linux-kernel - Re: [RFC PATCH v2 0/2] printk: new ringbuffer implementation

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Date:   Mon, 17 Jun 2019 23:09:32 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     John Ogness <john.ogness@...utronix.de>
cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrea Parri <andrea.parri@...rulasolutions.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: Re: [RFC PATCH v2 0/2] printk: new ringbuffer implementation

On Fri, 7 Jun 2019, John Ogness wrote:

Polite ping ....

> This is a follow-up RFC on the work to reimplement much of
> the core of printk. The original thread can be seen here[0].
> 
> One of the results of that thread was that the work needs to
> be broken up into several pieces. A roadmap was laid out[1]
> and this RFC is for the base component of the first piece:
> a new ringbuffer implementation for printk.
> 
> This series does not touch any existing printk code. It is
> only the ringbuffer implementation. I am particularly
> interested in feedback relating to the design of the
> ringbuffer and the use of memory barriers.
> 
> The series also includes a test module that performs some
> heavy writer stress testing. I have successfully run these
> tests on a 16-core ARM64 platform.
> 
> John Ogness
> 
> [0] https://lkml.kernel.org/r/20190212143003.48446-1-john.ogness@linutronix.de
> [1] https://lkml.kernel.org/r/87y35hn6ih.fsf@linutronix.de
> 
> John Ogness (2):
>   printk-rb: add a new printk ringbuffer implementation
>   printk-rb: add test module
> 
>  Documentation/core-api/index.rst             |   1 +
>  Documentation/core-api/printk-ringbuffer.rst | 104 +++
>  include/linux/printk_ringbuffer.h            | 238 +++++++
>  lib/Makefile                                 |   2 +
>  lib/printk_ringbuffer.c                      | 924 +++++++++++++++++++++++++++
>  lib/test_prb.c                               | 237 +++++++
>  6 files changed, 1506 insertions(+)
>  create mode 100644 Documentation/core-api/printk-ringbuffer.rst
>  create mode 100644 include/linux/printk_ringbuffer.h
>  create mode 100644 lib/printk_ringbuffer.c
>  create mode 100644 lib/test_prb.c
> 
> -- 
> 2.11.0
> 
>