linux-kernel - Re: [PATCH V5 06/16] Documentation/rv: Add a basic documentation

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Date:   Sun, 17 Jul 2022 23:19:19 +0800
From:   Tao Zhou <tao.zhou@...ux.dev>
To:     Daniel Bristot de Oliveira <bristot@...nel.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Jonathan Corbet <corbet@....net>,
        Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Marco Elver <elver@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Gabriele Paoloni <gpaoloni@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Clark Williams <williams@...hat.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-trace-devel@...r.kernel.org
Subject: Re: [PATCH V5 06/16] Documentation/rv: Add a basic documentation

On Wed, Jul 13, 2022 at 11:17:22PM +0200, Daniel Bristot de Oliveira wrote:
> Add the runtime-verification.rst document, explaining the basics of RV
> and how to use the interface.
> 
> Cc: Wim Van Sebroeck <wim@...ux-watchdog.org>
> Cc: Guenter Roeck <linux@...ck-us.net>
> Cc: Jonathan Corbet <corbet@....net>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Will Deacon <will@...nel.org>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Marco Elver <elver@...gle.com>
> Cc: Dmitry Vyukov <dvyukov@...gle.com>
> Cc: "Paul E. McKenney" <paulmck@...nel.org>
> Cc: Shuah Khan <skhan@...uxfoundation.org>
> Cc: Gabriele Paoloni <gpaoloni@...hat.com>
> Cc: Juri Lelli <juri.lelli@...hat.com>
> Cc: Clark Williams <williams@...hat.com>
> Cc: Tao Zhou <tao.zhou@...ux.dev>
> Cc: Randy Dunlap <rdunlap@...radead.org>
> Cc: linux-doc@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Cc: linux-trace-devel@...r.kernel.org
> Signed-off-by: Daniel Bristot de Oliveira <bristot@...nel.org>
> ---
>  Documentation/trace/index.rst                 |   1 +
>  Documentation/trace/rv/index.rst              |   9 +
>  .../trace/rv/runtime-verification.rst         | 233 ++++++++++++++++++
>  kernel/trace/rv/Kconfig                       |   3 +
>  kernel/trace/rv/rv.c                          |   3 +
>  5 files changed, 249 insertions(+)
>  create mode 100644 Documentation/trace/rv/index.rst
>  create mode 100644 Documentation/trace/rv/runtime-verification.rst
> +   runtime-verification.rst

[snip]

> +The user interface
> +==================
> +
> +The user interface resembles the tracing interface (on purpose). It is
> +currently at "/sys/kernel/tracing/rv/".
> +
> +The following files/folders are currently available:
> +
> +**available_monitors**
> +
> +- Reading list the available monitors, one per line
> +
> +For example::
> +
> +   # cat available_monitors
> +   wip
> +   wwnr
> +
> +**available_reactors**
> +
> +- Reading shows the available reactors, one per line.
> +
> +For example::
> +
> +   # cat available_reactors
> +   nop
> +   panic
> +   printk
> +
> +**enabled_monitors**:
> +
> +- Reading lists the enabled monitors, one per line
> +- Writing to it enables a given monitor
> +- Writing a monitor name with a '-' prefix disables it

s/-/!/

> +- Truncating the file disables all enabled monitors
> +
> +For example::
> +
> +   # cat enabled_monitors
> +   # echo wip > enabled_monitors
> +   # echo wwnr >> enabled_monitors
> +   # cat enabled_monitors
> +   wip
> +   wwnr
> +   # echo '!wip' >> enabled_monitors
> +   # cat enabled_monitors
> +   wwnr
> +   # echo > enabled_monitors
> +   # cat enabled_monitors
> +   #
> +
> +Note that it is possible to enable more than one monitor concurrently.
> +
> +
> +**monitoring_on**
> +
> +This is an on/off general switcher for monitoring. It resembles the
> +"tracing_on" switcher in the trace interface.
> +
> +- Writing "0" stops the monitoring
> +- Writing "1" continues the monitoring
> +- Reading returns the current status of the monitoring
> +
> +Note that it does not disable enabled monitors but stop the per-entity
> +monitors monitoring the events received from the system.
> +
> +**reacting_on**
> +
> +- Writing "0" prevents reactions for happening
> +- Writing "1" enable reactions
> +- Reading returns the current status of the monitoring

s/monitoring/reaction/