linux-kernel - Re: Would you help to tell why async printk solution was not taken to upstream kernel ?

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Date:   Mon, 5 Mar 2018 22:16:44 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc:     "Qixuan.Wu" <qixuan.wu@...ux.alibaba.com>,
        linux-kernel-owner <linux-kernel-owner@...r.kernel.org>,
        Petr Mladek <pmladek@...e.com>, Jan Kara <jack@...e.cz>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        "chenggang.qin" <chenggang.qin@...ux.alibaba.com>,
        caijingxian <caijingxian@...ux.alibaba.com>,
        "yuanliang.wyl" <yuanliang.wyl@...baba-inc.com>
Subject: Re: Would you help to tell why async printk solution was not taken
 to upstream kernel ?

On Tue, 6 Mar 2018 11:53:50 +0900
Sergey Senozhatsky <sergey.senozhatsky.work@...il.com> wrote:


> Yes. My point was that "CPU can print one full buffer max" is not
> guaranteed and not exactly true. There are ways for CPUs to break
> that O(logbuf) boundary.

Yes, when printk or the consoles have a bug, it can be greater than
O(logbuf).

-- Steve