linux-kernel - Re: [PATCH printk v2 1/3] printk: move printk

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Message-ID: <20200921092803.GG14605@alley>
Date:   Mon, 21 Sep 2020 11:28:03 +0200
From:   Petr Mladek <pmladek@...e.com>
To:     John Ogness <john.ogness@...utronix.de>
Cc:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        kexec@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH printk v2 1/3] printk: move printk_info into separate
 array

On Sat 2020-09-19 00:40:19, John Ogness wrote:
> The majority of the size of a descriptor is taken up by meta data,
> which is often not of interest to the ringbuffer (for example,
> when performing state checks). Since descriptors are often
> temporarily stored on the stack, keeping their size minimal will
> help reduce stack pressure.
> 
> Rather than embedding the printk_info into the descriptor, create
> a separate printk_info array. The index of a descriptor in the
> descriptor array corresponds to the printk_info with the same
> index in the printk_info array. The rules for validity of a
> printk_info match the existing rules for the data blocks: the
> descriptor must be in a consistent state.
> 
> Signed-off-by: John Ogness <john.ogness@...utronix.de>

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

Best Regards,
Petr