linux-kernel - Re: [PATCH printk v5 7/8] printk: use printk

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Message-ID: <Y7wja2TrMrT4qGyU@alley>
Date:   Mon, 9 Jan 2023 15:23:39 +0100
From:   Petr Mladek <pmladek@...e.com>
To:     John Ogness <john.ogness@...utronix.de>
Cc:     Sergey Senozhatsky <senozhatsky@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH printk v5 7/8] printk: use printk_buffers for devkmsg

On Mon 2023-01-09 11:13:59, John Ogness wrote:
> Replace the buffers in struct devkmsg_user with a struct
> printk_buffers. This reduces the number of buffers to keep track of.
> 
> As a side-effect, @text_buf was 8kB large, even though it only
> needed to be the max size of a ringbuffer record. By switching to
> struct printk_buffers, ~7kB less memory is allocated when opening
> /dev/kmsg.
> 
> And since struct printk_buffers will be used now, reduce duplicate
> code by calling printk_get_next_message() to handle the record
> reading and formatting.
> 
> Note that since /dev/kmsg never suppresses records based on
> loglevel, printk_get_next_message() is extended with an extra
> bool argument to specify if suppression is allowed.
> 
> Signed-off-by: John Ogness <john.ogness@...utronix.de>

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

Best Regards,
Petr