Re: [PATCH v1 0/4] selftests/ftrace: Add a boottime tracing test framework

[Masami Hiramatsu (Google) <mhiramat@kernel.org>]

On Mon, 10 Aug 2026 10:53:00 -0400
Steven Rostedt <rostedt@goodmis.org> wrote:

> On Mon, 10 Aug 2026 18:33:45 +0900
> "Masami Hiramatsu (Google)" <mhiramat@kernel.org> wrote:
> 
> > Hi,
> > 
> > This series adds a boottime tracing test framework to selftests/ftrace.
> > This is based on v3 series[1] of the boot-time trace (via bootconfig)
> > testing script.
> > 
> > [1] https://lore.kernel.org/all/178613904128.259829.16130019979800943264.stgit@devnote2/
> > 
> > The new run_boottime_test.sh can run tests not only for boottime trace
> > but also other kernel cmdline tracing options, including persistent
> > ring buffer and its backup.
> > This makes it possible to easily detect regression bugs in the kernel
> > boot trace options.
> > 
> > Here is an example of the test output.
> > -----
> > TAP version 13
> > 1..14
> > ok 1 01-kprobe
> > ok 2 02-synth
> > ok 3 03-eprobe
> > ok 4 04-fprobe
> > ok 5 05-tprobe
> > ok 6 06-instance
> > ok 7 cmdline-01-ftrace
> > ok 8 cmdline-02-trace-event
> > ok 9 cmdline-03-trace-buf-size
> > ok 10 cmdline-04-trace-options
> > ok 11 cmdline-05-trace-clock
> > ok 12 cmdline-06-trace-instance
> > ok 13 persistent-01-reserve-mem
> > ok 14 persistent-02-backup-instance
> > # Totals: pass:14 fail:0 xfail:0 xpass:0 skip:0 error:0
> > -----
> 
> Just to understand this better. This series creates a small ramdisk and
> runs qemu on a given kernel to boot in qemu and test, right?

Yes, that's right.

> 
> Can you add the examples you have in the documentation patch to the cover
> letter. That will market more exactly what you are doing.

OK, let me update the series with the explanation.

Thank you!

> 
> -- Steve


-- 
Masami Hiramatsu (Google) <mhiramat@kernel.org>