linux-ext4 - Re: [PATCH 2/3] ext4: Context support

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Date:	Tue, 12 Jun 2012 16:41:28 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Arnd Bergmann <arnd.bergmann@...aro.org>
Cc:	Saugata Das <saugata.das@...aro.org>,
	Artem Bityutskiy <dedekind1@...il.com>,
	Saugata Das <saugata.das@...ricsson.com>,
	linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-mmc@...r.kernel.org, patches@...aro.org, venkat@...aro.org
Subject: Re: [PATCH 2/3] ext4: Context support

On Tue, Jun 12, 2012 at 08:07:28PM +0000, Arnd Bergmann wrote:
> Right. The danger here is that the context support was described in
> the standard first, while none of the devices seem to even be
> smart enough to make use of the information we put in there. Once
> operating systems start putting some data in there, at least
> some manufacturers will start making use of that data to optimize
> the accesses, but it's very unlikely that they will tell us exactly
> what they are doing. Having code in ext4 that uses the contexts will
> at least make it more likely that the firmware optimizations are
> based on ext4 measurements rather than some other file system or
> operating system.
>
> From talking with the emmc device vendors, I can tell you that ext4
> is very high on the list of file systems to optimize for, because
> they all target Android products.

Well, I have a contact at SanDisk where I can discuss things under
NDA, if that will help.  He had reached out to me specifically because
of ext4 and Android --- he's the guy that I invited to give a talk at
the LSF workshop last year.

					- Ted
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