linux-kernel - Re: [PATCH v3 00/21] kdump, vmcore: support mmap() on /proc/vmcore

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Message-ID: <87d2utxlzw.fsf@xmission.com>
Date:	Thu, 21 Mar 2013 00:14:43 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	HATAYAMA Daisuke <d.hatayama@...fujitsu.com>
Cc:	akpm@...ux-foundation.org, vgoyal@...hat.com, cpw@....com,
	kumagai-atsushi@....nes.nec.co.jp, lisa.mitchell@...com,
	heiko.carstens@...ibm.com, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org, zhangyanfei@...fujitsu.com
Subject: Re: [PATCH v3 00/21] kdump, vmcore: support mmap() on /proc/vmcore

HATAYAMA Daisuke <d.hatayama@...fujitsu.com> writes:

> The breakage was caused by the introduction of new NT_VMCORE_PAD to
> "VMCOREINFO" name, except for which it worked fine. But it will be
> dropped in the next version. It'll be no problem for some time.
>
> The breakage was caused by makedumpfile itself due to the bug that it
> had so far seen note type only, not note name. It was possible to
> avoid the breakage by choosing another note name but I didn't do
> it. This topic will probably arise when some kind of new note types
> are needed.

Yes.  Not ignoring unknown note types is a a deficiency in makedumpfile.
And definitely not something to keep us from introducing new note types.

It should be noted that a common use of /proc/vmcore is to do:
cp /proc/vmcore /somepath/core

gdb /somepath/core

makedumpfile is just an optimization on that for people who want to
write a smaller file.

Eric
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