From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Jared Hulbert" <jaredeh@gmail.com>
Subject: Re: [PATCH 06/10] AXFS: axfs_super.c
Date: Thu, 21 Aug 2008 20:05:48 -0700
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References: <48AD0101.4020505@gmail.com> <48AE19AD.1020209@lougher.demon.co.uk>
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To: Phillip Lougher <phillip@lougher.demon.co.uk>
Cc: Linux-kernel@vger.kernel.org, linux-embedded@vger.kernel.org, linux-mtd <linux-mtd@lists.infradead.org>, =?UTF-8?Q?J=C3=B6rn_Engel?= <joern@logfs.org>, tim.bird@am.sony.com, cotte@de.ibm.com, nickpiggin@yahoo.com.au

> From this it would appear that if the region data can't be mapped XIP (i.e.
> it is compressed or on a block device), it is cached in its entirety in RAM?

That is correct.

> This implies for block devices that the entire filesystem metadata has to be
> cached in RAM.  This severely limits the size of AXFS filesystems when using
> block devices, or the else memory usage will be excessive.

This is where 64bit squashfs could be a better fit.