Re: [PATCH v4 16/17] selftests/verification: Rearrange the wwnr_printk test
Gabriele Monaco <[email protected]>
| Newsgroups | org.kernel.vger.linux-trace-kernel,org.kernel.vger.linux-kernel,org.kernel.vger.linux-kselftest |
|---|---|
| Message-ID | <[email protected]> |
On Fri, 2026-07-17 at 17:46 +0200, Gabriele Monaco wrote:
> +# loads may flood the ringbuffer, wait for all pending printks
> +wait_dmesg_flush() {
> + local last_before last_after=$(dmesg | grep "rv:" | tail -n 1 ||
> true)
> + while [ "$last_before" != "$last_after" ]; do
> + last_before=$last_after
> + sleep .3
> + last_after=$(dmesg | grep "rv:" | tail -n 1 || true)
> + done
> }
>
> echo 1 > monitors/wwnr/enable
> echo printk > monitors/wwnr/reactors
>
> load
> +wait_dmesg_flush
On some systems this may trigger wwnr's reactions and run indefinitely, I'm
going to send a V5 moving this after turning monitoring/reacting of and adding a
timeout, just in case those switches don't work.
>
> echo 0 > monitoring_on
> ! load || false
> echo 1 > monitoring_on
>
> load
> +wait_dmesg_flush
>
> echo 0 > reacting_on
> ! load || false