linux-kernel - Re: [RFC V2] printk: add warning while drop partial text in msg

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Message-ID: <20170930031434.GA490@tigerII.localdomain>
Date:   Sat, 30 Sep 2017 12:14:34 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     pierre kuo <vichy.kuo@...il.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        rostedt@...dmis.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC V2] printk: add warning while drop partial text in msg

On (09/27/17 21:59), pierre kuo wrote:
[..]
> We use the example in this mail since we try to collect the message at
> different places in our driver.
> And batch to printk for saving individual output time and group
> message together.

I see. well, printk batching (buffered mode) is a bit tricky and we
don't have it, nor we recommend it. the main problem - you lose your
data on panic. it seems to me, that the only way to do it is to re-use
printk-safe buffer on that particular CPU. but it comes at a price and
in general is a bit ugly.

	-ss