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

[Steven Rostedt <rostedt@goodmis.org>]

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?

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

-- Steve