linux-kernel - Re: [PATCH v2 1/2] RDMA/rxe: Improve newline in printing messages

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Date:   Mon, 28 Aug 2023 20:15:15 +0800
From:   Zhu Yanjun <zyjzyj2000@...il.com>
To:     John Ogness <john.ogness@...utronix.de>
Cc:     Zhu Yanjun <yanjun.zhu@...ux.dev>,
        Li Zhijian <lizhijian@...itsu.com>, linux-rdma@...r.kernel.org,
        "pmladek@...e.com" <pmladek@...e.com>,
        "senozhatsky@...omium.org" <senozhatsky@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>, jgg@...pe.ca,
        leon@...nel.org, linux-kernel@...r.kernel.org,
        rpearsonhpe@...il.com,
        Daisuke Matsuda <matsuda-daisuke@...itsu.com>
Subject: Re: [PATCH v2 1/2] RDMA/rxe: Improve newline in printing messages

Very helpful. Thanks a lot for your explanation.

Zhu Yanjun

On Mon, Aug 28, 2023 at 6:51 PM John Ogness <john.ogness@...utronix.de> wrote:
>
> On 2023-08-28, Zhu Yanjun <zyjzyj2000@...il.com> wrote:
> > Do you mean "a newline can help flushing messages out"?
> > That is, in printk, the message will be buffered until it is full or
> > it meets a newline?
>
> Correct. A trailing newline is needed for the record to become
> "finalized". Only finalized records are pushed out to consoles.
>
> If there is no trailing newline, the message will be buffered until
> printk is called using a message with a trailing newline.
>
> There are some other reasons why it may be flushed. But for sure the
> flushing will be delayed if there is no trailing newline.
>
> John Ogness