linux-kernel - Re: [RFC PATCH v1 08/25] printk: add ring buffer and kthread

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Message-ID: <20190307065106.GB425@jagdpanzerIV>
Date:   Thu, 7 Mar 2019 15:51:06 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc:     John Ogness <john.ogness@...utronix.de>,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Daniel Wang <wonderfly@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Cox <gnomes@...rguk.ukuu.org.uk>,
        Jiri Slaby <jslaby@...e.com>,
        Peter Feiner <pfeiner@...gle.com>, linux-serial@...r.kernel.org
Subject: Re: [RFC PATCH v1 08/25] printk: add ring buffer and kthread

On (03/07/19 15:41), Sergey Senozhatsky wrote:
> This sounds concerning. IMHO, netconsole is too important to rely
> on preemptible printk and scheduler. Especially those netcons which
> run in "report only when oops_in_progress" mode. Sometimes netconsole
> is the fastest console available, but preemptible printk may turn it
> into the slowest one.

+ oops may end by the time kthread becomes active.

	-ss