linux-kernel - Re: [PATCH] docs: kernel: Clarify printk_ratelimit

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <a8549ecf-5cad-415d-81a3-21ffc39e6c4b@paulmck-laptop>
Date: Wed, 16 Jul 2025 15:49:06 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: Breno Leitao <leitao@...ian.org>
Cc: Jonathan Corbet <corbet@....net>, pmladek@...e.com, rostedt@...dmis.org,
	john.ogness@...utronix.de, senozhatsky@...omium.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] docs: kernel: Clarify printk_ratelimit_burst reset
 behavior

On Mon, Jul 14, 2025 at 05:06:27AM -0700, Breno Leitao wrote:
> Add clarification that the printk_ratelimit_burst window resets after
> printk_ratelimit seconds have elapsed, allowing another burst of
> messages to be sent. This helps users understand that the rate limiting
> is not permanent but operates in periodic windows.
> 
> Signed-off-by: Breno Leitao <leitao@...ian.org>

Reviewed-by: Paul E. McKenney <paulmck@...nel.org>

> ---
>  Documentation/admin-guide/sysctl/kernel.rst | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst
> index a43b78b4b6464..6f8d3935147da 100644
> --- a/Documentation/admin-guide/sysctl/kernel.rst
> +++ b/Documentation/admin-guide/sysctl/kernel.rst
> @@ -1099,7 +1099,8 @@ printk_ratelimit_burst
>  While long term we enforce one message per `printk_ratelimit`_
>  seconds, we do allow a burst of messages to pass through.
>  ``printk_ratelimit_burst`` specifies the number of messages we can
> -send before ratelimiting kicks in.
> +send before ratelimiting kicks in.  After `printk_ratelimit`_ seconds
> +have elapsed, another burst of messages may be sent.
>  
>  The default value is 10 messages.
>  
> 
> ---
> base-commit: 0907e7fb35756464aa34c35d6abb02998418164b
> change-id: 20250714-docs_ratelimit-8f4a30f29908
> 
> Best regards,
> --  
> Breno Leitao <leitao@...ian.org>
>