linux-kernel - Re: [RFC PATCH 0/10] Another Approach to Use PMEM as NUMA Node

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Message-ID: <CAPcyv4imk02wme0PsY0rUePax8SOq2-=+objYT-x4bxthLkKkQ@mail.gmail.com>
Date:   Mon, 25 Mar 2019 16:37:07 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Brice Goglin <Brice.Goglin@...ia.fr>
Cc:     Yang Shi <yang.shi@...ux.alibaba.com>,
        Michal Hocko <mhocko@...e.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Rik van Riel <riel@...riel.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Keith Busch <keith.busch@...el.com>,
        Fengguang Wu <fengguang.wu@...el.com>,
        "Du, Fan" <fan.du@...el.com>, "Huang, Ying" <ying.huang@...el.com>,
        Linux MM <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 0/10] Another Approach to Use PMEM as NUMA Node

On Mon, Mar 25, 2019 at 4:09 PM Brice Goglin <Brice.Goglin@...ia.fr> wrote:
>
>
> Le 25/03/2019 à 20:29, Dan Williams a écrit :
> > Perhaps "path" might be a suitable replacement identifier rather than
> > type. I.e. memory that originates from an ACPI.NFIT root device is
> > likely "pmem".
>
>
> Could work.
>
> What kind of "path" would we get for other types of memory? (DDR,
> non-ACPI-based based PMEM if any, NVMe PMR?)

I think for memory that is described by the HMAT "Reservation hint",
and no other ACPI table, it would need to have "HMAT" in the path. For
anything not ACPI it gets easier because the path can be the parent
PCI device.