linux-kernel - Re: [PATCH 0/2][concept RFC] x86: BIOS-save kernel log to disk upon panic

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Message-ID: <20110203175721.GB8785@elte.hu>
Date:	Thu, 3 Feb 2011 18:57:21 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Pavel Machek <pavel@....cz>, Tejun Heo <tj@...nel.org>,
	"Ahmed S. Darwish" <darwish.07@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, X86-ML <x86@...nel.org>,
	Tony Luck <tony.luck@...el.com>, Dave Jones <davej@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Randy Dunlap <rdunlap@...otime.net>,
	Willy Tarreau <wtarreau@...a.kernel.org>,
	Willy Tarreau <w@....eu>, Dirk Hohndel <hohndel@...radead.org>,
	Dirk.Hohndel@...el.com, IDE-ML <linux-ide@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Fr?d?ric Weisbecker <fweisbec@...il.com>,
	Borislav Petkov <bp@...en8.de>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [PATCH 0/2][concept RFC] x86: BIOS-save kernel log to disk upon
 panic


* H. Peter Anvin <hpa@...or.com> wrote:

> On 02/03/2011 06:36 AM, Pavel Machek wrote:
> > 
> > Could we read the log area, first, verify it contains signature, write
> > it back?
> > 								Pavel
> 
> Yes, but that doesn't guarantee no data corruption caused by handing
> over from one driver to another.

Waiting a few seconds? Is there any sufficiently high number of X where waiting X 
seconds would make it safe to touch the hardware? (i.e. it would guarantee that 
pending commands are flushed, etc.)

Thanks,

	Ingo
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