linux-kernel - Re: [PATCH 05/10] AXFS: axfs

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Message-Id: <200808222237.20346.arnd@arndb.de>
Date:	Fri, 22 Aug 2008 22:37:19 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	"Jared Hulbert" <jaredeh@...il.com>
Cc:	"David Woodhouse" <dwmw2@...radead.org>, carsteno@...ibm.com,
	Linux-kernel@...r.kernel.org, linux-embedded@...r.kernel.org,
	linux-mtd <linux-mtd@...ts.infradead.org>,
	"Jörn Engel" <joern@...fs.org>,
	tim.bird@...sony.com, nickpiggin@...oo.com.au
Subject: Re: [PATCH 05/10] AXFS: axfs_profiling.c

On Thursday 21 August 2008, Jared Hulbert wrote:
> 1) same mount point -
> I don't see how this works without an ioctl.  I can't just make up
> files in my mounted filesystem.   You expect the mounted version to
> match input to the mkfs.  I'd not be happy with an ioctl.  You can
> just read it.
> 
> 2) sysfs -
> I agree with Carsten, I don't see how this fits in the sysfs hierarchy.
> 
> 3) debugfs -
> I don't know diddly about this.

Ok, so now yet another suggestion, which may sound a little strange:

oprofilefs

I believe you can use the oprofile infrastructure to record data
about file accesses, even independent of the file system you
are looking at.

It's probably a lot of work to get it right, but I would be worth it.

	Arnd <><
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