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From: John Ogness <john.ogness@linutronix.de>
To: lijiang <lijiang@redhat.com>, Petr Mladek <pmladek@suse.com>
Cc: Andrea Parri <parri.andrea@gmail.com>,
	Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>,
	Paul McKenney <paulmck@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
	Steven Rostedt <rostedt@goodmis.org>,
	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH v3 3/3] printk: use the lockless ringbuffer
Date: Fri, 03 Jul 2020 14:00:47 +0206	[thread overview]
Message-ID: <87lfk0stiw.fsf@jogness.linutronix.de> (raw)
In-Reply-To: <585a6a1b-931c-1034-e2cc-da2c4381751e@redhat.com>

On 2020-07-02, lijiang <lijiang@redhat.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.

A patched kexec-tools is available here [0].

I did not test using 32-bit dumps on 64-bit machines and vice versa. But
it should work.

John Ogness

[0] https://github.com/Linutronix/kexec-tools.git (printk branch)

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WARNING: multiple messages have this Message-ID (diff)
From: John Ogness <john.ogness@linutronix.de>
To: lijiang <lijiang@redhat.com>, Petr Mladek <pmladek@suse.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
	Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>,
	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Andrea Parri <parri.andrea@gmail.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Paul McKenney <paulmck@kernel.org>,
	kexec@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 3/3] printk: use the lockless ringbuffer
Date: Fri, 03 Jul 2020 14:00:47 +0206	[thread overview]
Message-ID: <87lfk0stiw.fsf@jogness.linutronix.de> (raw)
In-Reply-To: <585a6a1b-931c-1034-e2cc-da2c4381751e@redhat.com>

On 2020-07-02, lijiang <lijiang@redhat.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.

A patched kexec-tools is available here [0].

I did not test using 32-bit dumps on 64-bit machines and vice versa. But
it should work.

John Ogness

[0] https://github.com/Linutronix/kexec-tools.git (printk branch)

  parent reply	other threads:[~2020-07-03 11:54 UTC|newest]

Thread overview: 74+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-18 14:49 [PATCH v3 0/3] printk: replace ringbuffer John Ogness
2020-06-18 14:49 ` John Ogness
2020-06-18 14:49 ` [PATCH v3 1/3] crash: add VMCOREINFO macro to define offset in a struct declared by typedef John Ogness
2020-06-18 14:49   ` John Ogness
2020-06-24  8:49   ` Petr Mladek
2020-06-24  8:49     ` Petr Mladek
2020-07-04  9:30   ` Baoquan He
2020-07-04  9:30     ` Baoquan He
2020-06-18 14:49 ` [PATCH v3 2/3] printk: add lockless ringbuffer John Ogness
2020-06-18 14:49   ` John Ogness
2020-06-29 15:32   ` Paul E. McKenney
2020-06-29 15:32     ` Paul E. McKenney
2020-07-02  8:35   ` Petr Mladek
2020-07-02  8:35     ` Petr Mladek
2020-06-18 14:49 ` [PATCH v3 3/3] printk: use the " John Ogness
2020-06-18 14:49   ` John Ogness
2020-06-18 18:23   ` kernel test robot
2020-06-18 18:23     ` kernel test robot
2020-06-18 18:23     ` kernel test robot
2020-06-18 18:23   ` [RFC PATCH] printk: _printk_rb_static_dict can be static kernel test robot
2020-06-18 18:23     ` kernel test robot
2020-06-18 18:23     ` kernel test robot
2020-06-19  6:49     ` John Ogness
2020-06-19  6:49       ` John Ogness
2020-06-19  6:49       ` John Ogness
2020-06-19 12:29       ` Steven Rostedt
2020-06-19 12:29         ` Steven Rostedt
2020-06-19 12:29         ` Steven Rostedt
2020-06-25  8:16   ` truncate dict: was: Re: [PATCH v3 3/3] printk: use the lockless ringbuffer Petr Mladek
2020-06-25  8:16     ` Petr Mladek
2020-06-26 13:48     ` John Ogness
2020-06-26 13:48       ` John Ogness
2020-06-25  8:28   ` buffer allocation: was: " Petr Mladek
2020-06-25  8:28     ` Petr Mladek
2020-06-26 15:02     ` John Ogness
2020-06-26 15:02       ` John Ogness
2020-06-29 14:04       ` Petr Mladek
2020-06-29 14:04         ` Petr Mladek
2020-06-29 21:57         ` John Ogness
2020-06-29 21:57           ` John Ogness
2020-07-02 13:27           ` Petr Mladek
2020-07-02 13:27             ` Petr Mladek
2020-06-25 12:09   ` record_printk_text tricks: " Petr Mladek
2020-06-25 12:09     ` Petr Mladek
2020-06-25 15:25     ` Petr Mladek
2020-06-25 15:25       ` Petr Mladek
2020-06-26 23:25     ` John Ogness
2020-06-26 23:25       ` John Ogness
2020-06-25 15:17   ` pending output optimization: " Petr Mladek
2020-06-25 15:17     ` Petr Mladek
2020-07-01 19:58     ` John Ogness
2020-07-01 19:58       ` John Ogness
2020-06-25 15:20   ` syslog size unread: " Petr Mladek
2020-06-25 15:20     ` Petr Mladek
2020-06-29 21:51     ` John Ogness
2020-06-29 21:51       ` John Ogness
2020-07-02  8:25   ` lijiang
2020-07-02  8:25     ` lijiang
2020-07-02  9:02     ` John Ogness
2020-07-02  9:02       ` John Ogness
2020-07-02  9:43       ` lijiang
2020-07-02  9:43         ` lijiang
2020-07-02 13:31         ` Petr Mladek
2020-07-02 13:31           ` Petr Mladek
2020-07-04  1:12           ` lijiang
2020-07-04  1:12             ` lijiang
2020-07-03 11:54         ` John Ogness [this message]
2020-07-03 11:54           ` John Ogness
2020-07-08  5:50           ` lijiang
2020-07-08  5:50             ` lijiang
2020-06-25  7:19 ` [PATCH v3 0/3] printk: replace ringbuffer Dave Young
2020-06-25  7:19   ` Dave Young
2020-06-25 14:13   ` John Ogness
2020-06-25 14:13     ` John Ogness

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