[dm-devel] [PATCH v2 0/4] brd: implement discard

[Mikulas Patocka]

On Wed, 28 Sep 2022, Gao Xiang wrote:

> > Hi
> > 
> > Ramdisk DAX was there in the past, but it was removed in the kernel 4.15.
> 
> Hi Mikulas!
> 
> Thanks for pointing out! I didn't realize that, although I think if we really
> use brd driver in production, enabling DAX support for brd is much better to
> remove double caching so that ramdisk can become a real ramdisk for most
> regular files.
> 
> I have no idea how other people think about ramdisk DAX, or brd is just a
> stuff for testing only now.  If it behaves like this, sorry about the
> noise.
> 
> Thanks,
> Gao Xiang

Hi

See the message for the commit 7a862fbbdec665190c5ef298c0c6ec9f3915cf45 
for the reason why it was removed.

Mikulas