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From: Petr Mladek <pmladek@suse.com>
To: Chris Down <chris@chrisdown.name>
Cc: linux-kernel@vger.kernel.org,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Sergey Senozhatsky <senozhatsky@chromium.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	John Ogness <john.ogness@linutronix.de>,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	Tony Lindgren <tony.lindgren@linux.intel.com>,
	kernel-team@fb.com
Subject: Re: [PATCH v8 19/21] printk: docs: Add comprehensive guidance for per-console loglevels
Date: Fri, 12 Dec 2025 16:32:15 +0100	[thread overview]
Message-ID: <aTw1f0WG43Yh0pJK@pathway> (raw)
In-Reply-To: <23043698a820da6e5a50e7ebaef8f7422d8ff471.1764272407.git.chris@chrisdown.name>

On Fri 2025-11-28 03:44:29, Chris Down wrote:
> The per-console loglevel feature documentation could use some practical
> guidance. This commit adds:
> 
> - Examples section covering runtime configuration, effective loglevel
>   checking, and boot-time configuration
> - Common use case demonstrating high-performance netconsole with quiet
>   serial console fallback
> - Performance impact section explaining how per-console loglevels reduce
>   latency by filtering messages before slow console writes
> - Edge cases section documenting behavior with concurrent writes,
>   console unregistration, and global loglevel changes
> 
> The guidance interleaves advice about many parts of this patchset, so
> let's have it in a distinct commit.
> 
> This documentation will help users understand how to effectively use and
> debug per-console loglevels.
> 
> Signed-off-by: Chris Down <chris@chrisdown.name>

I like this. Thanks for writing so extensive documentation:

Reviewed-by: Petr Mladek <pmladek@suse.com>

Best Regards,
Petr

  reply	other threads:[~2025-12-12 15:32 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-11-27 19:43 [PATCH v8 00/21] printk: console: Per-console loglevels Chris Down
2025-11-27 19:43 ` [PATCH v8 01/21] printk: Fully resolve loglevel before deciding printk delay suppression Chris Down
2025-12-09 16:40   ` Petr Mladek
2025-12-11 14:49     ` Petr Mladek
2025-12-11 15:28       ` Petr Mladek
2025-11-27 19:43 ` [PATCH v8 02/21] printk: Avoid spuriously delaying messages not solicited by any console Chris Down
2025-11-27 19:43 ` [PATCH v8 03/21] printk: Prioritise user-specified configuration over SPCR/DT Chris Down
2025-12-10 14:38   ` Petr Mladek
2025-11-27 19:43 ` [PATCH v8 04/21] printk: Use effective loglevel for suppression and extended console state Chris Down
2025-11-27 19:43 ` [PATCH v8 05/21] printk: console: Add per-console loglevel support to struct console Chris Down
2025-11-27 19:43 ` [PATCH v8 06/21] printk: nbcon: Synchronise console unregistration against atomic flushers Chris Down
2025-12-10 15:12   ` Petr Mladek
2025-11-27 19:43 ` [PATCH v8 07/21] printk: Introduce per-console loglevel support Chris Down
2025-11-27 19:43 ` [PATCH v8 08/21] printk: Iterate registered consoles for delay suppression decisions Chris Down
2025-11-27 19:43 ` [PATCH v8 09/21] printk: Optimise printk_delay() to avoid walking consoles under SRCU Chris Down
2025-12-11 14:37   ` Petr Mladek
2025-11-27 19:43 ` [PATCH v8 10/21] printk: Add synchronisation for concurrent console state changes Chris Down
2025-11-27 19:43 ` [PATCH v8 11/21] printk: Add ignore_per_console_loglevel module parameter Chris Down
2025-11-27 19:43 ` [PATCH v8 12/21] printk: Ensure sysrq output bypasses per-console filtering Chris Down
2025-11-27 19:44 ` [PATCH v8 13/21] printk: Toggle ignore_per_console_loglevel via syslog Chris Down
2025-11-27 19:44 ` [PATCH v8 14/21] printk: console: Introduce sysfs interface for per-console loglevels Chris Down
2025-12-12 14:04   ` Petr Mladek
2025-11-27 19:44 ` [PATCH v8 15/21] printk: sysrq: Clamp console loglevel to valid range Chris Down
2025-12-12 14:10   ` Petr Mladek
2025-11-27 19:44 ` [PATCH v8 16/21] printk: Constrain hardware-addressed console checks to name position Chris Down
2025-11-27 19:44 ` [PATCH v8 17/21] printk: Support setting initial console loglevel via console= on cmdline Chris Down
2025-11-27 19:44 ` [PATCH v8 18/21] printk: Deconstruct kernel.printk into discrete sysctl controls Chris Down
2025-12-12 15:24   ` Petr Mladek
2025-12-15 10:08     ` Joel Granados
2025-12-15 16:09       ` Petr Mladek
2025-11-27 19:44 ` [PATCH v8 19/21] printk: docs: Add comprehensive guidance for per-console loglevels Chris Down
2025-12-12 15:32   ` Petr Mladek [this message]
2025-11-27 19:44 ` [PATCH v8 20/21] printk: Deprecate the kernel.printk sysctl interface Chris Down
2025-12-12 15:51   ` Petr Mladek
2025-12-15  9:52     ` Joel Granados
2025-12-15 16:06       ` Petr Mladek
2025-12-17 11:47         ` Joel Granados
2025-12-17 14:33           ` Geert Uytterhoeven
2025-12-17 16:04             ` Steven Rostedt
2025-12-17 20:23               ` Joel Granados
2025-11-27 19:44 ` [PATCH v8 21/21] printk: Purge default_console_loglevel Chris Down
2025-12-12 16:11 ` [PATCH v8 00/21] printk: console: Per-console loglevels Petr Mladek

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