linux-kernel - Re: [PATCH] tty/sysrq: Dump kernel ring buffer messages via sysrq

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Date: Thu, 21 Dec 2023 17:52:55 +0100
From: Greg KH <gregkh@...uxfoundation.org>
To: Sreenath Vijayan <sreenath.vijayan@...y.com>
Cc: linux-doc@...r.kernel.org, linux-serial@...r.kernel.org, corbet@....net,
	jirislaby@...nel.org, linux-kernel@...r.kernel.org,
	anandakumar.balasubramaniam@...y.com,
	Shimoyashiki Taichi <taichi.shimoyashiki@...y.com>
Subject: Re: [PATCH] tty/sysrq: Dump kernel ring buffer messages via sysrq

On Thu, Dec 21, 2023 at 07:09:53PM +0530, Sreenath Vijayan wrote:
> When terminal is unresponsive, one cannot use dmesg to view kernel
> ring buffer messages. Also, syslog services may be disabled,
> to check them after a reboot, especially on embedded systems.
> In this scenario, dump the kernel ring buffer messages via sysrq
> by pressing sysrq+D.
> 
> Signed-off-by: Sreenath Vijayan <sreenath.vijayan@...y.com>
> Signed-off-by: Shimoyashiki Taichi <taichi.shimoyashiki@...y.com>
> ---
>  Documentation/admin-guide/sysrq.rst |  2 ++
>  drivers/tty/sysrq.c                 | 43 ++++++++++++++++++++++++++++-
>  2 files changed, 44 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/admin-guide/sysrq.rst b/Documentation/admin-guide/sysrq.rst
> index 2f2e5bd440f9..464c4e138b9d 100644
> --- a/Documentation/admin-guide/sysrq.rst
> +++ b/Documentation/admin-guide/sysrq.rst
> @@ -161,6 +161,8 @@ Command	    Function
>              will be printed to your console. (``0``, for example would make
>              it so that only emergency messages like PANICs or OOPSes would
>              make it to your console.)
> +
> +``D``	    Dump the kernel ring buffer
>  =========== ===================================================================

Nit, this doesn't line up anymore :(