linux-kernel - Re: [PATCH v3 3/3] printk: use the lockless ringbuffer

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Date:   Thu, 02 Jul 2020 11:08:02 +0206
From:   John Ogness <john.ogness@...utronix.de>
To:     lijiang <lijiang@...hat.com>, 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>,
        Paul McKenney <paulmck@...nel.org>, kexec@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/3] printk: use the lockless ringbuffer

On 2020-07-02, lijiang <lijiang@...hat.com> wrote:
> About the VMCOREINFO part, I made some tests based on the kernel patch
> v3, the makedumpfile and crash-utility can work as expected with your
> patch(userspace patch), but, unfortunately, the vmcore-dmesg(kexec-tools)
> can't correctly read the printk ring buffer information, and get the
> following error:
>
> "Missing the log_buf symbol"
>
> The kexec-tools(vmcore-dmesg) should also have a similar patch, just like
> in the makedumpfile and crash-utility.

Yes, a patch for this is needed (as well as for any other related
software floating around the internet).

I have no RFC patches for vmcore-dmesg. Looking at the code, I think it
would be quite straight forward to port the makedumpfile patch. I will
try to make some time for this.

I do not want to patch any other software for this. I think with 3
examples (crash, makedumpfile, vmcore-dmesg), others should be able to
implement the changes to their software without needing my help.

John Ogness