Re: [RFC PATCH 0/3] Add Support for Multiple DC Regions

[Ira Weiny <ira.weiny@intel.com>]

anisa.su887@ wrote:
> From: Anisa Su <anisa.su@samsung.com>
> 
> This patchset introduces support for multiple DC regions. It is rebased on top
> of the latest branch published to Ira's repository:
> https://github.com/weiny2/linux-kernel/tree/dcd-v6-2025-09-23.
> We hope it will be useful in the meantime for others and restart some
> discussion around how to move DCD forward.

FWIW it seems patch 1/3 and this patch are both bug fixes to the DCD
series I last posted.  If so they should be tacked onto that series.

So, you are more that welcome to take over DCD development.

However, I had multiple DC partitions (Regions) supported in previous
versions of that series and the community decided that there was no use
case for such a device.  Based on this submission it seems that me ripping
out the multiple partitions was incorrect.

> 
> The corresponding NDCTL support can be found on this branch:
> https://github.com/anisa-su993/anisa-ndctl/tree/multiple-dc-region-support.
> I will reply to this thread with a reference to the thread for the
> NDCTL patches once published.
> 
> Testing:
> This patchset was tested on a QEMU VM with the following topology:

Unfortunately none of the details presented in this cover letter really
show why the kernel needs this additional complexity.

Can you go into more details on the use cases of multiple partitions?

Also, did you consider to use previous versions of my series?  Perhaps v8?

	https://lore.kernel.org/all/20241210-dcd-type2-upstream-v8-0-812852504400@intel.com/#r

Thanks,
Ira

[snip]