AXFS DOWNLOAD

One would ordinarily consider compressed storage and XIP to be mutually exclusive - there is little value in mapping compressed executable code into a process's address space. Why XIP doesn't get so much use with Linux What AXFS does provide is compressed storage using zlib. On mid nov , the project svn archive contained patches for 2. By Jonathan Corbet August 26, Using this data, it is possible to generate an AXFS filesystem image with an optimal number of compressed pages for the target system. AXFS has been designed from the beginning to facilitate XIP operation - that's its reason for existence and the origin of the "X" in its name.

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For such devices, a compressed filesystem can be built using the provided tools, then loaded into a minimal amount of flash on each axxfs. Some filesystems have a great deal of code dedicated to the creation of the optimal layout of file blocks on disk; AXFS has none of that.

Views Read View xafs View history. Navigation menu Personal tools Log in Request account. One would ordinarily consider compressed storage and XIP to be mutually exclusive - there is little value in mapping compressed executable code into a process's address space.

AXFS: a compressed, execute-in-place filesystem

AXFS has been designed from the beginning to facilitate XIP operation - that's its reason for existence and the origin of the "X" in its name. You only shift the reading from program execution to mounting.

One interesting aspect of compressed, flash-oriented filesystems is their apparent ability asfs stay out of the mainline kernel. Reading that file then yields spreadsheet-like output showing, for each file, how many times each page was faulted into the page cache. Beyond that, though, there is the simple fact that there is no single filesystem which is optimal for all applications.

Any place you see microcontrollers in use, it's likely you're talking about System-On-Chip processors with integrated azfs used axts program memory. Of course there can be a small saving since no in-memory copying is needed.

Trying to determine this information and manually pick the representation of adfs page seems like an error-prone exercise - not to mention one which would tend to create high employee turnover. There are places where XIP matters a lot, though many of them don't run Linux. Again this need to be benchmarked. By Jonathan Corbet August 26, Filesystems are clearly an area of high development interest at the moment; hardly a week goes by without a new filesystem release for Linux popping up on some axs or other.

So you don't want XIP for frequently-used code. Posted Sep 8, When running programs stored on that flash, copying pages of executable code from flash into main memory seems like a bit of a waste: It is Beta quality as of July All of azfs development is motivated by a number of factors, including the increasing size of storage devices and the increasing capability of solid-state storage.

In that case the XIP data is loaded during mounting. There is an additional twist, though. Alternatively it is possible to put the generated image in NAND. This project was started by engineers working at Intel.

Why XIP doesn't get so much use with Linux Posted Sep 5, 0: Effectively this does not gain much. A technical reason why XIP isn't as interesting lately include that the afxs times hurt It might be possible that this gives some gain as the boot loader might have less overhead reading a file than linux has. Linux has had an execute in place mechanism for a few years now, but relatively few filesystems make use of it.

AXFS: a compressed, execute-in-place filesystem []

The recently-announced AXFS xafs is a clear example of what can be done if one targets a specific use case and optimizes for that case only.

Filesystems normally need a few rounds of review before they can make it into the mainline; some filesystems need rather more than that.

Of course if you know that this is the case you can exclude this page from XIP. So another method is needed.

What AXFS does provide is compressed storage using zlib. The advantage over existing solutions is that it can provide reduced RAM with less flash because it is possible to compress only those pages that contribute to RAM savings.