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

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Message-Id: <20201208082649.93bdd57eb397296c81baf64c@kernel.org>
Date:   Tue, 8 Dec 2020 08:26:49 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>
Subject: Re: Ftrace startup test and boot-time tracing

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.

Thank you,
-- 
Masami Hiramatsu <mhiramat@...nel.org>