 7 Dec 2020 15:25:40 -0500
> Steven Rostedt <rostedt@...dmis.org> wrote:
> 
> > On Mon, 7 Dec 2020 23:02:59 +0900
> > Masami Hiramatsu <mhiramat@...nel.org> wrote:
> >   
> > > There will be the 2 options, one is to change kconfig so that user can not
> > > select FTRACE_STARTUP_TEST if BOOTTIME_TRACING=y, another is to provide
> > > a flag from trace_boot and all tests checks the flag at runtime.
> > > (moreover, that flag will be good to be set from other command-line options)
> > > What would you think?  
> > 
> > Yeah, a "disable_ftrace_startup_tests" flag should be implemented. And
> > something that could also be on the kernel command line itself :-)
> > 
> >  "disabe_ftrace_startup_tests"
> > 
> > Sometimes when debugging something, I don't want the tests running, even
> > though the config has them, and I don't want to change the config.  
> 
> OK, BTW, I found tracing_selftest_disabled, it seemed what we need.
> 

Yeah, I thought we had something like this. It's getting hard to keep track
of ;-)

-- Steve