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

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Date:   Fri,  7 Jun 2019 18:29:47 +0206
From:   John Ogness <john.ogness@...utronix.de>
To:     linux-kernel@...r.kernel.org
Cc:     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>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: [RFC PATCH v2 0/2] printk: new ringbuffer implementation

Hello,

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