linux-kernel - Re: [PATCH] panic.c: export panic_on

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Date:	Mon, 12 Oct 2009 13:15:48 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Simon Kagstrom <simon.kagstrom@...insight.net>,
	Artem Bityutskiy <dedekind1@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Koskinen Aaro (Nokia-D/Helsinki)" <aaro.koskinen@...ia.com>,
	linux-mtd <linux-mtd@...ts.infradead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] panic.c: export panic_on_oops

On Mon, 2009-10-12 at 14:09 +0200, Ingo Molnar wrote:
> Also, would it be possible to just simplify the thing and not do any 
> buffering at all? Extra buffering complexity in a console driver is only 
> asking for trouble. Or is flash storage write cycles optimization that 
> important in this case?

That and the fact that on NAND flash you have to write full pages at a
time -- that's 512 bytes, 2KiB or 4KiB depending on the type of chip. So
we really do want to buffer it where we can.

We don't want to write a 2KiB page for every line of printk output.

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation

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