From: John Ogness <john.ogness@linutronix.de>
To: Sreenath Vijayan <sreenath.vijayan@sony.com>,
pmladek@suse.com, corbet@lwn.net, gregkh@linuxfoundation.org,
jirislaby@kernel.org
Cc: rdunlap@infradead.org, rostedt@goodmis.org,
senozhatsky@chromium.org, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org,
taichi.shimoyashiki@sony.com, daniel.palmer@sony.com,
anandakumar.balasubramaniam@sony.com, sreenath.vijayan@sony.com
Subject: Re: [PATCH v5 1/2] printk: Add function to replay kernel log on consoles
Date: Thu, 07 Mar 2024 14:59:36 +0106 [thread overview]
Message-ID: <87zfva87xb.fsf@jogness.linutronix.de> (raw)
In-Reply-To: <7ca188a59ef016c7730031c10f072d478434c04a.1709277332.git.sreenath.vijayan@sony.com>
On 2024-03-07, Sreenath Vijayan <sreenath.vijayan@sony.com> wrote:
> Add a generic function console_replay_all() for replaying
> the kernel log on consoles, in any context. It would allow
> viewing the logs on an unresponsive terminal via sysrq.
>
> Reuse the existing code from console_flush_on_panic() for
> resetting the sequence numbers, by introducing a new helper
> function __console_rewind_all(). It is safe to be called
> under console_lock().
>
> Try to acquire lock on the console subsystem without waiting.
> If successful, reset the sequence number to oldest available
> record on all consoles and call console_unlock() which will
> automatically flush the messages to the consoles.
>
> Suggested-by: John Ogness <john.ogness@linutronix.de>
> Suggested-by: Petr Mladek <pmladek@suse.com>
> Signed-off-by: Sreenath Vijayan <sreenath.vijayan@sony.com>
> Signed-off-by: Shimoyashiki Taichi <taichi.shimoyashiki@sony.com>
Reviewed-by: John Ogness <john.ogness@linutronix.de>
next prev parent reply other threads:[~2024-03-07 13:54 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-07 12:49 [PATCH v5 0/2] Add support to replay kernel log on console via sysrq Sreenath Vijayan
2024-03-07 12:55 ` [PATCH v5 1/2] printk: Add function to replay kernel log on consoles Sreenath Vijayan
2024-03-07 13:53 ` John Ogness [this message]
2024-03-07 12:59 ` [PATCH v5 2/2] tty/sysrq: Replay kernel log messages on consoles via sysrq Sreenath Vijayan
2024-03-07 14:00 ` John Ogness
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