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 for <Linux-nvdimm@lists.01.org>; Wed, 13 Sep 2017 12:47:35 -0700 (PDT)
Date: Wed, 13 Sep 2017 13:50:26 -0600
From: Ross Zwisler <ross.zwisler@linux.intel.com>
Subject: Re: DAX enabled. Warning: EXPERIMENTAL, use at your own risk
Message-ID: <20170913195026.GA26069@linux.intel.com>
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To: Soccer Liu <soccer_liu@yahoo.com>
Cc: "Linux-nvdimm@lists.01.org" <Linux-nvdimm@lists.01.org>
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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.
> =

> [=A0=A0=A0 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.=A0(Another way of asking my questions: are th=
ere
> 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 probab=
ly
figure out the per-DAX inode issues that have recently been under discussio=
n:

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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