On Tue 2014-02-25 09:18:16, Matthew Wilcox wrote:
> One of the primary uses for NV-DIMMs is to expose them as a block device
> and use a filesystem to store files on the NV-DIMM. While that works,
> it currently wastes memory and CPU time buffering the files in the page
> cache. We have support in ext2 for bypassing the page cache, but it
> has some races which are unfixable in the current design. This series
> of patches rewrite the underlying support, and add support for direct
> access to ext4.
>
> This iteration of the patchset renames the "XIP" support to "DAX".
> This fixes the confusion between kernel XIP and filesystem XIP. It's not
> really about executing in-place; it's about direct access to memory-like
> storage, bypassing the page cache. DAX is TLA-compliant, retains the
> exciting X, is pronouncable ("Dacks") and is not used elsewhere in
> the kernel. The only major use of DAX outside the kernel is the German
> stock exchange, and I think that's pretty unlikely to cause
> confusion.
It is TLA compliant, but not widely understood, and probably not
googleable. Could we perhaps use some longer name for a while?
> create mode 100644 Documentation/filesystems/dax.txt
Its not like filename can't be longer than 3.3, you see?
Pavel
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