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

On Tue, Sep 20, 2022 at 01:52:38PM -0400, Mikulas Patocka wrote:

Hi

Here I'm sending second version of the brd discard patches.

That is quite interesting.

btw, something out of topic, I once had some preliminary attempt
to add DAX support to brd since brd works as ramdisk and brd-dax
could have the following benefits:

 - DAX can be tested without PMEM devices;
 - ramdisk fses can be accessed without double page cache;
 - initrd use cases then can work well without extra page cache
   and maybe it can perform better than initramfs (without unpack
   process).

I wrote some hack stuff but don't have more time working on it...
https://git.kernel.org/pub/scm/linux/kernel/git/xiang/linux.git/log/?h=erofs/initrd-fsdax

I'm not sure if others are interested in topic though.

It would be helpful to get rid of all brd page->index use cases
first.

Thanks,
Gao Xiang

Mikulas
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