linux-kernel - Re: [PATCH v6 00/22] Support ext4 on NV-DIMMs

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Message-ID: <20140302082159.GA27716@amd.pavel.ucw.cz>
Date:	Sun, 2 Mar 2014 09:22:00 +0100
From:	Pavel Machek <pavel@....cz>
To:	Matthew Wilcox <matthew.r.wilcox@...el.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org, willy@...ux.intel.com
Subject: Re: [PATCH v6 00/22] Support ext4 on NV-DIMMs

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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