linux-kernel - Re: [PATCH-v2] kdump: Enable kdump if 2nd-kernel is loaded.

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Date:	Mon, 13 Jul 2009 10:06:25 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"Ken'ichi Ohmichi" <oomichi@....nes.nec.co.jp>
Cc:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	kexec-ml <kexec@...ts.infradead.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Simon Horman <horms@...ge.net.au>
Subject: Re: [PATCH-v2] kdump: Enable kdump if 2nd-kernel is loaded.

"Ken'ichi Ohmichi" <oomichi@....nes.nec.co.jp> writes:

> Hi,
>
> This patch is a new version by Seto-san's comment.
>
>
> Changelog since v1:
> * Remove the check code other than kexec_crash_image from kexec_should_crash()
>   because a kexec cannot crash if there is no image.
>
>
> This patch enables a kdump if 2nd-kernel is loaded.
> (The patch is based on linux-2.6.31-rc2.)
>
> Now, a kdump on oops is enabled if a kernel parameter "oops=panic"
> is specified and 2nd-kernel is loaded. I think that a kdump should
> be enabled regardless of "oops=panic" if 2nd-kernel is loaded,
> because a system administrator loads 2nd-kernel for enabling a kdump.

The Documentation for sysrq-c certainly needs to be updated.

If I am doing development on a system I like oops's.  All of the
information and nothing goes down.  I can get at /proc/kcore etc.

In a setting where I can't be Johnny on the spot and look at
things a core dump is probably the best I can get.  In that scenario
panic_on_oops sounds good.

As I read the current check it reads:
If we are going to panic and not oops || panic_on_oops
	kexec_should_crash = true;

Which seems a very reasonable implementation of policy.

Eric
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