linux-kernel - Re: [PATCH v2 0/3] printk: replace ringbuffer

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Message-ID: <8981615b-314a-1e55-1635-d17e3cbc544e@redhat.com>
Date:   Wed, 13 May 2020 08:05:00 -0400
From:   Prarit Bhargava <prarit@...hat.com>
To:     John Ogness <john.ogness@...utronix.de>,
        Petr Mladek <pmladek@...e.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrea Parri <parri.andrea@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        kexec@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/3] printk: replace ringbuffer



On 5/1/20 5:40 AM, John Ogness wrote:
> Hello,
> 
> Here is a v2 for the first series to rework the printk subsystem. The
> v1 and history are here [0]. This first series only replaces the
> existing ringbuffer implementation. No locking is removed. No
> semantics/behavior of printk are changed.
> 
> The VMCOREINFO is updated. RFC patches for the external tools
> crash(8) [1] and makedumpfile(8) [2] have been submitted that allow
> the new ringbuffer to be correctly read.
> 
> This series is in line with the agreements [3] made at the meeting
> during LPC2019 in Lisbon, with 1 exception: support for dictionaries
> will not be discontinued [4]. Dictionaries are stored in a separate
> buffer so that they cannot interfere with the human-readable buffer.
> 

Hey John,

I tested this on two 128-cpu ppc64le power8 boxes, and a 64 core x86_64 box
using your prb-test testsuite with the latest upstream kernel.  The tests ran
successfully for ~16 hours without any problems.

P.