linux-kernel - Re: [Patch 1/4][kernel][slimdump] Add new elf-note of type NT

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Message-ID: <20111005123102.GA509@gere.osrc.amd.com>
Date:	Wed, 5 Oct 2011 14:31:02 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Valdis.Kletnieks@...edu
Cc:	"K.Prasad" <prasad@...ux.vnet.ibm.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org, crash-utility@...hat.com,
	kexec@...ts.infradead.org, Vivek Goyal <vgoyal@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	"Luck, Tony" <tony.luck@...el.com>, anderson@...hat.com,
	tachibana@....nes.nec.co.jp, oomichi@....nes.nec.co.jp
Subject: Re: [Patch 1/4][kernel][slimdump] Add new elf-note of type
 NT_NOCOREDUMP to capture slimdump

On Wed, Oct 05, 2011 at 07:55:46AM -0400, Valdis.Kletnieks@...edu wrote:
> On Wed, 05 Oct 2011 09:31:11 +0200, Borislav Petkov said:
> > On Wed, Oct 05, 2011 at 12:37:28PM +0530, K.Prasad wrote:
> 
> > > True. Like stated by me earlier, there could be two possible outcomes
> > > from capturing memory dump in such cases - they're either dangerous or
> > > doesn't make sense.
> >
> > Why, in the second example the only corruption is to the L2 cache so
> > your memory image is intact. Why wouldn't you want to capture a memory
> > dump then? It is business as usual in that case.
> 
> I'll bite.  What's the use case for bothering to capture a memory dump when
> you're looking at an MCE that indicates L2 cache corruption?  What additional
> useful information could you possibly get from the dump?

This was just a hypothetical example to show that you need a more
finer-grained differentiation between fatal MCEs when deciding to dump
or not to dump :-) and not to unconditionally _not_ dump just because
we're going to panic.

-- 
Regards/Gruss,
Boris.
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