linux-kernel - RE: [PATCH 1/2 v2] kdump: add the vmcoreinfo documentation

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Message-ID: <4AE2DC15AC0B8543882A74EA0D43DBEC0356426E@BPXM09GP.gisp.nec.co.jp>
Date:   Wed, 5 Dec 2018 20:29:14 +0000
From:   Kazuhito Hagio <k-hagio@...jp.nec.com>
To:     lijiang <lijiang@...hat.com>, Borislav Petkov <bp@...en8.de>
CC:     "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "bhe@...hat.com" <bhe@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        "x86@...nel.org" <x86@...nel.org>,
        "kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "dyoung@...hat.com" <dyoung@...hat.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: RE: [PATCH 1/2 v2] kdump: add the vmcoreinfo documentation

> >> Generating VMCOREINFO is easy in the first kernel, for example:
> >> # makedumpfile -g VMCOREINFO -x vmlinux
> >
> > I get:
> >
> > $ makedumpfile -g VMCOREINFO -x vmlinux
> > The kernel version is not supported.
> > The makedumpfile operation may be incomplete.
> >
> > The vmcoreinfo is saved to VMCOREINFO.
> >
> > makedumpfile Completed.
> >
> > But the text file looks ok AFAICT. Please add that command to the
> > documentation file.
> >

Please note that this VMCOREINFO is generated from the information in
the vmlinux only, not from the running kernel and /proc/kcore. So if
we add a command to dump it from running kernel, it's not suitable.

(This switch is intended to make a data that is used instead of vmlinux
 when vmcore didn't have VMCOREINFO and makedumpfile is in a situation
 that we don't have vmlinux. Please see the explanation of the -i and
 -g options in makefumpfile(8).)

makedumpfile doesn't have any switch which dumps VMCOREINFO from kcore
for now. (I'm thinking to have makedumpfile dump it as debug message,
though.)

Thanks,
Kazu