linux-kernel - Re: [PATCH/RFC v5 4/5]: core: Add dump device to call on oopses and panics

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Message-ID: <20091130095451.GA15335@logfs.org>
Date:	Mon, 30 Nov 2009 10:54:51 +0100
From:	Jörn Engel <joern@...fs.org>
To:	Artem Bityutskiy <dedekind1@...il.com>
Cc:	Simon Kagstrom <simon.kagstrom@...insight.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-mtd <linux-mtd@...ts.infradead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Koskinen Aaro (Nokia-D/Helsinki)" <aaro.koskinen@...ia.com>,
	Ingo Molnar <mingo@...e.hu>,
	David Woodhouse <dwmw2@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH/RFC v5 4/5]: core: Add dump device to call on oopses and panics

On Mon, 30 November 2009 11:40:55 +0200, Artem Bityutskiy wrote:
> 
> The other alternative I was thinking about was to introduce a boolean
> flag, and set it to one as soon as 'lon_end' becomes larger than
> 'log_buf_len'.

I've thought about that as well.  The drawback is that we would have to
check in the regular printk path - by the time the panic notifier is
running it is too late.  So it adds cost to the regular case.

Jörn

-- 
There are three principal ways to lose money: wine, women, and engineers.
While the first two are more pleasant, the third is by far the more certain.
-- Baron Rothschild
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