Re: [LSF/MM/BPF TOPIC][RFC PATCH v4 00/27] Private Memory Nodes (w/ Compressed RAM)

Gregory Price
2026-04-16T20:23:20Z

On Wed, Apr 15, 2026 at 12:47:50PM -0700, Frank van der Linden wrote:
> >
> > > I also have some questions about longterm pinnings, but that's better
> > > discussed in person :)
> > >
> >
> > The longterm pin extention came from auditing existing zone_device
> > filters.
> >
> > tl;dr: informative mechanism - but it probably should be dropped,
> > it makes no sense (it's device memory, pinnings mean nothing?).
> >
> >
... snip ... stitching together some context here
>
> So, looking at having some properties set at the node level makes
> sense to me even in the non-device case. But perhaps that is out of
> scope for the initial discussion.

I think there's an argument burried in this observation (useful for
non-device case) that suggests there could be a world where longterm
pinning on this memory makes sense.

But it doesn't need to be introduced from the start, and it's a 5-10
line change to add it in later, so I think it will get trimmed unless
there's a user out there actively experimenting with it.

~Gregory