DAX enabled. Warning: EXPERIMENTAL, use at your own risk

DAX enabled. Warning: EXPERIMENTAL, use at your own risk

[Soccer Liu]

 
Hi:
During my debugging, I kept seeing this message from the DAX enabled mount operation.

[    0.757990] EXT4-fs (pmem0): DAX enabled. Warning: EXPERIMENTAL, use at your own risk

I am wondering how far this DAX feature is still away from becoming a "non-experimental" feature. (Another way of asking my questions: are there any major issues that's blocking it?)
Any idea?
ThanksCheng-mean
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Re: DAX enabled. Warning: EXPERIMENTAL, use at your own risk

[Ross Zwisler]

On Wed, Sep 13, 2017 at 06:26:10PM +0000, Soccer Liu wrote:
>  
> Hi:
> During my debugging, I kept seeing this message from the DAX enabled mount
> operation.
> 
> [    0.757990] EXT4-fs (pmem0): DAX enabled. Warning: EXPERIMENTAL, use at your own risk
> 
> I am wondering how far this DAX feature is still away from becoming a
> "non-experimental" feature. (Another way of asking my questions: are there
> any major issues that's blocking it?)

We talked about this a bit as a group during my LSF/MM talk this year:

https://lwn.net/Articles/717953/

Essentially the consensus was that we need to make the XFS and ext4 mount
options consistent and get reflink + DAX in a better state.  We also probably
figure out the per-DAX inode issues that have recently been under discussion:

https://lkml.org/lkml/2017/9/6/529

There will always be work to do, but I think those are the things that are
standing between us and removing the EXPERIMENTAL warning.
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