linux-kernel - Re: [PATCH 00/10] AXFS: Advanced XIP filesystem

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <48ADFE65.1050007@snapgear.com>
Date:	Fri, 22 Aug 2008 09:46:45 +1000
From:	Greg Ungerer <gerg@...pgear.com>
To:	Jamie Lokier <jamie@...reable.org>
CC:	Jared Hulbert <jaredeh@...il.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, cotte@...ibm.com, nickpiggin@...oo.com.au
Subject: Re: [PATCH 00/10] AXFS: Advanced XIP filesystem


Jamie Lokier wrote:
> Jared Hulbert wrote:
>> The biggest improvement is in the way AXFS allows for each page to be XIP or
>> not.  First, a user collects information about which pages are accessed on a
>> compressed image for each mmap()ed region from /proc/axfs/volume0.  That
>> 'profile' is used as an input to the image builder.  The resulting image has
>> only the relevant pages uncompressed and XIP.  The result is smaller memory
>> sizes and faster launches.
> 
> Sounds great, really nice idea.
> 
> How does it fare with no MMU?  Can the profiler and image builder lay
> out the XIP pages in such a way that no-MMU mmaps can map those regions?

The key for XIP on noMMU would be the ability to store a
file as one complete contiguous chunk. Can AXFS do this?

Regards
Greg



------------------------------------------------------------------------
Greg Ungerer  --  Chief Software Dude       EMAIL:     gerg@...pgear.com
Secure Computing Corporation                PHONE:       +61 7 3435 2888
825 Stanley St,                             FAX:         +61 7 3891 3630
Woolloongabba, QLD, 4102, Australia         WEB: http://www.SnapGear.com
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/