linux-kernel - Re: [RFC PATCH v3 0/8] mm,numa: N_PRIVATE node isolation for device-managed memory

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Message-ID: <aWWuU8xphCP_g6KI@gourry-fedora-PF4VCD3F>
Date: Mon, 12 Jan 2026 21:30:43 -0500
From: Gregory Price <gourry@...rry.net>
To: dan.j.williams@...el.com
Cc: Balbir Singh <balbirs@...dia.com>, Yury Norov <ynorov@...dia.com>,
	linux-mm@...ck.org, cgroups@...r.kernel.org,
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Subject: Re: [RFC PATCH v3 0/8] mm,numa: N_PRIVATE node isolation for
 device-managed memory

On Mon, Jan 12, 2026 at 05:17:53PM -0800, dan.j.williams@...el.com wrote:
> 
> I think what Balbir is saying is that the _PUBLIC is implied and can be
> omitted. It is true that N_MEMORY[_PUBLIC] already indicates multi-zone
> support. So N_MEMORY_PRIVATE makes sense to me as something that it is
> distinct from N_{HIGH,NORMAL}_MEMORY which are subsets of N_MEMORY.
> Distinct to prompt "go read the documentation to figure out why this
> thing looks not like the others".

Ah, ack.  Will update for v4 once i give some thought to the compression
stuff and the cgroups notes.

I would love if the ZONE_DEVICE folks could also chime in on whether the
callback structures for pgmap and hmm might be re-usable here, but might
take a few more versions to get the attention of everyone.

~Gregory