Re: [PATCHv4 06/13] acpi/hmat: Register processor domain to its memory

From: Dan Williams
Date: Thu Jan 17 2019 - 12:01:41 EST

On Thu, Jan 17, 2019 at 4:11 AM Rafael J. Wysocki <rafael@xxxxxxxxxx> wrote:
> On Wed, Jan 16, 2019 at 6:59 PM Keith Busch <keith.busch@xxxxxxxxx> wrote:
> >
> > If the HMAT Subsystem Address Range provides a valid processor proximity
> > domain for a memory domain, or a processor domain with the highest
> > performing access exists, register the memory target with that initiator
> > so this relationship will be visible under the node's sysfs directory.
> >
> > Since HMAT requires valid address ranges have an equivalent SRAT entry,
> > verify each memory target satisfies this requirement.
> What exactly will happen after this patch?
> There will be some new directories under
> /sys/devices/system/node/nodeX/ if all goes well. Anything else?

When / if the memory randomization series [1] makes its way upstream
there will be a follow-on patch to enable that randomization based on
the presence of a memory-side cache published in the HMAT.