linux-kernel - Re: kdump/kexec vmcore size doubles each time

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Message-ID: <1343087299.65126.YahooMailNeo@web160606.mail.bf1.yahoo.com>
Date:	Mon, 23 Jul 2012 16:48:19 -0700 (PDT)
From:	joe shmoe <joeshmoeypeter@...oo.com>
To:	Daniel Kiper <dkiper@...-space.pl>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	daniel.kiper@...cle.com
Subject: Re: kdump/kexec vmcore size doubles each time

Hi,
Thank you for the reply. I ended up opting for writing to filesystem rather than raw_device and this seems to have helped me sidestep the problem for now. Unfortunately, I can't quite make a jump to later sources.

I do have another question, I see KDUMP_KEEP_OLD_DUMPS mentioned to automatically clean up prior dumps (for ex: http://dedoimedo.com/computers/kdump.html and other SUSE docs).
However, I cannot find any logic in sources to do this (and sure enough I don't see older cores in my /var/crash/ path clean up as new cores are dumped).

Could someone please comment if:
(i) KDUMP_KEEP_OLD_DUMPS is unsupported or not. If it IS supported, could someone please help with the relevant source code so I could debug why it isn't working? Yes, I did download kexec-tools git but cannot find anything relevant.

(ii) If there is NO explicit source code to achieve this -- then do folks achieve such a cleanup through KDUMP_PRE and KDUMP_POST scripts? If yes, is there a standard-ish script out there to achieve this?

Thanks much.

----- Original Message -----
From: Daniel Kiper <dkiper@...-space.pl>
To: joe shmoe <joeshmoeypeter@...oo.com>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>; daniel.kiper@...cle.com
Sent: Friday, July 20, 2012 2:36 AM
Subject: Re: kdump/kexec vmcore size doubles each time

On Thu, Jul 19, 2012 at 03:08:44PM -0700, joe shmoe wrote:
> Hi,
> I am trying to configure kexec/kdump on 2.6.35-14.
>
>
> $> kexec --version
> kexec-tools-testing 20080330 released 30th March 2007

[...]

It is very ancient version. Please use at least Ver. 2.0.3
(http://kernel.org/pub/linux/utils/kernel/kexec/) or current
development version (git://git.kernel.org/pub/scm/utils/kernel/kexec/kexec-tools.git).

Daniel

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