AXFS (Advanced XIP Filesystem) is acompressedread-onlyfile system forLinux, initially developed atIntel, and now maintained atNumonyx. It was designed to useexecute in place (XIP) alongside compression aiming to reduceboot and program load times, while retaining a smallmemory footprint forembedded devices. This is achieved by mixing compressed and uncompressedpages in the same executable file.^[1] AXFS isfree software licensed under theGPL.

Cramfs is another read-onlycompressed file system that supports XIP (with patches); however, it uses a strategy of decompressing entire files, whereas AXFS supports XIP with page granularity.^[2]

• Squashfs is another read-only compressed file system
• Cloop is a compressedloopback device module for theLinux kernel
• e2compr provides compression forext2
• List of file systems
• Comparison of file systems

• Tony Benavides, Justin Treon, Jared Hulbert and Weide Chang,The Enabling of an Execute-In-Place Architecture to Reduce the Embedded System Memory Footprint and Boot Time, Journal of Computers, Vol. 3, No. 1, Jan 2008, pp. 79–89
• Jared Hulbert,Introducing the Advanced XIP File SystemArchived 2012-01-13 at theWayback Machine, (talk) Proceedings of the 2008Linux Symposium

• AXFS website
• Justin Treon (February 14, 2008)Side by side comparison of launching applications stored in the AXFS, SquashFS, CRAMFS and JFFS2 read-only filing systems. (video)
• "Application eXecute-In-Place (XIP) with Linux and AXFS"

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