linux-kernel - Re: [PATCH 00/22 take 3] UBI: Unsorted Block Images

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Message-Id: <1174477018.17249.197.camel@sauron>
Date:	Wed, 21 Mar 2007 13:36:58 +0200
From:	Artem Bityutskiy <dedekind@...radead.org>
To:	tglx@...utronix.de
Cc:	Jörn Engel <joern@...ybastard.org>,
	Matt Mackall <mpm@...enic.com>,
	Josh Boyer <jwboyer@...ux.vnet.ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Frank Haverkamp <haver@...t.ibm.com>,
	Christoph Hellwig <hch@...radead.org>,
	David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH 00/22 take 3] UBI: Unsorted Block Images

On Wed, 2007-03-21 at 12:25 +0100, Thomas Gleixner wrote:
> Last time I talked to you about that, you said it would be possible and
> fixable. We talked about several mechanisms, which would allow a
> filesystem or other users to hint such things to UBI.
> 
> Even if the LogFS wear levelling is so superior, it CAN'T do across
> device wear levelling.

Exactly. Although it is true that it cannot be _as good_ as FS, one can
optimize this by means of asking FS beforehand and make it quite OK. And
eraseblock movement is not so frequent event - we do it only once the
erase counter difference is more then 4Ki (although it is tunable).

-- 
Best regards,
Artem Bityutskiy (Битюцкий Артём)

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