linux-kernel - Re: [RFC PATCH v4 0/9] printk: new ringbuffer implementation

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Date:   Thu, 05 Sep 2019 23:10:34 +0200
From:   John Ogness <john.ogness@...utronix.de>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Petr Mladek <pmladek@...e.com>,
        Andrea Parri <andrea.parri@...rulasolutions.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Brendan Higgins <brendanhiggins@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org,
        "contact\@linuxplumbersconf.org" <contact@...uxplumbersconf.org>,
        Theodore Ts'o <tytso@....edu>
Subject: Re: [RFC PATCH v4 0/9] printk: new ringbuffer implementation

On 2019-09-05, Steven Rostedt <rostedt@...dmis.org> wrote:
>>> But per the above argument of needing the CPU serialization
>>> _anyway_, I don't see a compelling reason not to use it.
>>> 
>>> It is simple, it works. Let's use it.
>>> 
>>> If you really fancy a multi-writer buffer, you can always switch to
>>> one later, if you can convince someone it actually brings benefits
>>> and not just head-aches.
>> 
>> Can we please grab one of the TBD slots at kernel summit next week,
>> sit down in a room and hash that out?
>>
>
> We should definitely be able to find a room that will be available
> next week.

FWIW, on Monday at 12:45 I am giving a talk[0] on the printk
rework. I'll be dedicating a few slides to presenting the lockless
multi-writer design, but will also talk about the serialized CPU
approach from RFCv1.

John Ogness

[0] https://www.linuxplumbersconf.org/event/4/contributions/290/