linux-kernel - Re: [PATCH 0/3] vmcoreinfo support for dump filtering

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Message-Id: <20070903171508oomichi@mail.jp.nec.com>
Date:	Mon, 3 Sep 2007 17:15:08 +0900
From:	"Ken'ichi Ohmichi" <oomichi@....nes.nec.co.jp>
To:	kexec-ml <kexec@...ts.infradead.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Neil Horman <nhorman@...hat.com>,
	Vivek Goyal <vgoyal@...ibm.com>,
	Bernhard Walle <bwalle@...e.de>,
	Don Zickus <dzickus@...hat.com>, Dan Aloni <da-x@...atomic.org>
Subject: Re: [PATCH 0/3] vmcoreinfo support for dump filtering


Hi,

2007/08/22 21:08:38 +0900, Ken'ichi Ohmichi <oomichi@....nes.nec.co.jp> wrote:
>
>Hi Andrew,
>
>This patch set frees the restriction that makedumpfile users should
>install a vmlinux file (including the debugging information) into
>each system.
>
>makedumpfile command is the dump filtering feature for kdump.
>It creates a small dumpfile by filtering unnecessary pages for the
>analysis. To distinguish unnecessary pages, it needs a vmlinux file
>including the debugging information. These days, the debugging package
>becomes a huge file, and it is hard to install it into each system.
>
>To solve the problem, kdump developers discussed it at lkml and kexec-ml.
>As the result, we reached the conclusion that necessary information
>for dump filtering (called "vmcoreinfo") should be embedded into the
>first kernel file and it should be accessed through /proc/vmcore
>during the second kernel.
>(http://www.uwsg.iu.edu/hypermail/linux/kernel/0707.0/1806.html) 
>
>Dan Aloni created the patch set for the above implementation.
>(http://www.uwsg.iu.edu/hypermail/linux/kernel/0707.1/1053.html)
>
>And I updated it for multi architectures and memory models.
>(http://lists.infradead.org/pipermail/kexec/2007-August/000479.html)
>
>
>PATCH SET:
>[1/3] [linux] Add vmcoreinfo
>  The patch is for linux-2.6.22.
>  The patch adds the vmcoreinfo data. Its address and size are output
>  to /sys/kernel/vmcoreinfo.

The patch for linux (add-vmcoreinfo.patch) is included in 2.6.23-rc4-mm1.
http://www.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.23-rc4/2.6.23-rc4-mm1/announce.txt

Thank you for your cooperation.


>[2/3] [kexec-tools] Pass vmcoreinfo's address and size
>  The patch is for kexec-tools-testing-20070330.
>  (http://www.kernel.org/pub/linux/kernel/people/horms/kexec-tools/)
>  kexec command gets the address and size of the vmcoreinfo data from
>  /sys/kernel/vmcoreinfo, and passes them to the second kernel through
>  ELF header of /proc/vmcore. When the second kernel is booting, the
>  kernel gets them from the ELF header and creates vmcoreinfo's PT_NOTE
>  segment into /proc/vmcore.

Horms, could you please merge the above patch ?


>[3/3] [makedumpfile] Extract vmcoreinfo from /proc/vmcore
>  The patch is for makedumpfile v1.1.6.
>  (https://sourceforge.net/projects/makedumpfile/)
>  makedumpfile command extracts the vmcoreinfo data from /proc/vmcore
>  and uses it for dump filtering.

I will release the next makedumpfile with the above patch.


Thanks
Ken'ichi Ohmichi
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