From: Petr Mladek <pmladek@suse.com>
To: John Ogness <john.ogness@linutronix.de>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>,
Steven Rostedt <rostedt@goodmis.org>,
Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH printk v4 08/17] printk: nbcon: Use thread callback if in task context for legacy
Date: Tue, 27 Aug 2024 17:09:38 +0200 [thread overview]
Message-ID: <Zs3sMrQCuLoPaO-z@pathway.suse.cz> (raw)
In-Reply-To: <20240827044333.88596-9-john.ogness@linutronix.de>
On Tue 2024-08-27 06:49:24, John Ogness wrote:
> When printing via console_lock, the write_atomic() callback is
> used for nbcon consoles. However, if it is known that the
> current context is a task context, the write_thread() callback
> can be used instead.
>
> Using write_thread() instead of write_atomic() helps to reduce
> large disabled preemption regions when the device_lock does not
> disable preemption.
>
> This is mainly a preparatory change to allow avoiding
> write_atomic() completely during normal operation if boot
> consoles are registered.
>
> As a side-effect, it also allows consolidating the printing
> code for legacy printing and the kthread printer.
>
> Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Best Regards,
Petr
next prev parent reply other threads:[~2024-08-27 15:09 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-08-27 4:43 [PATCH printk v4 00/17] add threaded printing + the rest John Ogness
2024-08-27 4:43 ` [PATCH printk v4 01/17] printk: nbcon: Add function for printers to reacquire ownership John Ogness
2024-08-27 11:57 ` Petr Mladek
2024-08-27 4:43 ` [PATCH printk v4 02/17] printk: Fail pr_flush() if before SYSTEM_SCHEDULING John Ogness
2024-08-27 12:00 ` Petr Mladek
2024-08-27 4:43 ` [PATCH printk v4 03/17] printk: Flush console on unregister_console() John Ogness
2024-08-27 4:43 ` [PATCH printk v4 04/17] printk: nbcon: Add context to usable() and emit() John Ogness
2024-08-27 12:21 ` Petr Mladek
2024-08-27 4:43 ` [PATCH printk v4 05/17] printk: nbcon: Init @nbcon_seq to highest possible John Ogness
2024-08-27 12:29 ` Petr Mladek
2024-08-27 4:43 ` [PATCH printk v4 06/17] printk: nbcon: Introduce printer kthreads John Ogness
2024-08-27 14:48 ` Petr Mladek
2024-08-28 17:33 ` John Ogness
2024-08-27 4:43 ` [PATCH printk v4 07/17] printk: nbcon: Relocate nbcon_atomic_emit_one() John Ogness
2024-08-27 14:50 ` Petr Mladek
2024-08-27 4:43 ` [PATCH printk v4 08/17] printk: nbcon: Use thread callback if in task context for legacy John Ogness
2024-08-27 15:09 ` Petr Mladek [this message]
2024-08-27 4:43 ` [PATCH printk v4 09/17] printk: nbcon: Rely on kthreads for normal operation John Ogness
2024-08-27 15:50 ` Petr Mladek
2024-08-27 21:13 ` John Ogness
2024-08-27 4:43 ` [PATCH printk v4 10/17] printk: Provide helper for message prepending John Ogness
2024-08-27 4:43 ` [PATCH printk v4 11/17] printk: nbcon: Show replay message on takeover John Ogness
2024-08-27 4:43 ` [PATCH printk v4 12/17] proc: consoles: Add notation to c_start/c_stop John Ogness
2024-08-27 4:43 ` [PATCH printk v4 13/17] proc: Add nbcon support for /proc/consoles John Ogness
2024-08-27 4:43 ` [PATCH printk v4 14/17] tty: sysfs: Add nbcon support for 'active' John Ogness
2024-08-27 4:43 ` [PATCH printk v4 15/17] printk: Implement legacy printer kthread for PREEMPT_RT John Ogness
2024-08-27 4:43 ` [PATCH printk v4 16/17] printk: nbcon: Assign nice -20 for printing threads John Ogness
2024-08-27 4:43 ` [PATCH printk v4 17/17] printk: Avoid false positive lockdep report for legacy printing John Ogness
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=Zs3sMrQCuLoPaO-z@pathway.suse.cz \
--to=pmladek@suse.com \
--cc=john.ogness@linutronix.de \
--cc=linux-kernel@vger.kernel.org \
--cc=rostedt@goodmis.org \
--cc=senozhatsky@chromium.org \
--cc=tglx@linutronix.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox